1
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Jacquelot N, Xiong L, Cao WHJ, Huang Q, Yu H, Sayad A, Anttila CJA, Baldwin TM, Hickey PF, Amann-Zalcenstein D, Ohashi PS, Nutt SL, Belz GT, Seillet C. PD-1 regulates ILC3-driven intestinal immunity and homeostasis. Mucosal Immunol 2024:S1933-0219(24)00021-7. [PMID: 38492744 DOI: 10.1016/j.mucimm.2024.03.002] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 02/13/2024] [Accepted: 03/08/2024] [Indexed: 03/18/2024]
Abstract
Interleukin-(IL) 22 production by intestinal group 3 innate lymphoid cells (ILC3) is critical to maintain gut homeostasis. However, IL-22 needs to be tightly controlled; reduced IL-22 expression is associated with intestinal epithelial barrier defect while its overexpression promotes tumor development. Here, using a single cell RNAseq approach, we identified a core set of genes associated with increased IL-22 production by ILC3. Among these genes, Programmed cell death 1 (PD-1), extensively studied in the context of cancer and chronic infection, was constitutively expressed on a subset of ILC3. These cells, found in the crypt of the small intestine and colon, displayed superior capacity to produce IL-22. PD-1 expression on ILC3 was dependent on the microbiota and was induced during inflammation in response to IL-23 but, conversely, was reduced in the presence of Notch ligand. PD-1+ ILC3 exhibited distinct metabolic activity with increased glycolytic, lipid and polyamine synthesis associated with augmented proliferation compared with their PD-1- counterparts. Further, PD-1+ ILC3 showed increased expression of mitochondrial antioxidant proteins which enable the cells to maintain their levels of reactive oxygen species (ROS). Loss of PD-1 signaling in ILC3 led to reduced IL-22 production in a cell intrinsic manner. During inflammation, PD-1 expression was increased on NCR- ILC3 while deficiency in PD-1 expression resulted in increased susceptibility to experimental colitis and failure to maintain gut barrier integrity. Collectively, our findings uncover a new function of the PD-1 and highlight the role of PD-1 signaling in the maintenance of gut homeostasis mediated by ILC3 in mice.
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Affiliation(s)
- Nicolas Jacquelot
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1, Canada; Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB T2N 4N1; Arnie Charbonneau Cancer Research Institute, Calgary, AB T2N 4N1, Canada.
| | - Le Xiong
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia; Department of Medical Biology, University of Melbourne, Parkville, 3010, Australia
| | - Wang H J Cao
- Frazer Institute, The University of Queensland, Woolloongabba, Queensland, 4102, Australia
| | - Qiutong Huang
- Frazer Institute, The University of Queensland, Woolloongabba, Queensland, 4102, Australia
| | - Huiyang Yu
- Frazer Institute, The University of Queensland, Woolloongabba, Queensland, 4102, Australia
| | - Azin Sayad
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, M5G 2C1, Canada
| | - Casey J A Anttila
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia
| | - Tracey M Baldwin
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia
| | - Peter F Hickey
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia; Department of Medical Biology, University of Melbourne, Parkville, 3010, Australia
| | - Daniela Amann-Zalcenstein
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia; Department of Medical Biology, University of Melbourne, Parkville, 3010, Australia
| | - Pamela S Ohashi
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, M5G 2C1, Canada; Department of Immunology, University of Toronto, Faculty of Medicine, Toronto, Ontario, M5G 2M9, Canada
| | - Stephen L Nutt
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia; Department of Medical Biology, University of Melbourne, Parkville, 3010, Australia
| | - Gabrielle T Belz
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia; Department of Medical Biology, University of Melbourne, Parkville, 3010, Australia; Frazer Institute, The University of Queensland, Woolloongabba, Queensland, 4102, Australia.
| | - Cyril Seillet
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia; Department of Medical Biology, University of Melbourne, Parkville, 3010, Australia.
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2
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Brown DV, Anttila CJA, Ling L, Grave P, Baldwin TM, Munnings R, Farchione AJ, Bryant VL, Dunstone A, Biben C, Taoudi S, Weber TS, Naik SH, Hadla A, Barker HE, Vandenberg CJ, Dall G, Scott CL, Moore Z, Whittle JR, Freytag S, Best SA, Papenfuss AT, Olechnowicz SWZ, MacRaild SE, Wilcox S, Hickey PF, Amann-Zalcenstein D, Bowden R. A risk-reward examination of sample multiplexing reagents for single cell RNA-Seq. Genomics 2024; 116:110793. [PMID: 38220132 DOI: 10.1016/j.ygeno.2024.110793] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 11/29/2023] [Accepted: 01/09/2024] [Indexed: 01/16/2024]
Abstract
Single-cell RNA sequencing (scRNA-Seq) has emerged as a powerful tool for understanding cellular heterogeneity and function. However the choice of sample multiplexing reagents can impact data quality and experimental outcomes. In this study, we compared various multiplexing reagents, including MULTI-Seq, Hashtag antibody, and CellPlex, across diverse sample types such as human peripheral blood mononuclear cells (PBMCs), mouse embryonic brain and patient-derived xenografts (PDXs). We found that all multiplexing reagents worked well in cell types robust to ex vivo manipulation but suffered from signal-to-noise issues in more delicate sample types. We compared multiple demultiplexing algorithms which differed in performance depending on data quality. We find that minor improvements to laboratory workflows such as titration and rapid processing are critical to optimal performance. We also compared the performance of fixed scRNA-Seq kits and highlight the advantages of the Parse Biosciences kit for fragile samples. Highly multiplexed scRNA-Seq experiments require more sequencing resources, therefore we evaluated CRISPR-based destruction of non-informative genes to enhance sequencing value. Our comprehensive analysis provides insights into the selection of appropriate sample multiplexing reagents and protocols for scRNA-Seq experiments, facilitating more accurate and cost-effective studies.
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Affiliation(s)
- Daniel V Brown
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia.
| | - Casey J A Anttila
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia
| | - Ling Ling
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia
| | - Patrick Grave
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia
| | - Tracey M Baldwin
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia
| | - Ryan Munnings
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Anthony J Farchione
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Vanessa L Bryant
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia; The Royal Melbourne Hospital, 300 Grattan St, Parkville, Melbourne 3010, VIC, Australia
| | - Amelia Dunstone
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia
| | - Christine Biben
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Samir Taoudi
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Tom S Weber
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Shalin H Naik
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Anthony Hadla
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Holly E Barker
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Cassandra J Vandenberg
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Genevieve Dall
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Clare L Scott
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Zachery Moore
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - James R Whittle
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia; Peter MacCallum Cancer Centre, 305 Grattan St, Parkville, Melbourne 3010, VIC, Australia
| | - Saskia Freytag
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Sarah A Best
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Anthony T Papenfuss
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia; Peter MacCallum Cancer Centre, 305 Grattan St, Parkville, Melbourne 3010, VIC, Australia
| | - Sam W Z Olechnowicz
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Sarah E MacRaild
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia
| | - Stephen Wilcox
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia
| | - Peter F Hickey
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Daniela Amann-Zalcenstein
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia
| | - Rory Bowden
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade VIC, Melbourne 3052, VIC, Australia; Department of Medical Biology, University of Melbourne, Parkville, Melbourne 3010, VIC, Australia.
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3
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Perriman L, Tavakolinia N, Jalali S, Li S, Hickey PF, Amann-Zalcenstein D, Ho WWH, Baldwin TM, Piers AT, Konstantinov IE, Anderson J, Stanley EG, Licciardi PV, Kannourakis G, Naik SH, Koay HF, Mackay LK, Berzins SP, Pellicci DG. A three-stage developmental pathway for human Vγ9Vδ2 T cells within the postnatal thymus. Sci Immunol 2023; 8:eabo4365. [PMID: 37450574 DOI: 10.1126/sciimmunol.abo4365] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 06/14/2023] [Indexed: 07/18/2023]
Abstract
Vγ9Vδ2 T cells are the largest population of γδ T cells in adults and can play important roles in providing effective immunity against cancer and infection. Many studies have suggested that peripheral Vγ9Vδ2 T cells are derived from the fetal liver and thymus and that the postnatal thymus plays little role in the development of these cells. More recent evidence suggested that these cells may also develop postnatally in the thymus. Here, we used high-dimensional flow cytometry, transcriptomic analysis, functional assays, and precursor-product experiments to define the development pathway of Vγ9Vδ2 T cells in the postnatal thymus. We identify three distinct stages of development for Vγ9Vδ2 T cells in the postnatal thymus that are defined by the progressive acquisition of functional potential and major changes in the expression of transcription factors, chemokines, and other surface markers. Furthermore, our analysis of donor-matched thymus and blood revealed that the molecular requirements for the development of functional Vγ9Vδ2 T cells are delivered predominantly by the postnatal thymus and not in the periphery. Tbet and Eomes, which are required for IFN-γ and TNFα expression, are up-regulated as Vγ9Vδ2 T cells mature in the thymus, and mature thymic Vγ9Vδ2 T cells rapidly express high levels of these cytokines after stimulation. Similarly, the postnatal thymus programs Vγ9Vδ2 T cells to express the cytolytic molecules, perforin, granzyme A, and granzyme K. This study provides a greater understanding of how Vγ9Vδ2 T cells develop in humans and may lead to opportunities to manipulate these cells to treat human diseases.
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Affiliation(s)
- Louis Perriman
- Murdoch Children's Research Institute, Melbourne, Australia
- Department of Paediatrics, University of Melbourne, Melbourne, Australia
- Fiona Elsey Cancer Research Institute, Ballarat, Australia
- Federation University Australia, Ballarat, Australia
| | - Naeimeh Tavakolinia
- Murdoch Children's Research Institute, Melbourne, Australia
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Sedigheh Jalali
- Murdoch Children's Research Institute, Melbourne, Australia
- Department of Paediatrics, University of Melbourne, Melbourne, Australia
| | - Shuo Li
- Murdoch Children's Research Institute, Melbourne, Australia
| | - Peter F Hickey
- Advanced Genomics Facility and Single Cell Open Research Endeavour (SCORE), Advanced Technology and Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
- Department of Medical Biology, University of Melbourne, Parkville, Victoria, Australia
| | - Daniela Amann-Zalcenstein
- Advanced Genomics Facility and Single Cell Open Research Endeavour (SCORE), Advanced Technology and Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
- Department of Medical Biology, University of Melbourne, Parkville, Victoria, Australia
| | - William Wing Ho Ho
- Advanced Genomics Facility and Single Cell Open Research Endeavour (SCORE), Advanced Technology and Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
| | - Tracey M Baldwin
- Advanced Genomics Facility and Single Cell Open Research Endeavour (SCORE), Advanced Technology and Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
| | - Adam T Piers
- Murdoch Children's Research Institute, Melbourne, Australia
- Melbourne Centre for Cardiovascular Genomics and Regenerative Medicine, Melbourne, Australia
| | - Igor E Konstantinov
- Murdoch Children's Research Institute, Melbourne, Australia
- Department of Paediatrics, University of Melbourne, Melbourne, Australia
- Melbourne Centre for Cardiovascular Genomics and Regenerative Medicine, Melbourne, Australia
- Cardiothoracic Surgery, Royal Children's Hospital, Melbourne, Australia
| | - Jeremy Anderson
- Murdoch Children's Research Institute, Melbourne, Australia
- Department of Paediatrics, University of Melbourne, Melbourne, Australia
| | - Edouard G Stanley
- Murdoch Children's Research Institute, Melbourne, Australia
- Department of Paediatrics, University of Melbourne, Melbourne, Australia
| | - Paul V Licciardi
- Murdoch Children's Research Institute, Melbourne, Australia
- Department of Paediatrics, University of Melbourne, Melbourne, Australia
| | - George Kannourakis
- Fiona Elsey Cancer Research Institute, Ballarat, Australia
- Federation University Australia, Ballarat, Australia
| | - Shalin H Naik
- Department of Medical Biology, University of Melbourne, Parkville, Victoria, Australia
- Immunology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
| | - Hui-Fern Koay
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Laura K Mackay
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Stuart P Berzins
- Fiona Elsey Cancer Research Institute, Ballarat, Australia
- Federation University Australia, Ballarat, Australia
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Daniel G Pellicci
- Murdoch Children's Research Institute, Melbourne, Australia
- Department of Paediatrics, University of Melbourne, Melbourne, Australia
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
- Melbourne Centre for Cardiovascular Genomics and Regenerative Medicine, Melbourne, Australia
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4
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You Y, Dong X, Wee YK, Maxwell MJ, Alhamdoosh M, Smyth GK, Hickey PF, Ritchie ME, Law CW. Publisher Correction: Modeling group heteroscedasticity in single-cell RNA-seq pseudo-bulk data. Genome Biol 2023; 24:112. [PMID: 37173797 PMCID: PMC10176689 DOI: 10.1186/s13059-023-02965-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2023] Open
Affiliation(s)
- Yue You
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia.
- Department of Medical Biology, The University of Melbourne, Parkville, Australia.
| | - Xueyi Dong
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
| | | | | | | | - Gordon K Smyth
- Bioinformatics Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- School of Mathematics and Statistics, The University of Melbourne, Parkville, Australia
| | - Peter F Hickey
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
- Advanced Technology and Biology Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
| | - Matthew E Ritchie
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia.
- Department of Medical Biology, The University of Melbourne, Parkville, Australia.
| | - Charity W Law
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia.
- Department of Medical Biology, The University of Melbourne, Parkville, Australia.
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5
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You Y, Dong X, Wee YK, Maxwell MJ, Alhamdoosh M, Smyth GK, Hickey PF, Ritchie ME, Law CW. Modeling group heteroscedasticity in single-cell RNA-seq pseudo-bulk data. Genome Biol 2023; 24:107. [PMID: 37147723 PMCID: PMC10160736 DOI: 10.1186/s13059-023-02949-2] [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: 09/12/2022] [Accepted: 04/21/2023] [Indexed: 05/07/2023] Open
Abstract
Group heteroscedasticity is commonly observed in pseudo-bulk single-cell RNA-seq datasets and its presence can hamper the detection of differentially expressed genes. Since most bulk RNA-seq methods assume equal group variances, we introduce two new approaches that account for heteroscedastic groups, namely voomByGroup and voomWithQualityWeights using a blocked design (voomQWB). Compared to current gold-standard methods that do not account for group heteroscedasticity, we show results from simulations and various experiments that demonstrate the superior performance of voomByGroup and voomQWB in terms of error control and power when group variances in pseudo-bulk single-cell RNA-seq data are unequal.
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Affiliation(s)
- Yue You
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia.
- Department of Medical Biology, The University of Melbourne, Parkville, Australia.
| | | | | | | | | | - Gordon K Smyth
- Bioinformatics Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- School of Mathematics and Statistics, The University of Melbourne, Parkville, Australia
| | - Peter F Hickey
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
- Advanced Technology and Biology Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
| | - Matthew E Ritchie
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
| | - Charity W Law
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
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6
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Keniry A, Jansz N, Hickey PF, Breslin KA, Iminitoff M, Beck T, Gouil Q, Ritchie ME, Blewitt ME. A method for stabilising the XX karyotype in female mESC cultures. Development 2022; 149:285125. [PMID: 36355065 PMCID: PMC10112917 DOI: 10.1242/dev.200845] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 10/30/2022] [Indexed: 11/12/2022]
Abstract
Female mouse embryonic stem cells (mESCs) present differently from male mESCs in several fundamental ways; however, complications with their in vitro culture have resulted in an under-representation of female mESCs in the literature. Recent studies show that the second X chromosome in female, and more specifically the transcriptional activity from both of these chromosomes due to absent X chromosome inactivation, sets female and male mESCs apart. To avoid this undesirable state, female mESCs in culture preferentially adopt an XO karyotype, with this adaption leading to loss of their unique properties in favour of a state that is near indistinguishable from male mESCs. If female pluripotency is to be studied effectively in this system, it is crucial that high-quality cultures of XX mESCs are available. Here, we report a method for better maintaining XX female mESCs in culture that also stabilises the male karyotype and makes study of female-specific pluripotency more feasible.
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Affiliation(s)
- Andrew Keniry
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia.,The Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Natasha Jansz
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia.,The Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Peter F Hickey
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia.,The Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Kelsey A Breslin
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia
| | - Megan Iminitoff
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia.,The Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Tamara Beck
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia
| | - Quentin Gouil
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia.,The Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Matthew E Ritchie
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia.,The Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Marnie E Blewitt
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC 3052, Australia.,The Department of Medical Biology, University of Melbourne, Parkville, VIC 3010, Australia
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7
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Grant ZL, Hickey PF, Abeysekera W, Whitehead L, Lewis SM, Symons RCA, Baldwin TM, Amann-Zalcenstein D, Garnham AL, Naik SH, Smyth GK, Thomas T, Voss AK, Coultas L. Correction: The histone acetyltransferase HBO1 promotes efficient tip cell sprouting during angiogenesis. Development 2021; 148:273800. [PMID: 34927679 DOI: 10.1242/dev.200377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Zoe L Grant
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Peter F Hickey
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Waruni Abeysekera
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Lachlan Whitehead
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Sabrina M Lewis
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Robert C A Symons
- Department of Optometry and Vision Sciences, University of Melbourne, Parkville 3010, Australia.,Department of Surgery, University of Melbourne, Parkville 3010, Australia.,Department of Ophthalmology, Royal Melbourne Hospital, Parkville 3050, Australia
| | - Tracey M Baldwin
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia
| | - Daniela Amann-Zalcenstein
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Alexandra L Garnham
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Shalin H Naik
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Gordon K Smyth
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,School of Mathematics and Statistics, University of Melbourne, Parkville, VIC 3010, Australia
| | - Tim Thomas
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Anne K Voss
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Leigh Coultas
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
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8
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You Y, Tian L, Su S, Dong X, Jabbari JS, Hickey PF, Ritchie ME. Benchmarking UMI-based single-cell RNA-seq preprocessing workflows. Genome Biol 2021; 22:339. [PMID: 34906205 PMCID: PMC8672463 DOI: 10.1186/s13059-021-02552-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 11/22/2021] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Single-cell RNA-sequencing (scRNA-seq) technologies and associated analysis methods have rapidly developed in recent years. This includes preprocessing methods, which assign sequencing reads to genes to create count matrices for downstream analysis. While several packaged preprocessing workflows have been developed to provide users with convenient tools for handling this process, how they compare to one another and how they influence downstream analysis have not been well studied. RESULTS Here, we systematically benchmark the performance of 10 end-to-end preprocessing workflows (Cell Ranger, Optimus, salmon alevin, alevin-fry, kallisto bustools, dropSeqPipe, scPipe, zUMIs, celseq2, and scruff) using datasets yielding different biological complexity levels generated by CEL-Seq2 and 10x Chromium platforms. We compare these workflows in terms of their quantification properties directly and their impact on normalization and clustering by evaluating the performance of different method combinations. While the scRNA-seq preprocessing workflows compared vary in their detection and quantification of genes across datasets, after downstream analysis with performant normalization and clustering methods, almost all combinations produce clustering results that agree well with the known cell type labels that provided the ground truth in our analysis. CONCLUSIONS In summary, the choice of preprocessing method was found to be less important than other steps in the scRNA-seq analysis process. Our study comprehensively compares common scRNA-seq preprocessing workflows and summarizes their characteristics to guide workflow users.
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Affiliation(s)
- Yue You
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
| | - Luyi Tian
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
| | - Shian Su
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
| | - Xueyi Dong
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
| | - Jafar S. Jabbari
- Australian Genome Research Facility, Victorian Comprehensive Cancer Centre, Melbourne, Australia
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, The University of Melbourne at The Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Peter F. Hickey
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
- Single-Cell Open Research Endeavour (SCORE), The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
| | - Matthew E. Ritchie
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Australia
- School of Mathematics and Statistics, The University of Melbourne, Parkville, Australia
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9
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Su S, Gouil Q, Blewitt ME, Cook D, Hickey PF, Ritchie ME. NanoMethViz: An R/Bioconductor package for visualizing long-read methylation data. PLoS Comput Biol 2021; 17:e1009524. [PMID: 34695109 PMCID: PMC8568149 DOI: 10.1371/journal.pcbi.1009524] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 02/05/2021] [Revised: 11/04/2021] [Accepted: 10/04/2021] [Indexed: 12/13/2022] Open
Abstract
A key benefit of long-read nanopore sequencing technology is the ability to detect modified DNA bases, such as 5-methylcytosine. The lack of R/Bioconductor tools for the effective visualization of nanopore methylation profiles between samples from different experimental groups led us to develop the NanoMethViz R package. Our software can handle methylation output generated from a range of different methylation callers and manages large datasets using a compressed data format. To fully explore the methylation patterns in a dataset, NanoMethViz allows plotting of data at various resolutions. At the sample-level, we use dimensionality reduction to look at the relationships between methylation profiles in an unsupervised way. We visualize methylation profiles of classes of features such as genes or CpG islands by scaling them to relative positions and aggregating their profiles. At the finest resolution, we visualize methylation patterns across individual reads along the genome using the spaghetti plot and heatmaps, allowing users to explore particular genes or genomic regions of interest. In summary, our software makes the handling of methylation signal more convenient, expands upon the visualization options for nanopore data and works seamlessly with existing methylation analysis tools available in the Bioconductor project. Our software is available at https://bioconductor.org/packages/NanoMethViz.
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Affiliation(s)
- Shian Su
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Biology, The University of Melbourne, Melbourne, Australia
- * E-mail: (SS); (MER)
| | - Quentin Gouil
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Biology, The University of Melbourne, Melbourne, Australia
| | - Marnie E. Blewitt
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Biology, The University of Melbourne, Melbourne, Australia
| | - Dianne Cook
- Econometrics & Business Statistics, Monash University, Melbourne, Australia
| | - Peter F. Hickey
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Biology, The University of Melbourne, Melbourne, Australia
| | - Matthew E. Ritchie
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
- Department of Medical Biology, The University of Melbourne, Melbourne, Australia
- * E-mail: (SS); (MER)
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10
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Grant ZL, Hickey PF, Abeysekera W, Whitehead L, Lewis SM, Symons RCA, Baldwin TM, Amann-Zalcenstein D, Garnham AL, Smyth GK, Thomas T, Voss AK, Coultas L. The histone acetyltransferase HBO1 promotes efficient tip cell sprouting during angiogenesis. Development 2021; 148:272249. [PMID: 34550360 DOI: 10.1242/dev.199581] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 09/15/2021] [Indexed: 12/14/2022]
Abstract
Blood vessel growth and remodelling are essential during embryonic development and disease pathogenesis. The diversity of endothelial cells (ECs) is transcriptionally evident and ECs undergo dynamic changes in gene expression during vessel growth and remodelling. Here, we investigated the role of the histone acetyltransferase HBO1 (KAT7), which is important for activating genes during development and for histone H3 lysine 14 acetylation (H3K14ac). Loss of HBO1 and H3K14ac impaired developmental sprouting angiogenesis and reduced pathological EC overgrowth in the retinal endothelium. Single-cell RNA sequencing of retinal ECs revealed an increased abundance of tip cells in Hbo1-deficient retinas, which led to EC overcrowding in the retinal sprouting front and prevented efficient tip cell migration. We found that H3K14ac was highly abundant in the endothelial genome in both intra- and intergenic regions, suggesting that HBO1 acts as a genome organiser that promotes efficient tip cell behaviour necessary for sprouting angiogenesis. This article has an associated 'The people behind the papers' interview.
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Affiliation(s)
- Zoe L Grant
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Peter F Hickey
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Waruni Abeysekera
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Lachlan Whitehead
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Sabrina M Lewis
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Robert C A Symons
- Department of Optometry and Vision Sciences, University of Melbourne, Parkville, 3010, Australia.,Department of Surgery, University of Melbourne, Parkville, 3010, Australia.,Department of Ophthalmology, Royal Melbourne Hospital, Parkville, 3050, Australia
| | - Tracey M Baldwin
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia
| | - Daniela Amann-Zalcenstein
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Alexandra L Garnham
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Gordon K Smyth
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,School of Mathematics and Statistics, University of Melbourne, Parkville, VIC 3010, Australia
| | - Tim Thomas
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Anne K Voss
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
| | - Leigh Coultas
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia
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11
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Weber LM, Hippen AA, Hickey PF, Berrett KC, Gertz J, Doherty JA, Greene CS, Hicks SC. Genetic demultiplexing of pooled single-cell RNA-sequencing samples in cancer facilitates effective experimental design. Gigascience 2021; 10:giab062. [PMID: 34553212 PMCID: PMC8458035 DOI: 10.1093/gigascience/giab062] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 07/19/2021] [Accepted: 08/26/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Pooling cells from multiple biological samples prior to library preparation within the same single-cell RNA sequencing experiment provides several advantages, including lower library preparation costs and reduced unwanted technological variation, such as batch effects. Computational demultiplexing tools based on natural genetic variation between individuals provide a simple approach to demultiplex samples, which does not require complex additional experimental procedures. However, to our knowledge these tools have not been evaluated in cancer, where somatic variants, which could differ between cells from the same sample, may obscure the signal in natural genetic variation. RESULTS Here, we performed in silico benchmark evaluations by combining raw sequencing reads from multiple single-cell samples in high-grade serous ovarian cancer, which has a high copy number burden, and lung adenocarcinoma, which has a high tumor mutational burden. Our results confirm that genetic demultiplexing tools can be effectively deployed on cancer tissue using a pooled experimental design, although high proportions of ambient RNA from cell debris reduce performance. CONCLUSIONS This strategy provides significant cost savings through pooled library preparation. To facilitate similar analyses at the experimental design phase, we provide freely accessible code and a reproducible Snakemake workflow built around the best-performing tools found in our in silico benchmark evaluations, available at https://github.com/lmweber/snp-dmx-cancer.
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Affiliation(s)
- Lukas M Weber
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
| | - Ariel A Hippen
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Peter F Hickey
- Advanced Technology & Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia
| | - Kristofer C Berrett
- Huntsman Cancer Institute and Department of Population Health Sciences, University of Utah, Salt Lake City, UT 84108, USA
| | - Jason Gertz
- Huntsman Cancer Institute and Department of Population Health Sciences, University of Utah, Salt Lake City, UT 84108, USA
| | - Jennifer Anne Doherty
- Huntsman Cancer Institute and Department of Population Health Sciences, University of Utah, Salt Lake City, UT 84108, USA
| | - Casey S Greene
- Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Stephanie C Hicks
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
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12
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Su S, Tian L, Dong X, Hickey PF, Freytag S, Ritchie ME. CellBench: R/Bioconductor software for comparing single-cell RNA-seq analysis methods. Bioinformatics 2020; 36:2288-2290. [PMID: 31778143 PMCID: PMC7141847 DOI: 10.1093/bioinformatics/btz889] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 10/03/2019] [Accepted: 11/26/2019] [Indexed: 11/13/2022] Open
Abstract
MOTIVATION Bioinformatic analysis of single-cell gene expression data is a rapidly evolving field. Hundreds of bespoke methods have been developed in the past few years to deal with various aspects of single-cell analysis and consensus on the most appropriate methods to use under different settings is still emerging. Benchmarking the many methods is therefore of critical importance and since analysis of single-cell data usually involves multi-step pipelines, effective evaluation of pipelines involving different combinations of methods is required. Current benchmarks of single-cell methods are mostly implemented with ad-hoc code that is often difficult to reproduce or extend, and exhaustive manual coding of many combinations is infeasible in most instances. Therefore, new software is needed to manage pipeline benchmarking. RESULTS The CellBench R software facilitates method comparisons in either a task-centric or combinatorial way to allow pipelines of methods to be evaluated in an effective manner. CellBench automatically runs combinations of methods, provides facilities for measuring running time and delivers output in tabular form which is highly compatible with tidyverse R packages for summary and visualization. Our software has enabled comprehensive benchmarking of single-cell RNA-seq normalization, imputation, clustering, trajectory analysis and data integration methods using various performance metrics obtained from data with available ground truth. CellBench is also amenable to benchmarking other bioinformatics analysis tasks. AVAILABILITY AND IMPLEMENTATION Available from https://bioconductor.org/packages/CellBench.
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Affiliation(s)
- Shian Su
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia.,Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Luyi Tian
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia.,Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Xueyi Dong
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia.,Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Peter F Hickey
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia.,Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Saskia Freytag
- Epigenetics and Genomics, Harry Perkins Institute of Medical Research, Nedlands, WA 6009, Australia
| | - Matthew E Ritchie
- Epigenetics and Development Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia.,Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia.,School of Mathematics and Statistics, The University of Melbourne, Parkville, VIC 3010, Australia
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13
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Koay HF, Su S, Amann-Zalcenstein D, Daley SR, Comerford I, Whyte CE, Konstantinov IE, d’Udekem Y, Baldwin T, Hickey PF, Berzins SP, Mak JY, Kallies A, Chen Z, Nussing S, Kedzierska K, Mackay LK, McColl SR, Deenick EK, Fairlie DP, McCluskey J, Goodnow CC, Ritchie ME, Belz GT, Naik SH, Pellicci DG, Godfrey DI. A divergent transcriptional landscape underpins the development and functional branching of MAIT cells. The Journal of Immunology 2020. [DOI: 10.4049/jimmunol.204.supp.223.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
MR1-restricted mucosal-associated invariant T (MAIT) cells play a unique role in the immune system. These cells develop intrathymically through a three-stage process, but the events that regulate this are largely unknown. Here, using bulk and single-cell RNA sequencing–based transcriptomic analysis in mice and humans, we studied the changing transcriptional landscape that accompanies transition through each stage. Many transcripts were sharply modulated during MAIT cell development, including SLAM (signaling lymphocytic activation molecule) family members, chemokine receptors, and transcription factors. We also demonstrate that stage 3 “mature” MAIT cells comprise distinct subpopulations including newly arrived transitional stage 3 cells, interferon-γ–producing MAIT1 cells and interleukin-17–producing MAIT17 cells. Moreover, the validity and importance of several transcripts detected in this study are directly demonstrated using specific mutant mice. For example, MAIT cell intrathymic maturation was found to be halted in SLAM-associated protein (SAP)–deficient and CXCR6-deficient mouse models, providing clear evidence for their role in modulating MAIT cell development. These data underpin a model that maps the changing transcriptional landscape and identifies key factors that regulate the process of MAIT cell differentiation, with many parallels between mice and humans.
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Affiliation(s)
- Hui Fern Koay
- 1The Peter Doherty Institute for Infection and Immunity, Univ. Melbourne, Australia
- 2The University of Melbourne, Australia
| | - Shian Su
- 3The Walter and Eliza Hall Institute of Medical Research, Australia, Australia
| | | | - Stephen R Daley
- 4The John Curtin School of Medical Research, The Australian National University, Australia
| | | | | | | | - Yves d’Udekem
- 6Murdoch Children’s Research Institute, Victoria, Australia, Australia
| | - Tracey Baldwin
- 3The Walter and Eliza Hall Institute of Medical Research, Australia, Australia
| | - Peter F Hickey
- 3The Walter and Eliza Hall Institute of Medical Research, Australia, Australia
| | | | - Jeffrey Y.W. Mak
- 8Institute for Molecular Bioscience, University of Queensland, Australia
| | - Axel Kallies
- 1The Peter Doherty Institute for Infection and Immunity, Univ. Melbourne, Australia
| | - Zhenjun Chen
- 1The Peter Doherty Institute for Infection and Immunity, Univ. Melbourne, Australia
| | - Simone Nussing
- 1The Peter Doherty Institute for Infection and Immunity, Univ. Melbourne, Australia
| | - Katherine Kedzierska
- 1The Peter Doherty Institute for Infection and Immunity, Univ. Melbourne, Australia
| | - Laura K Mackay
- 1The Peter Doherty Institute for Infection and Immunity, Univ. Melbourne, Australia
| | | | | | - David P Fairlie
- 8Institute for Molecular Bioscience, University of Queensland, Australia
| | - James McCluskey
- 1The Peter Doherty Institute for Infection and Immunity, Univ. Melbourne, Australia
| | | | - Matthew E Ritchie
- 3The Walter and Eliza Hall Institute of Medical Research, Australia, Australia
| | - Gabrielle T Belz
- 3The Walter and Eliza Hall Institute of Medical Research, Australia, Australia
| | - Shalin H Naik
- 3The Walter and Eliza Hall Institute of Medical Research, Australia, Australia
| | - Daniel G Pellicci
- 1The Peter Doherty Institute for Infection and Immunity, Univ. Melbourne, Australia
| | - Dale I Godfrey
- 1The Peter Doherty Institute for Infection and Immunity, Univ. Melbourne, Australia
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14
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Jansz N, Nesterova T, Keniry A, Iminitoff M, Hickey PF, Pintacuda G, Masui O, Kobelke S, Geoghegan N, Breslin KA, Willson TA, Rogers K, Kay GF, Fox AH, Koseki H, Brockdorff N, Murphy JM, Blewitt ME. Smchd1 Targeting to the Inactive X Is Dependent on the Xist-HnrnpK-PRC1 Pathway. Cell Rep 2019; 25:1912-1923.e9. [PMID: 30428357 DOI: 10.1016/j.celrep.2018.10.044] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 09/06/2018] [Accepted: 10/11/2018] [Indexed: 01/08/2023] Open
Abstract
We and others have recently reported that the SMC protein Smchd1 is a regulator of chromosome conformation. Smchd1 is critical for the structure of the inactive X chromosome and at autosomal targets such as the Hox genes. However, it is unknown how Smchd1 is recruited to these sites. Here, we report that Smchd1 localizes to the inactive X via the Xist-HnrnpK-PRC1 (polycomb repressive complex 1) pathway. Contrary to previous reports, Smchd1 does not bind Xist or other RNA molecules with any specificity. Rather, the localization of Smchd1 to the inactive X is H2AK119ub dependent. Following perturbation of this interaction, Smchd1 is destabilized, which has consequences for gene silencing genome-wide. Our work adds Smchd1 to the PRC1 silencing pathway for X chromosome inactivation.
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Affiliation(s)
- Natasha Jansz
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia; Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Tatyana Nesterova
- Developmental Epigenetics, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Andrew Keniry
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia; Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Megan Iminitoff
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia
| | - Peter F Hickey
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia; Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Greta Pintacuda
- Developmental Epigenetics, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Osamu Masui
- Centre for Integrative Medical Sciences, RIKEN Yokohama Institute, 1-7-22, Suehiro-cho, Tsurumi, Yokohama, Kanagawa 230-0045, Japan
| | - Simon Kobelke
- School of Human Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Niall Geoghegan
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia; Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Kelsey A Breslin
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia
| | - Tracy A Willson
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia
| | - Kelly Rogers
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia; Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Graham F Kay
- QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia
| | - Archa H Fox
- School of Human Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Haruhiko Koseki
- Centre for Integrative Medical Sciences, RIKEN Yokohama Institute, 1-7-22, Suehiro-cho, Tsurumi, Yokohama, Kanagawa 230-0045, Japan
| | - Neil Brockdorff
- Developmental Epigenetics, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - James M Murphy
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia; Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Marnie E Blewitt
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052, Australia; Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010, Australia; Department of Genetics, University of Melbourne, Melbourne, VIC 3010, Australia.
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15
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Koay HF, Su S, Amann-Zalcenstein D, Daley SR, Comerford I, Miosge L, Whyte CE, Konstantinov IE, d'Udekem Y, Baldwin T, Hickey PF, Berzins SP, Mak JYW, Sontani Y, Roots CM, Sidwell T, Kallies A, Chen Z, Nüssing S, Kedzierska K, Mackay LK, McColl SR, Deenick EK, Fairlie DP, McCluskey J, Goodnow CC, Ritchie ME, Belz GT, Naik SH, Pellicci DG, Godfrey DI. A divergent transcriptional landscape underpins the development and functional branching of MAIT cells. Sci Immunol 2019; 4:eaay6039. [PMID: 31757835 PMCID: PMC10627559 DOI: 10.1126/sciimmunol.aay6039] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [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: 07/02/2019] [Accepted: 10/15/2019] [Indexed: 12/11/2022]
Abstract
MR1-restricted mucosal-associated invariant T (MAIT) cells play a unique role in the immune system. These cells develop intrathymically through a three-stage process, but the events that regulate this are largely unknown. Here, using bulk and single-cell RNA sequencing-based transcriptomic analysis in mice and humans, we studied the changing transcriptional landscape that accompanies transition through each stage. Many transcripts were sharply modulated during MAIT cell development, including SLAM (signaling lymphocytic activation molecule) family members, chemokine receptors, and transcription factors. We also demonstrate that stage 3 "mature" MAIT cells comprise distinct subpopulations including newly arrived transitional stage 3 cells, interferon-γ-producing MAIT1 cells and interleukin-17-producing MAIT17 cells. Moreover, the validity and importance of several transcripts detected in this study are directly demonstrated using specific mutant mice. For example, MAIT cell intrathymic maturation was found to be halted in SLAM-associated protein (SAP)-deficient and CXCR6-deficient mouse models, providing clear evidence for their role in modulating MAIT cell development. These data underpin a model that maps the changing transcriptional landscape and identifies key factors that regulate the process of MAIT cell differentiation, with many parallels between mice and humans.
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Affiliation(s)
- H-F Koay
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
- Australian Research Council Centre of Excellence for Advanced Molecular Imaging, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - S Su
- Epigenetics and Development Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Single Cell Open Research Endeavour (SCORE), Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
| | - D Amann-Zalcenstein
- Single Cell Open Research Endeavour (SCORE), Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Immunology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Department of Medical Biology, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - S R Daley
- Department of Immunology and Infectious Disease, John Curtin School of Medical Research, Australian National University, Canberra, Australia
| | - I Comerford
- Department of Molecular and Biomedical Science, University of Adelaide, Adelaide, South Australia 5005, Australia
| | - L Miosge
- Department of Immunology and Infectious Disease, John Curtin School of Medical Research, Australian National University, Canberra, Australia
| | - C E Whyte
- Department of Molecular and Biomedical Science, University of Adelaide, Adelaide, South Australia 5005, Australia
| | - I E Konstantinov
- Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia
- Melbourne Children's Centre for Cardiovascular Genomics and Regenerative Medicine, Murdoch Children's Research Institute, Victoria 3052, Australia
- Murdoch Children's Research Institute, Victoria 3052, Australia
| | - Y d'Udekem
- Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia
- Melbourne Children's Centre for Cardiovascular Genomics and Regenerative Medicine, Murdoch Children's Research Institute, Victoria 3052, Australia
- Murdoch Children's Research Institute, Victoria 3052, Australia
| | - T Baldwin
- Single Cell Open Research Endeavour (SCORE), Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Department of Medical Biology, University of Melbourne, Melbourne, Victoria 3010, Australia
- Blood Cells and Blood Cancer Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
| | - P F Hickey
- Single Cell Open Research Endeavour (SCORE), Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
| | - S P Berzins
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
- Federation University Australia, Ballarat, Victoria 3350, Australia
- Fiona Elsey Cancer Research Institute, Ballarat, Victoria 3350, Australia
| | - J Y W Mak
- Division of Chemistry and Structural Biology, and Centre for Inflammation and Disease Research, Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland 4072, Australia
- Australian Research Council Centre of Excellence for Advanced Molecular Imaging, University of Queensland, Brisbane, Queensland 4072, Australia
| | - Y Sontani
- Department of Immunology and Infectious Disease, John Curtin School of Medical Research, Australian National University, Canberra, Australia
| | - C M Roots
- Department of Immunology and Infectious Disease, John Curtin School of Medical Research, Australian National University, Canberra, Australia
| | - T Sidwell
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - A Kallies
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Z Chen
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - S Nüssing
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - K Kedzierska
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - L K Mackay
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
- Australian Research Council Centre of Excellence for Advanced Molecular Imaging, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - S R McColl
- Department of Molecular and Biomedical Science, University of Adelaide, Adelaide, South Australia 5005, Australia
| | - E K Deenick
- Garvan Institute of Medical Research, Sydney, Australia
- St. Vincent's Clinical School, Faculty of Medicine, University of New South Wales (UNSW), Sydney, Australia
| | - D P Fairlie
- Division of Chemistry and Structural Biology, and Centre for Inflammation and Disease Research, Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland 4072, Australia
- Australian Research Council Centre of Excellence for Advanced Molecular Imaging, University of Queensland, Brisbane, Queensland 4072, Australia
| | - J McCluskey
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - C C Goodnow
- Garvan Institute of Medical Research, Sydney, Australia
- UNSW Cellular Genomics Futures Institute, UNSW, Sydney, Australia
| | - M E Ritchie
- Epigenetics and Development Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Department of Medical Biology, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - G T Belz
- Immunology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Department of Medical Biology, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - S H Naik
- Single Cell Open Research Endeavour (SCORE), Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Immunology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Department of Medical Biology, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - D G Pellicci
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia.
- Australian Research Council Centre of Excellence for Advanced Molecular Imaging, University of Melbourne, Melbourne, Victoria 3000, Australia
- Murdoch Children's Research Institute, Victoria 3052, Australia
| | - D I Godfrey
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia.
- Australian Research Council Centre of Excellence for Advanced Molecular Imaging, University of Melbourne, Melbourne, Victoria 3000, Australia
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16
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Hickey JT, Timmins RG, Maniar N, Rio E, Hickey PF, Pitcher CA, Williams MD, Opar DA. Pain-Free Versus Pain-Threshold Rehabilitation Following Acute Hamstring Strain Injury: A Randomized Controlled Trial. J Orthop Sports Phys Ther 2019:1-35. [PMID: 31253060 DOI: 10.2519/jospt.2019.8895] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
STUDY DESIGN Randomized controlled trial. BACKGROUND Conventional guidelines recommend hamstring strain injury (HSI) rehabilitation should only be performed and progressed in complete absence of pain, despite lack of comparison to alternative approaches. OBJECTIVES The primary aim of this study was to compare the number of days from acute HSI to return to play (RTP) clearance following a standardised rehabilitation protocol performed within either pain-free or pain-threshold limits. The secondary aims were to compare isometric knee flexor strength, biceps femoris long head (BFlh) fascicle length, fear of movement and re-injury during a six-month follow-up between pain-free and pain-threshold groups. METHODS Forty-three men with acute HSIs were randomly allocated to either a pain-free (n=22) or pain-threshold (n=21) rehabilitation group. Days from HSI to RTP clearance, isometric knee flexor strength, BFlh fascicle length, fear of movement and re-injuries within six-month follow-up were reported. RESULTS The median time from HSI to RTP clearance was 15 days (95% CI = 13 to 17) in the pain-free group and 17 days (95% CI = 11 to 24) in the pain-threshold group, which was not significantly different (p = 0.37). Recovery of isometric knee flexor strength at 90/90 degrees of hip/knee flexion was greater in the pain-threshold group at RTP clearance by 15% (95% CI = 1 to 28) and by 15% (95% CI = 1 to 29) at two-month follow-up. BFlh fascicles were 0.91cm (95% CI = 0.34 to 1.48) longer at two-month follow-up in the pain-threshold group. Two re-injuries occurred in both the pain-free and pain-threshold group during six-month follow-up. CONCLUSION Pain-threshold rehabilitation did not accelerate RTP clearance but did result in greater recovery of isometric knee flexor strength and better maintenance of BFlh fascicle length improvements compared to pain-free rehabilitation. J Orthop Sports Phys Ther, Epub 28 Jun 2019. doi:10.2519/jospt.2019.8895.
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Affiliation(s)
- Jack T Hickey
- School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Australia
| | - Ryan G Timmins
- School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Australia
| | - Nirav Maniar
- School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Australia
| | - Ebonie Rio
- La Trobe Centre for Sports and Exercise Medicine Research, Melbourne, Australia
| | - Peter F Hickey
- Epigenetics and Development Division, Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia
| | - Christian A Pitcher
- School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Australia
| | - Morgan D Williams
- School of Health, Sport and Professional Practice, University of South Wales, Pontypridd, Wales, UK
| | - David A Opar
- School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Australia
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17
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Boukas L, Havrilla JM, Hickey PF, Quinlan AR, Bjornsson HT, Hansen KD. Coexpression patterns define epigenetic regulators associated with neurological dysfunction. Genome Res 2019; 29:532-542. [PMID: 30858344 PMCID: PMC6442390 DOI: 10.1101/gr.239442.118] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [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: 05/14/2018] [Accepted: 02/07/2019] [Indexed: 01/12/2023]
Abstract
Coding variants in epigenetic regulators are emerging as causes of neurological dysfunction and cancer. However, a comprehensive effort to identify disease candidates within the human epigenetic machinery (EM) has not been performed; it is unclear whether features exist that distinguish between variation-intolerant and variation-tolerant EM genes, and between EM genes associated with neurological dysfunction versus cancer. Here, we rigorously define 295 genes with a direct role in epigenetic regulation (writers, erasers, remodelers, readers). Systematic exploration of these genes reveals that although individual enzymatic functions are always mutually exclusive, readers often also exhibit enzymatic activity (dual-function EM genes). We find that the majority of EM genes are very intolerant to loss-of-function variation, even when compared to the dosage sensitive transcription factors, and we identify 102 novel EM disease candidates. We show that this variation intolerance is driven by the protein domains encoding the epigenetic function, suggesting that disease is caused by a perturbed chromatin state. We then describe a large subset of EM genes that are coexpressed within multiple tissues. This subset is almost exclusively populated by extremely variation-intolerant genes and shows enrichment for dual-function EM genes. It is also highly enriched for genes associated with neurological dysfunction, even when accounting for dosage sensitivity, but not for cancer-associated EM genes. Finally, we show that regulatory regions near epigenetic regulators are genetically important for common neurological traits. These findings prioritize novel disease candidate EM genes and suggest that this coexpression plays a functional role in normal neurological homeostasis.
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Affiliation(s)
- Leandros Boukas
- Human Genetics Training Program, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
| | - James M Havrilla
- Department of Human Genetics, University of Utah, Salt Lake City, Utah 84112, USA
| | - Peter F Hickey
- Molecular Medicine Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Department of Medical Biology, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Aaron R Quinlan
- Department of Human Genetics, University of Utah, Salt Lake City, Utah 84112, USA
- Department of Biomedical Informatics, University of Utah, Salt Lake City, Utah 84108, USA
- USTAR Center for Genetic Discovery, University of Utah, Salt Lake City, Utah 84108, USA
| | - Hans T Bjornsson
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
- Faculty of Medicine, University of Iceland, 101 Reykjavík, Iceland
- Landspitali University Hospital, 101 Reykjavík, Iceland
| | - Kasper D Hansen
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205, USA
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18
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Rizzardi LF, Hickey PF, Rodriguez DiBlasi V, Tryggvadóttir R, Callahan CM, Idrizi A, Hansen KD, Feinberg AP. Neuronal brain-region-specific DNA methylation and chromatin accessibility are associated with neuropsychiatric trait heritability. Nat Neurosci 2019; 22:307-316. [PMID: 30643296 PMCID: PMC6348048 DOI: 10.1038/s41593-018-0297-8] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 11/13/2018] [Indexed: 12/21/2022]
Abstract
Epigenetic modifications confer stable transcriptional patterns in the brain and both normal and abnormal brain function involve specialized brain regions. We examined DNA methylation by whole genome bisulfite sequencing in neuronal and non-neuronal populations from four brain regions (anterior cingulate gyrus, hippocampus, prefrontal cortex, and nucleus accumbens) as well as chromatin accessibility in the latter two. We find pronounced differences in CpG and non-CpG differentially methylated regions (CG- and CH-DMRs) only in neuronal cells across regions. While neuronal CH-DMRs were highly associated with differential gene expression, CG-DMRs were consistent with chromatin accessibility and enriched for regulatory regions. These CG-DMRs comprise ~12 Mb of the genome that is highly enriched for genomic regions associated with heritability of neuropsychiatric traits including addictive behavior, schizophrenia, and neuroticism, suggesting a mechanistic link between pathology and differential neuron-specific epigenetic regulation in distinct brain regions.
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Affiliation(s)
- Lindsay F Rizzardi
- Center for Epigenetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Peter F Hickey
- Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
| | - Varenka Rodriguez DiBlasi
- Center for Epigenetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Rakel Tryggvadóttir
- Center for Epigenetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Colin M Callahan
- Center for Epigenetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Adrian Idrizi
- Center for Epigenetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Kasper D Hansen
- Center for Epigenetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA. .,Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA. .,McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
| | - Andrew P Feinberg
- Center for Epigenetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA. .,Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA. .,Department of Biomedical Engineering, Whiting School of Engineering, Johns Hopkins University, Baltimore, MD, USA. .,Department of Mental Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA.
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19
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Keniry A, Gearing LJ, Jansz N, Liu J, Holik AZ, Hickey PF, Kinkel SA, Moore DL, Breslin K, Chen K, Liu R, Phillips C, Pakusch M, Biben C, Sheridan JM, Kile BT, Carmichael C, Ritchie ME, Hilton DJ, Blewitt ME. Setdb1-mediated H3K9 methylation is enriched on the inactive X and plays a role in its epigenetic silencing. Epigenetics Chromatin 2016; 9:16. [PMID: 27195021 PMCID: PMC4870784 DOI: 10.1186/s13072-016-0064-6] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 03/31/2016] [Indexed: 11/16/2022] Open
Abstract
Background
The presence of histone 3 lysine 9 (H3K9) methylation on the mouse inactive X chromosome has been controversial over the last 15 years, and the functional role of H3K9 methylation in X chromosome inactivation in any species has remained largely unexplored. Results Here we report the first genomic analysis of H3K9 di- and tri-methylation on the inactive X: we find they are enriched at the intergenic, gene poor regions of the inactive X, interspersed between H3K27 tri-methylation domains found in the gene dense regions. Although H3K9 methylation is predominantly non-genic, we find that depletion of H3K9 methylation via depletion of H3K9 methyltransferase Set domain bifurcated 1 (Setdb1) during the establishment of X inactivation, results in failure of silencing for around 150 genes on the inactive X. By contrast, we find a very minor role for Setdb1-mediated H3K9 methylation once X inactivation is fully established. In addition to failed gene silencing, we observed a specific failure to silence X-linked long-terminal repeat class repetitive elements. Conclusions Here we have shown that H3K9 methylation clearly marks the murine inactive X chromosome. The role of this mark is most apparent during the establishment phase of gene silencing, with a more muted effect on maintenance of the silent state. Based on our data, we hypothesise that Setdb1-mediated H3K9 methylation plays a role in epigenetic silencing of the inactive X via silencing of the repeats, which itself facilitates gene silencing through alterations to the conformation of the whole inactive X chromosome. Electronic supplementary material The online version of this article (doi:10.1186/s13072-016-0064-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Andrew Keniry
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Linden J Gearing
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Natasha Jansz
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Joy Liu
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia
| | - Aliaksei Z Holik
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Peter F Hickey
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Mathematics and Statistics, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Sarah A Kinkel
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Darcy L Moore
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Kelsey Breslin
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia
| | - Kelan Chen
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Ruijie Liu
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia
| | - Catherine Phillips
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia
| | - Miha Pakusch
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia
| | - Christine Biben
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Julie M Sheridan
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Benjamin T Kile
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Catherine Carmichael
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Matthew E Ritchie
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia.,Department of Mathematics and Statistics, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Douglas J Hilton
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Marnie E Blewitt
- The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Melbourne, VIC 3052 Australia.,Department of Medical Biology, University of Melbourne, Melbourne, VIC 3010 Australia.,Department of Genetics, University of Melbourne, Melbourne, VIC 3010 Australia
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20
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Phelan DG, Anderson DJ, Howden SE, Wong RCB, Hickey PF, Pope K, Wilson GR, Pébay A, Davis AM, Petrou S, Elefanty AG, Stanley EG, James PA, Macciocca I, Bahlo M, Cheung MM, Amor DJ, Elliott DA, Lockhart PJ. ALPK3-deficient cardiomyocytes generated from patient-derived induced pluripotent stem cells and mutant human embryonic stem cells display abnormal calcium handling and establish that ALPK3 deficiency underlies familial cardiomyopathy. Eur Heart J 2016; 37:2586-90. [PMID: 27106955 DOI: 10.1093/eurheartj/ehw160] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 03/13/2016] [Indexed: 12/31/2022] Open
Abstract
AIMS We identified a novel homozygous truncating mutation in the gene encoding alpha kinase 3 (ALPK3) in a family presenting with paediatric cardiomyopathy. A recent study identified biallelic truncating mutations of ALPK3 in three unrelated families; therefore, there is strong genetic evidence that ALPK3 mutation causes cardiomyopathy. This study aimed to clarify the mutation mechanism and investigate the molecular and cellular pathogenesis underlying ALPK3-mediated cardiomyopathy. METHODS AND RESULTS We performed detailed clinical and genetic analyses of a consanguineous family, identifying a new ALPK3 mutation (c.3792G>A, p.W1264X) which undergoes nonsense-mediated decay in ex vivo and in vivo tissues. Ultra-structural analysis of cardiomyocytes derived from patient-specific and human ESC-derived stem cell lines lacking ALPK3 revealed disordered sarcomeres and intercalated discs. Multi-electrode array analysis and calcium imaging demonstrated an extended field potential duration and abnormal calcium handling in mutant contractile cultures. CONCLUSIONS This study validates the genetic evidence, suggesting that mutations in ALPK3 can cause familial cardiomyopathy and demonstrates loss of function as the underlying genetic mechanism. We show that ALPK3-deficient cardiomyocytes derived from pluripotent stem cell models recapitulate the ultrastructural and electrophysiological defects observed in vivo. Analysis of differentiated contractile cultures identified abnormal calcium handling as a potential feature of cardiomyocytes lacking ALPK3, providing functional insights into the molecular mechanisms underlying ALPK3-mediated cardiomyopathy.
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Affiliation(s)
- Dean G Phelan
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Childrens Research Institute, Flemington Road, Parkville 3052, Victoria, Australia Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville 3052, Victoria, Australia
| | - David J Anderson
- Murdoch Childrens Research Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Victoria, Australia
| | - Sara E Howden
- Murdoch Childrens Research Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Victoria, Australia Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville 3052, Victoria, Australia
| | - Raymond C B Wong
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital; Ophthalmology, Department of Surgery, University of Melbourne, 32 Gisborne Street, East Melbourne 3002, Victoria, Australia
| | - Peter F Hickey
- Population Health and Immunity Division, Walter and Eliza Hall Institute, 1G Royal Parade, Melbourne 3052, Victoria, Australia
| | - Kate Pope
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Childrens Research Institute, Flemington Road, Parkville 3052, Victoria, Australia
| | - Gabrielle R Wilson
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Childrens Research Institute, Flemington Road, Parkville 3052, Victoria, Australia Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville 3052, Victoria, Australia
| | - Alice Pébay
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital; Ophthalmology, Department of Surgery, University of Melbourne, 32 Gisborne Street, East Melbourne 3002, Victoria, Australia
| | - Andrew M Davis
- Murdoch Childrens Research Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Victoria, Australia Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville 3052, Victoria, Australia Department of Cardiology, The Royal Children's Hospital, Parkville 3052, Victoria, Australia
| | - Steven Petrou
- The Florey Institute for Neuroscience and Mental Health, The University of Melbourne, Parkville 3052, Victoria, Australia
| | - Andrew G Elefanty
- Murdoch Childrens Research Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Victoria, Australia Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville 3052, Victoria, Australia Department of Anatomy and Developmental Biology, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton 3800, Victoria, Australia
| | - Edouard G Stanley
- Murdoch Childrens Research Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Victoria, Australia Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville 3052, Victoria, Australia Department of Anatomy and Developmental Biology, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton 3800, Victoria, Australia
| | - Paul A James
- Genetic Medicine, Royal Melbourne Hospital, Parkville 3052, Victoria, Australia
| | - Ivan Macciocca
- Victorian Clinical Genetics Services, Murdoch Childrens Research Institute, Flemington Road, Parkville 3052, Victoria, Australia
| | - Melanie Bahlo
- Population Health and Immunity Division, Walter and Eliza Hall Institute, 1G Royal Parade, Melbourne 3052, Victoria, Australia Department of Medical Biology, The University of Melbourne, Parkville 3052, Victoria, Australia
| | - Michael M Cheung
- Department of Cardiology, The Royal Children's Hospital, Parkville 3052, Victoria, Australia Murdoch Childrens Research Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Victoria, Australia Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville 3052, Victoria, Australia
| | - David J Amor
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Childrens Research Institute, Flemington Road, Parkville 3052, Victoria, Australia Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville 3052, Victoria, Australia Victorian Clinical Genetics Services, Murdoch Childrens Research Institute, Flemington Road, Parkville 3052, Victoria, Australia
| | - David A Elliott
- Murdoch Childrens Research Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Victoria, Australia School of Biosciences, The University of Melbourne, Parkville 3052, Victoria, Australia
| | - Paul J Lockhart
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Childrens Research Institute, Flemington Road, Parkville 3052, Victoria, Australia Department of Paediatrics, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville 3052, Victoria, Australia
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21
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Hickey PF, Robinson MD. Genomics by the beach. Genome Biol 2014; 15:304. [PMID: 25001045 PMCID: PMC4053725 DOI: 10.1186/gb4171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A report on the 35th Annual Lorne Genome Conference 2014 held in Lorne, Victoria, Australia, February 16–18, 2014.
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Hickey PF, Bahlo M. X chromosome association testing in genome wide association studies. Genet Epidemiol 2011; 35:664-70. [PMID: 21818774 DOI: 10.1002/gepi.20616] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 06/14/2011] [Accepted: 06/15/2011] [Indexed: 11/05/2022]
Abstract
Genome wide association studies (GWAS) have revealed many fascinating insights into complex diseases even from simple, single-marker statistical tests. Most of these tests are designed for testing of associations between a phenotype and an autosomal genotype and are therefore not applicable to X chromosome data. Testing for association on the X chromosome raises unique challenges that have motivated the development of X-specific statistical tests in the literature. However, to date there has been no study of these methods under a wide range of realistic study designs, allele frequencies and disease models to assess the size and power of each test. To address this, we have performed an extensive simulation study to investigate the effects of the sex ratios in the case and control cohorts, as well as the allele frequencies, on the size and power of eight test statistics under three different disease models that each account for X-inactivation. We show that existing, but under-used, methods that make use of both male and female data are uniformly more powerful than popular methods that make use of only female data. In particular, we show that Clayton's one degree of freedom statistic [Clayton, 2008] is robust and powerful across a wide range of realistic simulation parameters. Our results provide guidance on selecting the most appropriate test statistic to analyse X chromosome data from GWAS and show that much power can be gained by a more careful analysis of X chromosome GWAS data.
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Affiliation(s)
- Peter F Hickey
- Bioinformatics Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia.
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Bahlo M, Stankovich J, Danoy P, Hickey PF, Taylor BV, Browning SR, Brown MA, Rubio JP. Saliva-derived DNA performs well in large-scale, high-density single-nucleotide polymorphism microarray studies. Cancer Epidemiol Biomarkers Prev 2010; 19:794-8. [PMID: 20200434 DOI: 10.1158/1055-9965.epi-09-0812] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
As of June 2009, 361 genome-wide association studies (GWAS) had been referenced by the HuGE database. GWAS require DNA from many thousands of individuals, relying on suitable DNA collections. We recently performed a multiple sclerosis (MS) GWAS where a substantial component of the cases (24%) had DNA derived from saliva. Genotyping was done on the Illumina genotyping platform using the Infinium Hap370CNV DUO microarray. Additionally, we genotyped 10 individuals in duplicate using both saliva- and blood-derived DNA. The performance of blood- versus saliva-derived DNA was compared using genotyping call rate, which reflects both the quantity and quality of genotyping per sample and the "GCScore," an Illumina genotyping quality score, which is a measure of DNA quality. We also compared genotype calls and GCScores for the 10 sample pairs. Call rates were assessed for each sample individually. For the GWAS samples, we compared data according to source of DNA and center of origin. We observed high concordance in genotyping quality and quantity between the paired samples and minimal loss of quality and quantity of DNA in the saliva samples in the large GWAS sample, with the blood samples showing greater variation between centers of origin. This large data set highlights the usefulness of saliva DNA for genotyping, especially in high-density single-nucleotide polymorphism microarray studies such as GWAS.
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Affiliation(s)
- Melanie Bahlo
- The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Victoria, Australia.
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Hickey PF, Carosella AM, Feuerstein M. Predicting post treatment spinal strength and flexibility in work-disabled low back pain patients. J Occup Rehabil 1996; 6:251-256. [PMID: 24235023 DOI: 10.1007/bf02110887] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This study examined whether posttreatment trunk strength and flexibility could be predicted from initial trunk strength and flexibility, age, gender, pain severity, diagnosis, length of work disability, return-to-work expectations, anxiety, and fear of reinjury among a group of 96 injured workers with chronic occupational low back pain who completed a multidisciplinary work rehabilitation program. The results indicate that initial average torque in trunk extension, age, gender, and average pain severity contribute significantly to prediction of final average torque in trunk extension. Initial average torque in trunk flexion, age, and gender contributed significantly to prediction of final average torque in trunk flexion, and age and initial range of motion contributed significantly to the prediction of final trunk range of motion. The results indicate that prediction of trunk strength and range of motion can be accomplished from measures of trunk strength and flexibility and pain obtained prior to the onset of rehabilitation. Psychological measures were not predictive of posttreatment trunk strength and flexibility. The ability to predict posttreatment trunk strength should facilitate clinical decision making in these complex cases.
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Affiliation(s)
- P F Hickey
- Occupational Rehabilitation and Ergonomics Center, University of Rochester Medical Center, 2337 Clinton Avenue S., 14618, Rochester, New York
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Hickey PF, Feuerstein M. clinical ergonomic job analysis and consultation: Facilitating work reentry in a case with upper extremity cumulative trauma-related disability. J Occup Rehabil 1993; 3:159-166. [PMID: 24243349 DOI: 10.1007/bf01078285] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The management of work-related recurrent and chronic upper extremity cumulative trauma disorders (UECTDs) represents a challenge particularly when return to work is a treatment goal. Many of these work-related UECTDs may be the consequence of exposure to such physical stressors as repetition, excessive force, awkward and sustained posture in addition to psychosocial stressors in the workplace. Pain and associated disability can be exacerbated by these ergonomic and psychosocial stressors. The application of ergonomic principles and techniques in the context of clinical management of UECTDs may assist in efforts to return the injured worker to work and reduce the likelihood of increased symptoms, discomfort, and disability. This paper presents a case of a 43-year-old dental hygientist unable to work for a period of 2 months due to recurrent episodes of pain in the neck, right shoulder, and arm radiating to the right thumb experienced episodically over a 10-year duration. The case is presented to illustrate the application of ergonomic principles and techniques in the clinical management of a chronic episodic UECTD. The implementation of an ergonomic job analysis and subsequent ergonomic interventions at the workplace that occurred in conjunction with rehabilitation was associated with anecdotal improvements in pain, function, and comfort levels upon returning to work. While the case highlights the potential utility of ergonomics in the management of an occupational musculoskeletal upper extremity disorder, the need for reliable, valid, cost effective, and time efficient methods to assess ergonomic exposure within a clinical context remain to be developed.
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Affiliation(s)
- P F Hickey
- Center for Occupational Rehabilitation, University of Rochester Medical Center, 2337 Clinton Avenue South, 14618, Rochester, New York
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Hickey PF. Isokinetic strength testing in monitoring progress in a multidisciplinary work reentry program: A case study. J Occup Rehabil 1991; 1:83-90. [PMID: 24242328 DOI: 10.1007/bf01073282] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The purpose of this paper is to present a case study of a patient with a history of low back pain and the use of isokinetic testing in tracking that patient through a work-reentry program. A 44-year-old male with a diagnosis of low back pain underwent a functional capacity evaluation and began a work-reentry program. Initial isokinetic testing revealed low torque outputs in both the trunk and knee flexion and extension tests as well as limited active range of motion. Coefficient of variation appeared to be relatively high and the patient seemed guarded in his movements during the testing. Psychological testing revealed a high fear of reinjury which may have influenced the initial test. Subsequent isokinetic testing performed on the tenth and twenty-fourth days of program and at 1 month post-program exhibited greater than expected increases in torque output. This could be due in part to a reduction in the fear of reinjury, a learning effect with repeated exposure to testing, and the patient's increased confidence in the use of unguarded movements. His trunk range of motion remained essentially the same throughout the serial testing. Pain in the back and left leg was slightly diminished despite an increase in strength and function.
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Affiliation(s)
- P F Hickey
- Center for Occupational Rehabilitation, University of Rochester, 2337 S. Clinton Avenue, 14618, Rochester, New York
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Hickey PF. Letters to the editor. Innovate or perish. Bull Dayton Dent Soc 1969; 20:16 passim. [PMID: 5267263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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