Skeletal muscle expression and abnormal function of beta-myosin in hypertrophic cardiomyopathy.
Hypertrophic cardiomyopathy is an important inherited disease. The phenotype has been linked, in some kindreds, to the beta-myosin heavy chain (beta-MHC) gene. Missense and silent mutations in the beta-MHC gene were used as markers to demonstrate the expression of mutant and normal cardiac beta-MHC gene message in skeletal muscle of hypertrophic cardiomyopathy patients. Mutant beta-myosin, also shown to be present in skeletal muscle by Western blot analysis, translocated actin filaments slower than normal controls in an in vitro motility assay. Thus, single amino acid changes in beta-myosin result in abnormal actomyosin interactions, confirming the primary role of missense mutations in beta-MHC gene in the etiology of hypertrophic cardiomyopathy.
Laboratory of Molecular Cardiology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892.
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G
Cuda
L
L
Fananapazir
W S
WS
Zhu
J R
JR
Sellers
N D
ND
Epstein
D008841:Actin Cytoskeleton / Q000378:metabolism; D000199:Actins / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D001706:Biopsy; D002312:Cardiomyopathy, Hypertrophic / Q000209:etiology / Q000235:genetics*; D015870:Gene Expression; D006801:Humans; D008969:Molecular Sequence Data; D009068:Movement; D009132:Muscles / Q000378:metabolism*; D009154:Mutation / Q000235:genetics*; D009218:Myosins / Q000235:genetics*; D017386:Sequence Homology, Amino Acid
D000199:Actins; D009218:Myosins