The association between the OPRM1 A118G polymorphism and addiction in a Turkish population

  • Hülya Türkan Bozok University, Department of Anesthesiology and Reanimation, Yozgat
  • Bensu Karahalil Gazi University, Faculty of Pharmacy Department of Toxicology, Ankara
  • Ela Kadıoğlu Gazi University, Faculty of Pharmacy Department of Toxicology, Ankara
  • Kenan Eren Alcohol and Substance Addiction Treatment and Research Center, Bakirköy State Hospital for Mental and Neurological Diseases, İstanbul
  • Defne Tamar Gürol Alcohol and Substance Addiction Treatment and Research Center, Bakirköy State Hospital for Mental and Neurological Diseases, İstanbul
  • Ali Esat Karakaya Gazi University, Faculty of Pharmacy Department of Toxicology, Ankara
Keywords: alcohol, cannabis, cocaine, ecstasy, hypnotic substances, LSD, opioid, psychiatric disorders, rs1799971, sedatives, μ-opioid receptor


Susceptibility to addiction has a complex genetic basis that includes genes associated with the action and metabolism of drugs of abuse. One important gene in that respect is OPRM1, which codes for the μ-opioid receptor and has an important role in mediating the rewarding effects of addiction substances. The aim of our study was to assess the prevalence of the OPRM1 A118G polymorphism (rs1799971) in Turkish population and to investigate its association with opioid and other substance addiction. In addition, we examined the association of rs1799971 in addicted patients who were also diagnosed with psychiatric disorders. The study included 103 patients addicted to opioids, cocaine, ecstasy, alcohol, lysergic acid diethylamide (LSD), cannabis, and sedative/hypnotic substances and 83 healthy volunteers with similar demographic features as controls. rs1799971 polymorphisms were identified with the polymerase chain reaction restriction fragment length polymorphism method (PCR-RFLP). The genotype frequencies were significantly higher in the addicted patients than controls (32.0 % vs 16.9 %, respectively; p=0.027). The prevalence of the G allele was 16.1 % in the addicted group and 8.4 % in the control group (p=0.031). Our study confirmed the association between the rs1799971(G) allele frequency and opioid and other substance addiction, but not with psychiatric disorders.


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How to Cite
Türkan H, Karahalil B, Kadıoğlu E, Eren K, Gürol DT, Karakaya AE. The association between the OPRM1 A118G polymorphism and addiction in a Turkish population. AIHT [Internet]. 19Apr.2019 [cited 18Jun.2019];70(2). Available from:
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