The cardiac sodium channel mutation delQKP 1507-1509 is associated with the expanding phenotypic spectrum of LQT3, conduction disorder, dilated cardiomyopathy, and high incidence of youth sudden death.
Shi R, Zhang Y, Yang C, Huang C, Zhou X, Qiang H, Grace AA, Huang CL, Ma A. Europace. 2008 Nov; 10(11):1329-35. Epub 2008 Aug 12.