【摘要】 为了探讨中国汉族人群弱D15型个体的Rh血型系统血型血清学表型及分子背景,采用常规血型血清学技术检测RhD抗原弱阳性个体RhD、C、c、E、e抗原表型;采用序列特异性引物-聚合酶链反应(SSP-PCR)方法同时检测RHD基因和RHCE基因;标本测序分析RHD基因全长编码区序列;同时通过特异性PCR技术测定RHD合子型或RHD基因数目。结果表明,血型血清学试验证实为D抗原弱阳性表型的人群中,有18例为弱D15型(占D抗原弱阳性表型56%),RHD基因全长编码区序列分析发现其第6外显子有一处碱基突变:845G>A,编码区序列其它部分与正常RHD序列相同;检测Rh小因子有3种表型CcEe(2例)、CcEe(2例)、ccEe(14例),分别占弱D15型的11%、11%、78%,血清学检测结果与分子生物学检测结果一致。RHD杂合性试验鉴定显示仅表型为CcEe的2例标本为纯合型RHD+/RHD+,提示基因型为DCe/DcE;其余为杂合型RHD+/RHD-,提示基因型分别是DCe/dce和DcE/dce。结论:弱D15型是中国人群中最主要的弱D型,其中大部分为杂合型。更多还原

【Abstract】 his study was aimed to investigate the molecular genetic basis and serological phenotype of Rh weak D type 15 individuals. Samples were identified by serological tests and genotyped by sequence specific primer-PCR(SSP-PCR), and were sequenced to detect the changes of all ten RHD exons. The number of gene RHD was detected through SSP-PCR. The results showed that in tested individuals of weak D type confirmed by the IAT, 18 cases(56% in weak D)were weak D type 15. Rh factors found in 2 weak D type 15 individuals (11%) were [JP6] C﹢c﹢E﹢e; Rh factors found in 2 weak D type 15 individuals (11%) were [JP6] C﹢c﹢E-e﹢; others(78%) were [JP6] c-c﹢E﹢e﹢. The results by serological tests were consistent with the results genotyped by PCR-SSP method. In all 18 samples, the sequencing result revealed a gene mutation 845G>A at the exon 6 of the RHD and the point mutation changed amino acid G282D of the RhD polypeptide. The zygosity test demonstrated that 2 out of 18 weak D type 15 individuals were RHD~+/RHD~+ homozygous (two DCe/DcE), 16 cases were RHD~+/RHD~- heterozygous (two DCe/dce and fourteen DcE/dce). It is concluded that Weak D type 15 is predominant in weak D individuals of Chinese Han Nationality, and most of them are heterozygous with various RH haplotypes.更多还原