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- W1995710513 abstract "The clinical and genetic characteristics of inherited arrhythmic disorders in Japan are briefly summarized. The incidence of hereditary long QT syndrome (LQTS) in Japan seems comparable to that in western countries. The genotypes are mainly LQT1 and LQT2; LQT3 and other types are rare. Mutations found in Japanese LQTS families are mostly novel compared to mutations reported in other countries and in different ethnic populations. Functional assays of the mutants in heterologous expression systems have disclosed novel mechanisms of current suppression in LQT1 and LQT2, and of gain of function in LQT3. Mutations in KCNJ2 may provide a new genotype (LQT7) of LQTS. In addition, mutations or single nucleotide polymorphisms in the channel genes responsible for LQTS (KvLQT1, HERG, and SCN5A) may predispose to drug-induced LQTS. A relatively high prevalence of Brugada syndrome is suspected in the Japanese population, and 1 of approximately 2,000 asymptomatic individuals present Brugada-type ECG changes upon annual examination. Genetic screening of the symptomatic Brugada syndrome and suspected cases has revealed SCN5A mutations in only approximately 12%. Therefore, the genetic basis of the majority of cases is not known. The expressed Na+ current of SCN5A mutant channels showed the phenotype of decreased channel function commonly seen in Brugada mutations. A case of idiopathic ventricular fibrillation was found to have a novel mutation in SCN5A, in which the expressed current showed marked suppression of channel function." @default.
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- W1995710513 date "2003-04-01" @default.
- W1995710513 modified "2023-10-16" @default.
- W1995710513 title "Inherited Arrhythmic Disorders in Japan" @default.
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- W1995710513 doi "https://doi.org/10.1046/j.1540-8167.2003.02435.x" @default.
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