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KCNQ1 Gain-of-Function Mutation in Familial Atrial Fibrillation

Chen, Yi-Han, Xu, Shi-Jie, Bendahhou, Saı̈d, Wang, Xiao-Liang, Wang, Ying, Xu, Wen-Yuan, Jin, Hong-Wei, Sun, Hao, Su, Xiao-Yan, Zhuang, Qi-Nan, Yang, Yi-Qing, Li, Yue-Bin, Liu, Yi, Xu, Hong-Ju, Li, Xiao-Fei, Ma, Ning, Mou, Chun-Ping, Chen, Zhu, Barhanin, Jacques, Huang, Wei·2003·Science

Abstract

Atrial fibrillation (AF) is a common cardiac arrhythmia whose molecular etiology is poorly understood. We studied a family with hereditary persistent AF and identified the causative mutation (S140G) in the KCNQ1 ( KvLQT1 ) gene on chromosome 11p15.5. The KCNQ1 gene encodes the pore-forming α subunit of the cardiac I Ks channel (KCNQ1/KCNE1), the KCNQ1/KCNE2 and the KCNQ1/KCNE3 potassium channels. Functional analysis of the S140G mutant revealed a gain-of-function effect on the KCNQ1/KCNE1 and the KCNQ1/KCNE2 currents, which contrasts with the dominant negative or loss-of-function effects of the KCNQ1 mutations previously identified in patients with long QT syndrome. Thus, the S140G mutation is likely to initiate and maintain AF by reducing action potential duration and effective refractory period in atrial myocytes.

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Crossref · 10.1126/science.1077771

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Metadata

Authors
Chen, Y.-H., Xu, S.-J., Bendahhou, S., Wang, X.-L., Wang, Y., Xu, W.-Y., Jin, H.-W., Sun, H., Su, X.-Y., Zhuang, Q.-N., Yang, Y.-Q., Li, Y.-B., Liu, Y., Xu, H.-J., Li, X.-F., Ma, N., Mou, C.-P., Chen, Z., Barhanin, J., & Huang, W.
Venue
Science
Published
2003-01-10
Volume
299
Issue
5604
Pages
251-254
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2152124063
Cited by
1,000
References
1
FWCI
31.85
Type
journal article
Language
en
Open access
closed

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