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[Distribution of donor-specific aKIR after unrelated allogeneic hematopoietic stem cell transplantation].
Objective: To analyze the distribution and proportion of donor-specific activated killer cell immunoglobulin like receptor (aKIR) genes and their clinical application values in unrelated allogeneic hematopoietic stem cell transplantation (allo-HSCT) . Methods: Retrospective analyses of KIR genotyping using polymerase chain reaction with sequence specific primers (PCR-SSP) were performed in 216 pairs of donors and recipients. Results: The frequency of donor-specific KIR genes was 53.7% (116/216) in 216 patients receiving unrelated allo-HSCT, with the frequency of 78.3% (112/143) in the KIR genes mismatched group and 5.5% (4/73) in matched group. Of the 116 patients with detectable donor-specific KIR genes, 99.1% (115/116) patients had various donor-specific aKIR genes. Among 55 pairs of donors' KIR-Bx genotype and patients' KIR-AA genotype group, the most commonly observed genotypes were Bx1, Bx2, Bx3, Bx4, in which the donor-specific KIR genes were respectively KIR 3DS1, 2DL5A, 2DS5, 2DS1; KIR 3DS1, 2DL5A, 2DS3, 2DS1; KIR 2DS2, 2DL2; KIR 2DS2, 2DL2, 3DS1, 2DL5A, 2DS5, 2DS1. Of 44 pairs of donors' KIR-AA genotype and patients' KIR-Bx (AB) genotype group, 36.4% (16/44) recipients had donor-specific KIR2DS4 (FUL) gene. In 143 pairs of KIR mismatched group, the frequencies of donor-specific KIR genes were KIR2DS1 (35.7%) , KIR3DS1 (32.9%) , KIR2DS5 (29.4%) , KIR2DS4 (FUL) (25.9%) , KIR2DL2 (25.2%) , KIR2DS2 (24.5%) , KIR2DS3 (21.7%) and KIR3DL1 (8.4%) , respectively. Conclusion: The donor-specific aKIR genes mainly existed in KIR mismatched group after unrelated allo-HSCT, and the different pairs of donors' and patients' KIR genotypes led to the diverse donor-specific aKIR. But there were higher specific aKIR genes in higher frequency of KIR AA, Bx1, Bx2, Bx3, Bx4 genotypes. All these can provide the experimental basis for studying the role of the donor-specific aKIR genes on the prognosis of HSCT.
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