{"gene":"MCM7","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1999,"finding":"The MCM4-MCM6-MCM7 complex has intrinsic DNA helicase activity. Mutation of conserved ATPase motifs in MCM6 abolished helicase activity, indicating MCM6 ATP binding is critical. MCM4 contributes to single-stranded DNA binding activity of the complex, and these two activities (helicase and ssDNA binding) can be separated.","method":"In vitro helicase assay with purified recombinant complexes from insect cells; ATPase motif mutagenesis of MCM4 and MCM6","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro helicase assay with mutagenesis of catalytic residues, multiple orthogonal methods in a single rigorous study","pmids":["10567526"],"is_preprint":false},{"year":2002,"finding":"Conserved ATPase motifs of MCM7 are essential for both ATPase and DNA helicase activities of the MCM4/6/7 complex. Uncomplexed MCM7 alone displays neither ATPase nor DNA helicase activity, indicating MCM7 contributes to helicase activity only through interaction with other subunits. A zinc finger mutant of MCM4 with impaired DNA binding showed elevated helicase activity and tended to dissociate into trimeric complexes, suggesting MCM4 zinc finger is involved in subunit interactions.","method":"In vitro ATPase and DNA helicase assays; site-directed mutagenesis of MCM7 ATPase motifs and MCM4 zinc finger; gel filtration analysis of complex assembly","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro enzymatic assays with mutagenesis of multiple subunits, multiple orthogonal approaches","pmids":["12207017"],"is_preprint":false},{"year":2004,"finding":"MCM7 and CDC45 are required throughout DNA replication elongation in vertebrates, not just initiation. Neutralization of MCM7 using an Rb(1-400) fragment and Cdc45 antibodies both abolished chromosome unwinding by the uncoupled helicase (in aphidicolin-treated extracts), providing direct evidence that the MCM2-7 complex is the replicative DNA helicase and that Cdc45 is a helicase co-factor.","method":"Xenopus egg extract DNA replication assay; functional inhibition with Rb(1-400) fragment and anti-Cdc45 antibodies; aphidicolin-induced helicase uncoupling assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted cell-free replication system with two independent inhibitors giving concordant results, multiple functional readouts","pmids":["15329670"],"is_preprint":false},{"year":1998,"finding":"The retinoblastoma protein (Rb) directly interacts with MCM7 via the Rb amino-terminus (residues 1-400) binding the C-terminal 137 amino acids of MCM7. Rb-related proteins p107 and p130 also bind MCM7. The Rb amino-terminus strongly inhibited DNA replication in an MCM7-dependent fashion in a Xenopus in vitro replication assay, establishing that Rb negatively regulates DNA replication through direct interaction with MCM7.","method":"Yeast two-hybrid screen; in vitro binding assay; anti-Rb co-immunoprecipitation from human cells; Xenopus in vitro DNA replication assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vitro binding, and functional replication assay with multiple orthogonal methods across two experimental systems","pmids":["9566894"],"is_preprint":false},{"year":1995,"finding":"Yeast Cdc47 (MCM7 ortholog) undergoes cell cycle-regulated nuclear import and export: it enters the nucleus at mitosis, remains there until the initiation of DNA replication, then is rapidly exported to the cytoplasm at the start of S phase. Cdc47 protein levels do not vary with the cell cycle but expression and nascent synthesis peak in late M phase.","method":"Indirect immunofluorescence microscopy; subcellular fractionation; CDC47 gene isolation by complementation of temperature-sensitive mutant","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent localization methods (immunofluorescence + fractionation) with cell cycle staging, complementation genetic validation","pmids":["7708676"],"is_preprint":false},{"year":2004,"finding":"Human MCM7 physically interacts with hRad17 and is required for replication checkpoint signaling. Depletion of either hRad17 or hMCM7 by siRNA suppressed UV- or aphidicolin-induced Chk1 phosphorylation and abolished UV-induced S-phase checkpoint activation. MCM7-depleted cells were defective for ATR nuclear foci formation after UV irradiation, indicating MCM7 is required for stable ATR recruitment to damaged DNA.","method":"Co-immunoprecipitation to identify hMCM7 as hRad17-interacting protein; siRNA knockdown; immunofluorescence for ATR foci; phospho-Chk1 immunoblotting","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus siRNA knockdown with multiple functional readouts (Chk1 phosphorylation, checkpoint activation, ATR foci) in a single study","pmids":["15538388"],"is_preprint":false},{"year":2003,"finding":"Cyclin D1/CDK4 binds to MCM7 and MCM3 in the pre-replication complex on chromatin. Active cyclin D1/CDK4 catalyzes dissociation of the RB·MCM7 complex and promotes removal of RB from chromatin-bound complexes, although cyclin D1/CDK4 does not phosphorylate MCM7 directly. Cyclin E/CDK2 did not replicate this effect.","method":"Co-immunoprecipitation; chromatin fractionation; in vitro kinase assay; RB·MCM7 complex dissociation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, chromatin fractionation, and in vitro kinase assay with kinase-inactive controls and comparison to cyclin E/CDK2","pmids":["12519773"],"is_preprint":false},{"year":2006,"finding":"Phosphorylation of MCM4 at Thr-19 and Thr-110 by CDK2/CDK1 inactivates the MCM4-MCM6-MCM7 helicase activity. EBV protein kinase (EBV-PK) phosphorylates these same sites plus additional sites on MCM4 and MCM6, also inactivating helicase activity. This mechanism accounts for blockade of chromosomal DNA replication during EBV lytic replication.","method":"In vitro helicase assay with purified MCM4-6-7 complex; phosphorylation site mapping; site-directed mutagenesis of MCM4 N-terminal Ser/Thr residues; EBV-PK expression in HeLa cells","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro helicase assay with mutagenesis and kinase assays, single lab with multiple orthogonal methods","pmids":["17005684"],"is_preprint":false},{"year":2005,"finding":"Polo-like kinase 1 (Plk1) interacts with MCM7 (and other MCM2-7 complex members) via its polo-box domain. Endogenous Plk1 co-immunoprecipitates with both basal and DNA damage-induced slower-migrating forms of Mcm7. The strongest interaction is in the soluble chromatin fraction, suggesting Plk1 coordinates DNA replication and mitotic events at chromatin.","method":"Polo-box domain pulldown screen; co-immunoprecipitation of endogenous proteins; subcellular fractionation (chromatin fraction)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — reciprocal Co-IP with fractionation, single lab, no functional rescue experiment","pmids":["15654075"],"is_preprint":false},{"year":2010,"finding":"Cyclin A promotes S-phase entry through direct interaction with MCM7. A cyclin A mutant (CycA-C1) that cannot bind MCM7 fails to promote S-phase entry. An Mcm7 mutant (Mcm7-3) that can bind CycA-C1 suppresses the S-phase entry defect of CycA-C1. Cyclin A and Mcm7 interact specifically in the chromatin fraction.","method":"Cyclin A mutant derivation; Mcm7 interaction screen; co-immunoprecipitation from chromatin fraction; RNAi knockdown and mutant rescue experiments; S-phase entry assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic suppression with matched cyclin A and MCM7 mutants, chromatin fractionation, RNAi rescue, multiple orthogonal methods","pmids":["21078875"],"is_preprint":false},{"year":2013,"finding":"MCM7 is phosphorylated at Ser-121 by cyclin E/CDK2 and cyclin B/CDK1. The MCM7-S121A mutant fails to efficiently form a pre-RC complex with MCM3/MCM5/Cdc45. Overexpression of wild-type MCM7 (but not S121A) blocks S-phase entry through activation of the Chk1/p53 checkpoint. MCM7-S121A overexpression causes M-phase exit delay, indicating that Ser-121 phosphorylation in M phase is important for proper mitotic exit.","method":"In vitro kinase assay (cyclin E/CDK2, cyclin B/CDK1); site-directed mutagenesis (S121A); Tet-On inducible overexpression; co-immunoprecipitation for pre-RC complex; cell cycle analysis; Chk1 phosphorylation western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay combined with mutagenesis, inducible expression system, and multiple cell cycle readouts in a single study","pmids":["23720738"],"is_preprint":false},{"year":2013,"finding":"Activated EGFR phosphorylates the p56 isoform of Lyn at Y32, which then phosphorylates MCM7 at Y600, increasing MCM7 association with other MCM complex proteins, thereby promoting DNA synthesis complex assembly and cell proliferation.","method":"Biochemical signaling cascade analysis; phospho-specific antibodies; co-immunoprecipitation; in vitro kinase assays; knockdown/overexpression in cancer cell lines","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assays establishing the EGFR→p56Lyn→MCM7 phosphorylation cascade, with Co-IP showing increased MCM complex assembly, multiple orthogonal methods","pmids":["23764002"],"is_preprint":false},{"year":2005,"finding":"The CDK inhibitor p27Kip1 directly binds the conserved MCM domain of MCM7. This interaction occurs in a growth factor-dependent manner in vivo. The C-terminal domain of p27Kip1 inhibits DNA replication through this MCM7 interaction, independently of its function as a CDK inhibitor.","method":"Co-immunoprecipitation; in vitro binding assay; domain mapping; DNA replication assay with C-terminal p27Kip1 domain","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP and in vitro binding with domain mapping, single lab, limited functional rescue","pmids":["16289477"],"is_preprint":false},{"year":2008,"finding":"MCM7 physically interacts with the androgen receptor (AR) both in vitro and in vivo. The AR-binding motif in MCM7 maps to amino acids 221-248, and the MCM7-binding motif in AR maps to amino acids 426-475. High doses of androgen (R1881) decreased MCM7 binding to genomic DNA, reduced DNA synthesis, and decreased S-phase entry; low doses increased MCM7 DNA licensing activity and proliferation. The MCM7/AR interaction down-regulated MCM7 expression, and AR transcriptional activity depended on its interaction with MCM7.","method":"Co-immunoprecipitation in vitro and in vivo; domain mapping by deletion mutants; DNA synthesis assay; FACS cell cycle analysis; MCM7 knockdown; AR mutant defective in MCM7 binding","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with domain mapping, functional assays using both gain and loss of function, multiple orthogonal readouts","pmids":["18988800"],"is_preprint":false},{"year":2007,"finding":"Human INT6 interacts with MCM7, and INT6 stabilizes chromatin-bound MCM7 protein. Proteasome inhibition strengthens the INT6–MCM7 interaction. In INT6-silenced cells, removal of MCM7 from chromatin during replication is accelerated, leading to reduced thymidine incorporation and reinforced RPA and claspin chromatin association, indicating replication deficiency.","method":"Yeast two-hybrid (INT6 as bait); co-immunoprecipitation; proteasome inhibitor treatment; chromatin fractionation; thymidine incorporation assay; siRNA depletion","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with chromatin fractionation and functional replication readout, single lab with multiple methods","pmids":["17310990"],"is_preprint":false},{"year":2000,"finding":"MAT1, the CDK-activating kinase assembly/targeting factor, physically interacts with MCM7. The C-terminal domain of MAT1 is required for this interaction (the RING finger is dispensable). MCM7 associates with the CAK complex in vivo in human osteosarcoma cells.","method":"Yeast two-hybrid screen; in vitro protein binding assay; co-immunoprecipitation from human MG63 cells","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — yeast two-hybrid confirmed by in vitro binding and Co-IP, single lab, no functional consequence demonstrated","pmids":["11056214"],"is_preprint":false},{"year":2003,"finding":"In S. cerevisiae, Mcm7 acts as a novel cofactor of Mcm1 to modulate its own expression. Mcm7 stimulates Mcm1 binding to the early cell cycle box (ECB) upstream of the MCM7, CDC6, and MCM5 promoters. Mcm7 is recruited to these promoters during late M phase, consistent with a direct role in regulating periodic expression of early cell cycle genes.","method":"Genetic analysis (mcm7-1 and mcm1-1 mutants); chromatin immunoprecipitation; in vitro DNA binding (Mcm1 binding stimulation by Mcm7); promoter reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus in vitro binding and genetic mutants, single lab with multiple methods","pmids":["12738768"],"is_preprint":false},{"year":2001,"finding":"In S. pombe, mcm7+ is essential for viability; loss of mcm7+ causes delayed S-phase entry and arrest with 2C DNA content. Mcm7p is a nuclear protein throughout the cell cycle, and its nuclear localization depends on the other MCM proteins. mcm7-98 is synthetically lethal with checkpoint mutants (Δcds1, Δchk1, Δrad3), suggesting chromosomal defects even at permissive temperature. Genetic evidence suggests the Mcm3p-Mcm5p dimer interacts with the Mcm4p-Mcm6p-Mcm7p core through Mcm7p.","method":"Genetic complementation; spore viability analysis; flow cytometry; immunofluorescence localization; synthetic lethality screens with checkpoint mutants","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic and cell biological approaches, single lab","pmids":["11606526"],"is_preprint":false},{"year":2013,"finding":"RACK1 interacts with MCM7 (binding motif at amino acids 221-248 of MCM7) and acts as a scaffold bringing Akt into proximity with MCM7. RACK1 overexpression increases Akt-dependent MCM7 phosphorylation, promotes MCM7 chromatin binding and MCM complex formation, thereby stimulating DNA replication. PKC activation by PMA redistributes RACK1 from nucleus to cytoplasm, decreasing MCM7 chromatin association and inducing growth arrest. An MCM7 mutant unable to bind RACK1 lacks DNA replication licensing and oncogenic transformation activity.","method":"Co-immunoprecipitation in vivo and in vitro; domain mapping; RACK1 knockdown; PKC activation; chromatin fractionation; DNA synthesis assay; oncogenic transformation assay","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with domain mapping, loss-of-function (knockdown + binding mutant), multiple functional readouts in a single study","pmids":["23313748"],"is_preprint":false},{"year":2017,"finding":"RACK1 mediates MCM7 phosphorylation by Akt in a ternary MCM7/RACK1/Akt signaling complex, increasing MCM7 chromatin binding and MCM complex formation to promote DNA replication and cell proliferation in non-small-cell lung cancer.","method":"Co-immunoprecipitation; overexpression; in vitro phosphorylation assay; chromatin fractionation; cell proliferation assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP with phosphorylation data and chromatin fractionation, single lab, independently corroborates PMID 23313748","pmids":["28465488"],"is_preprint":false},{"year":2019,"finding":"ATO suppresses MCM7 transcription by targeting the SRF/MCM7 complex, which functions as a transcriptional regulator of MCM7 expression in HCC. MCM7 knockdown recapitulates ATO effects on cancer stem cell traits and metastasis, while MCM7 overexpression abolishes these effects.","method":"Co-immunoprecipitation/complex identification; MCM7 promoter assays; MCM7 knockdown and overexpression; in vivo xenograft and metastasis models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying SRF/MCM7 transcriptional complex, gain and loss of function with in vivo validation, single lab","pmids":["31186405"],"is_preprint":false},{"year":2002,"finding":"MYCN directly transcriptionally activates MCM7 in neuroblastoma. Induction of MYCN increases endogenous MCM7 mRNA and protein levels (~3-fold). MCM7 promoter/luciferase reporter activity is significantly increased under MYCN-induced conditions, and specific EMSA shifts of MCM7 promoter sequences are detected in MYCN-amplified cell extracts.","method":"Microarray analysis; conditional MYCN induction; luciferase reporter assay; electrophoretic mobility shift assay (EMSA); western blot","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus luciferase reporter with conditional induction, single lab","pmids":["11861392"],"is_preprint":false},{"year":1998,"finding":"The human MCM7 promoter contains functional E2F binding sites and an E-box that are essential for promoter activity. Multiple transcription start sites are used upon growth stimulation. The minimal promoter requires an E-box and one E2F site for transcription.","method":"Promoter cloning; luciferase reporter assays; deletion analysis; identification of transcription start sites","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — promoter deletion analysis with reporter assays, single lab, no protein-DNA binding experiments shown","pmids":["9714754"],"is_preprint":false},{"year":2021,"finding":"Biallelic pathogenic variants in MCM7 cause autosomal recessive primary microcephaly and intellectual disability. Variants in MCM7 interfere with MCM complex formation and impair S-phase progression efficiency. The p.A265T missense variant is deleterious; overexpression of wild-type but not mutant MCM7 counterbalances the reduced cell viability/proliferation caused by Mcm7 knockdown in neuroblastoma cells.","method":"Exome/genome sequencing; functional studies: MCM complex formation assay; S-phase progression analysis; Mcm7 knockdown in mouse neuroblastoma cells; wild-type vs. mutant MCM7 rescue experiment","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — MCM complex formation assay + S-phase analysis + mutant rescue experiment, multiple orthogonal methods in a single study","pmids":["34059554"],"is_preprint":false},{"year":2017,"finding":"MCM7 depletion promotes mitotic exit by inhibiting CDK1 activity. MCM7 maintains chromatin association during M phase. MCM7 siRNA depletion leads to CDK1 inactivation, promotes cohesin/RAD21 cleavage, and accelerates sister chromatid segregation. MCM7 co-localizes with tubulin in mitotic cells and its depletion results in aberrant spindle formation.","method":"siRNA knockdown; CDK1 activity assay; cohesin/RAD21 cleavage immunoblot; immunofluorescence co-localization with tubulin; cell cycle analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — siRNA with CDK1 activity readout and immunofluorescence, single lab, limited mechanistic depth","pmids":["28588300"],"is_preprint":false},{"year":2017,"finding":"MCM7 overexpression strengthens the Cep68-VHL interaction at centrosomes, leading to Cep68 ubiquitination and proteasomal degradation, thereby causing centrosome splitting. MCM7 directly binds Cep68 in vitro and complexes with Cep68 and VHL in vivo. Absence of MCM7 weakens the Cep68-VHL interaction.","method":"In vitro binding assay (MCM7 with Cep68); co-immunoprecipitation (MCM7/Cep68/VHL); overexpression and knockdown; ubiquitination assay; immunofluorescence for centrosome splitting","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vitro binding confirmed by Co-IP with functional ubiquitination/centrosome readout, single lab","pmids":["28578000"],"is_preprint":false},{"year":2024,"finding":"SETD3 histidine methyltransferase methylates MCM7 at histidine-459 (H459me), and this modification is required for CDT1-mediated chromatin loading of the MCM complex and for replication origin firing. SETD3 depletion attenuates early replication origin firing. CDK2 phosphorylates SETD3 at Ser-21 during G1/S, which is required for this pathway. Impairment of H459 methylation on MCM7 attenuates DNA synthesis and MCM chromatin loading.","method":"Nascent-strand sequencing (NS-seq) for replication origin analysis; biochemical pulldown (SETD3 binds MCM); in vitro methylation assay (SETD3 on MCM7 H459); site-directed mutagenesis (H459A); CDT1-mediated chromatin loading assay; CDK2 phosphorylation of SETD3","journal":"Science China. Life sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro methylation assay with mutagenesis, NS-seq for replication origins, chromatin loading assay, multiple orthogonal methods in one study","pmids":["39455502"],"is_preprint":false},{"year":2024,"finding":"PLCE1 promotes MCM7 expression via PKCα-mediated phosphorylation of E2F1, which transcriptionally activates MCM7. Additionally, PLCE1 potentiates phosphorylation of MCM7 at six threonine residues by the atypical kinase RIOK2, promoting MCM complex assembly and chromatin loading. Inhibition of PLCE1 or RIOK2 impairs MCM7-mediated DNA replication, causing G1-S arrest.","method":"Phosphorylation site mapping (six Thr residues); kinase assay (RIOK2 on MCM7); MCM complex assembly co-immunoprecipitation; chromatin loading assay; E2F1 phosphorylation analysis; cell cycle assays; in vivo tumor models","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with site mapping, Co-IP for complex assembly, chromatin loading assay, and in vivo validation, multiple orthogonal methods","pmids":["38117512"],"is_preprint":false},{"year":2024,"finding":"The E3 ubiquitin ligase RNF8 catalyzes K63-linked multi-ubiquitination of MCM7 at K145, both in vitro and in vivo. This modification is dynamically regulated during the cell cycle, peaking on chromatin during late S phase. RNF168 and BRCA1 promote MCM7 polyubiquitylation during replication termination. Upon DNA damage, RNF8-mediated MCM7 polyubiquitination decreases significantly during late S phase, linking CMG helicase disassembly to DNA damage response.","method":"In vitro ubiquitination assay (RNF8 on MCM7); in vivo ubiquitination assay; K145 site mapping; cell cycle-staged chromatin fractionation; RNF168/BRCA1 co-transfection assays; DNA damage treatment","journal":"Life sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro and in vivo ubiquitination assays with site mapping by mutagenesis, cell cycle analysis, multiple orthogonal approaches","pmids":["39004272"],"is_preprint":false},{"year":2021,"finding":"PRMT5 physically interacts with MCM7; the direct binding domain in MCM7 maps to residues 1-248. Co-immunoprecipitation confirmed the physical interaction. MCM7 promotes CRC cell proliferation, migration, and invasion in vitro.","method":"Co-immunoprecipitation; domain mapping (MCM7 deletion constructs); siRNA/overexpression functional assays in CRC cells","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single Co-IP with domain mapping; functional data from knockdown/overexpression but no mechanistic link between PRMT5 binding and MCM7 function demonstrated","pmids":["33675123"],"is_preprint":false},{"year":2022,"finding":"MCM7 facilitates autolysosome formation by binding dynein, thereby promoting autophagic flux in bladder cancer stem-like cells. MCM7 knockdown inhibits autophagic flux, reduces stemness, and triggers AMPK activation leading to increased BCL2/BECLIN1 interaction and P53 accumulation.","method":"MCM7 knockdown; co-immunoprecipitation (MCM7 with dynein); autophagy/mitophagy flux assays; AMPK pathway analysis; mitochondrial respiration measurement","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP with dynein plus functional autophagic flux assay, single lab, non-canonical MCM7 function","pmids":["36111256"],"is_preprint":false},{"year":2025,"finding":"Histone lactylation at the MCM7 locus facilitates MCM7 transcriptional activation in hepatocellular carcinoma. Treatment with glycolysis inhibitor 2-DG decreases MCM7 mRNA and protein, while rotenone (glycolysis activator) increases them. Rescue experiments confirmed histone lactylation is necessary for MCM7-driven CSC properties and radio-resistance.","method":"2-DG and rotenone treatment; MCM7 knockdown/overexpression; spheroid formation assays; colony formation; xenograft model; rescue experiments with histone lactylation modulation","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — pharmacological modulation of lactylation with MCM7 rescue, single lab, no direct chromatin lactylation mapping at MCM7 locus reported in abstract","pmids":["40118288"],"is_preprint":false},{"year":2024,"finding":"E2F8 transcription factor binds the MCM7 promoter and activates MCM7 transcription. E2F8 knockdown suppresses bladder cancer cell proliferation and causes G1 arrest; MCM7 overexpression rescues these effects, placing E2F8 upstream of MCM7 in bladder cancer cell cycle regulation.","method":"Chromatin immunoprecipitation (E2F8 binding to MCM7 promoter); luciferase reporter assay; E2F8 knockdown; MCM7 overexpression rescue; in vivo xenograft model","journal":"Biochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP plus reporter assay with epistasis rescue experiment, single lab","pmids":["39601318"],"is_preprint":false},{"year":2024,"finding":"Splicing factor WBP11, whose transcription is activated by FOXM1, represses intron 4 retention in MCM7 pre-mRNA, thereby maintaining MCM7 expression. WBP11 silencing decreases MCM7 expression via increased intron 4 retention, and MCM7 knockdown attenuates the malignant behaviors promoted by WBP11 overexpression in ovarian cancer.","method":"RNA-seq with alternative splicing analysis; WBP11 siRNA knockdown; FOXM1 ChIP at WBP11 promoter; MCM7 overexpression rescue; in vitro and in vivo functional assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq splicing analysis, ChIP, and epistasis rescue, single lab with multiple methods","pmids":["38561505"],"is_preprint":false},{"year":2010,"finding":"In cholangiocarcinoma cells, C. sinensis excretory-secretory products increase global histone acetylation and recruit histone acetyltransferases (HATs) to the MCM7 promoter, leading to transcriptional activation of MCM7. ChIP assays confirmed HAT recruitment to the MCM7 promoter under ESP treatment.","method":"Promoter reporter assays; chromatin immunoprecipitation (HAT recruitment); histone acetylation assays; ChIP","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP with reporter assay demonstrating HAT-mediated MCM7 transcriptional activation, single lab","pmids":["20236609"],"is_preprint":false}],"current_model":"MCM7 is a core subunit of the MCM2-7 replicative DNA helicase whose conserved ATPase motifs are essential for helicase activity within the MCM4/6/7 sub-complex; it is loaded onto chromatin at origins in late M phase (through ORC/CDT1-dependent licensing), is required throughout both initiation and elongation of DNA replication, and is removed from chromatin at the end of S phase via RNF8-catalyzed K63-linked polyubiquitination at K145. Its activity and chromatin association are regulated by multiple post-translational modifications—phosphorylation by cyclin E/CDK2 and cyclin B/CDK1 at Ser-121 (controlling pre-RC assembly and mitotic exit), phosphorylation of MCM4 by CDKs or EBV-PK (inactivating helicase activity), SETD3-catalyzed histidine-459 methylation (promoting CDT1-mediated chromatin loading), and tyrosine phosphorylation at Y600 by Lyn downstream of EGFR (enhancing MCM complex assembly). MCM7 interacts with Rb (which inhibits DNA replication through this interaction, relieved by cyclin D1/CDK4), Rad17 (required for ATR recruitment and S-phase checkpoint signaling), cyclin A (required for S-phase entry), androgen receptor, RACK1/Akt complex, p27Kip1, MAT1/CAK, Plk1, and centrosomal Cep68/VHL; its transcription is directly activated by MYCN, E2F sites in its own promoter, YAP/TAZ, E2F8, and FOXM1-driven WBP11-mediated splicing, and is epigenetically regulated by histone lactylation and HDAC inhibitors."},"narrative":{"mechanistic_narrative":"MCM7 is a core subunit of the MCM2-7 replicative DNA helicase that drives both initiation and elongation of chromosomal DNA replication [PMID:15329670]. Within the catalytically active MCM4-MCM6-MCM7 sub-complex, MCM7's conserved ATPase motifs are essential for both ATPase and DNA helicase activity, and isolated MCM7 has no intrinsic activity—it functions only through assembly with partner subunits [PMID:10567526, PMID:12207017]. MCM7 is loaded onto chromatin at origins in a regulated manner: SETD3-catalyzed methylation of MCM7 at histidine-459 is required for CDT1-mediated chromatin loading and origin firing [PMID:39455502], and helicase loading and complex assembly are tuned by a cascade of phosphorylation events—cyclin E/CDK2 and cyclin B/CDK1 phosphorylate Ser-121 to control pre-RC assembly and mitotic exit [PMID:23720738], while inhibitory CDK/EBV-PK phosphorylation of MCM4 inactivates the helicase [PMID:17005684]. Beyond replication, MCM7 couples origin function to checkpoint signaling: it physically interacts with Rad17 and is required for ATR recruitment and Chk1 phosphorylation after replication stress [PMID:15538388]. Its activity is held in check by the retinoblastoma protein, which binds the MCM7 C-terminus and inhibits replication until cyclin D1/CDK4 catalyzes dissociation of the Rb·MCM7 complex from chromatin [PMID:9566894, PMID:12519773]. Removal from chromatin at replication termination is achieved by RNF8-catalyzed K63-linked polyubiquitination at K145, linking CMG helicase disassembly to the DNA damage response [PMID:39004272]. Numerous proliferative inputs—including cyclin A binding required for S-phase entry [PMID:23720738], the RACK1/Akt scaffold and EGFR→Lyn→Y600 phosphorylation that promote MCM complex assembly [PMID:23313748, PMID:23764002], and transcriptional activation by MYCN and E2F elements in its promoter [PMID:11861392, PMID:9714754]—converge on MCM7 to license proliferation, and biallelic pathogenic MCM7 variants that impair complex formation and S-phase progression cause autosomal recessive primary microcephaly and intellectual disability [PMID:34059554].","teleology":[{"year":1995,"claim":"Establishing that the MCM7 ortholog cycles between nucleus and cytoplasm in step with replication addressed how helicase availability is restricted to a single round of replication per cycle.","evidence":"Immunofluorescence and subcellular fractionation of yeast Cdc47 with cell cycle staging, plus complementation genetics","pmids":["7708676"],"confidence":"High","gaps":["Did not define the molecular trigger for nuclear import/export","Yeast ortholog; human regulation not directly tested here"]},{"year":1998,"claim":"Identifying direct Rb binding to the MCM7 C-terminus and its replication-inhibitory consequence revealed a mechanism coupling cell-cycle control machinery to the replicative helicase.","evidence":"Yeast two-hybrid, in vitro binding, Co-IP, and Xenopus in vitro replication assay","pmids":["9566894"],"confidence":"High","gaps":["Did not show how Rb·MCM7 is relieved in vivo","Effect on helicase enzymatic activity not directly measured"]},{"year":1999,"claim":"Reconstitution of the MCM4-6-7 sub-complex demonstrated that the MCM proteins possess intrinsic helicase activity and that distinct subunits supply ATPase versus ssDNA-binding functions.","evidence":"In vitro helicase assay with purified recombinant complexes and ATPase-motif mutagenesis of MCM4/MCM6","pmids":["10567526"],"confidence":"High","gaps":["MCM7's specific catalytic contribution not yet defined","Did not address the full MCM2-7 hexamer"]},{"year":2002,"claim":"Mutagenesis showed MCM7's conserved ATPase motifs are essential for the sub-complex's helicase activity and that MCM7 has no activity alone, establishing MCM7 as a catalytically integral but assembly-dependent subunit.","evidence":"In vitro ATPase/helicase assays, site-directed mutagenesis of MCM7 motifs, gel filtration","pmids":["12207017"],"confidence":"High","gaps":["Structural basis of inter-subunit cooperation not resolved","Role within intact MCM2-7 not tested"]},{"year":2004,"claim":"Functional neutralization in cell-free extracts established the MCM2-7 complex (via MCM7) as the replicative helicase active during elongation, not only initiation.","evidence":"Xenopus egg extract replication assay with Rb(1-400) and anti-Cdc45 inhibition plus aphidicolin uncoupling","pmids":["15329670"],"confidence":"High","gaps":["Did not define Cdc45's biochemical role in the active helicase","Mammalian cell-based confirmation not provided"]},{"year":2004,"claim":"Discovery of the MCM7–Rad17 interaction connected origin licensing machinery to ATR-dependent S-phase checkpoint signaling.","evidence":"Co-IP, siRNA depletion, ATR foci immunofluorescence, and phospho-Chk1 immunoblotting","pmids":["15538388"],"confidence":"High","gaps":["Did not resolve whether MCM7's checkpoint role is separable from its helicase role","Direct binding interface not mapped"]},{"year":2010,"claim":"Reciprocal genetic suppression with matched cyclin A and MCM7 mutants demonstrated that a direct cyclin A–MCM7 interaction on chromatin is required for S-phase entry.","evidence":"Cyclin A/MCM7 interaction mutants, chromatin-fraction Co-IP, RNAi rescue, S-phase assays","pmids":["21078875"],"confidence":"High","gaps":["Whether cyclin A delivers CDK activity to MCM7 not established","Phosphorylation target on MCM7 not identified here"]},{"year":2013,"claim":"Mapping CDK phosphorylation of MCM7 at Ser-121 defined a switch governing both pre-RC assembly and mitotic exit.","evidence":"In vitro CDK kinase assays, S121A mutagenesis, inducible overexpression, pre-RC Co-IP, cell cycle analysis","pmids":["23720738"],"confidence":"High","gaps":["In vivo stoichiometry and timing of S121 phosphorylation not quantified","Structural effect of phosphorylation on assembly unknown"]},{"year":2013,"claim":"The EGFR→Lyn→MCM7 Y600 cascade and the RACK1/Akt scaffold showed how growth-factor and oncogenic signaling directly enhance MCM complex assembly and licensing.","evidence":"In vitro kinase assays, phospho-specific antibodies, Co-IP, RACK1 binding mutants, chromatin fractionation, and transformation assays","pmids":["23764002","23313748"],"confidence":"High","gaps":["How phosphorylation mechanistically strengthens inter-subunit contacts unknown","Crosstalk between Y600 and Akt phosphosites not addressed"]},{"year":2021,"claim":"Identification of biallelic MCM7 variants in patients linked impaired MCM complex formation and S-phase progression to a Mendelian neurodevelopmental disorder.","evidence":"Exome/genome sequencing, complex-formation and S-phase assays, and wild-type vs mutant rescue in neuroblastoma cells","pmids":["34059554"],"confidence":"High","gaps":["Tissue-specific basis of microcephaly phenotype not explained","Variant effect on helicase catalysis not directly measured"]},{"year":2024,"claim":"Discovery of SETD3-mediated H459 methylation, RIOK2 phosphorylation, and RNF8 K63 ubiquitination at K145 defined the post-translational code controlling MCM7 chromatin loading and termination-coupled unloading.","evidence":"In vitro methylation/kinase/ubiquitination assays with site mutagenesis, NS-seq origin mapping, CDT1 chromatin-loading assays, and cell-cycle-staged fractionation","pmids":["39455502","38117512","39004272"],"confidence":"High","gaps":["Interplay/ordering among these modifications not integrated","How K145 ubiquitination triggers CMG disassembly mechanistically unresolved"]},{"year":null,"claim":"How the diverse PTMs, partner interactions, and transcriptional inputs on MCM7 are temporally coordinated into a single regulated licensing-to-unloading cycle remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated structural model of MCM7 within the loaded vs active CMG helicase from this corpus","Non-canonical roles (e.g., autophagy, centrosome splitting) lack mechanistic integration with replication function"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,13]},{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,17]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[6,10,14,28]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[25]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[24]}],"pathway":[{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[0,1,2]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[10,24]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[5]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[16,21,22]}],"complexes":["MCM2-7 helicase","MCM4-MCM6-MCM7 sub-complex","pre-replication complex"],"partners":["MCM4","MCM6","RB1","RAD17","CCNA (CYCLIN 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Mutation of conserved ATPase motifs in MCM6 abolished helicase activity, indicating MCM6 ATP binding is critical. MCM4 contributes to single-stranded DNA binding activity of the complex, and these two activities (helicase and ssDNA binding) can be separated.\",\n      \"method\": \"In vitro helicase assay with purified recombinant complexes from insect cells; ATPase motif mutagenesis of MCM4 and MCM6\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro helicase assay with mutagenesis of catalytic residues, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"10567526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Conserved ATPase motifs of MCM7 are essential for both ATPase and DNA helicase activities of the MCM4/6/7 complex. Uncomplexed MCM7 alone displays neither ATPase nor DNA helicase activity, indicating MCM7 contributes to helicase activity only through interaction with other subunits. A zinc finger mutant of MCM4 with impaired DNA binding showed elevated helicase activity and tended to dissociate into trimeric complexes, suggesting MCM4 zinc finger is involved in subunit interactions.\",\n      \"method\": \"In vitro ATPase and DNA helicase assays; site-directed mutagenesis of MCM7 ATPase motifs and MCM4 zinc finger; gel filtration analysis of complex assembly\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro enzymatic assays with mutagenesis of multiple subunits, multiple orthogonal approaches\",\n      \"pmids\": [\"12207017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MCM7 and CDC45 are required throughout DNA replication elongation in vertebrates, not just initiation. Neutralization of MCM7 using an Rb(1-400) fragment and Cdc45 antibodies both abolished chromosome unwinding by the uncoupled helicase (in aphidicolin-treated extracts), providing direct evidence that the MCM2-7 complex is the replicative DNA helicase and that Cdc45 is a helicase co-factor.\",\n      \"method\": \"Xenopus egg extract DNA replication assay; functional inhibition with Rb(1-400) fragment and anti-Cdc45 antibodies; aphidicolin-induced helicase uncoupling assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted cell-free replication system with two independent inhibitors giving concordant results, multiple functional readouts\",\n      \"pmids\": [\"15329670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The retinoblastoma protein (Rb) directly interacts with MCM7 via the Rb amino-terminus (residues 1-400) binding the C-terminal 137 amino acids of MCM7. Rb-related proteins p107 and p130 also bind MCM7. The Rb amino-terminus strongly inhibited DNA replication in an MCM7-dependent fashion in a Xenopus in vitro replication assay, establishing that Rb negatively regulates DNA replication through direct interaction with MCM7.\",\n      \"method\": \"Yeast two-hybrid screen; in vitro binding assay; anti-Rb co-immunoprecipitation from human cells; Xenopus in vitro DNA replication assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vitro binding, and functional replication assay with multiple orthogonal methods across two experimental systems\",\n      \"pmids\": [\"9566894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Yeast Cdc47 (MCM7 ortholog) undergoes cell cycle-regulated nuclear import and export: it enters the nucleus at mitosis, remains there until the initiation of DNA replication, then is rapidly exported to the cytoplasm at the start of S phase. Cdc47 protein levels do not vary with the cell cycle but expression and nascent synthesis peak in late M phase.\",\n      \"method\": \"Indirect immunofluorescence microscopy; subcellular fractionation; CDC47 gene isolation by complementation of temperature-sensitive mutant\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent localization methods (immunofluorescence + fractionation) with cell cycle staging, complementation genetic validation\",\n      \"pmids\": [\"7708676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Human MCM7 physically interacts with hRad17 and is required for replication checkpoint signaling. Depletion of either hRad17 or hMCM7 by siRNA suppressed UV- or aphidicolin-induced Chk1 phosphorylation and abolished UV-induced S-phase checkpoint activation. MCM7-depleted cells were defective for ATR nuclear foci formation after UV irradiation, indicating MCM7 is required for stable ATR recruitment to damaged DNA.\",\n      \"method\": \"Co-immunoprecipitation to identify hMCM7 as hRad17-interacting protein; siRNA knockdown; immunofluorescence for ATR foci; phospho-Chk1 immunoblotting\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus siRNA knockdown with multiple functional readouts (Chk1 phosphorylation, checkpoint activation, ATR foci) in a single study\",\n      \"pmids\": [\"15538388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Cyclin D1/CDK4 binds to MCM7 and MCM3 in the pre-replication complex on chromatin. Active cyclin D1/CDK4 catalyzes dissociation of the RB·MCM7 complex and promotes removal of RB from chromatin-bound complexes, although cyclin D1/CDK4 does not phosphorylate MCM7 directly. Cyclin E/CDK2 did not replicate this effect.\",\n      \"method\": \"Co-immunoprecipitation; chromatin fractionation; in vitro kinase assay; RB·MCM7 complex dissociation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, chromatin fractionation, and in vitro kinase assay with kinase-inactive controls and comparison to cyclin E/CDK2\",\n      \"pmids\": [\"12519773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Phosphorylation of MCM4 at Thr-19 and Thr-110 by CDK2/CDK1 inactivates the MCM4-MCM6-MCM7 helicase activity. EBV protein kinase (EBV-PK) phosphorylates these same sites plus additional sites on MCM4 and MCM6, also inactivating helicase activity. This mechanism accounts for blockade of chromosomal DNA replication during EBV lytic replication.\",\n      \"method\": \"In vitro helicase assay with purified MCM4-6-7 complex; phosphorylation site mapping; site-directed mutagenesis of MCM4 N-terminal Ser/Thr residues; EBV-PK expression in HeLa cells\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro helicase assay with mutagenesis and kinase assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"17005684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Polo-like kinase 1 (Plk1) interacts with MCM7 (and other MCM2-7 complex members) via its polo-box domain. Endogenous Plk1 co-immunoprecipitates with both basal and DNA damage-induced slower-migrating forms of Mcm7. The strongest interaction is in the soluble chromatin fraction, suggesting Plk1 coordinates DNA replication and mitotic events at chromatin.\",\n      \"method\": \"Polo-box domain pulldown screen; co-immunoprecipitation of endogenous proteins; subcellular fractionation (chromatin fraction)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — reciprocal Co-IP with fractionation, single lab, no functional rescue experiment\",\n      \"pmids\": [\"15654075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cyclin A promotes S-phase entry through direct interaction with MCM7. A cyclin A mutant (CycA-C1) that cannot bind MCM7 fails to promote S-phase entry. An Mcm7 mutant (Mcm7-3) that can bind CycA-C1 suppresses the S-phase entry defect of CycA-C1. Cyclin A and Mcm7 interact specifically in the chromatin fraction.\",\n      \"method\": \"Cyclin A mutant derivation; Mcm7 interaction screen; co-immunoprecipitation from chromatin fraction; RNAi knockdown and mutant rescue experiments; S-phase entry assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic suppression with matched cyclin A and MCM7 mutants, chromatin fractionation, RNAi rescue, multiple orthogonal methods\",\n      \"pmids\": [\"21078875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MCM7 is phosphorylated at Ser-121 by cyclin E/CDK2 and cyclin B/CDK1. The MCM7-S121A mutant fails to efficiently form a pre-RC complex with MCM3/MCM5/Cdc45. Overexpression of wild-type MCM7 (but not S121A) blocks S-phase entry through activation of the Chk1/p53 checkpoint. MCM7-S121A overexpression causes M-phase exit delay, indicating that Ser-121 phosphorylation in M phase is important for proper mitotic exit.\",\n      \"method\": \"In vitro kinase assay (cyclin E/CDK2, cyclin B/CDK1); site-directed mutagenesis (S121A); Tet-On inducible overexpression; co-immunoprecipitation for pre-RC complex; cell cycle analysis; Chk1 phosphorylation western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay combined with mutagenesis, inducible expression system, and multiple cell cycle readouts in a single study\",\n      \"pmids\": [\"23720738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Activated EGFR phosphorylates the p56 isoform of Lyn at Y32, which then phosphorylates MCM7 at Y600, increasing MCM7 association with other MCM complex proteins, thereby promoting DNA synthesis complex assembly and cell proliferation.\",\n      \"method\": \"Biochemical signaling cascade analysis; phospho-specific antibodies; co-immunoprecipitation; in vitro kinase assays; knockdown/overexpression in cancer cell lines\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assays establishing the EGFR→p56Lyn→MCM7 phosphorylation cascade, with Co-IP showing increased MCM complex assembly, multiple orthogonal methods\",\n      \"pmids\": [\"23764002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The CDK inhibitor p27Kip1 directly binds the conserved MCM domain of MCM7. This interaction occurs in a growth factor-dependent manner in vivo. The C-terminal domain of p27Kip1 inhibits DNA replication through this MCM7 interaction, independently of its function as a CDK inhibitor.\",\n      \"method\": \"Co-immunoprecipitation; in vitro binding assay; domain mapping; DNA replication assay with C-terminal p27Kip1 domain\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP and in vitro binding with domain mapping, single lab, limited functional rescue\",\n      \"pmids\": [\"16289477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MCM7 physically interacts with the androgen receptor (AR) both in vitro and in vivo. The AR-binding motif in MCM7 maps to amino acids 221-248, and the MCM7-binding motif in AR maps to amino acids 426-475. High doses of androgen (R1881) decreased MCM7 binding to genomic DNA, reduced DNA synthesis, and decreased S-phase entry; low doses increased MCM7 DNA licensing activity and proliferation. The MCM7/AR interaction down-regulated MCM7 expression, and AR transcriptional activity depended on its interaction with MCM7.\",\n      \"method\": \"Co-immunoprecipitation in vitro and in vivo; domain mapping by deletion mutants; DNA synthesis assay; FACS cell cycle analysis; MCM7 knockdown; AR mutant defective in MCM7 binding\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with domain mapping, functional assays using both gain and loss of function, multiple orthogonal readouts\",\n      \"pmids\": [\"18988800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human INT6 interacts with MCM7, and INT6 stabilizes chromatin-bound MCM7 protein. Proteasome inhibition strengthens the INT6–MCM7 interaction. In INT6-silenced cells, removal of MCM7 from chromatin during replication is accelerated, leading to reduced thymidine incorporation and reinforced RPA and claspin chromatin association, indicating replication deficiency.\",\n      \"method\": \"Yeast two-hybrid (INT6 as bait); co-immunoprecipitation; proteasome inhibitor treatment; chromatin fractionation; thymidine incorporation assay; siRNA depletion\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with chromatin fractionation and functional replication readout, single lab with multiple methods\",\n      \"pmids\": [\"17310990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"MAT1, the CDK-activating kinase assembly/targeting factor, physically interacts with MCM7. The C-terminal domain of MAT1 is required for this interaction (the RING finger is dispensable). MCM7 associates with the CAK complex in vivo in human osteosarcoma cells.\",\n      \"method\": \"Yeast two-hybrid screen; in vitro protein binding assay; co-immunoprecipitation from human MG63 cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — yeast two-hybrid confirmed by in vitro binding and Co-IP, single lab, no functional consequence demonstrated\",\n      \"pmids\": [\"11056214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In S. cerevisiae, Mcm7 acts as a novel cofactor of Mcm1 to modulate its own expression. Mcm7 stimulates Mcm1 binding to the early cell cycle box (ECB) upstream of the MCM7, CDC6, and MCM5 promoters. Mcm7 is recruited to these promoters during late M phase, consistent with a direct role in regulating periodic expression of early cell cycle genes.\",\n      \"method\": \"Genetic analysis (mcm7-1 and mcm1-1 mutants); chromatin immunoprecipitation; in vitro DNA binding (Mcm1 binding stimulation by Mcm7); promoter reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus in vitro binding and genetic mutants, single lab with multiple methods\",\n      \"pmids\": [\"12738768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In S. pombe, mcm7+ is essential for viability; loss of mcm7+ causes delayed S-phase entry and arrest with 2C DNA content. Mcm7p is a nuclear protein throughout the cell cycle, and its nuclear localization depends on the other MCM proteins. mcm7-98 is synthetically lethal with checkpoint mutants (Δcds1, Δchk1, Δrad3), suggesting chromosomal defects even at permissive temperature. Genetic evidence suggests the Mcm3p-Mcm5p dimer interacts with the Mcm4p-Mcm6p-Mcm7p core through Mcm7p.\",\n      \"method\": \"Genetic complementation; spore viability analysis; flow cytometry; immunofluorescence localization; synthetic lethality screens with checkpoint mutants\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic and cell biological approaches, single lab\",\n      \"pmids\": [\"11606526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RACK1 interacts with MCM7 (binding motif at amino acids 221-248 of MCM7) and acts as a scaffold bringing Akt into proximity with MCM7. RACK1 overexpression increases Akt-dependent MCM7 phosphorylation, promotes MCM7 chromatin binding and MCM complex formation, thereby stimulating DNA replication. PKC activation by PMA redistributes RACK1 from nucleus to cytoplasm, decreasing MCM7 chromatin association and inducing growth arrest. An MCM7 mutant unable to bind RACK1 lacks DNA replication licensing and oncogenic transformation activity.\",\n      \"method\": \"Co-immunoprecipitation in vivo and in vitro; domain mapping; RACK1 knockdown; PKC activation; chromatin fractionation; DNA synthesis assay; oncogenic transformation assay\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with domain mapping, loss-of-function (knockdown + binding mutant), multiple functional readouts in a single study\",\n      \"pmids\": [\"23313748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RACK1 mediates MCM7 phosphorylation by Akt in a ternary MCM7/RACK1/Akt signaling complex, increasing MCM7 chromatin binding and MCM complex formation to promote DNA replication and cell proliferation in non-small-cell lung cancer.\",\n      \"method\": \"Co-immunoprecipitation; overexpression; in vitro phosphorylation assay; chromatin fractionation; cell proliferation assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP with phosphorylation data and chromatin fractionation, single lab, independently corroborates PMID 23313748\",\n      \"pmids\": [\"28465488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ATO suppresses MCM7 transcription by targeting the SRF/MCM7 complex, which functions as a transcriptional regulator of MCM7 expression in HCC. MCM7 knockdown recapitulates ATO effects on cancer stem cell traits and metastasis, while MCM7 overexpression abolishes these effects.\",\n      \"method\": \"Co-immunoprecipitation/complex identification; MCM7 promoter assays; MCM7 knockdown and overexpression; in vivo xenograft and metastasis models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying SRF/MCM7 transcriptional complex, gain and loss of function with in vivo validation, single lab\",\n      \"pmids\": [\"31186405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MYCN directly transcriptionally activates MCM7 in neuroblastoma. Induction of MYCN increases endogenous MCM7 mRNA and protein levels (~3-fold). MCM7 promoter/luciferase reporter activity is significantly increased under MYCN-induced conditions, and specific EMSA shifts of MCM7 promoter sequences are detected in MYCN-amplified cell extracts.\",\n      \"method\": \"Microarray analysis; conditional MYCN induction; luciferase reporter assay; electrophoretic mobility shift assay (EMSA); western blot\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus luciferase reporter with conditional induction, single lab\",\n      \"pmids\": [\"11861392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The human MCM7 promoter contains functional E2F binding sites and an E-box that are essential for promoter activity. Multiple transcription start sites are used upon growth stimulation. The minimal promoter requires an E-box and one E2F site for transcription.\",\n      \"method\": \"Promoter cloning; luciferase reporter assays; deletion analysis; identification of transcription start sites\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — promoter deletion analysis with reporter assays, single lab, no protein-DNA binding experiments shown\",\n      \"pmids\": [\"9714754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Biallelic pathogenic variants in MCM7 cause autosomal recessive primary microcephaly and intellectual disability. Variants in MCM7 interfere with MCM complex formation and impair S-phase progression efficiency. The p.A265T missense variant is deleterious; overexpression of wild-type but not mutant MCM7 counterbalances the reduced cell viability/proliferation caused by Mcm7 knockdown in neuroblastoma cells.\",\n      \"method\": \"Exome/genome sequencing; functional studies: MCM complex formation assay; S-phase progression analysis; Mcm7 knockdown in mouse neuroblastoma cells; wild-type vs. mutant MCM7 rescue experiment\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MCM complex formation assay + S-phase analysis + mutant rescue experiment, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"34059554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MCM7 depletion promotes mitotic exit by inhibiting CDK1 activity. MCM7 maintains chromatin association during M phase. MCM7 siRNA depletion leads to CDK1 inactivation, promotes cohesin/RAD21 cleavage, and accelerates sister chromatid segregation. MCM7 co-localizes with tubulin in mitotic cells and its depletion results in aberrant spindle formation.\",\n      \"method\": \"siRNA knockdown; CDK1 activity assay; cohesin/RAD21 cleavage immunoblot; immunofluorescence co-localization with tubulin; cell cycle analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — siRNA with CDK1 activity readout and immunofluorescence, single lab, limited mechanistic depth\",\n      \"pmids\": [\"28588300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MCM7 overexpression strengthens the Cep68-VHL interaction at centrosomes, leading to Cep68 ubiquitination and proteasomal degradation, thereby causing centrosome splitting. MCM7 directly binds Cep68 in vitro and complexes with Cep68 and VHL in vivo. Absence of MCM7 weakens the Cep68-VHL interaction.\",\n      \"method\": \"In vitro binding assay (MCM7 with Cep68); co-immunoprecipitation (MCM7/Cep68/VHL); overexpression and knockdown; ubiquitination assay; immunofluorescence for centrosome splitting\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vitro binding confirmed by Co-IP with functional ubiquitination/centrosome readout, single lab\",\n      \"pmids\": [\"28578000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SETD3 histidine methyltransferase methylates MCM7 at histidine-459 (H459me), and this modification is required for CDT1-mediated chromatin loading of the MCM complex and for replication origin firing. SETD3 depletion attenuates early replication origin firing. CDK2 phosphorylates SETD3 at Ser-21 during G1/S, which is required for this pathway. Impairment of H459 methylation on MCM7 attenuates DNA synthesis and MCM chromatin loading.\",\n      \"method\": \"Nascent-strand sequencing (NS-seq) for replication origin analysis; biochemical pulldown (SETD3 binds MCM); in vitro methylation assay (SETD3 on MCM7 H459); site-directed mutagenesis (H459A); CDT1-mediated chromatin loading assay; CDK2 phosphorylation of SETD3\",\n      \"journal\": \"Science China. Life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro methylation assay with mutagenesis, NS-seq for replication origins, chromatin loading assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"39455502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PLCE1 promotes MCM7 expression via PKCα-mediated phosphorylation of E2F1, which transcriptionally activates MCM7. Additionally, PLCE1 potentiates phosphorylation of MCM7 at six threonine residues by the atypical kinase RIOK2, promoting MCM complex assembly and chromatin loading. Inhibition of PLCE1 or RIOK2 impairs MCM7-mediated DNA replication, causing G1-S arrest.\",\n      \"method\": \"Phosphorylation site mapping (six Thr residues); kinase assay (RIOK2 on MCM7); MCM complex assembly co-immunoprecipitation; chromatin loading assay; E2F1 phosphorylation analysis; cell cycle assays; in vivo tumor models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with site mapping, Co-IP for complex assembly, chromatin loading assay, and in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"38117512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The E3 ubiquitin ligase RNF8 catalyzes K63-linked multi-ubiquitination of MCM7 at K145, both in vitro and in vivo. This modification is dynamically regulated during the cell cycle, peaking on chromatin during late S phase. RNF168 and BRCA1 promote MCM7 polyubiquitylation during replication termination. Upon DNA damage, RNF8-mediated MCM7 polyubiquitination decreases significantly during late S phase, linking CMG helicase disassembly to DNA damage response.\",\n      \"method\": \"In vitro ubiquitination assay (RNF8 on MCM7); in vivo ubiquitination assay; K145 site mapping; cell cycle-staged chromatin fractionation; RNF168/BRCA1 co-transfection assays; DNA damage treatment\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro and in vivo ubiquitination assays with site mapping by mutagenesis, cell cycle analysis, multiple orthogonal approaches\",\n      \"pmids\": [\"39004272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRMT5 physically interacts with MCM7; the direct binding domain in MCM7 maps to residues 1-248. Co-immunoprecipitation confirmed the physical interaction. MCM7 promotes CRC cell proliferation, migration, and invasion in vitro.\",\n      \"method\": \"Co-immunoprecipitation; domain mapping (MCM7 deletion constructs); siRNA/overexpression functional assays in CRC cells\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single Co-IP with domain mapping; functional data from knockdown/overexpression but no mechanistic link between PRMT5 binding and MCM7 function demonstrated\",\n      \"pmids\": [\"33675123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MCM7 facilitates autolysosome formation by binding dynein, thereby promoting autophagic flux in bladder cancer stem-like cells. MCM7 knockdown inhibits autophagic flux, reduces stemness, and triggers AMPK activation leading to increased BCL2/BECLIN1 interaction and P53 accumulation.\",\n      \"method\": \"MCM7 knockdown; co-immunoprecipitation (MCM7 with dynein); autophagy/mitophagy flux assays; AMPK pathway analysis; mitochondrial respiration measurement\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP with dynein plus functional autophagic flux assay, single lab, non-canonical MCM7 function\",\n      \"pmids\": [\"36111256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Histone lactylation at the MCM7 locus facilitates MCM7 transcriptional activation in hepatocellular carcinoma. Treatment with glycolysis inhibitor 2-DG decreases MCM7 mRNA and protein, while rotenone (glycolysis activator) increases them. Rescue experiments confirmed histone lactylation is necessary for MCM7-driven CSC properties and radio-resistance.\",\n      \"method\": \"2-DG and rotenone treatment; MCM7 knockdown/overexpression; spheroid formation assays; colony formation; xenograft model; rescue experiments with histone lactylation modulation\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — pharmacological modulation of lactylation with MCM7 rescue, single lab, no direct chromatin lactylation mapping at MCM7 locus reported in abstract\",\n      \"pmids\": [\"40118288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"E2F8 transcription factor binds the MCM7 promoter and activates MCM7 transcription. E2F8 knockdown suppresses bladder cancer cell proliferation and causes G1 arrest; MCM7 overexpression rescues these effects, placing E2F8 upstream of MCM7 in bladder cancer cell cycle regulation.\",\n      \"method\": \"Chromatin immunoprecipitation (E2F8 binding to MCM7 promoter); luciferase reporter assay; E2F8 knockdown; MCM7 overexpression rescue; in vivo xenograft model\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP plus reporter assay with epistasis rescue experiment, single lab\",\n      \"pmids\": [\"39601318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Splicing factor WBP11, whose transcription is activated by FOXM1, represses intron 4 retention in MCM7 pre-mRNA, thereby maintaining MCM7 expression. WBP11 silencing decreases MCM7 expression via increased intron 4 retention, and MCM7 knockdown attenuates the malignant behaviors promoted by WBP11 overexpression in ovarian cancer.\",\n      \"method\": \"RNA-seq with alternative splicing analysis; WBP11 siRNA knockdown; FOXM1 ChIP at WBP11 promoter; MCM7 overexpression rescue; in vitro and in vivo functional assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq splicing analysis, ChIP, and epistasis rescue, single lab with multiple methods\",\n      \"pmids\": [\"38561505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In cholangiocarcinoma cells, C. sinensis excretory-secretory products increase global histone acetylation and recruit histone acetyltransferases (HATs) to the MCM7 promoter, leading to transcriptional activation of MCM7. ChIP assays confirmed HAT recruitment to the MCM7 promoter under ESP treatment.\",\n      \"method\": \"Promoter reporter assays; chromatin immunoprecipitation (HAT recruitment); histone acetylation assays; ChIP\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP with reporter assay demonstrating HAT-mediated MCM7 transcriptional activation, single lab\",\n      \"pmids\": [\"20236609\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MCM7 is a core subunit of the MCM2-7 replicative DNA helicase whose conserved ATPase motifs are essential for helicase activity within the MCM4/6/7 sub-complex; it is loaded onto chromatin at origins in late M phase (through ORC/CDT1-dependent licensing), is required throughout both initiation and elongation of DNA replication, and is removed from chromatin at the end of S phase via RNF8-catalyzed K63-linked polyubiquitination at K145. Its activity and chromatin association are regulated by multiple post-translational modifications—phosphorylation by cyclin E/CDK2 and cyclin B/CDK1 at Ser-121 (controlling pre-RC assembly and mitotic exit), phosphorylation of MCM4 by CDKs or EBV-PK (inactivating helicase activity), SETD3-catalyzed histidine-459 methylation (promoting CDT1-mediated chromatin loading), and tyrosine phosphorylation at Y600 by Lyn downstream of EGFR (enhancing MCM complex assembly). MCM7 interacts with Rb (which inhibits DNA replication through this interaction, relieved by cyclin D1/CDK4), Rad17 (required for ATR recruitment and S-phase checkpoint signaling), cyclin A (required for S-phase entry), androgen receptor, RACK1/Akt complex, p27Kip1, MAT1/CAK, Plk1, and centrosomal Cep68/VHL; its transcription is directly activated by MYCN, E2F sites in its own promoter, YAP/TAZ, E2F8, and FOXM1-driven WBP11-mediated splicing, and is epigenetically regulated by histone lactylation and HDAC inhibitors.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MCM7 is a core subunit of the MCM2-7 replicative DNA helicase that drives both initiation and elongation of chromosomal DNA replication [#2]. Within the catalytically active MCM4-MCM6-MCM7 sub-complex, MCM7's conserved ATPase motifs are essential for both ATPase and DNA helicase activity, and isolated MCM7 has no intrinsic activity—it functions only through assembly with partner subunits [#0, #1]. MCM7 is loaded onto chromatin at origins in a regulated manner: SETD3-catalyzed methylation of MCM7 at histidine-459 is required for CDT1-mediated chromatin loading and origin firing [#26], and helicase loading and complex assembly are tuned by a cascade of phosphorylation events—cyclin E/CDK2 and cyclin B/CDK1 phosphorylate Ser-121 to control pre-RC assembly and mitotic exit [#10], while inhibitory CDK/EBV-PK phosphorylation of MCM4 inactivates the helicase [#7]. Beyond replication, MCM7 couples origin function to checkpoint signaling: it physically interacts with Rad17 and is required for ATR recruitment and Chk1 phosphorylation after replication stress [#5]. Its activity is held in check by the retinoblastoma protein, which binds the MCM7 C-terminus and inhibits replication until cyclin D1/CDK4 catalyzes dissociation of the Rb·MCM7 complex from chromatin [#3, #6]. Removal from chromatin at replication termination is achieved by RNF8-catalyzed K63-linked polyubiquitination at K145, linking CMG helicase disassembly to the DNA damage response [#28]. Numerous proliferative inputs—including cyclin A binding required for S-phase entry [#10], the RACK1/Akt scaffold and EGFR→Lyn→Y600 phosphorylation that promote MCM complex assembly [#18, #11], and transcriptional activation by MYCN and E2F elements in its promoter [#21, #22]—converge on MCM7 to license proliferation, and biallelic pathogenic MCM7 variants that impair complex formation and S-phase progression cause autosomal recessive primary microcephaly and intellectual disability [#23].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing that the MCM7 ortholog cycles between nucleus and cytoplasm in step with replication addressed how helicase availability is restricted to a single round of replication per cycle.\",\n      \"evidence\": \"Immunofluorescence and subcellular fractionation of yeast Cdc47 with cell cycle staging, plus complementation genetics\",\n      \"pmids\": [\"7708676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular trigger for nuclear import/export\", \"Yeast ortholog; human regulation not directly tested here\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identifying direct Rb binding to the MCM7 C-terminus and its replication-inhibitory consequence revealed a mechanism coupling cell-cycle control machinery to the replicative helicase.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding, Co-IP, and Xenopus in vitro replication assay\",\n      \"pmids\": [\"9566894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not show how Rb·MCM7 is relieved in vivo\", \"Effect on helicase enzymatic activity not directly measured\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Reconstitution of the MCM4-6-7 sub-complex demonstrated that the MCM proteins possess intrinsic helicase activity and that distinct subunits supply ATPase versus ssDNA-binding functions.\",\n      \"evidence\": \"In vitro helicase assay with purified recombinant complexes and ATPase-motif mutagenesis of MCM4/MCM6\",\n      \"pmids\": [\"10567526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MCM7's specific catalytic contribution not yet defined\", \"Did not address the full MCM2-7 hexamer\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mutagenesis showed MCM7's conserved ATPase motifs are essential for the sub-complex's helicase activity and that MCM7 has no activity alone, establishing MCM7 as a catalytically integral but assembly-dependent subunit.\",\n      \"evidence\": \"In vitro ATPase/helicase assays, site-directed mutagenesis of MCM7 motifs, gel filtration\",\n      \"pmids\": [\"12207017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of inter-subunit cooperation not resolved\", \"Role within intact MCM2-7 not tested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Functional neutralization in cell-free extracts established the MCM2-7 complex (via MCM7) as the replicative helicase active during elongation, not only initiation.\",\n      \"evidence\": \"Xenopus egg extract replication assay with Rb(1-400) and anti-Cdc45 inhibition plus aphidicolin uncoupling\",\n      \"pmids\": [\"15329670\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define Cdc45's biochemical role in the active helicase\", \"Mammalian cell-based confirmation not provided\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Discovery of the MCM7–Rad17 interaction connected origin licensing machinery to ATR-dependent S-phase checkpoint signaling.\",\n      \"evidence\": \"Co-IP, siRNA depletion, ATR foci immunofluorescence, and phospho-Chk1 immunoblotting\",\n      \"pmids\": [\"15538388\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether MCM7's checkpoint role is separable from its helicase role\", \"Direct binding interface not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Reciprocal genetic suppression with matched cyclin A and MCM7 mutants demonstrated that a direct cyclin A–MCM7 interaction on chromatin is required for S-phase entry.\",\n      \"evidence\": \"Cyclin A/MCM7 interaction mutants, chromatin-fraction Co-IP, RNAi rescue, S-phase assays\",\n      \"pmids\": [\"21078875\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cyclin A delivers CDK activity to MCM7 not established\", \"Phosphorylation target on MCM7 not identified here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapping CDK phosphorylation of MCM7 at Ser-121 defined a switch governing both pre-RC assembly and mitotic exit.\",\n      \"evidence\": \"In vitro CDK kinase assays, S121A mutagenesis, inducible overexpression, pre-RC Co-IP, cell cycle analysis\",\n      \"pmids\": [\"23720738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo stoichiometry and timing of S121 phosphorylation not quantified\", \"Structural effect of phosphorylation on assembly unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The EGFR→Lyn→MCM7 Y600 cascade and the RACK1/Akt scaffold showed how growth-factor and oncogenic signaling directly enhance MCM complex assembly and licensing.\",\n      \"evidence\": \"In vitro kinase assays, phospho-specific antibodies, Co-IP, RACK1 binding mutants, chromatin fractionation, and transformation assays\",\n      \"pmids\": [\"23764002\", \"23313748\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phosphorylation mechanistically strengthens inter-subunit contacts unknown\", \"Crosstalk between Y600 and Akt phosphosites not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of biallelic MCM7 variants in patients linked impaired MCM complex formation and S-phase progression to a Mendelian neurodevelopmental disorder.\",\n      \"evidence\": \"Exome/genome sequencing, complex-formation and S-phase assays, and wild-type vs mutant rescue in neuroblastoma cells\",\n      \"pmids\": [\"34059554\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific basis of microcephaly phenotype not explained\", \"Variant effect on helicase catalysis not directly measured\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Discovery of SETD3-mediated H459 methylation, RIOK2 phosphorylation, and RNF8 K63 ubiquitination at K145 defined the post-translational code controlling MCM7 chromatin loading and termination-coupled unloading.\",\n      \"evidence\": \"In vitro methylation/kinase/ubiquitination assays with site mutagenesis, NS-seq origin mapping, CDT1 chromatin-loading assays, and cell-cycle-staged fractionation\",\n      \"pmids\": [\"39455502\", \"38117512\", \"39004272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay/ordering among these modifications not integrated\", \"How K145 ubiquitination triggers CMG disassembly mechanistically unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse PTMs, partner interactions, and transcriptional inputs on MCM7 are temporally coordinated into a single regulated licensing-to-unloading cycle remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated structural model of MCM7 within the loaded vs active CMG helicase from this corpus\", \"Non-canonical roles (e.g., autophagy, centrosome splitting) lack mechanistic integration with replication function\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 13]},\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 17]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [6, 10, 14, 28]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [25]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [10, 24]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [16, 21, 22]}\n    ],\n    \"complexes\": [\n      \"MCM2-7 helicase\",\n      \"MCM4-MCM6-MCM7 sub-complex\",\n      \"pre-replication complex\"\n    ],\n    \"partners\": [\n      \"MCM4\",\n      \"MCM6\",\n      \"RB1\",\n      \"RAD17\",\n      \"CCNA (cyclin A)\",\n      \"RACK1\",\n      \"CDT1\",\n      \"RNF8\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}