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Updated: May 19, 2026
09:09
Design and Analysis of Temperature Preference Behavior and its Circadian Rhythm in Drosophila
Published on: January 13, 2014
The Case for Kinases: A Phosphorylation Driven Model for Circadian Temperature Compensation
Elizabeth-Lauren Stevenson1, Christina M Kelliher1,2, Arminja N Kettenbach3
1Dept. of Molecular and Systems Biology, Geisel School of Medicine at Dartmouth, Hanover, NH.
Biorxiv : the Preprint Server for Biology
|May 18, 2026
Summary
Organisms use circadian rhythms to adapt to daily environmental changes. This study reveals how Casein Kinase I and II regulate temperature compensation in the Neurospora clock by altering FRQ phosphorylation.
Area of Science:
- Chronobiology
- Molecular Biology
- Biochemistry
Background:
- Circadian rhythms are endogenous biological oscillators synchronized with environmental cycles.
- Temperature compensation is a key property of circadian clocks, maintaining rhythmicity across temperatures.
- In Neurospora, the White Collar Complex (WCC) and FRQ protein form a core oscillator, regulated by phosphorylation.
Purpose of the Study:
- To investigate the roles of Casein Kinase I (CK1a) and Casein Kinase II (CKA) in temperature compensation of the Neurospora circadian clock.
- To elucidate the relationship between these kinases and the FRQ protein in temperature adaptation.
- To develop a model for temperature compensation based on FRQ phosphorylation dynamics.
Main Methods:
- Utilized novel mutant alleles: ck-1aD135G and Δcka.
- Performed quantitative proteomics to analyze FRQ phosphorylation across different temperatures.
- Developed a phosphorylation-driven model for circadian temperature compensation.
Main Results:
- The circadian clock's reliance on CK1a versus CKA shifts with temperature: CK1a is more critical at cold, CKA at warm temperatures.
- FRQ phosphorylation patterns are temperature-dependent and altered in mutants affecting temperature compensation.
- Identified specific FRQ domains crucial for temperature compensation through phosphorylation.
Conclusions:
- CK1a and CKA play distinct, temperature-dependent roles in regulating the Neurospora circadian clock's temperature compensation.
- FRQ phosphorylation is a central mechanism through which temperature compensation is achieved.
- A novel model highlights the dynamic phosphorylation landscape of FRQ in response to temperature variations.
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