Impact of NOD2/CARD15 haplotypes on the outcome after kidney transplantation

Area of Science:

• Immunogenetics
• Transplantation immunology
• Innate immunity

Background:

• Chronic allograft nephropathy and death with a functioning graft are primary causes of late kidney transplant loss.
• NOD2/CARD15 (nucleotide oligomerization domain-2/caspase-recruiting activating domain-15), an innate immunity receptor, is implicated in inflammatory diseases and transplant mortality.
• NOD2/CARD15 polymorphisms are associated with Crohn's disease and bone marrow transplant mortality.

Purpose of the Study:

• To investigate the significance of NOD2/CARD15 haplotypes in kidney transplantation outcomes.
• To determine if specific NOD2/CARD15 genetic variations impact graft survival and patient mortality.

Main Methods:

• Genotyping of 352 first-time kidney transplant recipients for three major NOD2/CARD15 polymorphisms (R702W, G908R, 1007fs).
• Reconstruction of NOD2/CARD15 haplotypes and stratification into diplotypes (wild type vs. mutated).
• Statistical analysis to assess associations between NOD2/CARD15 haplotypes and clinical outcomes, including graft survival and mortality.

Main Results:

• Four NOD2/CARD15 haplotypes were identified: CG(-) (89.8%), CGC (3.5%), CC(-) (1.6%), and TG(-) (5.1%).
• A significant association was found between mutated NOD2/CARD15 haplotypes and increased all-cause and cardiovascular mortality, even after adjusting for covariates.
• A univariate association was observed between mutated NOD2/CARD15 haplotypes and reduced graft survival.

Conclusions:

• NOD2/CARD15 haplotypes demonstrate varied effects on post-transplant outcomes, particularly cardiovascular and all-cause mortality.
• These findings suggest a role for chronic inflammation in the observed mortality risks associated with NOD2/CARD15 variations.
• Further research is warranted to elucidate the precise association between NOD2/CARD15 haplotypes and transplant-related complications.