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相关概念视频

Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

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Structure of a Gene01:30

Structure of a Gene

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A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...
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What is Gene Expression?01:36

What is Gene Expression?

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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Constitutive and Regulated Gene Expression01:27

Constitutive and Regulated Gene Expression

Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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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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Real-time Bioluminescence Imaging of Notch Signaling Dynamics during Murine Neurogenesis
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基因表达的稳定发育模式,没有形态基因梯度.

Maciej Majka1,2, Nils B Becker3,4, Pieter Rein Ten Wolde3

  • 1Institute of Theoretical Physics and Mark Kac Center for Complex Systems Research, Jagiellonian University, Kraków, Poland.

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|December 2, 2024
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概括
此摘要是机器生成的。

发育中的胚胎保持稳定的基因表达模式,没有形态基因梯度. 基因调控相互作用的最佳调整创造了一个转移稳定的状态,保护模式免受细胞噪声的影响.

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Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps
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Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients
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科学领域:

  • 发育生物学是发展生物学.
  • 系统生物学 系统生物学
  • 计算生物学是一种计算生物学.

背景情况:

  • 发育中的生物体中的基因表达模式最初是由形态基因梯度驱动的.
  • 随着发育的进展,形态原体的活性下降,由于细胞噪声,风险模式不稳定.
  • 尽管如此,基因表达模式在长时间的发育过程中往往保持稳定.

研究的目的:

  • 研究基因表达模式的时空完整性如何在缺乏形态基因梯度的发育组织中保持.
  • 了解在没有连续的位置线索的情况下,模式稳定性的基础机制.

主要方法:

  • 一个最小的胚胎模型的空间静态模拟.
  • 应用非静态前向流量采样 (NFFS) 进行增强采样.
  • 利用最近开发的稳定性理论进行分析.
  • 使用模式不对称度量的缩小相位空间的分析.

主要成果:

  • 将弱交叉抑制相互作用调整到最佳水平显著延长了模式稳定性.
  • 稳定的基因表达模式可以在没有形态基因梯度的情况下在与发育相关的时间尺度上保持.
  • 模拟确定了与稳定性理论预测一致的最佳参数模式.
  • 在最佳状态下恢复力量保护模式,创建一个转移稳定的盆地.

结论:

  • 在没有全球定位线索的随机基因表达模式中,可以出现转移稳定的吸引子.
  • 优化基因调节相互作用的优化调节对于保持模式完整性至关重要.
  • 这种机制为了解早期发育中的模式稳定性提供了一个框架.