E2 ModeratePreliminaryPEM not requiredCase-ControlPeer-reviewedReviewed
Standard · 3 min
Irritable bowel syndrome may be associated with maternal inheritance and mitochondrial DNA control region sequence variants.
van Tilburg, Miranda A L, Zaki, Essam A, Venkatesan, Thangam et al. · Digestive diseases and sciences · 2014 · DOI
Quick Summary
This study looked at whether irritable bowel syndrome (IBS) runs in families through the mother's side, and whether this pattern is linked to variations in mitochondrial DNA (the energy-producing structures in our cells). Researchers found that about 1 in 6 IBS patients had a family history suggesting maternal inheritance, and certain DNA variations were more common in these patients. This suggests that mitochondrial dysfunction may explain IBS symptoms in some people.
Why It Matters
This finding is relevant to ME/CFS because mitochondrial dysfunction has been implicated in multiple comorbid functional disorders including chronic fatigue syndrome, and some ME/CFS patients also experience IBS-like symptoms. Identifying a mitochondrial subgroup within IBS could improve understanding of overlapping pathophysiology between these conditions and inform targeted treatment strategies. The study suggests that genetic factors affecting cellular energy production may contribute to multiple functional disorders co-occurring in patients.
Observed Findings
17.5% of IBS patients showed probable maternal inheritance pattern, compared to 2% of healthy controls and 0% of IBD controls (p < 0.0001).
The 16519T mtDNA polymorphism was significantly more common in IBS patients with maternal inheritance than in controls (OR 5.8; 95% CI 1.5-23.1).
No significant difference was found between IBS and control groups for the 3010A polymorphism.
IBS patients with maternal inheritance were significantly more likely to carry 16519T than IBS patients without maternal inheritance (OR 5.2; 95% CI 1.2-22.6).
Inferred Conclusions
A significant minority of IBS patients (approximately 1 in 6) have pedigrees suggestive of maternal inheritance, indicating a potential genetic component to IBS in this subgroup.
The 16519T mtDNA polymorphism, previously implicated in other functional disorders, is associated with IBS displaying maternal inheritance patterns.
Mitochondrial DNA-related mitochondrial dysfunction may constitute a distinct biological subgroup within the broader IBS population.
Remaining Questions
Does the 16519T variant actually cause functional mitochondrial impairment, or is it a marker of other causative variants?
How do findings in Caucasian populations apply to other ethnic groups, and are there population-specific mtDNA variants in IBS?
What This Study Does Not Prove
This pilot study does not prove that mitochondrial DNA variants cause IBS—it only shows an association in a small sample. The findings are not generalizable beyond Caucasian populations, and maternal inheritance patterns in pedigrees are suggestive but not definitive proof of mitochondrial disease. Replication in larger, more diverse populations is required before drawing causal conclusions.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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