Blood:套细胞淋巴瘤亚型的基因组学和表观遗传学分析

2020-07-02 MedSci原创 MedSci原创

在cMCL和nnMCL中,原发CCND1重排的介导机制相同,但在表观遗传和驱动程序组成上有所不同;与增殖细胞史有关的基因组复杂性和DNA甲基化变化将具有不同临床结局的患者分层。

套细胞淋巴瘤(MCL)是一种成熟的B细胞肿瘤,最初由CCND1重排驱动,具有两种分子亚型,即常规(cMCL)和非淋巴结型白血病(nnMCL),它们的临床生物学行为不同。

为了确定决定这种多样性的遗传/表观遗传改变,研究人员采用全基因组测序(61例)和外显子测序(21例)结合转录组和DNA甲基化谱分析了82例MCL样本(74% cMCL, 26% nnMCL)。

分析发现在主要易位簇基因座处的开放和活性染色质可能促进t(11; 14)(q13; 32),从而修饰了所涉及区域的3维结构。这种易位主要在两种MCL亚型的由RAG介导的前体B细胞中获得,而8%的情况发生在AID介导的成熟B细胞中。研究人员明确了新的复发性MCL驱动基因,包括CDKN1B、SAMHD1、BCOR、SYNE1、HNRNPH1、SMARCB1和DAZAP1。

复合物结构改变作为MCL靶向关键驱动基因的相关早期致癌机制出现。断裂融合桥循环和易位激活癌基因(BMI1、MIR17HG、TERT、 MYC和MYCN),产生基因扩增和重构调控区域。cMCL比nnMCL携带明显更多的结构变异、拷贝数变异和驱动基因改变;但cMCL不发生ATM变异,TP53和TERT变异在nnMCL中富集。几个驱动基因均对预后有影响,但只有TP53和MYC畸变能独立于遗传复杂性而增加预后意义。

总而言之,可通过基因组复杂性的增加以及断裂融合桥循环和DNA甲基化改变来区分具有不同临床进展的患者。

原始出处:

Ferran Nadeu,et al. Genomic and epigenomic insights into the origin, pathogenesis and clinical behavior of mantle cell lymphoma subtypes. Blood. June 25,2020.

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    2020-07-29 mqh613mqh

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