Myosin binding protein C1: A novel gene for autosomal dominant distal arthrogryposis type 1

Christina A. Gurnett, David M. Desruisseau, Kevin McCall, Ryan Choi, Zachary I. Meyer, Michael Talerico, Sara E. Miller, Jeong Sun Ju, Alan Pestronk, Anne M. Connolly, Todd E. Druley, Conrad C. Weihl, Mathew B. Dobbs

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

Distal arthrogryposis type I (DA1) is a disorder characterized by congenital contractures of the hands and feet for which few genes have been identified. Here we describe a five-generation family with DA1 segregating as an autosomal dominant disorder with complete penetrance. Genome-wide linkage analysis using Affymetrix GeneChip Mapping 10K data from 12 affected members of this family revealed a multipoint LODmax of 3.27 on chromosome 12q. Sequencing of the slow-twitch skeletal muscle myosin binding protein C1 (MYBPC1), located within the linkage interval, revealed a missense mutation (c.706T>C) that segregated with disease in this family and causes a W236R amino acid substitution. A second MYBPC1 missense mutation was identified (c.2566T>C)(Y856H) in another family with DA1, accounting for an MYBPC1 mutation frequency of 13% (two of 15). Skeletal muscle biopsies from affected patients showed type I (slow-twitch) fibers were smaller than type II fibers. Expression of a green fluorescent protein (GFP)-tagged MYBPC1 construct containing WT and DA1 mutations in mouse skeletal muscle revealed robust sarcomeric localization. In contrast, a more diffuse localization was seen when non-fused GFP and MYBPC1 proteins containing corresponding MYBPC3 amino acid substitutions (R326Q, E334K) that cause hypertrophic cardiomyopathy were expressed. These findings reveal that the MYBPC1 is a novel gene responsible for DA1, though the mechanism of disease may differ from how some cardiac MYBPC3 mutations cause hypertrophic cardiomyopathy.

Original languageEnglish
Article numberddp587
Pages (from-to)1165-1173
Number of pages9
JournalHuman molecular genetics
Volume19
Issue number7
DOIs
StatePublished - Jan 2 2010

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