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Updated: Jul 23, 2025

Blastomere Explants to Test for Cell Fate Commitment During Embryonic Development
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A bistable autoregulatory module in the developing embryo commits cells to binary expression fates.

Jiaxi Zhao1, Mindy Liu Perkins2, Matthew Norstad3

  • 1Department of Physics, University of California, Berkeley, Berkeley, CA 94720, USA.

Current Biology : CB
|July 15, 2023
PubMed
Summary

This study shows that the fushi tarazu (ftz) gene autoregulatory module in fruit flies is bistable, confirming how autoregulation establishes developmental cell fates. Quantitative modeling and live imaging reveal how this bistability drives binary cell fate decisions during embryonic development.

Keywords:
Drosophila melanogasterautoactivationbinary cell decision-makingbistabilitydevelopmentdynamical systemsfushi tarazulive imagingmathematical modelingtranscriptional dynamics

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Area of Science:

  • Developmental Biology
  • Systems Biology
  • Genetics

Background:

  • Bistable autoactivation is hypothesized to control binary cell fate decisions in embryonic development.
  • Quantitative determination of parameters is crucial to confirm bistability in gene regulatory networks.

Purpose of the Study:

  • To investigate the bistable dynamics of the fruit fly pair-rule gene fushi tarazu (ftz) using live imaging and mathematical modeling.
  • To quantitatively determine the parameters of the ftz autoregulatory module and confirm its role in binary cell fate determination.

Main Methods:

  • In vivo live imaging of transcription and protein concentration in fruit fly blastoderm.
  • Development of a dynamical systems model with parameters quantified from experimental measurements.
  • In silico analysis to determine the timing of fate commitment by the autoregulatory element.

Main Results:

  • Ftz cell fate determination transitions from an early, non-autoregulating element to an autoregulatory element.
  • Ftz concentration alone does not activate the autoregulatory element; temporal responsiveness is required.
  • The ftz autoregulatory module is confirmed to be bistable, with the early element providing a transient signal for commitment.

Conclusions:

  • Autoregulation establishes developmental cell fates through bistability, as demonstrated by the ftz gene.
  • The ftz autoregulatory element rapidly commits the cell fate within 35 minutes of receiving the initial signal.
  • This work provides a quantitative framework for dissecting cellular decision-making processes in development.