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Key J, Gispert S, Auburger G. Knockout Mouse Studies Show That Mitochondrial CLPP Peptidase and CLPX Unfoldase Act in Matrix Condensates near IMM, as Fast Stress Response in Protein Assemblies for Transcript Processing, Translation, and Heme Production. Genes (Basel) 2024; 15:694. [PMID: 38927630 PMCID: PMC11202940 DOI: 10.3390/genes15060694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 05/23/2024] [Accepted: 05/24/2024] [Indexed: 06/28/2024] Open
Abstract
LONP1 is the principal AAA+ unfoldase and bulk protease in the mitochondrial matrix, so its deletion causes embryonic lethality. The AAA+ unfoldase CLPX and the peptidase CLPP also act in the matrix, especially during stress periods, but their substrates are poorly defined. Mammalian CLPP deletion triggers infertility, deafness, growth retardation, and cGAS-STING-activated cytosolic innate immunity. CLPX mutations impair heme biosynthesis and heavy metal homeostasis. CLPP and CLPX are conserved from bacteria to humans, despite their secondary role in proteolysis. Based on recent proteomic-metabolomic evidence from knockout mice and patient cells, we propose that CLPP acts on phase-separated ribonucleoprotein granules and CLPX on multi-enzyme condensates as first-aid systems near the inner mitochondrial membrane. Trimming within assemblies, CLPP rescues stalled processes in mitoribosomes, mitochondrial RNA granules and nucleoids, and the D-foci-mediated degradation of toxic double-stranded mtRNA/mtDNA. Unfolding multi-enzyme condensates, CLPX maximizes PLP-dependent delta-transamination and rescues malformed nascent peptides. Overall, their actions occur in granules with multivalent or hydrophobic interactions, separated from the aqueous phase. Thus, the role of CLPXP in the matrix is compartment-selective, as other mitochondrial peptidases: MPPs at precursor import pores, m-AAA and i-AAA at either IMM face, PARL within the IMM, and OMA1/HTRA2 in the intermembrane space.
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Affiliation(s)
| | | | - Georg Auburger
- Experimental Neurology, Clinic of Neurology, University Hospital, Goethe University Frankfurt, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (J.K.); (S.G.)
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Evans EP, Helbing CC. Defining components of early thyroid hormone signalling through temperature-mediated activation of molecular memory in cultured Rana [lithobates] catesbeiana tadpole back skin. Gen Comp Endocrinol 2024; 347:114440. [PMID: 38159870 DOI: 10.1016/j.ygcen.2023.114440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 12/19/2023] [Accepted: 12/24/2023] [Indexed: 01/03/2024]
Abstract
Thyroid hormones (THs) are essential signalling molecules for the postembryonic development of all vertebrates. THs are necessary for the metamorphosis from tadpole to froglet and exogenous TH administration precociously induces metamorphosis. In American bullfrog (Rana [Lithobates] catesbeiana) tadpoles, the TH-induced metamorphosis observed at a warm temperature (24 °C) is arrested at a cold temperature (4 °C) even in the presence of exogenous THs. However, when TH-exposed tadpoles are shifted from cold to warm temperatures (4 → 24 °C), they undergo TH-dependent metamorphosis at an accelerated rate even when the initial TH signal is no longer present. Thus, they possess a "molecular memory" of TH exposure that establishes the TH-induced response program at the cold temperature and prompts accelerated metamorphosis after a shift to a warmer temperature. The components of the molecular memory that allow the uncoupling of initiation from the execution of the metamorphic program are not understood. To investigate this, we used cultured tadpole back skin (C-Skin) in a repeated measures experiment under 24 °C only, 4 °C only, and 4 → 24 °C temperature shifted regimes and reverse transcription quantitative polymerase chain reaction (RT-qPCR) and RNA-sequencing (RNA-seq) analyses. RNA-seq identified 570, 44, and 890 transcripts, respectively, that were significantly changed by TH treatment. These included transcripts encoding transcription factors and proteins involved in mRNA structure and stability. Notably, transcripts associated with molecular memory do not overlap with those identified previously in cultured tail fin (C-fin) except for TH-induced basic leucine zipper-containing protein (thibz) suggesting that thibz may have a central role in molecular memory that works with tissue-specific factors to establish TH-induced gene expression programs.
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Affiliation(s)
- E P Evans
- Department of Biochemistry and Microbiology, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada
| | - C C Helbing
- Department of Biochemistry and Microbiology, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada.
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Key J, Gispert S, Koepf G, Steinhoff-Wagner J, Reichlmeir M, Auburger G. Translation Fidelity and Respiration Deficits in CLPP-Deficient Tissues: Mechanistic Insights from Mitochondrial Complexome Profiling. Int J Mol Sci 2023; 24:17503. [PMID: 38139332 PMCID: PMC10743472 DOI: 10.3390/ijms242417503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/07/2023] [Accepted: 12/08/2023] [Indexed: 12/24/2023] Open
Abstract
The mitochondrial matrix peptidase CLPP is crucial during cell stress. Its loss causes Perrault syndrome type 3 (PRLTS3) with infertility, neurodegeneration, and a growth deficit. Its target proteins are disaggregated by CLPX, which also regulates heme biosynthesis via unfolding ALAS enzymes, providing access for pyridoxal-5'-phosphate (PLP). Despite efforts in diverse organisms with multiple techniques, CLPXP substrates remain controversial. Here, avoiding recombinant overexpression, we employed complexomics in mitochondria from three mouse tissues to identify endogenous targets. A CLPP absence caused the accumulation and dispersion of CLPX-VWA8 as AAA+ unfoldases, and of PLPBP. Similar changes and CLPX-VWA8 co-migration were evident for mitoribosomal central protuberance clusters, translation factors like GFM1-HARS2, the RNA granule components LRPPRC-SLIRP, and enzymes OAT-ALDH18A1. Mitochondrially translated proteins in testes showed reductions to <30% for MTCO1-3, the mis-assembly of the complex IV supercomplex, and accumulated metal-binding assembly factors COX15-SFXN4. Indeed, heavy metal levels were increased for iron, molybdenum, cobalt, and manganese. RT-qPCR showed compensatory downregulation only for Clpx mRNA; most accumulated proteins appeared transcriptionally upregulated. Immunoblots validated VWA8, MRPL38, MRPL18, GFM1, and OAT accumulation. Co-immunoprecipitation confirmed CLPX binding to MRPL38, GFM1, and OAT, so excess CLPX and PLP may affect their activity. Our data mechanistically elucidate the mitochondrial translation fidelity deficits which underlie progressive hearing impairment in PRLTS3.
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Affiliation(s)
- Jana Key
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Exp. Neurology, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (S.G.); (M.R.); (G.A.)
| | - Suzana Gispert
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Exp. Neurology, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (S.G.); (M.R.); (G.A.)
| | - Gabriele Koepf
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Exp. Neurology, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (S.G.); (M.R.); (G.A.)
| | - Julia Steinhoff-Wagner
- TUM School of Life Sciences, Animal Nutrition and Metabolism, Technical University of Munich, Liesel-Beckmann-Str. 2, 85354 Freising-Weihenstephan, Germany;
| | - Marina Reichlmeir
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Exp. Neurology, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (S.G.); (M.R.); (G.A.)
| | - Georg Auburger
- Goethe University Frankfurt, University Hospital, Clinic of Neurology, Exp. Neurology, Heinrich Hoffmann Str. 7, 60590 Frankfurt am Main, Germany; (S.G.); (M.R.); (G.A.)
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Qu JH, Tarasov KV, Chakir K, Tarasova YS, Riordon DR, Lakatta EG. Proteomic Landscape and Deduced Functions of the Cardiac 14-3-3 Protein Interactome. Cells 2022; 11:cells11213496. [PMID: 36359893 PMCID: PMC9654263 DOI: 10.3390/cells11213496] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 10/17/2022] [Accepted: 10/24/2022] [Indexed: 11/09/2022] Open
Abstract
Rationale: The 14-3-3 protein family is known to interact with many proteins in non-cardiac cell types to regulate multiple signaling pathways, particularly those relating to energy and protein homeostasis; and the 14-3-3 network is a therapeutic target of critical metabolic and proteostatic signaling in cancer and neurological diseases. Although the heart is critically sensitive to nutrient and energy alterations, and multiple signaling pathways coordinate to maintain the cardiac cell homeostasis, neither the structure of cardiac 14-3-3 protein interactome, nor potential functional roles of 14-3-3 protein–protein interactions (PPIs) in heart has been explored. Objective: To establish the comprehensive landscape and characterize the functional role of cardiac 14-3-3 PPIs. Methods and Results: We evaluated both RNA expression and protein abundance of 14-3-3 isoforms in mouse heart, followed by co-immunoprecipitation of 14-3-3 proteins and mass spectrometry in left ventricle. We identified 52 proteins comprising the cardiac 14-3-3 interactome. Multiple bioinformatic analyses indicated that more than half of the proteins bound to 14-3-3 are related to mitochondria; and the deduced functions of the mitochondrial 14-3-3 network are to regulate cardiac ATP production via interactions with mitochondrial inner membrane proteins, especially those in mitochondrial complex I. Binding to ribosomal proteins, 14-3-3 proteins likely coordinate protein synthesis and protein quality control. Localizations of 14-3-3 proteins to mitochondria and ribosome were validated via immunofluorescence assays. The deduced function of cardiac 14-3-3 PPIs is to regulate cardiac metabolic homeostasis and proteostasis. Conclusions: Thus, the cardiac 14-3-3 interactome may be a potential therapeutic target in cardiovascular metabolic and proteostatic disease states, as it already is in cancer therapy.
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Patasova K, Haarman AEG, Musolf AM, Mahroo OA, Rahi JS, Falchi M, Verhoeven VJM, Bailey-Wilson JE, Klaver CCW, Duggal P, Klein A, Guggenheim JA, Hammond CJ, Hysi PG. Association analyses of rare variants identify two genes associated with refractive error. PLoS One 2022; 17:e0272379. [PMID: 36137074 PMCID: PMC9499304 DOI: 10.1371/journal.pone.0272379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 07/18/2022] [Indexed: 11/19/2022] Open
Abstract
PURPOSE Genetic variants identified through population-based genome-wide studies are generally of high frequency, exerting their action in the central part of the refractive error spectrum. However, the power to identify associations with variants of lower minor allele frequency is greatly reduced, requiring considerable sample sizes. Here we aim to assess the impact of rare variants on genetic variation of refractive errors in a very large general population cohort. METHODS Genetic association analyses of non-cyclopaedic autorefraction calculated as mean spherical equivalent (SPHE) used whole-exome sequence genotypic information from 50,893 unrelated participants in the UK Biobank of European ancestry. Gene-based analyses tested for association with SPHE using an optimised SNP-set kernel association test (SKAT-O) restricted to rare variants (minor allele frequency < 1%) within protein-coding regions of the genome. All models were adjusted for age, sex and common lead variants within the same locus reported by previous genome-wide association studies. Potentially causal markers driving association at significant loci were elucidated using sensitivity analyses by sequentially dropping the most associated variants from gene-based analyses. RESULTS We found strong statistical evidence for association of SPHE with the SIX6 (p-value = 2.15 x 10-10, or Bonferroni-Corrected p = 4.41x10-06) and the CRX gene (p-value = 6.65 x 10-08, or Bonferroni-Corrected p = 0.001). The SIX6 gene codes for a transcription factor believed to be critical to the eye, retina and optic disc development and morphology, while CRX regulates photoreceptor specification and expression of over 700 genes in the retina. These novel associations suggest an important role of genes involved in eye morphogenesis in refractive error. CONCLUSION The results of our study support previous research highlighting the importance of rare variants to the genetic risk of refractive error. We explain some of the origins of the genetic signals seen in GWAS but also report for the first time a completely novel association with the CRX gene.
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Affiliation(s)
- Karina Patasova
- Department of Ophthalmology, King’s College London, London, United Kingdom
- Department of Twins Research and Genetic Epidemiology, King’s College London, London, United Kingdom
| | - Annechien E. G. Haarman
- Department of Ophthalmology, Erasmus Medical Center, Rotterdam, The Netherlands
- Department of Epidemiology, Erasmus MC, Rotterdam, The Netherlands
| | - Anthony M. Musolf
- Computational and Statistical Genomics Branch, National Human Genome Research Institute, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Omar A. Mahroo
- Department of Ophthalmology, King’s College London, London, United Kingdom
- Department of Twins Research and Genetic Epidemiology, King’s College London, London, United Kingdom
- NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and the UCL Institute of Ophthalmology, London, United Kingdom
- Department of Ophthalmology, St Thomas’ Hospital, Guys and St ’Thomas’ NHS Foundation Trust, London, United Kingdom
- Institute of Ophthalmology, University College London, London, United Kingdom
| | - Jugnoo S. Rahi
- UCL Great Ormond Street Hospital Institute of Child Health, London, United Kingdom
- Ulverscroft Vision Research Group, University College London, London, United Kingdom
| | - Mario Falchi
- Department of Twins Research and Genetic Epidemiology, King’s College London, London, United Kingdom
| | - Virginie J. M. Verhoeven
- Department of Ophthalmology, Erasmus Medical Center, Rotterdam, The Netherlands
- Department of Epidemiology, Erasmus MC, Rotterdam, The Netherlands
| | - Joan E. Bailey-Wilson
- Computational and Statistical Genomics Branch, National Human Genome Research Institute, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Caroline C. W. Klaver
- Department of Ophthalmology, Erasmus Medical Center, Rotterdam, The Netherlands
- Department of Epidemiology, Erasmus MC, Rotterdam, The Netherlands
- Department of Ophthalmology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Priya Duggal
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States of America
| | - Alison Klein
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States of America
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Johns Hopkins University, Baltimore, Maryland, United States of America
- Department of Pathology, Johns Hopkins School of Medicine, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Jeremy A. Guggenheim
- School of Optometry & Vision Sciences, Cardiff University, Cardiff, United Kingdom
| | - Chris J. Hammond
- Department of Ophthalmology, King’s College London, London, United Kingdom
- Department of Twins Research and Genetic Epidemiology, King’s College London, London, United Kingdom
| | - Pirro G. Hysi
- Department of Ophthalmology, King’s College London, London, United Kingdom
- Department of Twins Research and Genetic Epidemiology, King’s College London, London, United Kingdom
- UCL Great Ormond Street Hospital Institute of Child Health, London, United Kingdom
- * E-mail:
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Inactivity of Peptidase ClpP Causes Primary Accumulation of Mitochondrial Disaggregase ClpX with Its Interacting Nucleoid Proteins, and of mtDNA. Cells 2021; 10:cells10123354. [PMID: 34943861 PMCID: PMC8699119 DOI: 10.3390/cells10123354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/20/2021] [Accepted: 11/25/2021] [Indexed: 12/19/2022] Open
Abstract
Biallelic pathogenic variants in CLPP, encoding mitochondrial matrix peptidase ClpP, cause a rare autosomal recessive condition, Perrault syndrome type 3 (PRLTS3). It is characterized by primary ovarian insufficiency and early sensorineural hearing loss, often associated with progressive neurological deficits. Mouse models showed that accumulations of (i) its main protein interactor, the substrate-selecting AAA+ ATPase ClpX, (ii) mitoribosomes, and (iii) mtDNA nucleoids are the main cellular consequences of ClpP absence. However, the sequence of these events and their validity in human remain unclear. Here, we studied global proteome profiles to define ClpP substrates among mitochondrial ClpX interactors, which accumulated consistently in ClpP-null mouse embryonal fibroblasts and brains. Validation work included novel ClpP-mutant patient fibroblast proteomics. ClpX co-accumulated in mitochondria with the nucleoid component POLDIP2, the mitochondrial poly(A) mRNA granule element LRPPRC, and tRNA processing factor GFM1 (in mouse, also GRSF1). Only in mouse did accumulated ClpX, GFM1, and GRSF1 appear in nuclear fractions. Mitoribosomal accumulation was minor. Consistent accumulations in murine and human fibroblasts also affected multimerizing factors not known as ClpX interactors, namely, OAT, ASS1, ACADVL, STOM, PRDX3, PC, MUT, ALDH2, PMPCB, UQCRC2, and ACADSB, but the impact on downstream metabolites was marginal. Our data demonstrate the primary impact of ClpXP on the assembly of proteins with nucleic acids and show nucleoid enlargement in human as a key consequence.
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Luo M, Ma W, Zapata-Bustos R, Willis WT, Mandarino LJ. Deletion of Von Willebrand A Domain Containing Protein (VWA8) raises activity of mitochondrial electron transport chain complexes in hepatocytes. Biochem Biophys Rep 2021; 26:100928. [PMID: 33665377 PMCID: PMC7900673 DOI: 10.1016/j.bbrep.2021.100928] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 01/19/2021] [Accepted: 01/19/2021] [Indexed: 11/27/2022] Open
Abstract
VWA8 (Von Willebrand A Domain Containing Protein 8) is a AAA+ ATPase that is localized to the mitochondrial matrix and is widely expressed in highly energetic tissues. Originally found to be higher in abundance in livers of mice fed a high fat diet, deletion of the VWA8 gene in differentiated mouse AML12 hepatocytes unexpectedly produced a phenotype of higher mitochondrial and nonmitochondrial oxidative metabolism, higher ROS (reactive oxygen species) production mainly from NADPH oxidases, and increased HNF4a expression. The purposes of this study were first, to determine whether higher mitochondrial oxidative capacity in VWA8 null hepatocytes is the product of higher capacity in all aspects of the electron transport chain and oxidative phosphorylation, and second, the density of cristae in mitochondria and mitochondrial content was measured to determine if higher mitochondrial oxidative capacity is accompanied by greater cristae area and mitochondrial abundance. Electron transport chain complexes I, II, III, and IV activities all were higher in hepatocytes in which the VWA8 gene had been deleted using CRISPR/Cas9. A comparison of abundance of proteins in electron transport chain complexes I, III and ATP synthase previously determined using an unbiased proteomics approach in hepatocytes in which VWA8 had been deleted showed agreement with the activity assays. Mitochondrial cristae, the site where electron transport chain complexes are located, were quantified using electron microscopy and stereology. Cristae density, per mitochondrial area, was almost two-fold higher in the VWA8 null cells (P < 0.01), and mitochondrial area was two-fold higher in the VWA8 null cells (P < 0.05). The results of this study allow us to conclude that despite sustained, higher ROS production in VWA8 null cells, a global mitochondrial compensatory response was maintained, resulting in overall higher mitochondrial oxidative capacity.
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Key Words
- ADP, adenine dinucleotide phosphate
- ANT, adenine nucleotide translocase
- ATP, adenine trinucleotide phosphate
- ETC, electron transport chain
- Electron transport chain
- HNF4, hepatocyte nuclear factor 4
- Hepatocytes
- Mitochondria
- NADPH, nicotinamide adenine dinucleotide phosphate
- OCR, oxygen consumption rate
- PFO, perfringolysin
- ROS, reactive oxygen species
- TMHQ, Tetramethylhydroquinone
- TMPD, N,N,N′,N'-Tetramethyl-p-phenylenediamine
- VWA8
- VWA8, Von Willebrand Domain-containing Protein 8
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Affiliation(s)
- Moulun Luo
- Department of Medicine, Division of Endocrinology, USA
| | - Wuqiong Ma
- Department of Medicine, Division of Endocrinology, USA
| | | | - Wayne T. Willis
- Department of Medicine, Division of Endocrinology, USA
- Center for Disparities in Diabetes, Obesity, and Metabolism, The University of Arizona, Tucson, AZ, 85724, USA
| | - Lawrence J. Mandarino
- Department of Medicine, Division of Endocrinology, USA
- Center for Disparities in Diabetes, Obesity, and Metabolism, The University of Arizona, Tucson, AZ, 85724, USA
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Root L, Campo A, MacNiven L, Con P, Cnaani A, Kültz D. A data-independent acquisition (DIA) assay library for quantitation of environmental effects on the kidney proteome of Oreochromis niloticus. Mol Ecol Resour 2021; 21:2486-2503. [PMID: 34101993 DOI: 10.1111/1755-0998.13445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 04/30/2021] [Accepted: 06/01/2021] [Indexed: 12/31/2022]
Abstract
Interactions of organisms with their environment are complex and environmental regulation at different levels of biological organization is often nonlinear. Therefore, the genotype to phenotype continuum requires study at multiple levels of organization. While studies of transcriptome regulation are now common for many species, quantitative studies of environmental effects on proteomes are needed. Here we report the generation of a data-independent acquisition (DIA) assay library that enables simultaneous targeted proteomics of thousands of Oreochromis niloticus kidney proteins using a label- and gel-free workflow that is well suited for ecologically relevant field samples. We demonstrate the usefulness of this DIA assay library by discerning environmental effects on the kidney proteome of O. niloticus. Moreover, we demonstrate that the DIA assay library approach generates data that are complimentary rather than redundant to transcriptomic data. Transcript and protein abundance differences in kidneys of tilapia acclimated to freshwater and brackish water (25 g/kg) were correlated for 2114 unique genes. A high degree of non-linearity in salinity-dependent regulation of transcriptomes and proteomes was revealed suggesting that the regulation of O. niloticus renal function by environmental salinity relies heavily on post-transcriptional mechanisms. The application of functional enrichment analyses using STRING and KEGG to DIA assay data sets is demonstrated by identifying myo-inositol metabolism, antioxidant and xenobiotic functions, and signalling mechanisms as key elements controlled by salinity in tilapia kidneys. The DIA assay library resource presented here can be adopted for other tissues and other organisms to study proteome dynamics during changing ecological contexts.
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Affiliation(s)
- Larken Root
- Department of Animal Sciences, University of California Davis, Davis, CA, USA
| | - Aurora Campo
- Department of Poultry and Aquaculture, Institute of Animal Sciences, Agricultural Research Organization, Volcani Center, Rishon LeZion, Israel
| | - Leah MacNiven
- Department of Animal Sciences, University of California Davis, Davis, CA, USA
| | - Pazit Con
- Department of Poultry and Aquaculture, Institute of Animal Sciences, Agricultural Research Organization, Volcani Center, Rishon LeZion, Israel
| | - Avner Cnaani
- Department of Poultry and Aquaculture, Institute of Animal Sciences, Agricultural Research Organization, Volcani Center, Rishon LeZion, Israel
| | - Dietmar Kültz
- Department of Animal Sciences, University of California Davis, Davis, CA, USA
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Iparraguirre L, Olaverri D, Blasco T, Sepúlveda L, Castillo-Triviño T, Espiño M, Costa-Frossard L, Prada Á, Villar LM, Otaegui D, Muñoz-Culla M. Whole-Transcriptome Analysis in Peripheral Blood Mononuclear Cells from Patients with Lipid-Specific Oligoclonal IgM Band Characterization Reveals Two Circular RNAs and Two Linear RNAs as Biomarkers of Highly Active Disease. Biomedicines 2020; 8:E540. [PMID: 33255923 PMCID: PMC7759842 DOI: 10.3390/biomedicines8120540] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 11/21/2020] [Accepted: 11/23/2020] [Indexed: 12/14/2022] Open
Abstract
The presence of anti-myelin lipid-specific oligoclonal IgM bands (LS-OCMBs) has been defined as an accurate predictor of an aggressive evolution of multiple sclerosis. However, the detection of this biomarker is performed in cerebrospinal fluid, a quite invasive liquid biopsy. In the present study we aimed at studying the expression profile of miRNA, snoRNA, circRNA and linearRNA in peripheral blood mononuclear cells (PBMCs) from patients with lipid-specific oligoclonal IgM band characterization. We included a total of 89 MS patients, 47 with negative LS-OCMB status and 42 with positive status. Microarray (miRNA and snoRNA) and RNA-seq (circular and linear RNAs) were used to perform the profiling study in the discovery cohort and candidates were validated by RT-qPCR in the whole cohort. The biomarker potential of the candidates was evaluated by ROC curve analysis. RNA-seq and RT-qPCR validation revealed that two circular (hsa_circ_0000478 and hsa_circ_0116639) and two linear RNAs (IRF5 and MTRNR2L8) are downregulated in PBMCs from patients with positive LS-OCMBs. Finally, those RNAs show a performance of a 70% accuracy in some of the combinations. The expression of hsa_circ_0000478, hsa_circ_0116639, IRF5 and MTRNR2L8 might serve as minimally invasive biomarkers of highly active disease.
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Affiliation(s)
- Leire Iparraguirre
- Multiple Sclerosis Group, Neurosciences Area, Biodonostia Health Research Institute, 20014 San Sebastian, Spain; (L.I.); (D.O.); (T.B.); (L.S.); (D.O.)
| | - Danel Olaverri
- Multiple Sclerosis Group, Neurosciences Area, Biodonostia Health Research Institute, 20014 San Sebastian, Spain; (L.I.); (D.O.); (T.B.); (L.S.); (D.O.)
- Department of Biomedical Engineering and Sciences, Tecnun-Universidad de Navarra, Manuel de Lardizábal 15, 20018 San Sebastián, Spain
| | - Telmo Blasco
- Multiple Sclerosis Group, Neurosciences Area, Biodonostia Health Research Institute, 20014 San Sebastian, Spain; (L.I.); (D.O.); (T.B.); (L.S.); (D.O.)
- Department of Biomedical Engineering and Sciences, Tecnun-Universidad de Navarra, Manuel de Lardizábal 15, 20018 San Sebastián, Spain
| | - Lucía Sepúlveda
- Multiple Sclerosis Group, Neurosciences Area, Biodonostia Health Research Institute, 20014 San Sebastian, Spain; (L.I.); (D.O.); (T.B.); (L.S.); (D.O.)
- Spanish Network of Multiple Sclerosis, 08028 Barcelona, Spain;
| | - Tamara Castillo-Triviño
- Multiple Sclerosis Group, Neurosciences Area, Biodonostia Health Research Institute, Neurology Department, Basque Health Service, 20014 San Sebastian, Spain;
| | - Mercedes Espiño
- Departments of Immunology and Neurology, Multiple Sclerosis Unit, Hospital Ramon y Cajal, (IRYCIS), 28034 Madrid, Spain; (M.E.); (L.C.-F.)
| | - Lucienne Costa-Frossard
- Departments of Immunology and Neurology, Multiple Sclerosis Unit, Hospital Ramon y Cajal, (IRYCIS), 28034 Madrid, Spain; (M.E.); (L.C.-F.)
| | - Álvaro Prada
- Multiple Sclerosis Group, Neurosciences Area, Biodonostia Health Research Institute, Immunology Department, Basque Health Service, 20014 San Sebastian, Spain;
| | - Luisa María Villar
- Spanish Network of Multiple Sclerosis, 08028 Barcelona, Spain;
- Departments of Immunology and Neurology, Multiple Sclerosis Unit, Hospital Ramon y Cajal, (IRYCIS), 28034 Madrid, Spain; (M.E.); (L.C.-F.)
| | - David Otaegui
- Multiple Sclerosis Group, Neurosciences Area, Biodonostia Health Research Institute, 20014 San Sebastian, Spain; (L.I.); (D.O.); (T.B.); (L.S.); (D.O.)
- Spanish Network of Multiple Sclerosis, 08028 Barcelona, Spain;
| | - Maider Muñoz-Culla
- Multiple Sclerosis Group, Neurosciences Area, Biodonostia Health Research Institute, 20014 San Sebastian, Spain; (L.I.); (D.O.); (T.B.); (L.S.); (D.O.)
- Spanish Network of Multiple Sclerosis, 08028 Barcelona, Spain;
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Zhu M, Chisholm AD, Jin Y. C. elegans VWA-8 is a mitochondrial protein. MICROPUBLICATION BIOLOGY 2020; 2020. [PMID: 32656508 PMCID: PMC7297598 DOI: 10.17912/micropub.biology.000264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ming Zhu
- Section of Neurobiology, University of California San Diego, La Jolla, CA 92093, United States
| | - Andrew D Chisholm
- Section of Neurobiology, University of California San Diego, La Jolla, CA 92093, United States
| | - Yishi Jin
- Section of Neurobiology, University of California San Diego, La Jolla, CA 92093, United States
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Imanaka T, Kawaguchi K. A novel dynein-type AAA+ protein with peroxisomal targeting signal type 2. J Biochem 2020; 167:429-432. [PMID: 32027355 DOI: 10.1093/jb/mvaa018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 01/28/2020] [Indexed: 11/14/2022] Open
Abstract
Peroxisomal matrix proteins are imported into peroxisomes in a process mediated by peroxisomal targeting signal (PTS) type 1 and 2. The PTS2 proteins are imported into peroxisomes after binding with Pex7p. Niwa et al. (A newly isolated Pex7-binding, atypical PTS2 protein P7BP2 is a novel dynein-type AAA+ protein. J Biochem 2018;164:437-447) identified a novel Pex7p-binding protein in CHO cells and characterized the subcellular distribution and molecular properties of the human homologue, 'P7BP2'. Interestingly, P7BP2 possesses PTS2 at the NH2 terminal and six putative AAA+ domains. Another group has suggested that the protein also possesses mitochondrial targeting signal at the NH2 terminal. In fact, the P7BP2 expressed in mammalian cells is targeted to both peroxisomes and mitochondria. The purified protein from Sf9 cells is a monomer and has a disc-like ring structure, suggesting that P7BP2 is a novel dynein-type AAA+ family protein. The protein expressed in insect cells exhibits ATPase activity. P7BP2 localizes to peroxisomes and mitochondria, and has a common function related to dynein-type ATPases in both organelles.
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Affiliation(s)
- Tsuneo Imanaka
- Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hirokoshinkai, Kure, Hiroshima 737-0112, Japan
| | - Kosuke Kawaguchi
- Department of Molecular Cell Biology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan
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