Background: Hypertrophic cardiomyopathy (HCM), which is inherited as an autosomal dominant trait, is the most prevalent hereditary cardiac disease. Although there are several reports on the systematic screening of mutations in the disease-causing genes in European and American populations, only limited information is available for Asian populations, including Japanese.
Methods and Results: Genetic screening of disease-associated mutations in 8 genes for sarcomeric proteins,
MYH7,
MYBPC3,
MYL2,
MYL3,
TNNT2,
TNNI3,
TPM1, and
ACTC, was performed by direct sequencing in 112 unrelated Japanese proband patients with familial HCM; 37 different mutations, including 13 novel ones in 5 genes,
MYH7,
MYBPC3,
TNNT2,
TNNI3, and
TPM1, were identified in 49 (43.8%) patients. Among them, 3 carried compound heterozygous mutations in
MYBPC3 or
TNNT2. The frequency of patients carrying the
MYBPC3,
MYH7, and
TNNT2 mutations were 19.6%, 10.7%, and 8.9%, respectively, and the most frequently affected genes in the northeastern and southwestern parts of Japan were
MYBPC3 and
MYH7, respectively. Several mutations were found in multiple unrelated proband patients, for which the geographic distribution suggested founder effects of the mutations.
Conclusions: This study demonstrated the frequency and distribution of mutations in a large cohort of familial HCM in Japan. (
Circ J 2012;
76: 453-461)
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