零星的自闭症外体揭示了一个高度相互连接的新突变的蛋白质网络
Brian J O'Roak1, Laura Vives, Santhosh Girirajan
1Department of Genome Sciences, University of Washington School of Medicine, Seattle, Washington 98195, USA.
Nature
|April 13, 2012
概括
De novo突变,通常是父性,与自闭症谱系障碍 (ASD) 风险有关,特别是随着父亲年龄的增加. 破坏性突变准关键基因网络,为ASD提供新的诊断和治疗途径.
科学领域:
- 遗传学 是一个遗传学.
- 神经发育障碍 神经发育障碍
- 基因组医学是基因组医学.
背景情况:
- 自闭症谱系障碍 (ASD) 具有显著的遗传基础,但在70%以上的病例中,原因仍未知.
- 零星或简单的家族,缺乏先前的ASD史,被假设涉及新的突变.
- 了解这些遗传基础对于诊断和治疗至关重要.
研究的目的:
- 调查新突变在零星的ASD中的作用.
- 确定涉及ASD发展的特定基因和途径.
- 探索父亲年龄和ASD中新突变率之间的关系.
主要方法:
- 189个新的和20个先前报告的父母-子女三重组的整体外体序列测序,有零星的ASD.
- 来自这些家庭的50个未受影响的兄弟姐妹的exome测序.
- 在1,703名ASD试验者中对候选基因 (CHD8,NTNG1,GRIN2B,LAMC3,SCN1A) 的突变查.
主要成果:
- 新发点突变主要是父亲的 (4:1比),与父亲的年龄相关.
- 39%的严重de novo突变影响了与ASD候选基因相关的β-catenin/染色体重塑网络.
- 在CHD8和NTNG1中发现了复发性突变;在GRIN2B,LAMC3和SCN1A中发现了额外的de novo突变.
结论:
- 新的突变对ASD风险有很大影响,特别是在简单家族中.
- 父亲的年龄是一个危险因素,可能是由于新突变率的增加.
- 鉴定的基因和网络为未来的ASD诊断和治疗提供了目标,尽管局部异质性极大.
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