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Probing the circadian pacemaker of a mouse using two light pulses.

V K Sharma1, R Chidambaram, M K Chandrashekaran

  • 1Evolutionary and Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, Karnataka, India.

Journal of Biological Rhythms
|February 17, 2000
PubMed
Summary
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This study investigated how light pulses affect the activity rhythms of mice. Results show that transient cycles following light exposure do not accurately reflect the underlying circadian pacemaker

Area of Science:

  • Chronobiology
  • Animal Behavior
  • Circadian Rhythms

Background:

  • The locomotor activity rhythm in nocturnal rodents is governed by a circadian pacemaker.
  • Understanding how this pacemaker responds to external stimuli like light is crucial for chronobiology.

Purpose of the Study:

  • To investigate the phase response curve (PRC) of the circadian pacemaker in Mus booduga using two light pulses (LPs).
  • To compare the PRC generated by two LPs with a single LP PRC.
  • To determine if transient cycles accurately reflect the state of the pacemaker oscillator.

Main Methods:

  • Two sets of experiments were conducted on Mus booduga.
  • In the first set, a resetting LP1 perturbed the circadian pacemaker, followed by a probing LP2 to generate an LP2 PRC, which was compared to a single LP PRC.

Related Experiment Videos

  • In the second set, LP1 was administered, and LP2 was applied at different times during the subsequent transient cycle to assess its effect on steady-state phase shifts.

    • Main Results:

    • The LP2 PRC showed a resemblance to the single LP PRC but was phase-shifted.
    • The LP1 PRC exhibited smaller delay zones compared to the single LP PRC, suggesting rapid pacemaker phase shifts.
    • Steady-state phase shifts were correlated differently with day 1 phase shifts depending on LP2 timing, indicating transient cycles do not mirror pacemaker state.

    Conclusions:

    • The circadian pacemaker in Mus booduga exhibits rapid phase shifts following light perturbations.
    • The phase response curve generated by two light pulses provides insights into pacemaker dynamics.
    • Transient cycles following perturbations do not reliably represent the underlying state of the circadian pacemaker oscillator.