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The association between selected genetic variants and individual differences in experimental pain
Marie Udnesseter Lie1, Bendik Winsvold2, Johannes Gjerstad3,4
1FORMI-Oslo University Hospital, Oslo, Norway.
Scandinavian Journal of Pain
|October 27, 2020
Summary
Genetic variants in serotonin, catecholamine, and opioid pathways do not explain individual differences in experimental pain responses. This study found no significant associations in 356 participants, contributing to a better understanding of pain genetics.
Area of Science:
- Neuroscience
- Genetics
- Pain Research
Background:
- Individual differences in pain perception are significant but not fully understood.
- Genetic factors are hypothesized to contribute to pain susceptibility.
- Key neurotransmitter systems (serotonin, catecholamine, opioid) are implicated in pain modulation.
Purpose of the Study:
- To investigate the association between specific genetic variants and individual differences in experimental pain.
- To examine variants in serotonin transporter (SLC6A4 5-HTTLPR/rs25531 A>G), COMT (rs4680 Val158Met), and opioid receptor (OPRM1 rs1799971 A118G) genes.
- To determine if these genetic variants influence pain thresholds, tolerance, and modulation.
Main Methods:
- Genotyping of 356 participants (low back pain patients and healthy volunteers).
- Assessment of experimental pain using measures like heat/pressure pain thresholds, heat pain tolerance, conditioned pain modulation (CPM), offset analgesia, temporal summation, and secondary hyperalgesia.
- Statistical analysis using ANOVA and Kruskal-Wallis tests.
Main Results:
- No significant associations were found between the studied genetic variants (SLC6A4, COMT, OPRM1) and any of the experimental pain measures.
- Allelic frequencies and experimental pain results did not differ between patient and healthy volunteer groups, allowing combined analysis.
- This large sample size (356 subjects) provides robust evidence against the involvement of these specific variants in individual pain differences.
Conclusions:
- The investigated genetic variants, despite their known roles in pain pathways, do not explain individual variability in experimental pain responses.
- This study highlights the complexity of pain perception, suggesting other genetic or environmental factors may be more influential.
- The findings contribute valuable data to the field, particularly given the study's sample size and comprehensive pain assessments.
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