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Piché J, Gosset N, Legault LM, Pacis A, Oneglia A, Caron M, Chetaille P, Barreiro L, Liu D, Qi X, Nattel S, Leclerc S, Breton-Larrivée M, McGraw S, Andelfinger G. Molecular Signature of CAID Syndrome: Noncanonical Roles of SGO1 in Regulation of TGF-β Signaling and Epigenomics. Cell Mol Gastroenterol Hepatol 2018; 7:411-431. [PMID: 30739867 PMCID: PMC6369230 DOI: 10.1016/j.jcmgh.2018.10.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 10/17/2018] [Accepted: 10/17/2018] [Indexed: 01/14/2023]
Abstract
BACKGROUND & AIMS A generalized human pacemaking syndrome, chronic atrial and intestinal dysrhythmia (CAID) (OMIM 616201), is caused by a homozygous SGO1 mutation (K23E), leading to chronic intestinal pseudo-obstruction and arrhythmias. Because CAID patients do not show phenotypes consistent with perturbation of known roles of SGO1, we hypothesized that noncanonical roles of SGO1 drive the clinical manifestations observed. METHODS To identify a molecular signature for CAID syndrome, we achieved unbiased screens in cell lines and gut tissues from CAID patients vs wild-type controls. We performed RNA sequencing along with stable isotope labeling with amino acids in cell culture. In addition, we determined the genome-wide DNA methylation and chromatin accessibility signatures using reduced representative bisulfite sequencing and assay for transposase-accessible chromatin with high-throughput sequencing. Functional studies included patch-clamp, quantitation of transforming growth factor-β (TGF-β) signaling, and immunohistochemistry in CAID patient gut biopsy specimens. RESULTS Proteome and transcriptome studies converge on cell-cycle regulation, cardiac conduction, and smooth muscle regulation as drivers of CAID syndrome. Specifically, the inward rectifier current, an important regulator of cellular function, was disrupted. Immunohistochemistry confirmed overexpression of Budding Uninhibited By Benzimidazoles 1 (BUB1) in patients, implicating the TGF-β pathway in CAID pathogenesis. Canonical TGF-β signaling was up-regulated and uncoupled from noncanonical signaling in CAID patients. Reduced representative bisulfite sequencing and assay for transposase-accessible chromatin with high-throughput sequencing experiments showed significant changes of chromatin states in CAID, pointing to epigenetic regulation as a possible pathologic mechanism. CONCLUSIONS Our findings point to impaired inward rectifier potassium current, dysregulation of canonical TGF-β signaling, and epigenetic regulation as potential drivers of intestinal and cardiac manifestations of CAID syndrome. Transcript profiling and genomics data are as follows: repository URL: https://www.ncbi.nlm.nih.gov/geo; SuperSeries GSE110612 was composed of the following subseries: GSE110309, GSE110576, and GSE110601.
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Affiliation(s)
- Jessica Piché
- Cardiovascular Genetics, Department of Pediatrics, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Natacha Gosset
- Cardiovascular Genetics, Department of Pediatrics, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Lisa-Marie Legault
- Department of Biochemistry and Molecular Medicine, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Alain Pacis
- Department of Genetics, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada,Department of Biochemistry, Université de Montréal, Montréal, Québec, Canada
| | - Andrea Oneglia
- Cardiovascular Genetics, Department of Pediatrics, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Maxime Caron
- Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Philippe Chetaille
- Service of Pediatric Cardiology, Department of Pediatrics, Centre Mère Enfants Soleil, Centre Hospitalier de l’Université de Québec, Québec City, Québec, Canada
| | - Luis Barreiro
- Department of Genetics, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada,Department of Biochemistry, Université de Montréal, Montréal, Québec, Canada,Department of Pediatrics, Université de Montréal, Québec, Canada
| | - Donghai Liu
- Research Center, Montreal Heart Institute, Université de Montréal, Montréal, Québec, Canada
| | - Xioyan Qi
- Research Center, Montreal Heart Institute, Université de Montréal, Montréal, Québec, Canada
| | - Stanley Nattel
- Research Center, Montreal Heart Institute, Université de Montréal, Montréal, Québec, Canada
| | - Séverine Leclerc
- Cardiovascular Genetics, Department of Pediatrics, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Mélanie Breton-Larrivée
- Department of Biochemistry and Molecular Medicine, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | | | - Serge McGraw
- Department of Biochemistry and Molecular Medicine, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada,Departement of Obstetrics and Gynecology, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada
| | - Gregor Andelfinger
- Cardiovascular Genetics, Department of Pediatrics, Centre Hospitalier Universitaire Sainte Justine Research Center, Université de Montréal, Montréal, Québec, Canada,Correspondence Address correspondence to: Gregor Andelfinger, MD, FRCPC, Service of Cardiology, Department of Pediatrics, Cardiovascular Genetics Research Laboratory, Centre Hospitalier Sainte Justine Research Center, Université de Montréal 3175, Chemin Côte Sainte Catherine, Montréal, Québec, H3T 1C5 Canada. fax: (514) 345-4896.
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