对哺乳动物内源转录和表观遗传状态的光学控制
Silvana Konermann1,2, Mark D Brigham1,2,3, Alexandro Trevino1,2
1Broad Institute of MIT and Harvard, 7 Cambridge Center, Cambridge, MA 02142, USA.
Nature
|July 24, 2013
概括
研究人员开发了光诱导转录效应器 (LITE),这是一种用于精确控制哺乳动物基因表达的新型光遗传系统. 这项技术允许快速,可逆调制内源基因和表观遗传修饰 in vivo.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 神经科学是一个神经科学.
背景情况:
- 基因表达动态对于细胞功能和适应至关重要.
- 光遗传工具提供精确的时空控制,但缺乏强大的哺乳动物转录调制.
- 用光学控制准内生哺乳动物基因组仍然是一个挑战.
研究的目的:
- 开发一种多功能光遗传系统,以精确,光诱导控制哺乳动物系统内源基因表达.
- 创建一项技术,使用光线实现有针对性的表观遗传修饰.
- 为了验证系统在初级神经元和体内自由行为小鼠中的有效性.
主要方法:
- 通过将TALE DNA结合域与加密染色体2和CIB1.1集成,设计了可诱导光的转录效应器 (LITE).
- 开发了一个可定制的双混合系统,由蓝光激活.
- 利用病毒载体对特定细胞种群进行遗传向.
主要成果:
- LITE能够快速 (几分钟) 和可逆光学调制内源基因表达,没有外源辅因子.
- 该系统成功地准了小鼠初级神经元和活小鼠大脑中的特定基因组位置.
- 在体内使用LITE系统证明了向的表观遗传色素修饰.
结论:
- 莱特提供了一种新的光遗传学方法,用于控制哺乳动物内源细胞过程.
- 该系统有助于直接调查生物过程和疾病中的遗传和表观遗传调节.
- 简单的提供一个强大的工具,用于神经科学研究和理解基因功能 in vivo.
相关概念视频
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Epigenetic Regulation
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Combinatorial Gene Control
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...


