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Li X, Zhong B, Han W, Zhao N, Liu W, Sui Y, Wang Y, Lu Y, Wang H, Li J, Jiang M. Two novel mutations in myosin binding protein C slow causing distal arthrogryposis type 2 in two large Han Chinese families may suggest important functional role of immunoglobulin domain C2. PLoS One 2015; 10:e0117158. [PMID: 25679999 PMCID: PMC4332675 DOI: 10.1371/journal.pone.0117158] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 12/18/2014] [Indexed: 12/19/2022] Open
Abstract
Distal arthrogryposes (DAs) are a group of disorders that mainly involve the distal parts of the limbs and at least ten different DAs have been described to date. DAs are mostly described as autosomal dominant disorders with variable expressivity and incomplete penetrance, but recently autosomal recessive pattern was reported in distal arthrogryposis type 5D. Mutations in the contractile genes are found in about 50% of all DA patients. Of these genes, mutations in the gene encoding myosin binding protein C slow MYBPC1 were recently identified in two families with distal arthrogryposis type 1B. Here, we described two large Chinese families with autosomal dominant distal arthrogryposis type 2(DA2) with incomplete penetrance and variable expressivity. Some unique overextension contractures of the lower limbs and some distinctive facial features were present in our DA2 pedigrees. We performed follow-up DNA sequencing after linkage mapping and first identified two novel MYBPC1 mutations (c.1075G>A [p.E359K] and c.956C>T [p.P319L]) responsible for these Chinese DA2 families of which one introduced by germline mosacism. Each mutation was found to cosegregate with the DA2 phenotype in each family but not in population controls. Both substitutions occur within C2 immunoglobulin domain, which together with C1 and the M motif constitute the binding site for the S2 subfragment of myosin. Our results expand the phenotypic spectrum of MYBPC1-related arthrogryposis multiplex congenita (AMC). We also proposed the possible molecular mechanisms that may underlie the pathogenesis of DA2 myopathy associated with these two substitutions in MYBPC1.
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Affiliation(s)
- Xuefu Li
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Bomeng Zhong
- Emergency department, Nanjing First Hospital, Nanjing, China
| | - Weitian Han
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Ning Zhao
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Wei Liu
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Yu Sui
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Yawen Wang
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Yongping Lu
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Hong Wang
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Jianxin Li
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
| | - Miao Jiang
- Key Laboratory of Reproductive Health of Liaoning Province, Shenyang, China
- * E-mail:
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Peled Y, Gramlich M, Yoskovitz G, Feinberg MS, Afek A, Polak-Charcon S, Pras E, Sela BA, Konen E, Weissbrod O, Geiger D, Gordon PMK, Thierfelder L, Freimark D, Gerull B, Arad M. Titin mutation in familial restrictive cardiomyopathy. Int J Cardiol 2013; 171:24-30. [PMID: 24315344 DOI: 10.1016/j.ijcard.2013.11.037] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 11/06/2013] [Accepted: 11/17/2013] [Indexed: 01/12/2023]
Abstract
BACKGROUND Familial restrictive cardiomyopathy (RCM) caused by a single gene mutation is the least common of the inherited cardiomyopathies. Only a few RCM-causing mutations have been described. Most mutations causing RCM are located in sarcomere protein genes which also cause hypertrophic cardiomyopathy (HCM). Other genes associated with RCM include the desmin and familial amyloidosis genes. In the present study we describe familial RCM with severe heart failure triggered by a de novo mutation in TTN, encoding the huge muscle filament protein titin. METHODS AND RESULTS Family members underwent physical examination, ECG and Doppler echocardiogram studies. The family comprised 6 affected individuals aged 12-35 years. Linkage to candidate loci was performed, followed by gene sequencing. Candidate loci/gene analysis excluded 18 candidate genes but showed segregation with a common haplotype surrounding the TTN locus. Sequence analysis identified a de novo mutation within exon 266 of the TTN gene, resulting in the replacement of tyrosine by cysteine. p.Y7621C affects a highly conserved region in the protein within a fibronectin-3 domain, belonging to the A/I junction region of titin. No other disease-causing mutation was identified in cardiomyopathy genes by whole exome sequencing. CONCLUSIONS Our study shows, for the first time, that mutations in TTN can cause restrictive cardiomyopathy. The giant filament titin is considered to be a determinant of a resting tension of the sarcomere and this report provides genetic evidence of its crucial role in diastolic function.
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Affiliation(s)
- Yael Peled
- Heart Failure Service and Heart Institute, Tel Aviv University, Tel Aviv, Israel
| | - Michael Gramlich
- Max Delbrueck Center for Molecular Medicine, Berlin, Germany; Department of Cardiology, University of Tuebingen, Germany
| | - Guy Yoskovitz
- Heart Failure Service and Heart Institute, Tel Aviv University, Tel Aviv, Israel; Gertner Institute of Medical Genetics, Tel Aviv University, Tel Aviv, Israel
| | - Micha S Feinberg
- Heart Failure Service and Heart Institute, Tel Aviv University, Tel Aviv, Israel
| | - Arnon Afek
- Department of Pathology, Tel Aviv University, Tel Aviv, Israel
| | | | - Elon Pras
- Gertner Institute of Medical Genetics, Tel Aviv University, Tel Aviv, Israel
| | - Ben-Ami Sela
- Institute of Chemical Pathology, Tel Aviv University, Tel Aviv, Israel
| | - Eli Konen
- Department of Diagnostic Imaging, Sheba Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Omer Weissbrod
- Computer Science Department, The Technion, Haifa, Israel
| | - Dan Geiger
- Computer Science Department, The Technion, Haifa, Israel
| | - Paul M K Gordon
- Alberta Children's Hospital Research Institute Genomics and Bioinformatics Facility, University of Calgary, Calgary, Canada
| | | | - Dov Freimark
- Heart Failure Service and Heart Institute, Tel Aviv University, Tel Aviv, Israel
| | - Brenda Gerull
- Max Delbrueck Center for Molecular Medicine, Berlin, Germany; Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Canada
| | - Michael Arad
- Heart Failure Service and Heart Institute, Tel Aviv University, Tel Aviv, Israel.
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