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Journal of Oral & Facial Pain and Headache
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J Orofac Pain 32 (2018), No. 4     6. Nov. 2018
J Orofac Pain 32 (2018), No. 4  (06.11.2018)

Page 367-374


Genetic Variations of OPRM1, OPRK1, and COMT Genes and Their Possible Associations with Oral Pain in a Population from Argentina
Raggio, María Celeste / González, Rebeca / Hohl, Diana María / Glesmann, Laura Angela / Catanesi, Cecilia Inés
Aims: To analyze in a population from Argentina the variation of three genes involved in the control of pain pathways-two genes that code for opioid receptors (OPRM1 and OPRK1) and COMT, which codes for an important enzyme in the control of neurotransmission-and to evaluate the associations of these genes with oral pain and the need for analgesics in the population under study.
Methods: A total of 134 volunteer donors from the city of Resistencia and 27 donors from the Wichí community for comparison were analyzed for 13 single nucelotide polymorphisms (SNPs) and 1 insertion/deletion (Indel) localized in the three genes using polymerase chain reaction-restriction fragment length polymorphism or standard PCR and electrophoresis. All 134 individuals from Resistencia provided biologic samples for DNA analysis, and a subset (n = 81) agreed to answer a questionnaire for an association analysis. Statistical tests for a possible association between genetic variation and self-reported ethnic origin, oral pain, and need for analgesic drugs were performed.
Results: Significant differences were found when the study population was compared to populations from other continents, as well as between the two studied populations (P < .05). A positive association was suggested for the COMT gene from Resistencia with both oral pain intensity and analgesic requirements.
Conclusion: The admixture process that occurred in the past of Resistencia probably contributed to a genetic differentiation in this population, and this genetic variation might influence phenotypic expressions of pain perception and analgesic requirements.

Keywords: admixed population, pain genetics, pain perception, single nucleotide polymorphisms