Association of Polymorphisms in the Melanocortin Receptor Type 2 (MC2R, ACTH Receptor) Gene with Heroin Addiction

Overview

Journal Neurosci Lett

Specialty Neurology

Date 2008 Mar 25

PMID 18359160

Citations 22

Authors

Dmitri Proudnikov

Sara Hamon

Jurg Ott

Mary Jeanne Kreek

Affiliations

Soon will be listed here.

Abstract

The melanocortin receptor type 2 (MC2R or adrenocorticotropic hormone, ACTH receptor) gene (MC2R) encodes a protein involved in regulation of adrenal cortisol secretion, important in the physiological response to stressors. A variant of MC2R, -179A>G, results in reduction of promoter activity and less adrenal action. We hypothesize that altered stress responsivity plays a key role in the initiation of substance abuse. By direct resequencing of the promoter region and exons 1 and 2 of the MC2R gene in 272 subjects including Caucasians, Hispanics and African Americans with approximately equal numbers of former heroin addicts and normal volunteers, we identified five novel variants each with allele frequency <2%. Previously reported polymorphisms -184G>A (rs2186944), -179A>G, 833A>C (rs28926182), 952T>C (rs4797825), 1005C>T (rs4797824) and 1579T>C (rs4308014) were each in allelic frequency >/=2% in one or more ethnic groups. These polymorphisms were genotyped in 632 subjects (260 Caucasians, 168 Hispanics, 183 African Americans and 21 Asians) using TaqMan assays. Significant differences in genotype frequency among ethnic groups studied were found for each of the six variants analyzed. We found a significant association (p=0.0004, experiment-wise p=0.0072) of the allele -184A with a protective effect from heroin addiction in Hispanics. Also, in Hispanics only we found the haplotype GACT consisting of four variants (-184G>A, -179A>G, 833A>C and 1005C>T) to be significantly associated with heroin addiction (p=0.0014, experiment-wise p=0.0168), whereas another haplotype, AACT, consisting of the same variants, was associated with a protective effect from heroin addiction (p=0.0039, experiment-wise p=0.0468).

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