Prevalence of at-risk genotypes for genotoxic effects decreases with age in a randomly selected population in Flanders: a cross sectional study

H.B. Ketelslegers, R.W.L. Godschalk, R.W. Gottschalk, A.M. Knaapen, G. Koppen, G. Schoeters, W.F. Baeyens, V. Nelen, J.P.M. Geraedts, J.H.M. van Delft, J.C.S. Kleinjans, N.A. Van Larebeke

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Abstract

Background: We hypothesized that in Flanders (Belgium), the prevalence of at-risk genotypes for genotoxic effects decreases with age due to morbidity and mortality resulting from chronic diseases. Rather than polymorphisms in single genes, the interaction of multiple genetic polymorphisms in low penetrance genes involved in genotoxic effects might be of relevance. Methods: Genotyping was performed on 399 randomly selected adults (aged 50-65) and on 442 randomly selected adolescents. Based on their involvement in processes relevant to genotoxicity, 28 low penetrance polymorphisms affecting the phenotype in 19 genes were selected (xenobiotic metabolism, oxidative stress defense and DNA repair, respectively 13, 6 and 9 polymorphisms). Polymorphisms which, based on available literature, could not clearly be categorized a priori as leading to an 'increased risk' or a 'protective effect' were excluded. Results: The mean number of risk alleles for all investigated polymorphisms was found to be lower in the 'elderly' (17.0 +/- 2.9) than the 'adolescent' (17.6 +/- 3.1) subpopulation (P = 0.002). These results were not affected by gender nor smoking. The prevalence of a high (> 17 = median) number of risk alleles was less frequent in the 'elderly' (40.6%) than the 'adolescent' (51.4%) subpopulation (P = 0.002). In particular for phase II enzymes, the mean number of risk alleles was lower in the 'elderly' (4.3 +/- 1.6) than the 'adolescent' age group (4.8 +/- 1.9) P < 0.001 and the prevalence of a high (> 4 = median) number of risk alleles was less frequent in the 'elderly' (41.3%) than the adolescent subpopulation (56.3%, P < 0.001). The prevalence of a high (> 8 = median) number of risk alleles for DNA repair enzyme-coding genes was lower in the 'elderly' (37,3%) than the 'adolescent' subpopulation (45.6%, P = 0.017). Conclusions: These observations are consistent with the hypothesis that, in Flanders, the prevalence of at-risk alleles in genes involved in genotoxic effects decreases with age, suggesting that persons carrying a higher number of at risk alleles (especially in phase II xenobiotic-metabolizing or DNA repair genes) are at a higher risk of morbidity and mortality from chronic diseases. Our findings also suggest that, regarding risk of disease associated with low penetrance polymorphisms, multiple polymorphisms should be taken into account, rather than single ones.
Original languageEnglish
Article number85
Pages (from-to)85
Number of pages11
JournalEnvironmental Health
Volume10
DOIs
Publication statusPublished - 5 Oct 2011

Keywords

  • DRUG-METABOLIZING-ENZYMES
  • BLADDER-CANCER RISK
  • S-TRANSFERASE M1
  • LUNG-CANCER
  • GENETIC POLYMORPHISMS
  • HUMAN LONGEVITY
  • POOLED-ANALYSIS
  • MYOCARDIAL-INFARCTION
  • GSTT1 POLYMORPHISMS
  • OXIDATIVE STRESS

Cite this

Ketelslegers, H. B., Godschalk, R. W. L., Gottschalk, R. W., Knaapen, A. M., Koppen, G., Schoeters, G., Baeyens, W. F., Nelen, V., Geraedts, J. P. M., van Delft, J. H. M., Kleinjans, J. C. S., & Van Larebeke, N. A. (2011). Prevalence of at-risk genotypes for genotoxic effects decreases with age in a randomly selected population in Flanders: a cross sectional study. Environmental Health, 10, 85. [85]. https://doi.org/10.1186/1476-069X-10-85