Mutations in the genes KCND2 and KCND3 encoding the ion-channels conducting the cardiac transient outward current is not a frequent cause of Long QT syndrome.
Proceedings article published in 2002 by
R. Frank-Hansen,
Rs Andersen,
La Larsen 
,
C. Jespersgaard,
M. Christiansen
,
C. Jespersgaard,
M. Christiansen
