Novel NOD2 Mutation in Early-Onset Inflammatory Bowel Phenotype

Martina Girardelli, Claudia Loganes, Alessia Pin, Elisabetta Stacul, Eva Decleva, Diego Vozzi, Gabriele Baj, Costantino De Giacomo, Alberto Tommasini, Anna Monica Bianco

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Background Nucleotide-binding oligomerization domain 2 (NOD2) is a key intracellular protein of the innate immune system. NOD2 variants are associated with inflammatory bowel disease (IBD) and other inflammatory phenotypes. We described the case of a baby with a very early-onset IBD who is characterized by a rare homozygous variant in NOD2, found through whole-exome sequencing, Its pathogenic effect was investigated through bioinformatics and functional studies. Methods The microbicide activity of the patient's phagocytes was analyzed using Escherichia coli. HEK293 and Caco2 cell lines were transfected with wild-type and mutated NOD2 cDNA to evaluate the NF-kB activity and the protein distribution. The functionality of the NOD2 pathway was assessed through analysis of the expression of tumor nectrosis factor alpha (TNFα) on monocytes. The levels of various cytokines were quantified in the patient plasma by a multiplex suspension array. Results A missense NOD2 mutation, c.G1277A; p.R426H in homozygosis, was found. The patient's microbicide activity was comparable to that observed in controls. HEK293 cells transfected with the mutated cDNA showed a 20-fold increase of NF-kB activation in basal condition. Moreover, Caco2 immunostaining revealed a different cytoplasmic distribution of the mutated protein compared with wild-type. A higher production of TNFα by monocytes and elevated levels of plasmatic cytokines and chemokines were evidenced in the patient. Conclusions This homozygous mutation is functionally relevant and shows a different NOD2 involvement in the IBD phenotype. In our patient, this mutation caused a gain of function typical of the Blau syndrome phenotype, manifesting, however, an IBD-like phenotype.

Original languageEnglish
Pages (from-to)1204-1212
Number of pages9
JournalInflammatory Bowel Diseases
Volume24
Issue number6
DOIs
Publication statusPublished - 18 May 2018

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Nucleotides
Phenotype
Mutation
Inflammatory Bowel Diseases
NF-kappa B
HEK293 Cells
Anti-Infective Agents
Monocytes
Complementary DNA
Cytokines
Exome
Proteins
Phagocytes
Computational Biology
Chemokines
Immune System
Neoplasms
Suspensions
Escherichia coli
Cell Line

Keywords

  • cytokines profile
  • EO-IBD
  • NOD2
  • rare disease
  • WES

ASJC Scopus subject areas

  • Immunology and Allergy
  • Gastroenterology

Cite this

Girardelli, M., Loganes, C., Pin, A., Stacul, E., Decleva, E., Vozzi, D., ... Bianco, A. M. (2018). Novel NOD2 Mutation in Early-Onset Inflammatory Bowel Phenotype. Inflammatory Bowel Diseases, 24(6), 1204-1212. https://doi.org/10.1093/ibd/izy061

Novel NOD2 Mutation in Early-Onset Inflammatory Bowel Phenotype. / Girardelli, Martina; Loganes, Claudia; Pin, Alessia; Stacul, Elisabetta; Decleva, Eva; Vozzi, Diego; Baj, Gabriele; De Giacomo, Costantino; Tommasini, Alberto; Bianco, Anna Monica.

In: Inflammatory Bowel Diseases, Vol. 24, No. 6, 18.05.2018, p. 1204-1212.

Research output: Contribution to journalArticle

Girardelli, M, Loganes, C, Pin, A, Stacul, E, Decleva, E, Vozzi, D, Baj, G, De Giacomo, C, Tommasini, A & Bianco, AM 2018, 'Novel NOD2 Mutation in Early-Onset Inflammatory Bowel Phenotype', Inflammatory Bowel Diseases, vol. 24, no. 6, pp. 1204-1212. https://doi.org/10.1093/ibd/izy061
Girardelli M, Loganes C, Pin A, Stacul E, Decleva E, Vozzi D et al. Novel NOD2 Mutation in Early-Onset Inflammatory Bowel Phenotype. Inflammatory Bowel Diseases. 2018 May 18;24(6):1204-1212. https://doi.org/10.1093/ibd/izy061
Girardelli, Martina ; Loganes, Claudia ; Pin, Alessia ; Stacul, Elisabetta ; Decleva, Eva ; Vozzi, Diego ; Baj, Gabriele ; De Giacomo, Costantino ; Tommasini, Alberto ; Bianco, Anna Monica. / Novel NOD2 Mutation in Early-Onset Inflammatory Bowel Phenotype. In: Inflammatory Bowel Diseases. 2018 ; Vol. 24, No. 6. pp. 1204-1212.
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AB - Background Nucleotide-binding oligomerization domain 2 (NOD2) is a key intracellular protein of the innate immune system. NOD2 variants are associated with inflammatory bowel disease (IBD) and other inflammatory phenotypes. We described the case of a baby with a very early-onset IBD who is characterized by a rare homozygous variant in NOD2, found through whole-exome sequencing, Its pathogenic effect was investigated through bioinformatics and functional studies. Methods The microbicide activity of the patient's phagocytes was analyzed using Escherichia coli. HEK293 and Caco2 cell lines were transfected with wild-type and mutated NOD2 cDNA to evaluate the NF-kB activity and the protein distribution. The functionality of the NOD2 pathway was assessed through analysis of the expression of tumor nectrosis factor alpha (TNFα) on monocytes. The levels of various cytokines were quantified in the patient plasma by a multiplex suspension array. Results A missense NOD2 mutation, c.G1277A; p.R426H in homozygosis, was found. The patient's microbicide activity was comparable to that observed in controls. HEK293 cells transfected with the mutated cDNA showed a 20-fold increase of NF-kB activation in basal condition. Moreover, Caco2 immunostaining revealed a different cytoplasmic distribution of the mutated protein compared with wild-type. A higher production of TNFα by monocytes and elevated levels of plasmatic cytokines and chemokines were evidenced in the patient. Conclusions This homozygous mutation is functionally relevant and shows a different NOD2 involvement in the IBD phenotype. In our patient, this mutation caused a gain of function typical of the Blau syndrome phenotype, manifesting, however, an IBD-like phenotype.

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