{"gene":"E2F8","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2005,"finding":"E2F8 contains two distinct DNA-binding domains (unlike canonical E2Fs), binds DNA without DP co-factors, lacks DP-dimerization/retinoblastoma-binding/transcriptional activation domains, and functions as a transcriptional repressor that inhibits E2F-driven promoters and slows cell proliferation when overexpressed in primary MEFs.","method":"Sequence analysis, recombinant protein DNA-binding assay, promoter reporter assays, overexpression in primary mouse embryonic fibroblasts","journal":"The Journal of biological chemistry / Nucleic acids research / Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — independently replicated across three labs (PMID 15722552, 16179649, 15897886) using in vitro DNA-binding assays, reporter assays, and functional proliferation readouts","pmids":["15722552","16179649","15897886"],"is_preprint":false},{"year":2005,"finding":"The integrity of both DNA-binding domains of E2F8 is required for DNA binding; mutations disrupting either domain abolish DNA binding activity.","method":"Active-site/domain mutagenesis, DNA-binding assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — mutagenesis with functional readout but single lab, single paper","pmids":["15897886"],"is_preprint":false},{"year":2005,"finding":"E2F8 can homodimerize and is expressed in the same adult tissues as E2F7, suggesting overlapping roles; E2F8 overexpression significantly slows proliferation of primary MEFs.","method":"Co-immunoprecipitation (homodimerization), overexpression proliferation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP for dimerization confirmed in two independent papers, proliferation assay replicated","pmids":["15722552","16179649"],"is_preprint":false},{"year":2008,"finding":"E2F7 and E2F8 form homo- and heterodimers that occupy target gene promoters (including E2f1) and act as transcriptional repressors; combined loss of E2f7 and E2f8 (but not either alone) causes massive apoptosis and embryonic lethality. Genetic suppression by loss of E2f1 or p53 rescues apoptosis, placing E2F7/E2F8 upstream of the E2F1–p53 apoptotic axis.","method":"Mouse knockout genetics (E2f7 and E2f8 single and double knockouts), chromatin immunoprecipitation (ChIP) on target promoters, epistasis (E2f1 and p53 loss-of-function rescue)","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vivo double knockout with defined phenotype, ChIP for promoter occupancy, genetic epistasis with multiple suppressor alleles in a single rigorous study","pmids":["18194653"],"is_preprint":false},{"year":2008,"finding":"E2F7 and E2F8 are induced by DNA-damaging agents, bind the E2F1 promoter as a DNA-binding complex, repress E2F1 expression, and are required for cell-cycle effects of the DNA-damage response; depletion of either subunit increases E2F1 expression and prevents DNA-damage-induced cell-cycle arrest.","method":"ChIP on E2F1 and other E2F-responsive gene promoters, siRNA knockdown with cell-cycle and E2F1 expression readouts","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal occupancy by ChIP and functional knockdown with defined cell-cycle phenotype, two orthogonal methods","pmids":["18202719"],"is_preprint":false},{"year":2007,"finding":"In a yeast expression system, E2F8 activates heterotrimeric G proteins as a guanine nucleotide exchange factor (GEF) for Gαi; epistasis showed E2F8 acts at the level of G proteins (not receptors), is antagonized by the GTPase-activating protein RGS4, and the first 200 N-terminal residues carry most activity.","method":"Yeast expression cloning, epistasis with Gα subunits and RGS4, receptor-independent activation assay","journal":"Journal of molecular signaling","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, heterologous yeast system; biological relevance in mammalian cells not established","pmids":["17394670"],"is_preprint":false},{"year":2012,"finding":"E2F8 is required for hepatocyte binucleation and polyploidization in mice; E2f8 deficiency leads to increased expression of E2F target genes that promote cytokinesis, preventing polyploidization. E2F8 and E2F1 occupy the same subset of target promoters with opposing effects (E2F8 represses, E2F1 activates); loss of E2f1 enhances polyploidization and suppresses the E2f8-deficiency polyploidization defect.","method":"Mouse liver-specific knockout (E2f8 and E2f1 loss-of-function), ChIP on target promoters, epistasis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout with defined polyploidization phenotype, ChIP for promoter co-occupancy, genetic epistasis with E2f1 rescuing the E2f8 phenotype","pmids":["23064264"],"is_preprint":false},{"year":2012,"finding":"E2F7 and E2F8 directly bind and transcriptionally activate the VEGFA promoter in a HIF1-dependent complex, independent of canonical E2F binding elements, thereby promoting angiogenesis; simultaneous deletion of E2F7/8 in zebrafish and mice causes severe vascular defects.","method":"VEGFA promoter reporter assay, ChIP, zebrafish and mouse double knockout with vascular phenotype readout","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — promoter reporter + ChIP + two model organism knockouts; replicated across species with consistent vascular phenotype","pmids":["22903062"],"is_preprint":false},{"year":2010,"finding":"E2F8 binds regulatory elements of the cyclin D1 (CCND1) promoter and activates its transcription, promoting S-phase accumulation in hepatocellular carcinoma cells.","method":"ChIP, promoter reporter assay, overexpression and knockdown with cell-cycle and gene expression readouts","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP combined with reporter assay and functional cell-cycle readout, single lab","pmids":["20068156"],"is_preprint":false},{"year":2014,"finding":"Rb and E2F8 co-suppress E2F target genes critical for DNA replication during erythroid terminal differentiation; loss of both Rb and E2f8 synergizes to increase E2F2 binding to target promoters and causes stressed DNA replication, DNA damage, and defective erythropoiesis rescued by inactivation of E2f2.","method":"Erythroid-specific Rb and E2f8 conditional knockouts, gene expression profiling, ChIP, epistasis with E2f2","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo double conditional KO with ChIP and E2f2 epistasis rescue across multiple orthogonal methods","pmids":["24865965"],"is_preprint":false},{"year":2015,"finding":"E2F8 directly binds the UHRF1 promoter and activates its transcription in lung cancer cells, as determined by ChIP and promoter activity assays; E2F8 depletion reduces UHRF1 expression and inhibits tumor growth.","method":"ChIP, promoter reporter assay, siRNA knockdown, xenograft tumor growth","journal":"Journal of the National Cancer Institute","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assay plus in vivo xenograft, single lab","pmids":["26089541"],"is_preprint":false},{"year":2015,"finding":"E2F8 is highly expressed in decidual cells in mice, is regulated by progesterone through the HB-EGF/EGFR/ERK/STAT3 signaling pathway, and transcriptionally suppresses CDK1, thereby triggering polyploidization of decidual cells.","method":"In vivo mouse decidualization model, signaling pathway inhibitor studies, ChIP/gene expression analysis of CDK1","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional in vivo model with pathway dissection and CDK1 as transcriptional target, single lab","pmids":["25892397"],"is_preprint":false},{"year":2015,"finding":"E2F8 promotes FABP3 expression in liver during diet-induced obesity in zebrafish; E2f8 morpholino knockdown suppresses fabp3 expression and ameliorates hepatic steatosis, and E2F8 overexpression in human HepG2 cells promotes FABP3 expression.","method":"Morpholino knockdown in zebrafish, overexpression in human HepG2 cells, transcriptome/proteome analysis","journal":"Nutrition & metabolism","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — in vivo morpholino plus human cell overexpression with two orthogonal methods","pmids":["26052340"],"is_preprint":false},{"year":2016,"finding":"E2F8's DNA-binding activity is essential for its tumor suppressor function in postnatal liver; disruption of E2F8 DNA-binding domain phenocopies E2f8 null allele and leads to HCC. Combined hepatocyte-specific deletion of E2f7 and E2f8 causes HCC, with E2F8's critical tumor suppressor window during the first 2 weeks of postnatal life.","method":"Conditional knockout mice (temporal-specific ablation), DNA-binding domain mutant knock-in, chromatin occupancy profiling (ChIP-seq), gene expression profiling","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vivo knockout, DNA-binding domain mutagenesis phenocopy, ChIP-seq for target identification, multiple alleles tested","pmids":["27454291"],"is_preprint":false},{"year":2016,"finding":"E2F8 directly binds the CCNE1 and CCNE2 promoters and transcriptionally upregulates their expression, accelerating G1-to-S phase transition in breast cancer cells.","method":"ChIP, promoter reporter assay, overexpression and knockdown with cell-cycle readout","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus promoter reporter plus functional cell-cycle assay, single lab","pmids":["26992224"],"is_preprint":false},{"year":2017,"finding":"E2F8 directly binds the MASTL promoter (validated by dual luciferase assay and ChIP-qPCR) and transcriptionally activates MASTL; E2F8 overexpression alleviates cisplatin-induced G2/M arrest by promoting MASTL-mediated mitotic entry, an effect cancelled by MASTL inhibition.","method":"Dual luciferase assay, ChIP-qPCR, overexpression/inhibition experiments with cell-cycle readout","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase reporter plus functional rescue, single lab","pmids":["28605876"],"is_preprint":false},{"year":2019,"finding":"RNA-binding protein NONO post-transcriptionally regulates E2F8 expression by binding to E2F8 mRNA, as shown by RNA immunoprecipitation-sequencing (RIP-seq); NONO knockdown reduces E2F8 protein levels and suppresses breast cancer cell proliferation.","method":"RIP-sequencing, expression microarray integration, siRNA knockdown of NONO","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq plus functional knockdown, single lab with two orthogonal methods","pmids":["31733123"],"is_preprint":false},{"year":2020,"finding":"E2F8 protein degradation is controlled throughout the cell cycle by an interlocking dephosphorylation switch: Cdk1 phosphorylation promotes APC/CCdh1-dependent degradation at mitotic exit; PP2A dephosphorylation coupled to the G1 phase allows E2F8 accumulation; Cyclin F regulates E2F8 specifically in G2 phase.","method":"Human cell-free systems reconstituting inter-mitotic and G1 phases, APC/C degradation assays, phosphorylation analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — cell-free reconstitution with multiple defined cell cycle stages, multiple kinase/phosphatase perturbations, F-box protein identification","pmids":["31995441"],"is_preprint":false},{"year":2019,"finding":"E2F8 is a transcriptional regulator of gluconeogenesis in primary mouse hepatocytes; adenovirus-mediated E2F8 overexpression upregulates PGC-1α, PEPCK, and G6Pase expression and increases glucose output, while E2F8 knockdown increases insulin sensitivity.","method":"Adenovirus-mediated overexpression, siRNA knockdown, glucose output assays, gene expression analysis in primary mouse hepatocytes and diabetic mouse models","journal":"Biochemistry. Biokhimiia","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — primary hepatocyte experiments with both gain- and loss-of-function and defined metabolic readouts, single lab","pmids":["31870257"],"is_preprint":false},{"year":2020,"finding":"E2F8 knockdown in pancreatic beta cells (MIN6) reduces Abcc8 (KATP channel subunit) expression by ~30%, impairing ATP-sensitive K+ channel-dependent insulin secretion.","method":"siRNA knockdown in MIN6 cells, gene expression analysis, insulin secretion assay","journal":"Diabetologia","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — loss-of-function with defined molecular mechanism (Abcc8/KATP), single lab","pmids":["32356104"],"is_preprint":false},{"year":2022,"finding":"E2F8 functions as a transcriptional repressor of Il9 in CD4+ T cells; TGF-β and IL-4 signaling induces pSmad3L-Ser213 via p38, which is necessary for Il9 transcription, and E2F8 represses this Il9 transcription. siRNA-mediated knockdown of E2f8 promotes tumor growth in mouse tumor models, while knockdown of Dbp (activator) suppresses it.","method":"siRNA knockdown in Th9 differentiation, mouse tumor models, Smad3 phosphorylation analysis, Il9 promoter studies","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo tumor models plus defined signaling pathway, single lab with functional and mechanistic readouts","pmids":["36241625"],"is_preprint":false},{"year":2023,"finding":"E2F8 directly binds the RRM2 promoter and transcriptionally activates RRM2 expression in lung adenocarcinoma cells; E2F8-driven RRM2 upregulation promotes DNA synthesis and cell cycle progression; E2F8 knockdown combined with WEE1 inhibitor MK-1775 synergistically suppresses tumor growth.","method":"Reporter gene assay, ChIP-qPCR, DNA pulldown-Western blot, overexpression/knockdown, in vitro and in vivo xenograft experiments","journal":"Biochemical pharmacology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — three orthogonal methods (reporter, ChIP-qPCR, DNA pulldown) confirming direct promoter binding plus in vivo xenograft validation","pmids":["37863324"],"is_preprint":false},{"year":2023,"finding":"E2F8 directly binds the NUSAP1 promoter and activates its transcription (confirmed by ChIP and dual-luciferase assay); E2F8-mediated NUSAP1 upregulation inhibits cisplatin-induced DNA damage and enhances cisplatin resistance in HCC cells.","method":"ChIP, dual-luciferase reporter assay, overexpression/knockdown, comet assay, flow cytometry","journal":"International journal of toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase reporter plus functional rescue, single lab","pmids":["37331996"],"is_preprint":false},{"year":2024,"finding":"E2F8 directly binds the CENPL promoter and transcriptionally activates CENPL expression; E2F8-CENPL axis promotes homologous recombination DNA repair and confers chemoresistance; CENPL overexpression partially rescues DNA damage repair defects caused by E2F8 knockdown.","method":"ChIP, reporter assay, knockdown/overexpression, HR repair assay, drug sensitivity assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional rescue with defined HR repair readout, single lab","pmids":["38522807"],"is_preprint":false},{"year":2024,"finding":"IGF-I activates the PI3K/AKT pathway to upregulate E2F8, which transcriptionally activates RAD51 expression to promote homologous recombination repair and protect granulosa cells from hypoxia-induced apoptosis.","method":"PI3K/AKT pathway inhibition, E2F8 knockdown/overexpression, RAD51 promoter analysis, HR repair assay, apoptosis assay in porcine granulosa cells","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — pathway dissection with multiple inhibitors plus E2F8 as identified transcriptional regulator of RAD51, single lab","pmids":["38095232"],"is_preprint":false},{"year":2024,"finding":"E2F8 directly binds the PDK1 promoter (validated by dual-luciferase and ChIP) and transcriptionally activates PDK1; E2F8/PDK1 axis mediates DNA damage repair to promote cisplatin resistance in lung adenocarcinoma.","method":"Dual-luciferase assay, ChIP, overexpression/knockdown, DNA damage assay (comet, γ-H2AX), NHEJ reporter, xenograft","journal":"Pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase plus multiple functional readouts, single lab","pmids":["38810606"],"is_preprint":false},{"year":2024,"finding":"E2F8 transcriptionally activates ENO1 expression (confirmed by ChIP and RNA-seq) and promotes trophoblast invasion by inhibiting SFRP1/4 to activate Wnt signaling.","method":"ChIP, plasmid transfection, RNA-seq, western blotting, transwell invasion assay, immunofluorescence","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional invasion assay with pathway identification, single lab","pmids":["38661062"],"is_preprint":false},{"year":2024,"finding":"E2F8 directly activates androgen receptor (AR) transcription; the marine compound manzamine A blocks E2F8-DNA interactions, suppressing E2F8-dependent AR and AR-V7 synthesis in prostate cancer cells and reducing tumor growth in xenograft models.","method":"RNA-seq, protein modeling of E2F8-DNA interaction, cell line and xenograft experiments with manzamine A, AR expression analysis","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — RNA-seq plus structural modeling plus in vivo xenograft, but E2F8-DNA interaction evidence is primarily computational with functional corroboration","pmids":["38605607"],"is_preprint":false},{"year":2024,"finding":"KNTC1 physically binds E2F8 protein and facilitates its nuclear translocation, enhancing E2F8-mediated transcriptional activation of MYC; MYC in turn transcriptionally upregulates KNTC1, forming a positive feedback loop driving PI3K/AKT/mTOR activation in bladder cancer.","method":"Co-immunoprecipitation, ChIP, luciferase reporter assay, nuclear fractionation, gene knockdown/overexpression, xenograft","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus ChIP plus functional readout, but single lab and very recent paper","pmids":["41639725"],"is_preprint":false},{"year":2024,"finding":"E2F8 promotes TJP1 transcription (Halo-E2F8 overexpression increases TJP1 expression and transcription); TJP1 suppresses extravillous trophoblast invasion. Loss of E2F8 increases trophoblast invasiveness through reduced TJP1 and increased MMP-1 production.","method":"E2F8 overexpression (Halo-tagged), E2F8 shRNA knockdown, TJP1 knockdown/overexpression, invasion assay, MMP-1 measurement","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Halo-E2F8 overexpression driving TJP1 transcription plus functional invasion assay, single lab","pmids":["38795825"],"is_preprint":false},{"year":2024,"finding":"E2F8 transcriptionally activates TPX2 expression; E2F8-TPX2 axis promotes glycolysis and angiogenesis, cancer progression, and reduces cisplatin and apatinib sensitivity in liver cancer cells.","method":"Bioinformatics plus qRT-PCR, CCK-8, Transwell, flow cytometry, angiogenesis assay, E2F8 overexpression reversing TPX2 knockdown effects","journal":"Cytotechnology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — primarily bioinformatics-driven with cell-based rescue experiments; no direct ChIP/reporter confirming E2F8 binding to TPX2 promoter described in abstract","pmids":["39435417"],"is_preprint":false},{"year":2024,"finding":"E2F8 directly binds the MCM7 promoter and activates MCM7 transcription (confirmed by ChIP); MCM7 overexpression rescues the suppressive effects of E2F8 knockdown on bladder cancer cell malignant phenotypes.","method":"ChIP on MCM7 promoter, overexpression rescue experiment, knockdown with proliferation/invasion assays","journal":"Biochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional rescue, single lab","pmids":["39601318"],"is_preprint":false},{"year":2025,"finding":"E2F8 is a direct APC/C substrate; flexible N-terminal domains contain APC/C recognition motifs adjacent to critical Thr residues whose phosphorylation by Cdk1 is rate-limiting for degradation; PP2A dephosphorylation of these residues acts as a molecular switch coupling E2F8 and E2F7 degradation to the G1 phase, coinciding with the rise of E2F1.","method":"Cell-free systems (inter-mitotic, G1, and prometaphase-to-G1 transitions), Cdk1 and PP2A activity perturbations, APC/C degradation assays, domain mutagenesis","journal":"bioRxiv (preprint)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cell-free reconstitution with defined enzymatic perturbations and mutagenesis; extends published PMID 31995441 findings with additional mechanistic resolution, single lab preprint","pmids":["bio_10.1101_2025.02.23.639703"],"is_preprint":true},{"year":2025,"finding":"E2F8 transcriptionally activates SPC25 expression (confirmed by dual-luciferase and ChIP); E2F8/SPC25 axis promotes glutamine metabolism to facilitate immune escape in lung adenocarcinoma; SPC25 overexpression rescues immune escape suppression caused by E2F8 knockdown.","method":"Dual-luciferase assay, ChIP, E2F8/SPC25 knockdown/overexpression, co-culture immune assay, glutamine metabolism measurements","journal":"Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase plus functional immune escape rescue, single lab","pmids":["39829079"],"is_preprint":false},{"year":2025,"finding":"E2F8 transcriptionally activates GRPEL2 expression (confirmed by luciferase reporter and ChIP assays); E2F8/GRPEL2 axis promotes colorectal cancer progression through mitochondrial dysregulation; TIGAR interacts with GRPEL2 protein (co-IP) as a downstream effector.","method":"Luciferase reporter, ChIP, Co-IP (GRPEL2-TIGAR interaction), knockdown/overexpression, in vivo metastasis model","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter plus co-IP of downstream effector, single lab","pmids":["40269881"],"is_preprint":false},{"year":2025,"finding":"E2F8 transcriptionally activates DTL expression by binding its promoter; E2F8/DTL axis activates the MAPK signaling pathway in endometrial cancer; DTL knockdown enhances PDCD4 ubiquitination; DTL overexpression or PDCD4 knockdown rescues the growth-suppressive effects of E2F8 knockdown.","method":"ChIP, bioinformatics, functional assays (proliferation, migration, invasion), xenograft, ubiquitination assay","journal":"Reproductive sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional rescue with MAPK pathway and ubiquitination readouts, single lab","pmids":["41461624"],"is_preprint":false},{"year":2025,"finding":"E2F8 transcriptionally activates EGFL6 by binding its promoter (confirmed by dual luciferase assay); EGFL6 overexpression rescues proliferation, migration, and invasion suppressed by E2F8 knockdown in endometrial cancer cells.","method":"Dual luciferase assay, shRNA knockdown, overexpression rescue, CCK-8 and Transwell assays, xenograft","journal":"Biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter plus functional rescue with defined pathway, single lab","pmids":["41555699"],"is_preprint":false},{"year":2025,"finding":"E2F8 coordinates with PAFAH1B3 to promote VEGFA transcription in gastric cancer cells; VEGFA overexpression rescues defects caused by PAFAH1B3 knockdown; in vivo xenograft experiments confirm VEGFA as a downstream effector of this pathway.","method":"Transcriptomic profiling, VEGFA overexpression rescue, xenograft, PAFAH1B3 knockdown","journal":"Biochemical pharmacology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — transcriptomic approach with rescue experiment; direct E2F8 binding to VEGFA promoter in this context is not independently confirmed with ChIP in the abstract","pmids":["42140448"],"is_preprint":false},{"year":2025,"finding":"E2F8 transcriptionally activates RRM2 expression in gallbladder cancer; E2F8-RRM2 axis drives gemcitabine resistance; a small-molecule HIT-4 identified by virtual screening disrupts E2F8-DNA interaction, reduces RRM2 expression, and synergizes with PARP inhibitors to suppress tumor growth in vivo and in patient-derived organoids.","method":"CRISPR-Cas9 genome-wide knockout screen, ChIP (implied by context of E2F8-RRM2 transcriptional regulation), virtual screening, cell viability/apoptosis assays, xenograft, patient-derived organoids","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide screen plus in vivo and PDO validation, single lab; mechanistic E2F8-DNA binding confirmed with small-molecule disruption","pmids":["41392282"],"is_preprint":false},{"year":2024,"finding":"In AR-negative castration-resistant prostate cancer, E2F8 non-canonically activates (rather than represses) target oncogenes; CRISPR/CasRx-mediated knockdown of E2F8 downregulates target oncogenes and inhibits AR-negative CRPC growth in vitro and in xenograft models.","method":"E2F8 cistrome profiling (ChIP-seq), transcriptome profiling (RNA-seq), CRISPR/CasRx knockdown, xenograft model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Moderate — integrative ChIP-seq plus RNA-seq plus in vivo CRISPR knockdown with defined growth phenotype, single lab with multiple orthogonal methods","pmids":["39613933"],"is_preprint":false}],"current_model":"E2F8 is an atypical E2F transcription factor with two tandem DNA-binding domains that binds DNA and represses transcription independently of DP dimerization partners or retinoblastoma protein; it forms homo- and heterodimers with E2F7 to repress E2F1 and downstream cell cycle targets, thereby controlling cell proliferation, embryonic development, hepatocyte polyploidization, and the DNA-damage response. E2F8 protein levels oscillate across the cell cycle through APC/CCdh1-mediated ubiquitin-dependent degradation triggered by Cdk1 phosphorylation and reversed by PP2A, with additional regulation by Cyclin F in G2. Beyond canonical repression, context-dependent transcriptional activation of targets including VEGFA (with HIF1), CCND1, CCNE1/2, RRM2, UHRF1, MASTL, RAD51, and others has been established by ChIP and reporter assays, and in AR-negative prostate cancer E2F8 acts non-canonically as a transcriptional activator of oncogenes."},"narrative":{"mechanistic_narrative":"E2F8 is an atypical E2F-family transcription factor that controls cell proliferation, embryonic development, and the DNA-damage response through a non-canonical mode of DNA binding [PMID:15722552, PMID:16179649, PMID:15897886, PMID:18194653]. Unlike canonical E2Fs, it contains two tandem DNA-binding domains—both required for DNA occupancy—and binds DNA independently of DP partners and retinoblastoma protein, lacking the dimerization and activation domains those proteins require [PMID:15722552, PMID:16179649, PMID:15897886]. It homodimerizes and forms heterodimers with the related E2F7, and the two together occupy target promoters as a repressive DNA-binding complex; concurrent loss of E2f7 and E2f8 (but neither alone) causes massive apoptosis and embryonic lethality that is rescued by removal of E2f1 or p53, placing the E2F7/E2F8 complex upstream of the E2F1–p53 axis [PMID:15722552, PMID:16179649, PMID:18194653]. As a repressor, E2F8 is induced by DNA damage to silence the E2F1 promoter and enforce cell-cycle arrest, antagonizes the proliferation-promoting activities of activator E2Fs by co-occupying shared promoters with opposing effect, and drives hepatocyte and decidual polyploidization by suppressing cytokinesis genes such as CDK1 [PMID:18202719, PMID:23064264, PMID:25892397]. In the liver this repressive program constitutes a tumor-suppressor function whose loss—or disruption of the DNA-binding domain—causes hepatocellular carcinoma [PMID:27454291]. E2F8 protein abundance oscillates across the cell cycle: Cdk1 phosphorylation of N-terminal threonines adjacent to APC/C recognition motifs licenses APC/C^Cdh1-dependent degradation at mitotic exit, PP2A dephosphorylation couples its accumulation to G1, and Cyclin F provides additional G2 control [PMID:31995441]. Beyond repression, E2F8 acts context-dependently as a transcriptional activator: with HIF1 it directly activates VEGFA to drive angiogenesis [PMID:22903062], and across diverse cancers it directly binds and activates cell-cycle, replication, and DNA-repair genes including CCND1, CCNE1/2, RRM2, UHRF1, MASTL, and RAD51 to promote proliferation, DNA repair, and chemoresistance [PMID:20068156, PMID:26089541, PMID:26992224, PMID:37863324, PMID:38095232]. In AR-negative castration-resistant prostate cancer this activator role dominates, with E2F8 driving an oncogenic cistrome [PMID:39613933].","teleology":[{"year":2005,"claim":"Established that E2F8 is a structurally distinct E2F that binds DNA and represses transcription without the dimerization and Rb-binding machinery of canonical family members, defining it as an atypical repressor.","evidence":"Sequence analysis, recombinant DNA-binding assays, promoter reporters, and overexpression in primary MEFs; domain mutagenesis showing both DNA-binding domains are required","pmids":["15722552","16179649","15897886"],"confidence":"High","gaps":["Endogenous target gene set not yet defined","Physiological partners beyond homodimer not yet identified"]},{"year":2008,"claim":"Resolved how E2F8 acts in vivo by showing it functions as an E2F7/E2F8 repressor complex that restrains the E2F1–p53 apoptotic axis, explaining its essential role in development.","evidence":"E2f7/E2f8 single and double knockout mice, ChIP on the E2f1 promoter, and genetic epistasis with E2f1 and p53 loss-of-function","pmids":["18194653","18202719"],"confidence":"High","gaps":["Determinants of homo- versus hetero-dimer choice unknown","How DNA damage induces E2F7/8 not mechanistically resolved"]},{"year":2012,"claim":"Connected E2F8 repression to physiological ploidy control and to context-dependent activation, showing it suppresses cytokinesis genes to drive hepatocyte polyploidization yet co-activates VEGFA with HIF1.","evidence":"Liver-specific E2f8 knockout with E2f1 epistasis and promoter ChIP; VEGFA reporter, ChIP, and zebrafish/mouse double knockouts with vascular phenotypes","pmids":["23064264","22903062"],"confidence":"High","gaps":["Molecular switch between repressive and activating modes unresolved","How HIF1 redirects E2F8 to non-canonical elements unclear"]},{"year":2016,"claim":"Demonstrated that E2F8's DNA-binding activity is the basis of a bona fide tumor-suppressor function with a defined developmental window, by knock-in phenocopy of the null allele.","evidence":"Temporal conditional knockouts, DNA-binding-domain mutant knock-in, and ChIP-seq in postnatal liver","pmids":["27454291"],"confidence":"High","gaps":["Why the tumor-suppressor window is restricted to early postnatal life is unexplained","Genome-wide target overlap with E2F7 in liver not fully mapped"]},{"year":2020,"claim":"Defined how E2F8 protein levels are timed across the cell cycle, identifying a Cdk1/PP2A phospho-switch that gates APC/C^Cdh1-dependent degradation, with Cyclin F adding G2 control.","evidence":"Human cell-free systems reconstituting inter-mitotic and G1 phases with kinase/phosphatase perturbations and APC/C degradation assays","pmids":["31995441"],"confidence":"High","gaps":["In vivo physiological consequence of mis-timed degradation untested","Precise degron and phospho-site mapping deferred to later work"]},{"year":2023,"claim":"Broadened the activator role of E2F8 by showing direct activation of replication/repair effectors that drive proliferation and chemoresistance across multiple cancers.","evidence":"ChIP-qPCR, reporter and DNA-pulldown assays plus knockdown/xenograft for RRM2, RAD51, CENPL, and others","pmids":["37863324","38522807","38095232"],"confidence":"High","gaps":["Cofactors that convert E2F8 to an activator in cancer not identified","Whether activation requires displacement of the E2F7/8 repressor complex unknown"]},{"year":2024,"claim":"Showed that in AR-negative castration-resistant prostate cancer E2F8 operates predominantly as a transcriptional activator of an oncogenic cistrome, establishing a lineage-specific reversal of its canonical repressor identity.","evidence":"E2F8 ChIP-seq and RNA-seq integration with CRISPR/CasRx knockdown and xenograft growth readouts","pmids":["39613933"],"confidence":"High","gaps":["Chromatin context driving activation versus repression not defined","Generality across other AR-negative tumors untested"]},{"year":2025,"claim":"Refined the degradation model by mapping APC/C recognition motifs and Cdk1-phosphorylated threonines in flexible N-terminal domains, showing PP2A acts as the molecular switch coupling E2F8/E2F7 turnover to G1 and the rise of E2F1.","evidence":"Cell-free reconstitution across mitotic-to-G1 transitions with Cdk1/PP2A perturbations and degron mutagenesis (preprint)","pmids":["bio_10.1101_2025.02.23.639703"],"confidence":"High","gaps":["Preprint not yet peer-reviewed","Structural basis of APC/C engagement not resolved"]},{"year":null,"claim":"The molecular determinant that toggles E2F8 between an E2F7-partnered repressor and a context-dependent transcriptional activator remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No defined cofactor or modification that switches repression to activation","Relationship between activator cistromes and the canonical E2F7/8 repressive complex unmapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3,7,21,39]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,13]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,28]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,6,14,17]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,3,7]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[4,24,23]}],"complexes":["E2F7/E2F8 repressor complex"],"partners":["E2F7","HIF1","KNTC1","PAFAH1B3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"A0AVK6","full_name":"Transcription factor E2F8","aliases":[],"length_aa":867,"mass_kda":94.2,"function":"Atypical E2F transcription factor that participates in various processes such as angiogenesis and polyploidization of specialized cells. Mainly acts as a transcription repressor that binds DNA independently of DP proteins and specifically recognizes the E2 recognition site 5'-TTTC[CG]CGC-3'. Directly represses transcription of classical E2F transcription factors such as E2F1: component of a feedback loop in S phase by repressing the expression of E2F1, thereby preventing p53/TP53-dependent apoptosis. Plays a key role in polyploidization of cells in placenta and liver by regulating the endocycle, probably by repressing genes promoting cytokinesis and antagonizing action of classical E2F proteins (E2F1, E2F2 and/or E2F3). Required for placental development by promoting polyploidization of trophoblast giant cells. Acts as a promoter of sprouting angiogenesis, possibly by acting as a transcription activator: associates with HIF1A, recognizes and binds the VEGFA promoter, which is different from canonical E2 recognition site, and activates expression of the VEGFA gene","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/A0AVK6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/E2F8","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/E2F8","total_profiled":1310},"omim":[{"mim_id":"612047","title":"E2F TRANSCRIPTION FACTOR 8; E2F8","url":"https://www.omim.org/entry/612047"},{"mim_id":"612046","title":"E2F TRANSCRIPTION FACTOR 7; E2F7","url":"https://www.omim.org/entry/612046"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":13.4},{"tissue":"lymphoid tissue","ntpm":11.0},{"tissue":"skeletal muscle","ntpm":11.8}],"url":"https://www.proteinatlas.org/search/E2F8"},"hgnc":{"alias_symbol":["FLJ23311"],"prev_symbol":[]},"alphafold":{"accession":"A0AVK6","domains":[{"cath_id":"-","chopping":"119-221_247-253_262-346","consensus_level":"medium","plddt":80.6136,"start":119,"end":346}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/A0AVK6","model_url":"https://alphafold.ebi.ac.uk/files/AF-A0AVK6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-A0AVK6-F1-predicted_aligned_error_v6.png","plddt_mean":53.09},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=E2F8","jax_strain_url":"https://www.jax.org/strain/search?query=E2F8"},"sequence":{"accession":"A0AVK6","fasta_url":"https://rest.uniprot.org/uniprotkb/A0AVK6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/A0AVK6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/A0AVK6"}},"corpus_meta":[{"pmid":"18194653","id":"PMC_18194653","title":"Synergistic function of E2F7 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endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/38795825","citation_count":1,"is_preprint":false},{"pmid":"40269881","id":"PMC_40269881","title":"E2F8-induced GRPEL2 promoted colorectal cancer progression via targeting TIGAR.","date":"2025","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40269881","citation_count":1,"is_preprint":false},{"pmid":"41392282","id":"PMC_41392282","title":"Targeting E2F8 sensitizes gemcitabine-resistant gallbladder cancer to PARP inhibitors by disrupting RRM2-driven DNA repair.","date":"2025","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/41392282","citation_count":1,"is_preprint":false},{"pmid":"41555699","id":"PMC_41555699","title":"Transcriptional Activation of EGFL6 by E2F8 Promotes Proliferation, Migration, and Invasion in Endometrial Carcinoma Cell.","date":"2026","source":"Biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/41555699","citation_count":0,"is_preprint":false},{"pmid":"41639725","id":"PMC_41639725","title":"KNTC1 initiates a KNTC1/E2F8/MYC positive feedback loop to facilitate tumorigenesis and enhance chemoresistance in bladder cancer.","date":"2026","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/41639725","citation_count":0,"is_preprint":false},{"pmid":"41268575","id":"PMC_41268575","title":"Bioinformatics insights into TMPO-AS1-let-7b-5p-ESPL1/E2F8 regulatory axis in breast cancer.","date":"2025","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/41268575","citation_count":0,"is_preprint":false},{"pmid":"42140448","id":"PMC_42140448","title":"PAFAH1B3 promotes gastric cancer progression by enhancing E2F8-mediated transcriptional activation of VEGFA expression.","date":"2026","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/42140448","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.07.31.667940","title":"Diploid Hepatocytes Resist Acetaminophen-Induced Liver Injury Through Suppressed JNK Signaling","date":"2025-08-02","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.31.667940","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.02.23.639703","title":"Cdk1 and PP2A constitute a molecular switch controlling orderly degradation of atypical E2Fs","date":"2025-02-23","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.23.639703","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.01.601538","title":"EFL-3/E2F7 modulates Wnt signalling through repressing the LIT-1 Nemo-like kinase during asymmetric epidermal cell division in  <i>Caenorhabditis elegans</i>","date":"2024-07-03","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.01.601538","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":35055,"output_tokens":9135,"usd":0.121095,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":19247,"output_tokens":3350,"usd":0.089993,"stage2_stop_reason":"end_turn"},"total_usd":0.211088,"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\": 2005,\n      \"finding\": \"E2F8 contains two distinct DNA-binding domains (unlike canonical E2Fs), binds DNA without DP co-factors, lacks DP-dimerization/retinoblastoma-binding/transcriptional activation domains, and functions as a transcriptional repressor that inhibits E2F-driven promoters and slows cell proliferation when overexpressed in primary MEFs.\",\n      \"method\": \"Sequence analysis, recombinant protein DNA-binding assay, promoter reporter assays, overexpression in primary mouse embryonic fibroblasts\",\n      \"journal\": \"The Journal of biological chemistry / Nucleic acids research / Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — independently replicated across three labs (PMID 15722552, 16179649, 15897886) using in vitro DNA-binding assays, reporter assays, and functional proliferation readouts\",\n      \"pmids\": [\"15722552\", \"16179649\", \"15897886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The integrity of both DNA-binding domains of E2F8 is required for DNA binding; mutations disrupting either domain abolish DNA binding activity.\",\n      \"method\": \"Active-site/domain mutagenesis, DNA-binding assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — mutagenesis with functional readout but single lab, single paper\",\n      \"pmids\": [\"15897886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"E2F8 can homodimerize and is expressed in the same adult tissues as E2F7, suggesting overlapping roles; E2F8 overexpression significantly slows proliferation of primary MEFs.\",\n      \"method\": \"Co-immunoprecipitation (homodimerization), overexpression proliferation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP for dimerization confirmed in two independent papers, proliferation assay replicated\",\n      \"pmids\": [\"15722552\", \"16179649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"E2F7 and E2F8 form homo- and heterodimers that occupy target gene promoters (including E2f1) and act as transcriptional repressors; combined loss of E2f7 and E2f8 (but not either alone) causes massive apoptosis and embryonic lethality. Genetic suppression by loss of E2f1 or p53 rescues apoptosis, placing E2F7/E2F8 upstream of the E2F1–p53 apoptotic axis.\",\n      \"method\": \"Mouse knockout genetics (E2f7 and E2f8 single and double knockouts), chromatin immunoprecipitation (ChIP) on target promoters, epistasis (E2f1 and p53 loss-of-function rescue)\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vivo double knockout with defined phenotype, ChIP for promoter occupancy, genetic epistasis with multiple suppressor alleles in a single rigorous study\",\n      \"pmids\": [\"18194653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"E2F7 and E2F8 are induced by DNA-damaging agents, bind the E2F1 promoter as a DNA-binding complex, repress E2F1 expression, and are required for cell-cycle effects of the DNA-damage response; depletion of either subunit increases E2F1 expression and prevents DNA-damage-induced cell-cycle arrest.\",\n      \"method\": \"ChIP on E2F1 and other E2F-responsive gene promoters, siRNA knockdown with cell-cycle and E2F1 expression readouts\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal occupancy by ChIP and functional knockdown with defined cell-cycle phenotype, two orthogonal methods\",\n      \"pmids\": [\"18202719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In a yeast expression system, E2F8 activates heterotrimeric G proteins as a guanine nucleotide exchange factor (GEF) for Gαi; epistasis showed E2F8 acts at the level of G proteins (not receptors), is antagonized by the GTPase-activating protein RGS4, and the first 200 N-terminal residues carry most activity.\",\n      \"method\": \"Yeast expression cloning, epistasis with Gα subunits and RGS4, receptor-independent activation assay\",\n      \"journal\": \"Journal of molecular signaling\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, heterologous yeast system; biological relevance in mammalian cells not established\",\n      \"pmids\": [\"17394670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"E2F8 is required for hepatocyte binucleation and polyploidization in mice; E2f8 deficiency leads to increased expression of E2F target genes that promote cytokinesis, preventing polyploidization. E2F8 and E2F1 occupy the same subset of target promoters with opposing effects (E2F8 represses, E2F1 activates); loss of E2f1 enhances polyploidization and suppresses the E2f8-deficiency polyploidization defect.\",\n      \"method\": \"Mouse liver-specific knockout (E2f8 and E2f1 loss-of-function), ChIP on target promoters, epistasis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout with defined polyploidization phenotype, ChIP for promoter co-occupancy, genetic epistasis with E2f1 rescuing the E2f8 phenotype\",\n      \"pmids\": [\"23064264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"E2F7 and E2F8 directly bind and transcriptionally activate the VEGFA promoter in a HIF1-dependent complex, independent of canonical E2F binding elements, thereby promoting angiogenesis; simultaneous deletion of E2F7/8 in zebrafish and mice causes severe vascular defects.\",\n      \"method\": \"VEGFA promoter reporter assay, ChIP, zebrafish and mouse double knockout with vascular phenotype readout\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — promoter reporter + ChIP + two model organism knockouts; replicated across species with consistent vascular phenotype\",\n      \"pmids\": [\"22903062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"E2F8 binds regulatory elements of the cyclin D1 (CCND1) promoter and activates its transcription, promoting S-phase accumulation in hepatocellular carcinoma cells.\",\n      \"method\": \"ChIP, promoter reporter assay, overexpression and knockdown with cell-cycle and gene expression readouts\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP combined with reporter assay and functional cell-cycle readout, single lab\",\n      \"pmids\": [\"20068156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rb and E2F8 co-suppress E2F target genes critical for DNA replication during erythroid terminal differentiation; loss of both Rb and E2f8 synergizes to increase E2F2 binding to target promoters and causes stressed DNA replication, DNA damage, and defective erythropoiesis rescued by inactivation of E2f2.\",\n      \"method\": \"Erythroid-specific Rb and E2f8 conditional knockouts, gene expression profiling, ChIP, epistasis with E2f2\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo double conditional KO with ChIP and E2f2 epistasis rescue across multiple orthogonal methods\",\n      \"pmids\": [\"24865965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"E2F8 directly binds the UHRF1 promoter and activates its transcription in lung cancer cells, as determined by ChIP and promoter activity assays; E2F8 depletion reduces UHRF1 expression and inhibits tumor growth.\",\n      \"method\": \"ChIP, promoter reporter assay, siRNA knockdown, xenograft tumor growth\",\n      \"journal\": \"Journal of the National Cancer Institute\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assay plus in vivo xenograft, single lab\",\n      \"pmids\": [\"26089541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"E2F8 is highly expressed in decidual cells in mice, is regulated by progesterone through the HB-EGF/EGFR/ERK/STAT3 signaling pathway, and transcriptionally suppresses CDK1, thereby triggering polyploidization of decidual cells.\",\n      \"method\": \"In vivo mouse decidualization model, signaling pathway inhibitor studies, ChIP/gene expression analysis of CDK1\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional in vivo model with pathway dissection and CDK1 as transcriptional target, single lab\",\n      \"pmids\": [\"25892397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"E2F8 promotes FABP3 expression in liver during diet-induced obesity in zebrafish; E2f8 morpholino knockdown suppresses fabp3 expression and ameliorates hepatic steatosis, and E2F8 overexpression in human HepG2 cells promotes FABP3 expression.\",\n      \"method\": \"Morpholino knockdown in zebrafish, overexpression in human HepG2 cells, transcriptome/proteome analysis\",\n      \"journal\": \"Nutrition & metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — in vivo morpholino plus human cell overexpression with two orthogonal methods\",\n      \"pmids\": [\"26052340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"E2F8's DNA-binding activity is essential for its tumor suppressor function in postnatal liver; disruption of E2F8 DNA-binding domain phenocopies E2f8 null allele and leads to HCC. Combined hepatocyte-specific deletion of E2f7 and E2f8 causes HCC, with E2F8's critical tumor suppressor window during the first 2 weeks of postnatal life.\",\n      \"method\": \"Conditional knockout mice (temporal-specific ablation), DNA-binding domain mutant knock-in, chromatin occupancy profiling (ChIP-seq), gene expression profiling\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vivo knockout, DNA-binding domain mutagenesis phenocopy, ChIP-seq for target identification, multiple alleles tested\",\n      \"pmids\": [\"27454291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"E2F8 directly binds the CCNE1 and CCNE2 promoters and transcriptionally upregulates their expression, accelerating G1-to-S phase transition in breast cancer cells.\",\n      \"method\": \"ChIP, promoter reporter assay, overexpression and knockdown with cell-cycle readout\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus promoter reporter plus functional cell-cycle assay, single lab\",\n      \"pmids\": [\"26992224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"E2F8 directly binds the MASTL promoter (validated by dual luciferase assay and ChIP-qPCR) and transcriptionally activates MASTL; E2F8 overexpression alleviates cisplatin-induced G2/M arrest by promoting MASTL-mediated mitotic entry, an effect cancelled by MASTL inhibition.\",\n      \"method\": \"Dual luciferase assay, ChIP-qPCR, overexpression/inhibition experiments with cell-cycle readout\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase reporter plus functional rescue, single lab\",\n      \"pmids\": [\"28605876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RNA-binding protein NONO post-transcriptionally regulates E2F8 expression by binding to E2F8 mRNA, as shown by RNA immunoprecipitation-sequencing (RIP-seq); NONO knockdown reduces E2F8 protein levels and suppresses breast cancer cell proliferation.\",\n      \"method\": \"RIP-sequencing, expression microarray integration, siRNA knockdown of NONO\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq plus functional knockdown, single lab with two orthogonal methods\",\n      \"pmids\": [\"31733123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"E2F8 protein degradation is controlled throughout the cell cycle by an interlocking dephosphorylation switch: Cdk1 phosphorylation promotes APC/CCdh1-dependent degradation at mitotic exit; PP2A dephosphorylation coupled to the G1 phase allows E2F8 accumulation; Cyclin F regulates E2F8 specifically in G2 phase.\",\n      \"method\": \"Human cell-free systems reconstituting inter-mitotic and G1 phases, APC/C degradation assays, phosphorylation analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cell-free reconstitution with multiple defined cell cycle stages, multiple kinase/phosphatase perturbations, F-box protein identification\",\n      \"pmids\": [\"31995441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"E2F8 is a transcriptional regulator of gluconeogenesis in primary mouse hepatocytes; adenovirus-mediated E2F8 overexpression upregulates PGC-1α, PEPCK, and G6Pase expression and increases glucose output, while E2F8 knockdown increases insulin sensitivity.\",\n      \"method\": \"Adenovirus-mediated overexpression, siRNA knockdown, glucose output assays, gene expression analysis in primary mouse hepatocytes and diabetic mouse models\",\n      \"journal\": \"Biochemistry. Biokhimiia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — primary hepatocyte experiments with both gain- and loss-of-function and defined metabolic readouts, single lab\",\n      \"pmids\": [\"31870257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"E2F8 knockdown in pancreatic beta cells (MIN6) reduces Abcc8 (KATP channel subunit) expression by ~30%, impairing ATP-sensitive K+ channel-dependent insulin secretion.\",\n      \"method\": \"siRNA knockdown in MIN6 cells, gene expression analysis, insulin secretion assay\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — loss-of-function with defined molecular mechanism (Abcc8/KATP), single lab\",\n      \"pmids\": [\"32356104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"E2F8 functions as a transcriptional repressor of Il9 in CD4+ T cells; TGF-β and IL-4 signaling induces pSmad3L-Ser213 via p38, which is necessary for Il9 transcription, and E2F8 represses this Il9 transcription. siRNA-mediated knockdown of E2f8 promotes tumor growth in mouse tumor models, while knockdown of Dbp (activator) suppresses it.\",\n      \"method\": \"siRNA knockdown in Th9 differentiation, mouse tumor models, Smad3 phosphorylation analysis, Il9 promoter studies\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo tumor models plus defined signaling pathway, single lab with functional and mechanistic readouts\",\n      \"pmids\": [\"36241625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"E2F8 directly binds the RRM2 promoter and transcriptionally activates RRM2 expression in lung adenocarcinoma cells; E2F8-driven RRM2 upregulation promotes DNA synthesis and cell cycle progression; E2F8 knockdown combined with WEE1 inhibitor MK-1775 synergistically suppresses tumor growth.\",\n      \"method\": \"Reporter gene assay, ChIP-qPCR, DNA pulldown-Western blot, overexpression/knockdown, in vitro and in vivo xenograft experiments\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — three orthogonal methods (reporter, ChIP-qPCR, DNA pulldown) confirming direct promoter binding plus in vivo xenograft validation\",\n      \"pmids\": [\"37863324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"E2F8 directly binds the NUSAP1 promoter and activates its transcription (confirmed by ChIP and dual-luciferase assay); E2F8-mediated NUSAP1 upregulation inhibits cisplatin-induced DNA damage and enhances cisplatin resistance in HCC cells.\",\n      \"method\": \"ChIP, dual-luciferase reporter assay, overexpression/knockdown, comet assay, flow cytometry\",\n      \"journal\": \"International journal of toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase reporter plus functional rescue, single lab\",\n      \"pmids\": [\"37331996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"E2F8 directly binds the CENPL promoter and transcriptionally activates CENPL expression; E2F8-CENPL axis promotes homologous recombination DNA repair and confers chemoresistance; CENPL overexpression partially rescues DNA damage repair defects caused by E2F8 knockdown.\",\n      \"method\": \"ChIP, reporter assay, knockdown/overexpression, HR repair assay, drug sensitivity assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional rescue with defined HR repair readout, single lab\",\n      \"pmids\": [\"38522807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IGF-I activates the PI3K/AKT pathway to upregulate E2F8, which transcriptionally activates RAD51 expression to promote homologous recombination repair and protect granulosa cells from hypoxia-induced apoptosis.\",\n      \"method\": \"PI3K/AKT pathway inhibition, E2F8 knockdown/overexpression, RAD51 promoter analysis, HR repair assay, apoptosis assay in porcine granulosa cells\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — pathway dissection with multiple inhibitors plus E2F8 as identified transcriptional regulator of RAD51, single lab\",\n      \"pmids\": [\"38095232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"E2F8 directly binds the PDK1 promoter (validated by dual-luciferase and ChIP) and transcriptionally activates PDK1; E2F8/PDK1 axis mediates DNA damage repair to promote cisplatin resistance in lung adenocarcinoma.\",\n      \"method\": \"Dual-luciferase assay, ChIP, overexpression/knockdown, DNA damage assay (comet, γ-H2AX), NHEJ reporter, xenograft\",\n      \"journal\": \"Pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase plus multiple functional readouts, single lab\",\n      \"pmids\": [\"38810606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"E2F8 transcriptionally activates ENO1 expression (confirmed by ChIP and RNA-seq) and promotes trophoblast invasion by inhibiting SFRP1/4 to activate Wnt signaling.\",\n      \"method\": \"ChIP, plasmid transfection, RNA-seq, western blotting, transwell invasion assay, immunofluorescence\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional invasion assay with pathway identification, single lab\",\n      \"pmids\": [\"38661062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"E2F8 directly activates androgen receptor (AR) transcription; the marine compound manzamine A blocks E2F8-DNA interactions, suppressing E2F8-dependent AR and AR-V7 synthesis in prostate cancer cells and reducing tumor growth in xenograft models.\",\n      \"method\": \"RNA-seq, protein modeling of E2F8-DNA interaction, cell line and xenograft experiments with manzamine A, AR expression analysis\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — RNA-seq plus structural modeling plus in vivo xenograft, but E2F8-DNA interaction evidence is primarily computational with functional corroboration\",\n      \"pmids\": [\"38605607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KNTC1 physically binds E2F8 protein and facilitates its nuclear translocation, enhancing E2F8-mediated transcriptional activation of MYC; MYC in turn transcriptionally upregulates KNTC1, forming a positive feedback loop driving PI3K/AKT/mTOR activation in bladder cancer.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, luciferase reporter assay, nuclear fractionation, gene knockdown/overexpression, xenograft\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus ChIP plus functional readout, but single lab and very recent paper\",\n      \"pmids\": [\"41639725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"E2F8 promotes TJP1 transcription (Halo-E2F8 overexpression increases TJP1 expression and transcription); TJP1 suppresses extravillous trophoblast invasion. Loss of E2F8 increases trophoblast invasiveness through reduced TJP1 and increased MMP-1 production.\",\n      \"method\": \"E2F8 overexpression (Halo-tagged), E2F8 shRNA knockdown, TJP1 knockdown/overexpression, invasion assay, MMP-1 measurement\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Halo-E2F8 overexpression driving TJP1 transcription plus functional invasion assay, single lab\",\n      \"pmids\": [\"38795825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"E2F8 transcriptionally activates TPX2 expression; E2F8-TPX2 axis promotes glycolysis and angiogenesis, cancer progression, and reduces cisplatin and apatinib sensitivity in liver cancer cells.\",\n      \"method\": \"Bioinformatics plus qRT-PCR, CCK-8, Transwell, flow cytometry, angiogenesis assay, E2F8 overexpression reversing TPX2 knockdown effects\",\n      \"journal\": \"Cytotechnology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — primarily bioinformatics-driven with cell-based rescue experiments; no direct ChIP/reporter confirming E2F8 binding to TPX2 promoter described in abstract\",\n      \"pmids\": [\"39435417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"E2F8 directly binds the MCM7 promoter and activates MCM7 transcription (confirmed by ChIP); MCM7 overexpression rescues the suppressive effects of E2F8 knockdown on bladder cancer cell malignant phenotypes.\",\n      \"method\": \"ChIP on MCM7 promoter, overexpression rescue experiment, knockdown with proliferation/invasion assays\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional rescue, single lab\",\n      \"pmids\": [\"39601318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"E2F8 is a direct APC/C substrate; flexible N-terminal domains contain APC/C recognition motifs adjacent to critical Thr residues whose phosphorylation by Cdk1 is rate-limiting for degradation; PP2A dephosphorylation of these residues acts as a molecular switch coupling E2F8 and E2F7 degradation to the G1 phase, coinciding with the rise of E2F1.\",\n      \"method\": \"Cell-free systems (inter-mitotic, G1, and prometaphase-to-G1 transitions), Cdk1 and PP2A activity perturbations, APC/C degradation assays, domain mutagenesis\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cell-free reconstitution with defined enzymatic perturbations and mutagenesis; extends published PMID 31995441 findings with additional mechanistic resolution, single lab preprint\",\n      \"pmids\": [\"bio_10.1101_2025.02.23.639703\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"E2F8 transcriptionally activates SPC25 expression (confirmed by dual-luciferase and ChIP); E2F8/SPC25 axis promotes glutamine metabolism to facilitate immune escape in lung adenocarcinoma; SPC25 overexpression rescues immune escape suppression caused by E2F8 knockdown.\",\n      \"method\": \"Dual-luciferase assay, ChIP, E2F8/SPC25 knockdown/overexpression, co-culture immune assay, glutamine metabolism measurements\",\n      \"journal\": \"Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase plus functional immune escape rescue, single lab\",\n      \"pmids\": [\"39829079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"E2F8 transcriptionally activates GRPEL2 expression (confirmed by luciferase reporter and ChIP assays); E2F8/GRPEL2 axis promotes colorectal cancer progression through mitochondrial dysregulation; TIGAR interacts with GRPEL2 protein (co-IP) as a downstream effector.\",\n      \"method\": \"Luciferase reporter, ChIP, Co-IP (GRPEL2-TIGAR interaction), knockdown/overexpression, in vivo metastasis model\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter plus co-IP of downstream effector, single lab\",\n      \"pmids\": [\"40269881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"E2F8 transcriptionally activates DTL expression by binding its promoter; E2F8/DTL axis activates the MAPK signaling pathway in endometrial cancer; DTL knockdown enhances PDCD4 ubiquitination; DTL overexpression or PDCD4 knockdown rescues the growth-suppressive effects of E2F8 knockdown.\",\n      \"method\": \"ChIP, bioinformatics, functional assays (proliferation, migration, invasion), xenograft, ubiquitination assay\",\n      \"journal\": \"Reproductive sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional rescue with MAPK pathway and ubiquitination readouts, single lab\",\n      \"pmids\": [\"41461624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"E2F8 transcriptionally activates EGFL6 by binding its promoter (confirmed by dual luciferase assay); EGFL6 overexpression rescues proliferation, migration, and invasion suppressed by E2F8 knockdown in endometrial cancer cells.\",\n      \"method\": \"Dual luciferase assay, shRNA knockdown, overexpression rescue, CCK-8 and Transwell assays, xenograft\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter plus functional rescue with defined pathway, single lab\",\n      \"pmids\": [\"41555699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"E2F8 coordinates with PAFAH1B3 to promote VEGFA transcription in gastric cancer cells; VEGFA overexpression rescues defects caused by PAFAH1B3 knockdown; in vivo xenograft experiments confirm VEGFA as a downstream effector of this pathway.\",\n      \"method\": \"Transcriptomic profiling, VEGFA overexpression rescue, xenograft, PAFAH1B3 knockdown\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — transcriptomic approach with rescue experiment; direct E2F8 binding to VEGFA promoter in this context is not independently confirmed with ChIP in the abstract\",\n      \"pmids\": [\"42140448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"E2F8 transcriptionally activates RRM2 expression in gallbladder cancer; E2F8-RRM2 axis drives gemcitabine resistance; a small-molecule HIT-4 identified by virtual screening disrupts E2F8-DNA interaction, reduces RRM2 expression, and synergizes with PARP inhibitors to suppress tumor growth in vivo and in patient-derived organoids.\",\n      \"method\": \"CRISPR-Cas9 genome-wide knockout screen, ChIP (implied by context of E2F8-RRM2 transcriptional regulation), virtual screening, cell viability/apoptosis assays, xenograft, patient-derived organoids\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide screen plus in vivo and PDO validation, single lab; mechanistic E2F8-DNA binding confirmed with small-molecule disruption\",\n      \"pmids\": [\"41392282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In AR-negative castration-resistant prostate cancer, E2F8 non-canonically activates (rather than represses) target oncogenes; CRISPR/CasRx-mediated knockdown of E2F8 downregulates target oncogenes and inhibits AR-negative CRPC growth in vitro and in xenograft models.\",\n      \"method\": \"E2F8 cistrome profiling (ChIP-seq), transcriptome profiling (RNA-seq), CRISPR/CasRx knockdown, xenograft model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — integrative ChIP-seq plus RNA-seq plus in vivo CRISPR knockdown with defined growth phenotype, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"39613933\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"E2F8 is an atypical E2F transcription factor with two tandem DNA-binding domains that binds DNA and represses transcription independently of DP dimerization partners or retinoblastoma protein; it forms homo- and heterodimers with E2F7 to repress E2F1 and downstream cell cycle targets, thereby controlling cell proliferation, embryonic development, hepatocyte polyploidization, and the DNA-damage response. E2F8 protein levels oscillate across the cell cycle through APC/CCdh1-mediated ubiquitin-dependent degradation triggered by Cdk1 phosphorylation and reversed by PP2A, with additional regulation by Cyclin F in G2. Beyond canonical repression, context-dependent transcriptional activation of targets including VEGFA (with HIF1), CCND1, CCNE1/2, RRM2, UHRF1, MASTL, RAD51, and others has been established by ChIP and reporter assays, and in AR-negative prostate cancer E2F8 acts non-canonically as a transcriptional activator of oncogenes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"E2F8 is an atypical E2F-family transcription factor that controls cell proliferation, embryonic development, and the DNA-damage response through a non-canonical mode of DNA binding [#0, #3]. Unlike canonical E2Fs, it contains two tandem DNA-binding domains—both required for DNA occupancy—and binds DNA independently of DP partners and retinoblastoma protein, lacking the dimerization and activation domains those proteins require [#0, #1]. It homodimerizes and forms heterodimers with the related E2F7, and the two together occupy target promoters as a repressive DNA-binding complex; concurrent loss of E2f7 and E2f8 (but neither alone) causes massive apoptosis and embryonic lethality that is rescued by removal of E2f1 or p53, placing the E2F7/E2F8 complex upstream of the E2F1–p53 axis [#2, #3]. As a repressor, E2F8 is induced by DNA damage to silence the E2F1 promoter and enforce cell-cycle arrest, antagonizes the proliferation-promoting activities of activator E2Fs by co-occupying shared promoters with opposing effect, and drives hepatocyte and decidual polyploidization by suppressing cytokinesis genes such as CDK1 [#4, #6, #11]. In the liver this repressive program constitutes a tumor-suppressor function whose loss—or disruption of the DNA-binding domain—causes hepatocellular carcinoma [#13]. E2F8 protein abundance oscillates across the cell cycle: Cdk1 phosphorylation of N-terminal threonines adjacent to APC/C recognition motifs licenses APC/C^Cdh1-dependent degradation at mitotic exit, PP2A dephosphorylation couples its accumulation to G1, and Cyclin F provides additional G2 control [#17]. Beyond repression, E2F8 acts context-dependently as a transcriptional activator: with HIF1 it directly activates VEGFA to drive angiogenesis [#7], and across diverse cancers it directly binds and activates cell-cycle, replication, and DNA-repair genes including CCND1, CCNE1/2, RRM2, UHRF1, MASTL, and RAD51 to promote proliferation, DNA repair, and chemoresistance [#8, #10, #14, #21, #24]. In AR-negative castration-resistant prostate cancer this activator role dominates, with E2F8 driving an oncogenic cistrome [#39].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established that E2F8 is a structurally distinct E2F that binds DNA and represses transcription without the dimerization and Rb-binding machinery of canonical family members, defining it as an atypical repressor.\",\n      \"evidence\": \"Sequence analysis, recombinant DNA-binding assays, promoter reporters, and overexpression in primary MEFs; domain mutagenesis showing both DNA-binding domains are required\",\n      \"pmids\": [\"15722552\", \"16179649\", \"15897886\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous target gene set not yet defined\", \"Physiological partners beyond homodimer not yet identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved how E2F8 acts in vivo by showing it functions as an E2F7/E2F8 repressor complex that restrains the E2F1–p53 apoptotic axis, explaining its essential role in development.\",\n      \"evidence\": \"E2f7/E2f8 single and double knockout mice, ChIP on the E2f1 promoter, and genetic epistasis with E2f1 and p53 loss-of-function\",\n      \"pmids\": [\"18194653\", \"18202719\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of homo- versus hetero-dimer choice unknown\", \"How DNA damage induces E2F7/8 not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected E2F8 repression to physiological ploidy control and to context-dependent activation, showing it suppresses cytokinesis genes to drive hepatocyte polyploidization yet co-activates VEGFA with HIF1.\",\n      \"evidence\": \"Liver-specific E2f8 knockout with E2f1 epistasis and promoter ChIP; VEGFA reporter, ChIP, and zebrafish/mouse double knockouts with vascular phenotypes\",\n      \"pmids\": [\"23064264\", \"22903062\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular switch between repressive and activating modes unresolved\", \"How HIF1 redirects E2F8 to non-canonical elements unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated that E2F8's DNA-binding activity is the basis of a bona fide tumor-suppressor function with a defined developmental window, by knock-in phenocopy of the null allele.\",\n      \"evidence\": \"Temporal conditional knockouts, DNA-binding-domain mutant knock-in, and ChIP-seq in postnatal liver\",\n      \"pmids\": [\"27454291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why the tumor-suppressor window is restricted to early postnatal life is unexplained\", \"Genome-wide target overlap with E2F7 in liver not fully mapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined how E2F8 protein levels are timed across the cell cycle, identifying a Cdk1/PP2A phospho-switch that gates APC/C^Cdh1-dependent degradation, with Cyclin F adding G2 control.\",\n      \"evidence\": \"Human cell-free systems reconstituting inter-mitotic and G1 phases with kinase/phosphatase perturbations and APC/C degradation assays\",\n      \"pmids\": [\"31995441\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo physiological consequence of mis-timed degradation untested\", \"Precise degron and phospho-site mapping deferred to later work\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Broadened the activator role of E2F8 by showing direct activation of replication/repair effectors that drive proliferation and chemoresistance across multiple cancers.\",\n      \"evidence\": \"ChIP-qPCR, reporter and DNA-pulldown assays plus knockdown/xenograft for RRM2, RAD51, CENPL, and others\",\n      \"pmids\": [\"37863324\", \"38522807\", \"38095232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors that convert E2F8 to an activator in cancer not identified\", \"Whether activation requires displacement of the E2F7/8 repressor complex unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed that in AR-negative castration-resistant prostate cancer E2F8 operates predominantly as a transcriptional activator of an oncogenic cistrome, establishing a lineage-specific reversal of its canonical repressor identity.\",\n      \"evidence\": \"E2F8 ChIP-seq and RNA-seq integration with CRISPR/CasRx knockdown and xenograft growth readouts\",\n      \"pmids\": [\"39613933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chromatin context driving activation versus repression not defined\", \"Generality across other AR-negative tumors untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined the degradation model by mapping APC/C recognition motifs and Cdk1-phosphorylated threonines in flexible N-terminal domains, showing PP2A acts as the molecular switch coupling E2F8/E2F7 turnover to G1 and the rise of E2F1.\",\n      \"evidence\": \"Cell-free reconstitution across mitotic-to-G1 transitions with Cdk1/PP2A perturbations and degron mutagenesis (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.02.23.639703\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Preprint not yet peer-reviewed\", \"Structural basis of APC/C engagement not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular determinant that toggles E2F8 between an E2F7-partnered repressor and a context-dependent transcriptional activator remains unresolved.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No defined cofactor or modification that switches repression to activation\", \"Relationship between activator cistromes and the canonical E2F7/8 repressive complex unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3, 7, 21, 39]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 6, 14, 17]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 3, 7]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [4, 24, 23]}\n    ],\n    \"complexes\": [\"E2F7/E2F8 repressor complex\"],\n    \"partners\": [\"E2F7\", \"HIF1\", \"KNTC1\", \"PAFAH1B3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}