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Pierson E, De Pol F, Fillet M, Wouters J. A morpheein equilibrium regulates catalysis in phosphoserine phosphatase SerB2 from Mycobacterium tuberculosis. Commun Biol 2023; 6:1024. [PMID: 37817000 PMCID: PMC10564941 DOI: 10.1038/s42003-023-05402-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 09/29/2023] [Indexed: 10/12/2023] Open
Abstract
Mycobacterium tuberculosis phosphoserine phosphatase MtSerB2 is of interest as a new antituberculosis target due to its essential metabolic role in L-serine biosynthesis and effector functions in infected cells. Previous works indicated that MtSerB2 is regulated through an oligomeric transition induced by L-Ser that could serve as a basis for the design of selective allosteric inhibitors. However, the mechanism underlying this transition remains highly elusive due to the lack of experimental structural data. Here we describe a structural, biophysical, and enzymological characterisation of MtSerB2 oligomerisation in the presence and absence of L-Ser. We show that MtSerB2 coexists in dimeric, trimeric, and tetrameric forms of different activity levels interconverting through a conformationally flexible monomeric state, which is not observed in two near-identical mycobacterial orthologs. This morpheein behaviour exhibited by MtSerB2 lays the foundation for future allosteric drug discovery and provides a starting point to the understanding of its peculiar multifunctional moonlighting properties.
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Affiliation(s)
- Elise Pierson
- Laboratoire de Chimie Biologique Structurale (CBS), Namur Research Institute for Life Sciences (NARILIS), University of Namur (UNamur), 5000, Namur, Belgium
| | - Florian De Pol
- Laboratoire de Chimie Biologique Structurale (CBS), Namur Research Institute for Life Sciences (NARILIS), University of Namur (UNamur), 5000, Namur, Belgium
| | - Marianne Fillet
- Laboratory for the Analysis of Medicines (LAM), Center for Interdisciplinary Research on Medicines (CIRM), University of Liège (ULiège), 4000, Liège, Belgium
| | - Johan Wouters
- Laboratoire de Chimie Biologique Structurale (CBS), Namur Research Institute for Life Sciences (NARILIS), University of Namur (UNamur), 5000, Namur, Belgium.
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Vanheer L, Fantuzzi F, To SK, Schiavo A, Van Haele M, Ostyn T, Haesen T, Yi X, Janiszewski A, Chappell J, Rihoux A, Sawatani T, Roskams T, Pattou F, Kerr-Conte J, Cnop M, Pasque V. Inferring regulators of cell identity in the human adult pancreas. NAR Genom Bioinform 2023; 5:lqad068. [PMID: 37435358 PMCID: PMC10331937 DOI: 10.1093/nargab/lqad068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 06/17/2023] [Accepted: 06/28/2023] [Indexed: 07/13/2023] Open
Abstract
Cellular identity during development is under the control of transcription factors that form gene regulatory networks. However, the transcription factors and gene regulatory networks underlying cellular identity in the human adult pancreas remain largely unexplored. Here, we integrate multiple single-cell RNA-sequencing datasets of the human adult pancreas, totaling 7393 cells, and comprehensively reconstruct gene regulatory networks. We show that a network of 142 transcription factors forms distinct regulatory modules that characterize pancreatic cell types. We present evidence that our approach identifies regulators of cell identity and cell states in the human adult pancreas. We predict that HEYL, BHLHE41 and JUND are active in acinar, beta and alpha cells, respectively, and show that these proteins are present in the human adult pancreas as well as in human induced pluripotent stem cell (hiPSC)-derived islet cells. Using single-cell transcriptomics, we found that JUND represses beta cell genes in hiPSC-alpha cells. BHLHE41 depletion induced apoptosis in primary pancreatic islets. The comprehensive gene regulatory network atlas can be explored interactively online. We anticipate our analysis to be the starting point for a more sophisticated dissection of how transcription factors regulate cell identity and cell states in the human adult pancreas.
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Affiliation(s)
| | | | - San Kit To
- Department of Development and Regeneration; KU Leuven - University of Leuven; Single-cell Omics Institute and Leuven Stem Cell Institute, Herestraat 49, B-3000 Leuven, Belgium
| | - Andrea Schiavo
- ULB Center for Diabetes Research; Université Libre de Bruxelles; Route de Lennik 808, B-1070 Brussels, Belgium
| | - Matthias Van Haele
- Department of Imaging and Pathology; Translational Cell and Tissue Research, KU Leuven and University Hospitals Leuven; Herestraat 49, B-3000 Leuven, Belgium
| | - Tessa Ostyn
- Department of Imaging and Pathology; Translational Cell and Tissue Research, KU Leuven and University Hospitals Leuven; Herestraat 49, B-3000 Leuven, Belgium
| | - Tine Haesen
- Department of Development and Regeneration; KU Leuven - University of Leuven; Single-cell Omics Institute and Leuven Stem Cell Institute, Herestraat 49, B-3000 Leuven, Belgium
| | - Xiaoyan Yi
- ULB Center for Diabetes Research; Université Libre de Bruxelles; Route de Lennik 808, B-1070 Brussels, Belgium
| | - Adrian Janiszewski
- Department of Development and Regeneration; KU Leuven - University of Leuven; Single-cell Omics Institute and Leuven Stem Cell Institute, Herestraat 49, B-3000 Leuven, Belgium
| | - Joel Chappell
- Department of Development and Regeneration; KU Leuven - University of Leuven; Single-cell Omics Institute and Leuven Stem Cell Institute, Herestraat 49, B-3000 Leuven, Belgium
| | - Adrien Rihoux
- Department of Development and Regeneration; KU Leuven - University of Leuven; Single-cell Omics Institute and Leuven Stem Cell Institute, Herestraat 49, B-3000 Leuven, Belgium
| | - Toshiaki Sawatani
- ULB Center for Diabetes Research; Université Libre de Bruxelles; Route de Lennik 808, B-1070 Brussels, Belgium
| | - Tania Roskams
- Department of Imaging and Pathology; Translational Cell and Tissue Research, KU Leuven and University Hospitals Leuven; Herestraat 49, B-3000 Leuven, Belgium
| | - Francois Pattou
- University of Lille, Inserm, CHU Lille, Institute Pasteur Lille, U1190-EGID, F-59000 Lille, France
- European Genomic Institute for Diabetes, F-59000 Lille, France
- University of Lille, F-59000 Lille, France
| | - Julie Kerr-Conte
- University of Lille, Inserm, CHU Lille, Institute Pasteur Lille, U1190-EGID, F-59000 Lille, France
- European Genomic Institute for Diabetes, F-59000 Lille, France
- University of Lille, F-59000 Lille, France
| | - Miriam Cnop
- Correspondence may also be addressed to Miriam Cnop. Tel: +32 2 555 6305; Fax: +32 2 555 6239;
| | - Vincent Pasque
- To whom correspondence should be addressed. Tel: +32 16 376283; Fax: +32 16 330827;
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3
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Gorgogietas V, Rajaei B, Heeyoung C, Santacreu BJ, Marín-Cañas S, Salpea P, Sawatani T, Musuaya A, Arroyo MN, Moreno-Castro C, Benabdallah K, Demarez C, Toivonen S, Cosentino C, Pachera N, Lytrivi M, Cai Y, Carnel L, Brown C, Urano F, Marchetti P, Gilon P, Eizirik DL, Cnop M, Igoillo-Esteve M. GLP-1R agonists demonstrate potential to treat Wolfram syndrome in human preclinical models. Diabetologia 2023; 66:1306-1321. [PMID: 36995380 PMCID: PMC10244297 DOI: 10.1007/s00125-023-05905-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 02/02/2023] [Indexed: 03/31/2023]
Abstract
AIMS/HYPOTHESIS Wolfram syndrome is a rare autosomal recessive disorder caused by pathogenic variants in the WFS1 gene. It is characterised by insulin-dependent diabetes mellitus, optic nerve atrophy, diabetes insipidus, hearing loss and neurodegeneration. Considering the unmet treatment need for this orphan disease, this study aimed to evaluate the therapeutic potential of glucagon-like peptide 1 receptor (GLP-1R) agonists under wolframin (WFS1) deficiency with a particular focus on human beta cells and neurons. METHODS The effect of the GLP-1R agonists dulaglutide and exenatide was examined in Wfs1 knockout mice and in an array of human preclinical models of Wolfram syndrome, including WFS1-deficient human beta cells, human induced pluripotent stem cell (iPSC)-derived beta-like cells and neurons from control individuals and individuals affected by Wolfram syndrome, and humanised mice. RESULTS Our study shows that the long-lasting GLP-1R agonist dulaglutide reverses impaired glucose tolerance in WFS1-deficient mice, and that exenatide and dulaglutide improve beta cell function and prevent apoptosis in different human WFS1-deficient models including iPSC-derived beta cells from people with Wolfram syndrome. Exenatide improved mitochondrial function, reduced oxidative stress and prevented apoptosis in Wolfram syndrome iPSC-derived neural precursors and cerebellar neurons. CONCLUSIONS/INTERPRETATION Our study provides novel evidence for the beneficial effect of GLP-1R agonists on WFS1-deficient human pancreatic beta cells and neurons, suggesting that these drugs may be considered as a treatment for individuals with Wolfram syndrome.
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Grants
- P30 DK020579 NIDDK NIH HHS
- R01 DK132090 NIDDK NIH HHS
- UL1 TR002345 NCATS NIH HHS
- U01 DK127786 NIDDK NIH HHS
- Pandarome project FWO and F.R.S.-FNRS under the Excellence of Science (EOS) programme
- Welbio-FNRS
- National Institutes of Health (NIH)/NIDDK
- Philanthropic supports from the Silberman Fund, the Ellie White Foundation for the Rare Genetic Disorders, the Snow Foundation, the Unravel Wolfram Syndrome Fund, the Stowe Fund, the Feiock Fund, the Cachia Fund, the Gildenhorn Fund, the Eye Hope Foundation, Ontario Wolfram League, Associazione Gentian - Sindrome di Wolfram Italia, Alianza de Familias Afectadas por el Sindrome Wolfram Spain, Wolfram syndrome UK, and Association Syndrome de Wolfram France.
- the Walloon Region SPW-EER Win2Wal project BetaSource
- National Institutes of Health Human Islet Research Network Consortium on Beta Cell Death & Survival from Pancreatic β-Cell Gene Networks to Therapy [HIRN-CBDS])
- Eye Hope Foundation
- Fonds Erasme for Medical Research
- Alianza de familias afectadas por el síndrome de Wolfram (AFASW)
- Brussels Region Innoviris (Bridge) project DiaType
- Dutch Diabetes Research Foundation (Innovate2CureType1)
- Fonds National de la Recherche Scientifique (FNRS)
- Francophone Foundation for Diabetes Research (FFRD, that is sponsored by the French Diabetes Federation, Abbott, Eli Lilly,Merck Sharp & Dohme and Novo Nordisk)
- NIH/ National Center for Advancing Translational Sciences (NCATS)
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Affiliation(s)
- Vyron Gorgogietas
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Bahareh Rajaei
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Chae Heeyoung
- Institut de Recherche Expérimental et Clinique, Pôle d'Endocrinologie, Diabète et Nutrition, Université Catholique de Louvain, Bruxelles, Belgique
| | - Bruno J Santacreu
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Sandra Marín-Cañas
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Paraskevi Salpea
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Toshiaki Sawatani
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Anyishai Musuaya
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - María N Arroyo
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | | | - Khadija Benabdallah
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Celine Demarez
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Sanna Toivonen
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Cristina Cosentino
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Nathalie Pachera
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Maria Lytrivi
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
- Division of Endocrinology, Erasmus Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Ying Cai
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | | | - Cris Brown
- Department of Medicine, Washington University School of Medicine in St Louis, St Louis, MO, USA
| | - Fumihiko Urano
- Department of Medicine, Washington University School of Medicine in St Louis, St Louis, MO, USA
| | - Piero Marchetti
- Department of Clinical and Experimental Medicine, AOUP Cisanello University Hospital, University of Pisa, Pisa, Italy
| | - Patrick Gilon
- Institut de Recherche Expérimental et Clinique, Pôle d'Endocrinologie, Diabète et Nutrition, Université Catholique de Louvain, Bruxelles, Belgique
| | - Decio L Eizirik
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
| | - Miriam Cnop
- ULB Center for Diabetes Research, Université Libre de Bruxelles, Brussels, Belgium
- Division of Endocrinology, Erasmus Hospital, Université Libre de Bruxelles, Brussels, Belgium
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Alvelos MI, Juan-Mateu J, Colli ML, Turatsinze JV, Eizirik DL. When one becomes many-Alternative splicing in β-cell function and failure. Diabetes Obes Metab 2018; 20 Suppl 2:77-87. [PMID: 30230174 PMCID: PMC6148369 DOI: 10.1111/dom.13388] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/22/2018] [Accepted: 05/30/2018] [Indexed: 12/20/2022]
Abstract
Pancreatic β-cell dysfunction and death are determinant events in type 1 diabetes (T1D), but the molecular mechanisms behind β-cell fate remain poorly understood. Alternative splicing is a post-transcriptional mechanism by which a single gene generates different mRNA and protein isoforms, expanding the transcriptome complexity and enhancing protein diversity. Neuron-specific and certain serine/arginine-rich RNA binding proteins (RBP) are enriched in β-cells, playing crucial roles in the regulation of insulin secretion and β-cell survival. Moreover, alternative exon networks, regulated by inflammation or diabetes susceptibility genes, control key pathways and processes for the correct function and survival of β-cells. The challenge ahead of us is to understand the precise role of alternative splicing regulators and splice variants on β-cell function, dysfunction and death and develop tools to modulate it.
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Affiliation(s)
- Maria Inês Alvelos
- ULB Center for Diabetes Research and Welbio, Medical Faculty, Université Libre de Bruxelles (ULB), Route de Lennik, 808 – CP618, B-1070 Brussels, Belgium
| | - Jonàs Juan-Mateu
- ULB Center for Diabetes Research and Welbio, Medical Faculty, Université Libre de Bruxelles (ULB), Route de Lennik, 808 – CP618, B-1070 Brussels, Belgium
| | - Maikel Luis Colli
- ULB Center for Diabetes Research and Welbio, Medical Faculty, Université Libre de Bruxelles (ULB), Route de Lennik, 808 – CP618, B-1070 Brussels, Belgium
| | - Jean-Valéry Turatsinze
- ULB Center for Diabetes Research and Welbio, Medical Faculty, Université Libre de Bruxelles (ULB), Route de Lennik, 808 – CP618, B-1070 Brussels, Belgium
| | - Décio L. Eizirik
- ULB Center for Diabetes Research and Welbio, Medical Faculty, Université Libre de Bruxelles (ULB), Route de Lennik, 808 – CP618, B-1070 Brussels, Belgium
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