Abstract
Inflammatory bowel disease (IBD) is a chronic disorder caused by multiple factors in a genetically susceptible host. Significant advances in the study of genetic susceptibility have highlighted the importance of the innate immune system in this disease. We previously completed a genome-wide linkage study and found a significant locus (IBD6) on chromosome 19p. We were interested in identifying the causal variant in IBD6. We performed a two-stage association mapping study. In stage 1, 1530 single-nucleotide polymorphisms (SNPs) were selected from the HapMap database and genotyped in 761 patients with IBD. Among the SNPs that passed the threshold for replication, 26 were successfully genotyped in 754 additional patients (stage 2). One intronic variant, rs273506, located in the microtubule-associated serine/threonine-protein kinase gene-3 (MAST3), was found to be associated in both stages (pooled P=1.8 × 10−4). We identified four MAST3 coding variants, including a non-synonymous SNP rs8108738, correlated to rs273506 and associated with IBD. To test whether MAST3 was expressed in cells of interest, we performed expression assays, which showed abundant expression of MAST3 in antigen-presenting cells and in lymphocytes. The knockdown of MAST3 specifically decreased Toll-like receptor-4-dependent NF-κB activity. Our findings are additional proofs of the pivotal role played by modulators of NF-κB activity in IBD pathogenesis.
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Acknowledgements
This project was funded by grants from the National Institute of Diabetes and Digestive and Kidney Diseases DK062432 to JDR and AI062773 to RJX. The Broad Institute Center for Genotyping and Analysis is supported by Grant U54 RR020278 from the National Center for Research Resources. C Labbé is the recipient of a Fond de Recherche en Santé du Québec studentship award. We thank Marcia Budarf, Marie-Pierre Lévesque and Jing Lian for their help in the review of the paper.
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Supplementary Information accompanies the paper on Genes and Immunity website (http://www.nature.com/gene)
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Labbé, C., Goyette, P., Lefebvre, C. et al. MAST3: a novel IBD risk factor that modulates TLR4 signaling. Genes Immun 9, 602–612 (2008). https://doi.org/10.1038/gene.2008.57
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DOI: https://doi.org/10.1038/gene.2008.57
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