Mutation in Glycerol-3-Phosphate Dehydrogenase 1–Like Gene ( <i>GPD1-L</i> ) Decreases Cardiac Na ⁺ Current and Causes Inherited Arrhythmias

GPD1-L is a novel gene that may affect trafficking of the cardiac Na+ channel to the cell surface. A GPD1-L mutation decreases SCN5A surface membrane expression, reduces inward Na+ current, and causes Brugada syndrome.