Abstract
Coffee is the most commonly used stimulant and caffeine is its main psychoactive ingredient. The heritability of coffee consumption has been estimated at around 50%. We performed a meta-analysis of four genome-wide association studies of coffee consumption among coffee drinkers from Iceland (n = 2680), the Netherlands (n = 2791), the Sorbs Slavonic population isolate in Germany (n = 771) and the USA (n = 369) using both directly genotyped and imputed single nucleotide polymorphisms (SNPs) (2.5 million SNPs). SNPs at the two most significant loci were also genotyped in a sample set from Iceland (n = 2430) and a Danish sample set consisting of pregnant women (n = 1620). Combining all data, two sequence variants significantly associated with increased coffee consumption: rs2472297-T located between CYP1A1 and CYP1A2 at 15q24 (P = 5.4. 10-14) and rs6968865-T near aryl hydrocarbon receptor (AHR) at 7p21 (P = 2.3. 10-11). An effect of ~0.2 cups a day per allele was observed for both SNPs. CYP1A2 is the main caffeine metabolizing enzyme and is also involved in drug metabolism. AHR detects xenobiotics, such as polycyclic aryl hydrocarbons found in roasted coffee, and induces transcription of CYP1A1 and CYP1A2. The association of these SNPs with coffee consumption was present in both smokers and nonsmokers.
| Original language | English |
|---|---|
| Article number | ddr086 |
| Pages (from-to) | 2071-2077 |
| Number of pages | 7 |
| Journal | Human molecular genetics |
| Volume | 20 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - May 2011 |
Bibliographical note
Funding Information: This work was supported in part by grants from the NIH (R01-DA017932) and the European Commission (LSHM-CT-2004 – 005166). Dr Knut Krohn, Microarray Core Facility of the Interdisciplinary Centre for Clinical Research, University of Leipzig, Germany; German Research Council KFO-152 (to M.S.); IZKF B27 (to M.S., P.K. and A.T.). The research of Inga Prokopenko and Reedik Mägi is funded in part through the European Community’s Seventh Framework Programme (FP7/2007 – 2013), ENGAGE project, grant agreement HEALTH-F4-2007-201413.Fingerprint
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