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作 者:丁浩强[1] 叶欣[1] 黄颖烽[2] 邵媛[1] 陈扬凯[1] 夏文杰[1] 熊白玉
机构地区:[1]广州血液中心临床输血研究所,510095 [2]广州医学院附属广州市第一人民医院
出 处:《中华医学遗传学杂志》2014年第1期85-87,共3页Chinese Journal of Medical Genetics
基 金:国家自然科学基金(81102294);广东省自然科学基金项目(9151006001000009、9151009505000002);广州市医药卫生科技重点项目(20121A021008、20121A021021、20121A021020)
摘 要:目的鉴定1例人类白细胞抗原(human leukocyte antigen,HLA)新等位基因。方法应用双链及单链测序法进行基于序列的分型(sequence based typing,SBT),通过群体调查了解该等位基因的群体分布频率。结果该等位基因HLA—A*33:44,与A*33:03:01第4外显子相差1个核苷酸,使第866位碱基由G变为A,第265个密码子由GGT变为GAT,相应氨基酸由甘氨酸变为天门冬氨酸。与IMGT/HLA数据库中的HLA—A等位基因的序列进行对比,该突变为新的单核苷酸多态性位点。结论该新HLA等位基因在中国汉族人群中的分布频率小于0.0003,并被世界卫生组织HLA因子命名委员会命名为HLA—A*33:44(序列注册号为HQ873871)。研究新等位基因的序列可为HLA基因相关研究和应用提供信息。Objective To analyze the sequence of a novel human leukocyte antigen (HLA)-A* 33:44 allele. Methods A novel HLA-A allele was found by double-stranded sequencing combined with single-stranded sequencing. The frequency of the novel allele was determined by population survey. Results Genomic sequence of this novel HLA-A * 33:44 allele (accession No. HQ873871) has differed from HLA-B * 33:03:01 by one nucleotide in exon 4, which resulted in nt 866 G→A substitution, which results in an amino acid substitution from Gly(GGT) to Asp(GAT) at eodon 265. This alternation is a new single nucleotide polymorphism compared with other HLA-A alleles. The frequency of this new allele is less than 0. 0003 in Chinese Han population. Conclusion A mutation has been found in exon 4 of the novel HLA-A 33:44 allele, which may provide more information for HLA geue study.
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