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基因组测序确定了严重智力障碍的主要原因
Christian Gilissen1, Jayne Y Hehir-Kwa1, Djie Tjwan Thung2
11] Department of Human Genetics, Radboud Institute for Molecular Life Sciences and Donders Centre for Neuroscience, Radboud University Medical Center, Geert Grooteplein 10, 6525 GA Nijmegen, the Netherlands [2].
Nature
|June 5, 2014
概括
全基因组测序在严重智力障碍 (ID) 病例中发现了显著的新生单核酸变异 (SNV) 和副本数变异 (CNV). 这种方法为大多数严重ID患者提供了全面的遗传诊断.
科学领域:
- 遗传学 是一个遗传学.
- 基因组学就是基因组学.
- 发展生物学 发展生物学
背景情况:
- 严重的智力障碍 (ID) 影响0.5%的新生儿,主要是由于遗传因素.
- 现有的基因检测,如微阵列和外基因组测序,往往无法诊断大多数ID病例.
- ID的遗传异质性需要对所有遗传变异进行全基因组检测.
研究的目的:
- 应用全基因组测序 (WGS) 来识别严重ID的遗传原因在患者之前有负面遗传测试.
- 为了确定WGS的诊断产量,在严重的ID.中对新出现的单核酸变异 (SNVs) 和副本数变异 (CNVs) 进行诊断.
- 评估WGS作为一种单一的基因测试,用于在ID.中全面检测遗传变异的实用性.
主要方法:
- 全基因组测序 (WGS) 在50名严重ID患者及其父母身上进行.
- 患者此前曾经经历过广泛的遗传预选,包括微阵列和外体序列测序.
- 分析重点在于在编码区域内确定新的SNV和CNV,以及它们与已知的ID基因的关联.
主要成果:
- 世界基因组识别了84种新的SNV,在与ID相关的基因中显著增加了功能丧失突变.
- 发现了8个新的CNV,包括删除和重复,经常影响已知的ID基因.
- 在20名患者 (42%的诊断收益率) 中,获得了确的遗传诊断,在未经选择的队列中,累计估计为62%.
结论:
- 在编码区域内新的SNV和CNV是严重ID的重要原因.
- WGS是一个强大的工具,用于识别ID的全谱遗传变异.
- 基因组测序提供了一个单一的,可靠的测试,在最严重的ID病例中实现遗传诊断.
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