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INHIBITION BY BACTERIA OF PSEUDOPLASMODIUM FORMATION OF DICTYOSTELIUM DISCOIDEUM.

A Ishikawa1, M Takagi1, T Tateishi1

  • 1Biological Institute, Faculty of Science, Shizuoka University, Oya 836, Shizuoka 422, Japan.

Development, Growth & Differentiation
|June 7, 2023
PubMed
Summary
This summary is machine-generated.

A temperature-sensitive Dictyostelium discoideum mutant

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Area of Science:

  • Cellular and developmental biology
  • Microbiology
  • Biochemistry

Background:

  • Dictyostelium discoideum serves as a model organism for studying cellular differentiation and development.
  • Bacterial associates can influence the developmental pathways of D. discoideum.
  • Previous research identified bacterial factors affecting D. discoideum development.

Purpose of the Study:

  • To investigate the effect of a bacterial factor on Dictyostelium discoideum development at different temperatures.
  • To characterize the stage of development inhibited by the bacterial factor.
  • To determine the nature of the temperature-sensitive mutation.

Main Methods:

  • Isolation and culture of a temperature-sensitive Dictyostelium discoideum mutant.
  • Culturing the mutant with bacterial associates at permissive (18.5°C) and non-permissive (26°C) temperatures.
  • Temperature-shift experiments to pinpoint the inhibited developmental stage.
  • Assessing the effect of the bacterial factor on pseudoplasmodium and tip formation.

Main Results:

  • The mutant's development was normal at 18.5°C but arrested at the aggregate stage at 26°C when co-cultured with bacteria.
  • A bacterial factor likely inhibits pseudoplasmodium formation, with its inactivation being temperature-sensitive in the mutant.
  • The bacterial inhibitor acts prior to tip formation, as indicated by temperature-shift experiments.
  • This inhibitor appears distinct from previously reported bacterial factors due to observed synergism.

Conclusions:

  • A novel bacterial inhibitor affects Dictyostelium discoideum development by targeting a stage just before tip formation.
  • The mutant's temperature sensitivity is linked to the inactivation of this bacterial inhibitor.
  • Further research is needed to elucidate the precise molecular mechanisms of this interaction.