Related Experiment Video
Updated: May 20, 2026
06:28
Standardized Modular Assembly of Polycistronic Operons with Modular Cloning (MoClo) using the In-Cloning toolkit
Published on: September 2, 2025
Identification of self-consistent modulons from bacterial microarray expression data with the help of structured
Elizaveta A Permina1, Yulia A Medvedeva, Pia M Baeck
1Vavilov Institute of General Genetics, 3 Gubkina str. , Moscow, GSP-1, 119991, Russia. elizabeth.permina@vigg.ru
Journal of Biomolecular Structure & Dynamics
|July 19, 2012
Summary
This study introduces a novel method for identifying bacterial modulons using gene expression data and prior regulatory information. The approach enhances the reliability of modulon identification, especially for understudied bacterial species.
Area of Science:
- Microbiology
- Systems Biology
- Bioinformatics
Background:
- Identifying bacterial modulons is crucial for understanding gene regulation, particularly in less-studied species.
- Prior knowledge of regulatory interactions aids in inferring gene regulatory subnetworks.
Purpose of the Study:
- To develop and evaluate a procedure for bacterial modulon construction using gene expression data and seed regulons.
- To assess the impact of data parameters on modulon identification accuracy and stability.
Main Methods:
- Iterative updating of seed regulons with genes exhibiting similar expression patterns.
- Selection of essential genes within a regulon to control the updating process.
- Analysis of Escherichia coli gene expression data to test the procedure's sensitivity to data sets, relevance measures, and seed regulons.
Main Results:
- Modulon identification results are highly sensitive to the chosen data, relevance measures, and seed regulons.
- Correctly identified modulons demonstrate increased stability throughout the iterative identification process.
Conclusions:
- The developed procedure offers a reliable method for identifying bacterial modulons, even with sparse prior regulatory information.
- Modulon stability serves as an indicator of successful identification, enabling application to understudied bacterial species.
Related Concept Videos
01:29Coordination 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...
01:23Operon Model
The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
01:28Gene Regulation in Microbial Communities: Quorum Sensing
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
01:28Global Regulatory Systems
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
01:28Prokaryotic 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...
02:09Operons
Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...