NOD2 and desease associated variant NOD2-L1007fsinsC dependent genomewide transcriptional regulation in stable Flp-In HEK cells

NOD2 is an intracellular receptor for the bacterial cell wall component muramyl dipeptide (MDP) and variants of NOD2 are associated with chronic inflammatory diseases of barrier organs e.g. Crohn disease, asthma and atopic eczema. It is known that activation of NOD2 induces a variety of inflammatory and antibacterial factors. The exact transcriptomal signatures that define the cellular programs downstream of NOD2 activation and the influence of the Crohn-associated variant L1007fsinsC are yet to be defined. To describe the MDP-induced activation program, we analyzed the transcriptomal reactions of isogenic HEK293 cells expressing NOD2wt or NOD2L1007fsinsC to stimulation with MDP. Importantly, a clear loss-of-function could be observed in the cells carrying the Crohn-associated variant L1007fsinsC, while the NOD2wt cells showed differential regulation of growth factors, chemokines and several antagonists of NF-B, e.g. TNFAIP3 (A20) and IER3.

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Billmann-Born S, Till A, Arlt A, Lipinski S, Sina C, Latiano A, Annese V, Häsler R, Kerick M, Manke T, Seegert D, Hanidu A, Schäfer H, van Heel D, Li J, Schreiber S, Rosenstiel P