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相关概念视频

Cell Specific Gene Expression01:58

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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解码类细胞类型的基因调节

Anamaria Elek1,2, Marta Iglesias3, Lukas Mahieu4

  • 1Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology (BIST), Barcelona, Spain.

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此摘要是机器生成的。

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科学领域:

  • 进化生物学是进化的生物学.
  • 基因组学就是基因组学.
  • 细胞生物学 细胞生物学

背景情况:

  • 动物细胞类型是由于差异性基因表达而产生的,由与 cis 调节元件 (CREs) 结合的转录因子控制.
  • 了解定义细胞身份的基因调节网络 (GRNs) 对于破译细胞类型进化至关重要,特别是在像类动物这样的早期分支动物中.
  • 克尼达人提供了关于细胞类型特定基因组调节的早期演变的见解.

研究的目的:

  • 为了描述染色质可访问性和识别海藻中CREs,海藻Nematostella vectensis.
  • 解码管理CRE活动的监管语法,推断细胞类型关系.
  • 为了重建定义类细胞类型的GRNs,并探索动物基因调节的保存原则.

主要方法:

  • 来自Nematostella vectensis成人和胚胎的6万个细胞中的染色质可访问性概况.
  • 在细胞类型中识别和量化112,728个假定CREs的活性.
  • 训练基于序列的模型来预测CRE可访问性和整合数据与转录因子表达来重建GRNs.

主要成果:

  • 发现了112,728个假定CREs,它们具有普遍的组合增强剂使用和独特的促进器架构.
  • 开发预测模型,推断细胞类型的相似性,反映已知的遗传关系.
  • 重建了GRNs定义类细胞类型,揭示了简单动物中的调节复杂性.

结论:

  • 这项研究阐明了类动物细胞分化背后的调控复杂性.
  • 确定了动物基因调节中的保存原则,为比较性调节基因组学提供了基础.
  • 强调研究早期分支的元动物对于理解动物细胞类型多样性的演变的重要性.