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Related Experiment Videos

Diversity-generating retroelements.

Bob Medhekar1, Jeff F Miller

  • 1Department of Microbiology, Immunology and Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA.

Current Opinion in Microbiology
|August 21, 2007
PubMed
Summary
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Diversity-generating retroelements (DGRs) are genetic elements that create DNA and protein diversity. These elements enable bacteria and phages to adapt to changing hosts, offering potential for new antimicrobial agents.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Parasite adaptation to host variability is a key biological process.
  • Diversity-generating retroelements (DGRs) are novel genetic elements that generate DNA and protein sequence diversity.
  • The prototype DGR in bacteriophage BPP-1 diversifies a gene for host receptor binding.

Purpose of the Study:

  • To investigate the mechanism and implications of diversity-generating retroelements (DGRs).
  • To understand how DGRs contribute to parasite adaptation and host specificity.
  • To explore the potential applications of DGRs in biotechnology.

Main Methods:

  • Identification and characterization of DGRs in bacteriophages and bacterial chromosomes.
  • Analysis of the template-dependent, reverse transcriptase-mediated tropism switching mechanism.

Related Experiment Videos

  • Structural analysis of the C-type lectin fold involved in protein diversification.

    • Main Results:

    • DGRs introduce nucleotide substitutions at specific locations, generating vast protein sequence diversity.
    • The DGR mechanism balances protein diversity with structural stability.
    • Homologous DGRs are found in diverse bacterial species, indicating widespread distribution.
    • DGRs can generate novel binding specificities.

    Conclusions:

    • DGRs are powerful genetic elements that facilitate rapid adaptation in diverse organisms.
    • The cassette-based diversification mechanism offers significant evolutionary advantages.
    • DGRs hold potential for developing novel antimicrobial agents and biotechnological tools.