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The circadian clock is a global regulatory mechanism that controls the expression of 50 to 80% of transcripts in mammals. Some of the genes controlled by the circadian clock are oncogenes or tumor suppressors. Among these Myc has been the focus of several studies which have investigated the effect of clock genes and proteins on Myc transcription and MYC protein stability. Other studies have focused on effects of Myc mutation or overproduction on the circadian clock in comparison to their effects on cell cycle progression and tumorigenesis. Here we have used mice with mutations in the essential clock genes Bmal1, Cry1, and Cry2 to gain further insight into the effect of the circadian clock on this important oncogene/oncoprotein and tumorigenesis. We find that mutation of both Cry1 and Cry2, which abolishes the negative arm of the clock transcription–translation feedback loop (TTFL), causes down-regulation of …