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Blood:HLA基因缺失与再生障碍性贫血临床预后的相关性

2022-02-07 Nebula MedSci原创

HLA基因分型和HLA缺失筛查可能对免疫性再生障碍性贫血患者的诊疗管理具有极其重要的临床价值

中心点:再生障碍性贫血患者的HLA基因的体细胞突变与通过细胞表面表达量所衡量的功能相关;HLA表达缺失和特异性的HLA表型与临床表现相关,特别是发病年龄和克隆进化。

免疫性再生障碍性贫血 (AA) 的特征是骨髓细胞上HLA-I类等位基因表达的缺失,这与 T 细胞介导的造血干细胞和祖细胞破坏逃逸机制一致。迄今为止,HLA异常的临床意义尚未完全阐明。

本研究在544位再生障碍性贫血患者中,分析了HLA-I 类等位基因的体系缺失及相关HLA的缺失情况和突变相关的HLA表型与AA患者接受免疫抑制治疗后的临床表现和预后的关联

再生障碍性贫血患者HLA基因的突变情况

共检测了412位患者的基因变异情况,在92位(22%)患者中检测到了HLA-I 类等位基因缺失,其中有393个HLA基因体系突变和40个杂合性缺失。突变频率最高的等位基因是HLA-B*14:02,其次是HLA-A*02:01、HLA-B*40:02、HLA-B*08:01和HLA-B*07:02。HLA-B*14:02、HLA-B*40:02和HLA-B*07:02在再生障碍性贫血中的变异频率也很高。

HLA基因突变的详细亚型

高风险克隆进化与HLA缺失、HLA-B*14:02基因型和年龄相关,研究人员利用相关数据建立了一个有效的预测模型。在两位患者中,研究人员从已存在HLA-A*02:01和HLA-B*40:02体系突变的克隆中追踪到了单体 7 克隆进化。

高风险克隆的进化情况

HLA-B*40:02缺失与更高的细胞计数相关。HLA-B*07:02和HLA-B*40:01基因型及其缺失与迟发性再生障碍性贫血相关。

总之,该研究结果揭示了具有临床意义的分子发病机制的特定免疫机制真实存在。HLA基因分型和HLA缺失筛查可能对免疫性再生障碍性贫血患者的诊疗管理具有极其重要的临床价值。

 

原始出处:

Yoshitaka Zaimoku, et al. HLA associations, somatic loss of HLA expression, and clinical outcomes in immune aplastic anemia. Blood. December 30, 2021. https://doi.org/10.1182/blood.2021012895

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    2022-09-26 wgsun
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    2022-02-08 marongnuan
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