title: Novel KCNA5 loss-of-function mutations responsible for atrial fibrillation.
abstract: Accumulating evidence reveals that genetic variants play pivotal roles in familial atrial fibrillation (AF). However, the molecular defects in most patients with AF remain to be identified. Here, we report on three novel KCNA5 mutations that were identified in 4 of 120 unrelated AF families. Among them, T527M was found in two AF families, and A576V and E610K in two other AF families, respectively. The mutations T527M and A576V were also detected in 2 and 1 of 256 patients with idiopathic AF, respectively. The same mutations were not observed in 200 secondary AF patients and 500 controls. Functional analyses revealed consistent loss-of-function effects of mutant KCNA5 proteins on the ultrarapidly activating delayed rectifier potassium currents. These findings expand the spectrum of mutations in KCNA5 linked to AF and provide new insight into the molecular mechanism involved in AF.
authors.affiliation: Department of Cardiology, Tongji Hospital, Tongji University School of Medicine, Shanghai, China.
authors.forename: Yiqing
authors.initials: Y
authors.lastname: Yang
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Lin
authors.forename: Yanzong
authors.initials: Y
authors.lastname: Yang
authors.forename: Kui
authors.initials: K
authors.lastname: Hong
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Jinqiu
authors.initials: J
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Dinghong
authors.initials: D
authors.lastname: Yan
authors.forename: Dandan
authors.initials: D
authors.lastname: Liang
authors.forename: Junjie
authors.initials: J
authors.lastname: Xiao
authors.forename: Hongmei
authors.initials: H
authors.lastname: Jin
authors.forename: Jie
authors.initials: J
authors.lastname: Wu
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yi-Han
authors.initials: YH
authors.lastname: Chen