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Related Concept Videos

Evolution of Microbial Genome01:08

Evolution of Microbial Genome

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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Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
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Genome Size and the Evolution of New Genes

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Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
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The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...

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Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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Genome DNA Sequence Variation, Evolution, and Function in Bacteria and Archaea.

Hiromi Nishida1

  • 1Agricultural Bioinformatics Research Unit, Graduate School of Agricultural and Life Sciences, University of Tokyo, Japan. ahn@mail.ecc.u-tokyo.ac.jp

Current Issues in Molecular Biology
|July 10, 2012
PubMed
Summary
This summary is machine-generated.

Bacterial and archaeal genome evolution is shaped by virus resistance mechanisms, not just neutral mutations. These systems, including CRISPRs and restriction-modification, influence DNA sequence and GC content, impacting evolutionary signals.

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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Area of Science:

  • Genomics
  • Microbial Evolution
  • Bioinformatics

Background:

  • Bacterial and archaeal genome evolution involves more than neutral mutations.
  • Virus resistance systems and plasmid distribution significantly alter genome sequences.
  • Existing evolutionary models may not fully account for these complex interactions.

Purpose of the Study:

  • To investigate the impact of virus resistance and plasmid distribution on bacterial and archaeal genome evolution.
  • To determine if GC content and genomic signatures accurately reflect evolutionary relationships in prokaryotes.
  • To understand the role of specific resistance mechanisms in shaping genome composition.

Main Methods:

  • Comparative genomics analysis of bacterial and archaeal genomes.
  • Examination of DNA sequence variations, GC content, and genomic signatures.
  • Investigation of virus resistance systems such as restriction-modification and CRISPRs.
  • Analysis of horizontally transferred DNA and nucleoid-associated protein functions.

Main Results:

  • Virus resistance systems, including restriction-modification and CRISPRs, actively shape bacterial and archaeal genomes.
  • Horizontally transferred DNA typically exhibits lower GC content than host chromosomes.
  • Nucleoid-associated proteins can repress gene expression in low GC content regions, acting as a virus resistance mechanism.
  • Plasmids facilitate the distribution of genes, including those involved in virus resistance.

Conclusions:

  • GC content and genomic signatures are unreliable indicators of bacterial and archaeal evolutionary relationships due to virus resistance and horizontal gene transfer.
  • Virus resistance mechanisms are a major driving force in prokaryotic genome evolution.
  • Understanding these mechanisms is crucial for accurate phylogenetic analysis.