Gene Model 129 ( Gm129) Encodes a Novel Transcriptional Repressor That Modulates Circadian Gene Expression*

Background: Circadian gene expression in mammals is driven by rhythmic CLOCKBMAL1 activities. Results:Gm129 binds to the CLOCKBMAL1 complex on DNA and represses its transcriptional activator activity to regulate the circadian gene expression phase. Conclusion:Gm129 is a novel circadian clock modulator. Significance: The discovery of Gm129 reveals a new regulatory component of circadian gene expression. The mammalian circadian clock is a molecular oscillator composed of a feedback loop that involves transcriptional activators CLOCK and BMAL1, and repressors Cryptochrome (CRY) and Period (PER). Here we show that a direct CLOCKBMAL1 target gene, Gm129, is a novel regulator of the feedback loop. ChIP analysis revealed that the CLOCKBMAL1CRY1 complex strongly occupies the promoter region of Gm129. Both mRNA and protein levels of GM129 exhibit high amplitude circadian oscillations in mouse liver, and Gm129 gene encodes a nuclear-localized protein that directly interacts with BMAL1 and represses CLOCKBMAL1 activity. In vitro and in vivo protein-DNA interaction results demonstrate that, like CRY1, GM129 functions as a repressor by binding to the CLOCKBMAL1 complex on DNA. Although Gm129(-/-) or Cry1(-/-)Gm129(-/-) mice retain a robust circadian rhythm, the peaks of Nr1d1 and Dbp mRNAs in liver exhibit a significant phase delay compared with control. Our results suggest that, in addition to CRYs and PERs, the GM129 protein contributes to the transcriptional feedback loop by modulating CLOCKBMAL1 activity as a transcriptional repressor.