LDB3 and idiopathic dilated cardiomyopathy: Sato et al4 proposed that disruptions in the microcirculation during development may facilitate this abnormal development, whereas Shan et al5 reported on a mutation in the LDB3 or ZASP gene as a cause of congenital LVA, a gene also implicated in cases of idiopathic dilated cardiomyopathy.5