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Interaction of polymorphisms in the CARD15 and CD14 genes in patients with Crohn disease
1Abteilung für Humangenetik, Ruhr-Universität, Bochum, Germany. wolfram.klein@ruhr-uni-bochum.de
Insights
Genetic variations in CARD15 and CD14 genes interact, increasing Crohn disease (CD) risk. These gene interactions, crucial for lipopolysaccharide recognition, highlight a key factor in CD pathogenesis.
Area of Science:
- Genetics
- Immunology
- Gastroenterology
Background:
- Variations in the CARD15 gene are associated with Crohn disease (CD) but are not solely responsible for its genetic predisposition.
- Additional genetic and environmental factors are implicated in the complex pathogenesis of CD.
Purpose of the Study:
- To investigate potential interactions between the CARD15 and CD14 genes in the context of Crohn disease.
- To evaluate the role of a specific CD14 promoter polymorphism in conjunction with CARD15 variations in CD susceptibility.
Main Methods:
- Genotyping of 650 healthy controls and 253 CD patients for a CD14 promoter polymorphism (T/C at -159) using RFLP analysis.
- Genotyping of CD patients for known CARD15 gene variations (Arg702Trp, Gly908Arg, Leu1007fsinsC).
Main Results:
- The T allele and TT genotype of the CD14 promoter were significantly more frequent in CD patients carrying at least one CARD15 variation compared to controls (P = 0.02 and P = 0.0002).
- No significant association between CD14 promoter variations and CD was observed in patients lacking CARD15 variations.
Conclusions:
- Interactions between the CARD15 and CD14 genes, both involved in lipopolysaccharide recognition, contribute to an increased risk of developing Crohn disease.
- These gene-gene interactions represent a significant factor in the genetic susceptibility to Crohn disease.
Background:
Associations of variations in the CARD15 gene (Arg702Trp, Gly908Arg and Leu1007fsinsC) and Crohn disease (CD) have been shown recently. These variations are neither necessary nor sufficient for the genetic predisposition of CD. Further genetic and environmental factors play a crucial role in the pathogenesis of CD.
Methods:
To evaluate putative interactions between the CARD15 and CD14 genes in CD, a functionally relevant polymorphism in the promoter region (T/C at position -159) has been genotyped for 650 healthy controls and 253 patients with CD by RFLP analyses. CD patients were genotyped for the variations of the CARD15 gene.
Results:
T allele and TT genotype frequencies of the CD14 promoter were significantly increased only in CD patients with at least one variation in the CARD15 gene compared to controls (P = 0.02 and 0.0002, respectively). No significant association was found in CD patients without any of the variations.
Conclusion:
Interactions of the CARD15 and CD14 genes, both of which are involved in the recognition of lipopolysaccharides, increase the risk for developing CD.