Inherited Isolated Adrenal Insufficiency Due to Partial Cyp11a1 Deficiency An important gene associated with Inherited Isolated Adrenal Insufficiency Due to Partial Cyp11a1 Deficiency is CYP11A1 (Cytochrome P450 Family 11 Subfamily A Member 1). Affiliated tissues include adrenal gland and uterus, and related phenotypes are agenesis of corpus callosum and failure to thrive