Pain reporting at different body sites is explained by a single underlying genetic factor

Area of Science:

• Genetics
• Pain Research
• Epidemiology

Background:

• Musculoskeletal pain is a common complaint, but the reasons for reporting pain in specific areas are not fully understood.
• It remains unclear whether pain reflects localized pathology or a general tendency to experience pain.

Purpose of the Study:

• To investigate the heritability of pain reporting across different body sites using a twin study.
• To determine if a common underlying genetic factor influences the propensity to report musculoskeletal pain.

Main Methods:

• A classical twin design was employed with a sample of female twins from the TwinsUK cohort.
• Participants completed a questionnaire on pain experience in various body regions (neck, back, elbow, knee, thigh, hands, feet).
• Univariate and multivariate genetic analyses were used to assess the genetic contribution to pain reporting.

Main Results:

• Pain prevalence varied from 17% to 46% across anatomical sites.
• Heritability estimates for pain reporting at individual sites ranged from 28% to 71%.
• A single underlying factor explained 95% of the variance in pain reporting, with a heritability of 46% (95% CI 40-52%).

Conclusions:

• A shared genetic factor influences the propensity to report pain across different musculoskeletal sites.
• This contrasts with osteoarthritis, where genetic factors are site-specific.
• Findings may guide the development of therapeutic targets for pain in chronic degenerative conditions.