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Association of NOD2 leucine-rich repeat variants with susceptibility to Crohn's disease

Abstract

Crohn's disease1,2 and ulcerative colitis, the two main types of chronic inflammatory bowel disease, are multifactorial conditions of unknown aetiology. A susceptibility locus for Crohn's disease has been mapped3 to chromosome 16. Here we have used a positional-cloning strategy, based on linkage analysis followed by linkage disequilibrium mapping, to identify three independent associations for Crohn's disease: a frameshift variant and two missense variants of NOD2, encoding a member of the Apaf-1/Ced-4 superfamily of apoptosis regulators that is expressed in monocytes. These NOD2 variants alter the structure of either the leucine-rich repeat domain of the protein or the adjacent region. NOD2 activates nuclear factor NF-kB; this activating function is regulated by the carboxy-terminal leucine-rich repeat domain, which has an inhibitory role and also acts as an intracellular receptor for components of microbial pathogens. These observations suggest that the NOD2 gene product confers susceptibility to Crohn's disease by altering the recognition of these components and/or by over-activating NF-kB in monocytes, thus documenting a molecular model for the pathogenic mechanism of Crohn's disease that can now be further investigated.

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Figure 1: Strategy used to identify the IBD1 locus.
Figure 2: Representation of the IBD1/NOD2 protein variants.

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Acknowledgements

We acknowledge patients and their families, and thank family recruitment doctors: J. Balanzo, B. Bonaz, Y. Bouhnik, G. Cadiot, S. Cucchiara, B. Crusius, J. J. Delchier, B. Duclos, J. L. Dupas, J. P. Galmiche, J. P. Gendre, D. Golfain, C. Grännö, D. Heresbach, A. Lachaux, H. Lautraite, C. Lenaerts, E. Lerebours, V. Levy, R. Löfberg, H. Malchow, P. Marteau, A. Morali, F. Pallone, S. Pena, A. Rotenberg, I. Rousseau, J. Schmitz, F. Shanahan, I. Sobhani, H. Svensson, A. Van Gossum, M. Van Winckel and M. Veyrac. For assistance we are grateful to J. C. Beaudoin, F. Chareyre, C. Giudicelli, T. Hung Bui, M. Legrand, A. Marcadet, A. Martins. C. de Toma, E. Tubacher. We thank H. Cann for critically reading the manuscript. This project received support from European Community, MENRT, INSERM, Direction Générale de la Santé, Association François Aupetit, IRMAD and the Swedish Society of Medicine.

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Correspondence to Gilles Thomas.

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Hugot, JP., Chamaillard, M., Zouali, H. et al. Association of NOD2 leucine-rich repeat variants with susceptibility to Crohn's disease. Nature 411, 599–603 (2001). https://doi.org/10.1038/35079107

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