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Related Concept Videos

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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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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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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
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Spt5 orchestrates cryptic transcript suppression and transcriptional directionality.

Haejin An1, Hyeokjun Yang1, Daeyoup Lee2

  • 1Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.

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Summary

Spt5 protein suppresses intragenic antisense transcription, maintaining accurate RNA polymerase II transcription. Its depletion alters chromatin structure, increasing antisense RNA and impacting gene expression regulation.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Chromatin Biology

Background:

  • Spt5 is a conserved transcription factor regulating multiple stages of gene expression.
  • Previous studies noted increased antisense transcripts near promoters upon Spt5 mutation.
  • The precise role of Spt5 in antisense transcription regulation remained unclear.

Purpose of the Study:

  • To identify and characterize Spt5p-restricted intragenic antisense transcripts in yeast.
  • To investigate the mechanism by which Spt5 regulates antisense transcription.
  • To determine the functional significance of Spt5-mediated antisense suppression.

Main Methods:

  • Analysis of antisense transcripts in yeast cells with varying Spt5 functional states.
  • Investigation of Spt5 CTR phosphorylation's role in antisense regulation.
  • Assessment of chromatin structure changes (histone acetylation) upon Spt5 depletion.
  • Identification of termination factors involved in Spt5's antisense restriction.

Main Results:

  • Spt5p strongly suppresses intragenic antisense transcription, particularly for genes with high sense transcription.
  • Spt5 CTR phosphorylation is crucial for its antisense regulatory function.
  • Spt5 depletion leads to increased histone acetylation, altering chromatin and initiating antisense transcription.
  • Conservation of Spt5-mediated antisense suppression observed in human genes.

Conclusions:

  • Spt5 plays a novel role in balancing transcriptional bidirectionality by suppressing unstable transcripts (DUTs).
  • Spt5-mediated suppression of antisense transcription is essential for accurate RNA polymerase II transcription.
  • Understanding Spt5's role in antisense regulation provides insights into maintaining genome stability and proper gene expression.