GJA5 and atrial standstill: Among them, GJA5 (OMIM * 121013) encodes gap junction protein, a5, and heterozygous pathogenic variants in GJA5 is associated with familial atrial fibrillation 11 (OMIM # 614049) and atrial standstill (OMIM # 108770) (Gollob et al., 2006).