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Drosophila clock can generate ectopic circadian clocks.

Jie Zhao1, Valerie L Kilman, Kevin P Keegan

  • 1Howard Hughes Medical Institute, Department of Biology, Brandeis University, Waltham, MA 02454, USA.

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Summary

The transcriptional activator Clock induces circadian gene expression and alters behavior in Drosophila. Misexpression of Clock in naive brain regions organizes core feedback loops essential for circadian rhythms.

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Area of Science:

  • Chronobiology
  • Molecular biology
  • Neurogenetics

Background:

  • Circadian rhythms govern daily cycles in behavior, physiology, and gene expression across organisms.
  • The transcriptional activator Clock is crucial for core clock gene expression in both fruit flies (Drosophila) and mammals.

Purpose of the Study:

  • To investigate the role of Clock misexpression in inducing circadian gene expression and behavioral changes in Drosophila.
  • To determine if Clock can organize the essential feedback loops for circadian rhythms.

Main Methods:

  • Drosophila melanogaster as a model organism.
  • Genetic misexpression of the Clock gene in naive brain regions.
  • Analysis of circadian gene expression patterns.
  • Observation and quantification of locomotor activity.

Main Results:

  • Misexpression of Clock in naive brain regions induced circadian gene expression, including key pacemaker components.
  • Clock activated rhythmic expression of cryptochrome, a gene typically repressed by CLOCK.
  • Ectopic Clock expression significantly altered locomotor activity patterns, demonstrating potent behavioral effects.

Conclusions:

  • Clock possesses the unique ability to induce and organize the core elements of interdependent feedback loops required for circadian rhythms.
  • Clock acts as a master regulator capable of initiating circadian output in previously arrhythmic tissues.