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Related Experiment Videos

dsg, a gene required for cell-cell interaction early in Myxococcus development.

Y Cheng1, D Kaiser

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

Journal of Bacteriology
|July 1, 1989
PubMed
Summary

Mutants of Myxococcus xanthus lacking the dsg gene show defects in fruiting body development and sporulation. These dsg mutants can be rescued by wild-type cells, indicating a crucial role for the dsg gene in early development.

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Area of Science:

  • Microbiology
  • Developmental Biology
  • Bacterial Genetics

Background:

  • Myxococcus xanthus exhibits complex multicellular development, including fruiting body formation and sporulation.
  • dsg mutants display conditional defects in these developmental processes, requiring wild-type interaction for completion.

Purpose of the Study:

  • To investigate the developmental defect in dsg mutants of Myxococcus xanthus.
  • To characterize the genetic basis and developmental role of the dsg gene.

Main Methods:

  • Backcrossing of dsg mutants using Tn5 transposon mutagenesis for selection.
  • Comparative analysis of fruiting body morphology and sporulation efficiency between dsg mutants and wild-type.
  • Genetic complementation tests and subcloning to identify and localize the dsg gene.

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Main Results:

  • Backcrossed dsg mutants formed larger, less compact, and less symmetrical aggregates compared to wild-type fruiting bodies.
  • Sporulation in dsg mutant aggregates was delayed and reduced, though inducible by glycerol or DMSO.
  • The dsg gene was cloned and mapped to an 850-base-pair region, with the wild-type allele being dominant.

Conclusions:

  • dsg mutants likely possess a primary defect early in development, impacting aggregation and subsequent sporulation.
  • The dsg gene is essential for normal fruiting body development and sporulation in Myxococcus xanthus.
  • The identified dsg gene represents a key regulator in the early stages of Myxococcus xanthus multicellular development.