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Related Experiment Videos

dsg, a gene required for Myxococcus development, is necessary for cell viability.

Y Cheng1, D Kaiser

  • 1Department of Biochemistry, Stanford University, California 94305.

Journal of Bacteriology
|July 1, 1989
PubMed
Summary

The dsg gene is essential for Myxococcus xanthus viability and development. Loss-of-function mutations are lethal, but specific point mutations allow normal growth but impair development, indicating distinct roles.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Genetics

Background:

  • The dsg gene in Myxococcus xanthus is known to be crucial for cell-cell interactions.
  • Previous studies indicated that while point mutations in dsg are viable, gene insertions can be lethal.

Purpose of the Study:

  • To investigate the essentiality of the dsg gene in Myxococcus xanthus for both viability and developmental processes.
  • To differentiate the function of the dsg gene during growth versus development.

Main Methods:

  • Analysis of viable point mutations (e.g., dsg-439) and lethal gene insertions (dsg::Tn5).
  • Construction and viability assessment of partial diploid strains (e.g., dsg::Tn5/dsg+).

Main Results:

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  • Haploid insertions of Tn5 within the dsg gene result in lethality.
  • Partial diploid strains carrying both a dsg insertion and a functional or mutated dsg allele are viable.
  • Specific point mutants (dsg-429, dsg-439) exhibit normal growth but are defective in development.

    • Conclusions:

    • The dsg gene is essential for Myxococcus xanthus viability, with loss of function being lethal.
    • The dsg gene plays distinct roles in bacterial growth and multicellular development.
    • The essentiality of dsg is context-dependent, differing between vegetative growth and developmental stages.