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Related Experiment Videos

Specific sequences outside the E-box are required for proper per expression and behavioral rescue.

L C Lyons1, T K Darlington, H Hao

  • 1Department of Biology and Biochemistry, University of Houston, TX, USA.

Journal of Biological Rhythms
|December 6, 2000
PubMed
Summary

The circadian regulatory sequence (CRS) controls daily rhythms in fruit flies. While the E-box is crucial, other DNA regions are also vital for gene expression and behavior.

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Area of Science:

  • Chronobiology
  • Molecular Biology
  • Genetics

Background:

  • Circadian rhythms are essential biological processes regulated by specific genes.
  • The period (per) gene in fruit flies is a key component of the circadian clock.
  • A 69 bp circadian regulatory sequence (CRS) upstream of the per gene is known to control its expression and rhythmicity.

Purpose of the Study:

  • To identify specific DNA sequences within the CRS required for circadian transcription, spatial expression, and behavioral rhythmicity.
  • To investigate the role of the E-box and surrounding sequences in regulating per gene expression.
  • To understand the broader regulatory network influencing circadian gene expression.

Main Methods:

  • Generation of site-directed mutants within the CRS, altering blocks of 3 to 12 nucleotides.

Related Experiment Videos

  • In vivo analysis using lacZ or per gene reporter constructs to assess transcriptional activity.
  • Evaluation of behavioral rhythmicity in fruit flies carrying CRS mutations.

    • Main Results:

    • The E-box within the CRS is essential for high-level per gene expression and normal behavioral rhythmicity.
    • Sequences outside the E-box are also critical for transcriptional activation, proper spatial expression, and behavioral rhythmicity.
    • The functional target site for dCLOCK (dCLK) and CYCLE (CYC) transcription factors extends beyond the canonical E-box.

    Conclusions:

    • The regulation of per gene transcription is complex and involves more than just the E-box.
    • Additional DNA elements within the CRS, in conjunction with the E-box, are necessary for precise circadian control.
    • Factors beyond dCLK and CYC play a significant role in modulating per gene transcription, highlighting a complex regulatory mechanism.