As inferred from mouse, glucocorticoids bind the glucocorticoid receptor at the promoter of the PER2 gene and enhance rhythmic transcription.
The PERIOD-2 (PER2) gene is transcribed to yield mRNA and the mRNA is translated to yield PER2 protein (Shearman et al. 1997, Nakamura et al. 2008, also inferred from mouse homologs). The promoter of the PER2 gene contains an E-box which binds the BMAL1:CLOCK (ARNTL:CLOCK) heterodimer (and probably also the BMAL1:NPAS2 (ARNTL:NPAS2) heterodimer). The BMAL1:CLOCK heterodimer activates transcription of PER2.
As inferred from mouse homologs, the NFIL3:BHLHE41 heterodimer (E4BP4:DEC2 heterodimer) binds E-box-like elements in the PER2 promoter and represses transcription of PER2 (Ohno et al. 2007, Tanoue et al. 2015).
As inferred from mouse, the phosphorylated BMAL1:CLOCK (ARNTL:CLOCK) heterodimer binds a noncanonical E-box in the promoter of the PER2 gene and activates transcription of PER2. NPAS2 is predicted to act redundantly with CLOCK.