Construction of eukaryotic expression vector of congenital long QT syndrome related HERG gene A561V mutation and its expression in HEK293 cells / 中华医学遗传学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To investigate the protocol of the construction of HERG gene mutations, an A561V mutation which was detected in a Chinese congenital long QT syndrome (LQTS) family had been constructed and expressed in vitro.</p><p><b>METHODS</b>The A561V cloning vector PGEM-HERG-A561V was constructed by quick site-directed mutagenesis PCR. The A561V expressive vector pcDNA3-HERG-A561V was constructed by restriction enzymes. pRK5-GFP was cotransfected with pcDNA3-HERG-A561V or wild type pcDNA3-HERG into HEK293 cells by Superfect transfection reagent. The protein was measured by immunofluorescence.</p><p><b>RESULTS</b>Direct sequence analyses revealed a C to T transition at position 1682. The A561V mutation was correctly combined to eukaryotic expressive vector pcDNA3 and expressed in HEK293 cells. The protein of mutation was expressed in cytoplasm and cellular membrane while the wild type gene was expressed only on cellular membrane.</p><p><b>CONCLUSION</b>The protocol can be used successfully to construct and express HERG A561V mutation and it forms the basement of the further study on functions of mutation.</p>