The multi-generational familial aggregation of interstitial cystitis, other chronic nociplastic pain disorders, depression, and panic disorder. — CFSMEATLAS
The multi-generational familial aggregation of interstitial cystitis, other chronic nociplastic pain disorders, depression, and panic disorder.
Allen-Brady, Kristina, Fyer, Abby J, Weissman, Myrna · Psychological medicine · 2023 · DOI
Quick Summary
This study found that interstitial cystitis (a chronic bladder pain condition) and several other conditions—including ME/CFS, fibromyalgia, irritable bowel syndrome, depression, and panic disorder—tend to run in families. Researchers looked at medical records and family trees of over a century of people in Utah to see if relatives of patients with these conditions had higher rates of the same or related conditions. They discovered that these six conditions share something in common genetically, meaning a family history of any one of them may increase the risk of developing others.
Why It Matters
This study provides evidence that ME/CFS shares a common genetic or heritable basis with other pain conditions and psychiatric disorders, which may explain why ME/CFS patients so often experience multiple overlapping conditions. Understanding these shared biological pathways could lead to improved screening, prevention strategies, and treatments targeting the underlying mechanisms rather than individual symptoms. For patients, it validates that these co-occurring conditions are interconnected at a biological level, not simply coincidental.
Observed Findings
26 of 30 possible bidirectional disorder interrelationships showed significant increased relative risk among first-degree relatives of all six proband groups.
23 of 30 interrelationships remained significant among second-degree relatives.
Only 7 of 30 interrelationships were statistically significant among third-degree relatives.
Clustering of these six disorders was observed in both close and distant relatives.
Relatives of probands without the specific diagnosis being assessed still showed significantly elevated risk for multiple conditions.
Inferred Conclusions
A common heritable component underlies interstitial cystitis, fibromyalgia, IBS, ME/CFS, major depressive disorder, and panic disorder.
These conditions should be understood as part of a related clinical spectrum rather than completely distinct entities.
Genetic susceptibility is a shared risk factor across nociplastic pain disorders and certain psychiatric conditions.
The heritability signal weakens but persists across generations, suggesting both heritable and non-heritable factors contribute to disease expression.
Remaining Questions
What are the specific genetic variants or biological pathways shared across these six conditions?
What This Study Does Not Prove
This study does not identify the specific genes or biological mechanisms responsible for these shared heritable factors. It cannot prove that genetics alone causes these conditions—environmental factors, gene-environment interactions, and other unmeasured variables likely play important roles. The study also cannot explain why some relatives develop these conditions while others with the same family history do not.
What role do environmental triggers and epigenetic factors play in determining which relatives with genetic susceptibility actually develop these conditions?
Can these findings be replicated in populations outside Utah, and do the patterns hold across different ethnic and socioeconomic groups?
Which clinical features, if any, could help predict which family members are at highest risk, and could early intervention prevent disease development?