{"gene":"PER1","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":1997,"finding":"RIGUI/PER1 encodes a bHLH/PAS domain protein 44% homologous to Drosophila PERIOD and is expressed in a circadian pattern in the suprachiasmatic nucleus (SCN); circadian expression persists in constant darkness and shifts proportionally with light/dark cycle changes, establishing it as a mammalian ortholog of the Drosophila period gene involved in circadian clock regulation.","method":"cDNA cloning, sequence homology analysis, in situ hybridization in SCN under constant darkness and shifted light/dark cycles","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — original cloning with multiple orthogonal methods (sequence analysis, circadian expression mapping, light-response assay), foundational paper replicated across the field","pmids":["9323128"],"is_preprint":false},{"year":2004,"finding":"Circadian and light-induced transcription of Per1 depends on histone acetylation/deacetylation: CRY1 represses Per1 transcription by recruiting HDACs and mSin3B; light pulses induce rapid histone H3/H4 acetylation at the Per1 promoter in the SCN; HDAC inhibitor TSA induces endogenous Per1 expression and histone acetylation; phospho-CREB binds the CRE element of Per1 after light exposure.","method":"ChIP assay (histone acetylation at Per1 promoter), HDAC inhibitor (TSA) treatment, luciferase reporter assays, lateral ventricle TSA administration in vivo, co-immunoprecipitation of CRY1 with HDACs/mSin3B","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (ChIP, pharmacological inhibition, in vivo administration, co-IP) in single study with clear mechanistic output","pmids":["15226430"],"is_preprint":false},{"year":1999,"finding":"Per1 expression in the pars tuberalis (PT) encodes photoperiodic time via melatonin-regulated amplitude: both long and short photoperiods produce a transient Per1 peak at ZT3 in the PT, but the amplitude is greatly attenuated under short photoperiod, demonstrating that melatonin signal duration controls Per1 amplitude rather than phase in this tissue.","method":"In situ hybridization of Per1 mRNA in PT under long/short photoperiods in Syrian hamsters; comparison of peak timing and amplitude","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, in situ hybridization with careful photoperiod manipulation, replicated across conditions but single method","pmids":["10449798"],"is_preprint":false},{"year":2001,"finding":"PER1 protein physically interacts with HIF-1α (the alpha subunit of hypoxia-inducible factor 1) as shown by co-immunoprecipitation; hypoxia increases PER1 and CLOCK protein levels in mouse brain; a predominantly nuclear 48 kDa PER1 isoform follows a daily rhythm in mouse brain, while a 55 kDa form is found in kidney.","method":"Co-immunoprecipitation of PER1 and HIF-1α, subcellular fractionation, Western blot with tissue-specific and temporal analysis","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, single co-IP experiment demonstrating PER1–HIF-1α interaction; fractionation data support nuclear localization","pmids":["11726537"],"is_preprint":false},{"year":2022,"finding":"PER1 acts as a scaffold for CK1 in the circadian feedback mechanism: residues essential for PER-CK1 interaction were identified; their mutation abolishes PER phosphorylation and CLOCK hyperphosphorylation, resulting in PER stabilization and arrhythmic PER abundance, impairing negative feedback. Paradoxically, mutant mice show robust short-period locomotor rhythms, indicating the clock can function independently of PER phosphorylation and abundance rhythms via a PER-CRY-dependent feedback mechanism; period length is uncoupled from PER stability.","method":"Mutagenesis of PER-CK1 interaction residues, cellular assays, generation and analysis of mutant mice (locomotor activity, molecular rhythms), phosphorylation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with in vivo mouse model and multiple molecular/behavioral readouts in a single rigorous study","pmids":["35810166"],"is_preprint":false},{"year":2016,"finding":"Per1 overexpression in cholangiocarcinoma cells decreases cell proliferation, induces apoptosis, lowers G2/M arrest, and reduces tumor growth in vivo; Per1 is a direct target of miR-34a, which rhythmically oscillates in cholangiocarcinoma cells; inhibition of miR-34a also decreases proliferation and invasion; mRNA profiling shows Per1 overexpression regulates cell cycle, growth, and apoptosis pathways.","method":"Per1 overexpression constructs, in vitro proliferation/apoptosis/cell cycle assays, in vivo xenograft tumor growth, miRNA target validation, mRNA profiling","journal":"Journal of hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO/OE with defined cellular phenotype plus in vivo validation and miRNA target identification, single lab","pmids":["26923637"],"is_preprint":false},{"year":2021,"finding":"PER1 suppresses glycolysis and cell proliferation in oral squamous cell carcinoma (OSCC) by forming a PER1/RACK1/PI3K protein complex: co-immunoprecipitation showed PER1 binds RACK1 and PI3K; PER1 overexpression increased complex abundance and decreased PI3K half-life (accelerating PI3K degradation), inhibiting PI3K/AKT signaling and glycolysis; these effects were reversed by PER1 mutation. In vivo tumorigenicity assays confirmed that PER1 overexpression suppresses tumor growth.","method":"Co-immunoprecipitation, cycloheximide chase (protein stability), stable OE/KD/mutation cell lines, AKT activator/inhibitor rescue experiments, glycolysis inhibitor experiments, in vivo xenograft assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — co-IP, CHX chase, mutagenesis, pharmacological rescue, and in vivo validation within a single study by one lab; multiple orthogonal methods","pmids":["23723221"],"is_preprint":false},{"year":2021,"finding":"Per1 and Per2 are required for proper myoblast differentiation and muscle regeneration: depletion of Per1 or Per2 suppressed myoblast differentiation in vitro and muscle regeneration in vivo (nonredundant functions). Both Per1 and Per2 activate Igf2 transcription (an autocrine promoter of myoblast differentiation) via Per-dependent RNA polymerase II recruitment, dynamic histone modifications at the Igf2 promoter and enhancer, and promoter-enhancer interaction. Muscle regeneration is faster when initiated at night when Per1, Per2, and Igf2 are highly expressed.","method":"siRNA depletion in vitro, in vivo muscle regeneration assay, ChIP (H3K4me3, H3K27ac, RNA Pol II at Igf2 locus), chromosome conformation capture (promoter-enhancer interaction), diurnal timing experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (siRNA, in vivo regeneration, ChIP, 3C) demonstrating Per1 mechanistic role in Igf2 activation and myogenesis","pmids":["34009269"],"is_preprint":false},{"year":2019,"finding":"The circadian gene PER1 senses progesterone signaling during human endometrial decidualization: the progesterone receptor (PR) directly binds the PER1 promoter to activate its transcription at the onset of stromal proliferation-differentiation transition; PER1 knockout significantly attenuated decidual transformation by expediting FOXO1 protein degradation and downregulating PR target genes.","method":"ChIP (PR binding to PER1 promoter), PER1 knockout in human endometrial stromal cells, decidualization assays, FOXO1 protein stability analysis, RT-PCR","journal":"The Journal of endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct PR-PER1 promoter binding, KO with specific phenotypic readout (FOXO1 degradation, decidualization), multiple methods in single study","pmids":["31518992"],"is_preprint":false},{"year":2022,"finding":"In trastuzumab-resistant HER2-positive gastric cancer, PER1 forms a transcriptional complex with PPARγ that drives circadian oscillation of HK2 (hexokinase 2)-dependent glycolysis; silencing PER1 disrupts PER1-HK2 circadian rhythm and reverses trastuzumab resistance; metformin, which inhibits glycolysis and PER1, combined with trastuzumab at ZT6, improved trastuzumab efficacy.","method":"PER1 silencing in vitro and in vivo, circadian glycolysis measurements (ZT6 vs ZT18), co-immunoprecipitation/transcriptional complex assay (PPARγ-PER1), combinatorial drug treatment with metformin","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro experiments with PER1 silencing and mechanistic complex identification, single lab","pmids":["35255118"],"is_preprint":false},{"year":2021,"finding":"PER1 physically interacts with p53 to reduce p53 stability and impair its transcriptional activity; conversely, p53 represses PER1 transcription (mutual negative cross-regulation); PER1 reduced sensitivity of cancer cells to drug-induced apoptosis both in vitro and in vivo in xenograft mouse models.","method":"Co-immunoprecipitation (PER1-p53 physical interaction), p53 stability and transcription assays, in vitro apoptosis assays with anticancer drugs, in vivo NSG mouse xenograft model","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal regulatory relationship shown by co-IP and transcription assays, supported by in vivo xenograft; single lab","pmids":["33804124"],"is_preprint":false},{"year":2021,"finding":"PER2 acts as a co-factor of CREB to facilitate light/forskolin-induced transcription of Per1: PER2 modulates the interaction between CREB and its co-regulator CRTC1, supporting complex formation only after stimulus; absence of PER2 abolished CBP-CREB interaction, reduced histone H3 acetylation, and decreased RNA Pol II recruitment to the Per1 gene.","method":"In vitro and in vivo (mouse) approaches; co-immunoprecipitation (CREB-CRTC1-CBP complex), ChIP (H3K9ac, RNA Pol II at Per1), Per2 knockout mice, light/forskolin stimulation","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of CREB/CRTC1/CBP complex, ChIP at Per1 locus, PER2 KO mice; mechanistic regulation of Per1 induction established in single lab with multiple methods","pmids":["34741086"],"is_preprint":false},{"year":2020,"finding":"A cAMP response element (CRE) in the Per1 promoter is necessary for light-induced Per1 expression in the SCN at night: CRE-deleted mice showed blunted light-induced Per1 mRNA expression in the SCN, establishing the CRE as the functional element mediating CREB-dependent Per1 induction by light.","method":"CRISPR/knock-in generation of CRE-deleted mice in Per1 and Per2 promoters, in situ hybridization of Per1/Per2 mRNA after light pulse, behavioral rhythm analysis","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vivo promoter deletion (CRE element) with direct molecular readout (Per1 expression) and behavioral controls; genetic approach with specific phenotypic validation","pmids":["32807491"],"is_preprint":false},{"year":2007,"finding":"Estradiol (E2) and progesterone (P4) upregulate Per1 expression in rat uterus in a compartment-specific manner: E2 induces Per1 in luminal epithelium, glandular epithelium, and myometrium; P4 induces Per1 in luminal epithelium, glandular epithelium, and stroma; these effects are blocked by antagonists ICI182780 (anti-estrogen) and RU486 (anti-progestin), establishing steroid hormone-receptor-dependent regulation of Per1.","method":"Ovariectomized rat model, steroid hormone administration, in situ hybridization and immunofluorescence, receptor antagonist experiments, RT-PCR in cultured uterine stromal cells","journal":"The Journal of endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — hormone administration and pharmacological receptor blockade with in situ hybridization, multiple uterine compartments analyzed; single lab","pmids":["17761890"],"is_preprint":false},{"year":2023,"finding":"Local knockdown of Per1 within the dorsal hippocampus (DH) impairs spatial memory consolidation without affecting circadian rhythm or sleep behavior, demonstrating that Per1 functions independently within the DH to regulate memory consolidation in a diurnal manner; learning-induced Per1 oscillates in tandem with memory performance in the hippocampus.","method":"Hippocampus-specific Per1 knockdown (local injection), Object Location Memory task at multiple time points across day/night cycle, RNA-sequencing, analysis of diurnal Per1 oscillation in DH","journal":"Neuropsychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — region-specific KD with defined behavioral phenotype (memory consolidation) and RNA-seq; single lab","pmids":["37264172"],"is_preprint":false},{"year":2022,"finding":"Per1/Per2 double knockout (DKO) reduces testosterone synthesis and impairs fertility in elderly male mice by downregulating steroid hormone synthesis enzymes (Cyp11a1, Cyp17a1, Hsd17b3, Hsd3b1, StAR) in the PKA-StAR pathway; Western blot showed reduced StAR, p-CREB, PKA, and AC1 in testicular tissue of DKO mice, linking circadian clock disruption to impaired steroidogenesis.","method":"Per1/Per2 DKO mouse model, hormone-targeted metabolomics (plasma testosterone), transcriptomic analysis of testis, Western blot (StAR, p-CREB, PKA, AC1), sperm motility assay","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with metabolomic, transcriptomic, and protein-level mechanistic data; note this is Per1/Per2 combined KO so Per1-specific contribution is not isolated","pmids":["35806403"],"is_preprint":false},{"year":2014,"finding":"In Drosophila, PDF neuropeptide increases cAMP and PKA activity to stabilize PER protein: increasing cAMP/PKA stabilizes PER in S2 cells and in fly circadian neurons; PDF applied to fly brains in vitro similarly stabilizes PER; the per(S) mutant (short half-life PER) ameliorates pdf-null phenotypes, placing PDF-cAMP-PKA upstream of PER stability in setting circadian period.","method":"Genetic epistasis (per(S) suppressor of pdf-null), cell-based PER stability assays in S2 cells with PKA manipulation, ex vivo brain PDF application, immunostaining of PER in circadian neurons","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Drosophila ortholog study; genetic epistasis plus in vitro/ex vivo PER stability assays; single lab but multiple orthogonal approaches","pmids":["24707054"],"is_preprint":false}],"current_model":"PER1 is a bHLH/PAS domain transcriptional repressor that forms the core negative feedback loop of the mammalian circadian clock: it is transcriptionally induced by CLOCK/BMAL1 (via E-box elements), and light-induced expression requires a CRE element in its promoter activated by CREB/CRTC1/CBP (with PER2 as co-factor), while its rhythmic expression depends on histone acetylation/deacetylation dynamics; CK1 binds PER1 (using identified PER residues) to phosphorylate it and promote its degradation, thereby regulating period length; PER1 also forms functional complexes with RACK1/PI3K (suppressing glycolysis via PI3K/AKT in cancer), with p53 (mutual negative regulation affecting apoptosis sensitivity), and with PPARγ (driving circadian HK2 oscillation), and it locally controls hippocampal memory consolidation and myoblast differentiation (via Igf2 activation with histone remodeling at the Igf2 locus) in addition to its SCN-based role in circadian pacemaking."},"narrative":{"mechanistic_narrative":"PER1 is a bHLH/PAS domain protein that constitutes a core component of the mammalian circadian negative feedback loop, expressed rhythmically in the suprachiasmatic nucleus where its oscillation persists in constant darkness and entrains to light/dark cycles [PMID:9323128]. Its transcription is gated by chromatin dynamics and light-responsive promoter elements: CRY1 represses Per1 by recruiting HDACs and mSin3B, while light pulses drive rapid histone H3/H4 acetylation and phospho-CREB binding at the Per1 promoter [PMID:15226430], and a CRE element is required in vivo for light-induced Per1 expression in the SCN [PMID:32807491], with PER2 acting as a CREB co-factor that stabilizes the CREB-CRTC1-CBP complex to enable stimulus-dependent Per1 induction [PMID:34741086]. At the protein level PER1 serves as a scaffold for casein kinase 1, and disrupting the PER-CK1 interaction abolishes PER phosphorylation and CLOCK hyperphosphorylation and stabilizes PER, though core rhythmicity can persist via PER-CRY-dependent feedback independent of PER abundance rhythms [PMID:35810166]. Beyond the central clock, PER1 functions as a tissue-level regulator of proliferation and metabolism in cancer, suppressing tumor growth by forming a PER1/RACK1/PI3K complex that accelerates PI3K degradation and inhibits PI3K/AKT-driven glycolysis [PMID:23723221], by physically engaging p53 in mutual negative cross-regulation that modulates apoptosis sensitivity [PMID:33804124], and by partnering with PPARγ to drive circadian HK2-dependent glycolysis [PMID:35255118]. PER1 additionally controls developmental and physiological programs through chromatin-based transcriptional activation, promoting myoblast differentiation and muscle regeneration via Pol II recruitment and histone remodeling at the Igf2 locus [PMID:34009269], supporting human endometrial decidualization downstream of progesterone receptor [PMID:31518992], and regulating hippocampal spatial memory consolidation locally and independently of its circadian role [PMID:37264172].","teleology":[{"year":1997,"claim":"Established that a mammalian period ortholog exists and operates as a circadian-regulated gene, defining the molecular entry point for the mammalian clock.","evidence":"cDNA cloning, sequence homology to Drosophila PERIOD, and in situ hybridization in SCN under constant darkness and shifted light/dark cycles","pmids":["9323128"],"confidence":"High","gaps":["Protein-level partners and repressor mechanism not yet defined","Does not address how light entrains Per1 transcription"]},{"year":1999,"claim":"Showed that Per1 in the pars tuberalis encodes photoperiodic information through amplitude rather than phase, extending its role to seasonal timing.","evidence":"In situ hybridization of Per1 mRNA in pars tuberalis under long/short photoperiods in Syrian hamsters","pmids":["10449798"],"confidence":"Medium","gaps":["Single method (in situ hybridization)","Molecular link from melatonin signaling to Per1 amplitude not resolved"]},{"year":2001,"claim":"First linked PER1 to hypoxia signaling by demonstrating a physical interaction with HIF-1α and tissue-specific PER1 isoforms.","evidence":"Co-immunoprecipitation of PER1 and HIF-1α, subcellular fractionation, and temporal/tissue Western blots in mouse brain and kidney","pmids":["11726537"],"confidence":"Medium","gaps":["Single co-IP without reciprocal validation","Functional consequence of PER1-HIF-1α interaction not established"]},{"year":2004,"claim":"Defined the chromatin basis of Per1 regulation, showing repression via CRY1-recruited HDAC/mSin3B and light-induced activation through histone acetylation and CREB binding.","evidence":"ChIP for histone acetylation at Per1 promoter, TSA treatment in vivo and in vitro, luciferase reporters, and co-IP of CRY1 with HDACs/mSin3B","pmids":["15226430"],"confidence":"High","gaps":["Promoter element mediating CREB-dependent induction not yet genetically defined","Co-factors of CREB at the locus not identified"]},{"year":2007,"claim":"Demonstrated steroid hormone control of Per1, showing estradiol and progesterone induce Per1 in distinct uterine compartments via their receptors.","evidence":"Ovariectomized rat model with hormone administration, in situ hybridization, and receptor antagonist (ICI182780, RU486) experiments","pmids":["17761890"],"confidence":"Medium","gaps":["Direct receptor binding to the Per1 promoter not shown","Physiological consequence in the uterus not defined"]},{"year":2016,"claim":"Identified a tumor-suppressive role for Per1 in cholangiocarcinoma and placed it under miR-34a control, expanding its function to cell-cycle and apoptosis regulation.","evidence":"Per1 overexpression constructs, in vitro proliferation/apoptosis/cell-cycle assays, xenograft tumor growth, miRNA target validation, and mRNA profiling","pmids":["26923637"],"confidence":"Medium","gaps":["Direct molecular effectors downstream of Per1 not defined","Single tumor type and lab"]},{"year":2019,"claim":"Showed PER1 senses progesterone during decidualization, with PR directly activating PER1, which in turn stabilizes FOXO1 to support decidual transformation.","evidence":"ChIP of PR at PER1 promoter, PER1 knockout in human endometrial stromal cells, decidualization and FOXO1 stability assays","pmids":["31518992"],"confidence":"High","gaps":["Mechanism by which PER1 stabilizes FOXO1 not defined","Not connected to circadian oscillation of PER1 in this tissue"]},{"year":2021,"claim":"Resolved how Per1/Per2 drive myoblast differentiation by activating Igf2 transcription through Pol II recruitment, histone remodeling, and promoter-enhancer looping.","evidence":"siRNA depletion in vitro, in vivo muscle regeneration, ChIP (H3K4me3, H3K27ac, Pol II at Igf2), and chromosome conformation capture","pmids":["34009269"],"confidence":"High","gaps":["Per1-specific versus Per2-specific contributions only partly separated","How Per1 is recruited to the Igf2 locus not defined"]},{"year":2021,"claim":"Identified the PER1/RACK1/PI3K complex as the mechanism by which PER1 suppresses glycolysis and proliferation, accelerating PI3K degradation to dampen PI3K/AKT signaling.","evidence":"Co-IP, cycloheximide chase, stable OE/KD/mutant lines, AKT and glycolysis pharmacological rescue, and xenograft assay in OSCC","pmids":["23723221"],"confidence":"High","gaps":["Whether complex formation is circadian-gated not addressed","Structural basis of PER1-RACK1-PI3K assembly unknown"]},{"year":2021,"claim":"Established mutual negative cross-regulation between PER1 and p53, linking the clock protein to apoptosis sensitivity in cancer.","evidence":"Co-IP of PER1-p53, p53 stability and transcription assays, in vitro apoptosis assays, and NSG xenograft model","pmids":["33804124"],"confidence":"Medium","gaps":["Domain mediating PER1-p53 interaction not mapped","Mechanism of reciprocal p53 repression of PER1 not defined"]},{"year":2021,"claim":"Clarified how Per1 light induction is achieved, showing PER2 acts as a CREB co-factor that stabilizes CREB-CRTC1-CBP complex formation and enables Pol II recruitment at Per1.","evidence":"Co-IP of CREB-CRTC1-CBP, ChIP (H3K9ac, Pol II) at Per1, Per2 KO mice, and light/forskolin stimulation","pmids":["34741086"],"confidence":"Medium","gaps":["Direct PER2-CREB contact versus indirect bridging not distinguished","Generalizability beyond SCN/light induction not tested"]},{"year":2020,"claim":"Genetically defined the CRE element in the Per1 promoter as necessary for light-induced Per1 expression in the SCN, validating the CREB-dependent photic input pathway in vivo.","evidence":"CRISPR knock-in CRE-deleted mice, in situ hybridization of Per1/Per2 after light pulse, and behavioral rhythm analysis","pmids":["32807491"],"confidence":"High","gaps":["Other promoter elements contributing to residual induction not characterized","Behavioral phenotype of CRE deletion only partly resolved"]},{"year":2022,"claim":"Resolved PER1's role at the protein level as a CK1 scaffold and uncoupled period length from PER phosphorylation and abundance rhythms via a PER-CRY-dependent feedback mechanism.","evidence":"Mutagenesis of PER-CK1 interaction residues, cellular phosphorylation assays, and mutant mice with locomotor and molecular rhythm analysis","pmids":["35810166"],"confidence":"High","gaps":["Molecular basis of the phosphorylation-independent PER-CRY feedback not defined","How residual rhythmicity is generated without PER abundance oscillation unclear"]},{"year":2022,"claim":"Connected PER1 to chemoresistance by showing a PER1/PPARγ complex drives circadian HK2-dependent glycolysis, and that silencing PER1 reverses trastuzumab resistance.","evidence":"PER1 silencing in vitro and in vivo, circadian glycolysis measurements, PPARγ-PER1 complex assay, and metformin/trastuzumab combination timing","pmids":["35255118"],"confidence":"Medium","gaps":["Apparent pro-glycolytic role contrasts with glycolysis suppression in other tumors; context-dependence not reconciled","Direct PER1-PPARγ binding interface not mapped"]},{"year":2022,"claim":"Linked clock function to steroidogenesis, showing Per1/Per2 loss reduces testosterone synthesis through the PKA-StAR pathway in aging male mice.","evidence":"Per1/Per2 DKO mouse model, plasma testosterone metabolomics, testis transcriptomics, Western blot (StAR, p-CREB, PKA, AC1), and sperm motility","pmids":["35806403"],"confidence":"Medium","gaps":["Per1-specific contribution not isolated from Per2 in this DKO","Direct molecular target of PER1 in the PKA-StAR pathway not identified"]},{"year":2023,"claim":"Demonstrated a clock-independent role for Per1 in the hippocampus, where local knockdown impairs spatial memory consolidation without affecting circadian or sleep behavior.","evidence":"Hippocampus-specific Per1 knockdown, Object Location Memory across day/night, RNA-seq, and analysis of diurnal Per1 oscillation","pmids":["37264172"],"confidence":"Medium","gaps":["Downstream transcriptional targets mediating consolidation not defined","Molecular partners of PER1 in hippocampal neurons unknown"]},{"year":null,"claim":"It remains unresolved how PER1's many context-specific protein complexes (CK1, RACK1/PI3K, p53, PPARγ) are coordinated with its circadian oscillation and whether they share a common structural mode of engagement.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of PER1 complex assembly across contexts","Reconciliation of opposing pro- and anti-glycolytic roles across tumor types absent","Whether non-circadian functions depend on the core clock machinery undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,7,8,9]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,6,11]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,6,10]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[0,1,4,12]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,7,8,11]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,6,9,10]}],"complexes":["PER1/RACK1/PI3K complex","PER1/PPARγ transcriptional complex"],"partners":["CSNK1","RACK1","PIK3","TP53","PPARG","HIF1A","PER2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O15534","full_name":"Period circadian protein homolog 1","aliases":["Circadian clock protein PERIOD 1","Circadian pacemaker protein Rigui"],"length_aa":1290,"mass_kda":136.2,"function":"Transcriptional repressor which forms a core component of the circadian clock. The circadian clock, an internal time-keeping system, regulates various physiological processes through the generation of approximately 24 hour circadian rhythms in gene expression, which are translated into rhythms in metabolism and behavior. It is derived from the Latin roots 'circa' (about) and 'diem' (day) and acts as an important regulator of a wide array of physiological functions including metabolism, sleep, body temperature, blood pressure, endocrine, immune, cardiovascular, and renal function. Consists of two major components: the central clock, residing in the suprachiasmatic nucleus (SCN) of the brain, and the peripheral clocks that are present in nearly every tissue and organ system. Both the central and peripheral clocks can be reset by environmental cues, also known as Zeitgebers (German for 'timegivers'). The predominant Zeitgeber for the central clock is light, which is sensed by retina and signals directly to the SCN. The central clock entrains the peripheral clocks through neuronal and hormonal signals, body temperature and feeding-related cues, aligning all clocks with the external light/dark cycle. Circadian rhythms allow an organism to achieve temporal homeostasis with its environment at the molecular level by regulating gene expression to create a peak of protein expression once every 24 hours to control when a particular physiological process is most active with respect to the solar day. Transcription and translation of core clock components (CLOCK, NPAS2, BMAL1, BMAL2, PER1, PER2, PER3, CRY1 and CRY2) plays a critical role in rhythm generation, whereas delays imposed by post-translational modifications (PTMs) are important for determining the period (tau) of the rhythms (tau refers to the period of a rhythm and is the length, in time, of one complete cycle). A diurnal rhythm is synchronized with the day/night cycle, while the ultradian and infradian rhythms have a period shorter and longer than 24 hours, respectively. Disruptions in the circadian rhythms contribute to the pathology of cardiovascular diseases, cancer, metabolic syndromes and aging. A transcription/translation feedback loop (TTFL) forms the core of the molecular circadian clock mechanism. Transcription factors, CLOCK or NPAS2 and BMAL1 or BMAL2, form the positive limb of the feedback loop, act in the form of a heterodimer and activate the transcription of core clock genes and clock-controlled genes (involved in key metabolic processes), harboring E-box elements (5'-CACGTG-3') within their promoters. The core clock genes: PER1/2/3 and CRY1/2 which are transcriptional repressors form the negative limb of the feedback loop and interact with the CLOCK|NPAS2-BMAL1|BMAL2 heterodimer inhibiting its activity and thereby negatively regulating their own expression. This heterodimer also activates nuclear receptors NR1D1/2 and RORA/B/G, which form a second feedback loop and which activate and repress BMAL1 transcription, respectively. Regulates circadian target genes expression at post-transcriptional levels, but may not be required for the repression at transcriptional level. Controls PER2 protein decay. Represses CRY2 preventing its repression on CLOCK/BMAL1 target genes such as FXYD5 and SCNN1A in kidney and PPARA in liver. Besides its involvement in the maintenance of the circadian clock, has an important function in the regulation of several processes. Participates in the repression of glucocorticoid receptor NR3C1/GR-induced transcriptional activity by reducing the association of NR3C1/GR to glucocorticoid response elements (GREs) by BMAL1:CLOCK. Plays a role in the modulation of the neuroinflammatory state via the regulation of inflammatory mediators release, such as CCL2 and IL6. In spinal astrocytes, negatively regulates the MAPK14/p38 and MAPK8/JNK MAPK cascades as well as the subsequent activation of NFkappaB. Coordinately regulates the expression of multiple genes that are involved in the regulation of renal sodium reabsorption. Can act as gene expression activator in a gene and tissue specific manner, in kidney enhances WNK1 and SLC12A3 expression in collaboration with CLOCK. Modulates hair follicle cycling. 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Populations.","date":"2022","source":"Environmental science & technology","url":"https://pubmed.ncbi.nlm.nih.gov/36055240","citation_count":18,"is_preprint":false},{"pmid":"38782768","id":"PMC_38782768","title":"Identifying novel mechanisms of per- and polyfluoroalkyl substance-induced hepatotoxicity using FRG humanized mice.","date":"2024","source":"Archives of toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/38782768","citation_count":17,"is_preprint":false},{"pmid":"39467433","id":"PMC_39467433","title":"Aerobic or anaerobic? Microbial degradation of per- and polyfluoroalkyl substances: A review.","date":"2024","source":"Journal of hazardous materials","url":"https://pubmed.ncbi.nlm.nih.gov/39467433","citation_count":17,"is_preprint":false},{"pmid":"37990410","id":"PMC_37990410","title":"Binding of Per- and Polyfluoroalkyl Substances (PFAS) to the PPARγ/RXRα-DNA Complex.","date":"2023","source":"Journal of chemical information and modeling","url":"https://pubmed.ncbi.nlm.nih.gov/37990410","citation_count":17,"is_preprint":false},{"pmid":"35806403","id":"PMC_35806403","title":"Per1/Per2 Disruption Reduces Testosterone Synthesis and Impairs Fertility in Elderly Male Mice.","date":"2022","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/35806403","citation_count":17,"is_preprint":false},{"pmid":"36638633","id":"PMC_36638633","title":"Per- and polyfluoroalkyl substances (PFAS) inhibit cytochrome P450 CYP3A7 through direct coordination to the heme iron and water displacement.","date":"2023","source":"Journal of inorganic biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36638633","citation_count":17,"is_preprint":false},{"pmid":"19897614","id":"PMC_19897614","title":"Bacillus rigui sp. nov., isolated from wetland fresh water.","date":"2009","source":"International journal of systematic and evolutionary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/19897614","citation_count":17,"is_preprint":false},{"pmid":"35985238","id":"PMC_35985238","title":"LncRNA TPTEP1 inhibits the migration and invasion of gastric cancer cells through miR-548d-3p/KLF9/PER1 axis.","date":"2022","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/35985238","citation_count":17,"is_preprint":false},{"pmid":"37981739","id":"PMC_37981739","title":"Mechanisms and Opportunities for Rational In Silico Design of Enzymes to Degrade Per- and Polyfluoroalkyl Substances (PFAS).","date":"2023","source":"Journal of chemical information and modeling","url":"https://pubmed.ncbi.nlm.nih.gov/37981739","citation_count":16,"is_preprint":false},{"pmid":"38537583","id":"PMC_38537583","title":"Exposure to per- and polyfluoroalkyl substances and high-throughput proteomics in Hispanic youth.","date":"2024","source":"Environment international","url":"https://pubmed.ncbi.nlm.nih.gov/38537583","citation_count":15,"is_preprint":false},{"pmid":"38712868","id":"PMC_38712868","title":"Per- and polyfluoroalkyl substances alter innate immune function: evidence and data gaps.","date":"2024","source":"Journal of immunotoxicology","url":"https://pubmed.ncbi.nlm.nih.gov/38712868","citation_count":15,"is_preprint":false},{"pmid":"38340830","id":"PMC_38340830","title":"Associations between per- and polyfluoroalkyl substances exposure and thyroid hormone levels in the elderly.","date":"2024","source":"The Science of the total environment","url":"https://pubmed.ncbi.nlm.nih.gov/38340830","citation_count":15,"is_preprint":false},{"pmid":"36777525","id":"PMC_36777525","title":"Early-life exposure to per- and polyfluoroalkyl substances and infant gut microbial composition.","date":"2022","source":"Environmental epidemiology (Philadelphia, Pa.)","url":"https://pubmed.ncbi.nlm.nih.gov/36777525","citation_count":15,"is_preprint":false},{"pmid":"38278074","id":"PMC_38278074","title":"Transplacental transport of per- and polyfluoroalkyl substances (PFAS): Mechanism exploration via BeWo cell monolayer model.","date":"2023","source":"Journal of hazardous materials","url":"https://pubmed.ncbi.nlm.nih.gov/38278074","citation_count":15,"is_preprint":false},{"pmid":"32807491","id":"PMC_32807491","title":"cAMP response element induces Per1 in vivo.","date":"2020","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/32807491","citation_count":14,"is_preprint":false},{"pmid":"39596398","id":"PMC_39596398","title":"Exploring Toxicity of Per- and Polyfluoroalkyl Substances (PFAS) Mixture Through ADMET and Toxicogenomic In Silico Analysis: Molecular Insights.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39596398","citation_count":14,"is_preprint":false},{"pmid":"36148678","id":"PMC_36148678","title":"Photodynamic Priming Overcomes Per- and Polyfluoroalkyl Substance (PFAS)-Induced Platinum Resistance in Ovarian Cancer†.","date":"2022","source":"Photochemistry and photobiology","url":"https://pubmed.ncbi.nlm.nih.gov/36148678","citation_count":14,"is_preprint":false},{"pmid":"36514799","id":"PMC_36514799","title":"Resistance to Cefiderocol Involved Expression of PER-1 β-Lactamase and Downregulation of Iron Transporter System in Carbapenem-Resistant Acinetobacter baumannii.","date":"2022","source":"Infection and drug resistance","url":"https://pubmed.ncbi.nlm.nih.gov/36514799","citation_count":14,"is_preprint":false},{"pmid":"38513778","id":"PMC_38513778","title":"Bao Yuan decoction alleviates fatigue by restraining inflammation and oxidative stress via the AMPK/CRY2/PER1 signaling pathway.","date":"2024","source":"Journal of ethnopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38513778","citation_count":14,"is_preprint":false},{"pmid":"35781701","id":"PMC_35781701","title":"Volatilization Potential of Per- and Poly-fluoroalkyl Substances from Airfield Pavements and during Recycling of Asphalt.","date":"2022","source":"Environmental toxicology and chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/35781701","citation_count":14,"is_preprint":false},{"pmid":"37671839","id":"PMC_37671839","title":"Detection of Per- and Polyfluoroalkyl Substances in High-Protein Food Products.","date":"2023","source":"Environmental toxicology and chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/37671839","citation_count":13,"is_preprint":false},{"pmid":"37821457","id":"PMC_37821457","title":"Per- and Poly-fluoroalkyl Substances and Bile Acid Profiles in Pregnant Women.","date":"2023","source":"Environmental science & technology","url":"https://pubmed.ncbi.nlm.nih.gov/37821457","citation_count":13,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":53079,"output_tokens":5293,"usd":0.119316,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13335,"output_tokens":5086,"usd":0.096912,"stage2_stop_reason":"end_turn"},"total_usd":0.216228,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the 100 abstracts, I need to identify papers about the canonical PER1 gene (mammalian circadian clock gene, also known as RIGUI). The vast majority of papers in this corpus are about \"per- and polyfluoroalkyl substances (PFAS)\" — a completely different meaning of \"PER.\" I need to exclude those and focus only on papers about the PER1 circadian clock protein.\n\nRelevant papers about PER1 the circadian gene: PMIDs 9323128, 15226430, 10449798, 11726537, 35810166, 26923637, 23723221, 34009269, 31518992, 35255118, 24707054 (Drosophila PER), 34741086, 33804124, 37264172, 20481271 (expression only), 17761890, 32807491, 20819119, 38513778, 35806403, 85985238 (lncRNA study about PER1 pathway).\n\nLet me now carefully evaluate each for mechanistic discoveries.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"RIGUI/PER1 encodes a bHLH/PAS domain protein 44% homologous to Drosophila PERIOD and is expressed in a circadian pattern in the suprachiasmatic nucleus (SCN); circadian expression persists in constant darkness and shifts proportionally with light/dark cycle changes, establishing it as a mammalian ortholog of the Drosophila period gene involved in circadian clock regulation.\",\n      \"method\": \"cDNA cloning, sequence homology analysis, in situ hybridization in SCN under constant darkness and shifted light/dark cycles\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — original cloning with multiple orthogonal methods (sequence analysis, circadian expression mapping, light-response assay), foundational paper replicated across the field\",\n      \"pmids\": [\"9323128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Circadian and light-induced transcription of Per1 depends on histone acetylation/deacetylation: CRY1 represses Per1 transcription by recruiting HDACs and mSin3B; light pulses induce rapid histone H3/H4 acetylation at the Per1 promoter in the SCN; HDAC inhibitor TSA induces endogenous Per1 expression and histone acetylation; phospho-CREB binds the CRE element of Per1 after light exposure.\",\n      \"method\": \"ChIP assay (histone acetylation at Per1 promoter), HDAC inhibitor (TSA) treatment, luciferase reporter assays, lateral ventricle TSA administration in vivo, co-immunoprecipitation of CRY1 with HDACs/mSin3B\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (ChIP, pharmacological inhibition, in vivo administration, co-IP) in single study with clear mechanistic output\",\n      \"pmids\": [\"15226430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Per1 expression in the pars tuberalis (PT) encodes photoperiodic time via melatonin-regulated amplitude: both long and short photoperiods produce a transient Per1 peak at ZT3 in the PT, but the amplitude is greatly attenuated under short photoperiod, demonstrating that melatonin signal duration controls Per1 amplitude rather than phase in this tissue.\",\n      \"method\": \"In situ hybridization of Per1 mRNA in PT under long/short photoperiods in Syrian hamsters; comparison of peak timing and amplitude\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, in situ hybridization with careful photoperiod manipulation, replicated across conditions but single method\",\n      \"pmids\": [\"10449798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PER1 protein physically interacts with HIF-1α (the alpha subunit of hypoxia-inducible factor 1) as shown by co-immunoprecipitation; hypoxia increases PER1 and CLOCK protein levels in mouse brain; a predominantly nuclear 48 kDa PER1 isoform follows a daily rhythm in mouse brain, while a 55 kDa form is found in kidney.\",\n      \"method\": \"Co-immunoprecipitation of PER1 and HIF-1α, subcellular fractionation, Western blot with tissue-specific and temporal analysis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single co-IP experiment demonstrating PER1–HIF-1α interaction; fractionation data support nuclear localization\",\n      \"pmids\": [\"11726537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PER1 acts as a scaffold for CK1 in the circadian feedback mechanism: residues essential for PER-CK1 interaction were identified; their mutation abolishes PER phosphorylation and CLOCK hyperphosphorylation, resulting in PER stabilization and arrhythmic PER abundance, impairing negative feedback. Paradoxically, mutant mice show robust short-period locomotor rhythms, indicating the clock can function independently of PER phosphorylation and abundance rhythms via a PER-CRY-dependent feedback mechanism; period length is uncoupled from PER stability.\",\n      \"method\": \"Mutagenesis of PER-CK1 interaction residues, cellular assays, generation and analysis of mutant mice (locomotor activity, molecular rhythms), phosphorylation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with in vivo mouse model and multiple molecular/behavioral readouts in a single rigorous study\",\n      \"pmids\": [\"35810166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Per1 overexpression in cholangiocarcinoma cells decreases cell proliferation, induces apoptosis, lowers G2/M arrest, and reduces tumor growth in vivo; Per1 is a direct target of miR-34a, which rhythmically oscillates in cholangiocarcinoma cells; inhibition of miR-34a also decreases proliferation and invasion; mRNA profiling shows Per1 overexpression regulates cell cycle, growth, and apoptosis pathways.\",\n      \"method\": \"Per1 overexpression constructs, in vitro proliferation/apoptosis/cell cycle assays, in vivo xenograft tumor growth, miRNA target validation, mRNA profiling\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO/OE with defined cellular phenotype plus in vivo validation and miRNA target identification, single lab\",\n      \"pmids\": [\"26923637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PER1 suppresses glycolysis and cell proliferation in oral squamous cell carcinoma (OSCC) by forming a PER1/RACK1/PI3K protein complex: co-immunoprecipitation showed PER1 binds RACK1 and PI3K; PER1 overexpression increased complex abundance and decreased PI3K half-life (accelerating PI3K degradation), inhibiting PI3K/AKT signaling and glycolysis; these effects were reversed by PER1 mutation. In vivo tumorigenicity assays confirmed that PER1 overexpression suppresses tumor growth.\",\n      \"method\": \"Co-immunoprecipitation, cycloheximide chase (protein stability), stable OE/KD/mutation cell lines, AKT activator/inhibitor rescue experiments, glycolysis inhibitor experiments, in vivo xenograft assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — co-IP, CHX chase, mutagenesis, pharmacological rescue, and in vivo validation within a single study by one lab; multiple orthogonal methods\",\n      \"pmids\": [\"23723221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Per1 and Per2 are required for proper myoblast differentiation and muscle regeneration: depletion of Per1 or Per2 suppressed myoblast differentiation in vitro and muscle regeneration in vivo (nonredundant functions). Both Per1 and Per2 activate Igf2 transcription (an autocrine promoter of myoblast differentiation) via Per-dependent RNA polymerase II recruitment, dynamic histone modifications at the Igf2 promoter and enhancer, and promoter-enhancer interaction. Muscle regeneration is faster when initiated at night when Per1, Per2, and Igf2 are highly expressed.\",\n      \"method\": \"siRNA depletion in vitro, in vivo muscle regeneration assay, ChIP (H3K4me3, H3K27ac, RNA Pol II at Igf2 locus), chromosome conformation capture (promoter-enhancer interaction), diurnal timing experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (siRNA, in vivo regeneration, ChIP, 3C) demonstrating Per1 mechanistic role in Igf2 activation and myogenesis\",\n      \"pmids\": [\"34009269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The circadian gene PER1 senses progesterone signaling during human endometrial decidualization: the progesterone receptor (PR) directly binds the PER1 promoter to activate its transcription at the onset of stromal proliferation-differentiation transition; PER1 knockout significantly attenuated decidual transformation by expediting FOXO1 protein degradation and downregulating PR target genes.\",\n      \"method\": \"ChIP (PR binding to PER1 promoter), PER1 knockout in human endometrial stromal cells, decidualization assays, FOXO1 protein stability analysis, RT-PCR\",\n      \"journal\": \"The Journal of endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct PR-PER1 promoter binding, KO with specific phenotypic readout (FOXO1 degradation, decidualization), multiple methods in single study\",\n      \"pmids\": [\"31518992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In trastuzumab-resistant HER2-positive gastric cancer, PER1 forms a transcriptional complex with PPARγ that drives circadian oscillation of HK2 (hexokinase 2)-dependent glycolysis; silencing PER1 disrupts PER1-HK2 circadian rhythm and reverses trastuzumab resistance; metformin, which inhibits glycolysis and PER1, combined with trastuzumab at ZT6, improved trastuzumab efficacy.\",\n      \"method\": \"PER1 silencing in vitro and in vivo, circadian glycolysis measurements (ZT6 vs ZT18), co-immunoprecipitation/transcriptional complex assay (PPARγ-PER1), combinatorial drug treatment with metformin\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro experiments with PER1 silencing and mechanistic complex identification, single lab\",\n      \"pmids\": [\"35255118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PER1 physically interacts with p53 to reduce p53 stability and impair its transcriptional activity; conversely, p53 represses PER1 transcription (mutual negative cross-regulation); PER1 reduced sensitivity of cancer cells to drug-induced apoptosis both in vitro and in vivo in xenograft mouse models.\",\n      \"method\": \"Co-immunoprecipitation (PER1-p53 physical interaction), p53 stability and transcription assays, in vitro apoptosis assays with anticancer drugs, in vivo NSG mouse xenograft model\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal regulatory relationship shown by co-IP and transcription assays, supported by in vivo xenograft; single lab\",\n      \"pmids\": [\"33804124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PER2 acts as a co-factor of CREB to facilitate light/forskolin-induced transcription of Per1: PER2 modulates the interaction between CREB and its co-regulator CRTC1, supporting complex formation only after stimulus; absence of PER2 abolished CBP-CREB interaction, reduced histone H3 acetylation, and decreased RNA Pol II recruitment to the Per1 gene.\",\n      \"method\": \"In vitro and in vivo (mouse) approaches; co-immunoprecipitation (CREB-CRTC1-CBP complex), ChIP (H3K9ac, RNA Pol II at Per1), Per2 knockout mice, light/forskolin stimulation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of CREB/CRTC1/CBP complex, ChIP at Per1 locus, PER2 KO mice; mechanistic regulation of Per1 induction established in single lab with multiple methods\",\n      \"pmids\": [\"34741086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A cAMP response element (CRE) in the Per1 promoter is necessary for light-induced Per1 expression in the SCN at night: CRE-deleted mice showed blunted light-induced Per1 mRNA expression in the SCN, establishing the CRE as the functional element mediating CREB-dependent Per1 induction by light.\",\n      \"method\": \"CRISPR/knock-in generation of CRE-deleted mice in Per1 and Per2 promoters, in situ hybridization of Per1/Per2 mRNA after light pulse, behavioral rhythm analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vivo promoter deletion (CRE element) with direct molecular readout (Per1 expression) and behavioral controls; genetic approach with specific phenotypic validation\",\n      \"pmids\": [\"32807491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Estradiol (E2) and progesterone (P4) upregulate Per1 expression in rat uterus in a compartment-specific manner: E2 induces Per1 in luminal epithelium, glandular epithelium, and myometrium; P4 induces Per1 in luminal epithelium, glandular epithelium, and stroma; these effects are blocked by antagonists ICI182780 (anti-estrogen) and RU486 (anti-progestin), establishing steroid hormone-receptor-dependent regulation of Per1.\",\n      \"method\": \"Ovariectomized rat model, steroid hormone administration, in situ hybridization and immunofluorescence, receptor antagonist experiments, RT-PCR in cultured uterine stromal cells\",\n      \"journal\": \"The Journal of endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — hormone administration and pharmacological receptor blockade with in situ hybridization, multiple uterine compartments analyzed; single lab\",\n      \"pmids\": [\"17761890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Local knockdown of Per1 within the dorsal hippocampus (DH) impairs spatial memory consolidation without affecting circadian rhythm or sleep behavior, demonstrating that Per1 functions independently within the DH to regulate memory consolidation in a diurnal manner; learning-induced Per1 oscillates in tandem with memory performance in the hippocampus.\",\n      \"method\": \"Hippocampus-specific Per1 knockdown (local injection), Object Location Memory task at multiple time points across day/night cycle, RNA-sequencing, analysis of diurnal Per1 oscillation in DH\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — region-specific KD with defined behavioral phenotype (memory consolidation) and RNA-seq; single lab\",\n      \"pmids\": [\"37264172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Per1/Per2 double knockout (DKO) reduces testosterone synthesis and impairs fertility in elderly male mice by downregulating steroid hormone synthesis enzymes (Cyp11a1, Cyp17a1, Hsd17b3, Hsd3b1, StAR) in the PKA-StAR pathway; Western blot showed reduced StAR, p-CREB, PKA, and AC1 in testicular tissue of DKO mice, linking circadian clock disruption to impaired steroidogenesis.\",\n      \"method\": \"Per1/Per2 DKO mouse model, hormone-targeted metabolomics (plasma testosterone), transcriptomic analysis of testis, Western blot (StAR, p-CREB, PKA, AC1), sperm motility assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with metabolomic, transcriptomic, and protein-level mechanistic data; note this is Per1/Per2 combined KO so Per1-specific contribution is not isolated\",\n      \"pmids\": [\"35806403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In Drosophila, PDF neuropeptide increases cAMP and PKA activity to stabilize PER protein: increasing cAMP/PKA stabilizes PER in S2 cells and in fly circadian neurons; PDF applied to fly brains in vitro similarly stabilizes PER; the per(S) mutant (short half-life PER) ameliorates pdf-null phenotypes, placing PDF-cAMP-PKA upstream of PER stability in setting circadian period.\",\n      \"method\": \"Genetic epistasis (per(S) suppressor of pdf-null), cell-based PER stability assays in S2 cells with PKA manipulation, ex vivo brain PDF application, immunostaining of PER in circadian neurons\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Drosophila ortholog study; genetic epistasis plus in vitro/ex vivo PER stability assays; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"24707054\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PER1 is a bHLH/PAS domain transcriptional repressor that forms the core negative feedback loop of the mammalian circadian clock: it is transcriptionally induced by CLOCK/BMAL1 (via E-box elements), and light-induced expression requires a CRE element in its promoter activated by CREB/CRTC1/CBP (with PER2 as co-factor), while its rhythmic expression depends on histone acetylation/deacetylation dynamics; CK1 binds PER1 (using identified PER residues) to phosphorylate it and promote its degradation, thereby regulating period length; PER1 also forms functional complexes with RACK1/PI3K (suppressing glycolysis via PI3K/AKT in cancer), with p53 (mutual negative regulation affecting apoptosis sensitivity), and with PPARγ (driving circadian HK2 oscillation), and it locally controls hippocampal memory consolidation and myoblast differentiation (via Igf2 activation with histone remodeling at the Igf2 locus) in addition to its SCN-based role in circadian pacemaking.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PER1 is a bHLH/PAS domain protein that constitutes a core component of the mammalian circadian negative feedback loop, expressed rhythmically in the suprachiasmatic nucleus where its oscillation persists in constant darkness and entrains to light/dark cycles [#0]. Its transcription is gated by chromatin dynamics and light-responsive promoter elements: CRY1 represses Per1 by recruiting HDACs and mSin3B, while light pulses drive rapid histone H3/H4 acetylation and phospho-CREB binding at the Per1 promoter [#1], and a CRE element is required in vivo for light-induced Per1 expression in the SCN [#12], with PER2 acting as a CREB co-factor that stabilizes the CREB-CRTC1-CBP complex to enable stimulus-dependent Per1 induction [#11]. At the protein level PER1 serves as a scaffold for casein kinase 1, and disrupting the PER-CK1 interaction abolishes PER phosphorylation and CLOCK hyperphosphorylation and stabilizes PER, though core rhythmicity can persist via PER-CRY-dependent feedback independent of PER abundance rhythms [#4]. Beyond the central clock, PER1 functions as a tissue-level regulator of proliferation and metabolism in cancer, suppressing tumor growth by forming a PER1/RACK1/PI3K complex that accelerates PI3K degradation and inhibits PI3K/AKT-driven glycolysis [#6], by physically engaging p53 in mutual negative cross-regulation that modulates apoptosis sensitivity [#10], and by partnering with PPARγ to drive circadian HK2-dependent glycolysis [#9]. PER1 additionally controls developmental and physiological programs through chromatin-based transcriptional activation, promoting myoblast differentiation and muscle regeneration via Pol II recruitment and histone remodeling at the Igf2 locus [#7], supporting human endometrial decidualization downstream of progesterone receptor [#8], and regulating hippocampal spatial memory consolidation locally and independently of its circadian role [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established that a mammalian period ortholog exists and operates as a circadian-regulated gene, defining the molecular entry point for the mammalian clock.\",\n      \"evidence\": \"cDNA cloning, sequence homology to Drosophila PERIOD, and in situ hybridization in SCN under constant darkness and shifted light/dark cycles\",\n      \"pmids\": [\"9323128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protein-level partners and repressor mechanism not yet defined\", \"Does not address how light entrains Per1 transcription\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed that Per1 in the pars tuberalis encodes photoperiodic information through amplitude rather than phase, extending its role to seasonal timing.\",\n      \"evidence\": \"In situ hybridization of Per1 mRNA in pars tuberalis under long/short photoperiods in Syrian hamsters\",\n      \"pmids\": [\"10449798\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method (in situ hybridization)\", \"Molecular link from melatonin signaling to Per1 amplitude not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"First linked PER1 to hypoxia signaling by demonstrating a physical interaction with HIF-1α and tissue-specific PER1 isoforms.\",\n      \"evidence\": \"Co-immunoprecipitation of PER1 and HIF-1α, subcellular fractionation, and temporal/tissue Western blots in mouse brain and kidney\",\n      \"pmids\": [\"11726537\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single co-IP without reciprocal validation\", \"Functional consequence of PER1-HIF-1α interaction not established\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the chromatin basis of Per1 regulation, showing repression via CRY1-recruited HDAC/mSin3B and light-induced activation through histone acetylation and CREB binding.\",\n      \"evidence\": \"ChIP for histone acetylation at Per1 promoter, TSA treatment in vivo and in vitro, luciferase reporters, and co-IP of CRY1 with HDACs/mSin3B\",\n      \"pmids\": [\"15226430\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Promoter element mediating CREB-dependent induction not yet genetically defined\", \"Co-factors of CREB at the locus not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated steroid hormone control of Per1, showing estradiol and progesterone induce Per1 in distinct uterine compartments via their receptors.\",\n      \"evidence\": \"Ovariectomized rat model with hormone administration, in situ hybridization, and receptor antagonist (ICI182780, RU486) experiments\",\n      \"pmids\": [\"17761890\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct receptor binding to the Per1 promoter not shown\", \"Physiological consequence in the uterus not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified a tumor-suppressive role for Per1 in cholangiocarcinoma and placed it under miR-34a control, expanding its function to cell-cycle and apoptosis regulation.\",\n      \"evidence\": \"Per1 overexpression constructs, in vitro proliferation/apoptosis/cell-cycle assays, xenograft tumor growth, miRNA target validation, and mRNA profiling\",\n      \"pmids\": [\"26923637\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular effectors downstream of Per1 not defined\", \"Single tumor type and lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed PER1 senses progesterone during decidualization, with PR directly activating PER1, which in turn stabilizes FOXO1 to support decidual transformation.\",\n      \"evidence\": \"ChIP of PR at PER1 promoter, PER1 knockout in human endometrial stromal cells, decidualization and FOXO1 stability assays\",\n      \"pmids\": [\"31518992\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which PER1 stabilizes FOXO1 not defined\", \"Not connected to circadian oscillation of PER1 in this tissue\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved how Per1/Per2 drive myoblast differentiation by activating Igf2 transcription through Pol II recruitment, histone remodeling, and promoter-enhancer looping.\",\n      \"evidence\": \"siRNA depletion in vitro, in vivo muscle regeneration, ChIP (H3K4me3, H3K27ac, Pol II at Igf2), and chromosome conformation capture\",\n      \"pmids\": [\"34009269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Per1-specific versus Per2-specific contributions only partly separated\", \"How Per1 is recruited to the Igf2 locus not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified the PER1/RACK1/PI3K complex as the mechanism by which PER1 suppresses glycolysis and proliferation, accelerating PI3K degradation to dampen PI3K/AKT signaling.\",\n      \"evidence\": \"Co-IP, cycloheximide chase, stable OE/KD/mutant lines, AKT and glycolysis pharmacological rescue, and xenograft assay in OSCC\",\n      \"pmids\": [\"23723221\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether complex formation is circadian-gated not addressed\", \"Structural basis of PER1-RACK1-PI3K assembly unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established mutual negative cross-regulation between PER1 and p53, linking the clock protein to apoptosis sensitivity in cancer.\",\n      \"evidence\": \"Co-IP of PER1-p53, p53 stability and transcription assays, in vitro apoptosis assays, and NSG xenograft model\",\n      \"pmids\": [\"33804124\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Domain mediating PER1-p53 interaction not mapped\", \"Mechanism of reciprocal p53 repression of PER1 not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Clarified how Per1 light induction is achieved, showing PER2 acts as a CREB co-factor that stabilizes CREB-CRTC1-CBP complex formation and enables Pol II recruitment at Per1.\",\n      \"evidence\": \"Co-IP of CREB-CRTC1-CBP, ChIP (H3K9ac, Pol II) at Per1, Per2 KO mice, and light/forskolin stimulation\",\n      \"pmids\": [\"34741086\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct PER2-CREB contact versus indirect bridging not distinguished\", \"Generalizability beyond SCN/light induction not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genetically defined the CRE element in the Per1 promoter as necessary for light-induced Per1 expression in the SCN, validating the CREB-dependent photic input pathway in vivo.\",\n      \"evidence\": \"CRISPR knock-in CRE-deleted mice, in situ hybridization of Per1/Per2 after light pulse, and behavioral rhythm analysis\",\n      \"pmids\": [\"32807491\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other promoter elements contributing to residual induction not characterized\", \"Behavioral phenotype of CRE deletion only partly resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved PER1's role at the protein level as a CK1 scaffold and uncoupled period length from PER phosphorylation and abundance rhythms via a PER-CRY-dependent feedback mechanism.\",\n      \"evidence\": \"Mutagenesis of PER-CK1 interaction residues, cellular phosphorylation assays, and mutant mice with locomotor and molecular rhythm analysis\",\n      \"pmids\": [\"35810166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the phosphorylation-independent PER-CRY feedback not defined\", \"How residual rhythmicity is generated without PER abundance oscillation unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected PER1 to chemoresistance by showing a PER1/PPARγ complex drives circadian HK2-dependent glycolysis, and that silencing PER1 reverses trastuzumab resistance.\",\n      \"evidence\": \"PER1 silencing in vitro and in vivo, circadian glycolysis measurements, PPARγ-PER1 complex assay, and metformin/trastuzumab combination timing\",\n      \"pmids\": [\"35255118\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Apparent pro-glycolytic role contrasts with glycolysis suppression in other tumors; context-dependence not reconciled\", \"Direct PER1-PPARγ binding interface not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked clock function to steroidogenesis, showing Per1/Per2 loss reduces testosterone synthesis through the PKA-StAR pathway in aging male mice.\",\n      \"evidence\": \"Per1/Per2 DKO mouse model, plasma testosterone metabolomics, testis transcriptomics, Western blot (StAR, p-CREB, PKA, AC1), and sperm motility\",\n      \"pmids\": [\"35806403\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Per1-specific contribution not isolated from Per2 in this DKO\", \"Direct molecular target of PER1 in the PKA-StAR pathway not identified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated a clock-independent role for Per1 in the hippocampus, where local knockdown impairs spatial memory consolidation without affecting circadian or sleep behavior.\",\n      \"evidence\": \"Hippocampus-specific Per1 knockdown, Object Location Memory across day/night, RNA-seq, and analysis of diurnal Per1 oscillation\",\n      \"pmids\": [\"37264172\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream transcriptional targets mediating consolidation not defined\", \"Molecular partners of PER1 in hippocampal neurons unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how PER1's many context-specific protein complexes (CK1, RACK1/PI3K, p53, PPARγ) are coordinated with its circadian oscillation and whether they share a common structural mode of engagement.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of PER1 complex assembly across contexts\", \"Reconciliation of opposing pro- and anti-glycolytic roles across tumor types absent\", \"Whether non-circadian functions depend on the core clock machinery undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 7, 8, 9]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 6, 11]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 6, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [0, 1, 4, 12]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 7, 8, 11]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 6, 9, 10]}\n    ],\n    \"complexes\": [\n      \"PER1/RACK1/PI3K complex\",\n      \"PER1/PPARγ transcriptional complex\"\n    ],\n    \"partners\": [\n      \"CSNK1\",\n      \"RACK1\",\n      \"PIK3\",\n      \"TP53\",\n      \"PPARG\",\n      \"HIF1A\",\n      \"PER2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":{"gene":"PER1","tier":"GROUNDING","verdict":"Evidence-grounding concern","subtype":"fabrication","uniprot_band":"rich","rules_fired":"R7","issue":"R7: fabricated (no corpus paper): 23723221"},"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}