Blood:基因组整体分析揭示原发性纵隔大B细胞淋巴瘤的主要致病机制

2019-07-16 MedSci MedSci原创

原发性纵隔大B细胞淋巴瘤(PMBL)是一种具有独特的临床和病理特征的大B细胞淋巴瘤亚型。包括全基因表达谱在内的分子研究表明,PMBL与经典霍奇金淋巴瘤(cHL)的关系更为密切。虽然靶向测序研究提示PMBL发病机制中涉及大量突变,但仍缺乏对疾病相关基因突变和异常通路的全面描述。现研究人员对95例PMBL肿瘤进行了全外显子测序,试图阐明致癌驱动基因和复发性拷贝数变异(CNV)。将体细胞基因突变与基因表

原发性纵隔大B细胞淋巴瘤(PMBL)是一种具有独特的临床和病理特征的大B细胞淋巴瘤亚型。包括全基因表达谱在内的分子研究表明,PMBL与经典霍奇金淋巴瘤(cHL)的关系更为密切。虽然靶向测序研究提示PMBL发病机制中涉及大量突变,但仍缺乏对疾病相关基因突变和异常通路的全面描述。

现研究人员对95例PMBL肿瘤进行了全外显子测序,试图阐明致癌驱动基因和复发性拷贝数变异(CNV)。将体细胞基因突变与基因表达特征结合为解释PMBL基因型与表型的相互关系提供了进一步的研究。

研究人员在JAK-STAT和NF-kB信号通路中发现了高复发的致癌突变,为免疫逃逸在PMBL中的重要性提供了额外的证据(CIITA, CD58, B2M, CD274, PDCD1LG2)。本研究分析强调了IRF通路是一个假定的新标志,在多个通路成员(IRF2BP2, IRF4, IRF8)中经常发生变异。

此外,综合分析阐明了JAK1、RELB和EP300基因突变驱动致癌信号的重要性。鉴定出的驱动基因在PMBL中发生突变的频率明显高于弥漫性大B细胞淋巴瘤,而在PMBL和cHL之间只有少数基因存在显著差异,这说明了这些肿瘤之间的密切关系。

总而言之,本研究是在PMBL的一个大队列上进行的,强调了独特的基因变异对疾病分类的重要性,以及与诊断和治疗决策的相关性。

原始出处:

Anja Mottok, et al.Integrative genomic analysis identifies key pathogenic mechanisms in primary mediastinal large B-cell lymphoma. Blood 2019 :blood.2019001126; doi: https://doi.org/10.1182/blood.2019001126

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