Heterotaxy, Visceral, 1, X-Linked, also known as congenital heart defects, multiple types, 1, x-linked, is related to congenital heart defects, multiple types, 4 and congenital heart defects, multiple types, 9. An important gene associated with Heterotaxy, Visceral, 1, X-Linked is ZIC3 (Zic Family Member 3). Affiliated tissues include heart and spleen, and related phenotypes are hypoplastic left heart and total anomalous pulmonary venous return