Hirschsprung-associated enterocolitis develops independently of NOD2 variants

Area of Science:

• Genetics
• Pediatric Gastroenterology
• Immunology

Background:

• Hirschsprung-associated enterocolitis (HAEC) is a severe complication of Hirschsprung disease (HD), contributing to significant morbidity and mortality.
• The exact pathogenesis of HAEC remains unclear, although alterations in colonic mucosal defense are implicated.
• NOD2 gene variants are strongly associated with Crohn's disease (CD) susceptibility, suggesting a potential role in other enterocolitis conditions.

Purpose of the Study:

• To investigate whether polymorphisms in the NOD2 gene predispose children with Hirschsprung disease to developing HAEC.
• To explore the potential link between genetic susceptibility factors for CD and HAEC.

Main Methods:

• Genotyping for three key NOD2 variants (rs2066844, rs2066845, rs2066847) was performed in 52 children with HD, 152 healthy controls, and 152 children with CD.
• Patient data included HD segment length and RET germline mutation status.

Main Results:

• Ten children (19.2%) with HD carried at least one NOD2 variant, compared to 11.2% of controls and 45.4% of the CD cohort.
• Seven children (13.5%) with HD developed HAEC, but none of these patients carried any of the tested NOD2 variants.

Conclusions:

• The study concludes that NOD2 variants associated with Crohn's disease do not appear to predispose children to Hirschsprung-associated enterocolitis.
• The molecular mechanisms underlying HAEC pathogenesis require further investigation due to limited current data.