MYBPC3's alternate ending: consequences and therapeutic implications of a highly prevalent 25 bp deletion mutation Journal Article

Authors: Kuster, D. W.; Sadayappan, S
Article Title: MYBPC3's alternate ending: consequences and therapeutic implications of a highly prevalent 25 bp deletion mutation
Abstract: Hypertrophic cardiomyopathy (HCM) is the most common form of inherited cardiac disease and the leading cause of sudden cardiac death in young people. HCM is caused by mutations in genes encoding contractile proteins. Cardiac myosin binding protein-C (cMyBP-C) is a thick filament contractile protein that regulates sarcomere organization and cardiac contractility. About 200 different mutations in the cMyBP-C gene (MYBPC3) have thus far been reported as causing HCM. Among them, a 25 base pair deletion in the branch point of intron 32 of MYBPC3 is widespread, particularly affecting people of South Asian descent, with 4% of this population carrying the mutation. This polymorphic mutation results in skipping of exon 33 and a reading frame shift, which, in turn, replaces the last 65 amino acids of the C-terminal C10 domain of cMyBP-C with a novel sequence of 58 residues (cMyBP-C(C10mut)). Carriers of the 25 base pair deletion mutation are at increased risk of developing cardiomyopathy and heart failure. Because of the high prevalence of this mutation in certain populations, genetic screening of at-risk groups might be beneficial. Scientifically, the functional consequences of C-terminal mutations and the precise mechanisms leading to HCM should be defined using induced pluripotent stem cells and engineered heart tissue in vitro or mouse models in vivo. Most importantly, therapeutic strategies that include pharmacology, gene repair, and gene therapy should be developed to prevent the adverse clinical effects of cMyBP-C(C10mut). This review article aims to examine the effects of cMyBP-C(C10mut) on cardiac function, emphasizing the need for the development of genetic testing and expanded therapeutic strategies.
Keywords: Humans; Animals; Amino Acid Sequence; Myocardial Contraction/physiology; Asian Continental Ancestry Group/genetics; Sequence Deletion; Cardiomyopathy, Hypertrophic/genetics; Carrier Proteins/genetics/physiology; Frameshift Mutation
Journal Title: Pflugers Archiv : European journal of physiology
Volume: 466
Issue: 2
ISSN: 1432-2013; 0031-6768
Publisher: Unknown  
Journal Place: Germany
Date Published: 2014
Start Page: 207
End Page: 213
Language: eng
Notes: LR: 20150203; GR: K02 HL114749/HL/NHLBI NIH HHS/United States; GR: K02HL114749/HL/NHLBI NIH HHS/United States; GR: R01 HL105826/HL/NHLBI NIH HHS/United States; GR: R01HL105826/HL/NHLBI NIH HHS/United States; JID: 0154720; 0 (Carrier Proteins); 0 (myosin-binding protein C); NIHMS548219; OID: NLM: NIHMS548219; OID: NLM: PMC3946836; 2013/11/12 [received]; 2013/12/02 [accepted]; 2013/11/27 [revised]; 2013/12/11 [aheadofprint]; ppublish