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Ulcerative Colitis Is Under Dual (Mitochondrial and Nuclear) Genetic Control
Alexandra Rosa1, Patrícia Abrantes, Inês Sousa
1*Unidade de Ciências Médicas, Centro de Competências das Ciências da Vida, Universidade da Madeira, Funchal, Portugal; †Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal; ‡Instituto Gulbenkian de Ciência, Oeiras, Portugal; and §Centre for Biomedical Research (CBMR), Universidade do Algarve, Faro, Portugal.
Mitochondrial DNA (mtDNA) variations, specifically the A10550G variant, significantly increase ulcerative colitis (UC) risk. This study reveals dual genetic control of UC involving both nuclear and mitochondrial genomes.
Area of Science:
- Genetics
- Mitochondrial Biology
- Gastroenterology
Background:
- Ulcerative colitis (UC) etiology involves oxidative stress and genetic factors.
- Nuclear genome associations with UC are well-studied, but mitochondrial DNA (mtDNA) contributions remain underexplored.
- mtDNA may explain a portion of UC's heritability.
Purpose of the Study:
- To comprehensively analyze the role of mitochondrial DNA (mtDNA) in UC susceptibility.
- To investigate associations between mitochondrial single-nucleotide polymorphisms (mtSNPs) and UC risk.
Main Methods:
- Tested mtSNPs and haplogroups for UC association in 488 UC cases and 833 controls of European ancestry.
- Utilized data from the NIDDK IBD Genetics Consortium Ulcerative Colitis Genome-Wide Association Study and Illumina Genotype Control Database.
- Employed ancestry informative markers to rule out population stratification.
Main Results:
- The mtSNP A10550G in MT-ND4L was strongly associated with UC risk (P = 1.29E-06, OR = 4.80), independent of nuclear GWAS loci.
- Additive epistatic interactions were observed between A10550G and top UC GWAS hits.
- Mitochondrial haplogroup K1 increased UC risk (P = 0.021), while U5b conferred protection (P = 0.016).
Conclusions:
- UC susceptibility is influenced by both nuclear and mitochondrial genetic factors.
- The findings highlight the complexity of UC's genetic underpinnings.
- Further replication in independent datasets is recommended to validate these results.
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Inflammatory Bowel Disease I: Ulcerative Colitis
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...