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Nementzik LR, Thumbadoo KM, Murray HC, Gordon D, Yang S, Blair IP, Turner C, Faull RLM, Curtis MA, McLean C, Nicholson GA, Swanson MEV, Scotter EL. Distribution of ubiquilin 2 and TDP-43 aggregates throughout the CNS in UBQLN2 p.T487I-linked amyotrophic lateral sclerosis and frontotemporal dementia. Brain Pathol 2024; 34:e13230. [PMID: 38115557 PMCID: PMC11007053 DOI: 10.1111/bpa.13230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 11/29/2023] [Indexed: 12/21/2023] Open
Abstract
Mutations in the UBQLN2 gene cause amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). The neuropathology of such UBQLN2-linked cases of ALS/FTD is characterised by aggregates of the ubiquilin 2 protein in addition to aggregates of the transactive response DNA-binding protein of 43 kDa (TDP-43). ALS and FTD without UBQLN2 mutations are also characterised by TDP-43 aggregates, that may or may not colocalise with wildtype ubiquilin 2. Despite this, the relative contributions of TDP-43 and ubiquilin 2 to disease pathogenesis remain largely under-characterised, as does their relative deposition as aggregates across the central nervous system (CNS). Here we conducted multiplex immunohistochemistry of three UBQLN2 p.T487I-linked ALS/FTD cases, three non-UBQLN2-linked (sporadic) ALS cases, and 8 non-neurodegenerative disease controls, covering 40 CNS regions. We then quantified ubiquilin 2 aggregates, TDP-43 aggregates and aggregates containing both proteins in regions of interest to determine how UBQLN2-linked and non-UBQLN2-linked proteinopathy differ. We find that ubiquilin 2 aggregates that are negative for TDP-43 are predominantly small and punctate and are abundant in the hippocampal formation, spinal cord, all tested regions of neocortex, medulla and substantia nigra in UBQLN2-linked ALS/FTD but not sporadic ALS. Curiously, the striatum harboured small punctate ubiquilin 2 aggregates in all cases examined, while large diffuse striatal ubiquilin 2 aggregates were specific to UBQLN2-linked ALS/FTD. Overall, ubiquilin 2 is mainly deposited in clinically unaffected regions throughout the CNS such that symptomology in UBQLN2-linked cases maps best to the aggregation of TDP-43.
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Affiliation(s)
- Laura R. Nementzik
- School of Biological SciencesUniversity of AucklandAucklandNew Zealand
- Centre for Brain ResearchUniversity of AucklandAucklandNew Zealand
| | - Kyrah M. Thumbadoo
- School of Biological SciencesUniversity of AucklandAucklandNew Zealand
- Centre for Brain ResearchUniversity of AucklandAucklandNew Zealand
| | - Helen C. Murray
- Centre for Brain ResearchUniversity of AucklandAucklandNew Zealand
- Department of Anatomy and Medical ImagingUniversity of AucklandAucklandNew Zealand
| | - David Gordon
- School of Biological SciencesUniversity of AucklandAucklandNew Zealand
- Centre for Brain ResearchUniversity of AucklandAucklandNew Zealand
| | - Shu Yang
- Centre for Motor Neuron Disease Research, Department of Biomedical Sciences, Faculty of Medicine, Health, and Human SciencesMacquarie UniversityNorth RydeNew South WalesAustralia
| | - Ian P. Blair
- Centre for Motor Neuron Disease Research, Department of Biomedical Sciences, Faculty of Medicine, Health, and Human SciencesMacquarie UniversityNorth RydeNew South WalesAustralia
| | - Clinton Turner
- Centre for Brain ResearchUniversity of AucklandAucklandNew Zealand
- Department of Anatomy and Medical ImagingUniversity of AucklandAucklandNew Zealand
- Department of Anatomical Pathology, LabPlusAuckland City HospitalAucklandNew Zealand
| | - Richard L. M. Faull
- Centre for Brain ResearchUniversity of AucklandAucklandNew Zealand
- Department of Anatomy and Medical ImagingUniversity of AucklandAucklandNew Zealand
| | - Maurice A. Curtis
- Centre for Brain ResearchUniversity of AucklandAucklandNew Zealand
- Department of Anatomy and Medical ImagingUniversity of AucklandAucklandNew Zealand
| | - Catriona McLean
- Department of Anatomical PathologyAlfred HealthMelbourneVictoriaAustralia
| | - Garth A. Nicholson
- Centre for Motor Neuron Disease Research, Department of Biomedical Sciences, Faculty of Medicine, Health, and Human SciencesMacquarie UniversityNorth RydeNew South WalesAustralia
- Northcott Neuroscience LaboratoryANZAC Research InstituteSydneyAustralia
- Molecular Medicine LaboratoryConcord Repatriation General HospitalSydneyAustralia
| | - Molly E. V. Swanson
- School of Biological SciencesUniversity of AucklandAucklandNew Zealand
- Centre for Brain ResearchUniversity of AucklandAucklandNew Zealand
| | - Emma L. Scotter
- School of Biological SciencesUniversity of AucklandAucklandNew Zealand
- Centre for Brain ResearchUniversity of AucklandAucklandNew Zealand
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Shi R, Zhang X, Li C, Zhao Y, Li R, Waterhouse GIN, Zhang T. Electrochemical oxidation of concentrated benzyl alcohol to high-purity benzaldehyde via superwetting organic-solid-water interfaces. Sci Adv 2024; 10:eadn0947. [PMID: 38669338 PMCID: PMC11051661 DOI: 10.1126/sciadv.adn0947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 03/26/2024] [Indexed: 04/28/2024]
Abstract
Organic electrosynthesis in aqueous media is presently hampered by the poor solubility of many organic reactants and thus low purity of liquid products in electrolytes. Using the electrooxidation of benzyl alcohol (BA) as a model reaction, we present a "sandwich-type" organic-solid-water (OSW) system, consisting of BA organic phase, KOH aqueous electrolyte, and porous anodes with Janus-like superwettability. The system allows independent diffusion of BA molecules from the organic phase to electrocatalytic active sites, enabling efficient electrooxidation of high-concentration BA to benzaldehyde (97% Faradaic efficiency at ~180 mA cm-2) with substantially reduced ohmic loss compared to conventional solid-liquid systems. The confined organic-water boundary within the electrode channels suppresses the interdiffusion of molecules and ions into the counterphase, thus preventing the hydration and overoxidation of benzaldehyde during long-term electrocatalysis. As a result, the direct production of high-purity benzaldehyde (91.7%) is achieved in a flow cell, showcasing the effectiveness of electrocatalysis over OSW interfaces for the one-step synthesis of high-purity organic compounds.
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Affiliation(s)
- Run Shi
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xuerui Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Petrochemical Research Institute, China National Petroleum Corporation, Beijing 112206, China
| | - Chengyu Li
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yunxuan Zhao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Rui Li
- College of Chemistry & Materials Science, Northwest University, Xi’an 710127, China
| | | | - Tierui Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Tasma Z, Rees TA, Guo S, Tan S, O'Carroll SJ, Faull RLM, Curtis MA, Christensen SL, Hay DL, Walker CS. Pharmacology of PACAP and VIP receptors in the spinal cord highlights the importance of the PAC 1 receptor. Br J Pharmacol 2024. [PMID: 38616050 DOI: 10.1111/bph.16376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 12/18/2023] [Accepted: 01/20/2024] [Indexed: 04/16/2024] Open
Abstract
BACKGROUND AND PURPOSE The spinal cord is a key structure involved in the transmission and modulation of pain. Pituitary adenylate cyclase-activating peptide (PACAP) and vasoactive intestinal peptide (VIP), are expressed in the spinal cord. These peptides activate G protein-coupled receptors (PAC1, VPAC1 and VPAC2) that could provide targets for the development of novel pain treatments. However, it is not clear which of these receptors are expressed within the spinal cord and how these receptors signal. EXPERIMENTAL APPROACH Dissociated rat spinal cord cultures were used to examine agonist and antagonist receptor pharmacology. Signalling profiles were determined for five signalling pathways. The expression of different PACAP and VIP receptors was then investigated in mouse, rat and human spinal cords using immunoblotting and immunofluorescence. KEY RESULTS PACAP, but not VIP, potently stimulated cAMP, IP1 accumulation and ERK and cAMP response element-binding protein (CREB) but not Akt phosphorylation in spinal cord cultures. Signalling was antagonised by M65 and PACAP6-38. PACAP-27 was more effectively antagonised than either PACAP-38 or VIP. The patterns of PAC1 and VPAC2 receptor-like immunoreactivity appeared to be distinct in the spinal cord. CONCLUSIONS AND IMPLICATIONS The pharmacological profile in the spinal cord suggested that a PAC1 receptor is the major functional receptor subtype present and thus likely mediates the nociceptive effects of the PACAP family of peptides in the spinal cord. However, the potential expression of both PAC1 and VPAC2 receptors in the spinal cord highlights that these receptors may play differential roles and are both possible therapeutic targets.
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Affiliation(s)
- Zoe Tasma
- School of Biological Sciences, The University of Auckland, Auckland, New Zealand
| | - Tayla A Rees
- School of Biological Sciences, The University of Auckland, Auckland, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland, New Zealand
| | - Song Guo
- Department of Neurology, Danish Headache Center, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
- Department of Odontology, Panum Institute, Faculty of Health, University of Copenhagen, Copenhagen, Denmark
| | - Sheryl Tan
- Department of Anatomy and Medical Imaging and Centre for Brain Research, Faculty of Medical and Health Science, The University of Auckland, Auckland, New Zealand
| | - Simon J O'Carroll
- Department of Anatomy and Medical Imaging and Centre for Brain Research, Faculty of Medical and Health Science, The University of Auckland, Auckland, New Zealand
| | - Richard L M Faull
- Department of Anatomy and Medical Imaging and Centre for Brain Research, Faculty of Medical and Health Science, The University of Auckland, Auckland, New Zealand
| | - Maurice A Curtis
- Department of Anatomy and Medical Imaging and Centre for Brain Research, Faculty of Medical and Health Science, The University of Auckland, Auckland, New Zealand
| | - Sarah L Christensen
- Department of Neurology, Danish Headache Center, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Debbie L Hay
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland, New Zealand
- Department of Pharmacology and Toxicology, The University of Otago, Dunedin, New Zealand
| | - Christopher S Walker
- School of Biological Sciences, The University of Auckland, Auckland, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Auckland, New Zealand
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Brand K, Wise T, Hess AJ, Russell BR, Stephan KE, Harrison OK. Incorporating uncertainty within dynamic interoceptive learning. Front Psychol 2024; 15:1254564. [PMID: 38646115 PMCID: PMC11026658 DOI: 10.3389/fpsyg.2024.1254564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 03/18/2024] [Indexed: 04/23/2024] Open
Abstract
Introduction Interoception, the perception of the internal state of the body, has been shown to be closely linked to emotions and mental health. Of particular interest are interoceptive learning processes that capture associations between environmental cues and body signals as a basis for making homeostatically relevant predictions about the future. One method of measuring respiratory interoceptive learning that has shown promising results is the Breathing Learning Task (BLT). While the original BLT required binary predictions regarding the presence or absence of an upcoming inspiratory resistance, here we extended this paradigm to capture continuous measures of prediction (un)certainty. Methods Sixteen healthy participants completed the continuous version of the BLT, where they were asked to predict the likelihood of breathing resistances on a continuous scale from 0.0 to 10.0. In order to explain participants' responses, a Rescorla-Wagner model of associative learning was combined with suitable observation models for continuous or binary predictions, respectively. For validation, we compared both models against corresponding null models and examined the correlation between observed and modeled predictions. The model was additionally extended to test whether learning rates differed according to stimuli valence. Finally, summary measures of prediction certainty as well as model estimates for learning rates were considered against interoceptive and mental health questionnaire measures. Results Our results demonstrated that the continuous model fits closely captured participant behavior using empirical data, and the binarised predictions showed excellent replicability compared to previously collected data. However, the model extension indicated that there were no significant differences between learning rates for negative (i.e. breathing resistance) and positive (i.e. no breathing resistance) stimuli. Finally, significant correlations were found between fatigue severity and both prediction certainty and learning rate, as well as between anxiety sensitivity and prediction certainty. Discussion These results demonstrate the utility of gathering enriched continuous prediction data in interoceptive learning tasks, and suggest that the updated BLT is a promising paradigm for future investigations into interoceptive learning and potential links to mental health.
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Affiliation(s)
- Katja Brand
- Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich and ETH Zurich, Zurich, Switzerland
- Department of Psychology, University of Otago, Dunedin, New Zealand
| | - Toby Wise
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, United Kingdom
| | - Alexander J. Hess
- Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich and ETH Zurich, Zurich, Switzerland
| | | | - Klaas E. Stephan
- Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich and ETH Zurich, Zurich, Switzerland
- Max Planck Institute for Metabolism Research, Cologne, Germany
| | - Olivia K. Harrison
- Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich and ETH Zurich, Zurich, Switzerland
- Department of Psychology, University of Otago, Dunedin, New Zealand
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom
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Thorpe H, Barrett N, Nemani MJ, O'Leary G, Ahmad N. "It made me feel like a shit parent": an intersectional analysis of pandemic mothering. Front Sociol 2024; 9:1359827. [PMID: 38629108 PMCID: PMC11018904 DOI: 10.3389/fsoc.2024.1359827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 03/11/2024] [Indexed: 04/19/2024]
Abstract
The COVID-19 pandemic brought to the fore the everyday and exceptional challenges for mothers. Rarely, however, did research or social commentary acknowledge the multiplicities of motherhood during this prolonged period of risk, disruption, and uncertainty. This paper draws upon interviews with 24 mothers living in Aotearoa New Zealand during the pandemic, including women who were pregnant and gave birth during lockdowns, teenage mothers, single and low-income mothers, and working mothers. The sample was intentionally diverse, including Māori, Pacific, Asian and migrant mothers. Engaging an intersectional lens on motherhood and women's health, this paper builds upon and extends feminist research on mothers' experiences during the pandemic, highlighting the many different challenges facing mothers of diverse social, cultural, and economic positionalities and during various stages of motherhood. Across the sample, we reveal the significant emotional toll on mothers, particularly with the absence of critical social, medical and health support systems during lockdown periods and sustained social restrictions. Many of the women described how the pandemic affected their feelings about motherhood, prompting new reflections on their relationships with the home, family, work, and broader society. Despite some similarities, the pandemic experiences of Māori, Pacific, migrant and single mothers were further intensified by various forms of isolation, judgement, and discrimination. In this way, the pandemic shed light on the gendering of everyday maternal life, but also the need for more intersectional culturally and gender-responsive policies that acknowledge the multi-layered complexities of mothers' lives.
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Affiliation(s)
- Holly Thorpe
- Te Huataki Waiora School of Health, University of Waikato, Hamilton, New Zealand
| | - Nikki Barrett
- Te Huataki Waiora School of Health, University of Waikato, Hamilton, New Zealand
| | - Mihi Joy Nemani
- Te Huataki Waiora School of Health, University of Waikato, Hamilton, New Zealand
| | - Grace O'Leary
- Te Huataki Waiora School of Health, University of Waikato, Hamilton, New Zealand
| | - Nida Ahmad
- Independent Scholar, Denver, CO, United States
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Blank ML, Hoek J. Smoking, vaping and drinking: A qualitative analysis of Aotearoa New Zealand young adults who tried e-cigarettes to stop smoking tobacco. Addiction 2024; 119:686-695. [PMID: 38114132 DOI: 10.1111/add.16413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 11/01/2023] [Indexed: 12/21/2023]
Abstract
BACKGROUND AND AIM Social practices such as smoking-drinking co-use often go 'hand-in-hand', linked by the coordination of materials, skills and meanings. However, the experience of using e-cigarettes while drinking among people who smoke (and drink) remains underexplored. We used social practice theory to show how smoking, vaping and drinking intersect and to explain how vaping created two new social practices among people who tried e-cigarettes to stop smoking: 'vaping-drinking' co-use and 'smoking-vaping-drinking' poly-use. METHODS We conducted five in-depth interviews over 18-24 weeks during 2018-19, with each of nine Aotearoa New Zealand young adults aged 20-29 years. Participants smoked daily, did not regularly use e-cigarettes at entry and wished to try vaping to stop smoking. We analysed participants' reports of smoking or vaping while drinking using thematic analysis. RESULTS Individual participants reported both co-use and poly-use occasions throughout the study. Vaping-drinking co-use arose from practice 'replacement' processes, where vaping fully substituted smoking. Smoking-vaping-drinking poly-use arose from 'adjacency' processes where vaping complemented smoking. Participants used both processes flexibly over time, which required new skills in material, temporal, pleasure and social coordination to try to recreate valued meanings of comfort, security and communality associated with well-established smoking-drinking practices. Unsuccessful coordination attempts maintained smoking-drinking co-use. CONCLUSION Among Aotearoa New Zealand young adult smokers who want to use vaping to stop smoking, drinking occasions may help to maintain existing smoking-drinking practices and facilitate the development of vaping-drinking co-use and smoking-vaping-drinking poly-use practices, potentially prolonging individuals' exposure to smoking.
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Affiliation(s)
- Mei-Ling Blank
- Department of Preventive and Social Medicine, University of Otago, Ōtepoti Dunedin, Aotearoa, New Zealand
| | - Janet Hoek
- Department of Public Health, University of Otago, Te Whanganui-a-Tara Pōneke, Wellington, Aotearoa, New Zealand
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Waller SJ, Egan E, Crow S, Charsley A, Lokman PM, Williams EK, Holmes EC, Geoghegan JL. Host and geography impact virus diversity in New Zealand's longfin and shortfin eels. Arch Virol 2024; 169:85. [PMID: 38546898 PMCID: PMC10978610 DOI: 10.1007/s00705-024-06019-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 03/17/2024] [Indexed: 04/01/2024]
Abstract
The fishing and aquaculture industry is vital for global food security, yet viral diseases can result in mass fish die-off events. Determining the viromes of traditionally understudied species, such as fish, enhances our understanding of the global virosphere and the factors that influence virome composition and disease emergence. Very little is known about the viruses present in New Zealand's native fish species, including the shortfin eel (Anguilla australis) and the longfin eel (Anguilla dieffenbachii), both of which are fished culturally by Māori (the indigenous population of New Zealand) and commercially. Through a total RNA metatranscriptomic analysis of longfin and shortfin eels across three different geographic locations in the South Island of New Zealand, we aimed to determine whether viruses had jumped between the two eel species and whether eel virome composition was impacted by life stage, species, and geographic location. We identified nine viral species spanning eight different families, thereby enhancing our understanding of eel virus diversity in New Zealand and the host range of these viral families. Viruses of the family Flaviviridae (genus Hepacivirus) were widespread and found in both longfin and shortfin eels, indicative of cross-species transmission or virus-host co-divergence. Notably, both host specificity and geographic location appeared to influence eel virome composition, highlighting the complex interaction between viruses, hosts, and their ecosystems. This study broadens our understanding of viromes in aquatic hosts and highlights the importance of gaining baseline knowledge of fish viral abundance and diversity, particularly in aquatic species that are facing population declines.
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Affiliation(s)
- Stephanie J Waller
- Department of Microbiology and Immunology, University of Otago, Dunedin, 9016, New Zealand
| | - Eimear Egan
- National Institute of Water and Atmospheric Research, Auckland, 1010, New Zealand
| | - Shannan Crow
- National Institute of Water and Atmospheric Research, Auckland, 1010, New Zealand
| | - Anthony Charsley
- National Institute of Water and Atmospheric Research, Auckland, 1010, New Zealand
| | - P Mark Lokman
- Department of Zoology, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand
| | - Erica K Williams
- National Institute of Water and Atmospheric Research, Auckland, 1010, New Zealand
| | - Edward C Holmes
- Sydney Institute for Infectious Diseases, School of Medical Sciences, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Jemma L Geoghegan
- Department of Microbiology and Immunology, University of Otago, Dunedin, 9016, New Zealand.
- Institute of Environmental Science and Research, Wellington, New Zealand.
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Pearman WS, Duffy GA, Liu XP, Gemmell NJ, Morales SE, Fraser CI. Macroalgal microbiome biogeography is shaped by environmental drivers rather than geographical distance. Ann Bot 2024; 133:169-182. [PMID: 37804485 PMCID: PMC10921836 DOI: 10.1093/aob/mcad151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 10/06/2023] [Indexed: 10/09/2023]
Abstract
BACKGROUND AND AIMS Contrasting patterns of host and microbiome biogeography can provide insight into the drivers of microbial community assembly. Distance-decay relationships are a classic biogeographical pattern shaped by interactions between selective and non-selective processes. Joint biogeography of microbiomes and their hosts is of increasing interest owing to the potential for microbiome-facilitated adaptation. METHODS In this study, we examine the coupled biogeography of the model macroalga Durvillaea and its microbiome using a combination of genotyping by sequencing (host) and 16S rRNA amplicon sequencing (microbiome). Alongside these approaches, we use environmental data to characterize the relationship between the microbiome, the host, and the environment. KEY RESULTS We show that although the host and microbiome exhibit shared biogeographical structure, these arise from different processes, with host biogeography showing classic signs of geographical distance decay, but with the microbiome showing environmental distance decay. Examination of microbial subcommunities, defined by abundance, revealed that the abundance of microbes is linked to environmental selection. As microbes become less common, the dominant ecological processes shift away from selective processes and towards neutral processes. Contrary to expectations, we found that ecological drift does not promote structuring of the microbiome. CONCLUSIONS Our results suggest that although host macroalgae exhibit a relatively 'typical' biogeographical pattern of declining similarity with increasing geographical distance, the microbiome is more variable and is shaped primarily by environmental conditions. Our findings suggest that the Baas Becking hypothesis of 'everything is everywhere, the environment selects' might be a useful hypothesis to understand the biogeography of macroalgal microbiomes. As environmental conditions change in response to anthropogenic influences, the processes structuring the microbiome of macroalgae might shift, whereas those governing the host biogeography are less likely to change. As a result, increasingly decoupled host-microbe biogeography might be observed in response to such human influences.
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Affiliation(s)
- William S Pearman
- Department of Marine Science, University of Otago, New Zealand
- Department of Anatomy, School of Biomedical Sciences, University of Otago, New Zealand
- Department of Microbiology & Immunology, School of Biomedical Sciences, University of Otago, New Zealand
| | - Grant A Duffy
- Department of Marine Science, University of Otago, New Zealand
| | - Xiaoyue P Liu
- Department of Marine Science, University of Otago, New Zealand
| | - Neil J Gemmell
- Department of Anatomy, School of Biomedical Sciences, University of Otago, New Zealand
| | - Sergio E Morales
- Department of Microbiology & Immunology, School of Biomedical Sciences, University of Otago, New Zealand
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Pearman WS, Morales SE, Vaux F, Gemmell NJ, Fraser CI. Host population crashes disrupt the diversity of associated marine microbiomes. Environ Microbiol 2024; 26:e16611. [PMID: 38519875 DOI: 10.1111/1462-2920.16611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Accepted: 03/01/2024] [Indexed: 03/25/2024]
Abstract
Host-associated microbial communities are shaped by myriad factors ranging from host conditions, environmental conditions and other microbes. Disentangling the ecological impact of each of these factors can be particularly difficult as many variables are correlated. Here, we leveraged earthquake-induced changes in host population structure to assess the influence of population crashes on marine microbial ecosystems. A large (7.8 magnitude) earthquake in New Zealand in 2016 led to widespread coastal uplift of up to ~6 m, sufficient to locally extirpate some intertidal southern bull kelp populations. These uplifted populations are slowly recovering, but remain at much lower densities than at nearby, less-uplifted sites. By comparing the microbial communities of the hosts from disturbed and relatively undisturbed populations using 16S rRNA gene amplicon sequencing, we observed that disturbed host populations supported higher functional, taxonomic and phylogenetic microbial beta diversity than non-disturbed host populations. Our findings shed light on microbiome ecological assembly processes, particularly highlighting that large-scale disturbances that affect host populations can dramatically influence microbiome structure. We suggest that disturbance-induced changes in host density limit the dispersal opportunities of microbes, with host community connectivity declining with the density of host populations.
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Affiliation(s)
- William S Pearman
- Department of Marine Science, University of Otago, Dunedin, New Zealand
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
- National Institute of Water and Atmospheric Research Ltd, Auckland, New Zealand
| | - Sergio E Morales
- Department of Microbiology and Immunology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Felix Vaux
- National Institute of Water and Atmospheric Research Ltd, Auckland, New Zealand
- Department of Zoology, University of Otago, Dunedin, New Zealand
| | - Neil J Gemmell
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Ceridwen I Fraser
- Department of Marine Science, University of Otago, Dunedin, New Zealand
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Tupou J, Ataera C, Wallace-Watkin C, Waddington H. Supporting tamariki takiwātanga Māori (autistic Māori children): Exploring the experience of early childhood educators. Autism 2024; 28:705-717. [PMID: 37401005 PMCID: PMC10913317 DOI: 10.1177/13623613231181622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/05/2023]
Abstract
LAY ABSTRACT The knowledge and attitudes of educators can have a strong influence on the experiences of autistic children who attend inclusive early childhood settings. Autistic children from under-represented ethnic groups, for example, tamariki takiwātanga Māori (autistic Māori children), are likely to face extra challenges and educators need to consider ways to support their cultural development. For this study, we interviewed 12 educators with recent experience supporting tamariki takiwātanga Māori in inclusive early childhood settings. We constructed three themes and seven subthemes from the interview data. We found that educators' understandings of autism were mostly in line with the neurodiversity perspective, which views autism as a difference, not a disorder. We also found similarities between the neurodiversity perspective and Māori perspectives of autism and a need for more training and resources based upon a Māori world view and available in te reo Māori (the Māori language).
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Ball J, Pettie MA, Poasa L, Abel G. Understanding youth drinking decline: Similarity and change in the function and social meaning of alcohol use (and non-use) in adolescent cohorts 20 years apart. Drug Alcohol Rev 2024; 43:664-674. [PMID: 37224083 DOI: 10.1111/dar.13685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 05/02/2023] [Accepted: 05/04/2023] [Indexed: 05/26/2023]
Abstract
INTRODUCTION Qualitative research aimed at understanding the decline in youth drinking has so far been hampered by a lack of baseline data for comparison. This New Zealand study overcomes this limitation by comparing archival qualitative data collected at the height of youth drinking (1999-2001) with contemporary data collected for this study (June-October 2022). The aim is to explore changes in the function and social meaning of alcohol use (and non-use) for two cohorts about 20 years apart. METHODS Both archival and contemporary data were collected from 14 to 17 year old secondary school students (years 10-12) through individual and small-group/pair interviews in matched suburban co-ed schools. Interviews explored friendships, lifestyles, romantic relationships and experiences and perceptions of substance use and non-use. RESULTS AND DISCUSSION Comparative analysis highlighted changes that may help to explain the decline in youth drinking, including an increased value placed on personal choice and acceptance of diversity; decreased face-to-face socialising and the emergence of social media as a central feature of adolescent social life, perhaps displacing key functions of drinking and partying; increased pervasiveness of risk discourses and increased awareness of health and social risks of alcohol; and increased framing of alcohol use as a coping mechanism by both drinkers and non-drinkers. CONCLUSIONS Collectively, these changes appear to have shifted the social position of drinking from an almost compulsory component of adolescent social life in 1999-2001, to an optional activity that many contemporary adolescents perceive to have high risks and few benefits.
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Affiliation(s)
- Jude Ball
- Department of Public Health, University of Otago, Wellington, New Zealand
| | - Michaela A Pettie
- Department of Public Health, University of Otago, Wellington, New Zealand
| | - Loleseti Poasa
- Department of Public Health, University of Otago, Wellington, New Zealand
| | - Gillian Abel
- Department of Population Health, University of Otago, Christchurch, New Zealand
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12
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Richardson GM, Evans MJ, Rajeshkumar T, McCone JAJ, Cameron SA, Maron L, Jones C, Anker MD. Synthesis and Reactivity of Discrete Europium(II) Hydride Complexes. Chemistry 2024:e202400681. [PMID: 38417144 DOI: 10.1002/chem.202400681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 02/27/2024] [Accepted: 02/28/2024] [Indexed: 03/01/2024]
Abstract
The bulky β-diketiminate ligand frameworks [BDIDCHP]- and [BDIDipp/Ar]- (BDI=[HC{C(Me)2N-Dipp/Ar}2]- (Dipp=2,6-diisopropylphenyl (Dipp); Ar=2,6-dicyclohexylphyenyl (DCHP) or 2,4,6-tricyclohexylphyenyl (TCHP)) have been developed for the kinetic stabilisation of the first europium (II) hydride complexes, [(BDIDCHP)Eu(μ-H)]2, [(BDIDipp/DCHP)Eu(μ-H)]2 and [(BDIDipp/TCHP)Eu(μ-H)]2, respectively. These complexes represent the first step beyond the current lanthanide(II) hydrides that are all based on ytterbium. Tuning the steric profile of β-diketiminate ligands from a symmetrical to unsymmetrical disposition, enhanced solubility and stability in the solution-state. This provides the first opportunity to study the structure and bonding of these novel Eu(II) hydride complexes crystallographically, spectroscopically and computationally, with their preliminary reactivity investigated.
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Affiliation(s)
- Georgia M Richardson
- School of Chemical and Physical Sciences/Ferrier Institute, Victoria University of Wellington, PO Box 600, Wellington, 6012, New Zealand
| | - Matthew J Evans
- School of Chemistry, PO Box 23, Monash University, VIC, 3800, Australia
| | - Thayalan Rajeshkumar
- Université de Toulouse et CNRS, INSA UPS, UMR5215, LPCNO, 135 Avenue de Rangueil, 31077, Toulouse, France
| | - Jordan A J McCone
- School of Chemical and Physical Sciences/Ferrier Institute, Victoria University of Wellington, PO Box 600, Wellington, 6012, New Zealand
| | - Scott A Cameron
- School of Chemical and Physical Sciences/Ferrier Institute, Victoria University of Wellington, PO Box 600, Wellington, 6012, New Zealand
| | - Laurent Maron
- Université de Toulouse et CNRS, INSA UPS, UMR5215, LPCNO, 135 Avenue de Rangueil, 31077, Toulouse, France
| | - Cameron Jones
- School of Chemistry, PO Box 23, Monash University, VIC, 3800, Australia
| | - Mathew D Anker
- School of Chemical and Physical Sciences/Ferrier Institute, Victoria University of Wellington, PO Box 600, Wellington, 6012, New Zealand
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13
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Dowle EJ, Trewick SA, Morgan-Richards M. Fossil-calibrated phylogenies of Southern cave wētā show dispersal and extinction confound biogeographic signal. R Soc Open Sci 2024; 11:231118. [PMID: 38356874 PMCID: PMC10864783 DOI: 10.1098/rsos.231118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 01/19/2024] [Indexed: 02/16/2024]
Abstract
The biota of continents and islands are commonly considered to have a source-sink relationship, but small islands can harbour distinctive taxa. The distribution of four monotypic genera of Orthoptera on young subantarctic islands indicates a role for long-distance dispersal and extinction. Phylogenetic relationships were inferred from whole mtDNA genomes and nuclear sequences (45S cassette; four histones). We used a fossil and one palaeogeographic event to calibrate molecular clock analysis. We confirm that neither the Australian nor Aotearoa-New Zealand Rhaphidophoridae faunas are monophyletic. The radiation of Macropathinae may have begun in the late Jurassic, but trans-oceanic dispersal is required to explain the current distribution of some lineages within this subfamily. Dating the most recent common ancestor of seven island endemic species with their nearest mainland relative suggests that each existed long before their island home was available. Time estimates from our fossil-calibrated molecular clock analysis suggest several lineages have not been detected on mainland New Zealand, Australia, or elsewhere most probably due to their extinction, providing evidence that patterns of extinction, which are not consistently linked to range size or lineage age, confound biogeographic signal.
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Affiliation(s)
- Eddy J. Dowle
- Department of Anatomy, University of Otago, 9016 Dunedin, New Zealand
| | - Steven A. Trewick
- Ecology, School of Natural Sciences, Massey University Manawatū, Private Bag 11 222, Palmerston North 4410, New Zealand
| | - Mary Morgan-Richards
- Ecology, School of Natural Sciences, Massey University Manawatū, Private Bag 11 222, Palmerston North 4410, New Zealand
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14
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Siqueira T, Hawkins CP, Olden JD, Tonkin J, Comte L, Saito VS, Anderson TL, Barbosa GP, Bonada N, Bonecker CC, Cañedo-Argüelles M, Datry T, Flinn MB, Fortuño P, Gerrish GA, Haase P, Hill MJ, Hood JM, Huttunen KL, Jeffries MJ, Muotka T, O'Donnell DR, Paavola R, Paril P, Paterson MJ, Patrick CJ, Perbiche-Neves G, Rodrigues LC, Schneider SC, Straka M, Ruhi A. Understanding temporal variability across trophic levels and spatial scales in freshwater ecosystems. Ecology 2024; 105:e4219. [PMID: 38037301 DOI: 10.1002/ecy.4219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 09/10/2023] [Accepted: 10/30/2023] [Indexed: 12/02/2023]
Abstract
A tenet of ecology is that temporal variability in ecological structure and processes tends to decrease with increasing spatial scales (from locales to regions) and levels of biological organization (from populations to communities). However, patterns in temporal variability across trophic levels and the mechanisms that produce them remain poorly understood. Here we analyzed the abundance time series of spatially structured communities (i.e., metacommunities) spanning basal resources to top predators from 355 freshwater sites across three continents. Specifically, we used a hierarchical partitioning method to disentangle the propagation of temporal variability in abundance across spatial scales and trophic levels. We then used structural equation modeling to determine if the strength and direction of relationships between temporal variability, synchrony, biodiversity, and environmental and spatial settings depended on trophic level and spatial scale. We found that temporal variability in abundance decreased from producers to tertiary consumers but did so mainly at the local scale. Species population synchrony within sites increased with trophic level, whereas synchrony among communities decreased. At the local scale, temporal variability in precipitation and species diversity were associated with population variability (linear partial coefficient, β = 0.23) and population synchrony (β = -0.39) similarly across trophic levels, respectively. At the regional scale, community synchrony was not related to climatic or spatial predictors, but the strength of relationships between metacommunity variability and community synchrony decreased systematically from top predators (β = 0.73) to secondary consumers (β = 0.54), to primary consumers (β = 0.30) to producers (β = 0). Our results suggest that mobile predators may often stabilize metacommunities by buffering variability that originates at the base of food webs. This finding illustrates that the trophic structure of metacommunities, which integrates variation in organismal body size and its correlates, should be considered when investigating ecological stability in natural systems. More broadly, our work advances the notion that temporal stability is an emergent property of ecosystems that may be threatened in complex ways by biodiversity loss and habitat fragmentation.
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Affiliation(s)
- Tadeu Siqueira
- Institute of Biosciences, São Paulo State University (UNESP), Rio Claro, Brazil
- Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, California, USA
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - Charles P Hawkins
- Department of Watershed Sciences, National Aquatic Monitoring Center, and Ecology Center, Utah State University, Logan, Utah, USA
| | - Julian D Olden
- School of Aquatic and Fishery Sciences, University of Washington, Seattle, Washington, USA
| | - Jonathan Tonkin
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
- Te Pūnaha Matatini, Centre of Research Excellence in Complex Systems, Bioprotection Aotearoa, Centre of Research Excellence, Auckland, New Zealand
| | - Lise Comte
- School of Biological Sciences, Illinois State University, Normal, Illinois, USA
| | - Victor S Saito
- Department of Environmental Sciences, Federal University of São Carlos, São Carlos, Brazil
| | - Thomas L Anderson
- Department of Biological Sciences, Southern Illinois University, Edwardsville, Illinois, USA
| | - Gedimar P Barbosa
- Institute of Biosciences, São Paulo State University (UNESP), Rio Claro, Brazil
| | - Núria Bonada
- FEHM-Lab (Freshwater Ecology, Hydrology and Management), Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Facultat de Biologia, Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona (UB), Barcelona, Spain
| | | | - Miguel Cañedo-Argüelles
- FEHM-Lab, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain
| | - Thibault Datry
- INRAE, UR RiverLy, Centre Lyon-Grenoble Auvergne-Rhône-Alpes, Villeurbanne Cedex, France
| | - Michael B Flinn
- Hancock Biological Station, Biological Sciences, Murray State University, Murray, Kentucky, USA
| | - Pau Fortuño
- FEHM-Lab (Freshwater Ecology, Hydrology and Management), Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Facultat de Biologia, Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona (UB), Barcelona, Spain
| | - Gretchen A Gerrish
- University of Wisconsin Madison, Center for Limnology-Trout Lake Station, Boulder Junction, Wisconsin, USA
| | - Peter Haase
- Department of River Ecology and Conservation, Senckenberg Research Institute and Natural History Museum, Frankfurt, Germany
- Faculty of Biology, University of Duisburg-Essen, Essen, Germany
| | - Matthew J Hill
- Department of Life and Environmental Sciences, Faculty of Science and Technology, Bournemouth University, Poole, UK
| | - James M Hood
- Aquatic Ecology Laboratory, Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, Columbus, Ohio, USA
- Translational Data Analytics Institute, The Ohio State University, Columbus, Ohio, USA
| | | | | | - Timo Muotka
- Department of Ecology and Genetics, University of Oulu, Oulu, Finland
| | - Daniel R O'Donnell
- Department of Wildlife, Fish and Conservation Biology, University of California, Davis, California, USA
| | - Riku Paavola
- Oulanka Research Station, University of Oulu, Oulu, Finland
| | - Petr Paril
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Michael J Paterson
- International Institute for Sustainable Development Experimental Lakes Area, Kenora, Ontario, Canada
| | | | | | | | | | - Michal Straka
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
- T.G. Masaryk Water Research Institute p.r.i., Brno Branch Office, Brno, Czech Republic
| | - Albert Ruhi
- Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, California, USA
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15
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Collienne L, Whidden C, Gavryushkin A. Ranked Subtree Prune and Regraft. Bull Math Biol 2024; 86:24. [PMID: 38294587 PMCID: PMC10830682 DOI: 10.1007/s11538-023-01244-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 12/06/2023] [Indexed: 02/01/2024]
Abstract
Phylogenetic trees are a mathematical formalisation of evolutionary histories between organisms, species, genes, cancer cells, etc. For many applications, e.g. when analysing virus transmission trees or cancer evolution, (phylogenetic) time trees are of interest, where branch lengths represent times. Computational methods for reconstructing time trees from (typically molecular) sequence data, for example Bayesian phylogenetic inference using Markov Chain Monte Carlo (MCMC) methods, rely on algorithms that sample the treespace. They employ tree rearrangement operations such as [Formula: see text] (Subtree Prune and Regraft) and [Formula: see text] (Nearest Neighbour Interchange) or, in the case of time tree inference, versions of these that take times of internal nodes into account. While the classic [Formula: see text] tree rearrangement is well-studied, its variants for time trees are less understood, limiting comparative analysis for time tree methods. In this paper we consider a modification of the classical [Formula: see text] rearrangement on the space of ranked phylogenetic trees, which are trees equipped with a ranking of all internal nodes. This modification results in two novel treespaces, which we propose to study. We begin this study by discussing algorithmic properties of these treespaces, focusing on those relating to the complexity of computing distances under the ranked [Formula: see text] operations as well as similarities and differences to known tree rearrangement based treespaces. Surprisingly, we show the counterintuitive result that adding leaves to trees can actually decrease their ranked [Formula: see text] distance, which may have an impact on the results of time tree sampling algorithms given uncertain "rogue taxa".
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Affiliation(s)
- Lena Collienne
- Biological Data Science Laboratory, School of Mathematics and Statistics, University of Canterbury, Christchurch, New Zealand.
| | - Chris Whidden
- Faculty of Computer Science, Dalhousie University, Halifax, Canada
| | - Alex Gavryushkin
- Biological Data Science Laboratory, School of Mathematics and Statistics, University of Canterbury, Christchurch, New Zealand
- Biomathematics Research Centre, University of Canterbury, Christchurch, New Zealand
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16
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Coker SJ, Berry MJ, Vissers MCM, Dyson RM. Maternal Vitamin C Intake during Pregnancy Influences Long-Term Offspring Growth with Timing- and Sex-Specific Effects in Guinea Pigs. Nutrients 2024; 16:369. [PMID: 38337653 PMCID: PMC10857109 DOI: 10.3390/nu16030369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/18/2024] [Accepted: 01/25/2024] [Indexed: 02/12/2024] Open
Abstract
Our previous work in guinea pigs revealed that low vitamin C intake during preconception and pregnancy adversely affects fertility, pregnancy outcomes, and foetal and neonatal growth in a sex-dependent manner. To investigate the long-term impact on offspring, we monitored their growth from birth to adolescence (four months), recorded organ weights at childhood equivalence (28 days) and adolescence, and assessed physiological parameters like oral glucose tolerance and basal cortisol concentrations. We also investigated the effects of the timing of maternal vitamin C restriction (early vs. late gestation) on pregnancy outcomes and the health consequences for offspring. Dunkin Hartley guinea pigs were fed an optimal (900 mg/kg feed) or low (100 mg/kg feed) vitamin C diet ad libitum during preconception. Pregnant dams were then randomised into four feeding regimens: consistently optimal, consistently low, low during early pregnancy, or low during late pregnancy. We found that low maternal vitamin C intake during early pregnancy accelerated foetal and neonatal growth in female offspring and altered glucose homeostasis in the offspring of both sexes at an age equivalent to early childhood. Conversely, low maternal vitamin C intake during late pregnancy resulted in foetal growth restriction and reduced weight gain in male offspring throughout their lifespan. We conclude that altered vitamin C during development has long-lasting, sex-specific consequences for offspring and that the timing of vitamin C depletion is also critical, with low levels during early development being associated with the development of a metabolic syndrome-related phenotype, while later deprivation appears to be linked to a growth-faltering phenotype.
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Affiliation(s)
- Sharna J. Coker
- Perinatal and Developmental Physiology Group, Department of Paediatrics and Child Health, University of Otago, Wellington 6242, New Zealand; (M.J.B.); (R.M.D.)
| | - Mary J. Berry
- Perinatal and Developmental Physiology Group, Department of Paediatrics and Child Health, University of Otago, Wellington 6242, New Zealand; (M.J.B.); (R.M.D.)
| | - Margreet C. M. Vissers
- Mātai Hāora-Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch 8140, New Zealand;
| | - Rebecca M. Dyson
- Perinatal and Developmental Physiology Group, Department of Paediatrics and Child Health, University of Otago, Wellington 6242, New Zealand; (M.J.B.); (R.M.D.)
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17
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Jones GH, Snodgrass C, Tubiana C, Küppers M, Kawakita H, Lara LM, Agarwal J, André N, Attree N, Auster U, Bagnulo S, Bannister M, Beth A, Bowles N, Coates A, Colangeli L, Corral van Damme C, Da Deppo V, De Keyser J, Della Corte V, Edberg N, El-Maarry MR, Faggi S, Fulle M, Funase R, Galand M, Goetz C, Groussin O, Guilbert-Lepoutre A, Henri P, Kasahara S, Kereszturi A, Kidger M, Knight M, Kokotanekova R, Kolmasova I, Kossacki K, Kührt E, Kwon Y, La Forgia F, Levasseur-Regourd AC, Lippi M, Longobardo A, Marschall R, Morawski M, Muñoz O, Näsilä A, Nilsson H, Opitom C, Pajusalu M, Pommerol A, Prech L, Rando N, Ratti F, Rothkaehl H, Rotundi A, Rubin M, Sakatani N, Sánchez JP, Simon Wedlund C, Stankov A, Thomas N, Toth I, Villanueva G, Vincent JB, Volwerk M, Wurz P, Wielders A, Yoshioka K, Aleksiejuk K, Alvarez F, Amoros C, Aslam S, Atamaniuk B, Baran J, Barciński T, Beck T, Behnke T, Berglund M, Bertini I, Bieda M, Binczyk P, Busch MD, Cacovean A, Capria MT, Carr C, Castro Marín JM, Ceriotti M, Chioetto P, Chuchra-Konrad A, Cocola L, Colin F, Crews C, Cripps V, Cupido E, Dassatti A, Davidsson BJR, De Roche T, Deca J, Del Togno S, Dhooghe F, Donaldson Hanna K, Eriksson A, Fedorov A, Fernández-Valenzuela E, Ferretti S, Floriot J, Frassetto F, Fredriksson J, Garnier P, Gaweł D, Génot V, Gerber T, Glassmeier KH, Granvik M, Grison B, Gunell H, Hachemi T, Hagen C, Hajra R, Harada Y, Hasiba J, Haslebacher N, Herranz De La Revilla ML, Hestroffer D, Hewagama T, Holt C, Hviid S, Iakubivskyi I, Inno L, Irwin P, Ivanovski S, Jansky J, Jernej I, Jeszenszky H, Jimenéz J, Jorda L, Kama M, Kameda S, Kelley MSP, Klepacki K, Kohout T, Kojima H, Kowalski T, Kuwabara M, Ladno M, Laky G, Lammer H, Lan R, Lavraud B, Lazzarin M, Le Duff O, Lee QM, Lesniak C, Lewis Z, Lin ZY, Lister T, Lowry S, Magnes W, Markkanen J, Martinez Navajas I, Martins Z, Matsuoka A, Matyjasiak B, Mazelle C, Mazzotta Epifani E, Meier M, Michaelis H, Micheli M, Migliorini A, Millet AL, Moreno F, Mottola S, Moutounaick B, Muinonen K, Müller DR, Murakami G, Murata N, Myszka K, Nakajima S, Nemeth Z, Nikolajev A, Nordera S, Ohlsson D, Olesk A, Ottacher H, Ozaki N, Oziol C, Patel M, Savio Paul A, Penttilä A, Pernechele C, Peterson J, Petraglio E, Piccirillo AM, Plaschke F, Polak S, Postberg F, Proosa H, Protopapa S, Puccio W, Ranvier S, Raymond S, Richter I, Rieder M, Rigamonti R, Ruiz Rodriguez I, Santolik O, Sasaki T, Schrödter R, Shirley K, Slavinskis A, Sodor B, Soucek J, Stephenson P, Stöckli L, Szewczyk P, Troznai G, Uhlir L, Usami N, Valavanoglou A, Vaverka J, Wang W, Wang XD, Wattieaux G, Wieser M, Wolf S, Yano H, Yoshikawa I, Zakharov V, Zawistowski T, Zuppella P, Rinaldi G, Ji H. The Comet Interceptor Mission. Space Sci Rev 2024; 220:9. [PMID: 38282745 PMCID: PMC10808369 DOI: 10.1007/s11214-023-01035-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 11/29/2023] [Indexed: 01/30/2024]
Abstract
Here we describe the novel, multi-point Comet Interceptor mission. It is dedicated to the exploration of a little-processed long-period comet, possibly entering the inner Solar System for the first time, or to encounter an interstellar object originating at another star. The objectives of the mission are to address the following questions: What are the surface composition, shape, morphology, and structure of the target object? What is the composition of the gas and dust in the coma, its connection to the nucleus, and the nature of its interaction with the solar wind? The mission was proposed to the European Space Agency in 2018, and formally adopted by the agency in June 2022, for launch in 2029 together with the Ariel mission. Comet Interceptor will take advantage of the opportunity presented by ESA's F-Class call for fast, flexible, low-cost missions to which it was proposed. The call required a launch to a halo orbit around the Sun-Earth L2 point. The mission can take advantage of this placement to wait for the discovery of a suitable comet reachable with its minimum Δ V capability of 600 ms - 1 . Comet Interceptor will be unique in encountering and studying, at a nominal closest approach distance of 1000 km, a comet that represents a near-pristine sample of material from the formation of the Solar System. It will also add a capability that no previous cometary mission has had, which is to deploy two sub-probes - B1, provided by the Japanese space agency, JAXA, and B2 - that will follow different trajectories through the coma. While the main probe passes at a nominal 1000 km distance, probes B1 and B2 will follow different chords through the coma at distances of 850 km and 400 km, respectively. The result will be unique, simultaneous, spatially resolved information of the 3-dimensional properties of the target comet and its interaction with the space environment. We present the mission's science background leading to these objectives, as well as an overview of the scientific instruments, mission design, and schedule.
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Affiliation(s)
- Geraint H. Jones
- Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, UK
- The Centre for Planetary Sciences at UCL/Birkbeck, London, UK
| | | | | | - Michael Küppers
- European Space Agency (ESA), European Space Astronomy Centre (ESAC), Madrid, Spain
| | - Hideyo Kawakita
- Koyama Astronomical Observatory, Kyoto Sangyo University, Kyoto, Japan
| | - Luisa M. Lara
- Instituto de Astrofisica de Andalucía – CSIC, Granada, Spain
| | - Jessica Agarwal
- Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
| | - Nicolas André
- IRAP, CNRS, University Toulouse 3, CNES, Toulouse, France
| | - Nicholas Attree
- Instituto de Astrofisica de Andalucía – CSIC, Granada, Spain
| | - Uli Auster
- Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
| | | | | | - Arnaud Beth
- Department of Physics, Imperial College London, London, UK
| | - Neil Bowles
- Department of Physics, University of Oxford, Oxford, UK
| | - Andrew Coates
- Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, UK
- The Centre for Planetary Sciences at UCL/Birkbeck, London, UK
| | | | | | - Vania Da Deppo
- CNR-Institute for Photonics and Nanotechnologies, Padova, Italy
| | - Johan De Keyser
- Royal Belgian Institute of Space Aeronomy, Brussels, Belgium
| | | | - Niklas Edberg
- Swedish Institute of Space Physics, Uppsala/Kiruna, Sweden
| | - Mohamed Ramy El-Maarry
- Space and Planetary Science Center and Department of Earth Sciences, Khalifa University, Abu Dhabi, United Arab Emirates
| | - Sara Faggi
- NASA Goddard Space Flight Center, Greenbelt, USA
| | - Marco Fulle
- INAF – Osservatorio Astronomico di Trieste, Trieste, Italy
| | - Ryu Funase
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | - Marina Galand
- Department of Physics, Imperial College London, London, UK
| | | | - Olivier Groussin
- Laboratoire d’Astrophysique de Marseille, Aix-Marseille Université, CNRS, Marseille, France
| | | | - Pierre Henri
- Laboratoire Lagrange, CNRS, OCA, Université Côte d’Azur, and LPC2E, CNRS, Université d’Orléans, CNES, Orléans, France
| | | | - Akos Kereszturi
- Konkoly Astronomical Institute, Research Centre for Astronomy and Earth Sciences, HUN-REN, Budapest, Hungary
| | - Mark Kidger
- European Space Agency (ESA), European Space Astronomy Centre (ESAC), Madrid, Spain
| | | | - Rosita Kokotanekova
- Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Ivana Kolmasova
- Institute of Atmospheric Physics of the Czech Academy of Sciences, Prague, Czech Republic
| | | | - Ekkehard Kührt
- DLR, Institute of Optical Sensor Systems, Berlin, Germany
| | - Yuna Kwon
- Caltech/IPAC, 1200 E California Blvd, MC 100-22 Pasadena, CA 91125, USA
| | | | | | - Manuela Lippi
- Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
| | | | - Raphael Marschall
- CNRS, Laboratoire J.-L. Lagrange, Observatoire de la Côte d’Azur, Nice, France
| | - Marek Morawski
- Space Research Centre of the Polish Academy of Sciences, Warsaw, Poland
| | - Olga Muñoz
- Instituto de Astrofisica de Andalucía – CSIC, Granada, Spain
| | - Antti Näsilä
- VTT Technical Research Centre of Finland Ltd, Espoo, Finland
| | - Hans Nilsson
- Swedish Institute of Space Physics, Uppsala/Kiruna, Sweden
| | | | | | - Antoine Pommerol
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | | | - Nicola Rando
- European Space Agency, ESTEC, Noordwijk, The Netherlands
| | | | - Hanna Rothkaehl
- Space Research Centre of the Polish Academy of Sciences, Warsaw, Poland
| | - Alessandra Rotundi
- Dipartimento di Scienze e Tecnologie, Università degli Studi di Napoli “Parthenope”, Napoli, Italy
| | - Martin Rubin
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Naoya Sakatani
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | - Joan Pau Sánchez
- Institut Supérieur de l’Aéronautique et de l’Espace, Toulouse, France
| | | | | | - Nicolas Thomas
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Imre Toth
- Konkoly Astronomical Institute, Research Centre for Astronomy and Earth Sciences, HUN-REN, Budapest, Hungary
| | | | | | - Martin Volwerk
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | - Peter Wurz
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Arno Wielders
- European Space Agency, ESTEC, Noordwijk, The Netherlands
| | | | - Konrad Aleksiejuk
- Space Research Centre of the Polish Academy of Sciences, Warsaw, Poland
| | | | - Carine Amoros
- IRAP, CNRS, University Toulouse 3, CNES, Toulouse, France
| | - Shahid Aslam
- NASA Goddard Space Flight Center, Greenbelt, USA
| | - Barbara Atamaniuk
- Space Research Centre of the Polish Academy of Sciences, Warsaw, Poland
| | - Jędrzej Baran
- Space Research Centre of the Polish Academy of Sciences, Warsaw, Poland
| | - Tomasz Barciński
- Space Research Centre of the Polish Academy of Sciences, Warsaw, Poland
| | - Thomas Beck
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Thomas Behnke
- DLR Institute of Planetary Research, Berlin, Germany
| | | | - Ivano Bertini
- Dipartimento di Scienze e Tecnologie, Università degli Studi di Napoli “Parthenope”, Napoli, Italy
| | | | | | - Martin-Diego Busch
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | | | | | - Chris Carr
- Department of Physics, Imperial College London, London, UK
| | | | | | - Paolo Chioetto
- CNR-Institute for Photonics and Nanotechnologies, Padova, Italy
| | | | - Lorenzo Cocola
- CNR-Institute for Photonics and Nanotechnologies, Padova, Italy
| | - Fabrice Colin
- LPC2E, CNRS, Université d’Orléans, CNES, Orléans, France
| | | | | | | | - Alberto Dassatti
- REDS, School of Management and Engineering Vaud, HES-SO University of Applied Sciences and Arts Western Switzerland, Delémont, Switzerland
| | | | - Thierry De Roche
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Jan Deca
- Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, USA
| | | | | | | | | | - Andrey Fedorov
- IRAP, CNRS, University Toulouse 3, CNES, Toulouse, France
| | | | - Stefano Ferretti
- Dipartimento di Scienze e Tecnologie, Università degli Studi di Napoli “Parthenope”, Napoli, Italy
| | - Johan Floriot
- Laboratoire d’Astrophysique de Marseille, Aix-Marseille Université, CNRS, Marseille, France
| | - Fabio Frassetto
- CNR-Institute for Photonics and Nanotechnologies, Padova, Italy
| | | | | | | | - Vincent Génot
- IRAP, CNRS, University Toulouse 3, CNES, Toulouse, France
| | - Thomas Gerber
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Karl-Heinz Glassmeier
- Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
| | - Mikael Granvik
- Department of Physics, University of Helsinki, Helsinki, Finland
- Asteroid Engineering Lab, Luleå University of Technology, Kiruna, Sweden
| | - Benjamin Grison
- Institute of Atmospheric Physics of the Czech Academy of Sciences, Prague, Czech Republic
| | | | | | - Christian Hagen
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | | | | | - Johann Hasiba
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | - Nico Haslebacher
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | | | - Daniel Hestroffer
- IMCCE, Paris Observatory, Université PSL, CNRS, Sorbonne Université, Univ. Lille, Paris, France
| | | | | | - Stubbe Hviid
- DLR Institute of Planetary Research, Berlin, Germany
| | | | - Laura Inno
- Dipartimento di Scienze e Tecnologie, Università degli Studi di Napoli “Parthenope”, Napoli, Italy
| | - Patrick Irwin
- Department of Physics, University of Oxford, Oxford, UK
| | | | - Jiri Jansky
- Institute of Atmospheric Physics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Irmgard Jernej
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | - Harald Jeszenszky
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | - Jaime Jimenéz
- Instituto de Astrofisica de Andalucía – CSIC, Granada, Spain
| | - Laurent Jorda
- Laboratoire d’Astrophysique de Marseille, Aix-Marseille Université, CNRS, Marseille, France
| | - Mihkel Kama
- Tartu Observatory, University of Tartu, Tartu, Estonia
- University College London, London, UK
| | | | | | | | - Tomáš Kohout
- Department of Geosciences and Geography, University of Helsinki, Helsinki, Finland
- Institute of Geology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Hirotsugu Kojima
- Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan
| | - Tomasz Kowalski
- Space Research Centre of the Polish Academy of Sciences, Warsaw, Poland
| | | | | | - Gunter Laky
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | - Helmut Lammer
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | - Radek Lan
- Institute of Atmospheric Physics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Benoit Lavraud
- Laboratoire d’astrophysique de Bordeaux, Univ. Bordeaux, CNRS, Nouvelle-Aquitaine, France
| | - Monica Lazzarin
- Department of Physics and Astronomy, University of Padova, Padova, Italy
| | | | - Qiu-Mei Lee
- IRAP, CNRS, University Toulouse 3, CNES, Toulouse, France
| | | | - Zoe Lewis
- Department of Physics, Imperial College London, London, UK
| | - Zhong-Yi Lin
- Institute of Astronomy, National Central University, Taoyuan, Taiwan
| | | | | | - Werner Magnes
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | - Johannes Markkanen
- Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
| | | | - Zita Martins
- Centro de Química Estrutural, Institute of Molecular Sciences and Department of Chemical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | | | | | | | | | - Mirko Meier
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | | | | | | | | | - Fernando Moreno
- Instituto de Astrofisica de Andalucía – CSIC, Granada, Spain
| | | | | | - Karri Muinonen
- Department of Physics, University of Helsinki, Helsinki, Finland
| | - Daniel R. Müller
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Go Murakami
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | - Naofumi Murata
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | | | - Shintaro Nakajima
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | - Zoltan Nemeth
- Wigner Research Centre for Physics, Budapest, Hungary
| | | | - Simone Nordera
- CNR-Institute for Photonics and Nanotechnologies, Padova, Italy
| | - Dan Ohlsson
- Swedish Institute of Space Physics, Uppsala/Kiruna, Sweden
| | - Aire Olesk
- Tartu Observatory, University of Tartu, Tartu, Estonia
| | - Harald Ottacher
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | - Naoya Ozaki
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | | | | | | | - Antti Penttilä
- Department of Physics, University of Helsinki, Helsinki, Finland
| | | | | | - Enrico Petraglio
- REDS, School of Management and Engineering Vaud, HES-SO University of Applied Sciences and Arts Western Switzerland, Delémont, Switzerland
| | - Alice Maria Piccirillo
- Dipartimento di Scienze e Tecnologie, Università degli Studi di Napoli “Parthenope”, Napoli, Italy
| | - Ferdinand Plaschke
- Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
| | - Szymon Polak
- Space Research Centre of the Polish Academy of Sciences, Warsaw, Poland
| | | | - Herman Proosa
- Tartu Observatory, University of Tartu, Tartu, Estonia
| | | | - Walter Puccio
- Swedish Institute of Space Physics, Uppsala/Kiruna, Sweden
| | - Sylvain Ranvier
- Royal Belgian Institute of Space Aeronomy, Brussels, Belgium
| | - Sean Raymond
- Laboratoire d’astrophysique de Bordeaux, Univ. Bordeaux, CNRS, Nouvelle-Aquitaine, France
| | - Ingo Richter
- Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
| | - Martin Rieder
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Roberto Rigamonti
- REDS, School of Management and Engineering Vaud, HES-SO University of Applied Sciences and Arts Western Switzerland, Delémont, Switzerland
| | | | - Ondrej Santolik
- Institute of Atmospheric Physics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Takahiro Sasaki
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | | | | | | | | | - Jan Soucek
- Institute of Atmospheric Physics of the Czech Academy of Sciences, Prague, Czech Republic
| | | | - Linus Stöckli
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Paweł Szewczyk
- Space Research Centre of the Polish Academy of Sciences, Warsaw, Poland
| | | | - Ludek Uhlir
- Institute of Atmospheric Physics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Naoto Usami
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | - Aris Valavanoglou
- Austrian Academy of Sciences, Space Research Institute, Graz, Austria
| | | | - Wei Wang
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Xiao-Dong Wang
- Swedish Institute of Space Physics, Uppsala/Kiruna, Sweden
| | - Gaëtan Wattieaux
- Laboratoire Plasma et Conversion d’Energie (LAPLACE), CNRS, Université de Toulouse 3, Toulouse, France
| | - Martin Wieser
- Swedish Institute of Space Physics, Uppsala/Kiruna, Sweden
| | - Sebastian Wolf
- Space Research and Planetary Sciences, Physics Institute, University of Bern, Bern, Switzerland
| | - Hajime Yano
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | | | - Vladimir Zakharov
- LESIA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, Paris, France
| | | | - Paola Zuppella
- CNR-Institute for Photonics and Nanotechnologies, Padova, Italy
| | | | - Hantao Ji
- Department of Astrophysical Sciences, Princeton University, Princeton, USA
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18
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Tan WJ, Hawley HR, Wilson SJ, Fitzsimons HL. Deciphering the roles of subcellular distribution and interactions involving the MEF2 binding region, the ankyrin repeat binding motif and the catalytic site of HDAC4 in Drosophila neuronal morphogenesis. BMC Biol 2024; 22:2. [PMID: 38167120 PMCID: PMC10763444 DOI: 10.1186/s12915-023-01800-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 12/06/2023] [Indexed: 01/05/2024] Open
Abstract
BACKGROUND Dysregulation of nucleocytoplasmic shuttling of histone deacetylase 4 (HDAC4) is associated with several neurodevelopmental and neurodegenerative disorders. Consequently, understanding the roles of nuclear and cytoplasmic HDAC4 along with the mechanisms that regulate nuclear entry and exit is an area of concerted effort. Efficient nuclear entry is dependent on binding of the transcription factor MEF2, as mutations in the MEF2 binding region result in cytoplasmic accumulation of HDAC4. It is well established that nuclear exit and cytoplasmic retention are dependent on 14-3-3-binding, and mutations that affect binding are widely used to induce nuclear accumulation of HDAC4. While regulation of HDAC4 shuttling is clearly important, there is a gap in understanding of how the nuclear and cytoplasmic distribution of HDAC4 impacts its function. Furthermore, it is unclear whether other features of the protein including the catalytic site, the MEF2-binding region and/or the ankyrin repeat binding motif influence the distribution and/or activity of HDAC4 in neurons. Since HDAC4 functions are conserved in Drosophila, and increased nuclear accumulation of HDAC4 also results in impaired neurodevelopment, we used Drosophila as a genetic model for investigation of HDAC4 function. RESULTS Here we have generated a series of mutants for functional dissection of HDAC4 via in-depth examination of the resulting subcellular distribution and nuclear aggregation, and correlate these with developmental phenotypes resulting from their expression in well-established models of neuronal morphogenesis of the Drosophila mushroom body and eye. We found that in the mushroom body, forced sequestration of HDAC4 in the nucleus or the cytoplasm resulted in defects in axon morphogenesis. The actions of HDAC4 that resulted in impaired development were dependent on the MEF2 binding region, modulated by the ankyrin repeat binding motif, and largely independent of an intact catalytic site. In contrast, disruption to eye development was largely independent of MEF2 binding but mutation of the catalytic site significantly reduced the phenotype, indicating that HDAC4 acts in a neuronal-subtype-specific manner. CONCLUSIONS We found that the impairments to mushroom body and eye development resulting from nuclear accumulation of HDAC4 were exacerbated by mutation of the ankyrin repeat binding motif, whereas there was a differing requirement for the MEF2 binding site and an intact catalytic site. It will be of importance to determine the binding partners of HDAC4 in nuclear aggregates and in the cytoplasm of these tissues to further understand its mechanisms of action.
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Affiliation(s)
- Wei Jun Tan
- School of Natural Sciences, Massey University, Palmerston North, New Zealand
| | - Hannah R Hawley
- School of Natural Sciences, Massey University, Palmerston North, New Zealand
| | - Sarah J Wilson
- School of Natural Sciences, Massey University, Palmerston North, New Zealand
| | - Helen L Fitzsimons
- School of Natural Sciences, Massey University, Palmerston North, New Zealand.
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19
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Ruffman C, Steenbergen KG, Garden AL, Gaston N. Dynamic sampling of liquid metal structures for theoretical studies on catalysis. Chem Sci 2023; 15:185-194. [PMID: 38131068 PMCID: PMC10732005 DOI: 10.1039/d3sc04416e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 11/22/2023] [Indexed: 12/23/2023] Open
Abstract
Liquid metals have recently emerged as promising catalysts that can outcompete their solid counterparts for many reactions. Although theoretical modelling is extensively used to improve solid-state catalysts, there is currently no way to capture the interactions of adsorbates with a dynamic liquid metal. We propose a new approach based on ab initio molecular dynamics sampling of an adsorbate on a liquid catalyst. Using this approach, we describe time-resolved structures for formate adsorbed on liquid Ga-In, and for all intermediates in the methanol oxidation pathway on Ga-Pt. This yields a range of accessible adsorption energies that take into account the at-temperature motion of the liquid metal. We find that a previously proposed pathway for methanol oxidation on Ga-Pt results in unstable intermediates on a dynamic liquid surface, and propose that H desorption must occur during the path. The results showcase a more accurate way to treat liquid metal catalysts in this emerging field.
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Affiliation(s)
- Charlie Ruffman
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Physics, University of Auckland Private Bag 92019 Auckland New Zealand
| | - Krista G Steenbergen
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Physics, School of Chemical and Physical Sciences, Victoria University of Wellington PO Box 600 Wellington 6140 New Zealand
| | - Anna L Garden
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago P.O. Box 56 Dunedin 9054 New Zealand
| | - Nicola Gaston
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Physics, University of Auckland Private Bag 92019 Auckland New Zealand
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20
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Gordon CK, Nass L, Chan S, Davis NJLK. Micellular fluorescence resonance energy transfer based fluorescent ratiometric response to hydrocarbon analytes. LUMINESCENCE 2023. [PMID: 38114325 DOI: 10.1002/bio.4653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 11/16/2023] [Accepted: 11/24/2023] [Indexed: 12/21/2023]
Abstract
Fluorescence resonance energy transfer (FRET) has been utilised to develop numerous selective and sensitive fluorescent ratiometric sensors. Typically, FRET-based fluorescent ratiometric sensors rely on chemical interactions between the sensor and analyte to illicit a response, thus unreactive hydrocarbons are a neglected analyte and a source for new sensors. By containing an unbound donor-acceptor system within micelles, energy transfer is enabled by spatial confinement. This offers the potential of a ratiometric response as a hydrocarbon analyte is added. Introducing a hydrocarbon analyte to this system causes micelles to swell, increasing the donor-acceptor distance and thus reducing the amount of observed energy transfer. We present InP/ZnS quantum dot donors interacting with a Nile Red acceptor, confined by cetyltrimethylammonium bromide (CTAB)-based micelles. We alleviated spatial confinement of the pair within micelles using common laboratory solvents to represent hydrocarbons, (toluene, hexane and octadecene). We constructed calibration curves for each solvent and found effective sensing ranges of 0.009-0.21, 0.008-0.27 and 0.003-0.06 M for toluene, hexane and octadecene, respectively. This study contributes towards the development of new hydrocarbon sensors utilising this new mechanism.
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Affiliation(s)
- Calum K Gordon
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington, New Zealand
- The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago, Dunedin, New Zealand
| | - Liselotte Nass
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
- Debye Institute for Nanomaterials Science, Utrecht University, Utrecht, The Netherlands
| | - Sanutep Chan
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington, New Zealand
- The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago, Dunedin, New Zealand
| | - Nathaniel J L K Davis
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington, New Zealand
- The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago, Dunedin, New Zealand
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21
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Zhao J, Sharma R, Kalyanasundaram A, Kennelly J, Bai J, Li N, Panfilov A, Fedorov VV. Mechanistic insight into the functional role of human sinoatrial node conduction pathways and pacemaker compartments heterogeneity: A computer model analysis. PLoS Comput Biol 2023; 19:e1011708. [PMID: 38109436 PMCID: PMC10760897 DOI: 10.1371/journal.pcbi.1011708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/02/2024] [Accepted: 11/23/2023] [Indexed: 12/20/2023] Open
Abstract
The sinoatrial node (SAN), the primary pacemaker of the heart, is responsible for the initiation and robust regulation of sinus rhythm. 3D mapping studies of the ex-vivo human heart suggested that the robust regulation of sinus rhythm relies on specialized fibrotically-insulated pacemaker compartments (head, center and tail) with heterogeneous expressions of key ion channels and receptors. They also revealed up to five sinoatrial conduction pathways (SACPs), which electrically connect the SAN with neighboring right atrium (RA). To elucidate the role of these structural-molecular factors in the functional robustness of human SAN, we developed comprehensive biophysical computer models of the SAN based on 3D structural, functional and molecular mapping of ex-vivo human hearts. Our key finding is that the electrical insulation of the SAN except SACPs, the heterogeneous expression of If, INa currents and adenosine A1 receptors (A1R) across SAN pacemaker-conduction compartments are required to experimentally reproduce observed SAN activation patterns and important phenomena such as shifts of the leading pacemaker and preferential SACP. In particular, we found that the insulating border between the SAN and RA, is required for robust SAN function and protection from SAN arrest during adenosine challenge. The heterogeneity in the expression of A1R within the human SAN compartments underlies the direction of pacemaker shift and preferential SACPs in the presence of adenosine. Alterations of INa current and fibrotic remodelling in SACPs can significantly modulate SAN conduction and shift the preferential SACP/exit from SAN. Finally, we show that disease-induced fibrotic remodeling, INa suppression or increased adenosine make the human SAN vulnerable to pacing-induced exit blocks and reentrant arrhythmia. In summary, our computer model recapitulates the structural and functional features of the human SAN and can be a valuable tool for investigating mechanisms of SAN automaticity and conduction as well as SAN arrhythmia mechanisms under different pathophysiological conditions.
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Affiliation(s)
- Jichao Zhao
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Roshan Sharma
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Anuradha Kalyanasundaram
- Department of Physiology & Cell Biology, Bob and Corrine Frick Center for Heart Failure and Arrhythmia; The Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - James Kennelly
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Jieyun Bai
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Ning Li
- Department of Physiology & Cell Biology, Bob and Corrine Frick Center for Heart Failure and Arrhythmia; The Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | | | - Vadim V. Fedorov
- Department of Physiology & Cell Biology, Bob and Corrine Frick Center for Heart Failure and Arrhythmia; The Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
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22
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Vahala D, Amos SE, Sacchi M, Soliman BG, Hepburn MS, Mowla A, Li J, Jeong JH, Astell C, Hwang Y, Kennedy BF, Lim KS, Choi YS. 3D Volumetric Mechanosensation of MCF7 Breast Cancer Spheroids in a Linear Stiffness Gradient GelAGE. Adv Healthc Mater 2023; 12:e2301506. [PMID: 37670531 DOI: 10.1002/adhm.202301506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 07/26/2023] [Indexed: 09/07/2023]
Abstract
The tumor microenvironment presents spatiotemporal shifts in biomechanical properties with cancer progression. Hydrogel biomaterials like GelAGE offer the stiffness tuneability to recapitulate dynamic changes in tumor tissues by altering photo-energy exposures. Here, a tuneable hydrogel with spatiotemporal control of stiffness and mesh-network is developed. The volume of MCF7 spheroids encapsulated in a linear stiffness gradient demonstrates an inverse relationship with stiffness (p < 0.0001). As spheroids are exposed to increased crosslinking (stiffer) and greater mechanical confinement, spheroid stiffness increases. Protein expression (TRPV4, β1 integrin, E-cadherin, and F-actin) decreases with increasing stiffness while showing strong correlations to spheroid volume (r2 > 0.9). To further investigate the role of volume, MCF7 spheroids are grown in a soft matrix for 5 days prior to a second polymerisation which presents a stiffness gradient to equally expanded spheroids. Despite being exposed to variable stiffness, these spheroids show even protein expression, confirming volume as a key regulator. Overall, this work showcases the versatility of GelAGE and demonstrates volume expansion as a key regulator of 3D mechanosensation in MCF7 breast cancer spheroids. This platform has the potential to further investigation into the role of stiffness and dimensionality in 3D spheroid culture for other types of cancers and diseases.
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Affiliation(s)
- Danielle Vahala
- School of Human Sciences, The University of Western Australia, Perth, WA, 6009, Australia
| | - Sebastian E Amos
- School of Human Sciences, The University of Western Australia, Perth, WA, 6009, Australia
| | - Marta Sacchi
- School of Human Sciences, The University of Western Australia, Perth, WA, 6009, Australia
| | - Bram G Soliman
- Department of Orthopaedic Surgery and Musculoskeletal Medicine, University of Otago Christchurch, Christchurch, 8140, New Zealand
| | - Matt S Hepburn
- Department of Electrical, Electronic & Computer Engineering, School of Engineering, The University of Western Australia, Perth, WA, 6009, Australia
- BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, and Centre for Medical Research, The University of Western Australia, Perth, WA, 6009, Australia
| | - Alireza Mowla
- Department of Electrical, Electronic & Computer Engineering, School of Engineering, The University of Western Australia, Perth, WA, 6009, Australia
- BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, and Centre for Medical Research, The University of Western Australia, Perth, WA, 6009, Australia
| | - Jiayue Li
- Department of Electrical, Electronic & Computer Engineering, School of Engineering, The University of Western Australia, Perth, WA, 6009, Australia
- BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, and Centre for Medical Research, The University of Western Australia, Perth, WA, 6009, Australia
| | - Ji Hoon Jeong
- Soonchunhyang Institute of Medi-Bio Science, Soonchunhyang University, Cheonan-si, Chungcheongnam-do, 31151, South Korea
| | - Chrissie Astell
- School of Human Sciences, The University of Western Australia, Perth, WA, 6009, Australia
| | - Yongsung Hwang
- Soonchunhyang Institute of Medi-Bio Science, Soonchunhyang University, Cheonan-si, Chungcheongnam-do, 31151, South Korea
| | - Brendan F Kennedy
- Department of Electrical, Electronic & Computer Engineering, School of Engineering, The University of Western Australia, Perth, WA, 6009, Australia
- BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, and Centre for Medical Research, The University of Western Australia, Perth, WA, 6009, Australia
| | - Khoon S Lim
- Department of Orthopaedic Surgery and Musculoskeletal Medicine, University of Otago Christchurch, Christchurch, 8140, New Zealand
- School of Medical Sciences, University of Sydney, Sydney, NSW, 2006, Australia
| | - Yu Suk Choi
- School of Human Sciences, The University of Western Australia, Perth, WA, 6009, Australia
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23
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Soliman BG, Longoni A, Major GS, Lindberg GCJ, Choi YS, Zhang YS, Woodfield TBF, Lim KS. Harnessing Macromolecular Chemistry to Design Hydrogel Micro- and Macro-Environments. Macromol Biosci 2023:e2300457. [PMID: 38035637 DOI: 10.1002/mabi.202300457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 11/16/2023] [Indexed: 12/02/2023]
Abstract
Cell encapsulation within three-dimensional hydrogels is a promising approach to mimic tissues. However, true biomimicry of the intricate microenvironment, biophysical and biochemical gradients, and the macroscale hierarchical spatial organizations of native tissues is an unmet challenge within tissue engineering. This review provides an overview of the macromolecular chemistries that have been applied toward the design of cell-friendly hydrogels, as well as their application toward controlling biophysical and biochemical bulk and gradient properties of the microenvironment. Furthermore, biofabrication technologies provide the opportunity to simultaneously replicate macroscale features of native tissues. Biofabrication strategies are reviewed in detail with a particular focus on the compatibility of these strategies with the current macromolecular toolkit described for hydrogel design and the challenges associated with their clinical translation. This review identifies that the convergence of the ever-expanding macromolecular toolkit and technological advancements within the field of biofabrication, along with an improved biological understanding, represents a promising strategy toward the successful tissue regeneration.
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Affiliation(s)
- Bram G Soliman
- School of Materials Science and Engineering, University of New South Wales, Sydney, 2052, Australia
| | - Alessia Longoni
- Department of Orthopedics, University Medical Center Utrecht, Utrecht, 3584CX, The Netherlands
| | - Gretel S Major
- Department of Orthopedic Surgery and Musculoskeletal Medicine, University of Otago, Christchurch, 8011, New Zealand
| | - Gabriella C J Lindberg
- Phil and Penny Knight Campus for Accelerating Scientific Impact Department of Bioengineering, University of Oregon, Eugene, OR, 97403, USA
| | - Yu Suk Choi
- School of Human Sciences, The University of Western Australia, Perth, 6009, Australia
| | - Yu Shrike Zhang
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, 02115, USA
| | - Tim B F Woodfield
- Department of Orthopedic Surgery and Musculoskeletal Medicine, University of Otago, Christchurch, 8011, New Zealand
| | - Khoon S Lim
- Department of Orthopedic Surgery and Musculoskeletal Medicine, University of Otago, Christchurch, 8011, New Zealand
- School of Medical Sciences, University of Sydney, Sydney, 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, 2006, Australia
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Latai-Niusulu A, Tsujita M, Neef A. Climate micro-mobilities as adaptation practice in the Pacific: the case of Samoa. Philos Trans R Soc Lond B Biol Sci 2023; 378:20220392. [PMID: 37718607 PMCID: PMC10505846 DOI: 10.1098/rstb.2022.0392] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 04/27/2023] [Indexed: 09/19/2023] Open
Abstract
Recent debates on climate mobilities have largely ignored the dynamics of mobility patterns including short-distance and short-duration circular movements to enhance adaptative capacity and resilience of households and individuals, enabling them to remain in place despite facing increasingly severe climatic risks. This paper explores Pacific Islanders' climate-related mobilities with reference to cases from Samoa. It first conceptualizes Samoan mobility, which is rooted in Samoan culture, norms and worldviews, and then uses this as a framework to examine ways in which people shift and diversify their residential locations for climate-associated reasons. The study employs a comparative case study approach using conversational (the Pacific-originated talanoa-style) interviews with 40 participants in two villages in Samoa-one urban and the other rural. Findings suggest that shifting spatially and temporarily between two residences (a practice called fa'a-'āigalua) occurs not only within the village but across villages. Thereby, villagers reduce the risk of incurring physical harm from climate-related disasters, while minimizing the risk of cultural harm from place detachment. Our study challenges the discourse of 'vulnerable Pacific Islanders' by demonstrating the adaptability of Samoans to changing socio-ecological and climatic circumstances and their ability to develop a variety of climate resilience strategies, including micro-mobilities and circular migration. This article is part of the theme issue 'Climate change adaptation needs a science of culture'.
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Affiliation(s)
- Anita Latai-Niusulu
- Department of Social Sciences, National University of Samoa, Apia, PO Box 2279, Samoa
| | - Masami Tsujita
- Development Studies Programme, Centre for Samoan Studies, National University of Samoa, Apia, PO Box 2279, Samoa
| | - Andreas Neef
- Development Studies, School of Social Sciences, The University of Auckland, Auckland 1142, New Zealand
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McCallum E, Shaw RC. Repeatability and heritability of inhibitory control performance in wild toutouwai ( Petroica longipes). R Soc Open Sci 2023; 10:231476. [PMID: 38026029 PMCID: PMC10646466 DOI: 10.1098/rsos.231476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 10/25/2023] [Indexed: 12/01/2023]
Abstract
Despite increasing interest in the evolution of inhibitory control, few studies have examined the validity of widespread testing paradigms, the long-term repeatability and the heritability of this cognitive ability in the wild. We investigated these aspects in the inhibitory control performance of wild toutouwai (North Island robin; Petroica longipes), using detour and reversal learning tasks. We assessed convergent validity by testing whether individual performance correlated across detour and reversal learning tasks. We then further evaluated task validity by examining whether individual performance was confounded by non-cognitive factors. We tested a subset of subjects twice in each task to estimate the repeatability of performance across a 1-year period. Finally, we used a population pedigree to estimate the heritability of task performance. Individual performance was unrelated across detour and reversal learning tasks, indicating that these measured different cognitive abilities. Task performance was not influenced by body condition, boldness or prior experience, and showed moderate between-year repeatability. Yet despite this individual consistency, we found no evidence that task performance was heritable. Our findings suggest that detour and reversal learning tasks measure consistent individual differences in distinct forms of inhibitory control in toutouwai, but this variation may be environmentally determined rather than genetic.
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Affiliation(s)
- Ella McCallum
- School of Biological Sciences, Te Herenga Waka Victoria University of Wellington, Wellington, New Zealand
| | - Rachael C. Shaw
- School of Biological Sciences, Te Herenga Waka Victoria University of Wellington, Wellington, New Zealand
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26
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Farnworth B, Purdie S, Wehi PM, Painting CJ. Exaggerated mandibles are correlated with enhanced foraging efficacy in male Auckland tree wētā. Biol Lett 2023; 19:20230207. [PMID: 37964578 PMCID: PMC10646448 DOI: 10.1098/rsbl.2023.0207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 10/23/2023] [Indexed: 11/16/2023] Open
Abstract
Sexual selection has driven the evolution of weaponry for males to fight rivals to gain access to females. Although weapons are predicted to increase males' reproductive success, they are also expected to incur costs and may impair functional activities, including foraging. Using feeding assays, we tested whether the enlarged mandibles of Auckland tree wētā (Hemideina thoracica) impact feeding activity (the total volume of biomass consumed, bite rate, and number of foraging visits) and foraging behaviour (time spent moving, feeding, or stationary). We predicted that increased head capsule size in male wētā would hinder their foraging efficacy. However, we found that wētā with longer heads fed at a faster rate and spent less time foraging than wētā with smaller heads, regardless of sex. Contrary to expectations that weapons impede functional activities, our results demonstrate that exaggerated traits can improve feeding performance and may offer benefits other than increased mating success.
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Affiliation(s)
| | | | | | - Christina J. Painting
- Te Aka Mātuatua School of Science, University of Waikato, Hamilton 3240, New Zealand
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27
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Banerjee S, Ballmann GM, Evans MJ, O'Reilly A, Kennedy AR, Fulton JR, Coles MP, Mulvey RE. Three Oxidative Addition Routes of Alkali Metal Aluminyls to Dihydridoaluminates and Reactivity with CO 2. Chemistry 2023; 29:e202301849. [PMID: 37429823 DOI: 10.1002/chem.202301849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 07/08/2023] [Accepted: 07/10/2023] [Indexed: 07/12/2023]
Abstract
Three distinct routes are reported to the soluble, dihydridoaluminate compounds, AM[Al(NONDipp )(H)2 ] (AM=Li, Na, K, Rb, Cs; [NONDipp ]2- =[O(SiMe2 NDipp)2 ]2- ; Dipp=2,6-iPr2 C6 H3 ) starting from the alkali metal aluminyls, AM[Al(NONDipp )]. Direct H2 hydrogenation of the heavier analogues (AM=Rb, Cs) produced the first examples of structurally characterized rubidium and caesium dihydridoaluminates, although harsh conditions were required for complete conversion. Using 1,4-cyclohexadiene (1,4-CHD) as an alternative hydrogen source in transfer hydrogenation reactions provided a lower energy pathway to the full series of products for AM=Li-Cs. A further moderation in conditions was noted for the thermal decomposition of the (silyl)(hydrido)aluminates, AM[Al(NONDipp )(H)(SiH2 Ph)]. Probing the reaction of Cs[Al(NONDipp )] with 1,4-CHD provided access to a novel inverse sandwich complex, [{Cs(Et2 O)}2 {Al(NONDipp )(H)}2 (C6 H6 )], containing the 1,4-dialuminated [C6 H6 ]2- dianion and representing the first time that an intermediate in the commonly utilized oxidation process of 1,4-CHD to benzene has been trapped. The synthetic utility of the newly installed Al-H bonds has been demonstrated by their ability to reduce CO2 under mild conditions to form the bis-formate AM[Al(NONDipp )(O2 CH)2 ] compounds, which exhibit a diverse series of eyecatching bimetallacyclic structures.
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Affiliation(s)
- Sumanta Banerjee
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, G1 1XL, Glasgow, UK
| | - Gerd M Ballmann
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, G1 1XL, Glasgow, UK
| | - Matthew J Evans
- School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, 6140, New Zealand
| | - Andrea O'Reilly
- School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, 6140, New Zealand
| | - Alan R Kennedy
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, G1 1XL, Glasgow, UK
| | - J Robin Fulton
- School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, 6140, New Zealand
| | - Martyn P Coles
- School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, 6140, New Zealand
| | - Robert E Mulvey
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, G1 1XL, Glasgow, UK
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Garea SS, Sauer JD, Hall LC, Williams MN, Drummond A. The potential relationship between loot box spending, problem gambling, and obsessive-compulsive gamers. J Behav Addict 2023; 12:733-743. [PMID: 37594878 PMCID: PMC10562816 DOI: 10.1556/2006.2023.00038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 06/28/2023] [Accepted: 07/08/2023] [Indexed: 08/20/2023] Open
Abstract
Background and Aims Loot boxes are digital containers of randomised rewards available in many video games. Individuals with problem gambling symptomatology spend more on loot boxes than individuals without such symptoms. This study investigated whether other psychopathological symptomatology, specifically symptoms of obsessive-compulsive behaviour and hoarding may also be associated with increased loot box spending. Methods In a large cross-sectional, cross-national survey (N = 1,049 after exclusions), participants recruited from Prolific, living in Aotearoa New Zealand, Australia, and the United States, provided self-reported loot box spending, obsessive-compulsive and hoarding symptomatology, problem gambling symptomatology, and consumer regret levels. Results There was a moderate positive relationship between loot box spending and obsessive-compulsive symptoms and hoarding. Additionally, greater purchasing of loot boxes was associated with increased consumer regret. Discussion and Conclusion Results identified that those with OCD and hoarding symptomatology may spend more on loot boxes than individuals without OCD and hoarding symptomatology. This information helps identify disproportionate spending to more groups of vulnerable players and may assist in helping consumers make informed choices and also aid policy discussions around the potentialities of harm.
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Affiliation(s)
- Shaun S. Garea
- School of Psychology, Massey University, Palmerston North 4424, Manawatu, New Zealand
| | - James D. Sauer
- School of Psychological Sciences, University of Tasmania, Australia
| | - Lauren C. Hall
- School of Psychology, Massey University, Palmerston North 4424, Manawatu, New Zealand
| | - Matt N. Williams
- School of Psychology, Massey University, Palmerston North 4424, Manawatu, New Zealand
| | - Aaron Drummond
- School of Psychology, Massey University, Palmerston North 4424, Manawatu, New Zealand
- School of Psychological Sciences, University of Tasmania, Australia
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29
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van Eyndhoven F, Cameron EZ, Flanagan SP. High rates of male courtship in a female-ornamented pipefish. R Soc Open Sci 2023; 10:231428. [PMID: 37885981 PMCID: PMC10598436 DOI: 10.1098/rsos.231428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 10/04/2023] [Indexed: 10/28/2023]
Abstract
In species with sex-specific signalling traits that appear to be ornamental (i.e. are conspicuous and with no obvious natural selection benefit), the ornamented sex typically initiates courtship and is most active in courtship. Here, we report for the first time courtship displays in the extremely sexually dimorphic, female-ornamented wide-bodied pipefish (Stigmatopora nigra), revealing unexpected behaviours. Females use their sex-specific ornament during courtship displays, as expected, but rarely in female-female interactions. Surprisingly, males initiated 61% of reciprocated courtship bouts and chased females in 17% of the bouts. This chasing behaviour could be a form of male harassment or be indicative of female disinterest in ardent males, either of which was unexpected to be found in this female-ornamented species. Our results highlight the need to study the details of species' behaviours in considering the potential roles of sexual selection and sexual conflict in shaping sexual dimorphism.
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Affiliation(s)
- Fleur van Eyndhoven
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
| | - Elissa Z. Cameron
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
| | - Sarah P. Flanagan
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
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30
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Devaux JBL, Hickey AJR, Renshaw GMC. Succinate-mediated reactive oxygen species production in the anoxia-tolerant epaulette ( Hemiscyllium ocellatum) and grey carpet ( Chiloscyllium punctatum) sharks. Biol Lett 2023; 19:20230344. [PMID: 37817574 PMCID: PMC10565405 DOI: 10.1098/rsbl.2023.0344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 09/22/2023] [Indexed: 10/12/2023] Open
Abstract
Anoxia/re-oxygenation (AR) results in elevated unchecked oxidative stress and mediates irreversible damage within the brain for most vertebrates. Succinate accumulation within mitochondria of the ischaemic brain appears to increase the production of reactive oxygen species (ROS) upon re-oxygenation. Two closely related elasmobranchs, the epaulette shark (Hemiscyllium ocellatum) and the grey carpet shark (Chiloscyllium punctatum) repeatedly experience near anoxia and re-oxygenation in their habitats and have adapted to survive AR at tropical temperatures without significant brain injuries. However, these anoxia-tolerant species display contrasting strategies to survive AR, with only H. ocellatum having the capacity to supress metabolism and H. ocellatum mitochondria the capacity to depress succinate oxidation post-AR. We measured oxygen consumption alongside ROS production mediated by elevated succinate in mitochondria of permeabilized cerebellum from both shark species. Although mitochondrial respiration remained similar for both species, the ROS production in H. ocellatum was half that of C. punctatum in phosphorylating and non-phosphorylating mitochondria. Maximum ROS production in H. ocellatum was mediated by succinate loads 10-fold higher than in C. punctatum mitochondria. The contrasting survival strategies of anoxia-tolerant sharks reveal the significance of mitigating ROS production under elevated succinate load during AR, shedding light on potential mechanisms to mitigate brain injury.
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Affiliation(s)
- Jules B. L. Devaux
- School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand
| | - Anthony J. R. Hickey
- School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand
| | - Gillian M. C. Renshaw
- Hypoxia and Ischemia Research Unit School of Allied Health Sciences, Griffith University, Gold Coast campus, Queensland 4222, Australia
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31
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Matthee A, Aghababaie Z, Simmonds S, Dowrick JM, Nisbet LA, Sands GB, Angeli-Gordon TR. Power-Controlled, Irrigated Radio-Frequency Ablation of Gastric Tissue: A Biophysical Analysis of Lesion Formation. Dig Dis Sci 2023; 68:3953-3962. [PMID: 37587256 PMCID: PMC10517039 DOI: 10.1007/s10620-023-08079-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 08/04/2023] [Indexed: 08/18/2023]
Abstract
BACKGROUND Radio-frequency ablation of gastric tissue is in its infancy compared to its extensive history and use in the cardiac field. AIMS We employed power-controlled, irrigated radio-frequency ablation to create lesions on the serosal surface of the stomach to examine the impact of ablation power, irrigation, temperature, and impedance on lesion formation and tissue damage. METHODS A total of 160 lesions were created in vivo in female weaner pigs (n = 5) using a combination of four power levels (10, 15, 20, 30 W) at two irrigation rates (2, 5 mL min-1) and with one temperature-controlled (65 °C) reference setting previously validated for electrophysiological intervention in the stomach. RESULTS Power and irrigation rate combinations above 15 W resulted in lesions with significantly higher surface area and depth than the temperature-controlled setting. Irrigation resulted in significantly lower temperature (p < 0.001) and impedance (p < 0.001) compared to the temperature-controlled setting. No instances of perforation or tissue pop were recorded for any ablation sequence. CONCLUSION Power-controlled, irrigated radio-frequency ablation of gastric tissue is effective in creating larger and deeper lesions at reduced temperatures than previously investigated temperature-controlled radio-frequency ablation, highlighting a substantial improvement. These data define the biophysical impact of ablation parameters in gastric tissue, and they will guide future translation toward clinical application and in silico gastric ablation modeling. Combination of ablation settings (10-30 W power, 2-5 mL min-1 irrigation) were used to create serosal spot lesions. Histological analysis of lesions quantified localized tissue damage.
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Affiliation(s)
- Ashton Matthee
- Auckland Bioengineering Institute, University of Auckland, Private Bag, 92019, Auckland, New Zealand
| | - Zahra Aghababaie
- Auckland Bioengineering Institute, University of Auckland, Private Bag, 92019, Auckland, New Zealand
| | - Sam Simmonds
- Auckland Bioengineering Institute, University of Auckland, Private Bag, 92019, Auckland, New Zealand
| | - Jarrah M Dowrick
- Auckland Bioengineering Institute, University of Auckland, Private Bag, 92019, Auckland, New Zealand
| | - Linley A Nisbet
- Auckland Bioengineering Institute, University of Auckland, Private Bag, 92019, Auckland, New Zealand
| | - Gregory B Sands
- Auckland Bioengineering Institute, University of Auckland, Private Bag, 92019, Auckland, New Zealand
| | - Timothy R Angeli-Gordon
- Auckland Bioengineering Institute, University of Auckland, Private Bag, 92019, Auckland, New Zealand.
- Department of Surgery, University of Auckland, Auckland, New Zealand.
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32
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Yassi M, Chatterjee A, Parry M. Application of deep learning in cancer epigenetics through DNA methylation analysis. Brief Bioinform 2023; 24:bbad411. [PMID: 37985455 PMCID: PMC10661960 DOI: 10.1093/bib/bbad411] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 10/08/2023] [Accepted: 10/25/2023] [Indexed: 11/22/2023] Open
Abstract
DNA methylation is a fundamental epigenetic modification involved in various biological processes and diseases. Analysis of DNA methylation data at a genome-wide and high-throughput level can provide insights into diseases influenced by epigenetics, such as cancer. Recent technological advances have led to the development of high-throughput approaches, such as genome-scale profiling, that allow for computational analysis of epigenetics. Deep learning (DL) methods are essential in facilitating computational studies in epigenetics for DNA methylation analysis. In this systematic review, we assessed the various applications of DL applied to DNA methylation data or multi-omics data to discover cancer biomarkers, perform classification, imputation and survival analysis. The review first introduces state-of-the-art DL architectures and highlights their usefulness in addressing challenges related to cancer epigenetics. Finally, the review discusses potential limitations and future research directions in this field.
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Affiliation(s)
- Maryam Yassi
- Department of Mathematics and Statistics, University of Otago, Dunedin, New Zealand
- Department of Pathology, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Aniruddha Chatterjee
- Department of Pathology, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
- Honorary Professor, UPES University, Dehradun, India
| | - Matthew Parry
- Department of Mathematics and Statistics, University of Otago, Dunedin, New Zealand
- Te Pūnaha Matatini Centre of Research Excellence, University of Auckland, Auckland, New Zealand
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Coker SJ, Dyson RM, Smith-Díaz CC, Vissers MCM, Berry MJ. Effects of Low Vitamin C Intake on Fertility Parameters and Pregnancy Outcomes in Guinea Pigs. Nutrients 2023; 15:4107. [PMID: 37836389 PMCID: PMC10574174 DOI: 10.3390/nu15194107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 09/21/2023] [Accepted: 09/21/2023] [Indexed: 10/15/2023] Open
Abstract
Identifying how specific nutrients can impact fertility, pregnancy, and neonatal outcomes will yield important insights into the biological mechanisms linking diet and reproductive health. Our study investigates how dietary vitamin C intake affects various fertility parameters and pregnancy and neonatal outcomes in the guinea pig, a natural model of vitamin C dependency. Dunkin Hartley guinea pigs were fed an optimal (900 mg/kg feed) or low (100 mg/kg feed) vitamin C diet ad libitum for at least three weeks prior to mating and throughout pregnancy. We found that animals receiving the low vitamin C diet had an increased number of unsuccessful matings, a higher incidence of foetal reabsorption, and, among pregnancies resulting in delivery at term, produced fewer offspring. Neonates from mothers on the low vitamin C diet had significantly decreased plasma vitamin C concentrations at birth and exhibited mild growth impairments in a sex-dependent manner. We conclude that a diet low of vitamin C induces a state of subfertility, reduces overall fecundity, and adversely impacts both pregnancy outcomes and growth in the offspring. Our study provides an essential foundation for future investigations to determine whether these findings translate to humans. If so, they could have important clinical implications for assisted reproductive technologies and nutritional recommendations for couples trying to conceive, pregnant women, and breastfeeding mothers.
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Affiliation(s)
- Sharna J. Coker
- Perinatal and Developmental Physiology Group, Department of Paediatrics and Child Health, University of Otago, Wellington 6242, New Zealand; (S.J.C.); (R.M.D.)
| | - Rebecca M. Dyson
- Perinatal and Developmental Physiology Group, Department of Paediatrics and Child Health, University of Otago, Wellington 6242, New Zealand; (S.J.C.); (R.M.D.)
| | - Carlos C. Smith-Díaz
- Mātai Hāora—Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch 8140, New Zealand;
| | - Margreet C. M. Vissers
- Mātai Hāora—Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch 8140, New Zealand;
| | - Mary J. Berry
- Perinatal and Developmental Physiology Group, Department of Paediatrics and Child Health, University of Otago, Wellington 6242, New Zealand; (S.J.C.); (R.M.D.)
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Fernandes A, Williamson A, Matias PM, Moe E. Structure/function studies of the NAD +-dependent DNA ligase from the poly-extremophile Deinococcus radiodurans reveal importance of the BRCT domain for DNA binding. Extremophiles 2023; 27:26. [PMID: 37712998 PMCID: PMC10504179 DOI: 10.1007/s00792-023-01309-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 08/21/2023] [Indexed: 09/16/2023]
Abstract
Bacterial NAD+-dependent DNA ligases (LigAs) are enzymes involved in replication, recombination, and DNA-repair processes by catalyzing the formation of phosphodiester bonds in the backbone of DNA. These multidomain proteins exhibit four modular domains, that are highly conserved across species, with the BRCT (breast cancer type 1 C-terminus) domain on the C-terminus of the enzyme. In this study, we expressed and purified both recombinant full-length and a C-terminally truncated LigA from Deinococcus radiodurans (DrLigA and DrLigA∆BRCT) and characterized them using biochemical and X-ray crystallography techniques. Using seeds of DrLigA spherulites, we obtained ≤ 100 µm plate crystals of DrLigA∆BRCT. The crystal structure of the truncated protein was obtained at 3.4 Å resolution, revealing DrLigA∆BRCT in a non-adenylated state. Using molecular beacon-based activity assays, we demonstrated that DNA ligation via nick sealing remains unaffected in the truncated DrLigA∆BRCT. However, DNA-binding assays revealed a reduction in the affinity of DrLigA∆BRCT for dsDNA. Thus, we conclude that the flexible BRCT domain, while not critical for DNA nick-joining, plays a role in the DNA binding process, which may be a conserved function of the BRCT domain in LigA-type DNA ligases.
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Affiliation(s)
- Andreia Fernandes
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA de Lisboa, Oeiras, Portugal
| | - Adele Williamson
- Department of Chemistry, UiT-The Arctic University of Norway, Tromsø, Norway
- School of Science, University of Waikato, Hamilton, New Zealand
| | - Pedro M Matias
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA de Lisboa, Oeiras, Portugal
- Institute of Experimental and Technological Biology (IBET), Oeiras, Portugal
| | - Elin Moe
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA de Lisboa, Oeiras, Portugal.
- Department of Chemistry, UiT-The Arctic University of Norway, Tromsø, Norway.
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Wisnoski NI, Andrade R, Castorani MCN, Catano CP, Compagnoni A, Lamy T, Lany NK, Marazzi L, Record S, Smith AC, Swan CM, Tonkin JD, Voelker NM, Zarnetske PL, Sokol ER. Diversity-stability relationships across organism groups and ecosystem types become decoupled across spatial scales. Ecology 2023; 104:e4136. [PMID: 37401548 DOI: 10.1002/ecy.4136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 06/09/2023] [Accepted: 06/15/2023] [Indexed: 07/05/2023]
Abstract
The relationship between biodiversity and stability, or its inverse, temporal variability, is multidimensional and complex. Temporal variability in aggregate properties, like total biomass or abundance, is typically lower in communities with higher species diversity (i.e., the diversity-stability relationship [DSR]). At broader spatial extents, regional-scale aggregate variability is also lower with higher regional diversity (in plant systems) and with lower spatial synchrony. However, focusing exclusively on aggregate properties of communities may overlook potentially destabilizing compositional shifts. It is not yet clear how diversity is related to different components of variability across spatial scales, nor whether regional DSRs emerge across a broad range of organisms and ecosystem types. To test these questions, we compiled a large collection of long-term metacommunity data spanning a wide range of taxonomic groups (e.g., birds, fish, plants, invertebrates) and ecosystem types (e.g., deserts, forests, oceans). We applied a newly developed quantitative framework for jointly analyzing aggregate and compositional variability across scales. We quantified DSRs for composition and aggregate variability in local communities and metacommunities. At the local scale, more diverse communities were less variable, but this effect was stronger for aggregate than compositional properties. We found no stabilizing effect of γ-diversity on metacommunity variability, but β-diversity played a strong role in reducing compositional spatial synchrony, which reduced regional variability. Spatial synchrony differed among taxa, suggesting differences in stabilization by spatial processes. However, metacommunity variability was more strongly driven by local variability than by spatial synchrony. Across a broader range of taxa, our results suggest that high γ-diversity does not consistently stabilize aggregate properties at regional scales without sufficient spatial β-diversity to reduce spatial synchrony.
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Affiliation(s)
- Nathan I Wisnoski
- Department of Biological Sciences, Mississippi State University, Mississippi State, Mississippi, USA
- Wyoming Geographic Information Science Center, University of Wyoming, Laramie, Wyoming, USA
- Department of Biology, Indiana University, Bloomington, Indiana, USA
| | - Riley Andrade
- Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
- Department of Wildlife Ecology and Conservation, University of Florida, Gainesville, Florida, USA
| | - Max C N Castorani
- Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia, USA
| | - Christopher P Catano
- Department of Plant Biology, Michigan State University, East Lansing, Michigan, USA
| | - Aldo Compagnoni
- Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Thomas Lamy
- Marine Science Institute, University of California, Santa Barbara, Santa Barbara, California, USA
- MARBEC, University of Montpellier, CNRS, Ifremer, IRD, Montpellier, France
| | - Nina K Lany
- Northern Research Station, Forest Service, US Department of Agriculture (USDA), Durham, New Hampshire, USA
| | - Luca Marazzi
- Institute of Environment, Florida International University, Miami, Florida, USA
- Thames21, London, UK
| | - Sydne Record
- Department of Biology, Bryn Mawr College, Bryn Mawr, Pennsylvania, USA
- Department of Wildlife, Fisheries, and Conservation Biology, University of Maine, Orono, Maine, USA
| | - Annie C Smith
- Department of Forestry, Michigan State University, East Lansing, Michigan, USA
- Ecology, Evolution, and Behavior Program, Michigan State University, East Lansing, Michigan, USA
- Department of Integrative Biology, Michigan State University, East Lansing, Michigan, USA
- Washington State Department of Natural Resources, Olympia, Washington, USA
| | - Christopher M Swan
- Department of Geography and Environmental Systems, University of Maryland, Baltimore, Maryland, USA
| | - Jonathan D Tonkin
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
- Te Pūnaha Matatini Centre of Research Excellence, University of Canterbury, Christchurch, New Zealand
- Bioprotection Aotearoa Centre of Research Excellence, University of Canterbury, Christchurch, New Zealand
| | - Nicole M Voelker
- Department of Geography and Environmental Systems, University of Maryland, Baltimore, Maryland, USA
| | - Phoebe L Zarnetske
- Ecology, Evolution, and Behavior Program, Michigan State University, East Lansing, Michigan, USA
- Department of Integrative Biology, Michigan State University, East Lansing, Michigan, USA
| | - Eric R Sokol
- National Ecological Observatory Network (NEON), Boulder, Colorado, USA
- Institute of Arctic and Alpine Research (INSTAAR), University of Colorado, Boulder, Colorado, USA
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Aghababaie Z, Wang THH, Nisbet LA, Matthee A, Dowrick J, Sands GB, Paskaranandavadivel N, Cheng LK, O'Grady G, Angeli-Gordon TR. Anaesthesia by intravenous propofol reduces the incidence of intra-operative gastric electrical slow-wave dysrhythmias compared to isoflurane. Sci Rep 2023; 13:11824. [PMID: 37479717 PMCID: PMC10362009 DOI: 10.1038/s41598-023-38612-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 07/11/2023] [Indexed: 07/23/2023] Open
Abstract
Gastric motility is coordinated by bioelectrical slow-wave activity, and abnormal electrical dysrhythmias have been associated with nausea and vomiting. Studies have often been conducted under general anaesthesia, while the impact of general anaesthesia on slow-wave activity has not been studied. Clinical studies have shown that propofol anaesthesia reduces postoperative nausea and vomiting (PONV) compared with isoflurane, while the underlying mechanisms remain unclear. In this study, we investigated the effects of two anaesthetic drugs, intravenous (IV) propofol and volatile isoflurane, on slow-wave activity. In vivo experiments were performed in female weaner pigs (n = 24). Zolazepam and tiletamine were used to induce general anaesthesia, which was maintained using either IV propofol (n = 12) or isoflurane (n = 12). High-resolution electrical mapping of slow-wave activity was performed. Slow-wave dysrhythmias occurred less often in the propofol group, both in the duration of the recorded period that was dysrhythmic (propofol 14 ± 26%, isoflurane 43 ± 39%, P = 0.043 (Mann-Whitney U test)), and in a case-by-case basis (propofol 3/12, isoflurane 8/12, P = 0.015 (Chi-squared test)). Slow-wave amplitude was similar, while velocity and frequency were higher in the propofol group than the isoflurane group (P < 0.001 (Student's t-test)). This study presents a potential physiological biomarker linked to recent observations of reduced PONV with IV propofol. The results suggest that propofol is a more suitable anaesthetic for studying slow-wave patterns in vivo.
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Affiliation(s)
- Zahra Aghababaie
- Auckland Bioengineering Institute, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Tim Hsu-Han Wang
- Department of Surgery, University of Auckland, Auckland, New Zealand
| | - Linley A Nisbet
- Auckland Bioengineering Institute, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Ashton Matthee
- Auckland Bioengineering Institute, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Jarrah Dowrick
- Auckland Bioengineering Institute, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Gregory B Sands
- Auckland Bioengineering Institute, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | | | - Leo K Cheng
- Auckland Bioengineering Institute, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Gregory O'Grady
- Auckland Bioengineering Institute, University of Auckland, Private Bag 92019, Auckland, New Zealand
- Department of Surgery, University of Auckland, Auckland, New Zealand
| | - Timothy R Angeli-Gordon
- Auckland Bioengineering Institute, University of Auckland, Private Bag 92019, Auckland, New Zealand.
- Department of Surgery, University of Auckland, Auckland, New Zealand.
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Fiedler H, Malone N, Mitchell DRG, Nancarrow M, Jovic V, Waterhouse GIN, Kennedy J, Gupta P. Room Temperature Ion Beam Synthesis of Ultra-Fine Molybdenum Carbide Nanoparticles: Toward a Scalable Fabrication Route for Earth-Abundant Electrodes. Small 2023:e2304118. [PMID: 37438619 DOI: 10.1002/smll.202304118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/29/2023] [Indexed: 07/14/2023]
Abstract
Molybdenum carbides are promising low-cost electrocatalysts for electrolyzers, fuel cells, and batteries. However, synthesis of ultrafine, phase-pure carbide nanoparticles (diameter < 5 nm) with large surface areas remains challenging due to uncontrollable agglomeration that occurs during traditional high temperature syntheses. This work presents a scalable, physical approach to synthesize molybdenum carbide nanoparticles at room temperature by ion implantation. By tuning the implantation conditions, various molybdenum carbide phases, stoichiometries, and nanoparticle sizes can be accessed. For instance, molybdenum ion implantation into glassy carbon at 30 keV energy and to a fluence of 9 × 1016 at cm-2 yields a surface η-Mo3 C2 with a particle diameter of (10 ± 1) nm. Molybdenum implantation into glassy carbon at 60 keV to a fluence of 6 × 1016 at cm-2 yields a buried layer of ultrafine γ'-MoC/η-MoC nanoparticles. Carbon ion implantation at 20 keV into a molybdenum thin film produces a 40 nm thick layer primarily composed of β-Mo2 C. The formation of nanoparticles in each molybdenum carbide phase is explained based on the Mo-C phase diagram and Monte-Carlo simulations of ion-solid interactions invoking the thermal spike model. The approaches presented are widely applicable for synthesis of other transition metal carbide nanoparticles as well.
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Grants
- C05X1905 New Zealand Ministry for Business, Innovation, and Employment
- CO5X1702 New Zealand Ministry for Business, Innovation, and Employment
- MFP-GNS2201 Royal Society Te Apārangi
- LE120100104 Australian Research Council (ARC)-Linkage, Infrastructure, Equipment, and Facilities (LIEF)
- LE160100063 Australian Research Council (ARC)-Linkage, Infrastructure, Equipment, and Facilities (LIEF)
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Affiliation(s)
- Holger Fiedler
- National Isotope Centre, GNS Science, 30 Gracefield Road, Lower Hutt, 5010, New Zealand
| | - Niall Malone
- National Isotope Centre, GNS Science, 30 Gracefield Road, Lower Hutt, 5010, New Zealand
- School of Chemical Sciences, The University of Auckland, Auckland, 1010, New Zealand
| | - David R G Mitchell
- Electron Microscopy Centre, University of Wollongong, Innovation Campus, Squires Way, Wollongong, 2519, Australia
| | - Mitchell Nancarrow
- Electron Microscopy Centre, University of Wollongong, Innovation Campus, Squires Way, Wollongong, 2519, Australia
| | - Vedran Jovic
- National Isotope Centre, GNS Science, 30 Gracefield Road, Lower Hutt, 5010, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and, Physical Sciences, Victoria University of Wellington, Wellington, 6040, New Zealand
| | - Geoffrey I N Waterhouse
- School of Chemical Sciences, The University of Auckland, Auckland, 1010, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and, Physical Sciences, Victoria University of Wellington, Wellington, 6040, New Zealand
| | - John Kennedy
- National Isotope Centre, GNS Science, 30 Gracefield Road, Lower Hutt, 5010, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and, Physical Sciences, Victoria University of Wellington, Wellington, 6040, New Zealand
| | - Prasanth Gupta
- National Isotope Centre, GNS Science, 30 Gracefield Road, Lower Hutt, 5010, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and, Physical Sciences, Victoria University of Wellington, Wellington, 6040, New Zealand
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Smiley KO, Phillipps HR, Fang C, Brown RSE, Grattan DR. Mating-induced prolactin surge is not required for subsequent neurogenesis in male mice. Front Behav Neurosci 2023; 17:1227726. [PMID: 37484521 PMCID: PMC10356981 DOI: 10.3389/fnbeh.2023.1227726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 06/16/2023] [Indexed: 07/25/2023] Open
Abstract
Parenting involves major behavioral transitions that are supported by coordinated neuroendocrine and physiological changes to promote the onset of novel offspring-directed behaviors. In comparison to maternal care, however, the mechanisms underlying the transition to paternal care are less understood. Male laboratory mice are predominantly infanticidal as virgins but show paternal responses 2 weeks after mating. Interestingly, males show a mating-induced surge of prolactin, which we hypothesized may be involved in initiating this behavioral transition. During pregnancy, prolactin stimulates olfactory bulb neurogenesis, which is essential for maternal behavior. Mating induces olfactory bulb neurogenesis in males, but it is unknown whether this is driven by prolactin or is important for subsequent paternal care. New olfactory neurons are generated from cells in the subventricular zone (SVZ) and take about 2 weeks to migrate to the olfactory bulb, which may account for the delayed behavioral change in mated males. We investigated whether mating increases cell proliferation at the SVZ. Males were either mated, exposed to receptive female cues, or left alone (control) and injected with Bromodeoxyuridine (BrdU, a marker of cell division). Contrary to our hypothesis, we found that mating decreased cell proliferation in the caudal lateral portion of the SVZ. Next, we tested whether prolactin itself mediates cell proliferation in the SVZ and/or new cell survival in the olfactory bulb by administering bromocriptine (prolactin inhibitor), vehicle, or bromocriptine + prolactin prior to mating. While suppressing prolactin had no effect on cell proliferation in the SVZ, administering exogenous prolactin resulted in significantly higher BrdU-labeled cells in mated but not virgin male mice. No effects of prolactin were observed on new olfactory cell survival. Taken together, prolactin may have context-dependent effects on new cell division in the SVZ, while other unknown mechanisms may be driving the effects on new olfactory cell survival following mating.
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Affiliation(s)
- Kristina O. Smiley
- Department of Anatomy, Centre for Neuroendocrinology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Hollian R. Phillipps
- Department of Anatomy, Centre for Neuroendocrinology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Chenyun Fang
- Department of Anatomy, Centre for Neuroendocrinology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Rosemary S. E. Brown
- Department of Physiology, Centre for Neuroendocrinology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - David R. Grattan
- Department of Anatomy, Centre for Neuroendocrinology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
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Coste A, Fordyce RE, Loch C. A new dolphin with tusk-like teeth from the late Oligocene of New Zealand indicates evolution of novel feeding strategies. Proc Biol Sci 2023; 290:20230873. [PMID: 37312551 PMCID: PMC10265015 DOI: 10.1098/rspb.2023.0873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 05/24/2023] [Indexed: 06/15/2023] Open
Abstract
All extant toothed whales (Cetacea, Odontoceti) are aquatic mammals with homodont dentitions. Fossil evidence from the late Oligocene suggests a greater diversity of tooth forms among odontocetes, including heterodont species with a variety of tooth shapes and orientations. A new fossil dolphin from the late Oligocene of New Zealand, Nihohae matakoi gen. et sp. nov., consisting of a near complete skull, earbones, dentition and some postcranial material, represents this diverse dentition. Several preserved teeth are horizontally procumbent, including all incisors and canines. These tusk-like teeth suggest adaptive advantages for horizontally procumbent teeth in basal dolphins. Phylogenetic analysis places Nihohae among the poorly constrained basal waipatiid group, many with similarly procumbent teeth. Features of N. matakoi such as its dorsoventrally flattened and long rostrum, long mandibular symphysis, unfused cervical vertebrae, lack of attritional or occlusal wear on the teeth and thin enamel cover suggest the rostrum and horizontally procumbent teeth were used to injure and stun prey though swift lateral head movements, a feeding mode that did not persist in extant odontocetes.
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Affiliation(s)
- Ambre Coste
- Department of Geology, University of Otago, Dunedin, New Zealand
| | - R. Ewan Fordyce
- Department of Geology, University of Otago, Dunedin, New Zealand
| | - Carolina Loch
- Faculty of Dentistry, University of Otago, Dunedin, New Zealand
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40
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Hayman DTS, Barraclough RK, Muglia LJ, McGovern V, Afolabi MO, N'Jai AU, Ambe JR, Atim C, McClelland A, Paterson B, Ijaz K, Lasley J, Ahsan Q, Garfield R, Chittenden K, Phelan AL, Lopez Rivera A. Addressing the challenges of implementing evidence-based prioritisation in global health. BMJ Glob Health 2023; 8:e012450. [PMID: 37290897 PMCID: PMC10255200 DOI: 10.1136/bmjgh-2023-012450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 05/14/2023] [Indexed: 06/10/2023] Open
Abstract
Global health requires evidence-based approaches to improve health and decrease inequalities. In a roundtable discussion between health practitioners, funders, academics and policy-makers, we recognised key areas for improvement to deliver better-informed, sustainable and equitable global health practices. These focus on considering information-sharing mechanisms and developing evidence-based frameworks that take an adaptive function-based approach, grounded in the ability to perform and respond to prioritised needs. Increasing social engagement as well as sector and participant diversity in whole-of-society decision-making, and collaborating with and optimising on hyperlocal and global regional entities, will improve prioritisation of global health capabilities. Since the skills required to navigate drivers of pandemics, and the challenges in prioritising, capacity building and response do not sit squarely in the health sector, it is essential to integrate expertise from a broad range of fields to maximise on available knowledge during decision-making and system development. Here, we review the current assessment tools and provide seven discussion points for how improvements to implementation of evidence-based prioritisation can improve global health.
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Affiliation(s)
- David T S Hayman
- Molecular Epidemiology and Public Health Laboratory, Massey University, Palmerston North, New Zealand
| | - Rosemary K Barraclough
- Molecular Epidemiology and Public Health Laboratory, Massey University, Palmerston North, New Zealand
| | - Louis J Muglia
- Burroughs Wellcome Fund, Research Triangle Park, North Carolina, USA
| | - Victoria McGovern
- Burroughs Wellcome Fund, Research Triangle Park, North Carolina, USA
| | - Muhammed O Afolabi
- Department of Disease Control, London School of Hygiene & Tropical Medicine, London, UK
| | - Alhaji U N'Jai
- Department of Microbiology, University of Sierra Leone College of Medicine and Allied Health Sciences, Freetown, Sierra Leone
- Department of Biological Sciences, University of Sierra Leone Fourah Bay College, Freetown, Sierra Leone
| | - Jennyfer R Ambe
- The Global Emerging Pathogens Treatment Consortium, Lagos, Nigeria
| | - Chris Atim
- Results for Development (R4D), Accra, Ghana
| | | | - Beverley Paterson
- Australian National University, Canberra, Australian Capital Territory, Australia
| | - Kashef Ijaz
- Health Programs, The Carter Center, Atlanta, Georgia, USA
| | | | - Qadeer Ahsan
- Australia Indonesia Health Security Partnership, Jakarta, Indonesia
| | | | | | - Alexandra L Phelan
- Center for Health Security, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Abigail Lopez Rivera
- US Department of Health and Human Services, Washington, District of Columbia, USA
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Cornwall CE, Comeau S, Donner SD, Perry C, Dunne J, van Hooidonk R, Ryan JS, Logan CA. Coral adaptive capacity insufficient to halt global transition of coral reefs into net erosion under climate change. Glob Chang Biol 2023; 29:3010-3018. [PMID: 36943744 DOI: 10.1111/gcb.16647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 02/04/2023] [Accepted: 02/07/2023] [Indexed: 05/03/2023]
Abstract
Projecting the effects of climate change on net reef calcium carbonate production is critical to understanding the future impacts on ecosystem function, but prior estimates have not included corals' natural adaptive capacity to such change. Here we estimate how the ability of symbionts to evolve tolerance to heat stress, or for coral hosts to shuffle to favourable symbionts, and their combination, may influence responses to the combined impacts of ocean warming and acidification under three representative concentration pathway (RCP) emissions scenarios (RCP2.6, RCP4.5 and RCP8.5). We show that symbiont evolution and shuffling, both individually and when combined, favours persistent positive net reef calcium carbonate production. However, our projections of future net calcium carbonate production (NCCP) under climate change vary both spatially and by RCP. For example, 19%-35% of modelled coral reefs are still projected to have net positive NCCP by 2050 if symbionts can evolve increased thermal tolerance, depending on the RCP. Without symbiont adaptive capacity, the number of coral reefs with positive NCCP drops to 9%-13% by 2050. Accounting for both symbiont evolution and shuffling, we project median positive NCPP of coral reefs will still occur under low greenhouse emissions (RCP2.6) in the Indian Ocean, and even under moderate emissions (RCP4.5) in the Pacific Ocean. However, adaptive capacity will be insufficient to halt the transition of coral reefs globally into erosion by 2050 under severe emissions scenarios (RCP8.5).
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Affiliation(s)
- Christopher Edward Cornwall
- School of Biological Sciences and Coastal People Southern Skies, Victoria University of Wellington, Wellington, New Zealand
| | - Steeve Comeau
- Laboratoire d'Océanographie de Villefranche, CNRS-INSU, Sorbonne Université, Villefranche-sur-Mer, France
| | - Simon D Donner
- Institute of Resources, Environment and Sustainability / Department of Geography, University of British Columbia, Vancouver, British Columbia, Canada
| | - Chris Perry
- Geography, Faculty of Environment, Science and Economy, University of Exeter, Exeter, UK
| | - John Dunne
- NOAA/OAR Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA
| | - Ruben van Hooidonk
- Cooperative Institute for Marine and Atmospheric Studies, Rosenstiel School of Marine and Atmospheric and Earth Science, University of Miami, Miami, Florida, USA
- Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration, Miami, Florida, USA
| | - James S Ryan
- Department of Marine Science, California State University, Monterey Bay, California, USA
| | - Cheryl A Logan
- Department of Marine Science, California State University, Monterey Bay, California, USA
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42
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Schwartz S, Wilson SJ, Hale TK, Fitzsimons HL. Ankyrin2 is essential for neuronal morphogenesis and long-term courtship memory in Drosophila. Mol Brain 2023; 16:42. [PMID: 37194019 DOI: 10.1186/s13041-023-01026-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 04/13/2023] [Indexed: 05/18/2023] Open
Abstract
Dysregulation of HDAC4 expression and/or nucleocytoplasmic shuttling results in impaired neuronal morphogenesis and long-term memory in Drosophila melanogaster. A recent genetic screen for genes that interact in the same molecular pathway as HDAC4 identified the cytoskeletal adapter Ankyrin2 (Ank2). Here we sought to investigate the role of Ank2 in neuronal morphogenesis, learning and memory. We found that Ank2 is expressed widely throughout the Drosophila brain where it localizes predominantly to axon tracts. Pan-neuronal knockdown of Ank2 in the mushroom body, a region critical for memory formation, resulted in defects in axon morphogenesis. Similarly, reduction of Ank2 in lobular plate tangential neurons of the optic lobe disrupted dendritic branching and arborization. Conditional knockdown of Ank2 in the mushroom body of adult Drosophila significantly impaired long-term memory (LTM) of courtship suppression, and its expression was essential in the γ neurons of the mushroom body for normal LTM. In summary, we provide the first characterization of the expression pattern of Ank2 in the adult Drosophila brain and demonstrate that Ank2 is critical for morphogenesis of the mushroom body and for the molecular processes required in the adult brain for the formation of long-term memories.
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Affiliation(s)
- Silvia Schwartz
- School of Natural Sciences, Massey University, Palmerston North, New Zealand
- Current Address: Istituto Italiano di Tecnologia, Center for Life NanoScience, Rome, Italy
| | - Sarah J Wilson
- School of Natural Sciences, Massey University, Palmerston North, New Zealand
| | - Tracy K Hale
- School of Natural Sciences, Massey University, Palmerston North, New Zealand
| | - Helen L Fitzsimons
- School of Natural Sciences, Massey University, Palmerston North, New Zealand.
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43
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Devaux JBL, Hedges CP, Birch N, Herbert N, Renshaw GMC, Hickey AJR. Electron transfer and ROS production in brain mitochondria of intertidal and subtidal triplefin fish (Tripterygiidae). J Comp Physiol B 2023:10.1007/s00360-023-01495-4. [PMID: 37145369 DOI: 10.1007/s00360-023-01495-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/01/2023] [Accepted: 04/27/2023] [Indexed: 05/06/2023]
Abstract
While oxygen is essential for oxidative phosphorylation, O2 can form reactive species (ROS) when interacting with electrons of mitochondrial electron transport system. ROS is dependent on O2 pressure (PO2) and has traditionally been assessed in O2 saturated media, PO2 at which mitochondria do not typically function in vivo. Mitochondrial ROS can be significantly elevated by the respiratory complex II substrate succinate, which can accumulate within hypoxic tissues, and this is exacerbated further with reoxygenation. Intertidal species are repetitively exposed to extreme O2 fluctuations, and have likely evolved strategies to avoid excess ROS production. We evaluated mitochondrial electron leakage and ROS production in permeabilized brain of intertidal and subtidal triplefin fish species from hyperoxia to anoxia, and assessed the effect of anoxia reoxygenation and the influence of increasing succinate concentrations. At typical intracellular PO2, net ROS production was similar among all species; however at elevated PO2, brain tissues of the intertidal triplefin fish released less ROS than subtidal species. In addition, following in vitro anoxia reoxygenation, electron transfer mediated by succinate titration was better directed to respiration, and not to ROS production for intertidal species. Overall, these data indicate that intertidal triplefin fish species better manage electrons within the ETS, from hypoxic-hyperoxic transitions.
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Affiliation(s)
- Jules B L Devaux
- School of Biological Sciences, The University of Auckland, Auckland Mail Centre, Private Bag 92019, Auckland, 1142, New Zealand.
| | - Chris P Hedges
- School of Biological Sciences, The University of Auckland, Auckland Mail Centre, Private Bag 92019, Auckland, 1142, New Zealand
| | - Nigel Birch
- School of Biological Sciences, The University of Auckland, Auckland Mail Centre, Private Bag 92019, Auckland, 1142, New Zealand
| | - Neill Herbert
- Institute of Marine Science, The University Auckland, Auckland, 1142, New Zealand
| | - Gillian M C Renshaw
- School of Allied Health Sciences, Griffith University, Gold Coast Campus, Gold Coast, QLD, 4222, Australia
| | - Anthony J R Hickey
- School of Biological Sciences, The University of Auckland, Auckland Mail Centre, Private Bag 92019, Auckland, 1142, New Zealand
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Arras SD, Sibaeva N, Catchpole RJ, Horinouchi N, Si D, Rickerby AM, Deguchi K, Hibi M, Tanaka K, Takeuchi M, Ogawa J, Poole AM. Characterisation of an Escherichia coli line that completely lacks ribonucleotide reduction yields insights into the evolution of parasitism and endosymbiosis. eLife 2023; 12:83845. [PMID: 37022136 PMCID: PMC10121223 DOI: 10.7554/elife.83845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 04/05/2023] [Indexed: 04/07/2023] Open
Abstract
All life requires ribonucleotide reduction for de novo synthesis of deoxyribonucleotides. A handful of obligate intracellular species are known to lack ribonucleotide reduction and are instead dependent on their host for deoxyribonucleotide synthesis. As ribonucleotide reduction has on occasion been lost in obligate intracellular parasites and endosymbionts, we reasoned that it should in principle be possible to knock this process out entirely under conditions where deoxyribonucleosides are present in the growth media. We report here the creation of a strain of E. coli where all three ribonucleotide reductase operons have been fully deleted following introduction of a broad spectrum deoxyribonucleoside kinase from Mycoplasma mycoides. Our strain is able to grow in the presence of deoxyribonucleosides and shows slowed but substantial growth. Under limiting deoxyribonucleoside levels, we observe a distinctive filamentous cell morphology, where cells grow but do not appear to divide regularly. Finally, we examined whether our lines are able to adapt to limited supplies of deoxyribonucleosides, as might occur in the evolutionary switch from de novo synthesis to dependence on host production during the evolution of parasitism or endosymbiosis. Over the course of an evolution experiment, we observe a 25-fold reduction in the minimum concentration of exogenous deoxyribonucleosides necessary for growth. Genome analysis of replicate lines reveals that several lines carry mutations in deoB and cdd. deoB codes for phosphopentomutase, a key part of the deoxyriboaldolase pathway, which has been hypothesised as an alternative to ribonucleotide reduction for deoxyribonucleotide synthesis. Rather than synthesis via this pathway complementing the loss of ribonucleotide reduction, our experiments reveal that mutations appear that reduce or eliminate the capacity for this pathway to catabolise deoxyribonucleotides, thus preventing their loss via central metabolism. Mutational inactivation of both deoB and cdd is also observed in a number of obligate intracellular bacteria that have lost ribonucleotide reduction. We conclude that our experiments recapitulate key evolutionary steps in the adaptation to intracellular life without ribonucleotide reduction.
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Affiliation(s)
- Samantha D Arras
- School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Nellie Sibaeva
- School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Ryan J Catchpole
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | | | - Dayong Si
- Division of Applied Life Sciences, Kyoto University, Kyoto, Japan
| | - Alannah M Rickerby
- School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Kengo Deguchi
- Division of Applied Life Sciences, Kyoto University, Kyoto, Japan
| | - Makoto Hibi
- Division of Applied Life Sciences, Kyoto University, Kyoto, Japan
| | - Koichi Tanaka
- Division of Applied Life Sciences, Kyoto University, Kyoto, Japan
| | - Michiki Takeuchi
- Division of Applied Life Sciences, Kyoto University, Kyoto, Japan
| | - Jun Ogawa
- Division of Applied Life Sciences, Kyoto University, Kyoto, Japan
| | - Anthony M Poole
- School of Biological Sciences, University of Auckland, Auckland, New Zealand
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Felippe ISA, Zera T, da Silva MP, Moraes DJA, McBryde F, Paton JFR. The sympathetic nervous system exacerbates carotid body sensitivity in hypertension. Cardiovasc Res 2023; 119:316-331. [PMID: 35048948 PMCID: PMC10022867 DOI: 10.1093/cvr/cvac008] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 11/24/2021] [Accepted: 01/14/2022] [Indexed: 11/14/2022] Open
Abstract
AIMS The carotid bodies (CBs) of spontaneously hypertensive (SH) rats exhibit hypertonicity and hyperreflexia contributing to heightened peripheral sympathetic outflow. We hypothesized that CB hyperexcitability is driven by its own sympathetic innervation. METHODS AND RESULTS To test this, the chemoreflex was activated (NaCN 50-100 µL, 0.4 µg/µL) in SH and Wistar rats in situ before and after: (i) electrical stimulation (ES; 30 Hz, 2 ms, 10 V) of the superior cervical ganglion (SCG), which innervates the CB; (ii) unilateral resection of the SCG (SCGx); (iii) CB injections of an α1-adrenergic receptor agonist (phenylephrine, 50 µL, 1 mmol/L), and (iv) α1-adrenergic receptor antagonist prazosin (40 µL, 1 mmol/L) or tamsulosin (50 µL, 1 mmol/L). ES of the SCG enhanced CB-evoked sympathoexcitation by 40-50% (P < 0.05) with no difference between rat strains. Unilateral SCGx attenuated the CB-evoked sympathoexcitation in SH (62%; P < 0.01) but was without effect in Wistar rats; it also abolished the ongoing firing of chemoreceptive petrosal neurones of SH rats, which became hyperpolarized. In Wistar rats, CB injections of phenylephrine enhanced CB-evoked sympathoexcitation (33%; P < 0.05), which was prevented by prazosin (26%; P < 0.05) in SH rats. Tamsulosin alone reproduced the effects of prazosin in SH rats and prevented the sensitizing effect of the SCG following ES. Within the CB, α1A- and α1B-adrenoreceptors were co-localized on both glomus cells and blood vessels. In conscious SH rats instrumented for recording blood pressure (BP), the CB-evoked pressor response was attenuated after SCGx, and systolic BP fell by 16 ± 4.85 mmHg. CONCLUSIONS The sympathetic innervation of the CB is tonically activated and sensitizes the CB of SH but not Wistar rats. Furthermore, sensitization of CB-evoked reflex sympathoexcitation appears to be mediated by α1-adrenoceptors located either on the vasculature and/or glomus cells. The SCG is novel target for controlling CB pathophysiology in hypertension.
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Affiliation(s)
- Igor S A Felippe
- Department of Physiology, Faculty of Health & Medical Sciences, Manaaki Mānawa—The Centre for Heart Research, University of Auckland, 85 Park Road, Grafton Campus, Auckland 1023, New Zealand
| | - Tymoteusz Zera
- Department of Experimental and Clinical Physiology, Laboratory of Centre for Preclinical Research, Medical University of Warsaw, Warsaw 02-091, Poland
| | - Melina P da Silva
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP 14040-900, Brazil
| | - Davi J A Moraes
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP 14040-900, Brazil
| | - Fiona McBryde
- Department of Physiology, Faculty of Health & Medical Sciences, Manaaki Mānawa—The Centre for Heart Research, University of Auckland, 85 Park Road, Grafton Campus, Auckland 1023, New Zealand
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Athavale ON, Avci R, Cheng LK, Du P. Computational models of autonomic regulation in gastric motility: Progress, challenges, and future directions. Front Neurosci 2023; 17:1146097. [PMID: 37008202 PMCID: PMC10050371 DOI: 10.3389/fnins.2023.1146097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 02/27/2023] [Indexed: 03/17/2023] Open
Abstract
The stomach is extensively innervated by the vagus nerve and the enteric nervous system. The mechanisms through which this innervation affects gastric motility are being unraveled, motivating the first concerted steps towards the incorporation autonomic regulation into computational models of gastric motility. Computational modeling has been valuable in advancing clinical treatment of other organs, such as the heart. However, to date, computational models of gastric motility have made simplifying assumptions about the link between gastric electrophysiology and motility. Advances in experimental neuroscience mean that these assumptions can be reviewed, and detailed models of autonomic regulation can be incorporated into computational models. This review covers these advances, as well as a vision for the utility of computational models of gastric motility. Diseases of the nervous system, such as Parkinson’s disease, can originate from the brain-gut axis and result in pathological gastric motility. Computational models are a valuable tool for understanding the mechanisms of disease and how treatment may affect gastric motility. This review also covers recent advances in experimental neuroscience that are fundamental to the development of physiology-driven computational models. A vision for the future of computational modeling of gastric motility is proposed and modeling approaches employed for existing mathematical models of autonomic regulation of other gastrointestinal organs and other organ systems are discussed.
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Blank ML, Hoek J. Navigating social interactions and constructing vaping social identities: A qualitative exploration with New Zealand young adults who smoke. Drug Alcohol Rev 2023; 42:268-276. [PMID: 36065162 PMCID: PMC10087447 DOI: 10.1111/dar.13542] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 08/07/2022] [Accepted: 08/16/2022] [Indexed: 02/03/2023]
Abstract
INTRODUCTION Social interactions help smoking and vaping practices evolve, and are essential when constructing social identities. Among people who smoke, vaping offers an alternative practice to 'smoking' and 'non-smoking', and using e-cigarettes blurs the boundaries between 'smoker' and 'non-smoker' social identities. In this study, we explored the development of vaping and smoking social identities over time among young adults who smoked and used e-cigarettes. METHODS Over 18-24 weeks during 2018-2019, we conducted five interviews with each of 11 New Zealand young adults aged 19-29 years who tried vaping to stop smoking. We analysed participants' interview transcripts for social interactions involving smoking or vaping and used social identity theory to explore their construction of vaping social identities. RESULTS Participants entered the study with smoke-free goals, and constructed social identities explicitly in relation to a smoke-free transition. Two key identity processes, 'adopting legitimacy' and 'transferring considerateness', informed participants' social identity construction as they attempted to reconcile their e-cigarette use with their pre-study characterisations of vaping as 'illegitimate' and 'obnoxious'. Our findings suggest that adopting a 'legitimate' vaper identity focussed on smoking cessation, and being perceived and accepted by others as a 'legitimate vaper', were essential in participants' identification as 'vapers'. Identifying as a 'legitimate' vaper was a pre-requisite to transferring a 'considerate' identity from smoking to vaping. DISCUSSION AND CONCLUSION Participants' construction of vaping social identities suggests that negotiating and reconciling valued aspects of a smoking social identity with nascent vaping practices may be important during smoking-to-vaping transition attempts.
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Affiliation(s)
- Mei-Ling Blank
- Department of Preventive and Social Medicine, University of Otago, Dunedin, New Zealand
| | - Janet Hoek
- Department of Public Health, University of Otago, Wellington, New Zealand
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Ko J, Sequeira IR, Skudder-Hill L, Cho J, Poppitt SD, Petrov MS. Metabolic traits affecting the relationship between liver fat and intrapancreatic fat: a mediation analysis. Diabetologia 2023; 66:190-200. [PMID: 36194248 PMCID: PMC9729324 DOI: 10.1007/s00125-022-05793-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 08/08/2022] [Indexed: 12/14/2022]
Abstract
AIMS/HYPOTHESIS The clinical importance of fat deposition in the liver and pancreas is increasingly recognised. However, to what extent deposition of fat in these two depots is affected by intermediate variables is unknown. The aim of this work was to conduct a mediation analysis with a view to uncovering the metabolic traits that underlie the relationship between liver fat and intrapancreatic fat deposition (IPFD) and quantifying their effect. METHODS All participants underwent MRI/magnetic resonance spectroscopy on the same 3.0 T scanner to determine liver fat and IPFD. IPFD of all participants was quantified manually by two independent raters in duplicate. A total of 16 metabolic traits (representing markers of glucose metabolism, incretins, lipid panel, liver enzymes, pancreatic hormones and their derivatives) were measured in blood. Mediation analysis was conducted, taking into account age, sex, ethnicity and BMI. Significance of mediation was tested by computing bias-corrected bootstrap CIs with 5000 repetitions. RESULTS A total of 353 individuals were studied. Plasma glucose, HDL-cholesterol and triacylglycerol mediated 6.8%, 17.9% and 24.3%, respectively, of the association between liver fat and IPFD. Total cholesterol, LDL-cholesterol, alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, γ-glutamyl transpeptidase, insulin, glucagon, amylin, C-peptide, HbA1c, glucagon-like peptide-1 and gastric inhibitory peptide did not mediate the association between liver fat and IPFD. CONCLUSIONS/INTERPRETATION At least one-quarter of the association between liver fat and IPFD is mediated by specific blood biomarkers (triacylglycerol, HDL-cholesterol and glucose), after accounting for potential confounding by age, sex, ethnicity and BMI. This unveils the complexity of the association between the two fat depots and presents specific targets for intervention.
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Affiliation(s)
- Juyeon Ko
- School of Medicine, University of Auckland, Auckland, New Zealand
| | - Ivana R Sequeira
- Human Nutrition Unit, School of Biological Sciences, University of Auckland, Auckland, New Zealand
- High Value Nutrition, National Science Challenge, Auckland, New Zealand
| | | | - Jaelim Cho
- School of Medicine, University of Auckland, Auckland, New Zealand
| | - Sally D Poppitt
- School of Medicine, University of Auckland, Auckland, New Zealand
- Human Nutrition Unit, School of Biological Sciences, University of Auckland, Auckland, New Zealand
- High Value Nutrition, National Science Challenge, Auckland, New Zealand
- Riddet Centre of Research Excellence for Food and Nutrition, Palmerston North, New Zealand
| | - Maxim S Petrov
- School of Medicine, University of Auckland, Auckland, New Zealand.
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Chong GLW, Böhmert B, Lee LEJ, Bols NC, Dowd GC. A continuous myofibroblast precursor cell line from the tail muscle of Australasian snapper (Chrysophrys auratus) that responds to transforming growth factor beta and fibroblast growth factor. In Vitro Cell Dev Biol Anim 2022; 58:922-935. [PMID: 36378268 PMCID: PMC9780137 DOI: 10.1007/s11626-022-00734-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 10/27/2022] [Indexed: 11/16/2022]
Abstract
Chrysophrys auratus (Australasian snapper) is one of the largest and most valuable finfish from capture fisheries in New Zealand, yet no cell lines from this species are reported in the scientific literature. Here, we describe a muscle-derived cell line initiated from the tail of a juvenile snapper which has been designated CAtmus1PFR (Chrysophrys auratus, tail muscle, Plant & Food Research). The cell line has been passaged over 100 times in 3 years and is considered immortal. Cells are reliant on serum supplementation for proliferation and exhibit a broad thermal profile comparable to the eurythermic nature of C. auratus in vivo. The impact of exogenous growth factors, including insulin-like growth factors I and II (IGF-I and IGF-II), basic fibroblast growth factor (bFGF), and transforming growth factor beta (TGFβ), on cell morphology and proliferation was investigated. Insulin-like growth factors acted as mitogens and had minimal effect on cell morphology. TGFβ exposure resulted in CAtmus1PFR exhibiting a myofibroblast morphology becoming enlarged with actin bundling. This differentiation was confirmed through the expression of smooth muscle actin (sma), an increase in type 1 collagen (col1a) expression, and a loss of motility. Expression of col1a and sma was decreased when cells were exposed to bFGF, and no actin bundling was observed. These data indicate that CAtmus1PFR may be myofibroblastic precursor cells descending from mesenchymal progenitor cells present in the tail muscle myosepta.
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Affiliation(s)
- Gavril L. W. Chong
- The New Zealand Institute for Plant and Food Research Ltd, Nelson Research Centre, 293 Akersten Street, Nelson, 7010 New Zealand
| | - Björn Böhmert
- The New Zealand Institute for Plant and Food Research Ltd, Nelson Research Centre, 293 Akersten Street, Nelson, 7010 New Zealand
| | - Lucy E. J. Lee
- Faculty of Science, University of the Fraser Valley, Abbotsford, BC V2S 7M8 Canada
| | - Niels C. Bols
- Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1 Canada
| | - Georgina C. Dowd
- The New Zealand Institute for Plant and Food Research Ltd, Nelson Research Centre, 293 Akersten Street, Nelson, 7010 New Zealand
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Shepherd LD, Miskelly CM, Bulgarella M, Tennyson AJD. Genomic analyses of fairy and fulmar prions (Procellariidae: Pachyptila spp.) reveals parallel evolution of bill morphology, and multiple species. PLoS One 2022; 17:e0275102. [PMID: 36166411 PMCID: PMC9514608 DOI: 10.1371/journal.pone.0275102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 09/11/2022] [Indexed: 11/18/2022] Open
Abstract
Prions are small petrels that are abundant around the Southern Ocean. Here we use mitochondrial DNA (COI and cytochrome b) and nuclear reduced representation sequencing (ddRADseq) to examine the relationships within and between fairy (Pachyptila turtur) and fulmar (P. crassirostris) prions from across their distributions. We found that neither species was recovered as monophyletic, and that at least three species were represented. Furthermore, we detected several genetic lineages that are also morphologically distinct occurring in near sympatry at two locations (Snares Islands and Chatham Islands). The factors that have driven diversification in the fairy/fulmar prion complex are unclear but may include philopatry, differences in foraging distribution during breeding, differences in non-breeding distributions and breeding habitat characteristics. The observed distribution of genetic variation in the fairy/fulmar prion complex is consistent with population expansion from ice-free Last Glacial Maximum refugia into previously glaciated areas.
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Affiliation(s)
- Lara D. Shepherd
- Museum of New Zealand Te Papa Tongarewa, Wellington, New Zealand
- * E-mail:
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