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Functional requirements of cellular differentiation: lessons from Bacillus subtilis
Jatin Narula1, Masaya Fujita2, Oleg A Igoshin1
1Department of Bioengineering and Center for Theoretical Biological Physics, Rice University, United States.
Current Opinion in Microbiology
|August 9, 2016
Summary
Bacillus subtilis utilizes complex gene regulatory networks for robust cell differentiation. These networks enable ultrasensitive responses to environmental cues, ensuring proper cell fate decisions like sporulation.
Area of Science:
- Microbiology
- Systems Biology
- Molecular Biology
Background:
- Cell differentiation requires cells to interpret internal and external signals for appropriate gene expression.
- The Bacillus subtilis sporulation network serves as a model for understanding complex cellular decision-making processes.
Purpose of the Study:
- To review the Bacillus subtilis sporulation network's mechanisms for responding to cellular cues.
- To identify generalizable principles from this network applicable to other biological systems.
Main Methods:
- Review of existing literature on Bacillus subtilis sporulation.
- Analysis of gene regulatory network structures, including feedforward loops and transcriptional feedback.
- Examination of the coordination between sporulation and DNA replication.
Main Results:
- Feedforward loops enable ultrasensitive, threshold-like responses in gene regulation.
- Gene arrangement and feedback loops coordinate sporulation decisions with DNA replication.
- Cells assess starvation by responding to growth rate changes, not specific metabolites, activating the master regulator.
Conclusions:
- The Bacillus subtilis sporulation network exhibits robust design features for reliable cell fate determination.
- These features, including ultrasensitivity and coordination with replication, are potentially generalizable to other differentiation systems.
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