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Influence of genetic polymorphisms, smoking, gender and age on CYP1A2 activity in a Turkish population
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences. (Pharmacogenetics)
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2009 (English)In: Pharmacogenomics (London), ISSN 1462-2416, E-ISSN 1744-8042, Vol. 10, no 5, 769-778 p.Article in journal (Refereed) Published
Abstract [en]

AIMS: To study the variation in CYP1A2 activity in relation to smoking, gender, age and CYP1A2 polymorphisms. MATERIALS & METHODS: CYP1A2 activity was determined by plasma paraxanthine:caffeine ratio (17X:137X) 4 h after the intake of a standardized cup of coffee in 146 Turkish healthy volunteers. Seven CYP1A2 polymorphisms (-3860G>A, -3113G>A, -2467del/T, -739T>G, -729C>T, -163C>A and 5347T>C) were analyzed. RESULTS: The 17X:137X ratios were increased in smokers (p < 0.0001) and tended to be higher in men both among nonsmokers (p = 0.051) and smokers (p = 0.064). Age-related differences were observed only among nonsmoking women (p = 0.024). The -163C>A polymorphism correlated with 17X:137X ratios only in smokers (p = 0.006). Furthermore, increased 17X:137X ratios were observed in CYP1A2 haplotype H4 (-3860G, -3113G, -2467del, -739T, -729C, -163A and 5347T) carriers in the overall study population (p = 0.026). Multiple regression analyses including smoking, gender, -163C>A genotype and age revealed a significant influence of smoking (p < 0.0001) and gender (p = 0.002) in the overall study population. However, in nonsmokers only the influence of gender remained significant (p = 0.021), while in smokers the influence of the -163C>A genotype held the statistical significance (p = 0.019). The influence of haplotype H4 remained significant (p = 0.028) in the overall study population in similar analyses. CONCLUSION: Smoking has the strongest impact on CYP1A2 activity, while gender and haplotype H4 showed marginal effects. The influence of the -163C>A polymorphism on CYP1A2 activity in smokers suggests an effect on the inducibility of the enzyme.

Place, publisher, year, edition, pages
2009. Vol. 10, no 5, 769-778 p.
Keyword [en]
age, caffeine, CYP1A2, gender, pharmacogenetics, polymorphisms, smoking
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-104136DOI: 10.2217/pgs.09.22ISI: 000267091700010PubMedID: 19450128OAI: oai:DiVA.org:uu-104136DiVA: diva2:219385
Available from: 2009-05-27 Created: 2009-05-27 Last updated: 2010-07-23Bibliographically approved

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