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Related Concept Videos

Bacterial Transcription01:53

Bacterial Transcription

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:
Prokaryotic Gene Structure and Organization01:28

Prokaryotic Gene Structure and Organization

Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...
Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

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...
Transcription in Prokaryotes01:28

Transcription in Prokaryotes

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 box)...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...

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Updated: Jun 24, 2026

A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae
10:18

A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae

Published on: April 25, 2015

Structure and complexity of a bacterial transcriptome.

Karla D Passalacqua1, Anjana Varadarajan, Brian D Ondov

  • 1School of Biology, Georgia Institute of Technology, 310 Ferst Dr., Atlanta, GA 30332-0230, USA.

Journal of Bacteriology
|March 24, 2009
PubMed
Summary
This summary is machine-generated.

This study presents the first comprehensive, single-nucleotide resolution view of a bacterial transcriptome using high-throughput sequencing. It maps bacterial gene expression, operon structure, and transcript abundance, revealing new insights into cellular regulation.

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Probing mRNA Kinetics in Space and Time in Escherichia coli using Two-Color Single-Molecule Fluorescence In Situ Hybridization
10:01

Probing mRNA Kinetics in Space and Time in Escherichia coli using Two-Color Single-Molecule Fluorescence In Situ Hybridization

Published on: July 30, 2020

Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Bacterial gene expression, transcript structure, and operon linkages are crucial for understanding gene function and regulation.
  • Previous large-scale analyses of the prokaryotic transcriptome are limited, leaving gaps in knowledge regarding absolute mRNA composition within bacterial cells.

Purpose of the Study:

  • To develop and apply a high-throughput sequencing-based approach for a comprehensive, single-nucleotide resolution view of a bacterial transcriptome.
  • To map transcript start sites, operon structure, and absolute transcript abundance across the genome of Bacillus anthracis.
  • To identify novel transcriptional regions and improve existing genome annotations.

Main Methods:

  • Utilized high-throughput sequencing to analyze the Bacillus anthracis transcriptome.
  • Collected data under various growth conditions to ensure comprehensive sampling.
  • Developed methods for assembling a high-resolution map of the bacterial transcriptome.

Main Results:

  • Generated the first comprehensive, single-nucleotide resolution map of a bacterial transcriptome.
  • Accurately mapped transcript start sites and operon structures genome-wide.
  • Identified previously unannotated transcriptionally active regions and improved genome annotation accuracy.
  • Provided estimates of absolute transcript abundance, indicating significant transcriptional heterogeneity in clonal bacterial populations.

Conclusions:

  • The study offers an unprecedented view of bacterial gene expression and regulation at the transcriptomic level.
  • The developed approach provides a powerful tool for detailed analysis of bacterial transcriptomes.
  • Findings highlight the complexity of bacterial gene expression regulation and cellular composition.