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Analysis of LINE-1 Retrotransposition at the Single Nucleus Level
Published on: April 23, 2016
神经元中的L1逆转换是由MeCP2调节的
Alysson R Muotri1, Maria C N Marchetto, Nicole G Coufal
1University of California San Diego, School of Medicine, Department of Pediatrics/Rady Children's Hospital San Diego, La Jolla, California 92093-0695, USA. muotri@ucsd.edu
Nature
|November 19, 2010
概括
长间隔的核元素-1 (LINE-1或L1s) 逆转移子在大脑中动员,特别是当甲基-CpG结合蛋白2 (MeCP2) 缺席时. 在雷特综合征中发现的MeCP2突变增加了L1逆转换易感性,影响神经系统疾病.
科学领域:
- 基因组学就是基因组学.
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- 长间隔的核元素-1 (LINE-1或L1s) 是丰富的逆转移体,占哺乳动物基因组的20%左右.
- 活跃的L1逆转移子通过插入,删除和基因表达调节来影响基因组完整性.
- 之前的研究表明,L1在动物和人类神经元前代细胞中的动员,在成年大脑组织中具有显著的插入.
研究的目的:
- 研究甲基-CpG结合蛋白2 (MeCP2) 在调节神经元L1转录和逆转换中的作用.
- 为了确定与神经发育障碍相关的MeCP2突变是否会影响L1逆转换频率.
- 阐明控制大脑L1表达的分子机制.
主要方法:
- 利用动物模型在没有MeCP2.2的情况下研究L1逆转换.
- 使用人类诱导的多能干细胞 (iPSC) 和来自雷特综合征 (RTT) 患者的组织样本.
- 分析了与MeCP2水平和突变相关的L1神经元转录和逆转换率.
主要成果:
- 在缺乏MeCP2.2的动物中,L1神经转录和逆转换显著增加.
- 人类iPSC和来自RTT患者的组织对L1逆转移的敏感性增加.
- 通过与疾病相关的遗传突变影响L1逆转换的组织特异性控制.
结论:
- MeCP2在抑制神经元细胞中L1逆转换方面发挥着至关重要的作用.
- 在RTT中看到的MeCP2中的突变,可以导致L1逆转换的增加,可能导致神经系统疾病.
- 这些发现突显了L1逆转换作为神经疾病复杂性的因素.
相关概念视频
Overview of Transposition and Recombination
Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
LTR Retrotransposons
LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
Non-LTR Retrotransposons
As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
Master Transcription Regulators
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