Circadian-associated transcriptional repressor (Ciart or Chrono) is a negative regulatory component of the circadian clock. It functions as a transcriptional repressor, modulating BMAL1-CLOCK activity. It also regulates metabolic pathways such as the glucocorticoid response triggered by behavioral stress [1, 2, 3].

1: Gene model 129 (Gm129) encodes a novel transcriptional repressor that modulates circadian gene expression. Annayev Y, Adar S, Chiou YY, Lieb JD, Sancar A, Ye R; J Biol Chem. 2014;289:5013-5024. PMID:24385426

2: A novel protein, CHRONO, functions as a core component of the mammalian circadian clock. Goriki A, Hatanaka F, Myung J, Kim JK, Yoritaka T, Tanoue S, Abe T, Kiyonari H, Fujimoto K, Kato Y, Todo T, Matsubara A, Forger D, Takumi T; PLoS Biol. 2014;12:e1001839. PMID:24736997

3: Machine learning helps identify CHRONO as a circadian clock component. Anafi RC, Lee Y, Sato TK, Venkataraman A, Ramanathan C, Kavakli IH, Hughes ME, Baggs JE, Growe J, Liu AC, Kim J, Hogenesch JB; PLoS Biol. 2014;12:e1001840. PMID:24737000