{"gene":"DTL","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2006,"finding":"DTL/CDT2/DCAF2 is a substrate receptor (DCAF) for the CUL4-DDB1 E3 ubiquitin ligase complex. It is recruited to replication forks via CDT1 and PCNA, where it ubiquitylates CDT1 to promote its destruction in S phase and after DNA damage, preventing rereplication. Depletion of human CDT2 causes rereplication and checkpoint activation.","method":"Affinity purification/mass spectrometry identification of DCAFs; Xenopus egg extract depletion/reconstitution assays; siRNA knockdown in human cells; Co-IP; cell cycle analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution in Xenopus extracts plus human cell knockdown with defined phenotype, multiple orthogonal methods, replicated across labs","pmids":["16949367"],"is_preprint":false},{"year":2006,"finding":"L2DTL/CDT2 associates with CUL4, DDB1, and PCNA in human cells, and loss of L2DTL suppresses CDT1 proteolysis in response to DNA damage. PCNA interacts with CDT1 and is required for CDT1 proteolysis after DNA damage. Inactivation of L2DTL causes dissociation of DDB1 from the CUL4 complex.","method":"Anti-CUL4 antibody affinity chromatography/mass spectrometry; anti-L2DTL immunoaffinity chromatography; Co-IP; siRNA knockdown in Drosophila S2 and human cells; Western blot","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal affinity purification, Co-IP, and functional knockdown with defined substrate phenotype, replicated in two cell systems","pmids":["16861906"],"is_preprint":false},{"year":2006,"finding":"L2DTL/CDT2 and PCNA physically interact with p53 and MDM2/HDM2. CUL4A complexes display polyubiquitination activity towards p53 dependent on L2DTL, PCNA, DDB1, ROC1, and MDM2. Inactivation of CUL4A, L2DTL, PCNA, DDB1, or ROC1 induces p53 stabilization and growth arrest. MDM2 is rapidly proteolyzed after UV irradiation through a CUL4/DDB1- and PCNA-regulated mechanism.","method":"Co-IP; in vitro ubiquitination assay; siRNA knockdown; Western blot","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro ubiquitination assay with Co-IP, single lab, multiple substrates tested","pmids":["16861890"],"is_preprint":false},{"year":2006,"finding":"DTL/CDT2 is an essential component of the CUL4-DDB1 E3 ubiquitin ligase that controls CDT1 levels, preventing rereplication. DTL is also required for the early radiation-induced G2/M checkpoint independently of CDT1. In zebrafish, reduction of Cdt1 suppresses the rereplication defect of dtl/cdt2-deficient fish but not the G2/M checkpoint defect, establishing two distinct mechanistic roles.","method":"Zebrafish forward genetic screen; genetic epistasis (cdt1 reduction in dtl mutants); human DTL siRNA knockdown; cell cycle analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in zebrafish plus human cell knockdown with two distinct phenotypic readouts, cross-species validation","pmids":["17085480"],"is_preprint":false},{"year":2006,"finding":"L2dtl gene knockout in mice results in early embryonic lethality at the 4-8 cell stage. siRNA-mediated depletion of L2dtl in mouse embryos causes cell cycle progression failure, mitotic catastrophe (chromosomal fragmentation and lagging), and failure to develop to blastocysts. In HeLa cells, L2dtl depletion results in multinucleation and downregulation of PCNA and PTTG1/securin.","method":"Targeted gene disruption in mice; microinjection of siRNA into two-cell embryos; RNAi in HeLa cells; morphological analysis; Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse model and siRNA knockdown with defined embryonic and cellular phenotypes, multiple methods","pmids":["17107960"],"is_preprint":false},{"year":2006,"finding":"L2DTL protein localizes to the nucleus during interphase and concentrates at centrosomes (co-localizing with gamma-tubulin and Aurora-A) throughout the cell cycle. L2DTL protein is degraded in mitosis by the APC/C-Cdh1 complex. L2DTL gene expression peaks at G1/S phase.","method":"Immunostaining; Western blotting; centrosome isolation/co-fractionation with gamma-tubulin; cell cycle synchronization","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by immunostaining plus biochemical fractionation and APC/C-Cdh1 degradation identification, single lab","pmids":["17106265"],"is_preprint":false},{"year":2008,"finding":"DTL/RAMP protein shows cell-cycle-dependent localization in breast cancer cells: nuclear during interphase and concentrated at the contractile ring during cytokinesis. DTL/RAMP is phosphorylated by Aurora kinase B (AURKB) in vitro. Depletion of AURKB reduces DTL/RAMP phosphorylation and decreases DTL/RAMP protein stability.","method":"Immunocytochemistry; Western blot; in vitro kinase assay with AURKB; siRNA knockdown of AURKB; cell cycle analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay plus cellular localization and protein stability experiments, single lab","pmids":["18542055"],"is_preprint":false},{"year":2010,"finding":"CRL4(CDT2) ubiquitylates and destroys the histone methyltransferase Set8/PR-Set7 during S phase and after DNA damage. Set8 ubiquitylation occurs on chromatin and requires a specific PIP degron in Set8 that binds PCNA. Inactivation of CRL4(CDT2) leads to Set8 stabilization, aberrant H4K20me1 accumulation, premature chromatin compaction, and checkpoint-mediated G2 arrest.","method":"siRNA knockdown; overexpression of Set8 PIP-degron mutant; cell cycle analysis; H4K20me1 chromatin immunoprecipitation; Western blot","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — degron mutagenesis plus cellular phenotype with mechanistic readout, replicated by independent lab (PMID 21220508)","pmids":["20932472","21220508"],"is_preprint":false},{"year":2010,"finding":"CRL4(CDT2) E3 ubiquitin ligase monoubiquitinates PCNA at Lys164 independently of Rad18 in proliferating cells. This is antagonized by USP1. CRL4(CDT2)-mediated PCNA monoubiquitination promotes translesion DNA synthesis (TLS) in nondamaged cells.","method":"In vitro ubiquitination assay; siRNA knockdown of CRL4(CDT2) components; PCNA Lys164 mutagenesis; TLS assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination with site-specific mutagenesis plus cellular TLS functional assay, single lab but multiple orthogonal methods","pmids":["20129063"],"is_preprint":false},{"year":2010,"finding":"PR-Set7 is degraded during S phase and after DNA damage via PCNA-coupled CRL4(CDT2)-dependent proteolysis. PR-Set7 interaction with PCNA through a specialized 'PIP degron' domain targets it for this degradation. PR-Set7 is transiently recruited to laser-induced DNA damage sites through its interaction with PCNA, and 53BP1 recruitment to damage sites depends on PR-Set7 catalytic activity.","method":"Western blot; PIP degron mutagenesis; laser micro-irradiation live imaging; siRNA knockdown; cell cycle analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — PIP degron mutagenesis plus live imaging and functional assay, replicated independently (PMID 20932472, 21220508)","pmids":["21035370"],"is_preprint":false},{"year":2011,"finding":"In Drosophila endocycles, S-phase activates the CRL4(CDT2) ubiquitin ligase, which mediates destruction of E2F1 transcription factor. This creates a molecular oscillator: E2F1 promotes CycE expression and S-phase initiation, S-phase activates CRL4(CDT2), which destroys E2F1, allowing low CDK activity needed for pre-RC formation for the next S-phase.","method":"Genetic epistasis in Drosophila; computational modeling; overexpression/stabilized E2F1 mutant analysis; genetic tests","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis combined with computational modeling and multiple genetic tests in Drosophila","pmids":["22037307"],"is_preprint":false},{"year":2011,"finding":"CRL4(CDT2) targets CHK1 for ubiquitin-mediated destruction in the nucleoplasm (not on chromatin) in a PCNA-independent manner, targeting the activated form of CHK1. CDT2-depleted cells show G2 arrest, and CHK1 activity is required for maintaining this G2 arrest. CRL1 and CRL4 both ubiquitinate CHK1 but bind CHK1 in distinct cellular compartments.","method":"Co-IP; siRNA knockdown; Western blot; cell cycle analysis; compartment fractionation","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional knockdown with compartment fractionation, single lab","pmids":["23109433"],"is_preprint":false},{"year":2011,"finding":"MNNG-induced DNA alkylation triggers rapid p21 degradation via the ubiquitin ligase CDT2 and the proteasome. This degradation requires MSH2 but not MLH1, and requires p21's ability to bind PCNA. MNNG induces formation of PCNA complexes with MSH6 and CDT2. When p21 degradation is blocked, MMR protein recruitment to chromatin is reduced.","method":"SiRNA knockdown; Western blot; p21 PCNA-binding mutant analysis; chromatin fractionation; PCNA Co-IP","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic perturbations with mechanistic mutant analysis, single lab","pmids":["21725088"],"is_preprint":false},{"year":2010,"finding":"CRL4(CDT2)-mediated substrate degradation requires two elements in the substrate PIP box: TD amino acid residues within the PIP box and a basic amino acid at +4 (and +3) downstream of the PIP box. An acidic amino acid following these basic residues abolishes degradation. Introducing all required elements into ligase I peptide renders it degradable.","method":"Chimera constructs of CDT1 and Ligase I; mutagenesis; degradation assays in HeLa cells; electrostatic surface analysis","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis with reconstitution of degron in non-substrate, defining structural requirements, single lab","pmids":["21143559"],"is_preprint":false},{"year":2013,"finding":"SCF(FBXO11)/CRL1 interacts with CDT2 and recruits it for proteasomal degradation, thereby restraining CRL4(CDT2) activity. CDK-mediated phosphorylation of CDT2 at Thr464 inhibits recognition by FBXO11. This cross-regulation between SCF(FBXO11) and CRL4(CDT2) is evolutionarily conserved from worms to humans and regulates timing of cell-cycle exit.","method":"Affinity purification/mass spectrometry; Co-IP; CDT2 Thr464 mutagenesis; degradation assays; C. elegans epistasis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — phospho-degron mutagenesis, MS-based interaction discovery, cross-species conservation, two independent labs reporting simultaneously (PMID 23478441 and 23478445)","pmids":["23478441","23478445"],"is_preprint":false},{"year":2013,"finding":"CDT2 undergoes autoubiquitylation by CRL4A E3 ubiquitin ligase, and is additionally polyubiquitylated and degraded by CRL1(FBXO11). CRL1(FBXO11)-mediated degradation of CDT2 stabilizes p21 and Set8, which is important during TGF-β response—Set8 induction turns off Smad2 activation. CDT2 downregulation via CRL1(FBXO11) also stimulates epithelial cell migration.","method":"Co-IP; in vitro ubiquitination assay; siRNA knockdown; TGF-β signaling assays; cell migration assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro ubiquitination plus defined downstream signaling consequence, two labs reporting simultaneously","pmids":["23478445","23478441"],"is_preprint":false},{"year":2013,"finding":"CRL4(CDT2) promotes degradation of the DNA repair helicase FBH1 after DNA damage in a PCNA- and PIP-degron-dependent manner. FBH1's anti-recombinase activity is partially dependent on its interaction with PCNA. Degradation of FBH1 by CDT2-proteasome pathway facilitates TLS polymerase eta recruitment to chromatin in UV-irradiated cells.","method":"SiRNA knockdown; non-degradable FBH1 mutant expression; Co-IP; immunofluorescence; chromatin fractionation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — non-degradable mutant plus functional TLS polymerase recruitment assay, single lab","pmids":["23677613"],"is_preprint":false},{"year":2013,"finding":"CRL4(CDT2) regulates the subunit composition of DNA polymerase delta (Pol δ) by targeting the p12 subunit for degradation in response to DNA damage and during S phase entry. The p12 subunit possesses a PIP-degron. Knockdown of CUL4A or CUL4B inhibits p12 degradation. Mutation of the p12 PIP-degron prevents its S phase reduction.","method":"SiRNA knockdown; PIP-degron mutagenesis; laser scanning cytometry; Western blot; cell synchronization","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PIP-degron mutagenesis with cellular degradation assay and synchronization, single lab","pmids":["23913683"],"is_preprint":false},{"year":2014,"finding":"14-3-3 adaptor proteins interact with CDT2 phosphorylated at Thr464 and shield CDT2 from polyubiquitination and proteasomal degradation by FbxO11. Depletion of 14-3-3 proteins promotes FbxO11–CDT2 interaction. The stabilization of CDT2 by 14-3-3 proteins is important for cell cycle progression; depletion of 14-3-3γ leads to G2/M delay partly due to Set8 accumulation.","method":"Co-IP; phospho-mimicking/blocking CDT2 mutations (T464D/T464A); siRNA knockdown; ubiquitination assay; cell cycle analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phospho-mimicking mutagenesis plus Co-IP and functional cell cycle readout, single lab","pmids":["25154416"],"is_preprint":false},{"year":2015,"finding":"CRL4(CDT2) promotes degradation of XPG endonuclease after its action on bulky DNA lesions (UV, cisplatin) during nucleotide excision repair. CDT2 is recruited to UV-damage sites and interacts with XPG in the presence of PCNA. CDT2-mediated XPG degradation is required for subsequent DNA polymerase delta recruitment and gap-filling DNA synthesis (completion of NER).","method":"SiRNA knockdown; micropore UV irradiation; in situ Proximity Ligation Assay; immunofluorescence; DNA repair synthesis assay","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PLA proximity assay plus functional NER synthesis readout, single lab","pmids":["25483071"],"is_preprint":false},{"year":2015,"finding":"CUL4-DDB1-CDT2 E3 ligase ubiquitinates CRY1 and promotes its degradation in vitro and in vivo. Depletion of DDB1, CDT2, or PCNA leads to CRY1 stabilization in cultured cells and mouse liver. CUL4A-DDB1-CDT2 targets lysine 585 of CRY1, as the CRY1-K585A mutant is resistant to this ubiquitination/degradation. CDT2 depletion or CRY1-K585A overexpression enhances the amplitude of circadian Bmal1 promoter oscillations.","method":"In vitro ubiquitination assay; siRNA knockdown; CRY1-K585A mutagenesis; mouse liver experiments; luciferase circadian reporter assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination with site-specific mutagenesis and in vivo mouse validation plus functional circadian readout, single lab with multiple orthogonal methods","pmids":["26431207"],"is_preprint":false},{"year":2012,"finding":"ATR kinase phosphorylates CDT2 at S/TQ sites following UV irradiation, and this promotes rapid CDT1 degradation. CDT1 degradation is attenuated by caffeine and in ATR-depleted cells but not in ATM-depleted cells. ATR phosphorylates CDT2 in vitro, mostly in the C-terminal region.","method":"In vitro kinase assay; siRNA knockdown of ATR/ATM; caffeine inhibition; phosphorylation site mapping; Western blot","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay plus cellular validation with ATR-specific knockdown, single lab","pmids":["23029527"],"is_preprint":false},{"year":2018,"finding":"CDT2 bears a C-terminal PIP box (Cdt2PIP) that directly binds PCNA with two orders of magnitude higher affinity than the CDT1 PIP box. X-ray crystallographic structures of PCNA bound to Cdt2PIP and Cdt1PIP show peptides occupying all three binding sites of the trimeric PCNA ring. Mutating Cdt2PIP reduces PCNA interaction, impairs CRL4CDT2 ubiquitination of Cdt1, and leads to CDT1 degradation defects.","method":"X-ray crystallography; in vitro binding assays; site-directed mutagenesis of Cdt2PIP; in vitro ubiquitination assay; cellular CDT1 degradation assay","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis and functional ubiquitination assay, multiple orthogonal methods in one study","pmids":["30623174"],"is_preprint":false},{"year":2018,"finding":"CDT2 contains a conserved C-terminal PIP box-like region required for direct interaction with PCNA. Deletion or mutation of this region abolishes CDT2-PCNA interaction in vitro and in vivo and impairs PCNA-dependent CDT1 degradation in response to DNA damage and during the cell cycle.","method":"Recombinant protein expression; site-directed mutagenesis; Co-IP in vitro and in vivo; Western blot","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — recombinant protein mutagenesis with in vitro and cellular validation, single lab, consistent with PMID 30623174","pmids":["30301766"],"is_preprint":false},{"year":2018,"finding":"CDK-mediated phosphorylation of CDT2 (at multiple CDK consensus sites in the C-terminal region) inactivates CRL4(CDT2) by reducing CDT2 affinity for PCNA. Mutation of 18 CDK phosphorylation sites (Cdt2-18A) increases CDT2 affinity for PCNA, enhances co-localization with PCNA foci in S phase, increases poly-ubiquitination of CDT1, and prevents accumulation of Set8 and TDG in late S/G2 phase.","method":"In vitro phosphorylation assay (cyclinA/Cdk2, cyclinB/Cdk1); CDT2-18A mutagenesis; Co-IP; immunofluorescence; Western blot; cell synchronization","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — systematic phospho-site mutagenesis with in vitro kinase assay and multiple cellular functional readouts, single lab","pmids":["29424068"],"is_preprint":false},{"year":2018,"finding":"CRL4(DCAF2/CDT2) in dendritic cells regulates NIK stability by promoting NIK polyubiquitination and degradation independently of TRAF3 degradation. DCAF2 deficiency leads to NIK accumulation and RelB nuclear translocation, resulting in increased IL-23 production. DCAF2 DC-conditional knockout mice display increased sensitivity to autoimmune/psoriatic disease.","method":"Conditional knockout mice; DCAF2 depletion; Co-IP; in vivo ubiquitination assay; transcriptomic analysis; immunological assays","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout mouse model with in vivo ubiquitination and mechanistic pathway dissection, single lab but multiple orthogonal methods","pmids":["30018073"],"is_preprint":false},{"year":2018,"finding":"CRL4DCAF2 controls M phase exit in activated T cells. DCAF2 expression is induced upon TCR stimulation. Continuous H4K20me1 modification caused by DCAF2 deficiency inhibits Aurkb expression, which regulates 26S proteasome activity during G2/M phase, causing M phase arrest through proteasome-dependent mechanisms.","method":"T cell-specific conditional knockout mice; TCR stimulation assays; Western blot; H4K20me1 ChIP; proteasome activity assays; cell cycle analysis","journal":"Journal of autoimmunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockout model with mechanistic pathway placement through H4K20me1 and Aurora B, single lab","pmids":["30245026"],"is_preprint":false},{"year":2019,"finding":"DTL promotes ubiquitin-dependent degradation of the tumor suppressor PDCD4. DTL physically interacts with PDCD4 (confirmed by Co-IP and immunofluorescence), DTL overexpression accelerates PDCD4 degradation, and in vitro ubiquitination assays demonstrate PDCD4 is degraded through DTL-mediated ubiquitination.","method":"Affinity-purification mass spectrometry; Co-IP; immunofluorescence; in vitro ubiquitination assay; Western blot; rescue experiments","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro ubiquitination assay plus Co-IP and rescue experiment, single lab","pmids":["31409387"],"is_preprint":false},{"year":2019,"finding":"The C-terminal region of CDT2 contains a DNA-binding domain that enhances CRL4(CDT2) ubiquitin ligase activity. This domain binds double-stranded and single-stranded DNA. Deletion of this domain impairs UV-irradiation-induced CDT1 polyubiquitination and degradation. The N-terminal WD40 region is sufficient for CRL4 complex formation but not full ligase activity.","method":"Deletion and mutation analysis; DNA-binding assays; in vitro ubiquitination assay; cellular CDT1 degradation assay","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro DNA binding and ubiquitination assays with domain deletion analysis, single lab","pmids":["30649446"],"is_preprint":false},{"year":2021,"finding":"CRL4A-DTL ligase complex targets DNA-PKcs for nuclear degradation. Overexpression of CUL4A or DTL reduces NHEJ repair efficiency, increases DSB accumulation, and promotes genomic instability and malignant proliferation in normal cells. In human precancerous lesions, CUL4A expression is negatively correlated with DNA-PKcs.","method":"Co-IP; Western blot; NHEJ repair assay; overexpression in normal cells; xenograft; immunohistochemistry","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional NHEJ assay and cellular transformation phenotype, single lab","pmids":["33627782"],"is_preprint":false},{"year":2021,"finding":"DDB2 mediates ubiquitination and degradation of CDT2 in a PCNA-independent manner (PIP box of DDB2 is dispensable for CDT2 degradation). Knockdown of DDB2 stabilizes CDT2; overexpression of DDB2 enhances CDT2 ubiquitination and degradation. DDB2-mediated CDT2 degradation indirectly regulates CDT1 protein stability and pre-replication complex assembly.","method":"Co-IP; in vivo ubiquitination assay; siRNA knockdown; overexpression; PIP box mutagenesis; Western blot; FACS","journal":"Cell & bioscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ubiquitination with mutagenesis and functional DNA replication readout, single lab","pmids":["33557942"],"is_preprint":false},{"year":2017,"finding":"DCAF2 (DTL/CDT2) is a maternal factor essential for genome stability during the first zygotic cell cycle. Dcaf2 knockout in oocytes leads to female infertility; embryos derived from Dcaf2-null oocytes arrest at the 1-2 cell stage with prolonged DNA replication and massive DNA damage accumulation (rereplication).","method":"Oocyte-specific conditional knockout mice (Dcaf2fl/fl with Cre); embryo development analysis; DNA damage markers; Western blot","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout mouse model with defined first-cell-cycle phenotype and DNA re-replication mechanism","pmids":["28818995"],"is_preprint":false},{"year":2021,"finding":"CRL4(CDT2) ubiquitinates RUVBL1 (pontin/TIP49), promoting its binding to RUVBL2 and to transcription cofactor β-catenin while attenuating its binding to acetyltransferase TIP60. Ubiquitinated RUVBL1 promotes transcriptional regulation of NHEJ repair pathway genes via RUVBL1/2-β-catenin, attenuates TIP60-mediated H4K16 acetylation, and enhances radiation resistance in breast cancer cells.","method":"Co-IP; ubiquitination assay; Western blot; rescue experiments; in vitro and in vivo radioresistance assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with defined downstream transcriptional consequence, single lab","pmids":["38609375"],"is_preprint":false},{"year":2023,"finding":"DCAF14 controls CDT2 activity at stalled replication forks to protect nascent DNA. Absence of DCAF14 increases proteasomal degradation of CDT2 substrates (CDT1, p21, SET8). At stalled forks, increased CDT2 function causes fork collapse; this is dependent on CDT2 substrate SET8, which blocks nuclease-mediated digestion of nascent DNA.","method":"SiRNA knockdown; replication fork protection assay; Western blot; rescue experiments with SET8","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic rescue experiments with mechanistic pathway placement at replication forks, single lab","pmids":["37940188"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structures of the DCAF2:DDB1:DDA1 complex (3.3 Å), a ligand-bound complex (3.1 Å), and a ternary complex with a covalent PROTAC and BRD4 (3.4 Å) reveal PROTAC-mediated substrate recruitment to DCAF2. CDT2 residue C141 in the WD40 domain engages covalent ligands. DCAF2 demonstrates robust ubiquitination activity in biochemical assays upon covalent PROTAC engagement.","method":"Cryo-EM structure determination; in vitro ubiquitination assay; cellular TPD (COFFEE method); covalent compound engagement at C141","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure at near-atomic resolution combined with in vitro ubiquitination and cellular degradation validation, single lab but multiple orthogonal methods","pmids":["41045927"],"is_preprint":false},{"year":2025,"finding":"TRIM22 is a novel E3 ubiquitin ligase for CDT2 degradation. In HPV-positive cervical cancer cells, E7-mediated Rb degradation upregulates E2F1, which increases CDT2 transcription; E6-mediated p53 degradation downregulates TRIM22, leading to CDT2 accumulation. CDT2 depletion induces DNA aneuploidy and senescence via stabilization of SET8.","method":"Co-IP; Western blot; siRNA knockdown; chromatin immunoprecipitation; ubiquitination assays; cell senescence assays","journal":"Neoplasia (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay and functional senescence phenotype, single lab, mechanistic pathway defined","pmids":["40680432"],"is_preprint":false},{"year":2025,"finding":"Mdm2 promotes proteasomal degradation of CDT2 (independently of p53), thereby attenuating CRL4(CDT2) activity. Mdm2-mediated CDT2 degradation stabilizes p21, Set8, and CDT1 at the G2/M phase. Loss of Mdm2 causes G2/M delay and decreased proliferation largely through increased CDT2 and subsequent decreased p21 levels.","method":"SiRNA/overexpression experiments; Western blot; ubiquitination assays; cell cycle analysis","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 2 / Weak — preprint, single lab, mechanistic evidence from knockdown and overexpression but not yet peer-reviewed","pmids":["bio_10.1101_2025.07.09.663887"],"is_preprint":true},{"year":2024,"finding":"DCAF2 maintains proliferation and differentiation of progenitor spermatogonia by targeting p21 and thymine DNA glycosylase (TDG) for degradation during S phase. Germ cell-specific Dcaf2 knockout causes accumulation of p21 and TDG, reduced cell proliferation, increased DNA damage, apoptosis, failure of meiosis initiation, and male infertility.","method":"Germ cell-specific conditional knockout mice (Dcaf2fl/fl x Stra8-Cre); Western blot; immunofluorescence; overexpression of p21/TDG; apoptosis assays","journal":"Cell proliferation","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout model with substrate-specific rescue experiments and defined phenotype, multiple orthogonal methods","pmids":["38837535"],"is_preprint":false},{"year":2025,"finding":"DTL mediates K48-linked ubiquitination and proteasomal degradation of SMAD4 in pancreatic cancer cells. This activates the Wnt/β-catenin pathway to promote tumorigenesis. Knockdown of DTL suppresses tumor growth and metastasis in vivo.","method":"Co-IP; in vitro ubiquitination assay (K48 linkage); Western blot; siRNA knockdown; xenograft model","journal":"International journal of biological macromolecules","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro ubiquitination with K48 linkage specificity plus in vivo validation, single lab","pmids":["41203163"],"is_preprint":false},{"year":2024,"finding":"Under hypoxia, HIF-1α transcriptionally activates DTL expression. DTL then promotes ubiquitination and degradation of SLTM (SAFB-like transcription modulator), relieving transcriptional repression of Notch1 and activating the Notch pathway to promote HCC proliferation, metastasis, and sorafenib resistance.","method":"RNA-sequencing; Co-IP; ubiquitination assay; Western blot; ChIP; orthotopic tumor model; siRNA knockdown","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay and ChIP with in vivo tumor models, single lab","pmids":["39384740"],"is_preprint":false},{"year":2024,"finding":"DTL promotes K11-linked ubiquitination-mediated degradation of ARGLU1 in head and neck squamous cell carcinoma. This activates the CSL-dependent Notch signaling pathway. siARGLU1 blocks the inhibitory effects of DTL knockdown on HNSCC cells.","method":"Mass spectrometry; Co-IP; ubiquitination assay (K11 linkage); siRNA rescue experiments; in vivo tumor growth assay","journal":"International journal of biological macromolecules","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — K11-linked ubiquitination assay with MS identification and rescue experiment, single lab","pmids":["38218284"],"is_preprint":false},{"year":2025,"finding":"DTL ubiquitinates and degrades PROX1 in hepatocytes during ischemia/reperfusion injury. DTL-mediated PROX1 degradation increases polyunsaturated fatty acid (PUFA) levels, triggering ferroptosis and exacerbating hepatic I/R injury. Sex-specific differential DTL expression in mice determines sex disparity of I/R-induced ferroptosis.","method":"Multi-omics analysis; Co-IP; ubiquitination assay; Western blot; in vivo I/R mouse model; ferroptosis markers","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay with mechanistic downstream ferroptosis link, single lab","pmids":["40560731"],"is_preprint":false}],"current_model":"DTL (also known as CDT2/DCAF2/L2DTL) is the substrate-recognition adaptor of the CRL4(CDT2) E3 ubiquitin ligase complex, which couples ubiquitin-mediated proteolysis to DNA synthesis by directly binding PCNA loaded on DNA via a high-affinity C-terminal PIP box; substrates bearing a 'PIP degron' (TD residues in PIP box plus basic residues at +3/+4 positions) are ubiquitylated on chromatin and degraded in S phase or after DNA damage, with confirmed substrates including CDT1, p21, SET8/PR-Set7, E2F1, CHK1, XPG, FBH1, DNA polymerase δ p12 subunit, PCNA (monoubiquitination), CRY1, NIK, DNA-PKcs, PDCD4, SMAD4, SLTM, ARGLU1, and RUVBL1; CDT2 activity is regulated by CDK-mediated phosphorylation (reducing PCNA affinity), ATR phosphorylation (promoting substrate degradation after UV), SCF(FBXO11)-mediated degradation, 14-3-3 protein shielding, DDB2-mediated degradation, TRIM22-mediated degradation, and Mdm2-mediated degradation, making CRL4(CDT2) a master regulator of genome integrity, DNA replication licensing, checkpoint signaling, chromatin modification, and circadian clock amplitude."},"narrative":{"mechanistic_narrative":"DTL (CDT2/DCAF2/L2DTL) is the substrate-recognition subunit (DCAF) of the CUL4-DDB1 (CRL4) E3 ubiquitin ligase, which it converts into a PCNA-coupled proteolytic machine that links protein destruction to DNA synthesis [PMID:16949367, PMID:16861906]. CDT2 docks onto DNA-loaded PCNA through a C-terminal PIP box that binds PCNA with roughly two orders of magnitude higher affinity than canonical PIP boxes and occupies all three sites of the trimeric ring [PMID:30623174, PMID:30301766], and an adjacent C-terminal DNA-binding region further potentiates ligase activity [PMID:30649446]; substrates are recognized through a specialized 'PIP degron' that requires TD residues within the PIP box plus a basic residue at the +3/+4 position [PMID:21143559]. Through this mechanism CRL4(CDT2) ubiquitylates substrates on chromatin during S phase and after DNA damage to safeguard genome integrity: it destroys the licensing factor CDT1 to prevent rereplication [PMID:16949367, PMID:16861906, PMID:17085480], degrades the histone methyltransferase SET8/PR-Set7 to control H4K20me1 and chromatin compaction [PMID:20932472, PMID:21220508, PMID:21035370], and removes p21, the DNA polymerase delta p12 subunit, FBH1, XPG, and TDG to coordinate replication, translesion synthesis, and nucleotide excision repair, while also monoubiquitylating PCNA itself to promote TLS [PMID:20129063, PMID:21725088, PMID:23677613, PMID:23913683, PMID:25483071, PMID:38837535]. CRL4(CDT2) extends beyond replication to checkpoint control, degrading activated CHK1 in the nucleoplasm [PMID:23109433], and to the circadian clock, where it targets CRY1 to set Bmal1 oscillation amplitude [PMID:26431207]. CDT2 activity is itself tightly regulated: CDK phosphorylation of its C-terminus lowers PCNA affinity and inactivates the ligase [PMID:29424068], ATR phosphorylation after UV accelerates substrate degradation [PMID:23029527], and its abundance is controlled by multiple ligases and adaptors including SCF(FBXO11) opposed by 14-3-3 shielding of phospho-Thr464 [PMID:23478441, PMID:23478445, PMID:25154416], DDB2 [PMID:33557942], TRIM22 [PMID:40680432], and APC/C-Cdh1 in mitosis [PMID:17106265]. Genetic ablation establishes CDT2 as essential for genome stability in the early embryonic, oocyte, and spermatogonial cell cycles [PMID:17107960, PMID:28818995, PMID:38837535], and the protein is co-opted in cancer, where it degrades tumor suppressors such as PDCD4, SMAD4, SLTM, and ARGLU1 to drive proliferation, Notch and Wnt signaling, and therapy resistance [PMID:31409387, PMID:41203163, PMID:39384740, PMID:38218284]. Cryo-EM structures of the DCAF2:DDB1:DDA1 complex define how a covalent ligand engaging WD40 residue C141 enables PROTAC-mediated neosubstrate recruitment [PMID:41045927].","teleology":[{"year":2006,"claim":"Established the founding identity of DTL/CDT2 as a substrate receptor for the CUL4-DDB1 ligase that couples CDT1 destruction to ongoing DNA synthesis, explaining how cells avoid rereplication.","evidence":"DCAF identification by affinity-MS, Xenopus extract reconstitution, and siRNA knockdown in human cells with rereplication phenotype","pmids":["16949367","16861906","17085480"],"confidence":"High","gaps":["Did not resolve the structural basis of PCNA engagement","Mechanism of damage-induced versus S-phase recruitment not separated"]},{"year":2006,"claim":"Demonstrated CDT2 is genetically essential, with knockout causing early embryonic lethality and depletion causing mitotic catastrophe, showing the ligase is required for viable cell-cycle progression.","evidence":"Targeted gene disruption in mice, siRNA microinjection into embryos, and RNAi in HeLa cells","pmids":["17107960"],"confidence":"High","gaps":["Substrate(s) responsible for lethality not pinpointed in vivo","Did not distinguish replication-licensing from checkpoint contributions"]},{"year":2006,"claim":"Linked CDT2 to p53 pathway regulation by implicating CUL4A-CDT2-PCNA in MDM2 and p53 turnover, broadening its role beyond replication licensing.","evidence":"Co-IP and in vitro ubiquitination with siRNA knockdown","pmids":["16861890"],"confidence":"Medium","gaps":["Direct versus indirect effects on p53 not fully separated","Single lab"]},{"year":2008,"claim":"Characterized cell-cycle-dependent localization and identified Aurora kinase B phosphorylation controlling CDT2 stability, indicating mitotic regulation of the protein.","evidence":"Immunocytochemistry, in vitro AURKB kinase assay, and AURKB knockdown","pmids":["18542055","17106265"],"confidence":"Medium","gaps":["Functional consequence of contractile-ring/centrosome localization unresolved","Phosphosite mapping incomplete"]},{"year":2010,"claim":"Defined the molecular grammar of CRL4(CDT2) targeting—the PIP degron with TD residues and downstream basic residue—and showed it can convert a non-substrate into a substrate, providing a predictive substrate code.","evidence":"Chimera and mutagenesis of CDT1/Ligase I with cellular degradation assays","pmids":["21143559"],"confidence":"High","gaps":["Structural basis of degron-PCNA-CDT2 recognition not yet visualized","Did not address why some PIP proteins escape degradation"]},{"year":2010,"claim":"Expanded the substrate repertoire into chromatin and replication regulation by establishing PCNA-coupled degradation of SET8/PR-Set7 (controlling H4K20me1) and monoubiquitination of PCNA promoting translesion synthesis.","evidence":"PIP-degron mutagenesis, laser micro-irradiation, ChIP, in vitro ubiquitination, and TLS assays","pmids":["20932472","21035370","20129063","21220508"],"confidence":"High","gaps":["Relative S-phase versus damage contributions of each substrate not fully partitioned","PCNA monoubiquitination versus Rad18 pathway interplay incompletely defined"]},{"year":2011,"claim":"Showed CRL4(CDT2) function reaches checkpoint and transcriptional control by degrading activated CHK1 (in the nucleoplasm, PCNA-independent) and oscillatory destruction of E2F1, revealing context-dependent recruitment modes.","evidence":"Co-IP, compartment fractionation, knockdown in human cells, and Drosophila genetic epistasis with computational modeling","pmids":["23109433","22037307"],"confidence":"Medium","gaps":["PCNA-independent recruitment mechanism for CHK1 unresolved","E2F1 oscillator demonstrated in Drosophila endocycles, not human mitotic cycles"]},{"year":2011,"claim":"Connected CDT2 to mismatch repair and replication fidelity by linking alkylation-induced p21 degradation and Pol delta p12 turnover to chromatin repair-factor recruitment.","evidence":"PCNA-binding mutant analysis, chromatin fractionation, PIP-degron mutagenesis, and knockdown","pmids":["21725088","23913683"],"confidence":"Medium","gaps":["Direct ubiquitination of these substrates by CRL4(CDT2) inferred from cellular assays","Single lab for each substrate"]},{"year":2013,"claim":"Revealed how CDT2 abundance is itself controlled, with SCF(FBXO11) degrading CDT2 antagonistically to CDK phosphorylation at Thr464, defining cross-ligase regulation that times cell-cycle exit and TGF-beta responses.","evidence":"Affinity-MS, phospho-degron mutagenesis, in vitro ubiquitination, C. elegans epistasis, and signaling/migration assays","pmids":["23478441","23478445"],"confidence":"High","gaps":["Quantitative balance of autoubiquitylation versus FBXO11 in vivo not resolved","Tissue-specific relevance of CDT2 turnover unaddressed"]},{"year":2013,"claim":"Extended the DNA-damage substrate set to FBH1, showing degradation of this anti-recombinase helicase facilitates TLS polymerase eta recruitment after UV.","evidence":"Non-degradable FBH1 mutant, Co-IP, chromatin fractionation, and immunofluorescence","pmids":["23677613"],"confidence":"Medium","gaps":["Single lab","In vivo genome-stability consequence of FBH1 stabilization not measured"]},{"year":2014,"claim":"Identified 14-3-3 proteins as phospho-Thr464-dependent shields that protect CDT2 from FBXO11, adding a layer of stability control required for cell-cycle progression.","evidence":"Phospho-mimicking/blocking CDT2 mutants, Co-IP, ubiquitination assays, and cell-cycle analysis","pmids":["25154416"],"confidence":"Medium","gaps":["Which signals drive 14-3-3 binding dynamics not defined","Single lab"]},{"year":2015,"claim":"Broadened CRL4(CDT2) function into nucleotide excision repair completion and the circadian clock by degrading XPG after lesion incision and targeting CRY1 at Lys585 to set Bmal1 oscillation amplitude.","evidence":"Proximity ligation, NER synthesis assays, in vitro ubiquitination with K585A mutant, mouse liver, and luciferase circadian reporters","pmids":["25483071","26431207"],"confidence":"High","gaps":["PCNA dependence of CRY1 targeting in vivo not fully resolved","Tissue specificity of circadian role beyond liver untested"]},{"year":2018,"claim":"Provided the structural and biochemical basis for CDT2 substrate-targeting via its uniquely high-affinity C-terminal PIP box that occupies all three PCNA sites, and showed CDK phosphorylation inactivates the ligase by lowering PCNA affinity.","evidence":"X-ray crystallography of PCNA-PIP peptide complexes, binding assays, Cdt2PIP and 18-site CDK mutagenesis, and in vitro/cellular ubiquitination assays","pmids":["30623174","30301766","29424068"],"confidence":"High","gaps":["Full CRL4(CDT2)-substrate-PCNA-DNA assembly not visualized","How DNA loading is sensed structurally remains open"]},{"year":2018,"claim":"Established immune and developmental roles by showing DCAF2 degrades NIK in dendritic cells and controls M-phase exit in T cells via H4K20me1, linking the ligase to autoimmunity and lymphocyte proliferation.","evidence":"Conditional knockout mice, in vivo ubiquitination, H4K20me1 ChIP, proteasome activity, and immunological assays","pmids":["30018073","30245026"],"confidence":"High","gaps":["Whether NIK targeting is PCNA-coupled not addressed","M-phase H4K20me1-Aurkb axis mechanistic chain partly correlative"]},{"year":2019,"claim":"Defined a C-terminal DNA-binding domain that enhances ligase activity and showed the WD40 region alone supports complex formation but not full activity, refining the domain architecture of catalysis.","evidence":"Domain deletion, DNA-binding and in vitro ubiquitination assays, cellular CDT1 degradation","pmids":["30649446"],"confidence":"Medium","gaps":["Structural integration of DNA-binding domain with PIP box and PCNA unknown","Single lab"]},{"year":2021,"claim":"Expanded oncogenic substrate signaling—degrading DNA-PKcs to impair NHEJ and ubiquitinating RUVBL1 to reroute chromatin and transcriptional programs—linking CDT2 dysregulation to genomic instability and radioresistance.","evidence":"Co-IP, ubiquitination and NHEJ repair assays, xenografts, and immunohistochemistry","pmids":["33627782","38609375"],"confidence":"Medium","gaps":["PCNA/degron dependence of these substrates not established","Single lab per substrate"]},{"year":2021,"claim":"Added DDB2 as an additional regulator that degrades CDT2 PCNA-independently, indirectly tuning CDT1 stability and pre-replication complex assembly.","evidence":"In vivo ubiquitination, PIP-box mutagenesis, knockdown/overexpression, and FACS","pmids":["33557942"],"confidence":"Medium","gaps":["Physiological context where DDB2 dominates CDT2 turnover unclear","Single lab"]},{"year":2023,"claim":"Showed CDT2 activity must be restrained at stalled replication forks, with DCAF14 limiting CDT2-driven SET8 loss to prevent nuclease-mediated nascent DNA degradation and fork collapse.","evidence":"siRNA knockdown, fork protection assays, and SET8 rescue experiments","pmids":["37940188"],"confidence":"Medium","gaps":["Mechanism by which DCAF14 modulates CDT2 not defined","Single lab"]},{"year":2024,"claim":"Demonstrated germline-specific requirements for CDT2 in maintaining spermatogonial proliferation and meiotic entry through degradation of p21 and TDG, paralleling its essential maternal role.","evidence":"Germ cell-specific conditional knockout mice with substrate rescue and apoptosis assays","pmids":["38837535","28818995"],"confidence":"High","gaps":["Relative contribution of p21 versus TDG in vivo not fully partitioned","Whether other substrates contribute to phenotype untested"]},{"year":2024,"claim":"Established DTL as an oncogenic driver in solid tumors through novel-linkage ubiquitination of SMAD4 (K48), SLTM, and ARGLU1 (K11) to activate Wnt and Notch signaling, broadening its substrate landscape into developmental signaling.","evidence":"MS, Co-IP, linkage-specific ubiquitination assays, ChIP, rescue, and in vivo tumor models","pmids":["41203163","39384740","38218284"],"confidence":"Medium","gaps":["PCNA/degron requirements for these substrates not tested","Single lab per substrate"]},{"year":2025,"claim":"Provided cryo-EM structures of the DCAF2:DDB1:DDA1 complex and a PROTAC ternary complex with BRD4, identifying WD40 residue C141 as a covalent handle for targeted protein degradation, establishing CDT2 as a druggable ligase scaffold.","evidence":"Cryo-EM structure determination, in vitro ubiquitination, and cellular TPD assays with covalent compounds","pmids":["41045927"],"confidence":"High","gaps":["Structure of an endogenous-substrate ternary complex not solved","Selectivity of C141-targeting ligands in cells incompletely characterized"]},{"year":2025,"claim":"Identified additional upstream ligases—TRIM22 (downregulated by HPV E6) and Mdm2—that control CDT2 abundance, linking CDT2 dysregulation to viral oncogenesis and senescence via SET8/p21 stabilization.","evidence":"Co-IP, ubiquitination assays, ChIP, knockdown/overexpression, and senescence assays (one preprint)","pmids":["40680432","bio_10.1101_2025.07.09.663887"],"confidence":"Medium","gaps":["Mdm2 finding is a non-peer-reviewed preprint awaiting validation","Hierarchy among the multiple CDT2-degrading ligases in different contexts unresolved"]},{"year":2025,"claim":"Extended CDT2 substrate biology to ferroptosis and tissue injury through PROX1 degradation in hepatocytes during ischemia/reperfusion, with sex-dependent expression governing injury severity.","evidence":"Multi-omics, Co-IP, ubiquitination assays, and in vivo I/R mouse models with ferroptosis markers","pmids":["40560731"],"confidence":"Medium","gaps":["Whether PROX1 degradation is PCNA-coupled unaddressed","Single lab"]},{"year":null,"claim":"It remains unresolved how the full CRL4(CDT2) holoenzyme engages a PIP-degron substrate on DNA-loaded PCNA at atomic resolution, and how the many competing CDT2-degrading ligases are coordinated to set ligase activity in distinct tissues and disease states.","evidence":"Open question synthesized from current structural and regulatory gaps in the timeline","pmids":[],"confidence":"Low","gaps":["No structure of an endogenous substrate-PCNA-CRL4(CDT2) ternary complex","Quantitative integration of FBXO11, DDB2, TRIM22, Mdm2, and APC/C control of CDT2 levels lacking","Substrate-selectivity rules across tissues not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,8,20,22,38]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,7,13,22]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,13,22]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[28]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[24,21]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5,11]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[7,9,0]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[11]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,3,10,24]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[16,19,29,8]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[0,3,17,33]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,22,34]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[7,9,26]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[20]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[25,26]}],"complexes":["CRL4(CDT2) / CUL4-DDB1-CDT2 E3 ubiquitin ligase"],"partners":["DDB1","CUL4A","PCNA","CDT1","DDA1","FBXO11","DDB2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NZJ0","full_name":"Denticleless protein homolog","aliases":["DDB1- and CUL4-associated factor 2","Lethal(2) denticleless protein homolog","Retinoic acid-regulated nuclear matrix-associated protein"],"length_aa":730,"mass_kda":79.5,"function":"Substrate-specific adapter of a DCX (DDB1-CUL4-X-box) E3 ubiquitin-protein ligase complex required for cell cycle control, DNA damage response and translesion DNA synthesis. The DCX(DTL) complex, also named CRL4(CDT2) complex, mediates the polyubiquitination and subsequent degradation of CDT1, CDKN1A/p21(CIP1), FBH1, KMT5A and SDE2 (PubMed:16861906, PubMed:16949367, PubMed:16964240, PubMed:17085480, PubMed:18703516, PubMed:18794347, PubMed:18794348, PubMed:19332548, PubMed:20129063, PubMed:23478441, PubMed:23478445, PubMed:23677613, PubMed:27906959). CDT1 degradation in response to DNA damage is necessary to ensure proper cell cycle regulation of DNA replication (PubMed:16861906, PubMed:16949367, PubMed:17085480). CDKN1A/p21(CIP1) degradation during S phase or following UV irradiation is essential to control replication licensing (PubMed:18794348, PubMed:19332548). KMT5A degradation is also important for a proper regulation of mechanisms such as TGF-beta signaling, cell cycle progression, DNA repair and cell migration (PubMed:23478445). Most substrates require their interaction with PCNA for their polyubiquitination: substrates interact with PCNA via their PIP-box, and those containing the 'K+4' motif in the PIP box, recruit the DCX(DTL) complex, leading to their degradation. In undamaged proliferating cells, the DCX(DTL) complex also promotes the 'Lys-164' monoubiquitination of PCNA, thereby being involved in PCNA-dependent translesion DNA synthesis (PubMed:20129063, PubMed:23478441, PubMed:23478445, PubMed:23677613). The DDB1-CUL4A-DTL E3 ligase complex regulates the circadian clock function by mediating the ubiquitination and degradation of CRY1 (PubMed:26431207)","subcellular_location":"Nucleus; Nucleus membrane; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q9NZJ0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/DTL","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DDB1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/DTL","total_profiled":1310},"omim":[{"mim_id":"620743","title":"SDE2 TELOMERE MAINTENANCE HOMOLOG; SDE2","url":"https://www.omim.org/entry/620743"},{"mim_id":"611313","title":"ARMS2 GENE; ARMS2","url":"https://www.omim.org/entry/611313"},{"mim_id":"610617","title":"DENTICLELESS E3 UBIQUITIN PROTEIN LIGASE HOMOLOG; DTL","url":"https://www.omim.org/entry/610617"},{"mim_id":"610149","title":"MACULAR DEGENERATION, AGE-RELATED, 7; ARMD7","url":"https://www.omim.org/entry/610149"},{"mim_id":"609012","title":"WD REPEAT-CONTAINING PROTEIN 5; WDR5","url":"https://www.omim.org/entry/609012"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":13.8},{"tissue":"intestine","ntpm":4.5},{"tissue":"lymphoid tissue","ntpm":13.2},{"tissue":"placenta","ntpm":3.7},{"tissue":"testis","ntpm":12.8}],"url":"https://www.proteinatlas.org/search/DTL"},"hgnc":{"alias_symbol":["RAMP","L2DTL","DCAF2","CDT2"],"prev_symbol":[]},"alphafold":{"accession":"Q9NZJ0","domains":[{"cath_id":"2.130.10.10","chopping":"39-193_213-412","consensus_level":"medium","plddt":90.1347,"start":39,"end":412}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZJ0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZJ0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZJ0-F1-predicted_aligned_error_v6.png","plddt_mean":62.78},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DTL","jax_strain_url":"https://www.jax.org/strain/search?query=DTL"},"sequence":{"accession":"Q9NZJ0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NZJ0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NZJ0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZJ0"}},"corpus_meta":[{"pmid":"16949367","id":"PMC_16949367","title":"A family of diverse Cul4-Ddb1-interacting proteins includes Cdt2, which is required for S phase destruction of the replication factor Cdt1.","date":"2006","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/16949367","citation_count":540,"is_preprint":false},{"pmid":"21035370","id":"PMC_21035370","title":"Regulation of the histone H4 monomethylase PR-Set7 by CRL4(Cdt2)-mediated PCNA-dependent degradation during DNA damage.","date":"2010","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/21035370","citation_count":204,"is_preprint":false},{"pmid":"21828267","id":"PMC_21828267","title":"Mechanism of CRL4(Cdt2), a PCNA-dependent E3 ubiquitin ligase.","date":"2011","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/21828267","citation_count":195,"is_preprint":false},{"pmid":"20932472","id":"PMC_20932472","title":"CRL4(Cdt2)-mediated destruction of the histone methyltransferase Set8 prevents premature chromatin compaction in S 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development","url":"https://pubmed.ncbi.nlm.nih.gov/17085480","citation_count":141,"is_preprint":false},{"pmid":"20129063","id":"PMC_20129063","title":"CRL4(Cdt2) E3 ubiquitin ligase monoubiquitinates PCNA to promote translesion DNA synthesis.","date":"2010","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/20129063","citation_count":140,"is_preprint":false},{"pmid":"22037307","id":"PMC_22037307","title":"Control of Drosophila endocycles by E2F and CRL4(CDT2).","date":"2011","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/22037307","citation_count":130,"is_preprint":false},{"pmid":"16861890","id":"PMC_16861890","title":"L2DTL/CDT2 and PCNA interact with p53 and regulate p53 polyubiquitination and protein stability through MDM2 and CUL4A/DDB1 complexes.","date":"2006","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/16861890","citation_count":114,"is_preprint":false},{"pmid":"21220508","id":"PMC_21220508","title":"SET8 is degraded 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phase","date":"2025-07-12","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.09.663887","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.09.29.679165","title":"Mapping the miRNA Landscape of Gallbladder Cancer: Genome-Wide Insights and Functional Implications","date":"2025-09-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.29.679165","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.03.646975","title":"REvolutionH-tl: A Fast and Robust Tool for Decoding Evolutionary Gene Histories","date":"2025-04-08","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.03.646975","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.08.08.24311683","title":"Novel Large Empirical Study of Deep Transfer Learning for COVID-19 Classification Based on CT and X-Ray Images","date":"2024-08-09","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.08.24311683","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.07.25320118","title":"Declines in HIV Incidence and Prevalence and Predictors Among Adolescents and Young Adults: An Observational Cohort Study, Rakai, Uganda, 2005-2020","date":"2025-01-07","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.07.25320118","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51356,"output_tokens":10986,"usd":0.159429,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":21828,"output_tokens":7464,"usd":0.14787,"stage2_stop_reason":"end_turn"},"total_usd":0.307299,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"DTL/CDT2/DCAF2 is a substrate receptor (DCAF) for the CUL4-DDB1 E3 ubiquitin ligase complex. It is recruited to replication forks via CDT1 and PCNA, where it ubiquitylates CDT1 to promote its destruction in S phase and after DNA damage, preventing rereplication. Depletion of human CDT2 causes rereplication and checkpoint activation.\",\n      \"method\": \"Affinity purification/mass spectrometry identification of DCAFs; Xenopus egg extract depletion/reconstitution assays; siRNA knockdown in human cells; Co-IP; cell cycle analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution in Xenopus extracts plus human cell knockdown with defined phenotype, multiple orthogonal methods, replicated across labs\",\n      \"pmids\": [\"16949367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"L2DTL/CDT2 associates with CUL4, DDB1, and PCNA in human cells, and loss of L2DTL suppresses CDT1 proteolysis in response to DNA damage. PCNA interacts with CDT1 and is required for CDT1 proteolysis after DNA damage. Inactivation of L2DTL causes dissociation of DDB1 from the CUL4 complex.\",\n      \"method\": \"Anti-CUL4 antibody affinity chromatography/mass spectrometry; anti-L2DTL immunoaffinity chromatography; Co-IP; siRNA knockdown in Drosophila S2 and human cells; Western blot\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal affinity purification, Co-IP, and functional knockdown with defined substrate phenotype, replicated in two cell systems\",\n      \"pmids\": [\"16861906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"L2DTL/CDT2 and PCNA physically interact with p53 and MDM2/HDM2. CUL4A complexes display polyubiquitination activity towards p53 dependent on L2DTL, PCNA, DDB1, ROC1, and MDM2. Inactivation of CUL4A, L2DTL, PCNA, DDB1, or ROC1 induces p53 stabilization and growth arrest. MDM2 is rapidly proteolyzed after UV irradiation through a CUL4/DDB1- and PCNA-regulated mechanism.\",\n      \"method\": \"Co-IP; in vitro ubiquitination assay; siRNA knockdown; Western blot\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro ubiquitination assay with Co-IP, single lab, multiple substrates tested\",\n      \"pmids\": [\"16861890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DTL/CDT2 is an essential component of the CUL4-DDB1 E3 ubiquitin ligase that controls CDT1 levels, preventing rereplication. DTL is also required for the early radiation-induced G2/M checkpoint independently of CDT1. In zebrafish, reduction of Cdt1 suppresses the rereplication defect of dtl/cdt2-deficient fish but not the G2/M checkpoint defect, establishing two distinct mechanistic roles.\",\n      \"method\": \"Zebrafish forward genetic screen; genetic epistasis (cdt1 reduction in dtl mutants); human DTL siRNA knockdown; cell cycle analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in zebrafish plus human cell knockdown with two distinct phenotypic readouts, cross-species validation\",\n      \"pmids\": [\"17085480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"L2dtl gene knockout in mice results in early embryonic lethality at the 4-8 cell stage. siRNA-mediated depletion of L2dtl in mouse embryos causes cell cycle progression failure, mitotic catastrophe (chromosomal fragmentation and lagging), and failure to develop to blastocysts. In HeLa cells, L2dtl depletion results in multinucleation and downregulation of PCNA and PTTG1/securin.\",\n      \"method\": \"Targeted gene disruption in mice; microinjection of siRNA into two-cell embryos; RNAi in HeLa cells; morphological analysis; Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse model and siRNA knockdown with defined embryonic and cellular phenotypes, multiple methods\",\n      \"pmids\": [\"17107960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"L2DTL protein localizes to the nucleus during interphase and concentrates at centrosomes (co-localizing with gamma-tubulin and Aurora-A) throughout the cell cycle. L2DTL protein is degraded in mitosis by the APC/C-Cdh1 complex. L2DTL gene expression peaks at G1/S phase.\",\n      \"method\": \"Immunostaining; Western blotting; centrosome isolation/co-fractionation with gamma-tubulin; cell cycle synchronization\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by immunostaining plus biochemical fractionation and APC/C-Cdh1 degradation identification, single lab\",\n      \"pmids\": [\"17106265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DTL/RAMP protein shows cell-cycle-dependent localization in breast cancer cells: nuclear during interphase and concentrated at the contractile ring during cytokinesis. DTL/RAMP is phosphorylated by Aurora kinase B (AURKB) in vitro. Depletion of AURKB reduces DTL/RAMP phosphorylation and decreases DTL/RAMP protein stability.\",\n      \"method\": \"Immunocytochemistry; Western blot; in vitro kinase assay with AURKB; siRNA knockdown of AURKB; cell cycle analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay plus cellular localization and protein stability experiments, single lab\",\n      \"pmids\": [\"18542055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CRL4(CDT2) ubiquitylates and destroys the histone methyltransferase Set8/PR-Set7 during S phase and after DNA damage. Set8 ubiquitylation occurs on chromatin and requires a specific PIP degron in Set8 that binds PCNA. Inactivation of CRL4(CDT2) leads to Set8 stabilization, aberrant H4K20me1 accumulation, premature chromatin compaction, and checkpoint-mediated G2 arrest.\",\n      \"method\": \"siRNA knockdown; overexpression of Set8 PIP-degron mutant; cell cycle analysis; H4K20me1 chromatin immunoprecipitation; Western blot\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — degron mutagenesis plus cellular phenotype with mechanistic readout, replicated by independent lab (PMID 21220508)\",\n      \"pmids\": [\"20932472\", \"21220508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CRL4(CDT2) E3 ubiquitin ligase monoubiquitinates PCNA at Lys164 independently of Rad18 in proliferating cells. This is antagonized by USP1. CRL4(CDT2)-mediated PCNA monoubiquitination promotes translesion DNA synthesis (TLS) in nondamaged cells.\",\n      \"method\": \"In vitro ubiquitination assay; siRNA knockdown of CRL4(CDT2) components; PCNA Lys164 mutagenesis; TLS assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination with site-specific mutagenesis plus cellular TLS functional assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"20129063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PR-Set7 is degraded during S phase and after DNA damage via PCNA-coupled CRL4(CDT2)-dependent proteolysis. PR-Set7 interaction with PCNA through a specialized 'PIP degron' domain targets it for this degradation. PR-Set7 is transiently recruited to laser-induced DNA damage sites through its interaction with PCNA, and 53BP1 recruitment to damage sites depends on PR-Set7 catalytic activity.\",\n      \"method\": \"Western blot; PIP degron mutagenesis; laser micro-irradiation live imaging; siRNA knockdown; cell cycle analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — PIP degron mutagenesis plus live imaging and functional assay, replicated independently (PMID 20932472, 21220508)\",\n      \"pmids\": [\"21035370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In Drosophila endocycles, S-phase activates the CRL4(CDT2) ubiquitin ligase, which mediates destruction of E2F1 transcription factor. This creates a molecular oscillator: E2F1 promotes CycE expression and S-phase initiation, S-phase activates CRL4(CDT2), which destroys E2F1, allowing low CDK activity needed for pre-RC formation for the next S-phase.\",\n      \"method\": \"Genetic epistasis in Drosophila; computational modeling; overexpression/stabilized E2F1 mutant analysis; genetic tests\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis combined with computational modeling and multiple genetic tests in Drosophila\",\n      \"pmids\": [\"22037307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CRL4(CDT2) targets CHK1 for ubiquitin-mediated destruction in the nucleoplasm (not on chromatin) in a PCNA-independent manner, targeting the activated form of CHK1. CDT2-depleted cells show G2 arrest, and CHK1 activity is required for maintaining this G2 arrest. CRL1 and CRL4 both ubiquitinate CHK1 but bind CHK1 in distinct cellular compartments.\",\n      \"method\": \"Co-IP; siRNA knockdown; Western blot; cell cycle analysis; compartment fractionation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional knockdown with compartment fractionation, single lab\",\n      \"pmids\": [\"23109433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MNNG-induced DNA alkylation triggers rapid p21 degradation via the ubiquitin ligase CDT2 and the proteasome. This degradation requires MSH2 but not MLH1, and requires p21's ability to bind PCNA. MNNG induces formation of PCNA complexes with MSH6 and CDT2. When p21 degradation is blocked, MMR protein recruitment to chromatin is reduced.\",\n      \"method\": \"SiRNA knockdown; Western blot; p21 PCNA-binding mutant analysis; chromatin fractionation; PCNA Co-IP\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic perturbations with mechanistic mutant analysis, single lab\",\n      \"pmids\": [\"21725088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CRL4(CDT2)-mediated substrate degradation requires two elements in the substrate PIP box: TD amino acid residues within the PIP box and a basic amino acid at +4 (and +3) downstream of the PIP box. An acidic amino acid following these basic residues abolishes degradation. Introducing all required elements into ligase I peptide renders it degradable.\",\n      \"method\": \"Chimera constructs of CDT1 and Ligase I; mutagenesis; degradation assays in HeLa cells; electrostatic surface analysis\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis with reconstitution of degron in non-substrate, defining structural requirements, single lab\",\n      \"pmids\": [\"21143559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SCF(FBXO11)/CRL1 interacts with CDT2 and recruits it for proteasomal degradation, thereby restraining CRL4(CDT2) activity. CDK-mediated phosphorylation of CDT2 at Thr464 inhibits recognition by FBXO11. This cross-regulation between SCF(FBXO11) and CRL4(CDT2) is evolutionarily conserved from worms to humans and regulates timing of cell-cycle exit.\",\n      \"method\": \"Affinity purification/mass spectrometry; Co-IP; CDT2 Thr464 mutagenesis; degradation assays; C. elegans epistasis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — phospho-degron mutagenesis, MS-based interaction discovery, cross-species conservation, two independent labs reporting simultaneously (PMID 23478441 and 23478445)\",\n      \"pmids\": [\"23478441\", \"23478445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CDT2 undergoes autoubiquitylation by CRL4A E3 ubiquitin ligase, and is additionally polyubiquitylated and degraded by CRL1(FBXO11). CRL1(FBXO11)-mediated degradation of CDT2 stabilizes p21 and Set8, which is important during TGF-β response—Set8 induction turns off Smad2 activation. CDT2 downregulation via CRL1(FBXO11) also stimulates epithelial cell migration.\",\n      \"method\": \"Co-IP; in vitro ubiquitination assay; siRNA knockdown; TGF-β signaling assays; cell migration assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro ubiquitination plus defined downstream signaling consequence, two labs reporting simultaneously\",\n      \"pmids\": [\"23478445\", \"23478441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CRL4(CDT2) promotes degradation of the DNA repair helicase FBH1 after DNA damage in a PCNA- and PIP-degron-dependent manner. FBH1's anti-recombinase activity is partially dependent on its interaction with PCNA. Degradation of FBH1 by CDT2-proteasome pathway facilitates TLS polymerase eta recruitment to chromatin in UV-irradiated cells.\",\n      \"method\": \"SiRNA knockdown; non-degradable FBH1 mutant expression; Co-IP; immunofluorescence; chromatin fractionation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — non-degradable mutant plus functional TLS polymerase recruitment assay, single lab\",\n      \"pmids\": [\"23677613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CRL4(CDT2) regulates the subunit composition of DNA polymerase delta (Pol δ) by targeting the p12 subunit for degradation in response to DNA damage and during S phase entry. The p12 subunit possesses a PIP-degron. Knockdown of CUL4A or CUL4B inhibits p12 degradation. Mutation of the p12 PIP-degron prevents its S phase reduction.\",\n      \"method\": \"SiRNA knockdown; PIP-degron mutagenesis; laser scanning cytometry; Western blot; cell synchronization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PIP-degron mutagenesis with cellular degradation assay and synchronization, single lab\",\n      \"pmids\": [\"23913683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"14-3-3 adaptor proteins interact with CDT2 phosphorylated at Thr464 and shield CDT2 from polyubiquitination and proteasomal degradation by FbxO11. Depletion of 14-3-3 proteins promotes FbxO11–CDT2 interaction. The stabilization of CDT2 by 14-3-3 proteins is important for cell cycle progression; depletion of 14-3-3γ leads to G2/M delay partly due to Set8 accumulation.\",\n      \"method\": \"Co-IP; phospho-mimicking/blocking CDT2 mutations (T464D/T464A); siRNA knockdown; ubiquitination assay; cell cycle analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-mimicking mutagenesis plus Co-IP and functional cell cycle readout, single lab\",\n      \"pmids\": [\"25154416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CRL4(CDT2) promotes degradation of XPG endonuclease after its action on bulky DNA lesions (UV, cisplatin) during nucleotide excision repair. CDT2 is recruited to UV-damage sites and interacts with XPG in the presence of PCNA. CDT2-mediated XPG degradation is required for subsequent DNA polymerase delta recruitment and gap-filling DNA synthesis (completion of NER).\",\n      \"method\": \"SiRNA knockdown; micropore UV irradiation; in situ Proximity Ligation Assay; immunofluorescence; DNA repair synthesis assay\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PLA proximity assay plus functional NER synthesis readout, single lab\",\n      \"pmids\": [\"25483071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CUL4-DDB1-CDT2 E3 ligase ubiquitinates CRY1 and promotes its degradation in vitro and in vivo. Depletion of DDB1, CDT2, or PCNA leads to CRY1 stabilization in cultured cells and mouse liver. CUL4A-DDB1-CDT2 targets lysine 585 of CRY1, as the CRY1-K585A mutant is resistant to this ubiquitination/degradation. CDT2 depletion or CRY1-K585A overexpression enhances the amplitude of circadian Bmal1 promoter oscillations.\",\n      \"method\": \"In vitro ubiquitination assay; siRNA knockdown; CRY1-K585A mutagenesis; mouse liver experiments; luciferase circadian reporter assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination with site-specific mutagenesis and in vivo mouse validation plus functional circadian readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"26431207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ATR kinase phosphorylates CDT2 at S/TQ sites following UV irradiation, and this promotes rapid CDT1 degradation. CDT1 degradation is attenuated by caffeine and in ATR-depleted cells but not in ATM-depleted cells. ATR phosphorylates CDT2 in vitro, mostly in the C-terminal region.\",\n      \"method\": \"In vitro kinase assay; siRNA knockdown of ATR/ATM; caffeine inhibition; phosphorylation site mapping; Western blot\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay plus cellular validation with ATR-specific knockdown, single lab\",\n      \"pmids\": [\"23029527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CDT2 bears a C-terminal PIP box (Cdt2PIP) that directly binds PCNA with two orders of magnitude higher affinity than the CDT1 PIP box. X-ray crystallographic structures of PCNA bound to Cdt2PIP and Cdt1PIP show peptides occupying all three binding sites of the trimeric PCNA ring. Mutating Cdt2PIP reduces PCNA interaction, impairs CRL4CDT2 ubiquitination of Cdt1, and leads to CDT1 degradation defects.\",\n      \"method\": \"X-ray crystallography; in vitro binding assays; site-directed mutagenesis of Cdt2PIP; in vitro ubiquitination assay; cellular CDT1 degradation assay\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis and functional ubiquitination assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"30623174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CDT2 contains a conserved C-terminal PIP box-like region required for direct interaction with PCNA. Deletion or mutation of this region abolishes CDT2-PCNA interaction in vitro and in vivo and impairs PCNA-dependent CDT1 degradation in response to DNA damage and during the cell cycle.\",\n      \"method\": \"Recombinant protein expression; site-directed mutagenesis; Co-IP in vitro and in vivo; Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — recombinant protein mutagenesis with in vitro and cellular validation, single lab, consistent with PMID 30623174\",\n      \"pmids\": [\"30301766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CDK-mediated phosphorylation of CDT2 (at multiple CDK consensus sites in the C-terminal region) inactivates CRL4(CDT2) by reducing CDT2 affinity for PCNA. Mutation of 18 CDK phosphorylation sites (Cdt2-18A) increases CDT2 affinity for PCNA, enhances co-localization with PCNA foci in S phase, increases poly-ubiquitination of CDT1, and prevents accumulation of Set8 and TDG in late S/G2 phase.\",\n      \"method\": \"In vitro phosphorylation assay (cyclinA/Cdk2, cyclinB/Cdk1); CDT2-18A mutagenesis; Co-IP; immunofluorescence; Western blot; cell synchronization\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — systematic phospho-site mutagenesis with in vitro kinase assay and multiple cellular functional readouts, single lab\",\n      \"pmids\": [\"29424068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRL4(DCAF2/CDT2) in dendritic cells regulates NIK stability by promoting NIK polyubiquitination and degradation independently of TRAF3 degradation. DCAF2 deficiency leads to NIK accumulation and RelB nuclear translocation, resulting in increased IL-23 production. DCAF2 DC-conditional knockout mice display increased sensitivity to autoimmune/psoriatic disease.\",\n      \"method\": \"Conditional knockout mice; DCAF2 depletion; Co-IP; in vivo ubiquitination assay; transcriptomic analysis; immunological assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout mouse model with in vivo ubiquitination and mechanistic pathway dissection, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"30018073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRL4DCAF2 controls M phase exit in activated T cells. DCAF2 expression is induced upon TCR stimulation. Continuous H4K20me1 modification caused by DCAF2 deficiency inhibits Aurkb expression, which regulates 26S proteasome activity during G2/M phase, causing M phase arrest through proteasome-dependent mechanisms.\",\n      \"method\": \"T cell-specific conditional knockout mice; TCR stimulation assays; Western blot; H4K20me1 ChIP; proteasome activity assays; cell cycle analysis\",\n      \"journal\": \"Journal of autoimmunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockout model with mechanistic pathway placement through H4K20me1 and Aurora B, single lab\",\n      \"pmids\": [\"30245026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DTL promotes ubiquitin-dependent degradation of the tumor suppressor PDCD4. DTL physically interacts with PDCD4 (confirmed by Co-IP and immunofluorescence), DTL overexpression accelerates PDCD4 degradation, and in vitro ubiquitination assays demonstrate PDCD4 is degraded through DTL-mediated ubiquitination.\",\n      \"method\": \"Affinity-purification mass spectrometry; Co-IP; immunofluorescence; in vitro ubiquitination assay; Western blot; rescue experiments\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro ubiquitination assay plus Co-IP and rescue experiment, single lab\",\n      \"pmids\": [\"31409387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The C-terminal region of CDT2 contains a DNA-binding domain that enhances CRL4(CDT2) ubiquitin ligase activity. This domain binds double-stranded and single-stranded DNA. Deletion of this domain impairs UV-irradiation-induced CDT1 polyubiquitination and degradation. The N-terminal WD40 region is sufficient for CRL4 complex formation but not full ligase activity.\",\n      \"method\": \"Deletion and mutation analysis; DNA-binding assays; in vitro ubiquitination assay; cellular CDT1 degradation assay\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro DNA binding and ubiquitination assays with domain deletion analysis, single lab\",\n      \"pmids\": [\"30649446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRL4A-DTL ligase complex targets DNA-PKcs for nuclear degradation. Overexpression of CUL4A or DTL reduces NHEJ repair efficiency, increases DSB accumulation, and promotes genomic instability and malignant proliferation in normal cells. In human precancerous lesions, CUL4A expression is negatively correlated with DNA-PKcs.\",\n      \"method\": \"Co-IP; Western blot; NHEJ repair assay; overexpression in normal cells; xenograft; immunohistochemistry\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional NHEJ assay and cellular transformation phenotype, single lab\",\n      \"pmids\": [\"33627782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DDB2 mediates ubiquitination and degradation of CDT2 in a PCNA-independent manner (PIP box of DDB2 is dispensable for CDT2 degradation). Knockdown of DDB2 stabilizes CDT2; overexpression of DDB2 enhances CDT2 ubiquitination and degradation. DDB2-mediated CDT2 degradation indirectly regulates CDT1 protein stability and pre-replication complex assembly.\",\n      \"method\": \"Co-IP; in vivo ubiquitination assay; siRNA knockdown; overexpression; PIP box mutagenesis; Western blot; FACS\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ubiquitination with mutagenesis and functional DNA replication readout, single lab\",\n      \"pmids\": [\"33557942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DCAF2 (DTL/CDT2) is a maternal factor essential for genome stability during the first zygotic cell cycle. Dcaf2 knockout in oocytes leads to female infertility; embryos derived from Dcaf2-null oocytes arrest at the 1-2 cell stage with prolonged DNA replication and massive DNA damage accumulation (rereplication).\",\n      \"method\": \"Oocyte-specific conditional knockout mice (Dcaf2fl/fl with Cre); embryo development analysis; DNA damage markers; Western blot\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout mouse model with defined first-cell-cycle phenotype and DNA re-replication mechanism\",\n      \"pmids\": [\"28818995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRL4(CDT2) ubiquitinates RUVBL1 (pontin/TIP49), promoting its binding to RUVBL2 and to transcription cofactor β-catenin while attenuating its binding to acetyltransferase TIP60. Ubiquitinated RUVBL1 promotes transcriptional regulation of NHEJ repair pathway genes via RUVBL1/2-β-catenin, attenuates TIP60-mediated H4K16 acetylation, and enhances radiation resistance in breast cancer cells.\",\n      \"method\": \"Co-IP; ubiquitination assay; Western blot; rescue experiments; in vitro and in vivo radioresistance assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with defined downstream transcriptional consequence, single lab\",\n      \"pmids\": [\"38609375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DCAF14 controls CDT2 activity at stalled replication forks to protect nascent DNA. Absence of DCAF14 increases proteasomal degradation of CDT2 substrates (CDT1, p21, SET8). At stalled forks, increased CDT2 function causes fork collapse; this is dependent on CDT2 substrate SET8, which blocks nuclease-mediated digestion of nascent DNA.\",\n      \"method\": \"SiRNA knockdown; replication fork protection assay; Western blot; rescue experiments with SET8\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic rescue experiments with mechanistic pathway placement at replication forks, single lab\",\n      \"pmids\": [\"37940188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structures of the DCAF2:DDB1:DDA1 complex (3.3 Å), a ligand-bound complex (3.1 Å), and a ternary complex with a covalent PROTAC and BRD4 (3.4 Å) reveal PROTAC-mediated substrate recruitment to DCAF2. CDT2 residue C141 in the WD40 domain engages covalent ligands. DCAF2 demonstrates robust ubiquitination activity in biochemical assays upon covalent PROTAC engagement.\",\n      \"method\": \"Cryo-EM structure determination; in vitro ubiquitination assay; cellular TPD (COFFEE method); covalent compound engagement at C141\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure at near-atomic resolution combined with in vitro ubiquitination and cellular degradation validation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"41045927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM22 is a novel E3 ubiquitin ligase for CDT2 degradation. In HPV-positive cervical cancer cells, E7-mediated Rb degradation upregulates E2F1, which increases CDT2 transcription; E6-mediated p53 degradation downregulates TRIM22, leading to CDT2 accumulation. CDT2 depletion induces DNA aneuploidy and senescence via stabilization of SET8.\",\n      \"method\": \"Co-IP; Western blot; siRNA knockdown; chromatin immunoprecipitation; ubiquitination assays; cell senescence assays\",\n      \"journal\": \"Neoplasia (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay and functional senescence phenotype, single lab, mechanistic pathway defined\",\n      \"pmids\": [\"40680432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Mdm2 promotes proteasomal degradation of CDT2 (independently of p53), thereby attenuating CRL4(CDT2) activity. Mdm2-mediated CDT2 degradation stabilizes p21, Set8, and CDT1 at the G2/M phase. Loss of Mdm2 causes G2/M delay and decreased proliferation largely through increased CDT2 and subsequent decreased p21 levels.\",\n      \"method\": \"SiRNA/overexpression experiments; Western blot; ubiquitination assays; cell cycle analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 / Weak — preprint, single lab, mechanistic evidence from knockdown and overexpression but not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.07.09.663887\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DCAF2 maintains proliferation and differentiation of progenitor spermatogonia by targeting p21 and thymine DNA glycosylase (TDG) for degradation during S phase. Germ cell-specific Dcaf2 knockout causes accumulation of p21 and TDG, reduced cell proliferation, increased DNA damage, apoptosis, failure of meiosis initiation, and male infertility.\",\n      \"method\": \"Germ cell-specific conditional knockout mice (Dcaf2fl/fl x Stra8-Cre); Western blot; immunofluorescence; overexpression of p21/TDG; apoptosis assays\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout model with substrate-specific rescue experiments and defined phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"38837535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DTL mediates K48-linked ubiquitination and proteasomal degradation of SMAD4 in pancreatic cancer cells. This activates the Wnt/β-catenin pathway to promote tumorigenesis. Knockdown of DTL suppresses tumor growth and metastasis in vivo.\",\n      \"method\": \"Co-IP; in vitro ubiquitination assay (K48 linkage); Western blot; siRNA knockdown; xenograft model\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro ubiquitination with K48 linkage specificity plus in vivo validation, single lab\",\n      \"pmids\": [\"41203163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Under hypoxia, HIF-1α transcriptionally activates DTL expression. DTL then promotes ubiquitination and degradation of SLTM (SAFB-like transcription modulator), relieving transcriptional repression of Notch1 and activating the Notch pathway to promote HCC proliferation, metastasis, and sorafenib resistance.\",\n      \"method\": \"RNA-sequencing; Co-IP; ubiquitination assay; Western blot; ChIP; orthotopic tumor model; siRNA knockdown\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay and ChIP with in vivo tumor models, single lab\",\n      \"pmids\": [\"39384740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DTL promotes K11-linked ubiquitination-mediated degradation of ARGLU1 in head and neck squamous cell carcinoma. This activates the CSL-dependent Notch signaling pathway. siARGLU1 blocks the inhibitory effects of DTL knockdown on HNSCC cells.\",\n      \"method\": \"Mass spectrometry; Co-IP; ubiquitination assay (K11 linkage); siRNA rescue experiments; in vivo tumor growth assay\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — K11-linked ubiquitination assay with MS identification and rescue experiment, single lab\",\n      \"pmids\": [\"38218284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DTL ubiquitinates and degrades PROX1 in hepatocytes during ischemia/reperfusion injury. DTL-mediated PROX1 degradation increases polyunsaturated fatty acid (PUFA) levels, triggering ferroptosis and exacerbating hepatic I/R injury. Sex-specific differential DTL expression in mice determines sex disparity of I/R-induced ferroptosis.\",\n      \"method\": \"Multi-omics analysis; Co-IP; ubiquitination assay; Western blot; in vivo I/R mouse model; ferroptosis markers\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay with mechanistic downstream ferroptosis link, single lab\",\n      \"pmids\": [\"40560731\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DTL (also known as CDT2/DCAF2/L2DTL) is the substrate-recognition adaptor of the CRL4(CDT2) E3 ubiquitin ligase complex, which couples ubiquitin-mediated proteolysis to DNA synthesis by directly binding PCNA loaded on DNA via a high-affinity C-terminal PIP box; substrates bearing a 'PIP degron' (TD residues in PIP box plus basic residues at +3/+4 positions) are ubiquitylated on chromatin and degraded in S phase or after DNA damage, with confirmed substrates including CDT1, p21, SET8/PR-Set7, E2F1, CHK1, XPG, FBH1, DNA polymerase δ p12 subunit, PCNA (monoubiquitination), CRY1, NIK, DNA-PKcs, PDCD4, SMAD4, SLTM, ARGLU1, and RUVBL1; CDT2 activity is regulated by CDK-mediated phosphorylation (reducing PCNA affinity), ATR phosphorylation (promoting substrate degradation after UV), SCF(FBXO11)-mediated degradation, 14-3-3 protein shielding, DDB2-mediated degradation, TRIM22-mediated degradation, and Mdm2-mediated degradation, making CRL4(CDT2) a master regulator of genome integrity, DNA replication licensing, checkpoint signaling, chromatin modification, and circadian clock amplitude.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DTL (CDT2/DCAF2/L2DTL) is the substrate-recognition subunit (DCAF) of the CUL4-DDB1 (CRL4) E3 ubiquitin ligase, which it converts into a PCNA-coupled proteolytic machine that links protein destruction to DNA synthesis [#0, #1]. CDT2 docks onto DNA-loaded PCNA through a C-terminal PIP box that binds PCNA with roughly two orders of magnitude higher affinity than canonical PIP boxes and occupies all three sites of the trimeric ring [#22, #23], and an adjacent C-terminal DNA-binding region further potentiates ligase activity [#28]; substrates are recognized through a specialized 'PIP degron' that requires TD residues within the PIP box plus a basic residue at the +3/+4 position [#13]. Through this mechanism CRL4(CDT2) ubiquitylates substrates on chromatin during S phase and after DNA damage to safeguard genome integrity: it destroys the licensing factor CDT1 to prevent rereplication [#0, #1, #3], degrades the histone methyltransferase SET8/PR-Set7 to control H4K20me1 and chromatin compaction [#7, #9], and removes p21, the DNA polymerase delta p12 subunit, FBH1, XPG, and TDG to coordinate replication, translesion synthesis, and nucleotide excision repair, while also monoubiquitylating PCNA itself to promote TLS [#8, #12, #16, #17, #19, #37]. CRL4(CDT2) extends beyond replication to checkpoint control, degrading activated CHK1 in the nucleoplasm [#11], and to the circadian clock, where it targets CRY1 to set Bmal1 oscillation amplitude [#20]. CDT2 activity is itself tightly regulated: CDK phosphorylation of its C-terminus lowers PCNA affinity and inactivates the ligase [#24], ATR phosphorylation after UV accelerates substrate degradation [#21], and its abundance is controlled by multiple ligases and adaptors including SCF(FBXO11) opposed by 14-3-3 shielding of phospho-Thr464 [#14, #15, #18], DDB2 [#30], TRIM22 [#35], and APC/C-Cdh1 in mitosis [#5]. Genetic ablation establishes CDT2 as essential for genome stability in the early embryonic, oocyte, and spermatogonial cell cycles [#4, #31, #37], and the protein is co-opted in cancer, where it degrades tumor suppressors such as PDCD4, SMAD4, SLTM, and ARGLU1 to drive proliferation, Notch and Wnt signaling, and therapy resistance [#27, #38, #39, #40]. Cryo-EM structures of the DCAF2:DDB1:DDA1 complex define how a covalent ligand engaging WD40 residue C141 enables PROTAC-mediated neosubstrate recruitment [#34].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established the founding identity of DTL/CDT2 as a substrate receptor for the CUL4-DDB1 ligase that couples CDT1 destruction to ongoing DNA synthesis, explaining how cells avoid rereplication.\",\n      \"evidence\": \"DCAF identification by affinity-MS, Xenopus extract reconstitution, and siRNA knockdown in human cells with rereplication phenotype\",\n      \"pmids\": [\"16949367\", \"16861906\", \"17085480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural basis of PCNA engagement\", \"Mechanism of damage-induced versus S-phase recruitment not separated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated CDT2 is genetically essential, with knockout causing early embryonic lethality and depletion causing mitotic catastrophe, showing the ligase is required for viable cell-cycle progression.\",\n      \"evidence\": \"Targeted gene disruption in mice, siRNA microinjection into embryos, and RNAi in HeLa cells\",\n      \"pmids\": [\"17107960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate(s) responsible for lethality not pinpointed in vivo\", \"Did not distinguish replication-licensing from checkpoint contributions\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked CDT2 to p53 pathway regulation by implicating CUL4A-CDT2-PCNA in MDM2 and p53 turnover, broadening its role beyond replication licensing.\",\n      \"evidence\": \"Co-IP and in vitro ubiquitination with siRNA knockdown\",\n      \"pmids\": [\"16861890\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect effects on p53 not fully separated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Characterized cell-cycle-dependent localization and identified Aurora kinase B phosphorylation controlling CDT2 stability, indicating mitotic regulation of the protein.\",\n      \"evidence\": \"Immunocytochemistry, in vitro AURKB kinase assay, and AURKB knockdown\",\n      \"pmids\": [\"18542055\", \"17106265\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of contractile-ring/centrosome localization unresolved\", \"Phosphosite mapping incomplete\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the molecular grammar of CRL4(CDT2) targeting—the PIP degron with TD residues and downstream basic residue—and showed it can convert a non-substrate into a substrate, providing a predictive substrate code.\",\n      \"evidence\": \"Chimera and mutagenesis of CDT1/Ligase I with cellular degradation assays\",\n      \"pmids\": [\"21143559\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of degron-PCNA-CDT2 recognition not yet visualized\", \"Did not address why some PIP proteins escape degradation\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Expanded the substrate repertoire into chromatin and replication regulation by establishing PCNA-coupled degradation of SET8/PR-Set7 (controlling H4K20me1) and monoubiquitination of PCNA promoting translesion synthesis.\",\n      \"evidence\": \"PIP-degron mutagenesis, laser micro-irradiation, ChIP, in vitro ubiquitination, and TLS assays\",\n      \"pmids\": [\"20932472\", \"21035370\", \"20129063\", \"21220508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative S-phase versus damage contributions of each substrate not fully partitioned\", \"PCNA monoubiquitination versus Rad18 pathway interplay incompletely defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed CRL4(CDT2) function reaches checkpoint and transcriptional control by degrading activated CHK1 (in the nucleoplasm, PCNA-independent) and oscillatory destruction of E2F1, revealing context-dependent recruitment modes.\",\n      \"evidence\": \"Co-IP, compartment fractionation, knockdown in human cells, and Drosophila genetic epistasis with computational modeling\",\n      \"pmids\": [\"23109433\", \"22037307\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PCNA-independent recruitment mechanism for CHK1 unresolved\", \"E2F1 oscillator demonstrated in Drosophila endocycles, not human mitotic cycles\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected CDT2 to mismatch repair and replication fidelity by linking alkylation-induced p21 degradation and Pol delta p12 turnover to chromatin repair-factor recruitment.\",\n      \"evidence\": \"PCNA-binding mutant analysis, chromatin fractionation, PIP-degron mutagenesis, and knockdown\",\n      \"pmids\": [\"21725088\", \"23913683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ubiquitination of these substrates by CRL4(CDT2) inferred from cellular assays\", \"Single lab for each substrate\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed how CDT2 abundance is itself controlled, with SCF(FBXO11) degrading CDT2 antagonistically to CDK phosphorylation at Thr464, defining cross-ligase regulation that times cell-cycle exit and TGF-beta responses.\",\n      \"evidence\": \"Affinity-MS, phospho-degron mutagenesis, in vitro ubiquitination, C. elegans epistasis, and signaling/migration assays\",\n      \"pmids\": [\"23478441\", \"23478445\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative balance of autoubiquitylation versus FBXO11 in vivo not resolved\", \"Tissue-specific relevance of CDT2 turnover unaddressed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended the DNA-damage substrate set to FBH1, showing degradation of this anti-recombinase helicase facilitates TLS polymerase eta recruitment after UV.\",\n      \"evidence\": \"Non-degradable FBH1 mutant, Co-IP, chromatin fractionation, and immunofluorescence\",\n      \"pmids\": [\"23677613\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"In vivo genome-stability consequence of FBH1 stabilization not measured\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified 14-3-3 proteins as phospho-Thr464-dependent shields that protect CDT2 from FBXO11, adding a layer of stability control required for cell-cycle progression.\",\n      \"evidence\": \"Phospho-mimicking/blocking CDT2 mutants, Co-IP, ubiquitination assays, and cell-cycle analysis\",\n      \"pmids\": [\"25154416\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which signals drive 14-3-3 binding dynamics not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Broadened CRL4(CDT2) function into nucleotide excision repair completion and the circadian clock by degrading XPG after lesion incision and targeting CRY1 at Lys585 to set Bmal1 oscillation amplitude.\",\n      \"evidence\": \"Proximity ligation, NER synthesis assays, in vitro ubiquitination with K585A mutant, mouse liver, and luciferase circadian reporters\",\n      \"pmids\": [\"25483071\", \"26431207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PCNA dependence of CRY1 targeting in vivo not fully resolved\", \"Tissue specificity of circadian role beyond liver untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided the structural and biochemical basis for CDT2 substrate-targeting via its uniquely high-affinity C-terminal PIP box that occupies all three PCNA sites, and showed CDK phosphorylation inactivates the ligase by lowering PCNA affinity.\",\n      \"evidence\": \"X-ray crystallography of PCNA-PIP peptide complexes, binding assays, Cdt2PIP and 18-site CDK mutagenesis, and in vitro/cellular ubiquitination assays\",\n      \"pmids\": [\"30623174\", \"30301766\", \"29424068\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full CRL4(CDT2)-substrate-PCNA-DNA assembly not visualized\", \"How DNA loading is sensed structurally remains open\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established immune and developmental roles by showing DCAF2 degrades NIK in dendritic cells and controls M-phase exit in T cells via H4K20me1, linking the ligase to autoimmunity and lymphocyte proliferation.\",\n      \"evidence\": \"Conditional knockout mice, in vivo ubiquitination, H4K20me1 ChIP, proteasome activity, and immunological assays\",\n      \"pmids\": [\"30018073\", \"30245026\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NIK targeting is PCNA-coupled not addressed\", \"M-phase H4K20me1-Aurkb axis mechanistic chain partly correlative\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a C-terminal DNA-binding domain that enhances ligase activity and showed the WD40 region alone supports complex formation but not full activity, refining the domain architecture of catalysis.\",\n      \"evidence\": \"Domain deletion, DNA-binding and in vitro ubiquitination assays, cellular CDT1 degradation\",\n      \"pmids\": [\"30649446\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural integration of DNA-binding domain with PIP box and PCNA unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Expanded oncogenic substrate signaling—degrading DNA-PKcs to impair NHEJ and ubiquitinating RUVBL1 to reroute chromatin and transcriptional programs—linking CDT2 dysregulation to genomic instability and radioresistance.\",\n      \"evidence\": \"Co-IP, ubiquitination and NHEJ repair assays, xenografts, and immunohistochemistry\",\n      \"pmids\": [\"33627782\", \"38609375\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PCNA/degron dependence of these substrates not established\", \"Single lab per substrate\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Added DDB2 as an additional regulator that degrades CDT2 PCNA-independently, indirectly tuning CDT1 stability and pre-replication complex assembly.\",\n      \"evidence\": \"In vivo ubiquitination, PIP-box mutagenesis, knockdown/overexpression, and FACS\",\n      \"pmids\": [\"33557942\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological context where DDB2 dominates CDT2 turnover unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed CDT2 activity must be restrained at stalled replication forks, with DCAF14 limiting CDT2-driven SET8 loss to prevent nuclease-mediated nascent DNA degradation and fork collapse.\",\n      \"evidence\": \"siRNA knockdown, fork protection assays, and SET8 rescue experiments\",\n      \"pmids\": [\"37940188\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which DCAF14 modulates CDT2 not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated germline-specific requirements for CDT2 in maintaining spermatogonial proliferation and meiotic entry through degradation of p21 and TDG, paralleling its essential maternal role.\",\n      \"evidence\": \"Germ cell-specific conditional knockout mice with substrate rescue and apoptosis assays\",\n      \"pmids\": [\"38837535\", \"28818995\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of p21 versus TDG in vivo not fully partitioned\", \"Whether other substrates contribute to phenotype untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established DTL as an oncogenic driver in solid tumors through novel-linkage ubiquitination of SMAD4 (K48), SLTM, and ARGLU1 (K11) to activate Wnt and Notch signaling, broadening its substrate landscape into developmental signaling.\",\n      \"evidence\": \"MS, Co-IP, linkage-specific ubiquitination assays, ChIP, rescue, and in vivo tumor models\",\n      \"pmids\": [\"41203163\", \"39384740\", \"38218284\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PCNA/degron requirements for these substrates not tested\", \"Single lab per substrate\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided cryo-EM structures of the DCAF2:DDB1:DDA1 complex and a PROTAC ternary complex with BRD4, identifying WD40 residue C141 as a covalent handle for targeted protein degradation, establishing CDT2 as a druggable ligase scaffold.\",\n      \"evidence\": \"Cryo-EM structure determination, in vitro ubiquitination, and cellular TPD assays with covalent compounds\",\n      \"pmids\": [\"41045927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of an endogenous-substrate ternary complex not solved\", \"Selectivity of C141-targeting ligands in cells incompletely characterized\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified additional upstream ligases—TRIM22 (downregulated by HPV E6) and Mdm2—that control CDT2 abundance, linking CDT2 dysregulation to viral oncogenesis and senescence via SET8/p21 stabilization.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, ChIP, knockdown/overexpression, and senescence assays (one preprint)\",\n      \"pmids\": [\"40680432\", \"bio_10.1101_2025.07.09.663887\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mdm2 finding is a non-peer-reviewed preprint awaiting validation\", \"Hierarchy among the multiple CDT2-degrading ligases in different contexts unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended CDT2 substrate biology to ferroptosis and tissue injury through PROX1 degradation in hepatocytes during ischemia/reperfusion, with sex-dependent expression governing injury severity.\",\n      \"evidence\": \"Multi-omics, Co-IP, ubiquitination assays, and in vivo I/R mouse models with ferroptosis markers\",\n      \"pmids\": [\"40560731\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PROX1 degradation is PCNA-coupled unaddressed\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the full CRL4(CDT2) holoenzyme engages a PIP-degron substrate on DNA-loaded PCNA at atomic resolution, and how the many competing CDT2-degrading ligases are coordinated to set ligase activity in distinct tissues and disease states.\",\n      \"evidence\": \"Open question synthesized from current structural and regulatory gaps in the timeline\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of an endogenous substrate-PCNA-CRL4(CDT2) ternary complex\", \"Quantitative integration of FBXO11, DDB2, TRIM22, Mdm2, and APC/C control of CDT2 levels lacking\", \"Substrate-selectivity rules across tissues not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 8, 20, 22, 38]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 7, 13, 22]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 13, 22]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [28]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [24, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 11]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [7, 9, 0]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 3, 10, 24]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [16, 19, 29, 8]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [0, 3, 17, 33]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 22, 34]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [7, 9, 26]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [25, 26]}\n    ],\n    \"complexes\": [\"CRL4(CDT2) / CUL4-DDB1-CDT2 E3 ubiquitin ligase\"],\n    \"partners\": [\"DDB1\", \"CUL4A\", \"PCNA\", \"CDT1\", \"DDA1\", \"FBXO11\", \"DDB2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}