Rs662

rs662, also known as Q192R, is a SNP in the PON1 gene. It codes for amino acid 192 of the paraoxonase (PON) protein. Variants of this SNP affect PON catalytic efficiency and are correlated with Heart disease and trait-anxiety scores. The normal form, rs662(A), encodes a glutamine (Q), while the variant, rs662(G)), encodes an arginine (R). . While some populations show an association between this SNP and Heart disease, not all do.

Perhaps the most striking finding was reported in Japanese patients with non-insulin dependent diabetes mellitus (NIDDM). NIDDM patients with either one or two rs662(G) alleles had a 9 fold higher risk of coronary heart disease compared with rs662(A;A) NIDDM patients.

table of odds for cardiovascular disease outcomes

274 ovarian epithelial carcinoma cases and 452 controls. rs662 odds ratio 0.65 (CI: 0.44-0.95; p for allele-dose effect = 0.03) for ovarian cancer for women carrying the rs662(A) allele compared with women with the (G;G) genotype

rs1799864(G), rs3025058(A) and rs662 were associated with increased risk, and rs1800775(A) with reduced risk of recurrent venous thromboembolism

In a study of 461 participants in the HERITAGE cohort (172 African-American, 289 Caucasian), the combination of rs662 with rs854560 was found to significantly contribute to trait-anxiety scores. The high trait-anxiety group included "significantly more subjects homozygous to the Alzheimer's disease- predictive PON192 variant." The authors also cite another paper,, which found that this SNP affects PON's catalytic efficiency. From the context, it appears that it is the "R" variant, or rs662(G), which corresponds to the higher trait-anxiety scores and reduced catalytic efficiency, though this is less explicitly stated than one might hope.

No association between rs662 and amyotrophic lateral sclerosis was seen in this large meta-analysis.