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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells
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Biological clocks.

N Ishida1, M Kaneko, R Allada

  • 1Ishida Group of Clock Gene, National Institute of Bioscience and Human Technology, Agency of Industrial Science and Technology, Ministry of International Trade and Industry, 1-1 Higashi, Tsukuba Science City, Ibaraki 305 Japan. nishida@nibh.go.jp

Proceedings of the National Academy of Sciences of the United States of America
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Summary
This summary is machine-generated.

This study explores conserved genes and molecular mechanisms underlying circadian rhythms in flies and humans. It highlights key transcription factors that regulate daily biological cycles, offering insights into common clock functions across species.

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Area of Science:

  • Chronobiology
  • Molecular Biology
  • Genetics

Background:

  • Circadian rhythms are endogenous biological processes with a ~24-hour cycle, influencing physiological functions like sleep-wake cycles, hormone release, and body temperature.
  • These rhythms are crucial for maintaining homeostasis and are conserved across diverse species, from insects to mammals.
  • Understanding the genetic basis of circadian rhythms is key to deciphering biological clock mechanisms.

Purpose of the Study:

  • To identify conserved genes responsible for circadian behavior across different species.
  • To elucidate the common molecular mechanisms governing biological clocks in flies and humans.
  • To highlight the role of specific transcription factors (switch genes) in regulating circadian rhythm genes.

Main Methods:

  • Comparative genomic analysis to identify common genes between species.
  • Review of research from three laboratories focusing on circadian clock mechanisms.
  • Analysis of transcription factor networks involved in circadian rhythm regulation.

Main Results:

  • Identified conserved genes that dictate circadian behavior in both flies and humans.
  • Detailed the molecular clockwork, emphasizing shared regulatory pathways.
  • Highlighted the critical function of specific transcription factors in orchestrating circadian gene expression.

Conclusions:

  • A common molecular framework underlies circadian rhythms in distantly related species like flies and humans.
  • Transcription factors play a pivotal role as 'switch genes' in the regulation of circadian biology.
  • This research provides fundamental insights into the evolution and conservation of biological clocks.