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KCNQ1A gene on chromosome 11p15.5 that encodes a voltage-gated potassium channel required for the repolarisation phase of the cardiac action potential. The KCNQ1 gene product can form heteromultimers with two other potassium channel proteins, KCNE1 and KCNE3.
KCNQ1 mutations are associated with hereditary long QT syndrome/Romano-Ward syndrome, Jervell and Lange-Nielsen syndrome and familial atrial fibrillation.
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LQT1, LQT2, LQT3 Molecular medicine Three genes, located on chromosomes 11, 7, and 3 respectively, that have been linked to the long QT syndrome. See Long QT syndrome.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.