{"gene":"NPAS2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2001,"finding":"NPAS2 forms an obligate heterodimer with BMAL1 to bind E-box DNA elements and activate transcription of Per1, Per2, and Cry1 genes while repressing BMAL1; this was demonstrated by conditional co-induction of NPAS2 and BMAL1 in a neuroblastoma cell line with downstream target gene identification.","method":"Conditional induction cell line, representational difference analysis, DNA microarrays, Northern blotting","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional expression system with multiple orthogonal readouts, replicated by subsequent studies","pmids":["11441147"],"is_preprint":false},{"year":2001,"finding":"The DNA-binding activity of NPAS2:BMAL1 heterodimers is regulated by the redox state of NAD cofactors: reduced forms NAD(H) and NADP(H) strongly enhance DNA binding, while oxidized forms inhibit it, demonstrated in a purified reconstituted system.","method":"Purified protein DNA-binding assay (electrophoretic mobility shift / in vitro reconstitution)","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified reconstituted system, replicated by subsequent in vitro work","pmids":["11441146"],"is_preprint":false},{"year":2001,"finding":"Nuclear receptors RARα and RXRα physically interact with NPAS2 (MOP4) and negatively regulate NPAS2/BMAL1-mediated transcriptional activation of clock genes in vascular cells; retinoic acid can phase-shift Per2 mRNA rhythmicity.","method":"Co-immunoprecipitation, reporter gene assays, in vivo and in vitro phase-shifting experiments","journal":"Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction shown and functional consequence demonstrated, single lab","pmids":["11439184"],"is_preprint":false},{"year":2002,"finding":"Both PAS-A and PAS-B domains of NPAS2 bind heme as a prosthetic group; heme-loaded (holo) NPAS2:BMAL1 heterodimers lose DNA-binding activity upon exposure to low micromolar carbon monoxide, which drives formation of inactive BMAL1 homodimers at the expense of NPAS2:BMAL1 heterodimers; apo-NPAS2 (heme-free) is insensitive to CO.","method":"In vitro heme-binding assays, DNA-binding assays with CO titration, reconstituted purified protein system","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified reconstituted system with multiple orthogonal methods and mechanistic controls (apo vs holo)","pmids":["12446832"],"is_preprint":false},{"year":2000,"finding":"NPAS2 is a bHLH-PAS transcription factor expressed in multiple regions of the vertebrate brain; targeted disruption producing an NPAS2-lacZ fusion (lacking the bHLH domain) causes deficits in long-term memory in cued and contextual fear tasks, establishing a functional role in memory acquisition.","method":"Targeted gene disruption (lacZ knock-in), behavioral testing (fear conditioning)","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic loss-of-function with specific behavioral phenotype, McKnight lab foundational paper","pmids":["10864874"],"is_preprint":false},{"year":2003,"finding":"NPAS2-deficient mice show altered locomotor activity, disrupted sleep patterns, and impaired adaptability to food-restricted entrainment, demonstrating that NPAS2 is required for normal circadian behavioral outputs and food-entrainable oscillator function.","method":"NPAS2 knockout mouse model, locomotor activity monitoring, polysomnography, food restriction paradigm","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple specific behavioral readouts, replicates forebrain clock function","pmids":["12843397"],"is_preprint":false},{"year":2006,"finding":"CRY1 and CRY2 stabilize unphosphorylated forms of CLOCK/NPAS2 and BMAL1 and promote their nuclear accumulation, but inhibit their transcriptional activity without affecting NPAS2/BMAL1 complex formation or DNA binding; this establishes CRY-mediated post-translational regulation of the NPAS2/BMAL1 complex.","method":"Ectopic co-expression, immunofluorescence localization, reporter assays, analysis of Cry double-KO mouse tissues","journal":"Cell Cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (co-expression, localization, reporter, KO tissue), single lab","pmids":["16628007"],"is_preprint":false},{"year":2006,"finding":"NPAS2 spectroscopic characterization shows that the bHLH domain assists stable heme binding to the PAS-A domain; the heme-bound bHLH-PAS-A domain dimerizes in solution and binds specifically to E-box DNA sequences only in the presence of heme, as measured by quartz-crystal microbalance.","method":"Optical absorption spectroscopy, resonance Raman spectroscopy, heme-binding kinetics, quartz-crystal microbalance DNA-binding assay","journal":"The FEBS Journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple biophysical methods on purified domain, direct structure-function link established, single lab","pmids":["16704425"],"is_preprint":false},{"year":2006,"finding":"NPAS2 plays a role in non-rapid eye movement sleep homeostasis: Npas2-/- mice show reduced EEG spindle activity during NREMS and altered delta frequency activity; the wake-dependent increase in cortical Per2 expression is attenuated in Npas2-/- mice, placing NPAS2 upstream of Per2 induction by sleep deprivation.","method":"Npas2 knockout mice, EEG recording, sleep deprivation, cortical gene expression analysis","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with quantitative EEG and molecular readouts, McKnight lab","pmids":["16636276"],"is_preprint":false},{"year":2008,"finding":"Mutation of the heme axial ligand residues His119 or His171 in the PAS-A domain of NPAS2 markedly reduces transcriptional activity of the mouse Per1 promoter and impairs NPAS2:BMAL1 heterodimer formation and E-box DNA binding, establishing these residues as essential for heme-dependent transcriptional control.","method":"Site-directed mutagenesis, reporter gene assay (NIH3T3 cells), gel-shift/EMSA","journal":"Biochemical and Biophysical Research Communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with functional reporter and DNA-binding assays, directly links heme coordination to transcriptional activity","pmids":["18230344"],"is_preprint":false},{"year":2008,"finding":"CLOCK and NPAS2 have overlapping roles as transcriptional activators in peripheral (liver) circadian oscillators: FVII mRNA rhythmicity is abolished only in Clock-/-;Npas2-/- double-knockout mice, not in single knockouts; reporter assays confirm both NPAS2:BMAL1 and CLOCK:BMAL1 transactivate the FVII promoter via E-boxes, and this activity is repressed by PER2 and CRY1.","method":"Clock/Npas2 single and double knockout mice, reporter gene assays, E-box mutagenesis","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic epistasis with double KO, reporter assays with E-box mutagenesis, multiple models","pmids":["18316400"],"is_preprint":false},{"year":2008,"finding":"RNAi-mediated depletion of NPAS2 causes failure of expected cell cycle delay after mutagen treatment and impairs DNA repair capacity (comet assay), and represses expression of multiple cell cycle and DNA repair genes, implicating NPAS2 as a regulator of DNA damage response pathways.","method":"RNA interference, cell cycle analysis, comet assay, PCR expression array","journal":"Molecular Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with multiple functional readouts (cell cycle, DNA repair, gene expression), single lab","pmids":["18819933"],"is_preprint":false},{"year":2009,"finding":"Genome-wide ChIP-on-chip analysis identified 16 direct transcriptional target genes bound by NPAS2 in MCF-7 cells, including cancer-related genes CDC25A, CDKN2AIP, CX3CL1, ELF4, and others containing NPAS2 binding regions.","method":"ChIP-on-chip (chromatin immunoprecipitation coupled to microarray), real-time PCR validation","journal":"Cancer Letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP with PCR validation of targets, single lab","pmids":["19457610"],"is_preprint":false},{"year":2010,"finding":"NPAS2 gene expression is directly regulated by the nuclear receptors RORα and REV-ERBα through functional RORE elements in the NPAS2 promoter, coordinating NPAS2 expression with BMAL1 as the positive arm of the circadian feedback loop.","method":"ChIP/microarray screen for RORα and REV-ERBα occupancy, RORE mutagenesis, reporter assays, siRNA knockdown","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP occupancy, promoter mutagenesis, and functional knockdown with multiple orthogonal methods, single lab","pmids":["20817722"],"is_preprint":false},{"year":2011,"finding":"Sleep deprivation decreases DNA binding of NPAS2 and BMAL1 to the Per2 promoter in mouse cerebral cortex (by ChIP), demonstrating that sleep-wake history directly modulates NPAS2 chromatin occupancy and thereby alters Per2 expression.","method":"Chromatin immunoprecipitation (ChIP), qPCR, time-of-day fractionation","journal":"PLOS ONE","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ChIP measurement in vivo, single lab with multiple time points","pmids":["22039518"],"is_preprint":false},{"year":2011,"finding":"The bHLH domain shifts the heme axial coordination in the PAS-A domain of NPAS2 from a Cys170/His119 equilibrium to a predominant His119/His171 bis-histidyl coordination, demonstrating interdomain regulation of heme coordination structure relevant to signal transduction.","method":"Resonance Raman spectroscopy, site-directed mutagenesis of Cys170, His119, His171 in bHLH-PAS-A domain","journal":"Journal of Inorganic Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with resonance Raman spectroscopy on purified domain, clear structure-function result, single lab","pmids":["22245004"],"is_preprint":false},{"year":2013,"finding":"The NAD(P)H interaction site of NPAS2 maps to the N-terminal 61 residues of the bHLH domain; this minimal fragment forms a heterodimer with BMAL1 and supports NAD(P)H-enhanced DNA binding; NAD(P)+ does not inhibit NPAS2 DNA binding in this purified system, suggesting enhancement by reduced cofactor is the primary regulatory mechanism.","method":"Electrophoretic mobility shift assay (EMSA) with truncation mutants, purified recombinant proteins","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution with defined truncations, single lab, single method","pmids":["23831463"],"is_preprint":false},{"year":2013,"finding":"Circadian transcription of the Npas2 gene is controlled cell-autonomously by RORα binding to a specific RORE in the Npas2 upstream promoter; dominant-negative RORα, RORα siRNA, or RORα-mutant (sg/sg) fibroblasts all dampen Npas2 transcriptional oscillation.","method":"Luciferase reporter with RORE mutagenesis, dominant negative construct, siRNA, RORα-mutant mouse embryonic fibroblasts","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — promoter mutagenesis and genetic model converge on same conclusion, single lab","pmids":["24196956"],"is_preprint":false},{"year":2014,"finding":"NPAS2 directly transcriptionally regulates the Drd3 dopamine receptor gene in the nucleus accumbens (NAc); NPAS2 expression is restricted to Drd1-expressing neurons in the NAc; NPAS2 knockdown in the NAc disrupts Drd3 diurnal rhythm and reduces cocaine conditioned place preference, while CLOCK knockdown in NAc has no effect, revealing a distinct non-redundant role for NPAS2.","method":"AAV-shRNA knockdown in NAc, ChIP-seq, cell sorting qRT-PCR, conditioned place preference assay","journal":"Biological Psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — region-specific knockdown, ChIP-seq for direct binding, cell-type characterization, behavioral output with CLOCK comparison","pmids":["25444159"],"is_preprint":false},{"year":2016,"finding":"NPAS2 compensates for loss of CLOCK in peripheral circadian oscillators: in CLOCK-deficient fibroblasts, Npas2 knockdown leads to arrhythmicity, demonstrating that NPAS2 maintains autonomous circadian rhythms in peripheral cells (not only in SCN neurons).","method":"Single-cell bioluminescence imaging (PER2::LUC), Npas2 siRNA knockdown in CLOCK-deficient fibroblasts","journal":"PLoS Genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — live single-cell imaging with genetic knockdown, clean epistasis demonstrating functional redundancy","pmids":["26895328"],"is_preprint":false},{"year":2017,"finding":"NPAS2 promotes HCC cell survival by transcriptionally upregulating CDC25A phosphatase through E-box elements in the CDC25A promoter (with BMAL1 as obligate heterodimer), leading to dephosphorylation of CDK2/4/6 (promoting proliferation) and Bcl-2 (inhibiting apoptosis).","method":"ChIP, luciferase reporter with E-box mutagenesis, Co-IP (NPAS2-BMAL1 interaction), in vitro and in vivo tumor models","journal":"Cell Death & Disease","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct ChIP binding, E-box mutagenesis, Co-IP for complex, downstream phosphorylation targets identified, in vivo validation","pmids":["28333141"],"is_preprint":false},{"year":2017,"finding":"NPAS2 is identified as a direct transcriptional target of Gabra genes in striatum; Npas2 null mutant mice show reduced sensitivity to the GABA-A receptor positive allosteric modulator diazepam, and NAc-specific Npas2 knockdown reduces Gabra1 expression, linking NPAS2 to GABAergic neurotransmission.","method":"Global Npas2 knockout, NAc-specific AAV-shRNA knockdown, elevated plus maze/light-dark/open field behavioral assays, qPCR","journal":"Frontiers in Molecular Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — region-specific knockdown with molecular and behavioral readouts, single lab","pmids":["29163035"],"is_preprint":false},{"year":2010,"finding":"CLOCK and NPAS2 both bind the Aanat promoter E-box in situ (by ChIP) in chicken photoreceptors; knockdown of CLOCK reduces circadian expression of Npas2, Per2, and Aanat, while NPAS2 knockdown dampens Aanat rhythm without affecting other clock genes, demonstrating overlapping but hierarchically distinct roles.","method":"Gene-specific miRNA knockdown vectors, ChIP, real-time PCR in photoreceptor-enriched cultures","journal":"Journal of Neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in situ ChIP and targeted knockdown, ortholog in chicken (consistent with mammalian function)","pmids":["20345751"],"is_preprint":false},{"year":2019,"finding":"NPAS2 directly transcriptionally activates HIF-1α, which mediates upregulation of glycolytic genes (GLUT1, HK2, GPI, ALDOA, ENO2, PKM2, MCT4) and downregulation of PGC-1α (mitochondrial biogenesis), promoting Warburg-type glucose metabolism reprogramming in HCC cells.","method":"NPAS2 overexpression/knockdown, ChIP, luciferase reporter, in vitro and in vivo metabolic assays","journal":"Cancer Letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct binding, reporter assays, in vitro/in vivo metabolic readouts, single lab","pmids":["31765736"],"is_preprint":false},{"year":2019,"finding":"NPAS2 contributes to liver fibrosis by directly transcriptionally activating Hes1 (a Notch signaling transcription factor) in hepatic stellate cells, promoting their activation; NPAS2 is upregulated in HSCs after fibrogenic injury.","method":"ChIP, luciferase reporter, NPAS2 overexpression/knockdown in HSCs, mouse fibrosis model","journal":"Molecular Therapy: Nucleic Acids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ChIP and reporter assays with in vivo fibrosis model, single lab","pmids":["31778954"],"is_preprint":false},{"year":2019,"finding":"NPAS2 expression is restricted to Drd1-expressing D1R-MSNs in the NAc; NPAS2 negatively regulates excitatory synaptic transmission onto D1R-MSNs specifically; cell-type-specific Npas2 knockdown in D1R-MSNs (but not D2R-MSNs) reduces cocaine conditioned place preference and blocks cocaine-induced synaptic potentiation.","method":"Cre-inducible shRNA virus, Drd1a-tdTomato mouse line, whole-cell electrophysiology, conditioned place preference","journal":"Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific genetic manipulation with electrophysiology and behavior, replicated in multiple mouse models","pmids":["30962277"],"is_preprint":false},{"year":2017,"finding":"The ARNTL2/NPAS2 heterodimer is a weaker activator of PER3 and DBP than the ARNTL/NPAS2 heterodimer in HEK293 cells; DEC2 blocks the transcriptional effect of the ARNTL2/NPAS2 dimer; TNF induces ARNTL2 nuclear localization and upregulates both ARNTL2 and NPAS2 via NF-κB.","method":"Transfection in HEK293 cells, RT-qPCR, immunofluorescence, IKK-2 inhibitor (NF-κB pathway)","journal":"Journal of Circadian Rhythms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter/expression assays with pathway inhibitor, single lab","pmids":["30210560"],"is_preprint":false},{"year":2022,"finding":"NPAS2 transcriptionally regulates diurnal expression of hepatic CYP1A2 by binding to an E-box-like element at -416 bp in the Cyp1a2 promoter; Npas2-/- mice show decreased CYP1A2 mRNA, protein, and enzymatic activity with abolished rhythmicity.","method":"Npas2 knockout mice, luciferase reporter assays, ChIP-seq, probe substrate pharmacokinetics in vivo","journal":"Biochemical Pharmacology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP-seq for direct binding, E-box reporter, KO mouse with both molecular and enzymatic readouts, single lab","pmids":["36379250"],"is_preprint":false},{"year":2022,"finding":"NPAS2 and SIRT1 physically interact in the nucleus accumbens (by Co-IP); both show diurnal expression in NAc that is altered by cocaine; cross-analysis of NPAS2 and SIRT1 ChIP-seq identifies shared reward-relevant gene targets; NAc-specific Npas2 knockdown attenuates SIRT1-mediated increases in cocaine preference.","method":"Co-immunoprecipitation, ChIP-seq, NAc-specific AAV knockdown, cocaine conditioned place preference","journal":"European Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for physical interaction, ChIP-seq for shared targets, in vivo behavioral epistasis, single lab","pmids":["35001440"],"is_preprint":false},{"year":2021,"finding":"NPAS2 interacts with CRY2 (by Co-IP in cardiomyocytes) and directly acts on the CX3CL1 promoter as a transcriptional activator; overexpression of NPAS2 ameliorates myocardial ischemia/reperfusion injury via CX3CL1-AKT/mTOR regulation of autophagy.","method":"Co-immunoprecipitation, luciferase reporter (CX3CL1 promoter), adenoviral overexpression, rat I/R model","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for CRY2 interaction, reporter for CX3CL1 activation, in vivo rescue with pathway inhibition, single lab","pmids":["34460437"],"is_preprint":false},{"year":2024,"finding":"NPAS2 enhances the stability of H2AX mRNA by binding to it, thereby upregulating the DNA damage repair pathway (specifically homology-directed repair); depletion of NPAS2 reduces γH2AX accumulation and sensitizes lung adenocarcinoma cells to cisplatin.","method":"NPAS2 knockdown, mRNA sequencing, γH2AX immunostaining, HDR assay, in vivo cisplatin treatment","journal":"Cell Death & Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with molecular (mRNA stability, γH2AX) and functional (HDR) readouts, in vivo confirmation, single lab","pmids":["38291048"],"is_preprint":false},{"year":2023,"finding":"p53 transcriptionally activates NPAS2 in alveolar type II epithelial cells; NPAS2 in turn promotes epithelial-mesenchymal transition by positively regulating HES1 expression; NPAS2 overexpression weakens the effects of TP53 knockdown on EMT.","method":"Reporter assays, siRNA knockdown of TP53/NPAS2, overexpression, mouse bleomycin fibrosis model","journal":"Cellular Signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis between p53, NPAS2, and HES1 with in vivo model, single lab","pmids":["37406788"],"is_preprint":false},{"year":2018,"finding":"Npas2 expression in bone marrow stromal cells (BMSC) is induced by rough-surface Ti implants via α2-adrenergic receptor/cAMP/CREB signaling; Npas2 functional knockout mice show impaired osseointegration of rough-surface implants with abnormal collagen architecture, establishing a neuroskeletal role for NPAS2.","method":"Npas2 KO mouse implant model, implant push-out test, high-throughput chemical screen with Npas2-reporter, α2-adrenergic receptor expression analysis","journal":"Biomaterials","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO model with mechanical and histological readouts, upstream pathway identified by chemical screen, single lab","pmids":["30428407"],"is_preprint":false},{"year":2025,"finding":"In vascular smooth muscle cells (VSMCs), NPAS2 transcriptionally represses LPCAT3 (a phospholipid remodeling enzyme); NPAS2 depletion elevates PC-PUFA2S (phosphatidylcholines with two polyunsaturated fatty acyl chains), promoting ferroptosis-induced VSMC phenotypic switching and accelerating ascending thoracic aortic aneurysm; VSMC-specific NPAS2 KO mice exhibit aggravated ATAA.","method":"VSMC-specific NPAS2 knockout mice, ChIP/reporter assays (LPCAT3 promoter), lipidomics (PC-PUFA2S), ferroptosis assays, PDGF-BB-treated HASMCs","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — preprint, VSMC-specific KO with lipidomics and ferroptosis readouts, direct transcriptional repression of LPCAT3 shown, single lab not yet peer-reviewed","pmids":["bio_10.1101_2025.09.23.677952"],"is_preprint":true},{"year":2026,"finding":"NPAS2 in medial prefrontal cortex (mPFC) transcriptionally activates POU2F2, a transcriptional repressor that downregulates tyrosine hydroxylase (TH) expression, reducing dopamine synthesis in mPFC TH+ neurons during nap hours; mPFC-specific NPAS2 manipulation alters nap behavior in mice.","method":"Region-specific NPAS2 manipulation (mPFC), ChIP/reporter for POU2F2-TH pathway, electrophysiology of TH+ neurons, behavioral nap analysis","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway defined through direct molecular steps (NPAS2→POU2F2→TH), region-specific manipulation, electrophysiology, multiple orthogonal methods","pmids":["41839866"],"is_preprint":false},{"year":2025,"finding":"In hypertrophic scar fibroblasts, NPAS2 binds to an E-like-box in the CDC25A promoter to transcriptionally activate CDC25A, promoting fibroblast proliferation and migration; in vivo knockdown of NPAS2 in rat tail wounds inhibits hypertrophic scar formation.","method":"Dual-luciferase reporter assay, ChIP, gain/loss-of-function in HDFs and HTS-Fs, in vivo rat wound model with AAV knockdown","journal":"Journal of Cellular and Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ChIP and E-box reporter, in vivo wound model, single lab","pmids":["40548841"],"is_preprint":false},{"year":2025,"finding":"FTO (m6A demethylase) reduces m6A modification of Npas2 mRNA through a Prrc2a-dependent mechanism, decreasing Npas2 mRNA stability; Npas2 upregulates HIF-1α signaling to drive M1 macrophage glycolysis and inflammation in diabetic nephropathy.","method":"MeRIP-seq, transcriptome analysis, Fto loss/gain-of-function, Prrc2a dependence, db/db mouse model","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epitranscriptomic mechanism (MeRIP-seq), multiple functional readouts, single lab","pmids":["39831513"],"is_preprint":false}],"current_model":"NPAS2 is a bHLH-PAS transcription factor that forms obligate heterodimers with BMAL1 (and ARNTL2) to bind E-box elements and drive circadian gene expression in the forebrain and peripheral tissues; its DNA-binding activity is positively regulated by reduced NAD(P)H cofactors and by heme bound to its PAS-A and PAS-B domains, with carbon monoxide inhibiting holo-NPAS2 by promoting inactive BMAL1 homodimers; it is post-translationally regulated by CRY1/2 (stabilizing unphosphorylated nuclear forms while inhibiting transcriptional activity) and transcriptionally regulated by RORα and REV-ERBα via RORE elements; direct transcriptional targets include Per1/Per2/Cry1, CDC25A, Drd3, CX3CL1, HIF-1α, HES1, Gabra genes, CYP1A2, LPCAT3, POU2F2/TH, and others, linking NPAS2 to sleep homeostasis, memory, reward/addiction, DNA damage response, metabolic reprogramming, and tissue fibrosis."},"narrative":{"mechanistic_narrative":"NPAS2 is a bHLH-PAS transcription factor that forms an obligate heterodimer with BMAL1 to bind E-box DNA elements and drive the positive arm of the circadian transcriptional feedback loop, activating Per1, Per2, and Cry1 while repressing BMAL1 [PMID:11441147]. Its own expression oscillates under control of the nuclear receptors RORα and REV-ERBα acting through RORE elements in the Npas2 promoter [PMID:20817722, PMID:24196956]. The heterodimer's DNA-binding activity is gated by cellular redox and gas-sensing inputs: reduced NAD(P)H cofactors strongly enhance binding through a site in the N-terminal bHLH domain [PMID:11441146, PMID:23831463], while both PAS-A and PAS-B domains bind heme as a prosthetic group, and heme-loaded NPAS2:BMAL1 loses DNA binding upon carbon monoxide exposure, which favors inactive BMAL1 homodimers [PMID:12446832]; the bHLH domain assists stable heme binding and tunes the PAS-A axial coordination, and mutation of the His119/His171 axial ligands cripples heterodimer formation, E-box binding, and transactivation [PMID:16704425, PMID:18230344, PMID:22245004]. CRY1/2 post-translationally regulate the complex by stabilizing unphosphorylated nuclear forms while inhibiting transcriptional activity without disrupting DNA binding [PMID:16628007]. NPAS2 functions partially redundantly with CLOCK in both forebrain and peripheral oscillators—double knockout is required to abolish rhythmic peripheral targets, and NPAS2 sustains autonomous rhythms in CLOCK-deficient fibroblasts [PMID:18316400, PMID:26895328]—yet it also has non-redundant roles, particularly in brain reward circuitry where it acts in D1R-expressing accumbens neurons to regulate Drd3 and excitatory transmission and to drive cocaine-conditioned behavior [PMID:25444159, PMID:30962277]. At the organismal level NPAS2 governs long-term memory, sleep homeostasis, and food-entrainable behavior [PMID:10864874, PMID:12843397, PMID:16636276]. Beyond its core clock role, NPAS2 acts as a direct transcriptional regulator in diverse disease contexts, activating CDC25A, HIF-1α, HES1, and CX3CL1 to promote proliferation, glycolytic metabolic reprogramming, fibrosis, and cell survival [PMID:28333141, PMID:31765736, PMID:31778954, PMID:37406788], and it can stabilize H2AX mRNA to support DNA damage repair [PMID:38291048].","teleology":[{"year":2000,"claim":"Established NPAS2 as a brain-expressed bHLH-PAS transcription factor with a defined physiological role, answering whether the gene has a non-redundant function in vivo.","evidence":"Targeted lacZ knock-in disrupting the bHLH domain with fear-conditioning behavior in mice","pmids":["10864874"],"confidence":"High","gaps":["Did not identify molecular partners or target genes","Mechanism linking NPAS2 to memory not resolved"]},{"year":2001,"claim":"Defined the core molecular activity of NPAS2 as an obligate BMAL1 heterodimer that binds E-boxes to activate clock genes, and showed its DNA binding is gated by NAD cofactor redox state—linking transcription to metabolic status.","evidence":"Conditional co-induction cell line with target identification; purified reconstituted DNA-binding assays with NAD(P)H/NAD(P)+ titration","pmids":["11441147","11441146"],"confidence":"High","gaps":["Physiological source of redox signal in vivo unresolved","Structural basis of cofactor enhancement not defined at this stage"]},{"year":2001,"claim":"Identified nuclear receptor crosstalk by showing RARα/RXRα physically bind NPAS2 and repress its activity, connecting retinoid signaling to clock phase.","evidence":"Co-IP, reporter assays, and phase-shifting experiments in vascular cells","pmids":["11439184"],"confidence":"Medium","gaps":["Single lab","Physiological relevance to central clock not established"]},{"year":2002,"claim":"Revealed NPAS2 as a heme- and gas-sensing transcription factor, answering how environmental/metabolic gases could modulate the clock: holo-NPAS2 loses DNA binding under CO via BMAL1 homodimer formation.","evidence":"In vitro heme-binding and CO-titration DNA-binding assays comparing apo vs holo protein","pmids":["12446832"],"confidence":"High","gaps":["In vivo source and concentration of CO acting on NPAS2 unclear","Whether heme occupancy is dynamic in cells not addressed"]},{"year":2003,"claim":"Demonstrated NPAS2 is required for circadian behavioral outputs and food-entrainable oscillation, establishing it as a functional forebrain clock component.","evidence":"Npas2 knockout mice with locomotor monitoring, polysomnography, and food-restriction paradigm","pmids":["12843397"],"confidence":"High","gaps":["Did not separate forebrain from peripheral contributions","Redundancy with CLOCK not yet tested"]},{"year":2006,"claim":"Resolved the structural basis of heme sensing and defined CRY-mediated post-translational control, showing the bHLH domain assists heme binding and that CRY1/2 stabilize the complex while repressing its activity.","evidence":"Resonance Raman/optical spectroscopy and QCM DNA binding on purified domains; co-expression, localization, reporter, and Cry double-KO tissue analysis","pmids":["16704425","16628007"],"confidence":"Medium","gaps":["CRY regulation shown in single lab","Coupling between heme state and CRY regulation not integrated"]},{"year":2006,"claim":"Placed NPAS2 upstream of activity-dependent Per2 induction in the cortex, mechanistically linking it to NREM sleep homeostasis.","evidence":"EEG recording and sleep deprivation in Npas2 knockout mice with cortical gene expression","pmids":["16636276"],"confidence":"High","gaps":["Direct chromatin mechanism not measured here","Cell types responsible not defined"]},{"year":2008,"claim":"Pinpointed heme axial ligand residues His119/His171 as essential for heterodimer formation, E-box binding, and transactivation, directly tying heme coordination to transcriptional output.","evidence":"Site-directed mutagenesis with reporter and EMSA assays","pmids":["18230344"],"confidence":"High","gaps":["Whether ligand identity changes dynamically in vivo not shown"]},{"year":2008,"claim":"Established functional redundancy with CLOCK in peripheral oscillators via genetic epistasis, answering whether NPAS2 acts only centrally.","evidence":"Clock/Npas2 single and double knockout mice with reporter assays and E-box mutagenesis on the FVII promoter","pmids":["18316400"],"confidence":"High","gaps":["Tissue-specific division of labor between CLOCK and NPAS2 not fully mapped"]},{"year":2008,"claim":"Extended NPAS2 function beyond timekeeping to the DNA damage response, showing its loss impairs cell cycle delay and repair after mutagen exposure.","evidence":"RNAi depletion with cell cycle analysis, comet assay, and expression arrays","pmids":["18819933"],"confidence":"Medium","gaps":["Direct target genes not defined here","Mechanism of repair regulation unresolved"]},{"year":2009,"claim":"Provided a genome-wide map of direct NPAS2 targets, broadening its regulon to cancer-relevant genes including CDC25A and CX3CL1.","evidence":"ChIP-on-chip in MCF-7 cells with qPCR validation","pmids":["19457610"],"confidence":"Medium","gaps":["Functional consequences of most targets not tested","Single cell line"]},{"year":2010,"claim":"Defined how NPAS2 is wired into the feedback loop, showing RORα/REV-ERBα drive its rhythmic transcription through RORE elements, and confirmed conserved overlapping/distinct roles with CLOCK at the Aanat promoter.","evidence":"ChIP occupancy, RORE mutagenesis, reporter, siRNA; targeted miRNA knockdown and ChIP in chicken photoreceptors","pmids":["20817722","20345751"],"confidence":"High","gaps":["Quantitative contribution of each regulator to oscillation amplitude not resolved"]},{"year":2011,"claim":"Connected behavioral state to chromatin, showing sleep deprivation reduces NPAS2/BMAL1 occupancy at the Per2 promoter in vivo, and mapped the NAD(P)H interaction to the N-terminal bHLH region with reduced cofactor as the primary enhancer.","evidence":"In vivo ChIP/qPCR across time of day; EMSA with bHLH truncation mutants","pmids":["22039518","23831463"],"confidence":"Medium","gaps":["Signal upstream of occupancy changes not identified","NAD(P)H truncation work is single-method/single-lab"]},{"year":2012,"claim":"Refined the heme-sensing model by showing the bHLH domain shifts PAS-A axial coordination toward a bis-histidyl His119/His171 state, providing a structural mechanism for interdomain signal transduction.","evidence":"Resonance Raman spectroscopy with mutagenesis of Cys170/His119/His171 on purified bHLH-PAS-A domain","pmids":["22245004"],"confidence":"High","gaps":["Functional consequence of coordination switch in full-length protein in cells not tested"]},{"year":2016,"claim":"Demonstrated NPAS2 can sustain autonomous peripheral rhythms independently, answering whether its redundancy with CLOCK extends to cell-autonomous oscillation.","evidence":"Single-cell PER2::LUC bioluminescence imaging with Npas2 knockdown in CLOCK-deficient fibroblasts","pmids":["26895328"],"confidence":"High","gaps":["Why SCN versus peripheral tissues differ in CLOCK/NPAS2 dependence not resolved"]},{"year":2017,"claim":"Identified non-redundant NPAS2 functions in the reward system and in cancer cell survival, distinguishing it mechanistically from CLOCK in the accumbens and showing CDC25A activation drives proliferation/anti-apoptosis in HCC.","evidence":"NAc AAV-shRNA knockdown, ChIP-seq, conditioned place preference with CLOCK comparison; ChIP, E-box reporter, Co-IP, and tumor models for CDC25A","pmids":["25444159","28333141"],"confidence":"High","gaps":["Basis for CLOCK/NPAS2 functional divergence in NAc unknown","Whether heme/redox gating operates in these non-clock contexts untested"]},{"year":2017,"claim":"Expanded NPAS2's reach to GABAergic neurotransmission and characterized weaker ARNTL2/NPAS2 heterodimer activity plus NF-κB-driven induction, broadening its dimerization and regulatory inputs.","evidence":"Npas2 KO and NAc knockdown with behavioral assays and qPCR; HEK293 transfection, RT-qPCR, immunofluorescence, IKK-2 inhibition","pmids":["29163035","30210560"],"confidence":"Medium","gaps":["Physiological role of ARNTL2/NPAS2 dimer in vivo unclear","Single labs"]},{"year":2019,"claim":"Cemented cell-type-specific accumbens function and broadened the disease regulon, showing NPAS2 acts in D1R-MSNs to control excitatory transmission and cocaine plasticity, and activates HIF-1α and HES1 to drive glycolytic reprogramming and fibrosis.","evidence":"Cre-inducible shRNA with electrophysiology and CPP; ChIP/reporter and in vivo models for HIF-1α (HCC) and Hes1 (hepatic stellate cells)","pmids":["30962277","31765736","31778954"],"confidence":"High","gaps":["How NPAS2 selects context-specific targets not defined","Whether these roles depend on BMAL1 heterodimerization not uniformly tested"]},{"year":2021,"claim":"Demonstrated cardioprotective NPAS2 activity through CX3CL1 transcriptional activation and autophagy regulation, with a physical CRY2 interaction in cardiomyocytes.","evidence":"Co-IP, CX3CL1 reporter, adenoviral overexpression in a rat ischemia/reperfusion model","pmids":["34460437"],"confidence":"Medium","gaps":["Single lab","Endogenous (non-overexpression) contribution not established"]},{"year":2022,"claim":"Linked NPAS2 to xenobiotic metabolism rhythmicity, showing it directly drives diurnal hepatic CYP1A2 expression and enzymatic activity.","evidence":"Npas2 KO mice, ChIP-seq, E-box reporter, and probe-substrate pharmacokinetics","pmids":["36379250"],"confidence":"High","gaps":["Generality across other CYP genes not assessed"]},{"year":2022,"claim":"Identified SIRT1 as a physical and functional NPAS2 partner in the accumbens, integrating a deacetylase into reward-relevant transcriptional control.","evidence":"Co-IP, overlapping ChIP-seq target analysis, NAc knockdown, and cocaine CPP epistasis","pmids":["35001440"],"confidence":"Medium","gaps":["Whether SIRT1 deacetylates NPAS2 directly not shown","Single lab"]},{"year":2024,"claim":"Uncovered a non-transcriptional NPAS2 activity—mRNA binding/stabilization of H2AX—mechanistically supporting homology-directed repair and chemoresistance.","evidence":"NPAS2 knockdown, mRNA-seq, γH2AX immunostaining, HDR assay, and in vivo cisplatin treatment in lung adenocarcinoma","pmids":["38291048"],"confidence":"Medium","gaps":["RNA-binding domain/specificity not mapped","Relationship to its DNA-binding clock role unresolved"]},{"year":2025,"claim":"Extended NPAS2 as a transcriptional repressor of lipid remodeling (LPCAT3) controlling ferroptosis and vascular disease, and a regulator of macrophage glycolysis via FTO/m6A-controlled stability feeding into HIF-1α.","evidence":"VSMC-specific KO mice with ChIP/reporter, lipidomics, ferroptosis assays (preprint); MeRIP-seq and db/db model for FTO/Prrc2a regulation","pmids":["bio_10.1101_2025.09.23.677952","39831513"],"confidence":"Medium","gaps":["LPCAT3 study is an unreviewed preprint","Whether repression requires BMAL1 heterodimer not addressed"]},{"year":2026,"claim":"Defined a circuit-level NPAS2 pathway in mPFC—NPAS2→POU2F2→TH—linking the clock factor to dopamine synthesis control and nap behavior.","evidence":"Region-specific mPFC manipulation, ChIP/reporter, electrophysiology of TH+ neurons, and behavioral nap analysis","pmids":["41839866"],"confidence":"High","gaps":["Whether this pathway requires canonical E-box/BMAL1 dimerization not specified"]},{"year":null,"claim":"How NPAS2 selects between its canonical BMAL1-dependent E-box transcription and context-specific or non-transcriptional activities (e.g., mRNA stabilization, repression) across tissues remains unresolved, and the in vivo role of heme/redox/CO gating in non-clock disease contexts is undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model connecting heme/redox sensing to disease-context targets","RNA-binding versus DNA-binding mode switching unexplained","Tissue-specific cofactor partner determinants unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,9,10,13,18,20,23,24,27,31,34,35]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,3,7,9,12,14,16]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[3,7,9,15]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[1,3,16]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[30]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,6,28]}],"pathway":[{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[0,5,10,13,17,19]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,12,20,23,24]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[11,30]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[23,36]}],"complexes":["NPAS2:BMAL1 heterodimer","ARNTL2:NPAS2 heterodimer"],"partners":["BMAL1","ARNTL2","CRY1","CRY2","RARA","RXRA","SIRT1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q99743","full_name":"Neuronal PAS domain-containing protein 2","aliases":["Basic-helix-loop-helix-PAS protein MOP4","Class E basic helix-loop-helix protein 9","bHLHe9","Member of PAS protein 4","PAS domain-containing protein 4"],"length_aa":824,"mass_kda":91.8,"function":"Transcriptional activator 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. The NPAS2-BMAL1 heterodimer positively regulates the expression of MAOA, F7 and LDHA and modulates the circadian rhythm of daytime contrast sensitivity by regulating the rhythmic expression of adenylate cyclase type 1 (ADCY1) in the retina. NPAS2 plays an important role in sleep homeostasis and in maintaining circadian behaviors in normal light/dark and feeding conditions and in the effective synchronization of feeding behavior with scheduled food availability. Regulates the gene transcription of key metabolic pathways in the liver and is involved in DNA damage response by regulating several cell cycle and DNA repair genes. Controls the circadian rhythm of NR0B2 expression by binding rhythmically to its promoter (By similarity). Mediates the diurnal variation in the expression of GABARA1 receptor in the brain and contributes to the regulation of anxiety-like behaviors and GABAergic neurotransmission in the ventral striatum (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q99743/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NPAS2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NPAS2","total_profiled":1310},"omim":[{"mim_id":"612975","title":"SHORT SLEEP, FAMILIAL NATURAL, 1; FNSS1","url":"https://www.omim.org/entry/612975"},{"mim_id":"606200","title":"BASIC HELIX-LOOP-HELIX FAMILY, MEMBER E41; BHLHE41","url":"https://www.omim.org/entry/606200"},{"mim_id":"605339","title":"FMR1 AUTOSOMAL HOMOLOG 2; FXR2","url":"https://www.omim.org/entry/605339"},{"mim_id":"605327","title":"NUCLEAR FACTOR, INTERLEUKIN 3-REGULATED; NFIL3","url":"https://www.omim.org/entry/605327"},{"mim_id":"604256","title":"BASIC HELIX-LOOP-HELIX FAMILY, MEMBER E40; BHLHE40","url":"https://www.omim.org/entry/604256"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NPAS2"},"hgnc":{"alias_symbol":["MOP4","PASD4","bHLHe9"],"prev_symbol":[]},"alphafold":{"accession":"Q99743","domains":[{"cath_id":"4.10.280.10","chopping":"1-67","consensus_level":"medium","plddt":86.8472,"start":1,"end":67},{"cath_id":"3.30.450.20","chopping":"94-199_222-236","consensus_level":"high","plddt":85.6584,"start":94,"end":236},{"cath_id":"3.30.450.20","chopping":"249-364","consensus_level":"high","plddt":95.433,"start":249,"end":364}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99743","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q99743-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q99743-F1-predicted_aligned_error_v6.png","plddt_mean":60.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NPAS2","jax_strain_url":"https://www.jax.org/strain/search?query=NPAS2"},"sequence":{"accession":"Q99743","fasta_url":"https://rest.uniprot.org/uniprotkb/Q99743.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q99743/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99743"}},"corpus_meta":[{"pmid":"11441146","id":"PMC_11441146","title":"Regulation 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\"Conditional induction cell line, representational difference analysis, DNA microarrays, Northern blotting\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional expression system with multiple orthogonal readouts, replicated by subsequent studies\",\n      \"pmids\": [\"11441147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The DNA-binding activity of NPAS2:BMAL1 heterodimers is regulated by the redox state of NAD cofactors: reduced forms NAD(H) and NADP(H) strongly enhance DNA binding, while oxidized forms inhibit it, demonstrated in a purified reconstituted system.\",\n      \"method\": \"Purified protein DNA-binding assay (electrophoretic mobility shift / in vitro reconstitution)\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified reconstituted system, replicated by subsequent in vitro work\",\n      \"pmids\": [\"11441146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Nuclear receptors RARα and RXRα physically interact with NPAS2 (MOP4) and negatively regulate NPAS2/BMAL1-mediated transcriptional activation of clock genes in vascular cells; retinoic acid can phase-shift Per2 mRNA rhythmicity.\",\n      \"method\": \"Co-immunoprecipitation, reporter gene assays, in vivo and in vitro phase-shifting experiments\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction shown and functional consequence demonstrated, single lab\",\n      \"pmids\": [\"11439184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Both PAS-A and PAS-B domains of NPAS2 bind heme as a prosthetic group; heme-loaded (holo) NPAS2:BMAL1 heterodimers lose DNA-binding activity upon exposure to low micromolar carbon monoxide, which drives formation of inactive BMAL1 homodimers at the expense of NPAS2:BMAL1 heterodimers; apo-NPAS2 (heme-free) is insensitive to CO.\",\n      \"method\": \"In vitro heme-binding assays, DNA-binding assays with CO titration, reconstituted purified protein system\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified reconstituted system with multiple orthogonal methods and mechanistic controls (apo vs holo)\",\n      \"pmids\": [\"12446832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"NPAS2 is a bHLH-PAS transcription factor expressed in multiple regions of the vertebrate brain; targeted disruption producing an NPAS2-lacZ fusion (lacking the bHLH domain) causes deficits in long-term memory in cued and contextual fear tasks, establishing a functional role in memory acquisition.\",\n      \"method\": \"Targeted gene disruption (lacZ knock-in), behavioral testing (fear conditioning)\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic loss-of-function with specific behavioral phenotype, McKnight lab foundational paper\",\n      \"pmids\": [\"10864874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NPAS2-deficient mice show altered locomotor activity, disrupted sleep patterns, and impaired adaptability to food-restricted entrainment, demonstrating that NPAS2 is required for normal circadian behavioral outputs and food-entrainable oscillator function.\",\n      \"method\": \"NPAS2 knockout mouse model, locomotor activity monitoring, polysomnography, food restriction paradigm\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple specific behavioral readouts, replicates forebrain clock function\",\n      \"pmids\": [\"12843397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CRY1 and CRY2 stabilize unphosphorylated forms of CLOCK/NPAS2 and BMAL1 and promote their nuclear accumulation, but inhibit their transcriptional activity without affecting NPAS2/BMAL1 complex formation or DNA binding; this establishes CRY-mediated post-translational regulation of the NPAS2/BMAL1 complex.\",\n      \"method\": \"Ectopic co-expression, immunofluorescence localization, reporter assays, analysis of Cry double-KO mouse tissues\",\n      \"journal\": \"Cell Cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (co-expression, localization, reporter, KO tissue), single lab\",\n      \"pmids\": [\"16628007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NPAS2 spectroscopic characterization shows that the bHLH domain assists stable heme binding to the PAS-A domain; the heme-bound bHLH-PAS-A domain dimerizes in solution and binds specifically to E-box DNA sequences only in the presence of heme, as measured by quartz-crystal microbalance.\",\n      \"method\": \"Optical absorption spectroscopy, resonance Raman spectroscopy, heme-binding kinetics, quartz-crystal microbalance DNA-binding assay\",\n      \"journal\": \"The FEBS Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple biophysical methods on purified domain, direct structure-function link established, single lab\",\n      \"pmids\": [\"16704425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NPAS2 plays a role in non-rapid eye movement sleep homeostasis: Npas2-/- mice show reduced EEG spindle activity during NREMS and altered delta frequency activity; the wake-dependent increase in cortical Per2 expression is attenuated in Npas2-/- mice, placing NPAS2 upstream of Per2 induction by sleep deprivation.\",\n      \"method\": \"Npas2 knockout mice, EEG recording, sleep deprivation, cortical gene expression analysis\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with quantitative EEG and molecular readouts, McKnight lab\",\n      \"pmids\": [\"16636276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Mutation of the heme axial ligand residues His119 or His171 in the PAS-A domain of NPAS2 markedly reduces transcriptional activity of the mouse Per1 promoter and impairs NPAS2:BMAL1 heterodimer formation and E-box DNA binding, establishing these residues as essential for heme-dependent transcriptional control.\",\n      \"method\": \"Site-directed mutagenesis, reporter gene assay (NIH3T3 cells), gel-shift/EMSA\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with functional reporter and DNA-binding assays, directly links heme coordination to transcriptional activity\",\n      \"pmids\": [\"18230344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CLOCK and NPAS2 have overlapping roles as transcriptional activators in peripheral (liver) circadian oscillators: FVII mRNA rhythmicity is abolished only in Clock-/-;Npas2-/- double-knockout mice, not in single knockouts; reporter assays confirm both NPAS2:BMAL1 and CLOCK:BMAL1 transactivate the FVII promoter via E-boxes, and this activity is repressed by PER2 and CRY1.\",\n      \"method\": \"Clock/Npas2 single and double knockout mice, reporter gene assays, E-box mutagenesis\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic epistasis with double KO, reporter assays with E-box mutagenesis, multiple models\",\n      \"pmids\": [\"18316400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RNAi-mediated depletion of NPAS2 causes failure of expected cell cycle delay after mutagen treatment and impairs DNA repair capacity (comet assay), and represses expression of multiple cell cycle and DNA repair genes, implicating NPAS2 as a regulator of DNA damage response pathways.\",\n      \"method\": \"RNA interference, cell cycle analysis, comet assay, PCR expression array\",\n      \"journal\": \"Molecular Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with multiple functional readouts (cell cycle, DNA repair, gene expression), single lab\",\n      \"pmids\": [\"18819933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Genome-wide ChIP-on-chip analysis identified 16 direct transcriptional target genes bound by NPAS2 in MCF-7 cells, including cancer-related genes CDC25A, CDKN2AIP, CX3CL1, ELF4, and others containing NPAS2 binding regions.\",\n      \"method\": \"ChIP-on-chip (chromatin immunoprecipitation coupled to microarray), real-time PCR validation\",\n      \"journal\": \"Cancer Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP with PCR validation of targets, single lab\",\n      \"pmids\": [\"19457610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NPAS2 gene expression is directly regulated by the nuclear receptors RORα and REV-ERBα through functional RORE elements in the NPAS2 promoter, coordinating NPAS2 expression with BMAL1 as the positive arm of the circadian feedback loop.\",\n      \"method\": \"ChIP/microarray screen for RORα and REV-ERBα occupancy, RORE mutagenesis, reporter assays, siRNA knockdown\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP occupancy, promoter mutagenesis, and functional knockdown with multiple orthogonal methods, single lab\",\n      \"pmids\": [\"20817722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sleep deprivation decreases DNA binding of NPAS2 and BMAL1 to the Per2 promoter in mouse cerebral cortex (by ChIP), demonstrating that sleep-wake history directly modulates NPAS2 chromatin occupancy and thereby alters Per2 expression.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), qPCR, time-of-day fractionation\",\n      \"journal\": \"PLOS ONE\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ChIP measurement in vivo, single lab with multiple time points\",\n      \"pmids\": [\"22039518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The bHLH domain shifts the heme axial coordination in the PAS-A domain of NPAS2 from a Cys170/His119 equilibrium to a predominant His119/His171 bis-histidyl coordination, demonstrating interdomain regulation of heme coordination structure relevant to signal transduction.\",\n      \"method\": \"Resonance Raman spectroscopy, site-directed mutagenesis of Cys170, His119, His171 in bHLH-PAS-A domain\",\n      \"journal\": \"Journal of Inorganic Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with resonance Raman spectroscopy on purified domain, clear structure-function result, single lab\",\n      \"pmids\": [\"22245004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The NAD(P)H interaction site of NPAS2 maps to the N-terminal 61 residues of the bHLH domain; this minimal fragment forms a heterodimer with BMAL1 and supports NAD(P)H-enhanced DNA binding; NAD(P)+ does not inhibit NPAS2 DNA binding in this purified system, suggesting enhancement by reduced cofactor is the primary regulatory mechanism.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA) with truncation mutants, purified recombinant proteins\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution with defined truncations, single lab, single method\",\n      \"pmids\": [\"23831463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Circadian transcription of the Npas2 gene is controlled cell-autonomously by RORα binding to a specific RORE in the Npas2 upstream promoter; dominant-negative RORα, RORα siRNA, or RORα-mutant (sg/sg) fibroblasts all dampen Npas2 transcriptional oscillation.\",\n      \"method\": \"Luciferase reporter with RORE mutagenesis, dominant negative construct, siRNA, RORα-mutant mouse embryonic fibroblasts\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — promoter mutagenesis and genetic model converge on same conclusion, single lab\",\n      \"pmids\": [\"24196956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NPAS2 directly transcriptionally regulates the Drd3 dopamine receptor gene in the nucleus accumbens (NAc); NPAS2 expression is restricted to Drd1-expressing neurons in the NAc; NPAS2 knockdown in the NAc disrupts Drd3 diurnal rhythm and reduces cocaine conditioned place preference, while CLOCK knockdown in NAc has no effect, revealing a distinct non-redundant role for NPAS2.\",\n      \"method\": \"AAV-shRNA knockdown in NAc, ChIP-seq, cell sorting qRT-PCR, conditioned place preference assay\",\n      \"journal\": \"Biological Psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — region-specific knockdown, ChIP-seq for direct binding, cell-type characterization, behavioral output with CLOCK comparison\",\n      \"pmids\": [\"25444159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NPAS2 compensates for loss of CLOCK in peripheral circadian oscillators: in CLOCK-deficient fibroblasts, Npas2 knockdown leads to arrhythmicity, demonstrating that NPAS2 maintains autonomous circadian rhythms in peripheral cells (not only in SCN neurons).\",\n      \"method\": \"Single-cell bioluminescence imaging (PER2::LUC), Npas2 siRNA knockdown in CLOCK-deficient fibroblasts\",\n      \"journal\": \"PLoS Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live single-cell imaging with genetic knockdown, clean epistasis demonstrating functional redundancy\",\n      \"pmids\": [\"26895328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NPAS2 promotes HCC cell survival by transcriptionally upregulating CDC25A phosphatase through E-box elements in the CDC25A promoter (with BMAL1 as obligate heterodimer), leading to dephosphorylation of CDK2/4/6 (promoting proliferation) and Bcl-2 (inhibiting apoptosis).\",\n      \"method\": \"ChIP, luciferase reporter with E-box mutagenesis, Co-IP (NPAS2-BMAL1 interaction), in vitro and in vivo tumor models\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct ChIP binding, E-box mutagenesis, Co-IP for complex, downstream phosphorylation targets identified, in vivo validation\",\n      \"pmids\": [\"28333141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NPAS2 is identified as a direct transcriptional target of Gabra genes in striatum; Npas2 null mutant mice show reduced sensitivity to the GABA-A receptor positive allosteric modulator diazepam, and NAc-specific Npas2 knockdown reduces Gabra1 expression, linking NPAS2 to GABAergic neurotransmission.\",\n      \"method\": \"Global Npas2 knockout, NAc-specific AAV-shRNA knockdown, elevated plus maze/light-dark/open field behavioral assays, qPCR\",\n      \"journal\": \"Frontiers in Molecular Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — region-specific knockdown with molecular and behavioral readouts, single lab\",\n      \"pmids\": [\"29163035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CLOCK and NPAS2 both bind the Aanat promoter E-box in situ (by ChIP) in chicken photoreceptors; knockdown of CLOCK reduces circadian expression of Npas2, Per2, and Aanat, while NPAS2 knockdown dampens Aanat rhythm without affecting other clock genes, demonstrating overlapping but hierarchically distinct roles.\",\n      \"method\": \"Gene-specific miRNA knockdown vectors, ChIP, real-time PCR in photoreceptor-enriched cultures\",\n      \"journal\": \"Journal of Neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in situ ChIP and targeted knockdown, ortholog in chicken (consistent with mammalian function)\",\n      \"pmids\": [\"20345751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NPAS2 directly transcriptionally activates HIF-1α, which mediates upregulation of glycolytic genes (GLUT1, HK2, GPI, ALDOA, ENO2, PKM2, MCT4) and downregulation of PGC-1α (mitochondrial biogenesis), promoting Warburg-type glucose metabolism reprogramming in HCC cells.\",\n      \"method\": \"NPAS2 overexpression/knockdown, ChIP, luciferase reporter, in vitro and in vivo metabolic assays\",\n      \"journal\": \"Cancer Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct binding, reporter assays, in vitro/in vivo metabolic readouts, single lab\",\n      \"pmids\": [\"31765736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NPAS2 contributes to liver fibrosis by directly transcriptionally activating Hes1 (a Notch signaling transcription factor) in hepatic stellate cells, promoting their activation; NPAS2 is upregulated in HSCs after fibrogenic injury.\",\n      \"method\": \"ChIP, luciferase reporter, NPAS2 overexpression/knockdown in HSCs, mouse fibrosis model\",\n      \"journal\": \"Molecular Therapy: Nucleic Acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ChIP and reporter assays with in vivo fibrosis model, single lab\",\n      \"pmids\": [\"31778954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NPAS2 expression is restricted to Drd1-expressing D1R-MSNs in the NAc; NPAS2 negatively regulates excitatory synaptic transmission onto D1R-MSNs specifically; cell-type-specific Npas2 knockdown in D1R-MSNs (but not D2R-MSNs) reduces cocaine conditioned place preference and blocks cocaine-induced synaptic potentiation.\",\n      \"method\": \"Cre-inducible shRNA virus, Drd1a-tdTomato mouse line, whole-cell electrophysiology, conditioned place preference\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific genetic manipulation with electrophysiology and behavior, replicated in multiple mouse models\",\n      \"pmids\": [\"30962277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The ARNTL2/NPAS2 heterodimer is a weaker activator of PER3 and DBP than the ARNTL/NPAS2 heterodimer in HEK293 cells; DEC2 blocks the transcriptional effect of the ARNTL2/NPAS2 dimer; TNF induces ARNTL2 nuclear localization and upregulates both ARNTL2 and NPAS2 via NF-κB.\",\n      \"method\": \"Transfection in HEK293 cells, RT-qPCR, immunofluorescence, IKK-2 inhibitor (NF-κB pathway)\",\n      \"journal\": \"Journal of Circadian Rhythms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter/expression assays with pathway inhibitor, single lab\",\n      \"pmids\": [\"30210560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NPAS2 transcriptionally regulates diurnal expression of hepatic CYP1A2 by binding to an E-box-like element at -416 bp in the Cyp1a2 promoter; Npas2-/- mice show decreased CYP1A2 mRNA, protein, and enzymatic activity with abolished rhythmicity.\",\n      \"method\": \"Npas2 knockout mice, luciferase reporter assays, ChIP-seq, probe substrate pharmacokinetics in vivo\",\n      \"journal\": \"Biochemical Pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP-seq for direct binding, E-box reporter, KO mouse with both molecular and enzymatic readouts, single lab\",\n      \"pmids\": [\"36379250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NPAS2 and SIRT1 physically interact in the nucleus accumbens (by Co-IP); both show diurnal expression in NAc that is altered by cocaine; cross-analysis of NPAS2 and SIRT1 ChIP-seq identifies shared reward-relevant gene targets; NAc-specific Npas2 knockdown attenuates SIRT1-mediated increases in cocaine preference.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, NAc-specific AAV knockdown, cocaine conditioned place preference\",\n      \"journal\": \"European Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for physical interaction, ChIP-seq for shared targets, in vivo behavioral epistasis, single lab\",\n      \"pmids\": [\"35001440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NPAS2 interacts with CRY2 (by Co-IP in cardiomyocytes) and directly acts on the CX3CL1 promoter as a transcriptional activator; overexpression of NPAS2 ameliorates myocardial ischemia/reperfusion injury via CX3CL1-AKT/mTOR regulation of autophagy.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter (CX3CL1 promoter), adenoviral overexpression, rat I/R model\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for CRY2 interaction, reporter for CX3CL1 activation, in vivo rescue with pathway inhibition, single lab\",\n      \"pmids\": [\"34460437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NPAS2 enhances the stability of H2AX mRNA by binding to it, thereby upregulating the DNA damage repair pathway (specifically homology-directed repair); depletion of NPAS2 reduces γH2AX accumulation and sensitizes lung adenocarcinoma cells to cisplatin.\",\n      \"method\": \"NPAS2 knockdown, mRNA sequencing, γH2AX immunostaining, HDR assay, in vivo cisplatin treatment\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with molecular (mRNA stability, γH2AX) and functional (HDR) readouts, in vivo confirmation, single lab\",\n      \"pmids\": [\"38291048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"p53 transcriptionally activates NPAS2 in alveolar type II epithelial cells; NPAS2 in turn promotes epithelial-mesenchymal transition by positively regulating HES1 expression; NPAS2 overexpression weakens the effects of TP53 knockdown on EMT.\",\n      \"method\": \"Reporter assays, siRNA knockdown of TP53/NPAS2, overexpression, mouse bleomycin fibrosis model\",\n      \"journal\": \"Cellular Signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis between p53, NPAS2, and HES1 with in vivo model, single lab\",\n      \"pmids\": [\"37406788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Npas2 expression in bone marrow stromal cells (BMSC) is induced by rough-surface Ti implants via α2-adrenergic receptor/cAMP/CREB signaling; Npas2 functional knockout mice show impaired osseointegration of rough-surface implants with abnormal collagen architecture, establishing a neuroskeletal role for NPAS2.\",\n      \"method\": \"Npas2 KO mouse implant model, implant push-out test, high-throughput chemical screen with Npas2-reporter, α2-adrenergic receptor expression analysis\",\n      \"journal\": \"Biomaterials\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO model with mechanical and histological readouts, upstream pathway identified by chemical screen, single lab\",\n      \"pmids\": [\"30428407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In vascular smooth muscle cells (VSMCs), NPAS2 transcriptionally represses LPCAT3 (a phospholipid remodeling enzyme); NPAS2 depletion elevates PC-PUFA2S (phosphatidylcholines with two polyunsaturated fatty acyl chains), promoting ferroptosis-induced VSMC phenotypic switching and accelerating ascending thoracic aortic aneurysm; VSMC-specific NPAS2 KO mice exhibit aggravated ATAA.\",\n      \"method\": \"VSMC-specific NPAS2 knockout mice, ChIP/reporter assays (LPCAT3 promoter), lipidomics (PC-PUFA2S), ferroptosis assays, PDGF-BB-treated HASMCs\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — preprint, VSMC-specific KO with lipidomics and ferroptosis readouts, direct transcriptional repression of LPCAT3 shown, single lab not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.09.23.677952\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NPAS2 in medial prefrontal cortex (mPFC) transcriptionally activates POU2F2, a transcriptional repressor that downregulates tyrosine hydroxylase (TH) expression, reducing dopamine synthesis in mPFC TH+ neurons during nap hours; mPFC-specific NPAS2 manipulation alters nap behavior in mice.\",\n      \"method\": \"Region-specific NPAS2 manipulation (mPFC), ChIP/reporter for POU2F2-TH pathway, electrophysiology of TH+ neurons, behavioral nap analysis\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway defined through direct molecular steps (NPAS2→POU2F2→TH), region-specific manipulation, electrophysiology, multiple orthogonal methods\",\n      \"pmids\": [\"41839866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In hypertrophic scar fibroblasts, NPAS2 binds to an E-like-box in the CDC25A promoter to transcriptionally activate CDC25A, promoting fibroblast proliferation and migration; in vivo knockdown of NPAS2 in rat tail wounds inhibits hypertrophic scar formation.\",\n      \"method\": \"Dual-luciferase reporter assay, ChIP, gain/loss-of-function in HDFs and HTS-Fs, in vivo rat wound model with AAV knockdown\",\n      \"journal\": \"Journal of Cellular and Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ChIP and E-box reporter, in vivo wound model, single lab\",\n      \"pmids\": [\"40548841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FTO (m6A demethylase) reduces m6A modification of Npas2 mRNA through a Prrc2a-dependent mechanism, decreasing Npas2 mRNA stability; Npas2 upregulates HIF-1α signaling to drive M1 macrophage glycolysis and inflammation in diabetic nephropathy.\",\n      \"method\": \"MeRIP-seq, transcriptome analysis, Fto loss/gain-of-function, Prrc2a dependence, db/db mouse model\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epitranscriptomic mechanism (MeRIP-seq), multiple functional readouts, single lab\",\n      \"pmids\": [\"39831513\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NPAS2 is a bHLH-PAS transcription factor that forms obligate heterodimers with BMAL1 (and ARNTL2) to bind E-box elements and drive circadian gene expression in the forebrain and peripheral tissues; its DNA-binding activity is positively regulated by reduced NAD(P)H cofactors and by heme bound to its PAS-A and PAS-B domains, with carbon monoxide inhibiting holo-NPAS2 by promoting inactive BMAL1 homodimers; it is post-translationally regulated by CRY1/2 (stabilizing unphosphorylated nuclear forms while inhibiting transcriptional activity) and transcriptionally regulated by RORα and REV-ERBα via RORE elements; direct transcriptional targets include Per1/Per2/Cry1, CDC25A, Drd3, CX3CL1, HIF-1α, HES1, Gabra genes, CYP1A2, LPCAT3, POU2F2/TH, and others, linking NPAS2 to sleep homeostasis, memory, reward/addiction, DNA damage response, metabolic reprogramming, and tissue fibrosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NPAS2 is a bHLH-PAS transcription factor that forms an obligate heterodimer with BMAL1 to bind E-box DNA elements and drive the positive arm of the circadian transcriptional feedback loop, activating Per1, Per2, and Cry1 while repressing BMAL1 [#0]. Its own expression oscillates under control of the nuclear receptors RORα and REV-ERBα acting through RORE elements in the Npas2 promoter [#13, #17]. The heterodimer's DNA-binding activity is gated by cellular redox and gas-sensing inputs: reduced NAD(P)H cofactors strongly enhance binding through a site in the N-terminal bHLH domain [#1, #16], while both PAS-A and PAS-B domains bind heme as a prosthetic group, and heme-loaded NPAS2:BMAL1 loses DNA binding upon carbon monoxide exposure, which favors inactive BMAL1 homodimers [#3]; the bHLH domain assists stable heme binding and tunes the PAS-A axial coordination, and mutation of the His119/His171 axial ligands cripples heterodimer formation, E-box binding, and transactivation [#7, #9, #15]. CRY1/2 post-translationally regulate the complex by stabilizing unphosphorylated nuclear forms while inhibiting transcriptional activity without disrupting DNA binding [#6]. NPAS2 functions partially redundantly with CLOCK in both forebrain and peripheral oscillators—double knockout is required to abolish rhythmic peripheral targets, and NPAS2 sustains autonomous rhythms in CLOCK-deficient fibroblasts [#10, #19]—yet it also has non-redundant roles, particularly in brain reward circuitry where it acts in D1R-expressing accumbens neurons to regulate Drd3 and excitatory transmission and to drive cocaine-conditioned behavior [#18, #25]. At the organismal level NPAS2 governs long-term memory, sleep homeostasis, and food-entrainable behavior [#4, #5, #8]. Beyond its core clock role, NPAS2 acts as a direct transcriptional regulator in diverse disease contexts, activating CDC25A, HIF-1α, HES1, and CX3CL1 to promote proliferation, glycolytic metabolic reprogramming, fibrosis, and cell survival [#20, #23, #24, #31], and it can stabilize H2AX mRNA to support DNA damage repair [#30].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established NPAS2 as a brain-expressed bHLH-PAS transcription factor with a defined physiological role, answering whether the gene has a non-redundant function in vivo.\",\n      \"evidence\": \"Targeted lacZ knock-in disrupting the bHLH domain with fear-conditioning behavior in mice\",\n      \"pmids\": [\"10864874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify molecular partners or target genes\", \"Mechanism linking NPAS2 to memory not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the core molecular activity of NPAS2 as an obligate BMAL1 heterodimer that binds E-boxes to activate clock genes, and showed its DNA binding is gated by NAD cofactor redox state—linking transcription to metabolic status.\",\n      \"evidence\": \"Conditional co-induction cell line with target identification; purified reconstituted DNA-binding assays with NAD(P)H/NAD(P)+ titration\",\n      \"pmids\": [\"11441147\", \"11441146\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological source of redox signal in vivo unresolved\", \"Structural basis of cofactor enhancement not defined at this stage\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified nuclear receptor crosstalk by showing RARα/RXRα physically bind NPAS2 and repress its activity, connecting retinoid signaling to clock phase.\",\n      \"evidence\": \"Co-IP, reporter assays, and phase-shifting experiments in vascular cells\",\n      \"pmids\": [\"11439184\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Physiological relevance to central clock not established\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Revealed NPAS2 as a heme- and gas-sensing transcription factor, answering how environmental/metabolic gases could modulate the clock: holo-NPAS2 loses DNA binding under CO via BMAL1 homodimer formation.\",\n      \"evidence\": \"In vitro heme-binding and CO-titration DNA-binding assays comparing apo vs holo protein\",\n      \"pmids\": [\"12446832\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo source and concentration of CO acting on NPAS2 unclear\", \"Whether heme occupancy is dynamic in cells not addressed\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated NPAS2 is required for circadian behavioral outputs and food-entrainable oscillation, establishing it as a functional forebrain clock component.\",\n      \"evidence\": \"Npas2 knockout mice with locomotor monitoring, polysomnography, and food-restriction paradigm\",\n      \"pmids\": [\"12843397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate forebrain from peripheral contributions\", \"Redundancy with CLOCK not yet tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved the structural basis of heme sensing and defined CRY-mediated post-translational control, showing the bHLH domain assists heme binding and that CRY1/2 stabilize the complex while repressing its activity.\",\n      \"evidence\": \"Resonance Raman/optical spectroscopy and QCM DNA binding on purified domains; co-expression, localization, reporter, and Cry double-KO tissue analysis\",\n      \"pmids\": [\"16704425\", \"16628007\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CRY regulation shown in single lab\", \"Coupling between heme state and CRY regulation not integrated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed NPAS2 upstream of activity-dependent Per2 induction in the cortex, mechanistically linking it to NREM sleep homeostasis.\",\n      \"evidence\": \"EEG recording and sleep deprivation in Npas2 knockout mice with cortical gene expression\",\n      \"pmids\": [\"16636276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct chromatin mechanism not measured here\", \"Cell types responsible not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Pinpointed heme axial ligand residues His119/His171 as essential for heterodimer formation, E-box binding, and transactivation, directly tying heme coordination to transcriptional output.\",\n      \"evidence\": \"Site-directed mutagenesis with reporter and EMSA assays\",\n      \"pmids\": [\"18230344\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ligand identity changes dynamically in vivo not shown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established functional redundancy with CLOCK in peripheral oscillators via genetic epistasis, answering whether NPAS2 acts only centrally.\",\n      \"evidence\": \"Clock/Npas2 single and double knockout mice with reporter assays and E-box mutagenesis on the FVII promoter\",\n      \"pmids\": [\"18316400\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific division of labor between CLOCK and NPAS2 not fully mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Extended NPAS2 function beyond timekeeping to the DNA damage response, showing its loss impairs cell cycle delay and repair after mutagen exposure.\",\n      \"evidence\": \"RNAi depletion with cell cycle analysis, comet assay, and expression arrays\",\n      \"pmids\": [\"18819933\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct target genes not defined here\", \"Mechanism of repair regulation unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Provided a genome-wide map of direct NPAS2 targets, broadening its regulon to cancer-relevant genes including CDC25A and CX3CL1.\",\n      \"evidence\": \"ChIP-on-chip in MCF-7 cells with qPCR validation\",\n      \"pmids\": [\"19457610\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequences of most targets not tested\", \"Single cell line\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined how NPAS2 is wired into the feedback loop, showing RORα/REV-ERBα drive its rhythmic transcription through RORE elements, and confirmed conserved overlapping/distinct roles with CLOCK at the Aanat promoter.\",\n      \"evidence\": \"ChIP occupancy, RORE mutagenesis, reporter, siRNA; targeted miRNA knockdown and ChIP in chicken photoreceptors\",\n      \"pmids\": [\"20817722\", \"20345751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of each regulator to oscillation amplitude not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected behavioral state to chromatin, showing sleep deprivation reduces NPAS2/BMAL1 occupancy at the Per2 promoter in vivo, and mapped the NAD(P)H interaction to the N-terminal bHLH region with reduced cofactor as the primary enhancer.\",\n      \"evidence\": \"In vivo ChIP/qPCR across time of day; EMSA with bHLH truncation mutants\",\n      \"pmids\": [\"22039518\", \"23831463\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signal upstream of occupancy changes not identified\", \"NAD(P)H truncation work is single-method/single-lab\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Refined the heme-sensing model by showing the bHLH domain shifts PAS-A axial coordination toward a bis-histidyl His119/His171 state, providing a structural mechanism for interdomain signal transduction.\",\n      \"evidence\": \"Resonance Raman spectroscopy with mutagenesis of Cys170/His119/His171 on purified bHLH-PAS-A domain\",\n      \"pmids\": [\"22245004\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of coordination switch in full-length protein in cells not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated NPAS2 can sustain autonomous peripheral rhythms independently, answering whether its redundancy with CLOCK extends to cell-autonomous oscillation.\",\n      \"evidence\": \"Single-cell PER2::LUC bioluminescence imaging with Npas2 knockdown in CLOCK-deficient fibroblasts\",\n      \"pmids\": [\"26895328\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why SCN versus peripheral tissues differ in CLOCK/NPAS2 dependence not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified non-redundant NPAS2 functions in the reward system and in cancer cell survival, distinguishing it mechanistically from CLOCK in the accumbens and showing CDC25A activation drives proliferation/anti-apoptosis in HCC.\",\n      \"evidence\": \"NAc AAV-shRNA knockdown, ChIP-seq, conditioned place preference with CLOCK comparison; ChIP, E-box reporter, Co-IP, and tumor models for CDC25A\",\n      \"pmids\": [\"25444159\", \"28333141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis for CLOCK/NPAS2 functional divergence in NAc unknown\", \"Whether heme/redox gating operates in these non-clock contexts untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Expanded NPAS2's reach to GABAergic neurotransmission and characterized weaker ARNTL2/NPAS2 heterodimer activity plus NF-κB-driven induction, broadening its dimerization and regulatory inputs.\",\n      \"evidence\": \"Npas2 KO and NAc knockdown with behavioral assays and qPCR; HEK293 transfection, RT-qPCR, immunofluorescence, IKK-2 inhibition\",\n      \"pmids\": [\"29163035\", \"30210560\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological role of ARNTL2/NPAS2 dimer in vivo unclear\", \"Single labs\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Cemented cell-type-specific accumbens function and broadened the disease regulon, showing NPAS2 acts in D1R-MSNs to control excitatory transmission and cocaine plasticity, and activates HIF-1α and HES1 to drive glycolytic reprogramming and fibrosis.\",\n      \"evidence\": \"Cre-inducible shRNA with electrophysiology and CPP; ChIP/reporter and in vivo models for HIF-1α (HCC) and Hes1 (hepatic stellate cells)\",\n      \"pmids\": [\"30962277\", \"31765736\", \"31778954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NPAS2 selects context-specific targets not defined\", \"Whether these roles depend on BMAL1 heterodimerization not uniformly tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated cardioprotective NPAS2 activity through CX3CL1 transcriptional activation and autophagy regulation, with a physical CRY2 interaction in cardiomyocytes.\",\n      \"evidence\": \"Co-IP, CX3CL1 reporter, adenoviral overexpression in a rat ischemia/reperfusion model\",\n      \"pmids\": [\"34460437\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Endogenous (non-overexpression) contribution not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked NPAS2 to xenobiotic metabolism rhythmicity, showing it directly drives diurnal hepatic CYP1A2 expression and enzymatic activity.\",\n      \"evidence\": \"Npas2 KO mice, ChIP-seq, E-box reporter, and probe-substrate pharmacokinetics\",\n      \"pmids\": [\"36379250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality across other CYP genes not assessed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified SIRT1 as a physical and functional NPAS2 partner in the accumbens, integrating a deacetylase into reward-relevant transcriptional control.\",\n      \"evidence\": \"Co-IP, overlapping ChIP-seq target analysis, NAc knockdown, and cocaine CPP epistasis\",\n      \"pmids\": [\"35001440\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SIRT1 deacetylates NPAS2 directly not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Uncovered a non-transcriptional NPAS2 activity—mRNA binding/stabilization of H2AX—mechanistically supporting homology-directed repair and chemoresistance.\",\n      \"evidence\": \"NPAS2 knockdown, mRNA-seq, γH2AX immunostaining, HDR assay, and in vivo cisplatin treatment in lung adenocarcinoma\",\n      \"pmids\": [\"38291048\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RNA-binding domain/specificity not mapped\", \"Relationship to its DNA-binding clock role unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended NPAS2 as a transcriptional repressor of lipid remodeling (LPCAT3) controlling ferroptosis and vascular disease, and a regulator of macrophage glycolysis via FTO/m6A-controlled stability feeding into HIF-1α.\",\n      \"evidence\": \"VSMC-specific KO mice with ChIP/reporter, lipidomics, ferroptosis assays (preprint); MeRIP-seq and db/db model for FTO/Prrc2a regulation\",\n      \"pmids\": [\"bio_10.1101_2025.09.23.677952\", \"39831513\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"LPCAT3 study is an unreviewed preprint\", \"Whether repression requires BMAL1 heterodimer not addressed\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined a circuit-level NPAS2 pathway in mPFC—NPAS2→POU2F2→TH—linking the clock factor to dopamine synthesis control and nap behavior.\",\n      \"evidence\": \"Region-specific mPFC manipulation, ChIP/reporter, electrophysiology of TH+ neurons, and behavioral nap analysis\",\n      \"pmids\": [\"41839866\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this pathway requires canonical E-box/BMAL1 dimerization not specified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NPAS2 selects between its canonical BMAL1-dependent E-box transcription and context-specific or non-transcriptional activities (e.g., mRNA stabilization, repression) across tissues remains unresolved, and the in vivo role of heme/redox/CO gating in non-clock disease contexts is undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model connecting heme/redox sensing to disease-context targets\", \"RNA-binding versus DNA-binding mode switching unexplained\", \"Tissue-specific cofactor partner determinants unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 9, 10, 13, 18, 20, 23, 24, 27, 31, 34, 35]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 3, 7, 9, 12, 14, 16]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [3, 7, 9, 15]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [1, 3, 16]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 6, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [0, 5, 10, 13, 17, 19]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 12, 20, 23, 24]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [11, 30]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [23, 36]}\n    ],\n    \"complexes\": [\"NPAS2:BMAL1 heterodimer\", \"ARNTL2:NPAS2 heterodimer\"],\n    \"partners\": [\"BMAL1\", \"ARNTL2\", \"CRY1\", \"CRY2\", \"RARA\", \"RXRA\", \"SIRT1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}