南京地区血小板定期捐献者HLA-Ⅰ类抗原表位多态性分析

Analysis for epitope polymorphism of class HLA-Ⅰ antigen from regular platelet donors in Nanjing area

目的探讨南京地区血小板定期捐献者HLA-Ⅰ类抗原表位的分布特点,并建立血小板定期捐献者HLA表位资料库。方法采用Sanger法对南京地区649例血小板定期捐献者血液样本进行HLA高分辨率分型,利用HLA Eplet Registry网站分析HLA高分辨率分型结果对应的HLA抗原表位多态性,采用直接计数法计算等位基因频率、HLA单体型频率和HLA抗原表位频率。结果在649例血小板定期捐献者中,共检出38个HLA-A等位基因,对应36个HLA-A表位,频率较高的有79GT、144K和138MI;检出73个HLA-B等位基因,对应35个HLA-B表位,频率较高的有131S、69TNT和80N;共检出64种HLA-Ⅰ类抗原表位,频率较高的有79GT、131S和144K。结论南京地区血小板定期捐献者HLA抗原表位分布具有本地区独特的多态性特点。基于HLA抗原表位分布特点建立的表位匹配策略,可以扩大可供选择的供者范围,降低血小板输注无效的发生率。

Objective To investigate the characteristics of epitope distribution on HLA class Ⅰ antigen in the regular platelet donors from Nanjing area and establish the HLA epitope database for regular platelet donors.Methods High-resolution HLA typing was per-formed using Sanger method for the blood samples from 649 regular platelet donors in Nanjing area.The polymorphism of HLA antigen epitopes corresponding to the high-resolution HLA typing results was analyzed using the HLA Eplet Registry website.The frequencies of allele frequencies,HLA haplotype,and HLA antigen epitope were calculated by using the direct counting method.Results Among the 649 regular platelet donors,38 HLA-A alleles were detected,corresponding to 36 HLA-A epitopes,and the higher frequencies were 79GT,144K and 138MI.Seventy-three HLA-B alleles were detected corresponding to 35 HLA-B epitopes,and the higher frequencies were 131S,69TNT,and 80N.Sixty-four HLA class Ⅰ antigen epitopes were detected,in which the higher frequencies were 79GT,131S,and 144K.Conclusions The distribution of HLA antigen epitopes in the regular platelet donors of Nanjing area exhibited u-nique polymorphic characteristics.The epitope matching strategies should be established based on the distribution characteristics of HLA antigen epitopes,which may expand the range of available donors and reduce the incidence of platelet transfusion refractoriness.