Abstract
Background
Genetic and functional studies have associated variants in the NOD2/CARD15 gene with Crohn’s disease.
Aims
This study aims to replicate the association of three common NOD2 mutations with Crohn’s disease, study its effect on NOD2 expression in B cells and its interaction with other IBD-associated genes.
Methods
A total of 294 IBD patients (179 familial IBD, 115 sporadic IBD) and 298 unrelated healthy controls were from central Pennsylvania. NOD2 mutations were analyzed by primer-specific amplification, PCR based-RFLP, and validated with the ABI SNPlexM genotyping system. Gene–gene interaction was studied using a statistical model for epistasis analysis.
Results
Three common NOD2 mutations are associated with Crohn’s disease (p = 5.08 × 10−7, 1.67 × 10−6, and 1.87 × 10−2 for 1007fs, R720W, and G908R, respectively), but not with ulcerative colitis (p = 0.1046, 0.1269, and 0.8929, respectively). For IBD overall, 1007finsC (p = 4.4 × 10−5) and R720W (p = 9.24 × 10−5) were associated with IBD, but not G908R (p = 0.1198). We revealed significant interactions of NOD2 with other IBD susceptibility genes IL23R, DLG5, and OCTN1. We discovered that NOD2 was expressed in both normal human peripheral blood B cells and in EBV-transformed B cell lines. Moreover, we further demonstrated that muramyl dipeptide (MDP) stimulation of B lymphocytes up-regulated expression of NF-κB-p50 mRNA.
Conclusion
NOD2 is expressed in peripheral B cells, and the up-regulation of NOD2 expression by MDP was significantly impaired by NOD2 mutations. The finding suggests a possible role of NOD2 in the immunological response in IBD pathogenesis.
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Acknowledgments
The authors thank Tony Lin for his assistant with RFLP genotyping. This work is supported by a grant from the Philadelphia Health Care Trust (to W.A Koltun) and a Surgery Initiation Grant from Pennsylvania State University College of Medicine (to Z. Lin).
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Zhenwu Lin, John P. Hegarty and Gerrit John equally contributed to this article.
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Lin, Z., Hegarty, J.P., John, G. et al. NOD2 Mutations Affect Muramyl Dipeptide Stimulation of Human B Lymphocytes and Interact with Other IBD-Associated Genes. Dig Dis Sci 58, 2599–2607 (2013). https://doi.org/10.1007/s10620-013-2696-8
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DOI: https://doi.org/10.1007/s10620-013-2696-8