Abstract:
AIMS:Atrial fibrillation (AF) is the most common cardiac arrhythmia, and early-onset lone AF has been linked to mutations in genes encoding ion channels. Mutations in the pore forming subunit KV4.3 leading to an increase in the transient outward potassium current (Ito) have previously been associated with the Brugada Syndrome. Here we aim to determine if mutations in KV4.3 or in the auxiliary subunit K(+) Channel-Interacting Protein (KChIP) 2 are associated with early-onset lone AF. METHODS AND RESULTS:Two hundred and nine unrelated early-onset lone AF patients (<40 years) were recruited. The entire coding sequence of KCND3 and KCNIP2 was bidirectionally sequenced. One novel non-synonymous mutation A545P was found in KCND3 and was neither present in the control group (n = 432 alleles) nor in any publicly available database. The proband had onset of persistent AF at the age of 22, and no mutations in genes previously associated with AF were found. Electrophysiological analysis of KV4.3-A545P expressed in CHO-K1 cells, revealed that peak-current density was increased and the onset of inactivation was slower compared with WT, resulting in a significant gain-of-function both in the absence and the presence of KChIP2. CONCLUSION:Gain-of-function mutations in KV4.3 have previously been described in Brugada Syndrome, however, this is the first report of a KV4.3 gain-of-function mutation in early-onset lone AF. This association of KV4.3 gain-of-function and early-onset lone AF further supports the hypothesis that increased potassium current enhances AF susceptibility.
journal_name
Cardiovasc Resjournal_title
Cardiovascular researchauthors
Olesen MS,Refsgaard L,Holst AG,Larsen AP,Grubb S,Haunsø S,Svendsen JH,Olesen SP,Schmitt N,Calloe Kdoi
10.1093/cvr/cvt028subject
Has Abstractpub_date
2013-06-01 00:00:00pages
488-95issue
3eissn
0008-6363issn
1755-3245pii
cvt028journal_volume
98pub_type
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journal_title:Cardiovascular research
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更新日期:2007-09-01 00:00:00
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更新日期:2016-03-01 00:00:00
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journal_title:Cardiovascular research
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journal_title:Cardiovascular research
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journal_title:Cardiovascular research
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pub_type: 杂志文章
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journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/j.cardiores.2004.01.031
更新日期:2004-06-01 00:00:00
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更新日期:1978-03-01 00:00:00