Alterations in expression of a cannabinoid receptor (CNR1, CB1), and of fatty acid amide hydrolase (FAAH) that degrades endogenous ligands of CB1, may contribute to the development of addiction. The 385C>A in the FAAH gene and six polymorphisms of CNR1 were genotyped in former heroin addicts and control subjects (247 Caucasians, 161 Hispanics, 179 African Americans and 19 Asians). In Caucasians, long repeats (>or=14) of 18087-18131(TAA)(8-17) were associated with heroin addiction (P=0.0102). Across three ethnicities combined, a highly significant association of long repeats with heroin addiction was found (z=3.322, P=0.0009). Point-wise significant associations of allele 1359A (P=0.006) and genotype 1359AA (P=0.034) with protection from heroin addiction were found in Caucasians. Also in Caucasians, the genotype pattern, 1359G>A and -6274A>T, was significantly associated with heroin addiction experiment wise (P=0.0244). No association of FAAH 385C>A with heroin addiction was found in any group studied.
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| http://dx.doi.org/10.1038/tpj.2009.59 | DOI Listing |
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