{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n ARNTL (also known as BMAL1) is a core transcription factor of the mammalian circadian clock that forms heterodimers with partners such as CLOCK or NPAS2 to drive rhythmic transcription of numerous clock‐controlled genes via E‐box elements. Its activity is central to the generation and maintenance of circadian oscillations, thereby coordinating diverse physiologic processes. For example, ARNTL plays an essential role in regulating insulin secretion and glucose homeostasis in pancreatic islets, liver gluconeogenesis, and adipocyte energy metabolism; disruption of ARNTL in these tissues leads to metabolic disturbances including diabetes, altered lipid profiles, and obesity"}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "and."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " ARNTL also maintains cellular redox balance and neural integrity, with its loss promoting premature aging, oxidative damage and neurodegeneration."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " Moreover, ARNTL is tightly regulated by an array of nuclear receptors and coregulators – for instance, REV-ERBα and heme act to repress ARNTL transcription"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": "while RORα and PGC-1α stimulate its expression to reinforce circadian amplitude."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " Post-translational modifications of ARNTL—including acetylation by CLOCK and selective degradation via autophagy (a process termed “clockophagy”) that modulates its cellular levels—further fine-tune circadian timing and have been linked to processes such as ferroptosis in cancer cells."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " In immune cells, ARNTL contributes to the temporal gating of inflammatory responses, and its function in the central nervous system appears to impact mood and dopamine metabolism."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Finally, genetic polymorphisms in ARNTL have been associated with components of the metabolic syndrome such as hypertension and type 2 diabetes, underscoring its broad physiologic and pathophysiologic relevance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": " Collectively, these studies reveal that ARNTL functions as an essential circadian regulator whose proper expression and timing are critical for synchronizing metabolism, cellular redox status, immune responses, neurobehavioral function, and cell death.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Biliana Marcheva, Kathryn Moynihan Ramsey, Ethan D Buhr, et al. 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