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相关概念视频

Combinatorial Gene Control02:33

Combinatorial Gene Control

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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.
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...
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Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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General Transcription Factors01:30

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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相关实验视频

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Real-time Analysis of Transcription Factor Binding, Transcription, Translation, and Turnover to Display Global Events During Cellular Activation
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翻译效率共变确定了跨细胞类型的保存协调模式.

Yue Liu1, Shilpa Rao1, Ian Hoskins1

  • 1Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA.

Nature biotechnology
|July 27, 2025
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概括

这项研究引入了翻译效率共变 (TEC),以揭示跨细胞协调的基因翻译模式. 在哺乳动物中保存TEC,并识别了RNA分析遗漏的基因功能,提供了新的生物技术应用.

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科学领域:

  • 基因组学就是基因组学.
  • 分子生物学分子生物学
  • 系统生物学 系统生物学

背景情况:

  • 基因表达协调在RNA水平上得到了很好的研究,有助于调控网络的发现.
  • 基因表达在翻译水平上的协调在很大程度上仍未被探索.

研究的目的:

  • 调查基因表达协调是否延伸到翻译水平.
  • 引入和定义翻译效率共变量 (TEC) 作为协调翻译的衡量标准.
  • 探索TEC在哺乳动物中的保护和功能影响.

主要方法:

  • 统一分析了来自人类和小鼠组织/细胞系的3819个核糖体分析数据集.
  • 开发和应用TEC指标以确定协调翻译模式.
  • 将TEC与RNA和蛋白质共同表达模式进行比较.

主要成果:

  • 确定TEC作为哺乳动物转录组中保存的组织原理.
  • TEC揭示了从RNA或蛋白质共同表达中不明显的基因功能.
  • 物理相互作用的蛋白质在翻译和转录层面都表现出丰富的正共变性.
  • 提名的候选机制驱动共享的翻译监管模式.

结论:

  • 翻译效率共变 (TEC) 是哺乳动物基因表达的一个保存特征.
  • TEC为了解基因功能和调节提供了一个新的框架.
  • TEC具有作为预测标记物和合成生物学应用的潜力.