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Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Although bacterial genomes are much...
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Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
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Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Related Experiment Video

Updated: May 2, 2026

Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
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Bacterial genome instability.

Elise Darmon1, David R F Leach

  • 1Address correspondence to David R. F. Leach, d.leach@ed.ac.uk.

Microbiology and Molecular Biology Reviews : MMBR
|March 7, 2014
PubMed
Summary

Bacterial genomes balance stability and instability, utilizing genetic elements and processes that drive evolution through gene transfer and rearrangement. This plasticity impacts disease control.

Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • Bacterial genomes exhibit short-term stability but long-term evolutionary plasticity.
  • Horizontal gene transfer, genome rearrangement, and mobile DNA elements significantly shape bacterial genomes.
  • A balance exists between maintaining genome stability and tolerating genome instability.

Purpose of the Study:

  • To review genetic elements and processes contributing to bacterial genome instability.
  • To discuss the physiological and evolutionary consequences of genome instability.
  • To highlight the role of genome plasticity in bacterial evolution and disease control.

Main Methods:

  • Review of existing literature on bacterial genome dynamics.
  • Analysis of specialized genetic elements and endogenous processes.

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  • Discussion of physiological and evolutionary impacts.

    • Main Results:

    • Specialized genetic elements and endogenous processes drive genome instability in bacteria.
    • Genome instability facilitates physiological adaptations like phase and antigenic variation.
    • Horizontal gene transfer is a major driver of bacterial evolution and adaptation.

    Conclusions:

    • Bacterial genome instability is a key feature enabling adaptation and evolution.
    • The evolutionary plasticity of bacterial genomes presents challenges for disease control.
    • Understanding genome dynamics is crucial for managing bacterial infections.