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The impact of CTLA4 and PTPN22 genes polymorphisms on long-term renal allograft function and transplant outcomes

Karolina Kłoda1, Leszek Domanski, Katarzyna Bobrek-Lesiakowska

  • 1Clinical Department of Nephrology, Transplantology and Internal Medicine .

Renal Failure
|August 16, 2013
PubMed

Insights

Genetic variations in CTLA4 and PTPN22 genes do not appear to impact long-term kidney transplant outcomes. This study found no association between these specific gene polymorphisms and graft failure, dialysis, or patient mortality over five years.

Area of Science:

  • Immunogenetics
  • Transplantation immunology

Background:

  • Cytotoxic T-Lymphocyte Antigen 4 (CTLA4) and Lymphoid tyrosine phosphatase (Lyp, encoded by PTPN22) are key regulators of T-cell responses.
  • Gene polymorphisms in CTLA4 and PTPN22 may influence immune responses and kidney allograft function.
  • Understanding these genetic factors is crucial for predicting post-transplant outcomes.

Purpose of the Study:

  • To investigate the association between CTLA4 and PTPN22 gene polymorphisms and long-term renal transplant function.
  • To evaluate the impact of these polymorphisms on graft survival, dialysis requirements, and mortality in kidney transplant recipients over a 5-year period.

Main Methods:

  • Genotyping of CTLA4 rs231775 (+49AG) and PTPN22 rs2476601 (C1858T) polymorphisms in 268 Caucasian renal transplant recipients.
  • Real-time PCR and PCR-RFLP methods were utilized for genotyping.
  • Long-term follow-up assessed graft survival, dialysis, mortality, and transplant center transfers.

Main Results:

  • The 5-year graft survival rate was 81.7%.
  • No statistically significant association was found between the studied CTLA4 and PTPN22 polymorphisms and graft loss, need for dialysis, or patient mortality.
  • Genotype distributions did not differ significantly between living and deceased patients.

Conclusions:

  • The rs231775 (+49AG) CTLA4 and rs2476601 (C1858T) PTPN22 gene polymorphisms are not linked to long-term allograft failure, graft loss, or mortality after kidney transplantation.
  • These specific genetic variations do not appear to be significant predictive markers for renal transplant outcomes in the studied Caucasian population.

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