Antioxidant enzyme and DNA base repair genetic risk scores’ associations with systemic oxidative stress biomarker in pooled cross-sectional studies

Frontiers in Aging

Aging

Ziling Mao¹  Abigail L. H. Gray¹  Roberd M. Bostick²  Bharat Thyagarajan³ 

[1] Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, United States;Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, United States;Winship Cancer Institute, Emory University, Atlanta, GA, United States;Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, United States;

关键词: oxidative stress;    oxidative balance;    F2-isoprostanes;    genetic risk score;    antioxidant enzymes;    DNA base excision repair;    oxidative balance score;    cross-sectional studies;   

DOI  :  10.3389/fragi.2023.1000166

 received in 2022-07-21, accepted in 2023-03-28,  发布年份 2023

来源: Frontiers

【 摘 要 】

Background: Oxidative stress is hypothesized to contribute to the pathogenesis of several chronic diseases. Numerous dietary and lifestyle factors are associated with oxidative stress; however, little is known about associations of genetic factors, individually or jointly with dietary and lifestyle factors, with oxidative stress in humans.Methods: We genotyped 22 haplotype-tagging single nucleotide polymorphisms (SNPs) in 3 antioxidant enzyme (AE) genes and 79 SNPs in 14 DNA base excision repair (BER) genes to develop oxidative stress-specific AE and BER genetic risk scores (GRS) in two pooled cross-sectional studies (n = 245) of 30–74-year-old, White, cancer- and inflammatory bowel disease-free adults. Of the genotypes, based on their associations with a systemic oxidative stress biomarker, plasma F2-isoprostanes (FiP) concentrations, we selected 4 GSTP1 SNPs for an AE GRS, and 12 SNPs of 5 genes (XRCC1, TDG, PNKP, MUTYH, and FEN1) for a BER GRS. We also calculated a previously-reported, validated, questionnaire-based, oxidative stress biomarker-weighted oxidative balance score (OBS) comprising 17 anti- and pro-oxidant dietary and lifestyle exposures, with higher scores representing a higher predominance of antioxidant exposures. We used general linear regression to assess adjusted mean FiP concentrations across GRS and OBS tertiles, separately and jointly.Results: The adjusted mean FiP concentrations among those in the highest relative to the lowest oxidative stress-specific AE and BER GRS tertiles were, proportionately, 11.8% (p = 0.12) and 21.2% (p = 0.002) higher, respectively. In the joint AE/BER GRS analysis, the highest estimated mean FiP concentration was among those with jointly high AE/BER GRS. Mean FiP concentrations across OBS tertiles were similar across AE and BER GRS strata.Conclusion: Our pilot study findings suggest that DNA BER, and possibly AE, genotypes collectively may be associated with systemic oxidative stress in humans, and support further research in larger, general populations.

【 授权许可】

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Copyright © 2023 Mao, Gray, Thyagarajan and Bostick.