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Genomic organization and mutational analysis of HERG, a gene responsible for familial long QT syndrome.

Abstract：

:Familial long QT syndrome (LQTS) is characterized by prolonged ventricular repolarization. Clinical symptoms include recurrent syncopal attacks, and sudden death may occur as a result of ventricular tachyarrhythmias. Three genes responsible for this syndrome (KVLQT1, HERG, and SCN5A) have been identified so far, and mutations have been reported on the basis of partially characterized genomic organization. To optimize the search for HERG mutations, we have determined the genomic structure of HERG and investigated mutations in LQTS families. Human genomic clones containing the HERG gene were isolated from a human genomic library by using reverse-transcribed polymerase chain reaction (RT-PCR) products from this gene as probes. We determined exon/intron boundaries and flanking intronic sequences by using primers synthesized on the basis of the HERG cDNA sequence available in the DNA database. HERG was shown to consist of 15 exons spanning approximately 19 kb on chromosome 7q35. Subsequently, we synthesized oligonucleotide primers to cover the entire coding region and searched for mutations in 36 Japanese LQTS families. When genomic DNA from each proband was examined by the PCR/single-strand conformation polymorphism technique followed by direct DNA sequencing, five novel mutations were detected. Each mutation was present in affected relatives of the respective proband. This work should increase the efficiency of screening mutations associated with HERG.

journal_name

Hum Genet

journal_title

Human genetics

authors

Itoh T,Tanaka T,Nagai R,Kamiya T,Sawayama T,Nakayama T,Tomoike H,Sakurada H,Yazaki Y,Nakamura Y

doi

10.1007/s004390050717

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

435-9

issue

4

eissn

0340-6717

issn

1432-1203

journal_volume

102

pub_type

杂志文章

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