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. Author manuscript; available in PMC: 2014 Mar 20.
Published in final edited form as: Nat Commun. 2013;4:2444. doi: 10.1038/ncomms3444

Figure 6. Model of p53 repression of Per2 expression and modulation of the circadian clock.

Figure 6

p53 levels are regulated by many factors such as circadian timing, cellular stress, and MDM2. Both physiological and stress induced p53 binds to the p53 response element of Per2 promoter which overlaps with the BMAL1 / CLOCK binding site (E-box) and suppresses BMAL1 / CLOCK mediated transcription of Per2 thereby modulating the circadian clock.