Bmal1:Clock (Arntl:Clock) and Bmal1:Npas2 (Arntl:Npas2) heterodimers bind E-box elements (consensus CACGTG) in the promoters of target genes. Two E-box elements separated by 6 bp are sufficient to confer circadian transcription on a reporter gene. The Rev-erba (Nr1d1) promoter has an E-box and is regulated by Bmal1:Clock. Regulation by Bmal1:Npas2 has also been demonstrated, leading to the conclusion that Clock and Npas2 are at least partially redundant.
Antoch, MP, Kakizawa, T, Safi, R, Laudet, V, Triqueneaux, G, Delaunay, F, Takahashi, JS, Thenot, S
Albrecht, U, Schibler, U, Preitner, N, Zakany, J, Damiola, F, Duboule, D, Lopez-Molina, L
Reppert, SM, DeBruyne, JP, Weaver, DR
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