HLA新等位基因B*5827核苷酸序列的分析

目的 确认人类白细胞抗原(human leukocyte antigen,HLA)新等位基因B*5827并分析其核苷酸序列.方法 用聚合酶链反应-序列特异性寡核苷酸探针对1份HLA分型反应异常的血样进行基因分型,并用基因克隆测序技术正反向测定DNA序列.结果 测序结果显示HLA-B位点有1个与已知HLA等位基因序列均不同的新等位基因,该等位基因与HLA-B*5820序列同源性最高.但在第3外显子存在8个碱基的差异,分别为nt 290(G＞C)、nt 346(T＞A)、nt 390(A＞C)、nt 404(G＞C)、nt 413(C＞G)、nt 471(A＞G)、nt 486(A＞G)和nt 487(C＞A).碱基的不同导致了氨基酸不同nt 97(ser＞arg)、nt115(phe＞tyr)、nt 130(ser＞arg)、nt 157(thr＞ala)和nt 162(thr＞glu),其中nt 404和nt 413是同义突变.结论 该等位基因为HLA新等位基因,基因序列已提交至GenBank数据库,提交号为GU071234,于2010年1月被世界卫生组织HLA因子命名委员会正式命名为HLA-B*5827.

Abstract：

Objective To investigate the molecular basis for a novel human leukocyte antigen(HLA)allele B * 5827. Methods DNA from the proband was analyzed by polymerase chain reaction-sequence specific oligonucleotide (PCR-SSO) typing. The amplified product was sequenced bidirectionally. Results Abnormal HLA-B locus was observed and its nucleotide sequence was different from the known HLA-B allele sequences, with highest homology to HLA-B * 5820 allele. It differs from HLA-B * 5820 by 8 nucleotide substitutions in exon 3, i. e. , nt 290 (G＞C), nt 346 (T＞A), nt 390 (A＞C), nt 404 (G＞C),nt 413 (C＞G), nt 471 (A＞G), nt 486 (A＞G) and nt 487 (C＞A), resulting in an amino acid change from ser＞arg at nt 97, phe＞tyr at nt 115, ser＞arg at nt 130, thr＞ala at nt 157 and thr＞glu at nt 162.Nucleotide differences of nt 404(G＞C) and nt 413(C＞G) did not change amino acid. Conclusion The sequences of the novel allele have been submitted to GenBank (access No. GU071234). A novel HLA class Ⅰ allele B * 5827 has been officially assigned by the WHO HLA Nomenclature Committee in Jan 2010.

Sequence analysis of a novel human leukocyte antigen allele B*5827

Objective To investigate the molecular basis for a novel human leukocyte antigen(HLA)allele B * 5827. Methods DNA from the proband was analyzed by polymerase chain reaction-sequence specific oligonucleotide (PCR-SSO) typing. The amplified product was sequenced bidirectionally. Results Abnormal HLA-B locus was observed and its nucleotide sequence was different from the known HLA-B allele sequences, with highest homology to HLA-B * 5820 allele. It differs from HLA-B * 5820 by 8 nucleotide substitutions in exon 3, i. e. , nt 290 (G＞C), nt 346 (T＞A), nt 390 (A＞C), nt 404 (G＞C),nt 413 (C＞G), nt 471 (A＞G), nt 486 (A＞G) and nt 487 (C＞A), resulting in an amino acid change from ser＞arg at nt 97, phe＞tyr at nt 115, ser＞arg at nt 130, thr＞ala at nt 157 and thr＞glu at nt 162.Nucleotide differences of nt 404(G＞C) and nt 413(C＞G) did not change amino acid. Conclusion The sequences of the novel allele have been submitted to GenBank (access No. GU071234). A novel HLA class Ⅰ allele B * 5827 has been officially assigned by the WHO HLA Nomenclature Committee in Jan 2010.