The OSMR Gene Is Involved in Hirschsprung Associated Enterocolitis Susceptibility through an Altered Downstream Signaling.

Abstract

Hirschsprung (HSCR) Associated Enterocolitis (HAEC) is a common life-threatening complication in HSCR. HAEC is suggested to be due to a loss of gut homeostasis caused by impairment of immune system, barrier defense, and microbiome, likely related to genetic causes. No gene has been claimed to contribute to HAEC occurrence, yet. Genetic investigation of HAEC by Whole-Exome Sequencing (WES) on 24 HSCR patients affected (HAEC) or not affected (HSCR-only) by enterocolitis and replication of results on a larger panel of patients allowed the identification of the HAEC susceptibility variant p.H187Q in the Oncostatin-M receptor (OSMR) gene (14.6% in HAEC and 5.1% in HSCR-only, p = 0.0024). Proteomic analysis on the lymphoblastoid cell lines from one HAEC patient homozygote for this variant and one HAEC patient not carrying the variant revealed two well distinct clusters of proteins significantly up or downregulated upon OSM stimulation. A marked enrichment in immune response pathways (q < 0.0001) was shown in the HAEC H187 cell line, while proteins upregulated in the HAEC Q187 lymphoblasts sustained pathways likely involved in pathogen infection and inflammation. In conclusion, OSMR p.H187Q is an HAEC susceptibility variant and perturbates the downstream signaling cascade necessary for the gut immune response and homeostasis maintenance.

• Authors: Tiziana Bachetti, Francesca Rosamilia, Martina Bartolucci, Giuseppe Santamaria, Manuela Mosconi, Serenella Sartori, Maria Rosaria De Filippo, Marco Di Duca, Valentina Obino, Stefano Avanzini, Domenico Mavilio, Simona Candiani, Andrea Petretto, Alessio Pini Prato, Isabella Ceccherini, Francesca Lantieri
• Journal: International journal of molecular sciences (Int J Mol Sci) Vol. 22 Issue 8 (Apr 07 2021) ISSN: 1422-0067 [Electronic] Switzerland
• PMID: 33917126 (Publication Type: Journal Article)

Chemical References

• OSMR protein, human
• Oncostatin M Receptor beta Subunit

Topics

• Alleles
• Disease Susceptibility
• Enterocolitis (etiology, metabolism, pathology)
• Gene Expression
• Gene Frequency
• Genetic Variation
• Genotype
• Hirschsprung Disease (complications, diagnosis, genetics)
• Humans
• Models, Molecular
• Oncostatin M Receptor beta Subunit (chemistry, genetics, metabolism)
• Protein Conformation
• Proteomics (methods)
• Signal Transduction
• Structure-Activity Relationship
• Exome Sequencing
• Whole Genome Sequencing