Genetic analysis of a Chinese pedigree with an allele dropout at the HLA-B locus
何柳媚 1全湛柔 1钟艳平 1邹红岩 1许芯
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作者信息
1. 深圳市血液中心输血医学研究所，深圳 518020
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摘要
目的 探讨1个家系的HLA-B基因的碱基缺失情况。 方法 选取2022年4月就诊于广西柳州市人民医院的1例急性髓系白血病女性患者、丈夫和女儿作为研究对象，应用PCR-序列特异性寡核苷酸探针(PCR-SSOP)及PCR-直接测序法(PCR-SBT)对该家系进行人类白细胞抗原(HLA)常规检测。应用二代测序技术(NGS)对HLA-B基因序列进行确认。 结果 患者及其女儿HLA-B位点的PCR-SBT和PCR-SSOP结果不一致，PCR-SSOP结果分别为HLA-B*35：01，40：02和HLA-B*35：01，40：01，PCR-SBT结果则均提示与最接近的HLA-B*35：01在第4外显子处有错配。NGS结果显示患者及其女儿HLA-B*35：01第5内含子处有1段9 bp的碱基序列缺失。患者丈夫结果为HLA-B*40：01，58：01，无异常。 结论 该家系HLA-B基因第5内含子处的变异位于SBT检测的引物结合区，影响了PCR-SBT分型结果的准确性。 Objective To delineate a deletional mutation of the HLA-B gene in a Chinese pedigree. Methods A female patient with acute myeloid leukemia who had visited Liuzhou People′s Hospital in April 2022 was selected as the study subject. Routine human leukocyte antigen (HLA) was determined by using PCR-sequence specific oligonucleotide polymorphism (PCR-SSOP) and PCR-sequence-based typing (PCR-SBT) methods. Next generation sequencing (NGS) was used to validate the candidate variant in the HLA-B gene. Results The PCR-SBT and SSOP results for the HLA-B locus were inconsistent for the patient and her daughter. The SSOP results of the two individuals were HLA-B*35: 01, 40: 02 and HLA-B*35: 01, 40: 01, respectively. However, the PCR-SBT results has indicated a mismatch with the nearest HLA-B*35: 01 at exon 4. NGS results showed that the HLA-B*35: 01 had a 9 bp deletion in the intron 5. The patient′s husband was HLA-B*40: 01, 58: 01, which was normal. Conclusion The variant in intron 5 of the HLA-B gene in this pedigree has mapped to a primer-binding region for the SBT reagent, which has affected the accuracy of PCR-SBT results.
Abstract
Objective To delineate a deletional mutation of the HLA-B gene in a Chinese pedigree. Methods A female patient with acute myeloid leukemia who had visited Liuzhou People′s Hospital in April 2022 was selected as the study subject. Routine human leukocyte antigen (HLA) was determined by using PCR-sequence specific oligonucleotide polymorphism (PCR-SSOP) and PCR-sequence-based typing (PCR-SBT) methods. Next generation sequencing (NGS) was used to validate the candidate variant in the HLA-B gene. Results The PCR-SBT and SSOP results for the HLA-B locus were inconsistent for the patient and her daughter. The SSOP results of the two individuals were HLA-B*35: 01, 40: 02 and HLA-B*35: 01, 40: 01, respectively. However, the PCR-SBT results has indicated a mismatch with the nearest HLA-B*35: 01 at exon 4. NGS results showed that the HLA-B*35: 01 had a 9 bp deletion in the intron 5. The patient′s husband was HLA-B*40: 01, 58: 01, which was normal. Conclusion The variant in intron 5 of the HLA-B gene in this pedigree has mapped to a primer-binding region for the SBT reagent, which has affected the accuracy of PCR-SBT results.
关键词
HLA-B基因/碱基缺失/PCR-序列特异性寡核苷酸探针/PCR-直接测序法/二代测序
Key words
HLA-B gene/Deletional mutation/PCR-sequence specific oligonucleotide polymorphism/PCR-Sequence-based typing/Next generation sequencing
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