Screening and analysis of the mutations on beta-myosin heavy chain gene in 3 Chinese families with hypertrophic cardiomyopathy / 中华心血管病杂志

<p><b>OBJECTIVE</b>To detect gene mutations on beta-myosin heavy chain gene MYH7 in 3 Chinese families with hypertrophic cardiomyopathy (HCM), and to analyze the correlation between genotype and phenotype.</p><p><b>METHODS</b>A denaturing high-performance liquid chromatography (DHPLC) and sequencing mutation screening of the exons (exon3-23) coding for MYH7 gene were performed in 3 Chinese families with HCM.</p><p><b>RESULTS</b>In this study, we identified several mutations in MYH7. A mutation of Thr441Met previously reported in a patient with Laing distal myopathy was first identified in one Chinese pedigree.</p><p><b>CONCLUSION</b>This study illustrated the high frequency of mutation in MYH7 gene in Chinese HCM families. Different mutations and carriers of the MYH7 gene present phenotypic heterogeneity. Mutation screening and analysis in HCM family could therefore facilitate the early HCM diagnosis and would be helpful for the prediction, prevention and early treatment of HCM linked with MYH7 gene mutation.</p>

Mutation analysis of beta myosin heavy chain gene in hypertrophic cardiomyopathy families / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To detect the gene mutations of beta-myosin heavy chain gene (MYH7) in Chinese pedigrees with hypertrophic cardiomyopathy (HCM), and to analyze the correlation between the genotype and phenotype.</p><p><b>METHODS</b>Exons 3, 5, 7-9, 11-16 and 18-23 of the MYH7 gene were amplified with PCR in three Chinese pedigrees with HCM. The products were sequenced. Sequence alignment between the detected and the standard sequences was performed.</p><p><b>RESULTS</b>A missense mutation of Thr441Met in exon 14 was identified in a pedigree, which was not detected in the controls. Several synonymous mutations of MYH7 gene were detected in the three pedigrees.</p><p><b>CONCLUSION</b>The mutation of Thr441Met, located in the actin binding domain of the globular head, was first identified in Chinese. It probably caused HCM. HCM is a heterogeneous disease. Many factors are involved in the process of its occurrence and development.</p>