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相关概念视频

Position-effect Variegation02:32

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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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.
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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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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
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在合成细胞间基因切换中,模式形成和双向性.

Bárbara de Freitas Magalhães1, Gaoyang Fan2, Eduardo Sontag3

  • 1Department of Biosciences, Rice University, Houston, Texas 77005, United States.

ACS synthetic biology
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概括

科学家们在细菌中设计了一种合成的"定数感应切换"电路. 这个电路控制细胞分化,并创建空间模式,为工程生物材料铺平了道路.

关键词:
基因转换开关转换开关的转换开关模式形成 模式形成 模式形成议员数量检测是指对议员数量进行检测.自己组织的自我组织.合成生物学 合成生物学

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科学领域:

  • 合成生物学 合成生物学
  • 微生物工程是微生物的工程.
  • 发育生物学是发展生物学.

背景情况:

  • 细胞分化对于多细胞生物的发展至关重要,由形态原体和信号分子指导.
  • 合成生物学家的目标是设计微生物群落中的模式分化.
  • 切换开关是细胞分化中常见的调节组件.

研究的目的:

  • 开发一种合成电路,使细菌能够有模式分化.
  • 为了研究结合合成切换开关和细胞间信号系统的行为.
  • 探索工程空间模式细菌群落的潜力.

主要方法:

  • 将一个合成的核心压力切换开关与细胞间信号通路结合起来.
  • 创建了一个新的"定数感应切换"电路.
  • 在混合良好的液体培养物中测试电路的双稳定性.
  • 分析细菌殖民地的模式形成,以外部形态原体在上进行分析.

主要成果:

  • 定数感应切换电路在液体培养物中证明了全人口的可比性.
  • 该电路成功地生成了细菌殖民地区分的空间模式.
  • 工程电路对外部供应的形态原体做出了反应,以诱导模式.

结论:

  • 合成定数感应切换器是控制细菌分化和模式的可行工具.
  • 这种电路使空间模式细菌群落的工程成为可能.
  • 未来的应用包括使用工程细菌开发先进的生物材料和生物电子.