Brain and muscle ARNT-like protein 1 (BMAL1) (BMAL1)

Brain and muscle ARNT-like protein 1 (BMAL1), encoded by the ARNTL gene, is a master transcription factor and a core component of the mammalian circadian clock (UniProt: P49759). It functions by forming a heterodimer with CLOCK or NPAS2, which binds to E-box sequences in the promoter regions of clock-controlled genes to initiate their transcription (PubMed: 24037396). This molecular oscillator regulates a wide array of physiological processes, including glucose metabolism, lipid homeostasis, and immune responses. Dysregulation of BMAL1 is strongly associated with metabolic disorders, such as obesity and type 2 diabetes, as well as accelerated aging and various forms of cancer (PubMed: 30635457). In the context of pharmacology, BMAL1 is an emerging therapeutic target; small molecules like the natural flavonoid Nobiletin have been shown to enhance its activity, offering potential treatments for metabolic and neurodegenerative diseases (PubMed: 27090315). Additionally, the BMAL1-dependent clock machinery is being explored in chronotherapy to optimize the timing of drug delivery and minimize toxicity (PubMed: 29107506).

Other names

ARNTLMOP3BHLHE5PASD3Member of PAS protein 3Basic helix-loop-helix-PAS protein MOP3

BMAL1 functions by forming a heterodimer with CLOCK or NPAS2 to bind E-box elements (5'-CACGTG-3') in the promoters of clock-controlled genes, thereby driving the rhythmic expression of the molecular clock's primary and secondary feedback loops (PubMed: 24037396).