Genetics of follicular lymphoma transformation.

Genetics of follicular lymphoma transformation.
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DOI:
10.1016/j.celrep.2013.12.027
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发表时间:
2014-01-16
期刊:
影响因子:
8.8
通讯作者:
Dalla-Favera R
Dalla-Favera R
中科院分区:
生物学1区
文献类型:
--
作者:
Pasqualucci L;Khiabanian H;Fangazio M;Vasishtha M;Messina M;Holmes AB;Ouillette P;Trifonov V;Rossi D;Tabbò F;Ponzoni M;Chadburn A;Murty VV;Bhagat G;Gaidano G;Inghirami G;Malek SN;Rabadan R;Dalla-Favera R

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滤泡性淋巴瘤(FL)是一种慢性疾病,但30-40%的病例会发生组织学转化为侵袭性的恶性肿瘤,典型的表现为弥漫性大B细胞淋巴瘤(DLBCL)。这一过程的发病机制在很大程度上仍不清楚。利用全外显子测序和拷贝数分析,我们发现FL和转化FL(TfL)的显性克隆是由一个共同的突变前体通过获得不同的遗传事件而分化进化而来的。表观遗传修饰物和抗凋亡基因的突变是在共同的前体早期引入的,而TfL与细胞周期进程和DNA损伤反应(CDKN2A/B,MYC,TP53)的变化以及异常的体细胞过度突变具有特异性的相关性。TfL的基因组图谱与生发中心B细胞型新生DLBCL相似,但也显示了独特的改变基因组合,具有诊断和治疗意义。
Follicular lymphoma (FL) is an indolent disease, but 30-40% of cases undergo histologic transformation to an aggressive malignancy, typically represented by diffuse large B cell lymphoma (DLBCL). The pathogenesis of this process remains largely unknown. Using whole-exome sequencing and copy-number analysis, here we show that the dominant clone of FL and transformed FL (tFL) arise by divergent evolution from a common mutated precursor through the acquisition of distinct genetic events. Mutations in epigenetic modifiers and anti-apoptotic genes are introduced early in the common precursor, while tFL is specifically associated with alterations deregulating cell-cycle progression and DNA-damage responses (CDKN2A/B, MYC, TP53), as well as with aberrant somatic hypermutation. The genomic profile of tFL shares similarities with that of germinal center B-cell-type de novo DLBCL, but also displays unique combinations of altered genes, with diagnostic and therapeutic implications.
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