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Related Concept Videos

Transcription Attenuation in Prokaryotes02:42

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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Related Experiment Video

Updated: Jul 2, 2025

A Novel Microdissection Approach to Recovering Mycobacterium tuberculosis Specific Transcripts from Formalin Fixed Paraffin Embedded Lung Granulomas
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Incomplete transcripts dominate the Mycobacterium tuberculosis transcriptome.

Xiangwu Ju1, Shuqi Li2, Ruby Froom2,3

  • 1Laboratory of Nanoscale Biophysics and Biochemistry, The Rockefeller University, New York, NY, USA.

Nature
|February 28, 2024
PubMed
Summary
This summary is machine-generated.

Most Mycobacterium tuberculosis (Mtb) transcripts are incomplete due to RNA polymerase pausing, a key checkpoint for bacterial adaptation. This pausing mechanism, influenced by the σ-factor and transcription-translation coupling, offers potential therapeutic targets for tuberculosis.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Mycobacterium tuberculosis (Mtb) causes tuberculosis (TB), a significant global health issue.
  • Mtb adapts to environmental changes by altering gene expression, but regulatory mechanisms are unclear.

Purpose of the Study:

  • To investigate the mechanisms regulating Mtb transcription.
  • To profile the Mtb transcriptome at high resolution.

Main Methods:

  • Utilized a sequencing method to determine RNA molecule termini in bacterial cells.
  • Analyzed Mtb transcriptome to identify transcript lengths and RNA polymerase activity.

Main Results:

  • Most Mtb transcripts are incomplete, with 5' ends at start sites and 3' ends downstream.
  • Short RNAs are linked to paused RNA polymerases (RNAPs), not premature termination.
  • Mtb RNAP pausing depends on σ-factor binding.
  • Translating ribosomes enhance transcription elongation, suggesting transcription-translation coupling.

Conclusions:

  • The Mtb transcriptome is characterized by incomplete transcripts due to RNAP pausing.
  • RNAP pausing acts as a crucial transcriptional checkpoint for Mtb adaptation.
  • This pausing mechanism presents a potential target for novel TB therapeutics.