Abstract
CD28, cytotoxic T-lymphocyte associated antigen 4 (CTLA4), inducible costimulator (ICOS) and programmed cell death 1 are closely-linked genes located on chromosome 2q and encode co-stimulatory molecules, which are T-cell activity regulators. The principal assignment of T-cell mediated immune response in allograft rejection is an interesting topic of multiple studies. Although the variation in these genes may influence the graft survival and the amount of immunosuppression needed, the studies so far have been restricted solely to the CTLA4 gene. In 145 patients who underwent liver allograft transplantation, 10 single nucleotide polymorphisms of CD28, CTLA4, ICOS, and PD.1 genes were defined. To distinguish the polymorphisms of all 10 SNPs, PCR-RFLP method was used and according to the standard criteria, acute rejection episodes were determined. CTLA4-1661, AA genotype was significantly more frequent in the patients with acute rejection and AG genotype was significantly more frequent in the patients without rejection. Frequencies of CTLA4+49 AG A allele and CTLA4-1661AG A allele were significantly higher than those of CTLA4+49 AG and CTLA4-1661AG, G allele in the patients with acute rejection. ICOS+693, GG genotype and G allele w...Continue Reading
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