骨髓母细胞瘤外体序列测序揭示了亚型特定的体质突变
Trevor J Pugh1, Shyamal Dilhan Weeraratne, Tenley C Archer
1Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, USA.
Nature
|July 24, 2012
概括
这项研究确定了儿科脑髓母细胞瘤,一种常见的大脑瘤的新遗传突变. 发现包括DDX3X和N-CoR复杂基因的改变,提供新的治疗点.
科学领域:
- 基因组学就是基因组学.
- 儿科瘤学 儿科瘤学
- 分子生物学分子生物学
背景情况:
- 脑髓母细胞瘤是最常见的儿科恶性脑瘤.
- 了解遗传驱动因素对于改善诊断和治疗至关重要.
- 此前已经确定了不同的脑髓母细胞瘤分子亚型.
研究的目的:
- 通过全外体序列测序,在脑髓母细胞瘤中识别新的体质突变.
- 阐明新发现的突变基因在脑髓母细胞瘤发病过程中的作用.
- 了解脑髓母细胞瘤亚型中不同信号通路之间的相互作用.
主要方法:
- 整体外体杂交捕获和深度测序92个初级髓母细胞瘤/正常对.
- 统计分析以确定显著突变的基因.
- 功能性测试,以调查DDX3X突变对WNT信号传递的影响.
主要成果:
- 脑髓母细胞瘤具有较低的突变率 (中位数为0.35个非静态突变/Mb).
- 发现有12个基因发生显著突变,包括已知的基因 (CTNNB1,TP53) 和新型基因 (DDX3X,GPS2,BCOR,LDB1).
- 突变DDX3X增强了WNT信号传递和细胞活力,特别是突变CTNNB1.1.
结论:
- 这项研究揭示了WNT,刺,组蛋白甲基转移酶和N-CoR通路在脑髓母细胞瘤亚型中的变化.
- RNA螺旋酶DDX3X被认为是神经髓母细胞瘤中致病性β-catenin信号传递的一个组成部分.
- 这些发现提名DDX3X和N-CoR复杂基因作为髓母细胞瘤的潜在治疗点.
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