{"gene":"CRY2","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":1999,"finding":"CRY1 and CRY2 are essential components of the mammalian circadian oscillator; mice lacking both proteins display instantaneous and complete loss of free-running circadian rhythmicity, while single knockouts show accelerated (Cry1-/-) or delayed (Cry2-/-) free-running periodicity of locomotor activity.","method":"Genetic knockout (Cry1-/-, Cry2-/-, Cry1-/-Cry2-/- double knockout mice), locomotor activity monitoring","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined phenotypic readout, foundational study replicated broadly","pmids":["10217146"],"is_preprint":false},{"year":2002,"finding":"CRY1 and CRY2 upregulate BMAL1 transcription and negatively autoregulate their own expression via an interlocked feedback loop; BMAL1-CLOCK dimers repress BMAL1, while CRY1, CRY2, and PER2 activate BMAL1 transcription, forming a third positive forward loop.","method":"Transfection/luciferase reporter assays, characterization of mouse Bmal1 promoter genomic structure","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay in cells, single lab","pmids":["11798163"],"is_preprint":false},{"year":2001,"finding":"An intact flavin-binding domain is required for normal CRY2 function in suppressing CLOCK/BMAL1-mediated transcription; mutation of any of the three conserved tryptophan residues in the putative electron transport chain inhibits xCRY2b function, indicating CRY2 depends on electron transport through the conserved tryptophan pathway, unlike CRY1.","method":"Site-directed mutagenesis of conserved tryptophan residues, luciferase reporter suppression assay in Xenopus CRY2b","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 1 — mutagenesis with functional readout, single lab","pmids":["11747820"],"is_preprint":false},{"year":2009,"finding":"Mammalian CRY2 undergoes rhythmic phosphorylation; DYRK1A phosphorylates Ser557 as a priming event for subsequent GSK-3β-mediated phosphorylation of Ser553, which promotes proteasomal degradation of CRY2. DYRK1A kinase activity toward Ser557 shows circadian variation in mouse liver, and knockdown of Dyrk1a causes abnormal CRY2 accumulation and shortened circadian period.","method":"In vitro kinase assay, mutagenesis (S557A/S553A), siRNA knockdown, circadian period analysis in cells, mouse liver fractionation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay + mutagenesis + cellular period phenotype, multiple orthogonal methods","pmids":["20123978"],"is_preprint":false},{"year":2016,"finding":"CRY2 functions as a component of an FBXL3-containing E3 ubiquitin ligase that recruits T58-phosphorylated c-MYC for ubiquitylation and proteasomal degradation; CRY1 cannot substitute for CRY2 in this function.","method":"Co-immunoprecipitation, ubiquitination assays, genetic loss-of-function (CRY2 KO cells), c-MYC stability assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — Co-IP, ubiquitination assay, KO with substrate turnover readout, multiple orthogonal methods in single rigorous paper","pmids":["27840026"],"is_preprint":false},{"year":2015,"finding":"FBXW7 is an E3 ubiquitin ligase that targets CRY2 for proteasomal degradation by binding directly to phosphorylated Thr300 of CRY2; FBXW7 enhances CRY2 ubiquitination and accelerates its turnover.","method":"Co-immunoprecipitation, ubiquitination assay, mutagenesis (Thr300 phosphorylation site), CRY2 turnover/pulse-chase analysis","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ubiquitination assay and mutagenesis in single lab","pmids":["25855785"],"is_preprint":false},{"year":2013,"finding":"CRY1 and CRY2 are both transcriptional repressors of clock-controlled genes in the SCN, but CRY1 is more potent; CRY2 also attenuates the period-lengthening effect of CRY1. Stabilization of either CRY protein via the Fbxl3(Afh) mutation lengthens circadian period in a dose-dependent manner.","method":"Genetic epistasis using Fbxl3(Afh) mutant combined with Cry1-/- and Cry2-/- mice; bioluminescence recordings of SCN slices, wheel-running behavior","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 — clean genetic epistasis with defined circadian period and SCN transcriptional suppression phenotypes","pmids":["23616524"],"is_preprint":false},{"year":2009,"finding":"Mutagenesis of mouse CRY2 identified a region (residues 493–512) in the C-terminal domain responsible for direct physical interaction with PER2; mutation of Arg-501 and Lys-503 abolishes this interaction.","method":"Mammalian two-hybrid assay, co-immunoprecipitation, oligonucleotide-based degenerate PCR mutagenesis","journal":"BMC molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and mutagenesis identifying specific residues, single lab","pmids":["20840750"],"is_preprint":false},{"year":2009,"finding":"Mutagenesis screen identified CRY2 residue G354 as critical for clock protein binding (required for repression by both CRYs), and G351 as specific to a CRY2-unique repression mechanism; overexpression of CRY2G351D abolishes circadian rhythmicity in NIH 3T3 cells.","method":"Random mutagenesis, cell-based screen for CLOCK-BMAL1 repression, protein binding assays, circadian rhythm amplitude measurements","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis screen + functional clock assays, single lab","pmids":["19687303"],"is_preprint":false},{"year":2017,"finding":"CRY1 and CRY2 broadly interact with nuclear receptors and serve as corepressors, binding independently of other core clock factors to many genomic sites enriched for nuclear receptor recognition motifs, contributing to diurnal modulation of drug metabolism.","method":"ChIP-seq, Co-IP, genomic binding analysis in mammalian cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq and Co-IP, single lab with multiple methods","pmids":["28751364"],"is_preprint":false},{"year":2018,"finding":"CRY2 (but not CRY1) specifically interacts with Bclaf1 to stabilize mRNAs encoding cyclin D1 and Tmem176b, regulating circadian patterns of myoblast proliferation and myogenic cell fusion; Cry2-/- mice show impaired muscle regeneration.","method":"Co-immunoprecipitation (Cry2-Bclaf1), Cry2 KO mice, muscle regeneration assays, mRNA stability assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, KO mouse with defined cellular phenotype and post-transcriptional mechanism, single lab","pmids":["29466738"],"is_preprint":false},{"year":2010,"finding":"Cry1/Cry2 double-deficient mice lose circadian rhythmicity of pineal melatonin concentration and fail to suppress melatonin in response to an acute light pulse, demonstrating CRY proteins mediate photic signals from the SCN to the pineal gland.","method":"Cry1/Cry2 double KO mice (C3H background), pineal melatonin measurement by ELISA under LD and DD conditions, acute light-pulse suppression test","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined biochemical and physiological readout","pmids":["20825493"],"is_preprint":false},{"year":2021,"finding":"CRY2 missense mutations D325H and S510L (found in human cancers) suppress P53 target gene expression and accelerate growth of primary mouse fibroblasts expressing high c-MYC; the mutants have divergent effects on circadian rhythms and CRY2–SCFFBXL3 interaction.","method":"Cancer genome atlas mutation analysis, stable expression of CRY2 mutants in primary mouse fibroblasts, P53 target gene expression, circadian period assay, Co-IP with FBXL3","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis, Co-IP, functional cell growth and gene expression assays, single lab","pmids":["34183418"],"is_preprint":false},{"year":2022,"finding":"CRY2 isoform selectivity of the small-molecule modulator SHP656 is determined by the gatekeeper residue W417 in CRY2; X-ray crystal structure of CRY2 complexed with SHP656 shows compound binding is compatible with the intrinsic 'in' and 'further in' orientations of W417, and perturbation of this residue reduces SHP656 efficacy.","method":"X-ray crystallography (CRY2–SHP656 complex), molecular dynamics simulations, cellular circadian period assay, CRY1/CRY2 KO cell selectivity testing","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with mutagenesis validation and functional cellular assay, single rigorous study","pmids":["36161947"],"is_preprint":false},{"year":2023,"finding":"CRY2 represses CLOCK/BMAL1 transcriptional activation via a conserved Cys432-mediated interaction with PER2; mutagenesis of C432 disrupts PER2 association but not BMAL1 binding, abolishing repression of Wnt pathway components and impairing adipocyte differentiation.","method":"Site-directed mutagenesis (C432), co-immunoprecipitation, luciferase reporter assay, adipogenic differentiation assays, CRY2 stabilization with KL001","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 1-2 — mutagenesis identifying specific residue + Co-IP + functional differentiation assay, single lab","pmids":["37724597"],"is_preprint":false},{"year":2019,"finding":"CRY2 inhibits the CLOCK/BMAL1 complex to suppress transcription of P300; silencing CRY2 releases CLOCK/BMAL1 to bind the P300 E-box and drive P300 expression, which then acetylates histone 3 and forms a transcriptional complex with Runx2 to promote osteoblast differentiation.","method":"CRY2 knockdown/overexpression, ChIP assay (CLOCK/BMAL1 at P300 promoter), Co-IP (CRY2-CLOCK/BMAL1), osteoblast differentiation markers","journal":"Molecular therapy. Nucleic acids","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP, ChIP, KD/OE with mechanistic pathway placement, single lab","pmids":["31982773"],"is_preprint":false},{"year":2020,"finding":"CRY2 suppresses trophoblast migration and invasion by inhibiting the c-Myc–BMAL1 pathway; CRY2 overexpression impairs migration/invasion, while CRY2 knockdown restores it. Mechanistically, c-Myc binds the BMAL1 promoter to drive BMAL1 transcription and activate MMP2/9, and CRY2 inhibits this pathway.","method":"CRY2 overexpression/knockdown in HTR-8/SVneo cells, wound healing/transwell assays, luciferase reporter and ChIP assay (c-Myc at BMAL1 promoter), western blot for MMP2/9","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP/ChIP, KD/OE with mechanistic pathway, single lab","pmids":["31536114"],"is_preprint":false},{"year":2019,"finding":"CRISPR/Cas9-generated human CRY2 knockout cells display long-period circadian rhythms, whereas CRY1 KO cells show short-period rhythms, and CRY1/CRY2 double KO cells are arrhythmic, confirming distinct and essential roles for each CRY in human circadian timekeeping.","method":"CRISPR/Cas9 knockout (duplex, exon deletion), bioluminescence circadian rhythm recording in human U-2 OS cells","journal":"Frontiers in physiology","confidence":"High","confidence_rationale":"Tier 2 — clean CRISPR KO with quantitative circadian period readout, consistent with multiple prior animal KO studies","pmids":["31143130"],"is_preprint":false},{"year":2020,"finding":"MALAT1 long non-coding RNA recruits the E3 ubiquitin ligase FBXW7 to promote CRY2 ubiquitin-mediated proteasomal degradation in trophoblasts; MALAT1 downregulation stabilizes CRY2 and impairs trophoblast migration/invasion.","method":"RNA pull-down, Co-IP (FBXW7-CRY2 interaction), CRY2 ubiquitination assay, MALAT1 KD with functional migration/invasion assays","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 — RNA pull-down, Co-IP, ubiquitination assay with functional consequence, single lab","pmids":["32776544"],"is_preprint":false},{"year":2009,"finding":"Cry1 and Cry2 double-deficient mice (C3H strain) lose circadian rhythmicity of pineal melatonin and fail to suppress melatonin after an acute light pulse, indicating CRY genes mediate both circadian and photic regulation of the SCN-pineal axis.","method":"Double KO mice, pineal melatonin ELISA under LD and DD, light-pulse experiment","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with biochemical readout, single paper","pmids":["20825493"],"is_preprint":false},{"year":2023,"finding":"Loss of CRY2 in satellite cells activates the ERK1/2 signaling pathway and the transcription factor ETS1, which binds the PAX7 promoter to drive its transcription, enhancing satellite cell proliferation and muscle regeneration.","method":"Satellite cell-specific Cry2 KO mice, ChIP (ETS1 at PAX7 promoter), immunostaining, ERK1/2 phosphorylation western blot, single-myofiber analysis","journal":"MedComm","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO, ChIP, defined signaling pathway, single lab","pmids":["36636367"],"is_preprint":false}],"current_model":"Mammalian CRY2 is a core circadian transcriptional repressor that suppresses CLOCK/BMAL1-driven transcription (including its own), undergoes sequential DYRK1A-then-GSK3β phosphorylation at Ser557/Ser553 to trigger FBXL3- or FBXW7-mediated ubiquitination and proteasomal degradation, directly interacts with PER2 via Cys432 to form repressor complexes, recruits phospho-T58 c-MYC to FBXL3 for degradation, and additionally functions as a corepressor for nuclear receptors; loss of both CRY1 and CRY2 abolishes circadian rhythmicity, while CRY2-specific loss causes long-period rhythms in mammals."},"narrative":{"teleology":[{"year":1999,"claim":"Whether mammalian cryptochromes were essential for circadian timekeeping was unknown; double knockout of Cry1 and Cry2 completely abolished free-running rhythmicity, while Cry2−/− alone lengthened period, establishing CRY2 as a non-redundant core clock component.","evidence":"Cry1/Cry2 single and double KO mice with wheel-running locomotor activity monitoring","pmids":["10217146"],"confidence":"High","gaps":["Mechanism of repression by CRY2 unknown at this point","Whether CRY2 has non-clock functions not addressed"]},{"year":2001,"claim":"How CRY2 achieves transcriptional repression mechanistically was unclear; mutagenesis showed that unlike CRY1, CRY2 requires an intact flavin-binding domain and conserved tryptophan electron-transport pathway for CLOCK/BMAL1 suppression, revealing distinct cofactor requirements between the two CRYs.","evidence":"Site-directed mutagenesis of conserved tryptophans in Xenopus CRY2b with luciferase reporter assay","pmids":["11747820"],"confidence":"Medium","gaps":["Performed in Xenopus CRY2b, not mouse CRY2","Whether FAD binding is catalytic or structural not resolved","No structural data at this stage"]},{"year":2002,"claim":"The feedback architecture connecting CRY2 to BMAL1 regulation was undefined; reporter assays showed CRY1/CRY2 negatively autoregulate their own transcription while positively regulating BMAL1 transcription, establishing an interlocked feedback loop model.","evidence":"Transfection/luciferase reporter assays with mouse Bmal1 promoter","pmids":["11798163"],"confidence":"Medium","gaps":["Reporter assay in transfected cells, not validated in vivo at this time","Relative contributions of CRY1 vs CRY2 to BMAL1 activation unclear"]},{"year":2009,"claim":"How CRY2 protein abundance is rhythmically controlled was unknown; identification of DYRK1A-mediated Ser557 priming phosphorylation followed by GSK-3β phosphorylation at Ser553, which triggers proteasomal degradation, revealed a two-step kinase cascade governing CRY2 turnover and circadian period.","evidence":"In vitro kinase assays, S557A/S553A mutagenesis, Dyrk1a siRNA knockdown with circadian period analysis, mouse liver fractionation","pmids":["20123978"],"confidence":"High","gaps":["Which E3 ligase acts downstream of Ser553 phosphorylation not identified here","Whether this pathway operates in all tissues unknown"]},{"year":2009,"claim":"The structural basis for CRY2-PER2 interaction and CRY2-specific repression was undefined; mutagenesis identified residues R501/K503 in the CRY2 C-terminal domain as essential for PER2 binding, and G351 as mediating a CRY2-unique repression mechanism distinct from CRY1.","evidence":"Mammalian two-hybrid, co-immunoprecipitation, random and targeted mutagenesis screens with circadian amplitude readout","pmids":["20840750","19687303"],"confidence":"Medium","gaps":["No crystal structure of CRY2-PER2 complex at this point","Whether G351 and R501/K503 act through the same or independent pathways not resolved"]},{"year":2010,"claim":"Whether CRY proteins mediate photic regulation of downstream physiology beyond the SCN was untested; Cry1/Cry2 double KO mice lost circadian melatonin rhythmicity and acute light-pulse suppression of pineal melatonin, establishing CRY as an obligate link in the SCN–pineal photic pathway.","evidence":"Cry1/Cry2 double KO mice on C3H background, pineal melatonin ELISA under LD/DD and light pulse","pmids":["20825493"],"confidence":"Medium","gaps":["Individual contributions of CRY1 vs CRY2 to melatonin regulation not separated","Mechanism downstream of SCN clock not defined"]},{"year":2013,"claim":"The relative repressive potency of CRY1 vs CRY2 in the SCN and how protein stability tunes period were unclear; genetic epistasis with the Fbxl3(Afh) stabilizing mutation showed CRY1 is more potent than CRY2 as a repressor, and CRY2 attenuates the period-lengthening effect of CRY1 in a dose-dependent manner.","evidence":"Fbxl3(Afh) mutant crossed with Cry1−/− and Cry2−/− mice, SCN bioluminescence and wheel-running behavior","pmids":["23616524"],"confidence":"High","gaps":["Biochemical basis for differential repressive potency not defined","Whether FBXL3 differentially degrades CRY1 vs CRY2 in vivo not quantified"]},{"year":2015,"claim":"Whether E3 ligases other than FBXL3 regulate CRY2 turnover was unknown; FBXW7 was shown to bind phospho-Thr300 of CRY2 and promote its ubiquitination and degradation, revealing a second E3 ligase pathway for CRY2.","evidence":"Co-IP, ubiquitination assay, Thr300 mutagenesis, CRY2 pulse-chase analysis","pmids":["25855785"],"confidence":"Medium","gaps":["Relative physiological contribution of FBXW7 vs FBXL3 to CRY2 turnover not determined","Kinase responsible for Thr300 phosphorylation not identified"]},{"year":2016,"claim":"Whether CRY2 has non-clock substrates was an open question; CRY2 was found to function as a substrate adaptor within an FBXL3-containing E3 ligase that recruits phospho-T58 c-MYC for ubiquitination and degradation, a role unique to CRY2 and not shared by CRY1.","evidence":"Co-IP, ubiquitination assays, CRY2 KO cells, c-MYC stability measurements","pmids":["27840026"],"confidence":"High","gaps":["Whether CRY2 recruits other substrates to FBXL3 beyond c-MYC not explored","Structural basis for CRY2 specificity over CRY1 in c-MYC recruitment unknown"]},{"year":2017,"claim":"Whether CRY proteins regulate transcription independently of CLOCK/BMAL1 was untested genome-wide; ChIP-seq revealed CRY1 and CRY2 bind thousands of genomic sites enriched for nuclear receptor motifs independently of other clock factors, functioning as broad nuclear receptor corepressors that modulate drug metabolism genes.","evidence":"ChIP-seq, Co-IP, genomic binding analysis in mammalian cells","pmids":["28751364"],"confidence":"Medium","gaps":["Specific nuclear receptor partners for CRY2 vs CRY1 not fully delineated","Mechanism of corepressor activity (direct DNA contact vs tethering) not resolved"]},{"year":2018,"claim":"A post-transcriptional role for CRY2 had not been described; CRY2 was shown to interact with Bclaf1 to stabilize cyclin D1 and Tmem176b mRNAs, controlling circadian myoblast proliferation and myogenic cell fusion, with Cry2−/− mice exhibiting impaired muscle regeneration.","evidence":"Co-IP of CRY2–Bclaf1, Cry2 KO mice, mRNA stability assays, muscle regeneration assays","pmids":["29466738"],"confidence":"Medium","gaps":["Full mRNA target repertoire of CRY2–Bclaf1 not defined","Whether this post-transcriptional role is circadian-gated not fully established"]},{"year":2019,"claim":"Whether the distinct period phenotypes of CRY knockouts hold in human cells was unconfirmed; CRISPR-generated CRY2 KO in human U-2 OS cells produced long-period rhythms and CRY1/CRY2 double KO arrhythmicity, confirming conserved, non-redundant roles in the human clock.","evidence":"CRISPR/Cas9 knockout with bioluminescence circadian recording in human U-2 OS cells","pmids":["31143130"],"confidence":"High","gaps":["Whether period effects are identical across human cell types not tested","Molecular basis for period lengthening vs shortening by CRY2 vs CRY1 not resolved"]},{"year":2021,"claim":"Whether cancer-associated CRY2 mutations alter its clock and tumor-suppressive functions was unknown; D325H and S510L mutations suppressed P53 target genes and accelerated growth in high-c-MYC fibroblasts, with divergent effects on circadian period and FBXL3 binding, linking specific CRY2 residues to oncogenic phenotypes.","evidence":"Stable expression of cancer-derived CRY2 mutants in primary mouse fibroblasts, P53 target gene expression, Co-IP with FBXL3, circadian period assay","pmids":["34183418"],"confidence":"Medium","gaps":["Whether these mutations are cancer drivers or passengers not definitively established","In vivo tumorigenicity of CRY2 mutants not tested"]},{"year":2022,"claim":"The structural basis for isoform-selective pharmacological modulation of CRY2 was lacking; the crystal structure of CRY2 with SHP656 revealed that selectivity is governed by the gatekeeper residue W417, whose conformational flexibility accommodates compound binding, enabling rational design of CRY2-selective modulators.","evidence":"X-ray crystallography of CRY2–SHP656 complex, molecular dynamics, W417 mutagenesis, cellular circadian assay","pmids":["36161947"],"confidence":"High","gaps":["In vivo pharmacokinetic and circadian effects of SHP656 not reported","Whether W417 conformational states are dynamically regulated by physiological signals unknown"]},{"year":2023,"claim":"The specific residue mediating PER2-dependent repression by CRY2 was undefined; Cys432 was identified as essential for PER2 association (but not BMAL1 binding), and its mutation abolished repression of Wnt pathway components and impaired adipocyte differentiation, linking CRY2's repressor function to developmental outputs.","evidence":"C432 site-directed mutagenesis, Co-IP, luciferase reporter, adipogenic differentiation assays","pmids":["37724597"],"confidence":"Medium","gaps":["Whether C432 mediates a direct protein–protein contact or acts allosterically not resolved","Structural basis of C432-PER2 interaction not determined"]},{"year":2023,"claim":"How CRY2 loss affects satellite cell biology was unexplored; conditional Cry2 KO in satellite cells activated ERK1/2–ETS1 signaling, with ETS1 directly driving PAX7 transcription to enhance proliferation and muscle regeneration, revealing a CRY2-specific growth-suppressive pathway in stem cells.","evidence":"Satellite cell-specific Cry2 KO mice, ChIP of ETS1 at PAX7 promoter, ERK1/2 phosphorylation analysis, single-myofiber culture","pmids":["36636367"],"confidence":"Medium","gaps":["Whether this pathway is clock-dependent or clock-independent not resolved","Whether findings extend to non-muscle stem cells unknown"]},{"year":null,"claim":"The full extent of CRY2-specific (non-redundant with CRY1) functions—including the scope of its substrate adaptor role for FBXL3, the structural basis of its differential potency relative to CRY1, and whether its post-transcriptional mRNA-stabilization activity is broadly deployed—remains to be defined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length CRY2–PER2 complex structure available","Complete substrate repertoire of CRY2–FBXL3 E3 ligase not cataloged","Whether CRY2 post-transcriptional functions extend beyond Bclaf1-mediated mRNA stabilization unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,6,8,9,14,15,17]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,12,16]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,13,14,15]}],"pathway":[{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[0,3,6,8,13,17]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,9,14,15]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,4,5,18]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,12]}],"complexes":["CRY2–PER2 repressor complex","SCF^FBXL3–CRY2 E3 ligase complex","CLOCK–BMAL1–CRY2 complex"],"partners":["PER2","CLOCK","BMAL1","FBXL3","FBXW7","DYRK1A","GSK3B","BCLAF1"],"other_free_text":[]},"mechanistic_narrative":"CRY2 is a core component of the mammalian circadian clock that functions as a transcriptional repressor of CLOCK/BMAL1-driven gene expression, and loss of both CRY1 and CRY2 abolishes circadian rhythmicity while CRY2-specific loss lengthens circadian period [PMID:10217146, PMID:31143130]. CRY2 represses CLOCK/BMAL1 through direct interaction with PER2 via a conserved Cys432 residue and a C-terminal domain (residues 493–512), and its stability is controlled by sequential DYRK1A/GSK-3β phosphorylation at Ser557/Ser553 followed by FBXL3- or FBXW7-mediated ubiquitination and proteasomal degradation [PMID:20123978, PMID:20840750, PMID:37724597, PMID:25855785]. Beyond its clock function, CRY2 uniquely recruits phospho-T58 c-MYC to the SCF^FBXL3 E3 ligase for degradation, acts as a corepressor for nuclear receptors at genomic sites independent of other clock factors, and stabilizes specific mRNAs through interaction with Bclaf1 to regulate myoblast proliferation and muscle regeneration [PMID:27840026, PMID:28751364, PMID:29466738]. Cancer-associated CRY2 missense mutations suppress P53 target gene expression and accelerate growth in fibroblasts with high c-MYC, linking CRY2 dysfunction to tumor-promoting phenotypes [PMID:34183418]."},"prefetch_data":{"uniprot":{"accession":"Q49AN0","full_name":"Cryptochrome-2","aliases":[],"length_aa":593,"mass_kda":66.9,"function":"Transcriptional repressor which forms a core component of the circadian clock. The circadian clock, an internal time-keeping system, regulates various physiological processes through the generation of approximately 24 hour circadian rhythms in gene expression, which are translated into rhythms in metabolism and behavior. It is derived from the Latin roots 'circa' (about) and 'diem' (day) and acts as an important regulator of a wide array of physiological functions including metabolism, sleep, body temperature, blood pressure, endocrine, immune, cardiovascular, and renal function. Consists of two major components: the central clock, residing in the suprachiasmatic nucleus (SCN) of the brain, and the peripheral clocks that are present in nearly every tissue and organ system. Both the central and peripheral clocks can be reset by environmental cues, also known as Zeitgebers (German for 'timegivers'). The predominant Zeitgeber for the central clock is light, which is sensed by retina and signals directly to the SCN. The central clock entrains the peripheral clocks through neuronal and hormonal signals, body temperature and feeding-related cues, aligning all clocks with the external light/dark cycle. Circadian rhythms allow an organism to achieve temporal homeostasis with its environment at the molecular level by regulating gene expression to create a peak of protein expression once every 24 hours to control when a particular physiological process is most active with respect to the solar day. Transcription and translation of core clock components (CLOCK, NPAS2, BMAL1, BMAL2, PER1, PER2, PER3, CRY1 and CRY2) plays a critical role in rhythm generation, whereas delays imposed by post-translational modifications (PTMs) are important for determining the period (tau) of the rhythms (tau refers to the period of a rhythm and is the length, in time, of one complete cycle). A diurnal rhythm is synchronized with the day/night cycle, while the ultradian and infradian rhythms have a period shorter and longer than 24 hours, respectively. Disruptions in the circadian rhythms contribute to the pathology of cardiovascular diseases, cancer, metabolic syndromes and aging. A transcription/translation feedback loop (TTFL) forms the core of the molecular circadian clock mechanism. Transcription factors, CLOCK or NPAS2 and BMAL1 or BMAL2, form the positive limb of the feedback loop, act in the form of a heterodimer and activate the transcription of core clock genes and clock-controlled genes (involved in key metabolic processes), harboring E-box elements (5'-CACGTG-3') within their promoters. The core clock genes: PER1/2/3 and CRY1/2 which are transcriptional repressors form the negative limb of the feedback loop and interact with the CLOCK|NPAS2-BMAL1|BMAL2 heterodimer inhibiting its activity and thereby negatively regulating their own expression. This heterodimer also activates nuclear receptors NR1D1/2 and RORA/B/G, which form a second feedback loop and which activate and repress BMAL1 transcription, respectively. CRY1 and CRY2 have redundant functions but also differential and selective contributions at least in defining the pace of the SCN circadian clock and its circadian transcriptional outputs. Less potent transcriptional repressor in cerebellum and liver than CRY1, though less effective in lengthening the period of the SCN oscillator. Seems to play a critical role in tuning SCN circadian period by opposing the action of CRY1. With CRY1, dispensable for circadian rhythm generation but necessary for the development of intercellular networks for rhythm synchrony. May mediate circadian regulation of cAMP signaling and gluconeogenesis by blocking glucagon-mediated increases in intracellular cAMP concentrations and in CREB1 phosphorylation. Besides its role in the maintenance of the circadian clock, is also involved in the regulation of other processes. Plays a key role in glucose and lipid metabolism modulation, in part, through the transcriptional regulation of genes involved in these pathways, such as LEP or ACSL4. Represses glucocorticoid receptor NR3C1/GR-induced transcriptional activity by binding to glucocorticoid response elements (GREs). Represses the CLOCK-BMAL1 induced transcription of BHLHE40/DEC1. Represses the CLOCK-BMAL1 induced transcription of NAMPT (By similarity). Represses PPARD and its target genes in the skeletal muscle and limits exercise capacity (By similarity). 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proliferation.","date":"2023","source":"MedComm","url":"https://pubmed.ncbi.nlm.nih.gov/36636367","citation_count":11,"is_preprint":false},{"pmid":"37434265","id":"PMC_37434265","title":"CircZNF367 promotes osteoclast differentiation and osteoporosis by interacting with FUS to maintain CRY2 mRNA stability.","date":"2023","source":"Journal of orthopaedic surgery and research","url":"https://pubmed.ncbi.nlm.nih.gov/37434265","citation_count":10,"is_preprint":false},{"pmid":"38513778","id":"PMC_38513778","title":"Bao Yuan decoction alleviates fatigue by restraining inflammation and oxidative stress via the AMPK/CRY2/PER1 signaling pathway.","date":"2024","source":"Journal of ethnopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38513778","citation_count":10,"is_preprint":false},{"pmid":"34584158","id":"PMC_34584158","title":"CHRONO and DEC1/DEC2 compensate for lack of CRY1/CRY2 in expression of coherent circadian rhythm but not in generation of circadian oscillation in the neonatal mouse SCN.","date":"2021","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/34584158","citation_count":10,"is_preprint":false},{"pmid":"36251035","id":"PMC_36251035","title":"CRY2 gene of rice (Oryza sativa subsp. indica) encodes a blue light sensory receptor involved in regulating flowering, plant height and partial photomorphogenesis in dark.","date":"2022","source":"Plant cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/36251035","citation_count":10,"is_preprint":false},{"pmid":"38092388","id":"PMC_38092388","title":"Copper-induced diurnal hepatic toxicity is associated with Cry2 and Per1 in mice.","date":"2023","source":"Environmental health and preventive medicine","url":"https://pubmed.ncbi.nlm.nih.gov/38092388","citation_count":9,"is_preprint":false},{"pmid":"24780222","id":"PMC_24780222","title":"Quantitative real-time kinetics of optogenetic proteins CRY2 and CIB1/N using single-molecule tools.","date":"2014","source":"Analytical 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reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/34142702","citation_count":6,"is_preprint":false},{"pmid":"32750054","id":"PMC_32750054","title":"Neither per, nor tim1, nor cry2 alone are essential components of the molecular circadian clockwork in the Madeira cockroach.","date":"2020","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/32750054","citation_count":6,"is_preprint":false},{"pmid":"15961900","id":"PMC_15961900","title":"Cloning and expression analysis of CRY2 gene in Sorghum bicolor.","date":"2005","source":"Zhi wu sheng li yu fen zi sheng wu xue xue bao = Journal of plant physiology and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15961900","citation_count":5,"is_preprint":false},{"pmid":"39551335","id":"PMC_39551335","title":"Analysis of how melatonin-upregulated clock genes PER2 and CRY2 alleviate rheumatoid arthritis-associated interstitial lung disease.","date":"2024","source":"European journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/39551335","citation_count":5,"is_preprint":false},{"pmid":"37724597","id":"PMC_37724597","title":"Transcription Repression of CRY2 via PER2 Interaction Promotes Adipogenesis.","date":"2023","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/37724597","citation_count":4,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47578,"output_tokens":4937,"usd":0.108395},"stage2":{"model":"claude-opus-4-6","input_tokens":8463,"output_tokens":4365,"usd":0.22716},"total_usd":0.335555,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"CRY1 and CRY2 are essential components of the mammalian circadian oscillator; mice lacking both proteins display instantaneous and complete loss of free-running circadian rhythmicity, while single knockouts show accelerated (Cry1-/-) or delayed (Cry2-/-) free-running periodicity of locomotor activity.\",\n      \"method\": \"Genetic knockout (Cry1-/-, Cry2-/-, Cry1-/-Cry2-/- double knockout mice), locomotor activity monitoring\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined phenotypic readout, foundational study replicated broadly\",\n      \"pmids\": [\"10217146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CRY1 and CRY2 upregulate BMAL1 transcription and negatively autoregulate their own expression via an interlocked feedback loop; BMAL1-CLOCK dimers repress BMAL1, while CRY1, CRY2, and PER2 activate BMAL1 transcription, forming a third positive forward loop.\",\n      \"method\": \"Transfection/luciferase reporter assays, characterization of mouse Bmal1 promoter genomic structure\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay in cells, single lab\",\n      \"pmids\": [\"11798163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"An intact flavin-binding domain is required for normal CRY2 function in suppressing CLOCK/BMAL1-mediated transcription; mutation of any of the three conserved tryptophan residues in the putative electron transport chain inhibits xCRY2b function, indicating CRY2 depends on electron transport through the conserved tryptophan pathway, unlike CRY1.\",\n      \"method\": \"Site-directed mutagenesis of conserved tryptophan residues, luciferase reporter suppression assay in Xenopus CRY2b\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with functional readout, single lab\",\n      \"pmids\": [\"11747820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mammalian CRY2 undergoes rhythmic phosphorylation; DYRK1A phosphorylates Ser557 as a priming event for subsequent GSK-3β-mediated phosphorylation of Ser553, which promotes proteasomal degradation of CRY2. DYRK1A kinase activity toward Ser557 shows circadian variation in mouse liver, and knockdown of Dyrk1a causes abnormal CRY2 accumulation and shortened circadian period.\",\n      \"method\": \"In vitro kinase assay, mutagenesis (S557A/S553A), siRNA knockdown, circadian period analysis in cells, mouse liver fractionation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay + mutagenesis + cellular period phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"20123978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CRY2 functions as a component of an FBXL3-containing E3 ubiquitin ligase that recruits T58-phosphorylated c-MYC for ubiquitylation and proteasomal degradation; CRY1 cannot substitute for CRY2 in this function.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, genetic loss-of-function (CRY2 KO cells), c-MYC stability assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — Co-IP, ubiquitination assay, KO with substrate turnover readout, multiple orthogonal methods in single rigorous paper\",\n      \"pmids\": [\"27840026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FBXW7 is an E3 ubiquitin ligase that targets CRY2 for proteasomal degradation by binding directly to phosphorylated Thr300 of CRY2; FBXW7 enhances CRY2 ubiquitination and accelerates its turnover.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, mutagenesis (Thr300 phosphorylation site), CRY2 turnover/pulse-chase analysis\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination assay and mutagenesis in single lab\",\n      \"pmids\": [\"25855785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CRY1 and CRY2 are both transcriptional repressors of clock-controlled genes in the SCN, but CRY1 is more potent; CRY2 also attenuates the period-lengthening effect of CRY1. Stabilization of either CRY protein via the Fbxl3(Afh) mutation lengthens circadian period in a dose-dependent manner.\",\n      \"method\": \"Genetic epistasis using Fbxl3(Afh) mutant combined with Cry1-/- and Cry2-/- mice; bioluminescence recordings of SCN slices, wheel-running behavior\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic epistasis with defined circadian period and SCN transcriptional suppression phenotypes\",\n      \"pmids\": [\"23616524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mutagenesis of mouse CRY2 identified a region (residues 493–512) in the C-terminal domain responsible for direct physical interaction with PER2; mutation of Arg-501 and Lys-503 abolishes this interaction.\",\n      \"method\": \"Mammalian two-hybrid assay, co-immunoprecipitation, oligonucleotide-based degenerate PCR mutagenesis\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and mutagenesis identifying specific residues, single lab\",\n      \"pmids\": [\"20840750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mutagenesis screen identified CRY2 residue G354 as critical for clock protein binding (required for repression by both CRYs), and G351 as specific to a CRY2-unique repression mechanism; overexpression of CRY2G351D abolishes circadian rhythmicity in NIH 3T3 cells.\",\n      \"method\": \"Random mutagenesis, cell-based screen for CLOCK-BMAL1 repression, protein binding assays, circadian rhythm amplitude measurements\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis screen + functional clock assays, single lab\",\n      \"pmids\": [\"19687303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CRY1 and CRY2 broadly interact with nuclear receptors and serve as corepressors, binding independently of other core clock factors to many genomic sites enriched for nuclear receptor recognition motifs, contributing to diurnal modulation of drug metabolism.\",\n      \"method\": \"ChIP-seq, Co-IP, genomic binding analysis in mammalian cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq and Co-IP, single lab with multiple methods\",\n      \"pmids\": [\"28751364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRY2 (but not CRY1) specifically interacts with Bclaf1 to stabilize mRNAs encoding cyclin D1 and Tmem176b, regulating circadian patterns of myoblast proliferation and myogenic cell fusion; Cry2-/- mice show impaired muscle regeneration.\",\n      \"method\": \"Co-immunoprecipitation (Cry2-Bclaf1), Cry2 KO mice, muscle regeneration assays, mRNA stability assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, KO mouse with defined cellular phenotype and post-transcriptional mechanism, single lab\",\n      \"pmids\": [\"29466738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cry1/Cry2 double-deficient mice lose circadian rhythmicity of pineal melatonin concentration and fail to suppress melatonin in response to an acute light pulse, demonstrating CRY proteins mediate photic signals from the SCN to the pineal gland.\",\n      \"method\": \"Cry1/Cry2 double KO mice (C3H background), pineal melatonin measurement by ELISA under LD and DD conditions, acute light-pulse suppression test\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined biochemical and physiological readout\",\n      \"pmids\": [\"20825493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRY2 missense mutations D325H and S510L (found in human cancers) suppress P53 target gene expression and accelerate growth of primary mouse fibroblasts expressing high c-MYC; the mutants have divergent effects on circadian rhythms and CRY2–SCFFBXL3 interaction.\",\n      \"method\": \"Cancer genome atlas mutation analysis, stable expression of CRY2 mutants in primary mouse fibroblasts, P53 target gene expression, circadian period assay, Co-IP with FBXL3\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis, Co-IP, functional cell growth and gene expression assays, single lab\",\n      \"pmids\": [\"34183418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CRY2 isoform selectivity of the small-molecule modulator SHP656 is determined by the gatekeeper residue W417 in CRY2; X-ray crystal structure of CRY2 complexed with SHP656 shows compound binding is compatible with the intrinsic 'in' and 'further in' orientations of W417, and perturbation of this residue reduces SHP656 efficacy.\",\n      \"method\": \"X-ray crystallography (CRY2–SHP656 complex), molecular dynamics simulations, cellular circadian period assay, CRY1/CRY2 KO cell selectivity testing\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mutagenesis validation and functional cellular assay, single rigorous study\",\n      \"pmids\": [\"36161947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CRY2 represses CLOCK/BMAL1 transcriptional activation via a conserved Cys432-mediated interaction with PER2; mutagenesis of C432 disrupts PER2 association but not BMAL1 binding, abolishing repression of Wnt pathway components and impairing adipocyte differentiation.\",\n      \"method\": \"Site-directed mutagenesis (C432), co-immunoprecipitation, luciferase reporter assay, adipogenic differentiation assays, CRY2 stabilization with KL001\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis identifying specific residue + Co-IP + functional differentiation assay, single lab\",\n      \"pmids\": [\"37724597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CRY2 inhibits the CLOCK/BMAL1 complex to suppress transcription of P300; silencing CRY2 releases CLOCK/BMAL1 to bind the P300 E-box and drive P300 expression, which then acetylates histone 3 and forms a transcriptional complex with Runx2 to promote osteoblast differentiation.\",\n      \"method\": \"CRY2 knockdown/overexpression, ChIP assay (CLOCK/BMAL1 at P300 promoter), Co-IP (CRY2-CLOCK/BMAL1), osteoblast differentiation markers\",\n      \"journal\": \"Molecular therapy. Nucleic acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ChIP, KD/OE with mechanistic pathway placement, single lab\",\n      \"pmids\": [\"31982773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CRY2 suppresses trophoblast migration and invasion by inhibiting the c-Myc–BMAL1 pathway; CRY2 overexpression impairs migration/invasion, while CRY2 knockdown restores it. Mechanistically, c-Myc binds the BMAL1 promoter to drive BMAL1 transcription and activate MMP2/9, and CRY2 inhibits this pathway.\",\n      \"method\": \"CRY2 overexpression/knockdown in HTR-8/SVneo cells, wound healing/transwell assays, luciferase reporter and ChIP assay (c-Myc at BMAL1 promoter), western blot for MMP2/9\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP/ChIP, KD/OE with mechanistic pathway, single lab\",\n      \"pmids\": [\"31536114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CRISPR/Cas9-generated human CRY2 knockout cells display long-period circadian rhythms, whereas CRY1 KO cells show short-period rhythms, and CRY1/CRY2 double KO cells are arrhythmic, confirming distinct and essential roles for each CRY in human circadian timekeeping.\",\n      \"method\": \"CRISPR/Cas9 knockout (duplex, exon deletion), bioluminescence circadian rhythm recording in human U-2 OS cells\",\n      \"journal\": \"Frontiers in physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean CRISPR KO with quantitative circadian period readout, consistent with multiple prior animal KO studies\",\n      \"pmids\": [\"31143130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MALAT1 long non-coding RNA recruits the E3 ubiquitin ligase FBXW7 to promote CRY2 ubiquitin-mediated proteasomal degradation in trophoblasts; MALAT1 downregulation stabilizes CRY2 and impairs trophoblast migration/invasion.\",\n      \"method\": \"RNA pull-down, Co-IP (FBXW7-CRY2 interaction), CRY2 ubiquitination assay, MALAT1 KD with functional migration/invasion assays\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNA pull-down, Co-IP, ubiquitination assay with functional consequence, single lab\",\n      \"pmids\": [\"32776544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cry1 and Cry2 double-deficient mice (C3H strain) lose circadian rhythmicity of pineal melatonin and fail to suppress melatonin after an acute light pulse, indicating CRY genes mediate both circadian and photic regulation of the SCN-pineal axis.\",\n      \"method\": \"Double KO mice, pineal melatonin ELISA under LD and DD, light-pulse experiment\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with biochemical readout, single paper\",\n      \"pmids\": [\"20825493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss of CRY2 in satellite cells activates the ERK1/2 signaling pathway and the transcription factor ETS1, which binds the PAX7 promoter to drive its transcription, enhancing satellite cell proliferation and muscle regeneration.\",\n      \"method\": \"Satellite cell-specific Cry2 KO mice, ChIP (ETS1 at PAX7 promoter), immunostaining, ERK1/2 phosphorylation western blot, single-myofiber analysis\",\n      \"journal\": \"MedComm\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO, ChIP, defined signaling pathway, single lab\",\n      \"pmids\": [\"36636367\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Mammalian CRY2 is a core circadian transcriptional repressor that suppresses CLOCK/BMAL1-driven transcription (including its own), undergoes sequential DYRK1A-then-GSK3β phosphorylation at Ser557/Ser553 to trigger FBXL3- or FBXW7-mediated ubiquitination and proteasomal degradation, directly interacts with PER2 via Cys432 to form repressor complexes, recruits phospho-T58 c-MYC to FBXL3 for degradation, and additionally functions as a corepressor for nuclear receptors; loss of both CRY1 and CRY2 abolishes circadian rhythmicity, while CRY2-specific loss causes long-period rhythms in mammals.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CRY2 is a core component of the mammalian circadian clock that functions as a transcriptional repressor of CLOCK/BMAL1-driven gene expression, and loss of both CRY1 and CRY2 abolishes circadian rhythmicity while CRY2-specific loss lengthens circadian period [PMID:10217146, PMID:31143130]. CRY2 represses CLOCK/BMAL1 through direct interaction with PER2 via a conserved Cys432 residue and a C-terminal domain (residues 493–512), and its stability is controlled by sequential DYRK1A/GSK-3β phosphorylation at Ser557/Ser553 followed by FBXL3- or FBXW7-mediated ubiquitination and proteasomal degradation [PMID:20123978, PMID:20840750, PMID:37724597, PMID:25855785]. Beyond its clock function, CRY2 uniquely recruits phospho-T58 c-MYC to the SCF^FBXL3 E3 ligase for degradation, acts as a corepressor for nuclear receptors at genomic sites independent of other clock factors, and stabilizes specific mRNAs through interaction with Bclaf1 to regulate myoblast proliferation and muscle regeneration [PMID:27840026, PMID:28751364, PMID:29466738]. Cancer-associated CRY2 missense mutations suppress P53 target gene expression and accelerate growth in fibroblasts with high c-MYC, linking CRY2 dysfunction to tumor-promoting phenotypes [PMID:34183418].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Whether mammalian cryptochromes were essential for circadian timekeeping was unknown; double knockout of Cry1 and Cry2 completely abolished free-running rhythmicity, while Cry2−/− alone lengthened period, establishing CRY2 as a non-redundant core clock component.\",\n      \"evidence\": \"Cry1/Cry2 single and double KO mice with wheel-running locomotor activity monitoring\",\n      \"pmids\": [\"10217146\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of repression by CRY2 unknown at this point\", \"Whether CRY2 has non-clock functions not addressed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"How CRY2 achieves transcriptional repression mechanistically was unclear; mutagenesis showed that unlike CRY1, CRY2 requires an intact flavin-binding domain and conserved tryptophan electron-transport pathway for CLOCK/BMAL1 suppression, revealing distinct cofactor requirements between the two CRYs.\",\n      \"evidence\": \"Site-directed mutagenesis of conserved tryptophans in Xenopus CRY2b with luciferase reporter assay\",\n      \"pmids\": [\"11747820\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Performed in Xenopus CRY2b, not mouse CRY2\", \"Whether FAD binding is catalytic or structural not resolved\", \"No structural data at this stage\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"The feedback architecture connecting CRY2 to BMAL1 regulation was undefined; reporter assays showed CRY1/CRY2 negatively autoregulate their own transcription while positively regulating BMAL1 transcription, establishing an interlocked feedback loop model.\",\n      \"evidence\": \"Transfection/luciferase reporter assays with mouse Bmal1 promoter\",\n      \"pmids\": [\"11798163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reporter assay in transfected cells, not validated in vivo at this time\", \"Relative contributions of CRY1 vs CRY2 to BMAL1 activation unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"How CRY2 protein abundance is rhythmically controlled was unknown; identification of DYRK1A-mediated Ser557 priming phosphorylation followed by GSK-3β phosphorylation at Ser553, which triggers proteasomal degradation, revealed a two-step kinase cascade governing CRY2 turnover and circadian period.\",\n      \"evidence\": \"In vitro kinase assays, S557A/S553A mutagenesis, Dyrk1a siRNA knockdown with circadian period analysis, mouse liver fractionation\",\n      \"pmids\": [\"20123978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which E3 ligase acts downstream of Ser553 phosphorylation not identified here\", \"Whether this pathway operates in all tissues unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The structural basis for CRY2-PER2 interaction and CRY2-specific repression was undefined; mutagenesis identified residues R501/K503 in the CRY2 C-terminal domain as essential for PER2 binding, and G351 as mediating a CRY2-unique repression mechanism distinct from CRY1.\",\n      \"evidence\": \"Mammalian two-hybrid, co-immunoprecipitation, random and targeted mutagenesis screens with circadian amplitude readout\",\n      \"pmids\": [\"20840750\", \"19687303\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No crystal structure of CRY2-PER2 complex at this point\", \"Whether G351 and R501/K503 act through the same or independent pathways not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Whether CRY proteins mediate photic regulation of downstream physiology beyond the SCN was untested; Cry1/Cry2 double KO mice lost circadian melatonin rhythmicity and acute light-pulse suppression of pineal melatonin, establishing CRY as an obligate link in the SCN–pineal photic pathway.\",\n      \"evidence\": \"Cry1/Cry2 double KO mice on C3H background, pineal melatonin ELISA under LD/DD and light pulse\",\n      \"pmids\": [\"20825493\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Individual contributions of CRY1 vs CRY2 to melatonin regulation not separated\", \"Mechanism downstream of SCN clock not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The relative repressive potency of CRY1 vs CRY2 in the SCN and how protein stability tunes period were unclear; genetic epistasis with the Fbxl3(Afh) stabilizing mutation showed CRY1 is more potent than CRY2 as a repressor, and CRY2 attenuates the period-lengthening effect of CRY1 in a dose-dependent manner.\",\n      \"evidence\": \"Fbxl3(Afh) mutant crossed with Cry1−/− and Cry2−/− mice, SCN bioluminescence and wheel-running behavior\",\n      \"pmids\": [\"23616524\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical basis for differential repressive potency not defined\", \"Whether FBXL3 differentially degrades CRY1 vs CRY2 in vivo not quantified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Whether E3 ligases other than FBXL3 regulate CRY2 turnover was unknown; FBXW7 was shown to bind phospho-Thr300 of CRY2 and promote its ubiquitination and degradation, revealing a second E3 ligase pathway for CRY2.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, Thr300 mutagenesis, CRY2 pulse-chase analysis\",\n      \"pmids\": [\"25855785\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative physiological contribution of FBXW7 vs FBXL3 to CRY2 turnover not determined\", \"Kinase responsible for Thr300 phosphorylation not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Whether CRY2 has non-clock substrates was an open question; CRY2 was found to function as a substrate adaptor within an FBXL3-containing E3 ligase that recruits phospho-T58 c-MYC for ubiquitination and degradation, a role unique to CRY2 and not shared by CRY1.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, CRY2 KO cells, c-MYC stability measurements\",\n      \"pmids\": [\"27840026\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CRY2 recruits other substrates to FBXL3 beyond c-MYC not explored\", \"Structural basis for CRY2 specificity over CRY1 in c-MYC recruitment unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Whether CRY proteins regulate transcription independently of CLOCK/BMAL1 was untested genome-wide; ChIP-seq revealed CRY1 and CRY2 bind thousands of genomic sites enriched for nuclear receptor motifs independently of other clock factors, functioning as broad nuclear receptor corepressors that modulate drug metabolism genes.\",\n      \"evidence\": \"ChIP-seq, Co-IP, genomic binding analysis in mammalian cells\",\n      \"pmids\": [\"28751364\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific nuclear receptor partners for CRY2 vs CRY1 not fully delineated\", \"Mechanism of corepressor activity (direct DNA contact vs tethering) not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A post-transcriptional role for CRY2 had not been described; CRY2 was shown to interact with Bclaf1 to stabilize cyclin D1 and Tmem176b mRNAs, controlling circadian myoblast proliferation and myogenic cell fusion, with Cry2−/− mice exhibiting impaired muscle regeneration.\",\n      \"evidence\": \"Co-IP of CRY2–Bclaf1, Cry2 KO mice, mRNA stability assays, muscle regeneration assays\",\n      \"pmids\": [\"29466738\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Full mRNA target repertoire of CRY2–Bclaf1 not defined\", \"Whether this post-transcriptional role is circadian-gated not fully established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Whether the distinct period phenotypes of CRY knockouts hold in human cells was unconfirmed; CRISPR-generated CRY2 KO in human U-2 OS cells produced long-period rhythms and CRY1/CRY2 double KO arrhythmicity, confirming conserved, non-redundant roles in the human clock.\",\n      \"evidence\": \"CRISPR/Cas9 knockout with bioluminescence circadian recording in human U-2 OS cells\",\n      \"pmids\": [\"31143130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether period effects are identical across human cell types not tested\", \"Molecular basis for period lengthening vs shortening by CRY2 vs CRY1 not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Whether cancer-associated CRY2 mutations alter its clock and tumor-suppressive functions was unknown; D325H and S510L mutations suppressed P53 target genes and accelerated growth in high-c-MYC fibroblasts, with divergent effects on circadian period and FBXL3 binding, linking specific CRY2 residues to oncogenic phenotypes.\",\n      \"evidence\": \"Stable expression of cancer-derived CRY2 mutants in primary mouse fibroblasts, P53 target gene expression, Co-IP with FBXL3, circadian period assay\",\n      \"pmids\": [\"34183418\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether these mutations are cancer drivers or passengers not definitively established\", \"In vivo tumorigenicity of CRY2 mutants not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The structural basis for isoform-selective pharmacological modulation of CRY2 was lacking; the crystal structure of CRY2 with SHP656 revealed that selectivity is governed by the gatekeeper residue W417, whose conformational flexibility accommodates compound binding, enabling rational design of CRY2-selective modulators.\",\n      \"evidence\": \"X-ray crystallography of CRY2–SHP656 complex, molecular dynamics, W417 mutagenesis, cellular circadian assay\",\n      \"pmids\": [\"36161947\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo pharmacokinetic and circadian effects of SHP656 not reported\", \"Whether W417 conformational states are dynamically regulated by physiological signals unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The specific residue mediating PER2-dependent repression by CRY2 was undefined; Cys432 was identified as essential for PER2 association (but not BMAL1 binding), and its mutation abolished repression of Wnt pathway components and impaired adipocyte differentiation, linking CRY2's repressor function to developmental outputs.\",\n      \"evidence\": \"C432 site-directed mutagenesis, Co-IP, luciferase reporter, adipogenic differentiation assays\",\n      \"pmids\": [\"37724597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether C432 mediates a direct protein–protein contact or acts allosterically not resolved\", \"Structural basis of C432-PER2 interaction not determined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"How CRY2 loss affects satellite cell biology was unexplored; conditional Cry2 KO in satellite cells activated ERK1/2–ETS1 signaling, with ETS1 directly driving PAX7 transcription to enhance proliferation and muscle regeneration, revealing a CRY2-specific growth-suppressive pathway in stem cells.\",\n      \"evidence\": \"Satellite cell-specific Cry2 KO mice, ChIP of ETS1 at PAX7 promoter, ERK1/2 phosphorylation analysis, single-myofiber culture\",\n      \"pmids\": [\"36636367\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this pathway is clock-dependent or clock-independent not resolved\", \"Whether findings extend to non-muscle stem cells unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The full extent of CRY2-specific (non-redundant with CRY1) functions—including the scope of its substrate adaptor role for FBXL3, the structural basis of its differential potency relative to CRY1, and whether its post-transcriptional mRNA-stabilization activity is broadly deployed—remains to be defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length CRY2–PER2 complex structure available\", \"Complete substrate repertoire of CRY2–FBXL3 E3 ligase not cataloged\", \"Whether CRY2 post-transcriptional functions extend beyond Bclaf1-mediated mRNA stabilization unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 6, 8, 9, 14, 15, 17]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 12, 16]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 13, 14, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [0, 3, 6, 8, 13, 17]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 9, 14, 15]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 4, 5, 18]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 12]}\n    ],\n    \"complexes\": [\n      \"CRY2–PER2 repressor complex\",\n      \"SCF^FBXL3–CRY2 E3 ligase complex\",\n      \"CLOCK–BMAL1–CRY2 complex\"\n    ],\n    \"partners\": [\n      \"PER2\",\n      \"CLOCK\",\n      \"BMAL1\",\n      \"FBXL3\",\n      \"FBXW7\",\n      \"DYRK1A\",\n      \"GSK3B\",\n      \"BCLAF1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}