Nat Genet:神经母细胞瘤的表观遗传调控研究

2017-06-30 cailingrui MedSci原创

研究采用ChIP–seq的方法,分析了间质细胞和肾上腺素细胞的等位基因对,分别发现了每种细胞类型中的超强增强子图谱和与超强增强子相关的转录因子网络。间质细胞转录因子PRRX1的表达可以对超强增强子和肾上腺素细胞mRNA图谱重编程,使其达到间质细胞的状态。间充质细胞在体外具有更高的化学抗性,并在治疗后和复发的肿瘤中富集。两个超强增强子相关的转录因子网络,可能介导正常发育过程中的谱系控制,从而实现对神

神经母细胞瘤通常起源于神经嵴,原发于肾上腺部位的小儿肿瘤。在胚胎发育过程中,细胞从神经嵴开始分层,腹侧迁移并分化为产生肾上腺素或去肾上腺素的细胞。神经母细胞通常表达出肾上腺素合成途径中的酶。高级神经母细胞瘤通常在治疗后完全消失,但也常复发,并伴有耐药性。 

神经母细胞瘤和其他儿科肿瘤都很少与基因突变联系在一起,这就激发了研究人员对其表观遗传调控的兴趣。一些肿瘤类型包括许多表型各异的细胞,类似于来自不同谱系发育阶段的不同细胞。之前有研究提出,好强增强子相关的转录因子网络是谱系身份的基础,然而这些增强子在肿瘤内异质性的作用仍然是未知数。

在这项研究中,展示了包括两类肿瘤细胞在内的大多数神经母细胞瘤的不同基因表达谱。未分化的间充质细胞和肾上腺素能细胞可以相互转化,类似于来自不同细胞系不同时期的细胞。研究采用ChIP–seq的方法,分析了间质细胞和肾上腺素细胞的等位基因对,分别发现了每种细胞类型中的超强增强子图谱和与超强增强子相关的转录因子网络。间质细胞转录因子PRRX1的表达可以对超强增强子和肾上腺素细胞mRNA图谱重编程,使其达到间质细胞的状态。间充质细胞在体外具有更高的化学抗性,并在治疗后和复发的肿瘤中富集。两个超强增强子相关的转录因子网络,可能介导正常发育过程中的谱系控制,从而实现对神经母细胞瘤的表观遗传控制,并形成瘤内异质性。

原始出处:

Stacy Steinberg, et al. Neuroblastoma is composed of two super-enhancer-associated differentiation states. Nature Genetics (2017). DOI:10.1038/ng.3899

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    2018-01-08 liye789132251
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    2018-03-10 cy0324
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    2018-04-20 canlab
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