HLA gene dosage effect on renal allograft survival

Area of Science:

• Nephrology
• Immunogenetics
• Transplantation

Background:

• Human leukocyte antigen (HLA) matching improves long-term renal allograft survival.
• The impact of HLA gene dosage in mismatched transplants remains unclear.
• This study investigates HLA gene dosage effects on kidney transplant outcomes.

Purpose of the Study:

• To determine the effect of donor HLA homozygosity versus heterozygosity on kidney transplant outcomes.
• To assess the association between HLA gene dosage and death-censored graft survival in kidney transplant recipients (KTRs).

Main Methods:

• Analysis of HLA typing data from 697 kidney transplant recipients (KTRs) and their donors.
• Categorization of KTRs based on whether their donors were HLA homozygous or heterozygous.
• Comparison of death-censored graft survival using Kaplan-Meier analysis and Cox proportional hazards models.

Main Results:

• Graft survival was significantly longer in KTRs with heterozygous HLA-DR and HLA-B donors compared to homozygous donors.
• HLA-DR and HLA-B donor homozygosity independently increased the risk of death-censored graft failure.
• No significant association was found between HLA-A allele states and graft survival.

Conclusions:

• HLA donor mismatch due to HLA-DR and HLA-B homozygosity significantly elevates the risk of kidney graft failure.
• Donor allele state, in addition to the number of HLA mismatches, is crucial for predicting transplant outcomes.
• Considering donor homozygosity/heterozygosity can refine risk assessment for kidney transplant recipients.