Circadian locomotor output cycles protein kaput (CLOCK)

Circadian locomotor output cycles protein kaput (CLOCK) is a core transcription factor in the molecular circadian clock system. It forms a heterodimer with BMAL1, and this complex drives expression of PER and CRY genes by binding E-box elements in target gene promoters, generating the feedback loops that maintain circadian rhythms in mammalian physiology[1][2]. CLOCK is also a histone acetyltransferase, providing chromatin-regulatory functions that are essential for rhythmic gene transcription[1]. Its activity modulates processes such as sleep/wake timing, hormone secretion, metabolism, inflammation, DNA repair, and the cell cycle[2]. Dysfunction of CLOCK has been linked to cancer, neurodegeneration, cardiovascular and metabolic diseases, and inflammatory pathologies[2]. Drugs directly targeting CLOCK are experimental, but manipulation of its pathway has potential therapeutic utility; however, risks include widespread biological disruption given its centrality to human physiology[2].

Other names

CLOCKBHLHE8KIAA0334KAT13DhCLOCKbHLHe8class E basic helix-loop-helix protein 8

Direct or indirect inhibition of CLOCK/BMAL1 activity; Modulation of transcription or acetylation activity affecting downstream circadian output