| Type | MGI:General | Description | exhibit slower conduction over the surface of the atrial and ventricular myocardium significant prolongation of the AH interval but not the HV interval, suggesting a conduction delay above the bundle of His conduction defects are correlated with dephosphorylation of Gja5 (connexin40) and Gja1 (connexin43) and upregulation of protein phosphatase 1 beta, suggesting that defective conduction is a result of impaired gap-junction conductance rather than assembly |