We investigated the genome-wide distribution of CNVs in the Alzheimer's disease (AD) Neuroimaging Initiative (ADNI) sample (146 with AD, 313 with Mild Cognitive Impairment (MCI), and 181 controls). Comparison of single CNVs between cases (MCI and AD) and controls shows overrepresentation of large heterozygous deletions in cases (p-value<0.0001). The analysis of CNV-Regions identifies 44 copy number variable loci of heterozygous deletions, with more CNV-Regions among affected than controls (p=0.005). Seven of the 44 CNV-Regions are nominally significant for association with cognitive impairment. We validated and confirmed our main findings with genome re-sequencing of selected patients and controls. The functional pathway analysis of the genes putatively affected by deletions of CNV-Regions reveals enrichment of genes implicated in axonal guidance, cell-cell adhesion, neuronal morphogenesis and differentiation. Our findings support the role of CNVs in AD, and suggest an association between large deletions and the development of cognitive impairment.

译文

我们调查了阿尔茨海默氏病 (AD) 神经成像倡议 (ADNI) 样品 (与AD 146,轻度认知障碍 (MCI) 313和181对照) 中cnv的全基因组分布。病例 (MCI和AD) 和对照之间的单个cnv的比较显示病例中大杂合缺失的过度表示 (p值 <0.0001)。对CNV区的分析确定了44个杂合缺失的拷贝数可变基因座,受影响的CNV区比对照组更多 (p = 0.005)。44个CNV区域中有7个名义上与认知障碍相关。我们通过对选定的患者和对照组进行基因组重新测序来验证和证实我们的主要发现。对受CNV区缺失影响的基因的功能途径分析揭示了与轴突引导,细胞-细胞粘附,神经元形态发生和分化有关的基因的富集。我们的发现支持CNVs在AD中的作用,并表明大量缺失与认知障碍的发展之间存在关联。

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