Summary
This multi-omics Mendelian randomization study integrates transcriptomics, epigenetics, and microbiota data to identify putative causal relationships between oxidative stress gene expression and Crohn's disease. Five blood genes (BAD, SHC1, STAT3, MUC1, GPX3) were prioritised as candidate causal factors, with evidence suggesting interactions between host oxidative stress gene regulation and gut microbiota composition. The findings support oxidative stress as a potential aetiological trigger rather than merely a consequence of intestinal inflammation.
Regional applicability
This study was conducted in China using primarily Chinese population data and validation. Whilst the underlying biological mechanisms of oxidative stress and microbiota-host interactions are likely conserved, the generalisability to United Kingdom populations depends on whether the identified genetic variants and their effect sizes are consistent across European ancestry groups, which would require replication studies in UK cohorts.
Key measures
Differentially expressed oxidative stress genes, expression quantitative trait loci (eQTLs), DNA methylation QTLs (mQTLs), fecal microbial QTLs (mbQTLs), genome-wide association study summary statistics for Crohn's disease risk
Outcomes reported
The study identified five blood-derived candidate causal genes (BAD, SHC1, STAT3, MUC1, GPX3) and putative intestinal genes associated with Crohn's disease risk through integration of genome-wide association, gene expression, DNA methylation, and microbial quantitative trait loci data. Results were validated in an independent multi-omics cohort from a Chinese hospital.
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