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The transcription factors BMAL1 and CLOCK drive the circadian transcription of clock and clock-controlled genes, such as Dbp. To investigate the kinetics of BMAL1 binding to target genes in real time, we generated a cell line harboring tandem arrays of Dbp repeats and monitored the binding of a fluorescent BMAL1 fusion protein to these arrays by time-lapse microscopy. BMAL1 occupancy at the Dbp locus...
REV-ERB nuclear receptors have been believed to stabilize the circadian clock machinery through an accessory but dispensable feedback loop. Recent work now challenges this assumption by demonstrating that REV-ERBs are essential core clock components, in addition to serving as pivotal regulators of rhythmic metabolism.
Interactions of transcription factors with chromatin are highly dynamic. Now Voss et al. (2011) demonstrate that two transcription factors with identical DNA-binding specificities do not compete for occupancy at a given DNA element, but instead, one factor can even facilitate the binding of another. This assisted loading probably involves chromatin-remodeling machines.
The mammalian circadian timing system is composed of a central pacemaker in the suprachiasmatic nucleus of the brain that synchronizes countless subsidiary oscillators in peripheral tissues. The rhythm-generating mechanism is thought to rely on a feedback loop involving positively and negatively acting transcription factors. BMAL1 and CLOCK activate the expression of Period (Per) and Cryptochrome...
amnesiac mutant flies have an olfactory memory defect. The amn gene encodes a homolog of vertebrate pituitary adenylate cyclase-activating peptide (PACAP), and it is strongly expressed in dorsal paired medial (DPM) neurons. DPM neurons ramify throughout the mushroom bodies in the adult fly brain, and they are required for stable memory. Here, we show that DPM neuron output is only required during...
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