The dopamine receptor D2 (DRD2) SNP rs1076560 is associated with opioid addiction

Toni-Kim Clarke, Amy R D Weiss, Thomas N Ferarro, Kyle M Kampman, Charles A Dackis, Helen M Pettinati, Charles P O'brien, David W Oslin, Falk W Lohoff, Wade H Berrettini

Research output: Contribution to journalArticlepeer-review

Abstract

The risk for drug addiction is partially heritable. Genes of the dopamine system are likely candidates to harbour risk variants, as dopamine neurotransmission is involved in mediating the rewarding effects of drugs of abuse. One functional single nucleotide polymorphism in dopamine receptor D2 (DRD2), rs1076560, is involved in regulating splicing of the gene and alters the ratio of DRD2 isoforms located pre- and postsynaptically. rs1076560 has been previously associated with cocaine abuse and we set out to confirm this association in a sample of European American (EA) (n = 336) and African American (AA) (n = 1034) cocaine addicts and EA (n = 656) and AA (n = 668) controls. We also analysed the role of rs1076560 in opioid dependence by genotyping EA (n = 1041) and AA (n = 284) opioid addicts. rs1076560 was found to be nominally associated with opioid dependence in EAs (p = 0.02, OR = 1.27) and AAs (p = 0.03, OR = 1.43). When both opioid-addicted ancestral samples were combined, rs1076560 was significantly associated with increased risk for drug dependence (p = 0.0038, OR = 1.29). This association remained significant after correction for multiple testing. No association was found with cocaine dependence. These data demonstrate the importance of dopamine gene variants in the risk for opioid dependence and highlight a functional polymorphism that warrants further study.

Original languageEnglish
Pages (from-to)33-9
Number of pages7
JournalAnnals of human genetics
Volume78
Issue number1
DOIs
Publication statusPublished - Jan 2014

Keywords

  • African Americans
  • Alleles
  • Case-Control Studies
  • Cocaine-Related Disorders
  • European Continental Ancestry Group
  • Female
  • Gene Frequency
  • Genotype
  • Humans
  • Linkage Disequilibrium
  • Male
  • Opioid-Related Disorders
  • Polymorphism, Single Nucleotide
  • Receptors, Dopamine D2
  • Risk Factors

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