The Interplay of Light and the Circadian Clock (Independent Dual Regulation of Clock-Controlled Gene ccg-2(eas)

Aug 1, 1993Plant physiology

How Light and the Body Clock Together Control the Gene ccg-2(eas) in Two Separate Ways

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Abstract

Light regulates the expression of the gene ccg-2(eas) in Neurospora crassa.

  • The gene ccg-2(eas) is controlled by both light and the circadian clock.
  • In wild-type strains, light significantly affects the expression of ccg-2(eas).
  • Mutant strains lacking sensitivity to blue light show no change in ccg-2(eas) mRNA levels when exposed to bright light.
  • In clock-null strains, ccg-2(eas) mRNA is still induced by light, indicating that a functioning circadian oscillator is not necessary for this response.
  • These findings suggest that ccg-2(eas) is regulated by two distinct mechanisms: light exposure and circadian rhythms.

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