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Twin studies of pain
C S Nielsen1, G P Knudsen, Ó A Steingrímsdóttir
1Norwegian Institute of Public Health, Division of Mental Health, Oslo, Norway. chsn@fhi.no
Clinical Genetics
|July 25, 2012
Summary
Twin studies reveal moderate heritability for common pain conditions like migraine (around 50%). However, inconsistent definitions and methods in past research limit understanding of pain genetics.
Area of Science:
- Behavioral and Social Sciences
- Genetics
- Neuroscience
Background:
- Twin studies are crucial for dissecting the genetic and environmental influences on various phenotypes.
- Understanding the heritability of pain is essential for elucidating its underlying mechanisms and developing targeted treatments.
Purpose of the Study:
- To systematically review existing twin studies on both clinical and experimental pain phenotypes.
- To estimate the heritability of different pain conditions and explore genetic relationships between them.
Main Methods:
- Conducted a systematic literature review, including 56 twin studies.
- Analyzed studies focusing on clinical pain phenotypes (52 papers) and experimental pain modalities.
- Assessed heritability estimates and genetic correlations based on reported data.
Main Results:
- Heritability estimates for clinical pain include ~50% for migraine, tension-type headache, and chronic widespread pain; ~35% for back/neck pain; and ~25% for irritable bowel syndrome.
- Significant heterogeneity in phenotype definitions and reliance on dichotomous outcomes in clinical studies introduce uncertainty.
- Experimental pain studies suggest distinct genetic factors for different pain modalities, contrasting with potential common genetic risk across clinical pain conditions.
Conclusions:
- While twin studies suggest a genetic component to various pain conditions, methodological limitations, particularly in phenotyping, necessitate caution in interpreting results.
- Future research should prioritize continuous pain intensity measures, detailed phenotyping, and investigation of genetic links between clinical and experimental pain.
- Prioritizing studies that examine genetic relationships across diverse pain phenotypes is crucial for advancing our understanding of pain mechanisms.
