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Genotype-phenotype correlations: how many disorders constitute inflammatory bowel disease?
Christoph Gasche1, Behrooz Z Alizadeh, A Salvador Peña
1Department of Medicine 4, Division of Gastroenterology and Hepatology, University of Vienna, Austria. christoph.gasche@akh-wien.ac.at
European Journal of Gastroenterology & Hepatology
|July 4, 2003
Summary
Certain mutations in the CARD15/NOD2 gene are linked to specific Crohn's disease phenotypes, particularly early-onset ileal and fibrostenotic disease. Other genetic variations may modify disease progression rather than cause initial susceptibility.
Area of Science:
- Genetics
- Gastroenterology
- Immunology
Background:
- Inflammatory bowel diseases (IBD), including Crohn's disease and ulcerative colitis, are influenced by multiple chromosomal loci.
- The IBD1 locus has been identified as CARD15/NOD2, with specific loss-of-function mutations associated with Crohn's disease development.
Purpose of the Study:
- To review current association data linking CARD15/NOD2 mutations to specific Crohn's disease phenotypes.
- To discuss the role of other genetic variations, such as those in HLA and cytokine genes, in IBD.
Main Methods:
- Review of association studies on CARD15/NOD2 mutations and Crohn's disease phenotypes.
- Analysis of data concerning variations in HLA and cytokine genes in IBD patients.
Main Results:
- CARD15/NOD2 mutations are associated with early-onset ileal and fibrostenotic Crohn's disease (Vienna classification subgroups A1/L1 or L3/B2).
- Variations in HLA and cytokine genes appear to be disease-modifying rather than disease-predisposing factors.
Conclusions:
- The genetic landscape of IBD is complex, involving multiple genes and environmental factors.
- Predicting the exact number of causative genes, mutations, or environmental influences for IBD remains challenging.