KCNQ1 gain-of-function mutation in familial atrial fibrillation.
نویسندگان
چکیده
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 alpha 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.
منابع مشابه
The S140G KCNQ1 atrial fibrillation mutation affects 'I(KS)' profile during both atrial and ventricular action potentials.
KCNQ1 is responsible for the pore-forming subunit of channels that mediate the cardiac 'IKs' potassium channel current. The S140G KCNQ1 gain-of-function mutation is responsible for a form of heritable atrial fibrillation. Here the action potential (AP) voltage clamp technique was used to elucidate the effect of S140G KCNQ1 on the profile of recombinant I(Ks) during atrial and ventricular APs ap...
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Although atrial fibrillation is the most common serious cardiac arrhythmia, the fundamental molecular pathways remain undefined. Mutations in KCNQ1, one component of a sympathetically activated cardiac potassium channel complex, cause familial atrial fibrillation, although the mechanisms in vivo are unknown. We show here that mice with deletion of the KCNQ1 protein partner KCNE1 have spontaneou...
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ورودعنوان ژورنال:
- Science
دوره 299 5604 شماره
صفحات -
تاریخ انتشار 2003