The relationship between interferon-γ gene polymorphism and acute kidney allograft rejection

Area of Science:

• Immunogenetics
• Transplantation Immunology

Background:

• Cytokine gene polymorphisms impact gene expression and protein production.
• Gamma interferon (IFN-γ) is implicated in the development of kidney transplant rejection.

Purpose of the Study:

• To investigate the association between IFN-γ gene polymorphisms and acute allograft rejection in kidney transplant recipients.
• To determine if specific IFN-γ genotypes correlate with the incidence of rejection episodes.

Main Methods:

• Polymerase chain reaction (PCR) was used to determine IFN-γ gene polymorphisms (+874 T/A, rs2430561) in 53 adult first-transplant recipients.
• Patients were followed for a median of 4 years post-transplantation to record acute rejection episodes.
• Statistical analysis excluded confounding factors such as age, HLA mismatches, and immunosuppression.

Main Results:

• The study identified three IFN-γ genotypes: T/T (high IFN-γ, n=12), T/A (intermediate, n=29), and A/A (low IFN-γ, n=12).
• None of the 12 patients with the low IFN-γ A/A genotype experienced acute rejection episodes (0/12).
• In contrast, 20 patients with T/T or T/A genotypes experienced 26 acute rejection episodes.

Conclusions:

• IFN-γ gene polymorphisms are associated with the risk of acute kidney transplant rejection.
• The low IFN-γ genotype (A/A) may confer a protective effect against acute allograft rejection.