rs662

A functional study investigating the effects of Tanacetum parthenium hydroalcoholic extract on paraoxonase 1 (PON1) enzyme activity and gene expression in hyperlipidemic rats. The extract significantly decreased serum cholesterol and triglycerides while increasing PON1 arylesterase activity (P < 0.001) and PON1 gene expression (P < 0.001). Molecular dynamics simulations demonstrated that apigenin, the plant's main antioxidant compound, binds to PON1 with high affinity (binding energy -7.73 kJ/mol) and induces conformational changes that enhance enzyme activity.

Two-stage genetic study examining 28 SNPs in oxidative stress genes (SOD1, SOD2, SOD3, PON1, PON2, PON3) in relation to nonsyndromic cleft lip with or without cleft palate (NSCL/CP) in Brazilian population. Initial transmission disequilibrium test (TDT) on 325 trios identified gene-gene interactions, which were validated in case-control analysis (722 cases, 866 controls). PON1 rs2237583 C allele showed protective effect (OR=0.79, 95% CI 0.67-0.93, p=0.005), and multiple significant PON1-PON2-PON3 gene-gene interactions were detected after Bonferroni correction.

Case-control study of 501 young stroke patients and 1,211 controls examining 58 polymorphisms in 17 genes involved in methionine metabolism. Multiple logistic regression identified four independent risk factors for early-onset ischaemic stroke: rs10037045 BHMT (OR 1.38, p=0.033), rs682985 BHMT2 (OR 1.46, p=0.017), rs1051319 CBS (OR 3.75, p<0.0001), and rs202680 FOLH1 (OR 3.00, p<0.0001). Haplotype analyses identified significant associations with BHMT, CBS, FOLH1, MTR, PON2, TCN2 and TYMS haplotypes and stroke risk.

Candidate gene association study of 67 genetic variants in 27 inflammation and DNA repair genes with hepatitis A virus (HAV) infection susceptibility in 6,779 NHANES III participants (2,619 non-Hispanic whites, 2,095 non-Hispanic blacks, 2,065 Mexican Americans). Among Mexican Americans, ABCB1 rs1045642 T allele was associated with lower HAV seropositivity risk (OR=0.79, p<0.001), while TGFB1 rs1800469 and XRCC1 rs1799782 T alleles were associated with increased risk (OR=1.38 and 1.57, respectively). CAT rs769214 and CYP2E1 rs2031920 showed marginal associations with decreased and increased HAV risk, respectively.

This prospective study of 1,399 patients undergoing coronary angiography investigated the PON1 Q192R polymorphism (rs662) and its relationship with cardiovascular disease risk and systemic oxidative stress. Participants with the QQ192 genotype had significantly lower PON1 activity and increased oxidative stress markers, with an adjusted hazard ratio of 2.05 (95% CI, 1.32-3.18) for all-cause mortality and 1.48 (95% CI, 1.09-2.03) for major adverse cardiac events compared to RR192/QR192 carriers. Higher PON1 activity levels were independently associated with reduced cardiovascular risk.

This family-based association study examined 12 polymorphisms in one-carbon metabolism genes (BHMT, CBS, MTHFD1, MTHFR, MTR, MTRR, SLC19A1, TCN2) and their associations with oral facial clefts in 553 Norwegian families. CBS rs234706 showed a significant maternal protective effect on cleft lip/palate risk (LRT p=0.008), with homozygous carriers of the T allele showing reduced risk (RR=0.50, 95% CI 0.26-0.96). MTHFR rs1801133 demonstrated a protective effect in the low-folate supplementation subset (RR=0.60-0.44), and maternal folic acid supplementation ≥400 μg/day was associated with 39% reduction in cleft lip/palate risk.