用等位基因组特异性引物扩增技术确认HLA-B新等位基因B*15:129

目的 对人类白细胞抗原(human leukocyte antigen,HLA)新等位基因HLA-B*15:129的第2～4外显子序列进行分析.方法 采用商用抽提试剂盒抽提标本DNA,应用等位基因组特异性引物PCR方法扩增先证者标本HLA-B基因第2～4外显子,PCR产物经酶切纯化后直接进行HLA-B基因第2～4外显子双向测序分析.结果 先证者标本存在2个HLA-B等位基因,1个等位基因为B*07:02,另1个经Blast验证为新的等位基因,新的等位基因序列已递交GenBank(EF473219),经世界卫生组织HLA命名委员会正式命名为HLA-B*15:129.HLA-B*15:129第2～4外显子序列与最接近的B*15:01:01:01相比,第3外显子存在3个碱基的不同,即第362位G→A、363位G→T、369位C→T改变,导致第97位氨基酸Arg→Asn.结论 发现1例新的HLA-B等位基因,被世界卫生组织HLA基因命名委员会正式命名为HLA-B*15:129.

Abstract：

Objective To analyze the sequence of the exons 2-4 of human leukocyte antigen (HLA) novel allele HLA-B*15:129.Methods DNA of the proband was extracted from whole blood by commercial DNA extraction kit. The amplification for HLA-B exons 2-4 was performed separately by polymerase chain reaction (PCR) with allele group specific primers. The PCR products were digested with enzymes and then directly sequenced for exons 2-4 of HLA-B locus in both directions.Results Sequencing results showed the HLA-B alleles of the proband included B*07:02 and a novel allele. The sequence of the novel allele has been submitted to GenBank (accession no. EF473219) and the allele has been officially named B*15:129 by the WHO Nomenclature Committee. Comparing with the HLA-B*15:01:01:01, the sequence of exons 2-4 of HLA-B*15:129 showed three nucleotide difference in exon 3 at positions 362 and 363 from GG to AT and positions 369 from C to T, which resulted in an amino acid change from Arg to Asn at codon 97.Conclusion A novel HLA-B allele was identified and has been officially named B15:129 by the WHO Nomenclature Committee.

Identification of a novel allele HLA-B*15:129 by polymerase chain reaction with allele group-specific primers

Objective To analyze the sequence of the exons 2-4 of human leukocyte antigen (HLA) novel allele HLA-B*15:129.Methods DNA of the proband was extracted from whole blood by commercial DNA extraction kit. The amplification for HLA-B exons 2-4 was performed separately by polymerase chain reaction (PCR) with allele group specific primers. The PCR products were digested with enzymes and then directly sequenced for exons 2-4 of HLA-B locus in both directions.Results Sequencing results showed the HLA-B alleles of the proband included B*07:02 and a novel allele. The sequence of the novel allele has been submitted to GenBank (accession no. EF473219) and the allele has been officially named B*15:129 by the WHO Nomenclature Committee. Comparing with the HLA-B*15:01:01:01, the sequence of exons 2-4 of HLA-B*15:129 showed three nucleotide difference in exon 3 at positions 362 and 363 from GG to AT and positions 369 from C to T, which resulted in an amino acid change from Arg to Asn at codon 97.Conclusion A novel HLA-B allele was identified and has been officially named B15:129 by the WHO Nomenclature Committee.