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Related Concept Videos

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Disease-associated KCNMA1 variants decrease circadian clock robustness in channelopathy mouse models.

Ria L Dinsdale1, Cooper E Roache1, Andrea L Meredith1

  • 1Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, USA.

The Journal of General Physiology
|September 20, 2023
PubMed
Summary
This summary is machine-generated.

Gain-of-function mutations in the KCNMA1 gene, encoding the BK channel, impair circadian rhythms in mice. These BK channel alterations reduce rhythm robustness and alter responses to light, impacting daily behavior.

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Genetics

Background:

  • The KCNMA1 gene encodes the large-conductance voltage- and calcium-activated potassium (BK) channel.
  • BK channels regulate neuronal firing and are crucial for circadian behavioral rhythms.
  • Human KCNMA1 channelopathies are linked to neurological disorders, but their impact on circadian function is unknown.

Purpose of the Study:

  • To investigate the effects of human disease-associated KCNMA1 channel variants on circadian behavior in mouse models.
  • To assess whether gain-of-function (GOF) and loss-of-function (LOF) KCNMA1 mutations alter circadian rhythm robustness and light responsiveness.

Main Methods:

  • Generation and behavioral assessment of three mouse lines with distinct KCNMA1 mutations: two GOF (Kcnma1N999S/WT, Kcnma1D434G/D434G) and one LOF (Kcnma1H444Q/H444Q).
  • Locomotor activity monitored using running wheels to analyze circadian parameters like amplitude, period, and rhythmicity.
  • Phase-shifting responses to light pulses evaluated to assess circadian clock sensitivity and re-entrainment to new light:dark cycles.

Main Results:

  • All three mouse models maintained circadian rhythmicity.
  • GOF models (Kcnma1N999S/WT and Kcnma1D434G/D434G) exhibited reduced circadian amplitude and decreased overall activity.
  • GOF models showed enhanced light sensitivity, faster re-entrainment to new light cycles, and altered phase-shifting responses, while the LOF model showed no significant circadian alterations.

Conclusions:

  • Increasing BK channel activity through GOF KCNMA1 variants diminishes circadian clock robustness.
  • Altered BK channel function, specifically GOF, impacts the sensitivity of circadian rhythms to environmental cues like light.
  • These findings highlight the critical role of BK channel activity levels in maintaining stable circadian behavior and suggest potential mechanisms for neurological disorders associated with KCNMA1 channelopathies.