Which mitochondrial genes may drive IBD risk?

Open paper intelligence

Integrating methylation, expression, and protein QTLs via MR/colocalization flags PARK7 and ACADM as tier-1 mitochondrial genes for IBD/UC, with protective protein-level odds ratios.

Source

Multi-omic insight into the molecular networks of mitochondrial dysfunction in the pathogenesis of inflammatory bowel disease

Chen J, Ruan X, Sun Y, et al. · EBioMedicine · 2024

doi.org/10.1016/j.ebiom.2023.104934 Read the full paper ↗120 citationscc by

Study at a glance

Design: Computational / modelling — Multi-omics Mendelian randomization + colocalization of mitochondrial QTLs vs IBD
N: N=2 · Two tier-1 mitochondrial genes (PARK7, ACADM); discovery IBDGC with UKB/FinnGen replication
Population: Genetic instruments from mQTL/eQTL/pQTL studies vs IBD/UC/CD GWAS
Outcome: Putative causal mitochondrial gene–IBD associations across omics layers

Structured fields used in claim comparison tables when every cited study has a complete layer.

What they did

Used summary-data MR on mitochondrial gene methylation, expression, and protein QTLs against IBDGC (discovery) plus UK Biobank and FinnGen (replication), with colocalization to test shared causal variants.

What they found

PARK7 and ACADM had tier-1 multi-omic support for IBD/UC; PDK1 and FIS1 had weaker UC tiers. Higher genetically predicted PARK7 (OR 0.36) and HINT1 (OR 0.47) associated with lower IBD risk; higher HINT1 with lower CD (OR 0.26); higher ACADM/PDK1/FIS1 with lower UC.

The limits

What it doesn't show

MR associations are not clinical proof that modulating these proteins treats IBD; horizontal pleiotropy and cohort differences remain risks.

Key terms

Mendelian randomization: Uses genetic variants as instruments to infer causal effects.
Colocalization: Tests whether two traits share the same causal variant.
mQTL/eQTL/pQTL: Loci affecting methylation, expression, or protein levels.
PARK7: Mitochondrial-related gene with tier-1 IBD evidence here.
ACADM: Fatty-acid oxidation gene linked to UC across omics.

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Tier-1 genes highlighted were:

Common questions

Tier-1 genes?

PARK7 and ACADM.

PARK7 protein OR for IBD?

0.36 (95% CI 0.25–0.52).

Methods?

MR + colocalization across m/e/pQTLs.

Replication GWAS?

UK Biobank and FinnGen.