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What is Phase in Cellular Clocks?

Cristian Caranica1, Jia H Cheong2, Xiao Qiu3

  • 1Department of Statistics, University of Georgia, Athens, GA.

The Yale Journal of Biology and Medicine
|June 29, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces four phase measures to analyze cellular oscillator synchronization using Neurospora crassa data. These methods, including Hilbert phase analysis, help understand biological rhythms and signal processing.

Keywords:
Hilbert PhaseNeurospora crassacircadian rhythmsphasesingle cell measurementssynchronization

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Area of Science:

  • Biophysics
  • Systems Biology
  • Chronobiology

Background:

  • Cellular oscillators exhibit complex dynamics, including circadian rhythms.
  • Understanding phase synchronization is crucial for deciphering biological timing mechanisms.
  • Existing methods may not fully capture the nuances of cellular clock phase.

Purpose of the Study:

  • To introduce and validate four novel phase measures for analyzing cellular oscillator synchronization.
  • To apply these measures to experimental data from Neurospora crassa.
  • To provide tools for studying phase synchronization in biological systems and signal processing.

Main Methods:

  • Development of four inter-related phase measures.
  • Utilizing the Hilbert transform to create a phase-shifted replica of the oscillator signal.
  • Computation and illustration of phase measures on single-cell fluorescence data from Neurospora crassa.

Main Results:

  • The study describes computation of phase shift (ϕ), Hilbert phase (F(t)), and a time-dependent phase measure (M(t1,t0)).
  • Continuous Hilbert phase (F(t)) and phase in cycles (M(t1,t0)) were derived for time-series analysis.
  • Demonstrated application on Neurospora crassa data highlights the utility of these measures.

Conclusions:

  • The developed phase measures offer a robust framework for studying cellular oscillator synchronization.
  • These methods are applicable to signal processing and particularly relevant for circadian rhythm research.
  • Cellular clock phase dynamics differ from macroscopic circadian clocks due to superimposed hourly cycles.