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Plausible, robust biological oscillations through allelic buffering.

Feng-Shu Hsieh1, Duy P M Nguyen1, Mathias S Heltberg2

  • 1Lab for Cell Dynamics, Institute of Molecular Biology, Academia Sinica, Taipei 115, Taiwan.

Cell Systems
|November 6, 2024
PubMed
Summary
This summary is machine-generated.

Robust biological oscillations are crucial for cellular functions. This study reveals that Mdm2 allelic buffering ensures stable p53 oscillations after DNA damage, preventing excessive cell-cycle arrest.

Keywords:
DNA damageMdm2allelic bufferingbiochemical noisecell cycleoscillationsp21p53signaling dynamicsstochasticity

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Systems Biology

Background:

  • Biological oscillators control time- and dose-dependent cellular functions.
  • The mechanisms by which noisy biochemical processes achieve robust oscillations are not fully understood.

Purpose of the Study:

  • To investigate the long-term oscillations of p53 and its regulator Mdm2 in single cells post-DNA damage.
  • To elucidate the role of Mdm2 allelic interactions in maintaining p53 oscillation robustness.

Main Methods:

  • Utilized allelic-specific imaging to monitor Mdm2 activity in single cells.
  • Characterized p53 and Mdm2 oscillatory dynamics after DNA damage.
  • Performed in silico simulations to model the effects of allelic buffering.

Main Results:

  • Mdm2 from a single allele showed unresponsiveness to some p53 pulses.
  • Mdm2 alleles were found to buffer each other, maintaining p53 pulse amplitude.
  • Disruption of Mdm2 allelic buffering led to reduced p53 amplitude robustness, increased p21 levels, and cell-cycle arrest.

Conclusions:

  • Allelic buffering is essential for robust p53 oscillations in response to DNA damage.
  • Allelic buffering enhances the stability of biological oscillators and expands their functional biochemical space.
  • This mechanism highlights the evolutionary importance of allelic buffering for robust biological oscillations.