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Published on: October 10, 2025
Pain perception is altered by a nucleotide polymorphism in SCN9A
Frank Reimann1, James J Cox, Inna Belfer
1Department of Clinical Biochemistry, Cambridge Institute for Medical Research, Addenbrooke's Hospital, Cambridge CB2 0XY, United Kingdom.
Summary
Single nucleotide polymorphisms (SNPs) in the SCN9A gene influence pain perception. The SCN9A rs6746030 A allele is linked to increased pain sensitivity across various conditions.
Area of Science:
- Genetics
- Neuroscience
- Pain Research
Background:
- The SCN9A gene encodes the Nav1.7 sodium channel, crucial for pain signaling.
- Mutations in SCN9A cause extreme pain disorders or complete pain absence.
- Investigating SCN9A single nucleotide polymorphisms (SNPs) may reveal genetic influences on general pain perception.
Purpose of the Study:
- To determine if SCN9A SNPs are associated with varying pain perception in the general population.
- To explore the functional consequences of identified SCN9A variants on Nav1.7 channel activity.
Main Methods:
- Genotyping of 27 SCN9A SNPs in 578 osteoarthritis patients.
- Association analysis of SNP rs6746030 with pain scores in five cohorts (1277 individuals total).
- Electrophysiological assessment of rs6746030 alleles in HEK293 cells; genotyping in healthy females responding to noxious stimuli.
Main Results:
- SNP rs6746030 showed a significant association with pain scores (P=0.016 in osteoarthritis).
- The rarer A allele of rs6746030 was linked to higher pain scores across all tested cohorts (combined P=0.0001).
- rs6746030 alleles differentially affected Nav1.7 channel inactivation, with the A allele predicted to increase activity; A allele associated with altered pain threshold in healthy females.
Conclusions:
- SCN9A genotype, specifically rs6746030, influences individual pain perception.
- The rs6746030 A allele may increase pain sensitivity through enhanced Nav1.7 channel function.
- Genetic variations in SCN9A contribute to the spectrum of human pain experience.
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