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Related Concept Videos

Operon Model01:23

Operon Model

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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...
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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...
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Genome Size and the Evolution of New Genes03:21

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Inducible Operons: lac Operon01:25

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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...
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Related Experiment Video

Updated: May 6, 2026

Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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Natural selection for operons depends on genome size.

Pablo A Nuñez1, Héctor Romero, Marisa D Farber

  • 1Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria (CICVyA-INTA), Buenos Aires, Argentina.

Genome Biology and Evolution
|November 9, 2013
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Summary

Genome size influences bacterial operon conservation. Larger bacterial genomes exhibit fewer, smaller, and less conserved operons, especially with complex genetic networks.

Keywords:
evolutionoperonsprokaryotes

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Area of Science:

  • Microbial genomics
  • Evolutionary biology
  • Molecular genetics

Background:

  • Genome size in prokaryotes correlates with metabolic diversity, regulatory complexity, and horizontal gene transfer.
  • Operons, gene clusters transcribed as a single unit, are crucial for prokaryotic gene regulation.
  • Understanding operon formation and maintenance is key to deciphering prokaryotic genome evolution.

Purpose of the Study:

  • To investigate the relationship between genome size and operon conservation in prokaryotes.
  • To evaluate evolutionary models of operon organization and maintenance.
  • To determine the impact of genetic network complexity on operon structure.

Main Methods:

  • Comparative genomic analysis of operon conservation across different bacterial clades.
  • Statistical analysis of gene conservation within operons based on expression levels, essentiality, and protein concentration.
  • Correlation analysis between genome size, operon characteristics, and transcription factor abundance.

Main Results:

  • Intraoperonic gene pairs, especially essential and highly expressed ones, show higher conservation.
  • Genes encoding proteins at similar cellular concentrations are more conserved within operons, suggesting cotranscription benefits.
  • Larger genomes possess fewer, smaller, and less conserved operons across all gene classes.
  • Operon conservation is inversely correlated with transcription factor abundance, indicating reduced selection for operons in complex genetic networks.

Conclusions:

  • Genome size is a significant determinant of natural selection intensity on operon organization.
  • Evolutionary models favoring coregulation advantages better explain operon formation than genetic linkage or stochastic expression.
  • Prokaryotes with larger genomes and complex regulatory networks experience weaker selection for operons compared to those with smaller genomes.