Circulation: Cardiovascular Genetics. 10(6):e001780, DECEMBER 2017

DOI: 10.1161/CIRCGENETICS.117.001780

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PMID: 29212899

Issn Print: 1942-325X

Publication Date: December 2017


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Novel Mutation in FLNC (Filamin C) Causes Familial Restrictive Cardiomyopathy

Nathan Tucker;Micheal McLellan;Dongjian Hu;Jiangchuan Ye;Victoria Parsons;Robert Mills;Sebastian Clauss;Elena Dolmatova;Marisa Shea;David Milan;Nandita Scott;Mark Lindsay;Steven Lubitz;Ibrahim Domian;James Stone;Honghuang Lin;Patrick Ellinor;

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Abstract

Background—Restrictive cardiomyopathy (RCM) is a rare cardiomyopathy characterized by impaired diastolic ventricular function resulting in a poor clinical prognosis. Rarely, heritable forms of RCM have been reported, and mutations underlying RCM have been identified in genes that govern the contractile function of the cardiomyocytes.Methods and Results—We evaluated 8 family members across 4 generations by history, physical examination, electrocardiography, and echocardiography. Affected individuals presented with a pleitropic syndrome of progressive RCM, atrioventricular septal defects, and a high prevalence of atrial fibrillation. Exome sequencing of 5 affected members identified a single novel missense variant in a highly conserved residue of FLNC (filamin C; p.V2297M). FLNC encodes filamin C—a protein that acts as both a scaffold for the assembly and organization of the central contractile unit of striated muscle and also as a mechanosensitive signaling molecule during cell migration and shear stress. Immunohistochemical analysis of FLNC localization in cardiac tissue from an affected family member revealed a diminished localization at the z disk, whereas traditional localization at the intercalated disk was preserved. Stem cell-derived cardiomyocytes mutated to carry the effect allele had diminished contractile activity when compared with controls.Conclusion—We have identified a novel variant in FLNC as pathogenic variant for familial RCM—a finding that further expands on the genetic basis of this rare and morbid cardiomyopathy.

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