Atrioventricular Septal Defect 2, also known as atrioventricular septal defect, partial, with heterotaxy syndrome, is related to chromosome 3pter-p25 deletion syndrome and heart septal defect. An important gene associated with Atrioventricular Septal Defect 2 is CRELD1 (Cysteine Rich With EGF Like Domains 1). Affiliated tissues include heart and lung, and related phenotypes are atrioventricular canal defect and dextrocardia