Long Qt Syndrome 12, also known as lqt12, is related to cardiac conduction defect and paroxysmal extreme pain disorder, and has symptoms including syncopal episode An important gene associated with Long Qt Syndrome 12 is SNTA1 (Syntrophin Alpha 1), and among its related pathways/superpathways are Transmission across Chemical Synapses and Cardiac conduction. Affiliated tissues include heart and heart-atrium, and related phenotypes are syncope and prolonged qtc interval