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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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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...
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Regulated mRNA Transport02:22

Regulated mRNA Transport

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

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The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
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Translational Regulation01:29

Translational Regulation

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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
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相关实验视频

Updated: Sep 10, 2025

Author Spotlight: Exploring the Frontier of mRNA Research with Poly A Tail Analysis Techniques
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一个动力统治器控制mRNA多项A) 尾巴长度

Emilie Gabs1, Emil Aalto-Setälä1, Aada Välisaari1

  • 1Department of Life Technologies, University of Turku, Turku 20520, Finland.

Genes & development
|August 22, 2025
PubMed
概括

通过与合成相竞争,NAB2蛋白质二元化控制了酵母中的mRNA多A尾长. 这种动力统治机制确保了统一的尾巴长度,这对于基因表达的调节至关重要.

关键词:
CCCH指蛋白其他结合RNA的蛋白质ZC3H14 其他分裂和多化复合物 (CPAC)动力规则mRNA多化聚A结合蛋白 (PABP)多种类型的尾

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科学领域:

  • 分子生物学
  • 生物化学
  • 酵母遗传学

背景情况:

  • 聚甲尾对mRNA稳定性和翻译至关重要.
  • 分裂和多化复合体 (CPAC) 和多A结合蛋白 (PABPs) 合作合成均的多A尾.
  • 在Saccharomyces cerevisiae中,Nab2是关键的PABP,调节mRNA多元A尾的生物发生.

研究的目的:

  • 通过Nab2阐明聚甲尾长度控制的分子机制.
  • 调查Nab2二聚化在多化终结中的作用.
  • 了解Nab2结合动力学如何影响成熟的多甲尾长.

主要方法:

  • 在体外复制多化反应.
  • 形成Nab2:poly(A) RNA核糖蛋白颗粒.
  • 对Nab2二分化和RNA结合动力学的分析.

主要成果:

  • 对于多化终结而言,NAB2二聚化是必不可少的.
  • 在长于25个腺的多A尾部上,NAB2二元是稳定的,防止过早终止.
  • 聚甲尾长是由CPAC延长和Nab2结合之间的动力竞争决定的.
  • 在RNA结合速率的自调 Nab2度缓冲器变化.

结论:

  • 尾长度控制通过"动力规则"机制运行.
  • 纳比2度量化了RNA的长度,确保了均的多A尾部形成.
  • 这种机制确保了Saccharomyces cerevisiae中适当的基因表达调节.