HLA-B新等位基因B*3936的确认和测序分析

本研究确认HLA新等位基因HLA—B％3936并分析其序列。先证者为脐血造血干细胞捐献者，样本DNA抽提采用PEL—FREEZ抽提试剂盒，利用单链特异性引物PCR方法扩增先证者HLA—B基因的第2—4外显子，对PCR产物直接进行第2、3、4外显子双向测序分析。结果显示：先证者样本中存在2个HLA—B等位基因，其中1个等位基因为HLA—B％4002，另1个经Blast验证确定为新的等位基因，新的等位基因序列已递交GenBank（DQ242650，DQ24265l，DQ242652）。与最接近的B％3901等位基因比较，新的等位基因在第3外显子上有4个核苷酸的差异，其中第527位T→A、第538位C→T、第539位T→G、第544位A→G，这引起氨基酸第152位缬氨酸（Val）→谷氨酸（Glu）、第156位异壳氨酸（Ile）→色氨酸（Trp）、第158位苏氨酸（Thr）→丙氨酸（Ala）。实验结果提示该等位基因为新的HLA-B等位基因，已被世界卫生组织HLA因子命名委员会正式命名为HLA—B％3936。

Identification and Sequence Analysis of a Novel HLA-B * 3936 Allele

The aim of study was to confirm the novel HLA allele HLA-B*3936 in Chinese population and to analyze its sequence. The proband was a cord blood donor in the Zhejiang province. DNA was extracted from whole blood by PEL-FREEZ DNA extraction kit. The amplification of HLA-B exons 2 - 4 of the proband was performed by allele specific primer PCR and the amplified product was sequenced bidirectionally with primers. The sequencing results showed HLA-B alleles of the proband as B*4002 and the novel allele. The sequences of the novel allele have been submitted to GenBank (DQ242650, DQ242651, DQ242652). After Blast HLA analysis, the novel allele showed four nucleotide differences with HLA-B*3901 at nucleotide position 527 T-->A, 538 C-->T, 539 T-->G, 544 A-->G in exon 3. It resulted in three amino acid change from Val to Glu at codon 152, Ile to Trp at codon 156, Thr to Ala at codon 158. The result suggested that this allele is a novel allele and has been officially named HLA-B*3936 by the WHO Nomenclature Committee.