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Genetic susceptibility in IBD: overlap between ulcerative colitis and Crohn's disease.
- Source :
-
Inflammatory bowel diseases [Inflamm Bowel Dis] 2013 Feb; Vol. 19 (2), pp. 240-5. - Publication Year :
- 2013
-
Abstract
- Background: The etiology of ulcerative colitis (UC) and Crohn's disease (CD) involves both genetic and environmental components. Multiple UC and CD susceptibility genes have been identified through genome-wide association studies and subsequent meta-analyses. These studies have also highlighted the presence of genes common to both diseases, and shared with several other autoimmune disorders. The aim of this study was to identify single nucleotide polymorphisms (SNPs) recently identified by the International IBD Genetics Consortium (IIBDGC) demonstrating that highly significant associations with CD could also confer genetic susceptibility to UC.<br />Methods: Statistical modeling was performed on 29 CD-associated SNPs. The study comprised of 1652 UC cases from the Australia and New Zealand IBD Consortium and 2363 Australian population-based controls.<br />Results: After adjustment for multiple comparisons, only one SNP, rs3024505, was significantly associated with UC (P = 0.001). Independent chi-square analyses identified odds ratios of 2.22 (1.48-3.37) for the rare homozygous genotype, and 1.20 (1.06-1.35) for the minor allele. Five other SNPs demonstrated moderate to weak associations with UC.<br />Conclusions: Of the 29 SNPs conferring high genetic susceptibility to CD, 28 were not associated with UC, thus indicating that for this SNP set there is a low level of overlap between the two major forms of IBD. Only one SNP, rs3024505 (Chr 1q32.1, upstream of IL10), was associated with susceptibility to UC. The identification of this SNP replicates a finding from Franke et al (2008), where the rs3024505 SNP was strongly associated with UC across multiple European populations.
- Subjects :
- Australia
Case-Control Studies
Chi-Square Distribution
Genetic Association Studies
Genetic Markers
Humans
Interleukin-10 genetics
Linear Models
Multivariate Analysis
New Zealand
Odds Ratio
Colitis, Ulcerative genetics
Crohn Disease genetics
Genetic Predisposition to Disease
Polymorphism, Single Nucleotide
Subjects
Details
- Language :
- English
- ISSN :
- 1536-4844
- Volume :
- 19
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Inflammatory bowel diseases
- Publication Type :
- Academic Journal
- Accession number :
- 23348120
- Full Text :
- https://doi.org/10.1097/MIB.0b013e3182810041