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Different expressivity of a ventricular essential myosin light chain gene Ala57Gly mutation in familial hypertrophic cardiomyopathy.

Abstract：

BACKGROUND:Familial hypertrophic cardiomyopathy (HCM) is a clinically and genetically heterogeneous disease of the sarcomere. Molecular genetic studies have shown that familial HCM involves mutations in 8 different genes that encode proteins of the myofibrillar apparatus. METHODS:We thoroughly searched these genes to find the mutations in 38 probands of unrelated families with familial HCM. RESULTS:We found a novel missense mutation that resulted in Ala57Gly amino acid substitution of the ventricular essential myosin light chain (vMLC1) gene in two unrelated Korean families with familial HCM and one Japanese patient. The mutated site is located in the putative helix-loop-helix region (named EF-hand domain) of the calcium-binding site that is highly conserved in vMLC1 isoforms across the various species. The phenotype of this mutation in the affected families is a classic asymmetric septal hypertrophy, and the disease penetrance in genotyped members older than 18 years is 78%. In one Korean family a 42-year-old woman and two brothers (34 and 38 years old) with the mutation had fully expressed the disease, but two sisters (39 and 29 years old) with the mutation had no phenotypic expression of HCM. CONCLUSIONS:Ala57Gly mutation in the vMLC1 gene may exhibit the classic form of familial HCM and widely different penetration of the disease phenotype in the family members with mutation, especially in women.

journal_name

Am Heart J

journal_title

American heart journal

authors

Lee W,Hwang TH,Kimura A,Park SW,Satoh M,Nishi H,Harada H,Toyama J,Park JE

doi

10.1067/mhj.2001.112487

subject

Has Abstract

pub_date

2001-02-01 00:00:00

pages

184-9

issue

2

eissn

0002-8703

issn

1097-6744

pii

S0002870301614248

journal_volume

141

pub_type

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