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Related Experiment Videos

Making waves: pattern formation by a cell-surface-associated signal.

Angela Stevens1, Lotte Søgaard-Andersen

  • 1Max Planck Institute for Mathematics in the Sciences, Inselstr. 22-26, 04103 Leipzig, Germany.

Trends in Microbiology
|June 7, 2005
PubMed
Summary
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Starving Myxococcus xanthus cells form patterns using a C-signal. A mathematical model reveals a negative feedback loop explains how C-signalling affects cell reversal frequency, guiding future experiments.

Area of Science:

  • Microbiology
  • Biophysics
  • Mathematical Biology

Background:

  • Starving Myxococcus xanthus cells exhibit complex spatio-temporal organization into rippling or fruiting body formation.
  • Both developmental patterns are regulated by a cell-surface-associated, non-diffusible C-signal.
  • The C-signal modulates cell reversal frequency, a key motility parameter, with distinct effects at low and high signalling levels.

Purpose of the Study:

  • To elucidate the mechanism behind the non-linear relationship between C-signalling levels and cell reversal frequency.
  • To investigate the role of biochemical feedback loops in Myxococcus xanthus pattern formation.
  • To provide a mathematical framework for understanding C-signal-mediated motility regulation.

Main Methods:

  • Analysis of a mathematical model describing the C-signal's effect on cell reversal frequency.

Related Experiment Videos

  • Introduction of a negative feedback loop into the regulatory biochemical circuit.
  • Examination of the resulting oscillatory behavior and its dependence on C-signalling.

    • Main Results:

    • A mathematical model successfully explains the non-linear dependence of reversal frequency on C-signalling.
    • The model incorporates a negative feedback loop in the biochemical circuit regulating reversal frequency.
    • The system exhibits oscillatory behavior where oscillation frequency is non-monotonically related to C-signalling levels.

    Conclusions:

    • The proposed mathematical model, incorporating negative feedback, effectively recapitulates the observed effects of the C-signal on Myxococcus xanthus reversal frequency.
    • The model provides a testable hypothesis for experimental validation by biologists.
    • Understanding this biochemical oscillator is crucial for deciphering the mechanisms of bacterial developmental pattern formation.