Association of OPRK1 rs963549 and rs997917 polymorphisms with opioid use disorder and related phenotypes

To evaluate the association between rs963549 and rs997917 and opioid use disorder (OUD) and related phenotypes. A sample of 208 individuals with (n = 100) and without (n = 108) OUD were enrolled. rs963549 and rs997917 were analyzed by PCR-RFLP. Craving, opioid withdrawal and the intensity of depressive and anxiety symptoms were measured by the appropriate scales. rs963549 variation showed a trend of association with decreased opioid withdrawal. No significant associations were found between rs963549 and rs997917 polymorphisms and craving, depression or anxiety symptoms. Neither single SNPs nor haplotypes were associated with OUD. Our results could be useful for treatment failures of individuals who experience greater opioid withdrawal due to their rs963549 genotypes.