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vrille, Pdp1, and dClock Form a Second Feedback Loop in the Drosophila Circadian Clock
vrille, Pdp1, and dClock create a second feedback loop in the fruit fly's daily biological clock
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Abstract
VRI levels peak 3-6 hours before PDP1 in the Drosophila circadian clock's feedback mechanisms.
- The Drosophila circadian clock consists of two interlocked transcriptional feedback loops.
- dCLOCK/CYCLE activates the expression of the period gene, while PERIOD protein inhibits dCLOCK/CYCLE activity.
- VRI and PDP1 proteins are directly regulated by dCLOCK/CYCLE and are involved in feedback regulation of dClock expression.
- Repression of dClock by VRI is distinct from its activation by PDP1.
- Rhythmic transcription of vri is essential for maintaining molecular rhythms, while a lack of Pdp1 disrupts these rhythms.
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