小柯机器人

镶嵌拷贝数变异可增加自闭症风险
2021-01-14 14:42

美国哈佛大学Po-Ru Loh等研究人员合作发现,镶嵌拷贝数变异可增加自闭症风险。2021年1月11日,国际知名学术期刊《自然—神经科学》在线发表了这一成果。

研究人员表示,尽管生殖系从头拷贝数变体(CNV)是自闭症谱系障碍(ASD)的已知病因,但尚未研究镶嵌(早期发育)拷贝数变体(mCNV)的作用。

通过确定来自12077名ASD先证者和5500名未患病兄弟姐妹基因型阵列数据中的mCNV,研究人员评估了mCNV对ASD的贡献。研究人员在先证者中检测到46个mCNV,在同胞中检测到19个mCNV,其影响了2.8–73.8%的细胞。先证者承受着很大的(> 4-Mb)mCNV负担,在25个先证者中被检测到,但只有一个同胞(几率=11.4,95%置信区间=1.5-84.2,P=7.4×10-4)。事件的大小与ASD症状的严重程度呈正相关(P=0.016)。

令人惊讶的是,研究人员没有观察到在ASD中反复出现的短从头CNV嵌合类似物(例如16p11.2)。研究人员进一步实验性验证了另外59个先证者在死后脑组织中的两个mCNV。这些结果表明,mCNV是导致ASD风险的一个因素。

附:英文原文

Title: Large mosaic copy number variations confer autism risk

Author: Maxwell A. Sherman, Rachel E. Rodin, Giulio Genovese, Caroline Dias, Alison R. Barton, Ronen E. Mukamel, Bonnie Berger, Peter J. Park, Christopher A. Walsh, Po-Ru Loh

Issue&Volume: 2021-01-11

Abstract: Although germline de novo copy number variants (CNVs) are known causes of autism spectrum disorder (ASD), the contribution of mosaic (early-developmental) copy number variants (mCNVs) has not been explored. In this study, we assessed the contribution of mCNVs to ASD by ascertaining mCNVs in genotype array intensity data from 12,077 probands with ASD and 5,500 unaffected siblings. We detected 46 mCNVs in probands and 19 mCNVs in siblings, affecting 2.8–73.8% of cells. Probands carried a significant burden of large (>4-Mb) mCNVs, which were detected in 25 probands but only one sibling (odds ratio=11.4, 95% confidence interval=1.5–84.2, P=7.4×104). Event size positively correlated with severity of ASD symptoms (P=0.016). Surprisingly, we did not observe mosaic analogues of the short de novo CNVs recurrently observed in ASD (eg, 16p11.2). We further experimentally validated two mCNVs in postmortem brain tissue from 59 additional probands. These results indicate that mCNVs contribute a previously unexplained component of ASD risk.

DOI: 10.1038/s41593-020-00766-5

Source: https://www.nature.com/articles/s41593-020-00766-5

Nature Neuroscience:《自然—神经科学》,创刊于1998年。隶属于施普林格·自然出版集团,最新IF:28.771
官方网址:https://www.nature.com/neuro/
投稿链接:https://mts-nn.nature.com/cgi-bin/main.plex


本期文章:《自然—神经科学》:Online/在线发表

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