Complex sentence: Mutations in the "ANK2" gene, specifically a Glu1425Gly mutation, causes dominantly-inherited long QT syndrome, type 4, cardiac arrhythmia.
Split into simpler sentences: Mutations in the "ANK2" gene have been associated with cardiac arrhythmia syndrome of varying types. A Glu1425Gly mutation in "ANK2" causes dominantly-inherited long QT syndrome, type 4, cardiac arrhythmia.