检验医学 ›› 2021, Vol. 36 ›› Issue (6): 637-641.DOI: 10.3969/j.issn.1673-8640.2021.06.013

• 临床应用研究·论著 • 上一篇    下一篇

ABO等位基因调控区突变致抗原弱表达原因分析

顾玉微1, 王成云1, 顾萍1, 潘秋辉1, 王静1(), 陈广洁2()   

  1. 1.上海交通大学医学院附属上海儿童医学中心输血科,上海 200127
    2.上海交通大学医学院,上海 200025
  • 收稿日期:2020-03-20 出版日期:2021-06-30 发布日期:2021-06-30
  • 通讯作者: 王静,陈广洁
  • 作者简介:王 静,E-mail:wjeney@163.com
    陈广洁,E-mail:guanjie_chen@163.com;
    顾玉微,女,1984年生,学士,技师,主要从事临床输血工作。

Weak expression of antigen caused by the variation in the regulatory region of ABO allele and cause analysis

GU Yuwei1, WANG Chengyun1, GU Ping1, PAN Qiuhui1, WANG Jing1(), CHEN Guangjie2()   

  1. 1. Department of Blood Transfusion,Shanghai Children's Medical Center,Shanghai Jiao Tong University School of Medicine,Shanghai 200127,China
    2. Shanghai Jiao Tong University School of Medicine,Shanghai 200025,China
  • Received:2020-03-20 Online:2021-06-30 Published:2021-06-30
  • Contact: WANG Jing,CHEN Guangjie

摘要:

目的 对1例ABO血型血清学鉴定困难的患儿进行基因分型,查找突变基因,分析血型鉴定困难的原因。方法 采用微柱凝胶法对患儿进行血清学鉴定,分别选用ABO-Rh血型确认卡(DG GelConfirm卡)、中性卡(DG GelNeutral卡)及抗球蛋白卡(DG GelCoombs卡)进行血清学血型鉴定、抗球蛋白试验和抗体筛查试验,采用聚合酶链反应(PCR)结合直接测序方法检测患儿ABO基因增强子、启动子、第1~7号外显子及其相邻的内含子区域,寻找变异位点。结果 患儿红细胞与抗A反应为弱凝集(++)、与抗B不凝集,血清与A1细胞和B细胞反应均为强凝集(++++)、与O细胞不凝集,其表型为Aweak,抗球蛋白试验和抗体筛查试验均为阴性。A基因增强子CBF/NF-Y微卫星出现4个43 bp串联,比正常情况多3个串联。结论 患儿A等位基因增强子出现的4个43 bp串联是引起其A抗原弱表达的原因。

关键词: ABO血型, 基因型, 基因调控区, 增强子

Abstract:

Objective To analyze the reason of 1 case of the discrepancy of ABO blood group and find out the mutation gene through carrying out genotyping. Methods Serologic blood group was identified by microcolumn gel method,and antibodies were screened and determined with DG GelConfirm cards,DG GelNeutral cards,DG GelCoombs cards. The enhancer,promoter,exon 1-exon 7 and their adjacent intron region of ABO gene were amplified by polymerase chain reaction(PCR),the PCR products were directly sequenced to identify the gene mutation. Results The patient's red blood cells showed weak agglutination with anti-A(++),noagglutination with anti-B. The patient's serum showed strong agglutination with A1 cell(++++),B cell(++++),noagglutination with O cells(Aweak). The direct antiglobulin test,indirect antiglobulin test and antibody screening were all negative. Totally,4 short 43 bp tandem repeat units in enhancer region was 3 more than the normal A allele. Conclusions The 4 short 43 bp tandem repeat units in enhancer region of A allele is the cause of the weak expression of A antigen.

Key words: ABO blood group, Genotype, Regulatory region, Enhancer

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