RAAS genes encoding renin (REN), angiotensinogen (AGT), angiotensin-converting enzyme (ACE), angiotensin type 1 receptor (AGTR1) and aldosterone synthase gene (CYP11B2) have been widely investigated in different ethnic populations, and dozens of single nucleotide polymorphisms (SNPs) within RAAS genes have been reported to be significantly associated with essential hypertension [9]–[11]. The gene discussed is CYP11B2; the disease is hypertensive disorder.