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Asynchronous oscillations of two zebrafish CLOCK partners reveal differential clock control and function
N Cermakian1, D Whitmore, N S Foulkes
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Université Louis Pasteur, B. P. 163, 67404 Illkirch-Strasbourg, France.
Summary
Researchers identified two zebrafish BMAL1 (brain and muscle arylhydrocarbon receptor nuclear translocator-like protein 1) homologs, zfBMAL1 and zfBMAL2, which interact with zebrafish CLOCK. These homologs exhibit distinct expression patterns, suggesting specialized roles in peripheral circadian clocks.
Area of Science:
- Chronobiology
- Molecular Biology
- Genetics
Background:
- Circadian rhythms are regulated by clock genes, often transcription factors.
- Zebrafish (zf) CLOCK interacts with partners to control clock function.
Purpose of the Study:
- To identify and characterize partners of zebrafish CLOCK.
- To investigate the roles of novel CLOCK partners in circadian regulation.
Main Methods:
- Two-hybrid system to identify CLOCK partners.
- Analysis of gene expression patterns in various tissues.
Main Results:
- Two CLOCK partners, zfBMAL1 and zfBMAL2, were identified.
- Both zfBMAL1 and zfBMAL2 contain conserved domains but differ in transcriptional activation potential.
- Expression of zfBmal1 and zfBmal2 oscillates in most tissues, with distinct patterns across tissues and between the two genes.
Conclusions:
- Zebrafish possess two BMAL1 homologs with potentially distinct circadian functions.
- These findings suggest independent peripheral oscillators and differential interpretation of central clock signals.