IBD-linked Genetic Variance in Intestinal Transplantation: A Multicenter Cohort Analysis

Area of Science:

• Transplantation immunology
• Genetics
• Gastroenterology

Background:

• Intestinal transplantation (ITx) presents significant challenges in solid organ transplantation.
• Previous research indicated NOD2 genetic variations influence ITx outcomes.
• Numerous inflammatory bowel disease-associated genetic variants (IBDGVs) have since been identified.

Purpose of the Study:

• To investigate the prevalence of IBDGVs in European individuals undergoing ITx.
• To determine the association between IBDGVs and ITx outcomes, including patient and graft survival, and acute/chronic rejection.
• To explore the functional pathways implicated by these genetic associations.

Main Methods:

• A multicenter study involving 150 donor/recipient pairs from 5 international ITx centers.
• Genotyping-by-sequencing of 540 IBDGVs in a European cohort (53 donors, 101 recipients).
• Cox regression analysis for ITx outcomes (survival, rejection) and pathway analysis for significant IBDGVs.

Main Results:

• Multiple significant associations (P<0.05) were found between IBDGVs and ITx outcomes, affecting survival and rejection.
• Donor/recipient IBDGVs showed mixed protective and detrimental effects; combined donor-recipient IBDGVs were predominantly detrimental.
• Pathway analysis revealed enrichment in immune response and epithelial barrier function pathways, including IL-12 and S100 signaling.

Conclusions:

• The study identified several IBDGVs associated with ITx outcomes in a European cohort.
• These IBDGVs may serve as potential biomarkers for optimizing donor selection.
• Findings suggest IBDGVs could inform post-transplant management strategies to improve patient outcomes.