A novel trafficking-defective HCN4 mutation is associated with early-onset atrial fibrillation.
A novel trafficking-defective HCN4 mutation is associated with early-onset atrial fibrillation.
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DOI:
10.1016/j.hrthm.2014.03.002
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发表时间:
2014-06
期刊:
影响因子:
5.5
通讯作者:
Ellinor, Patrick T.
中科院分区:
文献类型:
--
作者:
Macri, Vincenzo;Mahida, Saagar N.;Zhang, Michael L.;Sinner, Moritz F.;Dolmatova, Elena V.;Tucker, Nathan R.;McLellan, Micheal;Shea, Marisa A.;Milan, David J.;Lunetta, Kathryn L.;Benjamin, Emelia J.;Ellinor, Patrick T.
Atrial fibrillation (AF) is the most common arrhythmia, and a recent genome-wide association study identified HCN4 as a novel AF susceptibility locus. HCN4 encodes for the cardiac pacemaker channel and HCN4 mutations are associated with familial sinus bradycardia and AF. To determine whether novel variants in the coding region of HCN4 contribute to the susceptibility for AF. We sequenced the coding region of HCN4 for novel variants from 527 cases with early-onset AF from the Massachusetts General Hospital AF Study and 443 referents from the Framingham Heart Study. We used site-directed mutagenesis, cellular electrophysiology, immunocytochemistry and confocal microscopy to functionally characterize novel variants. We found the frequency of novel coding HCN4 variants was 2-fold greater for individuals with AF (seven variants) compared to the referents (three variants). We determined that one, (p.Pro257Ser, located in the amino-terminus adjacent to the first transmembrane spanning domain) of the seven novel HCN4 variants in our AF cases did not traffick to cell membrane while the remaining six were not functionally different from wild type. Also, the three novel variants in our referents did not alter function compared to wild type. Co-expression studies showed that the p.Pro257Ser mutant channel failed to co-localize with the wild type HCN4 channel on the cell membrane. Our findings are consistent with HCN4 haploinsufficiency as the likely mechanism for early-onset AF in the p.Pro257Ser carrier.
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