[A novel mutation of the KCNH2 gene in a family with congenital long QT syndrome].

OBJECTIVE: To perform mutation analysis in a family with long QT syndrome. METHODS: The medical record of the affected child and his parents were collected. The locus of gene associated with the long QT syndrome was mapped by linkage analysis. Mutation analysis was done by PCR-single strand conformation polymorphism (SSCP) and direct sequencing. RESULTS: A mutation (L539fs/47) and a SNP (L564L) were found in exon 7 of the KCNH2 gene of the proband. The mutation was from the father. CONCLUSION: A novel mutation of L539fs/47 in the KCNH2 gene was identified in the LQTS family, which might be the disease-causing mutation for the family.