{"gene":"PER3","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2010,"finding":"PER3 physically interacts with ATM and CHK2; depletion of PER3 by siRNA almost completely abolishes CHK2 activation after DNA damage; PER3 overexpression induces CHK2 activation in an ATM-dependent manner and leads to inhibition of cell proliferation and apoptotic cell death.","method":"siRNA knockdown, co-immunoprecipitation (physical interaction with ATM and CHK2), overexpression assays in human cells","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal pulldown/co-IP with functional follow-up (siRNA + overexpression), single lab, two orthogonal methods","pmids":["21070773"],"is_preprint":false},{"year":2017,"finding":"PER3 and BMAL1 directly regulate Klf15 expression in adipocyte precursor cells (APCs); deletion of Per3 promotes adipogenesis in vivo via this clock output pathway.","method":"Per3 knockout mice, chromatin immunoprecipitation (ChIP) demonstrating direct binding of PER3/BMAL1 to Klf15 promoter, in vivo adipogenesis assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct promoter binding, in vivo knockout phenotype, multiple orthogonal methods in single study","pmids":["29186676"],"is_preprint":false},{"year":2014,"finding":"Introducing the human PER3 VNTR polymorphism (4 or 5 repeats) into mice alters sleep homeostatic responses (EEG theta power during wakefulness and delta power during sleep after sleep deprivation) without affecting circadian parameters; differentially expressed transcripts include sleep homeostasis-related genes Homer1, Ptgs2, and Kcna2 but not circadian clock genes.","method":"Humanized knock-in mice, EEG sleep recording, sleep deprivation protocol, microarray gene expression analysis of hypothalamus and cortex","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo humanized knock-in model, EEG electrophysiology, microarray; multiple orthogonal methods in single rigorous study","pmids":["24577121"],"is_preprint":false},{"year":2007,"finding":"The PER3 VNTR polymorphism (5-repeat homozygotes vs. 4-repeat) affects sleep homeostasis markers including slow-wave sleep, EEG slow-wave activity in NREM, and theta/alpha activity during wakefulness and REM, and increases cognitive performance decrement after sleep loss, without affecting circadian rhythms of melatonin, cortisol, or peripheral PER3 mRNA expression.","method":"Prospective controlled study with PER3 genotype-stratified participants, polysomnography, EEG, cognitive performance testing, melatonin/cortisol assays, PER3 mRNA expression in peripheral blood","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — prospective genotype-stratified design, multiple orthogonal physiological measures, replicated by multiple independent groups","pmids":["17346965"],"is_preprint":false},{"year":2011,"finding":"Per3-deficient mice show altered temporal distribution of wheel-running activity and vigilance states; REM and NREM sleep are reduced in the middle of the dark phase; EEG delta activity is enhanced at end of dark phase; after sleep deprivation, Per3−/− mice spend less time in wakefulness and more time in NREM sleep, and REM sleep accumulates more slowly during recovery—confirming a role for PER3 in sleep-wake timing and sleep homeostasis.","method":"Per3 knockout mice, wheel-running activity recording, polysomnography/EEG sleep recording before and after 6-hour sleep deprivation","journal":"American journal of physiology. Regulatory, integrative and comparative physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with EEG/behavioral phenotyping, replicates human findings in mouse model","pmids":["21957163"],"is_preprint":false},{"year":2011,"finding":"PER3 knockdown in human gingival cancer CA9-22 cells has an inhibitory effect on CDDP-induced apoptosis (pro-apoptotic role), while PER1 knockdown enhances apoptosis; PER3 expression is downregulated by cisplatin treatment in CA9-22 cells.","method":"siRNA-mediated knockdown of PER3, apoptosis assays, Western blot for Bim and other apoptosis markers, immunohistochemistry","journal":"European journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with defined cellular apoptosis phenotype, single lab, two orthogonal methods (functional + molecular)","pmids":["21459569"],"is_preprint":false},{"year":2016,"finding":"Overexpression of PER3 in colorectal cancer stem-like cells reduces colony formation, self-renewal efficiency, and chemoresistance via inhibition of Notch and β-catenin signaling pathways; knockdown of PER3 enhances self-renewal. PER3 overexpression decreased Notch1, Jagged1, β-catenin, c-Myc, and LGR5.","method":"PER3 overexpression and knockdown in colorectal cancer stem-like cells (HCT-116 sphere-forming), soft agar colony formation, Western blot, qRT-PCR, Notch/β-catenin inhibition experiments","journal":"Oncology research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with pathway inhibition rescue, single lab, multiple orthogonal methods","pmids":["27983919"],"is_preprint":false},{"year":2021,"finding":"Low levels of PER3 stimulate BMAL1 expression, leading to phosphorylation of β-catenin and activation of the WNT/β-catenin pathway, thereby promoting stemness of prostate cancer stem cells; PER3 overexpression suppresses sphere- and colony-forming abilities and tumorigenicity.","method":"PER3 overexpression and knockdown in prostate cancer stem cells, sphere/colony assays, tumorigenicity in immunodeficient mice, Western blot for WNT/β-catenin pathway components","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with in vivo xenograft and pathway analysis, single lab","pmids":["33816508"],"is_preprint":false},{"year":2016,"finding":"TFEB physically interacts with the CLOCK/BMAL1 complex through its N-terminal region and enhances BMAL1/CLOCK-mediated transcription of PER3 specifically; loss of TFEB function disrupts PER3 expression without affecting PER1, PER2, CRY1, or CRY2; the TFEB/CLOCK/BMAL1 complex is regulated by glucose.","method":"Co-immunoprecipitation (TFEB-CLOCK/BMAL1 interaction), TFEB loss-of-function in liver, luciferase reporter assays, glucose treatment","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP demonstrating physical interaction, functional KO with gene expression specificity, single lab","pmids":["27373683"],"is_preprint":false},{"year":2017,"finding":"The ARNTL2/NPAS2 dimer is a weaker inducer of PER3 and DBP expression than the ARNTL/NPAS2 dimer; DEC2 blocks the effect of the ARNTL2/NPAS2 dimer on PER3 expression.","method":"Transfection of cloned ARNTL, ARNTL2, NPAS2, DEC1, DEC2 in HEK293 cells, reporter gene assays, RT-qPCR","journal":"Journal of circadian rhythms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transfection-based reporter and expression assays, single lab, two orthogonal methods","pmids":["30210560"],"is_preprint":false},{"year":2019,"finding":"Per3 is expressed in the developing mouse cortex; acute knockdown of Per3 by in utero electroporation causes abnormal neuronal positioning (migration defects), impaired axon extension, and impaired dendritic arbor formation; these phenotypes are rescued by RNAi-resistant Per3.","method":"In utero electroporation-based knockdown, in situ hybridization, rescue with RNAi-resistant construct, imaging of cortical neuron migration and morphology","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockdown with rescue experiment (RNAi-resistant construct), multiple orthogonal readouts (migration, axon, dendrite)","pmids":["30971765"],"is_preprint":false},{"year":2014,"finding":"miR-103 directly targets PER3 (3'UTR) in colorectal cancer cells, reducing PER3 expression; PER3 promotes colorectal cancer cell apoptosis, and PER3 plays a tumor-suppressive role in CRC.","method":"Luciferase reporter assay (miR-103 targeting PER3 3'UTR), miR-103 overexpression, apoptosis assays","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter confirming direct miRNA-target interaction, functional apoptosis assay, single lab","pmids":["24393525"],"is_preprint":false},{"year":2019,"finding":"miR-181a directly targets PER3 in bone marrow and adipose derived stromal cells; enhanced miR-181a expression promotes adipogenesis through PER3 downregulation; knockdown of miR-181a inhibits adipogenesis through regulation of PER3.","method":"Luciferase reporter assay (direct targeting), miR-181a overexpression and knockdown, adipogenesis assays in iBMSC and PASC","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter confirming direct targeting, gain- and loss-of-function, single lab","pmids":["30670712"],"is_preprint":false},{"year":2017,"finding":"Per3-deficient mice exposed to dim light at night exhibit a transient anhedonia-like phenotype (reduced sucrose preference) that wild-type mice do not exhibit; this phenotype is alleviated by imipramine treatment. Per3−/− mice also show a smaller delay in behavioural timing than WT mice during dim light at night.","method":"Per3 knockout mice, sucrose preference test (anhedonia), dim light at night protocol, imipramine treatment, corticosterone measurement, hippocampal BDNF expression","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with specific behavioral phenotype and pharmacological rescue, single lab","pmids":["28071711"],"is_preprint":false},{"year":2014,"finding":"Per3-deficient mice take approximately one additional day to synchronize to a new long photoperiod (16L:8D) compared to wild-type mice, and are more active in the light phase under long photoperiod conditions, suggesting PER3 is involved in suppression of behavioral activity in direct response to light.","method":"Per3 knockout mice, running wheel activity recording under different photoperiod and constant darkness conditions","journal":"BioMed research international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with quantitative behavioral phenotyping, single lab, replicated across conditions","pmids":["24982860"],"is_preprint":false},{"year":2022,"finding":"circMETTL3 directly binds miR-107 which targets PER3; RUNX3 binds to the METTL3 promoter and activates circMETTL3 transcription; PER3 mediates the tumor-suppressive effects of circMETTL3/miR-107 axis in colorectal cancer.","method":"Biotin-pulldown, RIP assay, dual luciferase reporter assay, ChIP/EMSA for RUNX3/METTL3 promoter, xenograft mouse model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical methods (pulldown, RIP, luciferase, ChIP) demonstrating pathway hierarchy, single lab","pmids":["35710754"],"is_preprint":false},{"year":2024,"finding":"PER3 binds to HIF-1α via its PAS1 domain and promotes HIF-1α ubiquitination and degradation, thereby inhibiting EMT and metastasis in oral squamous cell carcinoma; PER3 promoter hypermethylation at CpG site cg12258811 inhibits PER3 expression; decitabine combined with LW6 upregulated PER3, downregulated HIF-1α, and inhibited lymph node metastasis in nude mice.","method":"Co-immunoprecipitation (PER3-HIF-1α interaction), domain mapping (PAS1 domain), ubiquitination assay, bisulfite pyrosequencing for methylation, in vivo xenograft","journal":"Translational oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with domain mapping, ubiquitination assay, in vivo validation, single lab","pmids":["39733745"],"is_preprint":false},{"year":2024,"finding":"GLYR1 transcriptionally activates PER3 by binding to its promoter; knockdown of PER3 alleviates the tumor-suppressive effects of GLYR1 in multiple myeloma cells, indicating GLYR1/PER3 is a functional signaling axis regulating myeloma cell viability and migration.","method":"Luciferase reporter assay and chromatin immunoprecipitation (GLYR1 binding to PER3 promoter), PER3 knockdown/overexpression, CCK-8/colony/TUNEL/transwell assays","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and luciferase confirming direct transcriptional regulation, epistasis via knockdown rescue, single lab","pmids":["38642856"],"is_preprint":false},{"year":2010,"finding":"PER3 promoter polymorphisms (including a VNTR at -318 and SNPs at -320 and -319) affect promoter-driven luciferase expression; the TA2G allele combination drives greater expression than GC2A or TA1G combinations; deletion analysis identified two enhancer regions (-703 to -605, and -283 to -80).","method":"Luciferase reporter gene assay, deletion reporter constructs, PCR/sequencing of promoter variants","journal":"Sleep","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — reconstitution via reporter assay with deletion mapping, single lab, functional validation of natural variants","pmids":["20469812"],"is_preprint":false},{"year":2023,"finding":"PER3 rs772027021 SNP (c.517C>T, p.P173S) in exon 5 induces increased melanin synthesis in melanocytes of affected epithelial tissues; this SNP was identified in all affected individuals of a DUH family and was shown to promote melanocyte proliferation in zebrafish in vivo; cooperation of SASH1 mutation and PER3 SNP synergistically promotes melanin synthesis and melanoma cell proliferation.","method":"Whole-exome sequencing, Sanger sequencing, in vitro melanin synthesis assays, in vivo zebrafish melanocyte proliferation phenotyping","journal":"Journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human variant validated in vitro and in vivo (zebrafish), single lab, two orthogonal methods","pmids":["36790533"],"is_preprint":false},{"year":2012,"finding":"In mouse strains (BXD family), a promoter insertion/deletion variant in Per3 causes differential protein binding through the Nrf2 transcriptional activator, leading to cis-acting control of Per3 transcript abundance; alcohol treatment increases Per3 expression in the hippocampus, and this effect interacts with acute restraint stress.","method":"High-resolution sequence analysis, eQTL mapping, protein binding affinity assays (two alleles vs. Nrf2), ethanol treatment of mice, stress protocol","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — eQTL mapping with direct protein-binding allele comparison, functional in vivo stress/alcohol experiment, single lab","pmids":["22832735"],"is_preprint":false}],"current_model":"PER3 is a circadian clock component that directly regulates Klf15 transcription (with BMAL1) to control adipogenesis, interacts physically with ATM and CHK2 to mediate DNA damage checkpoint activation, binds HIF-1α via its PAS1 domain to promote ubiquitination/degradation and suppress tumor metastasis, and modulates sleep homeostasis (slow-wave sleep, delta power) through mechanisms distinct from core circadian timekeeping—as evidenced by the VNTR polymorphism selectively altering sleep homeostatic gene expression (Homer1, Ptgs2, Kcna2) without affecting circadian period; additionally, PER3 is targeted by miR-103 and miR-181a which modulate its tumor-suppressive and adipogenic functions, and its promoter activity is regulated by TFEB (via CLOCK/BMAL1), GLYR1, and RUNX3/circMETTL3/miR-107 signaling axes."},"narrative":{"mechanistic_narrative":"PER3 is a circadian clock-associated protein whose biological output is most clearly defined in sleep homeostasis, where it acts through mechanisms distinct from core circadian timekeeping: the human PER3 VNTR polymorphism and Per3 deficiency alter slow-wave sleep, EEG delta/theta power, and homeostatic recovery from sleep deprivation while leaving melatonin, cortisol, and circadian period unaffected, with humanized knock-in mice showing selective changes in sleep-homeostasis transcripts (Homer1, Ptgs2, Kcna2) rather than clock genes [PMID:24577121, PMID:17346965, PMID:21957163]. As a clock output factor, PER3 together with BMAL1 directly binds and regulates the Klf15 promoter to restrain adipogenesis, and Per3 loss promotes fat accumulation in vivo [PMID:29186676]. PER3 transcription is itself embedded in clock circuitry, induced by ARNTL/NPAS2 dimers and antagonized by DEC2 [PMID:30210560], and enhanced by TFEB acting on the CLOCK/BMAL1 complex in a glucose-dependent manner [PMID:27373683]. Beyond timekeeping, PER3 functions in the DNA-damage checkpoint by physically interacting with ATM and CHK2 and is required for CHK2 activation after damage [PMID:21070773], and acts as a tumor suppressor across multiple cancers by binding HIF-1α through its PAS1 domain to promote its ubiquitination and degradation, thereby blocking EMT and metastasis [PMID:39733745], and by suppressing cancer stem-cell self-renewal via inhibition of Notch and WNT/β-catenin signaling [PMID:27983919, PMID:33816508]. PER3 expression is constrained by direct miRNA targeting (miR-103, miR-181a, the circMETTL3/miR-107 axis) and by transcriptional regulators including GLYR1, linking its dosage to adipogenic and tumor-suppressive outcomes [PMID:24393525, PMID:30670712, PMID:35710754, PMID:38642856]. PER3 also contributes to cortical neuronal migration and morphogenesis during development [PMID:30971765].","teleology":[{"year":2007,"claim":"Established that PER3 influences sleep homeostasis independently of circadian timing, resolving whether a clock gene could have a dedicated sleep-regulatory role.","evidence":"Genotype-stratified prospective human study with polysomnography, EEG, cognitive testing, and melatonin/cortisol/mRNA assays comparing PER3 VNTR alleles","pmids":["17346965"],"confidence":"High","gaps":["Does not identify the molecular effector linking the VNTR to slow-wave activity","Correlative human genotype association without mechanism"]},{"year":2010,"claim":"Defined a non-circadian role for PER3 in the DNA-damage response by placing it physically and functionally within the ATM-CHK2 checkpoint.","evidence":"Co-immunoprecipitation with ATM and CHK2, siRNA knockdown, and overexpression with proliferation/apoptosis readouts in human cells","pmids":["21070773"],"confidence":"Medium","gaps":["No structural basis for the ATM/CHK2 interaction","Whether PER3 acts as scaffold, substrate, or activator is unresolved"]},{"year":2010,"claim":"Showed that natural PER3 promoter variation functionally tunes its expression, linking sequence polymorphism to transcriptional output.","evidence":"Luciferase reporter assays with allele combinations and deletion mapping of enhancer regions","pmids":["20469812"],"confidence":"Medium","gaps":["Trans-acting factors binding the mapped enhancers not identified","Reporter assays not validated at endogenous locus"]},{"year":2011,"claim":"Confirmed in a genetic model that PER3 shapes sleep-wake timing and homeostatic recovery, corroborating human findings in mouse.","evidence":"Per3 knockout mice with wheel-running and EEG phenotyping before and after 6-hour sleep deprivation","pmids":["21957163"],"confidence":"High","gaps":["Molecular pathway driving altered delta activity not defined","Brain region responsible not localized"]},{"year":2011,"claim":"Implicated PER3 dosage in chemotherapy-induced apoptosis, opening its role in cancer cell survival.","evidence":"siRNA knockdown in gingival cancer cells with apoptosis assays and Western blot after cisplatin","pmids":["21459569"],"confidence":"Medium","gaps":["Mechanism linking PER3 to apoptotic machinery not defined","Single cell line"]},{"year":2012,"claim":"Identified a cis-acting promoter variant controlling Per3 abundance through Nrf2 binding, connecting PER3 regulation to stress and alcohol responses.","evidence":"eQTL mapping in BXD mouse strains, allele-specific protein-binding assays, ethanol and restraint stress protocols","pmids":["22832735"],"confidence":"Medium","gaps":["Direct Nrf2 occupancy at endogenous promoter not shown","Functional consequence of altered hippocampal Per3 unclear"]},{"year":2014,"claim":"Demonstrated using a humanized model that the PER3 VNTR selectively alters sleep-homeostasis gene expression without perturbing clock genes, mechanistically separating PER3's sleep role from timekeeping.","evidence":"Humanized VNTR knock-in mice, EEG recording, sleep deprivation, microarray of hypothalamus and cortex","pmids":["24577121"],"confidence":"High","gaps":["How the VNTR alters Homer1/Ptgs2/Kcna2 expression is unknown","Causal effector among differentially expressed genes not established"]},{"year":2014,"claim":"Showed PER3 acts as a tumor suppressor in colorectal cancer and is directly repressed by miR-103, establishing post-transcriptional control of its function.","evidence":"Luciferase reporter of miR-103 targeting PER3 3'UTR, miR-103 overexpression, apoptosis assays","pmids":["24393525"],"confidence":"Medium","gaps":["Downstream apoptotic mediators of PER3 not identified","Single cancer context"]},{"year":2014,"claim":"Found PER3 contributes to acute behavioral suppression by light during photoperiod adaptation, distinguishing a light-response function.","evidence":"Per3 knockout mice with running-wheel activity under varying photoperiods","pmids":["24982860"],"confidence":"Medium","gaps":["Molecular link between PER3 and light masking unknown","Neural circuit not defined"]},{"year":2016,"claim":"Placed PER3 transcription under control of TFEB acting on CLOCK/BMAL1, revealing a glucose-responsive and PER3-specific regulatory input.","evidence":"Co-IP of TFEB with CLOCK/BMAL1, TFEB loss-of-function in liver, luciferase reporters with glucose treatment","pmids":["27373683"],"confidence":"Medium","gaps":["Why TFEB selectively regulates PER3 over other PER/CRY genes unexplained","Physiological output of glucose-TFEB-PER3 axis not measured"]},{"year":2016,"claim":"Defined PER3's suppression of cancer stem-cell self-renewal through Notch and β-catenin pathways.","evidence":"Overexpression and knockdown in colorectal cancer stem-like cells with colony/self-renewal assays and Western blot for Notch/β-catenin components","pmids":["27983919"],"confidence":"Medium","gaps":["Whether PER3 acts directly on Notch/WNT components or indirectly is unresolved","No in vivo tumor data"]},{"year":2017,"claim":"Established PER3/BMAL1 as direct transcriptional regulators of Klf15 that restrain adipogenesis, defining a concrete clock-output mechanism.","evidence":"Per3 knockout mice, ChIP showing PER3/BMAL1 binding to the Klf15 promoter, in vivo adipogenesis assays","pmids":["29186676"],"confidence":"High","gaps":["How PER3 cooperates with BMAL1 mechanistically at the promoter is undefined","Tissue specificity of the PER3-Klf15 axis not mapped"]},{"year":2017,"claim":"Linked PER3 deficiency to mood-relevant behavior under light stress, broadening its physiological reach.","evidence":"Per3 knockout mice with sucrose preference test, dim-light-at-night protocol, imipramine rescue","pmids":["28071711"],"confidence":"Medium","gaps":["Molecular pathway connecting PER3 to anhedonia not identified","Relationship to circadian phenotypes unclear"]},{"year":2017,"claim":"Quantified differential PER3 induction by ARNTL2/NPAS2 versus ARNTL/NPAS2 dimers and antagonism by DEC2, refining the transcriptional inputs to PER3.","evidence":"Transfection of clock factors in HEK293 cells with reporter assays and RT-qPCR","pmids":["30210560"],"confidence":"Medium","gaps":["Endogenous relevance of ARNTL2/NPAS2 to PER3 not tested","DEC2 mechanism of blockade not defined"]},{"year":2019,"claim":"Revealed a developmental role for PER3 in cortical neuron migration and morphogenesis, beyond its clock and cancer functions.","evidence":"In utero electroporation knockdown with RNAi-resistant rescue, in situ hybridization, imaging of migration and dendrite/axon morphology","pmids":["30971765"],"confidence":"High","gaps":["Molecular effectors of PER3 in migrating neurons unknown","Whether this role depends on clock partners untested"]},{"year":2019,"claim":"Connected PER3 to adipogenesis through direct miR-181a targeting, reinforcing post-transcriptional control of its metabolic function.","evidence":"Luciferase reporter of direct targeting, miR-181a gain- and loss-of-function, adipogenesis assays in stromal cells","pmids":["30670712"],"confidence":"Medium","gaps":["Whether miR-181a-PER3 converges on the Klf15 pathway not tested","In vivo relevance not established"]},{"year":2022,"claim":"Positioned PER3 as the downstream effector of a RUNX3/circMETTL3/miR-107 tumor-suppressive axis in colorectal cancer.","evidence":"Biotin pulldown, RIP, dual luciferase, ChIP/EMSA for RUNX3/METTL3 promoter, and xenograft model","pmids":["35710754"],"confidence":"Medium","gaps":["Mechanism of PER3 tumor suppression downstream of this axis not detailed","Single cancer type"]},{"year":2024,"claim":"Defined a direct molecular mechanism for PER3 tumor suppression: PAS1-domain binding to HIF-1α driving its ubiquitination and degradation to block metastasis.","evidence":"Co-IP with domain mapping, ubiquitination assay, bisulfite pyrosequencing of PER3 promoter methylation, and xenograft with decitabine/LW6","pmids":["39733745"],"confidence":"Medium","gaps":["Whether PER3 recruits an E3 ligase or acts as adaptor is unresolved","Single cancer model"]},{"year":2024,"claim":"Identified GLYR1 as a direct transcriptional activator of PER3 mediating its tumor-suppressive effect in myeloma.","evidence":"Luciferase and ChIP for GLYR1 binding to PER3 promoter, PER3 knockdown/overexpression epistasis, viability/migration assays","pmids":["38642856"],"confidence":"Medium","gaps":["Downstream PER3 effectors in myeloma not defined","GLYR1-PER3 axis not validated in vivo"]},{"year":2023,"claim":"Linked a coding PER3 variant to pigmentary disease by showing it promotes melanin synthesis and melanocyte proliferation.","evidence":"Whole-exome and Sanger sequencing of a DUH family, in vitro melanin assays, and zebrafish melanocyte proliferation phenotyping","pmids":["36790533"],"confidence":"Medium","gaps":["Mechanism by which p.P173S alters melanin synthesis unknown","Independence from circadian function not established"]},{"year":null,"claim":"How PER3's molecular activities — checkpoint scaffolding, HIF-1α degradation, and transcriptional co-regulation — mechanistically connect to its defining sleep-homeostatic phenotype remains unresolved.","evidence":"No timeline study unifies the biochemical and behavioral functions of PER3","pmids":[],"confidence":"Low","gaps":["No structural model of PER3 domains in any complex","The effector linking the VNTR to slow-wave sleep is unidentified","Whether PER3's tumor-suppressive and sleep roles share a mechanism is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[16]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[2,3,4,9]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[16,6,7]}],"complexes":[],"partners":["BMAL1","ATM","CHK2","HIF-1Α","TFEB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P56645","full_name":"Period circadian protein homolog 3","aliases":["Cell growth-inhibiting gene 13 protein","Circadian clock protein PERIOD 3"],"length_aa":1201,"mass_kda":131.9,"function":"Originally described as 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, NR1D2, RORA, RORB and RORG, which form a second feedback loop and which activate and repress BMAL1 transcription, respectively. Has a redundant role with the other PER proteins PER1 and PER2 and is not essential for the circadian rhythms maintenance. In contrast, plays an important role in sleep-wake timing and sleep homeostasis probably through the transcriptional regulation of sleep homeostasis-related genes, without influencing circadian parameters. 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differences.","date":"2024","source":"Journal of behavioral addictions","url":"https://pubmed.ncbi.nlm.nih.gov/38829707","citation_count":6,"is_preprint":false},{"pmid":"34721627","id":"PMC_34721627","title":"RNA-Seq Analysis Reveals Dendrobium officinale Polysaccharides Inhibit Precancerous Lesions of Gastric Cancer through PER3 and AQP4.","date":"2021","source":"Evidence-based complementary and alternative medicine : eCAM","url":"https://pubmed.ncbi.nlm.nih.gov/34721627","citation_count":6,"is_preprint":false},{"pmid":"28900721","id":"PMC_28900721","title":"Effects of PER3 clock gene polymorphisms on aging-related changes of the cerebral cortex.","date":"2017","source":"Brain structure & function","url":"https://pubmed.ncbi.nlm.nih.gov/28900721","citation_count":6,"is_preprint":false},{"pmid":"38992306","id":"PMC_38992306","title":"The influence of PER3 VNTR genotypes on the age of onset in a group of bipolar I disorder patients: an exploratory study.","date":"2024","source":"International journal of bipolar disorders","url":"https://pubmed.ncbi.nlm.nih.gov/38992306","citation_count":6,"is_preprint":false},{"pmid":"39733745","id":"PMC_39733745","title":"PER3 suppresses tumor metastasis of oral squamous cell carcinoma by promoting HIF-1α degradation.","date":"2024","source":"Translational oncology","url":"https://pubmed.ncbi.nlm.nih.gov/39733745","citation_count":5,"is_preprint":false},{"pmid":"23128810","id":"PMC_23128810","title":"Per3 VNTR polymorphism and chronic heart failure.","date":"2012","source":"Biomedical papers of the Medical Faculty of the University Palacky, Olomouc, Czechoslovakia","url":"https://pubmed.ncbi.nlm.nih.gov/23128810","citation_count":5,"is_preprint":false},{"pmid":"33501709","id":"PMC_33501709","title":"Associations of PER3 polymorphisms with clopidogrel resistance among Chinese Han people treated with clopidogrel.","date":"2021","source":"Journal of clinical laboratory analysis","url":"https://pubmed.ncbi.nlm.nih.gov/33501709","citation_count":5,"is_preprint":false},{"pmid":"39402618","id":"PMC_39402618","title":"PER3 promoter hypermethylation correlates to the progression of pan-cancer.","date":"2024","source":"Clinical epigenetics","url":"https://pubmed.ncbi.nlm.nih.gov/39402618","citation_count":4,"is_preprint":false},{"pmid":"36548883","id":"PMC_36548883","title":"PERIOD3 (PER3) VNTR Variant Associated with Seasonal Pattern and Family History in Bipolar Disorder.","date":"2022","source":"Psychiatria Danubina","url":"https://pubmed.ncbi.nlm.nih.gov/36548883","citation_count":4,"is_preprint":false},{"pmid":"39771050","id":"PMC_39771050","title":"DEHP-Induced Glioblastoma in Zebrafish Is Associated with Circadian Dysregulation of PER3.","date":"2024","source":"Toxics","url":"https://pubmed.ncbi.nlm.nih.gov/39771050","citation_count":4,"is_preprint":false},{"pmid":"34542826","id":"PMC_34542826","title":"Is There a Link between Circadian Clock Protein PERIOD 3 (PER3) (rs57875989) Variant and the Severity of COVID-19 Infection?","date":"2021","source":"Current medical science","url":"https://pubmed.ncbi.nlm.nih.gov/34542826","citation_count":4,"is_preprint":false},{"pmid":"28055273","id":"PMC_28055273","title":"Higher scores in the extraversion personality trait are associated with a functional polymorphism in the PER3 gene in healthy subjects.","date":"2017","source":"Chronobiology international","url":"https://pubmed.ncbi.nlm.nih.gov/28055273","citation_count":4,"is_preprint":false},{"pmid":"39759625","id":"PMC_39759625","title":"Unveiling the Role of Human PER3 Gene Polymorphism (rs57875989) as a Potential Risk Factor in Fibromyalgia Syndrome Patients.","date":"2024","source":"Cureus","url":"https://pubmed.ncbi.nlm.nih.gov/39759625","citation_count":3,"is_preprint":false},{"pmid":"38642856","id":"PMC_38642856","title":"GLYR1 transcriptionally regulates PER3 expression to promote the proliferation and migration of multiple myeloma.","date":"2024","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/38642856","citation_count":2,"is_preprint":false},{"pmid":"38037954","id":"PMC_38037954","title":"Investigation of circadian rhythm gene Per3 in diabetic neuropathy.","date":"2023","source":"Nucleosides, nucleotides & nucleic acids","url":"https://pubmed.ncbi.nlm.nih.gov/38037954","citation_count":2,"is_preprint":false},{"pmid":"36981669","id":"PMC_36981669","title":"Influence of Environmental Exposure to Steel Waste on Endocrine Dysregulation and PER3 Gene Polymorphisms.","date":"2023","source":"International journal of environmental research and public health","url":"https://pubmed.ncbi.nlm.nih.gov/36981669","citation_count":2,"is_preprint":false},{"pmid":"35707903","id":"PMC_35707903","title":"A circadian rhythm gene (PER3) VNTR variant as possible risk factor in cohort of Turkish females with primary dysmenorrhea.","date":"2022","source":"Nucleosides, nucleotides & nucleic acids","url":"https://pubmed.ncbi.nlm.nih.gov/35707903","citation_count":2,"is_preprint":false},{"pmid":"38695651","id":"PMC_38695651","title":"Variants in the circadian clock genes PER2 and PER3 associate with familial sleep phase disorders.","date":"2024","source":"Chronobiology international","url":"https://pubmed.ncbi.nlm.nih.gov/38695651","citation_count":2,"is_preprint":false},{"pmid":"37691400","id":"PMC_37691400","title":"Actigraphic characterization of sleep and circadian phenotypes of PER3 gene VNTR genotypes.","date":"2023","source":"Chronobiology international","url":"https://pubmed.ncbi.nlm.nih.gov/37691400","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50837,"output_tokens":5158,"usd":0.114941,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13534,"output_tokens":5423,"usd":0.101623,"stage2_stop_reason":"end_turn"},"total_usd":0.216564,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2010,\n      \"finding\": \"PER3 physically interacts with ATM and CHK2; depletion of PER3 by siRNA almost completely abolishes CHK2 activation after DNA damage; PER3 overexpression induces CHK2 activation in an ATM-dependent manner and leads to inhibition of cell proliferation and apoptotic cell death.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation (physical interaction with ATM and CHK2), overexpression assays in human cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal pulldown/co-IP with functional follow-up (siRNA + overexpression), single lab, two orthogonal methods\",\n      \"pmids\": [\"21070773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PER3 and BMAL1 directly regulate Klf15 expression in adipocyte precursor cells (APCs); deletion of Per3 promotes adipogenesis in vivo via this clock output pathway.\",\n      \"method\": \"Per3 knockout mice, chromatin immunoprecipitation (ChIP) demonstrating direct binding of PER3/BMAL1 to Klf15 promoter, in vivo adipogenesis assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct promoter binding, in vivo knockout phenotype, multiple orthogonal methods in single study\",\n      \"pmids\": [\"29186676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Introducing the human PER3 VNTR polymorphism (4 or 5 repeats) into mice alters sleep homeostatic responses (EEG theta power during wakefulness and delta power during sleep after sleep deprivation) without affecting circadian parameters; differentially expressed transcripts include sleep homeostasis-related genes Homer1, Ptgs2, and Kcna2 but not circadian clock genes.\",\n      \"method\": \"Humanized knock-in mice, EEG sleep recording, sleep deprivation protocol, microarray gene expression analysis of hypothalamus and cortex\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo humanized knock-in model, EEG electrophysiology, microarray; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"24577121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The PER3 VNTR polymorphism (5-repeat homozygotes vs. 4-repeat) affects sleep homeostasis markers including slow-wave sleep, EEG slow-wave activity in NREM, and theta/alpha activity during wakefulness and REM, and increases cognitive performance decrement after sleep loss, without affecting circadian rhythms of melatonin, cortisol, or peripheral PER3 mRNA expression.\",\n      \"method\": \"Prospective controlled study with PER3 genotype-stratified participants, polysomnography, EEG, cognitive performance testing, melatonin/cortisol assays, PER3 mRNA expression in peripheral blood\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — prospective genotype-stratified design, multiple orthogonal physiological measures, replicated by multiple independent groups\",\n      \"pmids\": [\"17346965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Per3-deficient mice show altered temporal distribution of wheel-running activity and vigilance states; REM and NREM sleep are reduced in the middle of the dark phase; EEG delta activity is enhanced at end of dark phase; after sleep deprivation, Per3−/− mice spend less time in wakefulness and more time in NREM sleep, and REM sleep accumulates more slowly during recovery—confirming a role for PER3 in sleep-wake timing and sleep homeostasis.\",\n      \"method\": \"Per3 knockout mice, wheel-running activity recording, polysomnography/EEG sleep recording before and after 6-hour sleep deprivation\",\n      \"journal\": \"American journal of physiology. Regulatory, integrative and comparative physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with EEG/behavioral phenotyping, replicates human findings in mouse model\",\n      \"pmids\": [\"21957163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PER3 knockdown in human gingival cancer CA9-22 cells has an inhibitory effect on CDDP-induced apoptosis (pro-apoptotic role), while PER1 knockdown enhances apoptosis; PER3 expression is downregulated by cisplatin treatment in CA9-22 cells.\",\n      \"method\": \"siRNA-mediated knockdown of PER3, apoptosis assays, Western blot for Bim and other apoptosis markers, immunohistochemistry\",\n      \"journal\": \"European journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with defined cellular apoptosis phenotype, single lab, two orthogonal methods (functional + molecular)\",\n      \"pmids\": [\"21459569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Overexpression of PER3 in colorectal cancer stem-like cells reduces colony formation, self-renewal efficiency, and chemoresistance via inhibition of Notch and β-catenin signaling pathways; knockdown of PER3 enhances self-renewal. PER3 overexpression decreased Notch1, Jagged1, β-catenin, c-Myc, and LGR5.\",\n      \"method\": \"PER3 overexpression and knockdown in colorectal cancer stem-like cells (HCT-116 sphere-forming), soft agar colony formation, Western blot, qRT-PCR, Notch/β-catenin inhibition experiments\",\n      \"journal\": \"Oncology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with pathway inhibition rescue, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"27983919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Low levels of PER3 stimulate BMAL1 expression, leading to phosphorylation of β-catenin and activation of the WNT/β-catenin pathway, thereby promoting stemness of prostate cancer stem cells; PER3 overexpression suppresses sphere- and colony-forming abilities and tumorigenicity.\",\n      \"method\": \"PER3 overexpression and knockdown in prostate cancer stem cells, sphere/colony assays, tumorigenicity in immunodeficient mice, Western blot for WNT/β-catenin pathway components\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with in vivo xenograft and pathway analysis, single lab\",\n      \"pmids\": [\"33816508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TFEB physically interacts with the CLOCK/BMAL1 complex through its N-terminal region and enhances BMAL1/CLOCK-mediated transcription of PER3 specifically; loss of TFEB function disrupts PER3 expression without affecting PER1, PER2, CRY1, or CRY2; the TFEB/CLOCK/BMAL1 complex is regulated by glucose.\",\n      \"method\": \"Co-immunoprecipitation (TFEB-CLOCK/BMAL1 interaction), TFEB loss-of-function in liver, luciferase reporter assays, glucose treatment\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP demonstrating physical interaction, functional KO with gene expression specificity, single lab\",\n      \"pmids\": [\"27373683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The ARNTL2/NPAS2 dimer is a weaker inducer of PER3 and DBP expression than the ARNTL/NPAS2 dimer; DEC2 blocks the effect of the ARNTL2/NPAS2 dimer on PER3 expression.\",\n      \"method\": \"Transfection of cloned ARNTL, ARNTL2, NPAS2, DEC1, DEC2 in HEK293 cells, reporter gene assays, RT-qPCR\",\n      \"journal\": \"Journal of circadian rhythms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transfection-based reporter and expression assays, single lab, two orthogonal methods\",\n      \"pmids\": [\"30210560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Per3 is expressed in the developing mouse cortex; acute knockdown of Per3 by in utero electroporation causes abnormal neuronal positioning (migration defects), impaired axon extension, and impaired dendritic arbor formation; these phenotypes are rescued by RNAi-resistant Per3.\",\n      \"method\": \"In utero electroporation-based knockdown, in situ hybridization, rescue with RNAi-resistant construct, imaging of cortical neuron migration and morphology\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockdown with rescue experiment (RNAi-resistant construct), multiple orthogonal readouts (migration, axon, dendrite)\",\n      \"pmids\": [\"30971765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-103 directly targets PER3 (3'UTR) in colorectal cancer cells, reducing PER3 expression; PER3 promotes colorectal cancer cell apoptosis, and PER3 plays a tumor-suppressive role in CRC.\",\n      \"method\": \"Luciferase reporter assay (miR-103 targeting PER3 3'UTR), miR-103 overexpression, apoptosis assays\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter confirming direct miRNA-target interaction, functional apoptosis assay, single lab\",\n      \"pmids\": [\"24393525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-181a directly targets PER3 in bone marrow and adipose derived stromal cells; enhanced miR-181a expression promotes adipogenesis through PER3 downregulation; knockdown of miR-181a inhibits adipogenesis through regulation of PER3.\",\n      \"method\": \"Luciferase reporter assay (direct targeting), miR-181a overexpression and knockdown, adipogenesis assays in iBMSC and PASC\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter confirming direct targeting, gain- and loss-of-function, single lab\",\n      \"pmids\": [\"30670712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Per3-deficient mice exposed to dim light at night exhibit a transient anhedonia-like phenotype (reduced sucrose preference) that wild-type mice do not exhibit; this phenotype is alleviated by imipramine treatment. Per3−/− mice also show a smaller delay in behavioural timing than WT mice during dim light at night.\",\n      \"method\": \"Per3 knockout mice, sucrose preference test (anhedonia), dim light at night protocol, imipramine treatment, corticosterone measurement, hippocampal BDNF expression\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with specific behavioral phenotype and pharmacological rescue, single lab\",\n      \"pmids\": [\"28071711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Per3-deficient mice take approximately one additional day to synchronize to a new long photoperiod (16L:8D) compared to wild-type mice, and are more active in the light phase under long photoperiod conditions, suggesting PER3 is involved in suppression of behavioral activity in direct response to light.\",\n      \"method\": \"Per3 knockout mice, running wheel activity recording under different photoperiod and constant darkness conditions\",\n      \"journal\": \"BioMed research international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with quantitative behavioral phenotyping, single lab, replicated across conditions\",\n      \"pmids\": [\"24982860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"circMETTL3 directly binds miR-107 which targets PER3; RUNX3 binds to the METTL3 promoter and activates circMETTL3 transcription; PER3 mediates the tumor-suppressive effects of circMETTL3/miR-107 axis in colorectal cancer.\",\n      \"method\": \"Biotin-pulldown, RIP assay, dual luciferase reporter assay, ChIP/EMSA for RUNX3/METTL3 promoter, xenograft mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical methods (pulldown, RIP, luciferase, ChIP) demonstrating pathway hierarchy, single lab\",\n      \"pmids\": [\"35710754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PER3 binds to HIF-1α via its PAS1 domain and promotes HIF-1α ubiquitination and degradation, thereby inhibiting EMT and metastasis in oral squamous cell carcinoma; PER3 promoter hypermethylation at CpG site cg12258811 inhibits PER3 expression; decitabine combined with LW6 upregulated PER3, downregulated HIF-1α, and inhibited lymph node metastasis in nude mice.\",\n      \"method\": \"Co-immunoprecipitation (PER3-HIF-1α interaction), domain mapping (PAS1 domain), ubiquitination assay, bisulfite pyrosequencing for methylation, in vivo xenograft\",\n      \"journal\": \"Translational oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with domain mapping, ubiquitination assay, in vivo validation, single lab\",\n      \"pmids\": [\"39733745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GLYR1 transcriptionally activates PER3 by binding to its promoter; knockdown of PER3 alleviates the tumor-suppressive effects of GLYR1 in multiple myeloma cells, indicating GLYR1/PER3 is a functional signaling axis regulating myeloma cell viability and migration.\",\n      \"method\": \"Luciferase reporter assay and chromatin immunoprecipitation (GLYR1 binding to PER3 promoter), PER3 knockdown/overexpression, CCK-8/colony/TUNEL/transwell assays\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and luciferase confirming direct transcriptional regulation, epistasis via knockdown rescue, single lab\",\n      \"pmids\": [\"38642856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PER3 promoter polymorphisms (including a VNTR at -318 and SNPs at -320 and -319) affect promoter-driven luciferase expression; the TA2G allele combination drives greater expression than GC2A or TA1G combinations; deletion analysis identified two enhancer regions (-703 to -605, and -283 to -80).\",\n      \"method\": \"Luciferase reporter gene assay, deletion reporter constructs, PCR/sequencing of promoter variants\",\n      \"journal\": \"Sleep\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution via reporter assay with deletion mapping, single lab, functional validation of natural variants\",\n      \"pmids\": [\"20469812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PER3 rs772027021 SNP (c.517C>T, p.P173S) in exon 5 induces increased melanin synthesis in melanocytes of affected epithelial tissues; this SNP was identified in all affected individuals of a DUH family and was shown to promote melanocyte proliferation in zebrafish in vivo; cooperation of SASH1 mutation and PER3 SNP synergistically promotes melanin synthesis and melanoma cell proliferation.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing, in vitro melanin synthesis assays, in vivo zebrafish melanocyte proliferation phenotyping\",\n      \"journal\": \"Journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human variant validated in vitro and in vivo (zebrafish), single lab, two orthogonal methods\",\n      \"pmids\": [\"36790533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In mouse strains (BXD family), a promoter insertion/deletion variant in Per3 causes differential protein binding through the Nrf2 transcriptional activator, leading to cis-acting control of Per3 transcript abundance; alcohol treatment increases Per3 expression in the hippocampus, and this effect interacts with acute restraint stress.\",\n      \"method\": \"High-resolution sequence analysis, eQTL mapping, protein binding affinity assays (two alleles vs. Nrf2), ethanol treatment of mice, stress protocol\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — eQTL mapping with direct protein-binding allele comparison, functional in vivo stress/alcohol experiment, single lab\",\n      \"pmids\": [\"22832735\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PER3 is a circadian clock component that directly regulates Klf15 transcription (with BMAL1) to control adipogenesis, interacts physically with ATM and CHK2 to mediate DNA damage checkpoint activation, binds HIF-1α via its PAS1 domain to promote ubiquitination/degradation and suppress tumor metastasis, and modulates sleep homeostasis (slow-wave sleep, delta power) through mechanisms distinct from core circadian timekeeping—as evidenced by the VNTR polymorphism selectively altering sleep homeostatic gene expression (Homer1, Ptgs2, Kcna2) without affecting circadian period; additionally, PER3 is targeted by miR-103 and miR-181a which modulate its tumor-suppressive and adipogenic functions, and its promoter activity is regulated by TFEB (via CLOCK/BMAL1), GLYR1, and RUNX3/circMETTL3/miR-107 signaling axes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PER3 is a circadian clock-associated protein whose biological output is most clearly defined in sleep homeostasis, where it acts through mechanisms distinct from core circadian timekeeping: the human PER3 VNTR polymorphism and Per3 deficiency alter slow-wave sleep, EEG delta/theta power, and homeostatic recovery from sleep deprivation while leaving melatonin, cortisol, and circadian period unaffected, with humanized knock-in mice showing selective changes in sleep-homeostasis transcripts (Homer1, Ptgs2, Kcna2) rather than clock genes [#2, #3, #4]. As a clock output factor, PER3 together with BMAL1 directly binds and regulates the Klf15 promoter to restrain adipogenesis, and Per3 loss promotes fat accumulation in vivo [#1]. PER3 transcription is itself embedded in clock circuitry, induced by ARNTL/NPAS2 dimers and antagonized by DEC2 [#9], and enhanced by TFEB acting on the CLOCK/BMAL1 complex in a glucose-dependent manner [#8]. Beyond timekeeping, PER3 functions in the DNA-damage checkpoint by physically interacting with ATM and CHK2 and is required for CHK2 activation after damage [#0], and acts as a tumor suppressor across multiple cancers by binding HIF-1\\u03b1 through its PAS1 domain to promote its ubiquitination and degradation, thereby blocking EMT and metastasis [#16], and by suppressing cancer stem-cell self-renewal via inhibition of Notch and WNT/\\u03b2-catenin signaling [#6, #7]. PER3 expression is constrained by direct miRNA targeting (miR-103, miR-181a, the circMETTL3/miR-107 axis) and by transcriptional regulators including GLYR1, linking its dosage to adipogenic and tumor-suppressive outcomes [#11, #12, #15, #17]. PER3 also contributes to cortical neuronal migration and morphogenesis during development [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that PER3 influences sleep homeostasis independently of circadian timing, resolving whether a clock gene could have a dedicated sleep-regulatory role.\",\n      \"evidence\": \"Genotype-stratified prospective human study with polysomnography, EEG, cognitive testing, and melatonin/cortisol/mRNA assays comparing PER3 VNTR alleles\",\n      \"pmids\": [\"17346965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify the molecular effector linking the VNTR to slow-wave activity\", \"Correlative human genotype association without mechanism\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined a non-circadian role for PER3 in the DNA-damage response by placing it physically and functionally within the ATM-CHK2 checkpoint.\",\n      \"evidence\": \"Co-immunoprecipitation with ATM and CHK2, siRNA knockdown, and overexpression with proliferation/apoptosis readouts in human cells\",\n      \"pmids\": [\"21070773\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural basis for the ATM/CHK2 interaction\", \"Whether PER3 acts as scaffold, substrate, or activator is unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed that natural PER3 promoter variation functionally tunes its expression, linking sequence polymorphism to transcriptional output.\",\n      \"evidence\": \"Luciferase reporter assays with allele combinations and deletion mapping of enhancer regions\",\n      \"pmids\": [\"20469812\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trans-acting factors binding the mapped enhancers not identified\", \"Reporter assays not validated at endogenous locus\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Confirmed in a genetic model that PER3 shapes sleep-wake timing and homeostatic recovery, corroborating human findings in mouse.\",\n      \"evidence\": \"Per3 knockout mice with wheel-running and EEG phenotyping before and after 6-hour sleep deprivation\",\n      \"pmids\": [\"21957163\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular pathway driving altered delta activity not defined\", \"Brain region responsible not localized\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Implicated PER3 dosage in chemotherapy-induced apoptosis, opening its role in cancer cell survival.\",\n      \"evidence\": \"siRNA knockdown in gingival cancer cells with apoptosis assays and Western blot after cisplatin\",\n      \"pmids\": [\"21459569\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking PER3 to apoptotic machinery not defined\", \"Single cell line\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified a cis-acting promoter variant controlling Per3 abundance through Nrf2 binding, connecting PER3 regulation to stress and alcohol responses.\",\n      \"evidence\": \"eQTL mapping in BXD mouse strains, allele-specific protein-binding assays, ethanol and restraint stress protocols\",\n      \"pmids\": [\"22832735\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct Nrf2 occupancy at endogenous promoter not shown\", \"Functional consequence of altered hippocampal Per3 unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated using a humanized model that the PER3 VNTR selectively alters sleep-homeostasis gene expression without perturbing clock genes, mechanistically separating PER3's sleep role from timekeeping.\",\n      \"evidence\": \"Humanized VNTR knock-in mice, EEG recording, sleep deprivation, microarray of hypothalamus and cortex\",\n      \"pmids\": [\"24577121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the VNTR alters Homer1/Ptgs2/Kcna2 expression is unknown\", \"Causal effector among differentially expressed genes not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed PER3 acts as a tumor suppressor in colorectal cancer and is directly repressed by miR-103, establishing post-transcriptional control of its function.\",\n      \"evidence\": \"Luciferase reporter of miR-103 targeting PER3 3'UTR, miR-103 overexpression, apoptosis assays\",\n      \"pmids\": [\"24393525\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream apoptotic mediators of PER3 not identified\", \"Single cancer context\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Found PER3 contributes to acute behavioral suppression by light during photoperiod adaptation, distinguishing a light-response function.\",\n      \"evidence\": \"Per3 knockout mice with running-wheel activity under varying photoperiods\",\n      \"pmids\": [\"24982860\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between PER3 and light masking unknown\", \"Neural circuit not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed PER3 transcription under control of TFEB acting on CLOCK/BMAL1, revealing a glucose-responsive and PER3-specific regulatory input.\",\n      \"evidence\": \"Co-IP of TFEB with CLOCK/BMAL1, TFEB loss-of-function in liver, luciferase reporters with glucose treatment\",\n      \"pmids\": [\"27373683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Why TFEB selectively regulates PER3 over other PER/CRY genes unexplained\", \"Physiological output of glucose-TFEB-PER3 axis not measured\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined PER3's suppression of cancer stem-cell self-renewal through Notch and \\u03b2-catenin pathways.\",\n      \"evidence\": \"Overexpression and knockdown in colorectal cancer stem-like cells with colony/self-renewal assays and Western blot for Notch/\\u03b2-catenin components\",\n      \"pmids\": [\"27983919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PER3 acts directly on Notch/WNT components or indirectly is unresolved\", \"No in vivo tumor data\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established PER3/BMAL1 as direct transcriptional regulators of Klf15 that restrain adipogenesis, defining a concrete clock-output mechanism.\",\n      \"evidence\": \"Per3 knockout mice, ChIP showing PER3/BMAL1 binding to the Klf15 promoter, in vivo adipogenesis assays\",\n      \"pmids\": [\"29186676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PER3 cooperates with BMAL1 mechanistically at the promoter is undefined\", \"Tissue specificity of the PER3-Klf15 axis not mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linked PER3 deficiency to mood-relevant behavior under light stress, broadening its physiological reach.\",\n      \"evidence\": \"Per3 knockout mice with sucrose preference test, dim-light-at-night protocol, imipramine rescue\",\n      \"pmids\": [\"28071711\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular pathway connecting PER3 to anhedonia not identified\", \"Relationship to circadian phenotypes unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Quantified differential PER3 induction by ARNTL2/NPAS2 versus ARNTL/NPAS2 dimers and antagonism by DEC2, refining the transcriptional inputs to PER3.\",\n      \"evidence\": \"Transfection of clock factors in HEK293 cells with reporter assays and RT-qPCR\",\n      \"pmids\": [\"30210560\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous relevance of ARNTL2/NPAS2 to PER3 not tested\", \"DEC2 mechanism of blockade not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed a developmental role for PER3 in cortical neuron migration and morphogenesis, beyond its clock and cancer functions.\",\n      \"evidence\": \"In utero electroporation knockdown with RNAi-resistant rescue, in situ hybridization, imaging of migration and dendrite/axon morphology\",\n      \"pmids\": [\"30971765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular effectors of PER3 in migrating neurons unknown\", \"Whether this role depends on clock partners untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected PER3 to adipogenesis through direct miR-181a targeting, reinforcing post-transcriptional control of its metabolic function.\",\n      \"evidence\": \"Luciferase reporter of direct targeting, miR-181a gain- and loss-of-function, adipogenesis assays in stromal cells\",\n      \"pmids\": [\"30670712\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether miR-181a-PER3 converges on the Klf15 pathway not tested\", \"In vivo relevance not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Positioned PER3 as the downstream effector of a RUNX3/circMETTL3/miR-107 tumor-suppressive axis in colorectal cancer.\",\n      \"evidence\": \"Biotin pulldown, RIP, dual luciferase, ChIP/EMSA for RUNX3/METTL3 promoter, and xenograft model\",\n      \"pmids\": [\"35710754\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of PER3 tumor suppression downstream of this axis not detailed\", \"Single cancer type\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a direct molecular mechanism for PER3 tumor suppression: PAS1-domain binding to HIF-1\\u03b1 driving its ubiquitination and degradation to block metastasis.\",\n      \"evidence\": \"Co-IP with domain mapping, ubiquitination assay, bisulfite pyrosequencing of PER3 promoter methylation, and xenograft with decitabine/LW6\",\n      \"pmids\": [\"39733745\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PER3 recruits an E3 ligase or acts as adaptor is unresolved\", \"Single cancer model\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified GLYR1 as a direct transcriptional activator of PER3 mediating its tumor-suppressive effect in myeloma.\",\n      \"evidence\": \"Luciferase and ChIP for GLYR1 binding to PER3 promoter, PER3 knockdown/overexpression epistasis, viability/migration assays\",\n      \"pmids\": [\"38642856\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream PER3 effectors in myeloma not defined\", \"GLYR1-PER3 axis not validated in vivo\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked a coding PER3 variant to pigmentary disease by showing it promotes melanin synthesis and melanocyte proliferation.\",\n      \"evidence\": \"Whole-exome and Sanger sequencing of a DUH family, in vitro melanin assays, and zebrafish melanocyte proliferation phenotyping\",\n      \"pmids\": [\"36790533\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which p.P173S alters melanin synthesis unknown\", \"Independence from circadian function not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PER3's molecular activities — checkpoint scaffolding, HIF-1\\u03b1 degradation, and transcriptional co-regulation — mechanistically connect to its defining sleep-homeostatic phenotype remains unresolved.\",\n      \"evidence\": \"No timeline study unifies the biochemical and behavioral functions of PER3\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of PER3 domains in any complex\", \"The effector linking the VNTR to slow-wave sleep is unidentified\", \"Whether PER3's tumor-suppressive and sleep roles share a mechanism is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [2, 3, 4, 9]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [16, 6, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BMAL1\", \"ATM\", \"CHK2\", \"HIF-1\\u03b1\", \"TFEB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}