Aldosterone synthase is found within the zona glomerulosa at the outer edge of the adrenal cortex.
Aldosterone synthase normally is not ACTH sensitive, and is only activated by angiotensin II.
[citation needed] The genes encoding aldosterone synthase and 11β-hydroxylase are 95% identical and are close together on chromosome 8.
[citation needed] The product of this hybrid gene is aldosterone synthase that is ACTH-sensitive[2] in the zona fasciculata of the adrenal gland.
[4] Genetic testing is done to ascertain that the individual in question does indeed have the condition[5] In GRA, the hypersecretion of aldosterone and the accompanying hypertension are remedied when ACTH secretion is suppressed by administering glucocorticoids.