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Related Concept Videos

Bacterial Transcription01:53

Bacterial Transcription

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RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
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Transcription Elongation Factors02:35

Transcription Elongation Factors

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Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
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Transcription01:10

Transcription

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Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
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Transcription in Prokaryotes01:28

Transcription in Prokaryotes

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Transcription is a highly regulated process that converts genetic information into RNA molecules. The transcription cycle is divided into three key stages: initiation, elongation, and termination, each driven by specific molecular mechanisms.Initiation of TranscriptionIn bacteria, transcription begins when the RNA polymerase core enzyme associates with a sigma factor to form a holoenzyme. For example, the E. coli sigma factor called σ70 forms a holoenzyme, which recognizes the -10 (Pribnow...
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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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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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Updated: Sep 17, 2025

Live-Cell Imaging of Transcriptional Activity at DNA Double-Strand Breaks
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Timing is everything: transcription bursting in development.

Jee Min Kim1, Daniel R Larson2

  • 1Laboratory of Receptor Biology and Gene Expression, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.

Genes & Development
|June 30, 2025
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Summary

Cellular development relies on gene expression, but transcription occurs in bursts, impacting speed and variability. This review explores how these bursts are controlled during development and the underlying molecular mechanisms.

Keywords:
developmentgene regulationsingle-celltranscription

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Differential mRNA expression is crucial for cell identity and fate transitions during development.
  • Transcription kinetics exhibit cell-to-cell heterogeneity, occurring in bursts of mRNA synthesis.
  • Transcriptional bursting influences the speed and variability of gene expression in developing systems.

Purpose of the Study:

  • To review recent literature on the modulation of transcription kinetics during differentiation and development.
  • To examine theoretical models of transcriptional bursting.
  • To explore the molecular mechanisms governing transcription kinetics.

Main Methods:

  • Literature review of studies on transcriptional regulation in development.
  • Analysis of theoretical models describing transcription bursting.
  • Synthesis of research on molecular mechanisms controlling mRNA synthesis.

Main Results:

  • Transcriptional bursting is a key factor affecting mRNA expression output during development.
  • Various molecular mechanisms and theoretical models explain the modulation of bursting kinetics.
  • Understanding these kinetics is essential for comprehending cell fate determination.

Conclusions:

  • Modulation of transcription kinetics is vital for precise control of gene expression during development.
  • Transcriptional bursting presents both challenges and opportunities for regulating cell fate.
  • Further research into molecular mechanisms can elucidate developmental processes.