Cardiophile MD Archive

Posts Tagged ‘SCN5A

Andersen Syndrome

Posted by: Johnson Francis on: 20 Sep, 2009

The gene which is affected in Andersen Syndrome (LQT7) is: a. KCNH2 b. KCNQ1 c. SCN5A d. KCNJ2 Answer: d In Andersen syndrome, KCNJ2 which codes for Ik1 potassium channel (Kir2.1) is affected by a loss of function mutation. This results in a reduced outward potassium current. Andersen syndrome is characterised by long QT, periodic [...]

Long QT syndrome (LQTS) genes

Posted by: Johnson Francis on: 06 Dec, 2008

10 LQTS genes have been described from 1991 to 2007. LQT1 gene is KCNQ1 and it encodes for alpha (KvLQT1) subunit of the potassium channel conducting the IKs current. IKs is the slow component of the delayed rectifier current, which in turn is the major repolarizing current during phase 3 of the cardiac action potential. [...]