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Related Concept Videos

Inducible Operons: lac Operon01:25

Inducible Operons: lac Operon

The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside...
Operon Model01:23

Operon 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...
Operons02:09

Operons

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...
Operons02:09

Operons

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...
Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...

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Related Experiment Video

Updated: Jun 5, 2026

In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression
08:54

In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression

Published on: March 29, 2019

From binary to multivalued to continuous models: the lac operon as a case study.

Raimo Franke1, Fabian J Theis, Steffen Klamt

  • 1Department of Chemical Biology, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany. raimo.franke@helmholtz-hzi.de

Journal of Integrative Bioinformatics
|January 5, 2011
PubMed
Summary
This summary is machine-generated.

This study models prokaryotic gene regulation, using the lac operon to show how discrete models evolve into continuous ordinary differential equation (ODE) models for dynamic behavior analysis.

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In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression
08:54

In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression

Published on: March 29, 2019

Standardized Modular Assembly of Polycistronic Operons with Modular Cloning (MoClo) using the In-Cloning toolkit
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Published on: September 2, 2025

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Area of Science:

  • Systems biology
  • Molecular biology
  • Computational biology

Background:

  • Gene regulatory networks (GRNs) are crucial for cellular function.
  • The lac operon serves as a foundational model for understanding prokaryotic gene regulation.
  • Qualitative knowledge of GRNs presents challenges for quantitative modeling.

Purpose of the Study:

  • To demonstrate a stepwise refinement approach for modeling gene regulatory systems.
  • To integrate signal transduction and transcriptional regulation across different modeling formalisms.
  • To analyze the dynamic behavior of the lac operon using a progression of models.

Main Methods:

  • Utilizing discrete Boolean models to capture initial qualitative knowledge.
  • Employing multivalued logical models to address limitations of Boolean networks.
  • Transforming logical networks into ordinary differential equation (ODE) models via multivariate polynomial interpolation.

Main Results:

  • Boolean models offer initial insights but face limitations with cyclic networks.
  • Multilevel logic provides a more realistic representation of the lac operon.
  • ODE models derived from logical networks enable detailed analysis of dynamic behaviors and feedback loops.

Conclusions:

  • A progressive modeling approach, from discrete to continuous, enhances understanding of gene regulation.
  • Multilevel logic and ODEs are powerful tools for dissecting complex regulatory mechanisms.
  • This methodology facilitates the study of dynamic behaviors in systems like the lac operon.