{"gene":"MCRS1","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1998,"finding":"MSP58 (MCRS1) physically interacts with nucleolar protein p120; the interaction requires the coiled-coil domain in the N-terminal region of p120 and the C-terminal region of MSP58, as shown by yeast two-hybrid, recombinant co-expression in Sf9 cells, and deletion mutagenesis. MSP58 localizes to microspherules in the nucleolus, and overexpression causes irregular nucleolar enlargement in COS-7 cells.","method":"Yeast two-hybrid, recombinant protein co-expression in insect Sf9 cells, deletion mutagenesis, immunofluorescence","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — yeast two-hybrid confirmed by in vitro reconstitution in Sf9 cells, domain mapping by deletion mutagenesis, and localization imaging; multiple orthogonal methods in one study","pmids":["9654073"],"is_preprint":false},{"year":2004,"finding":"MCRS2 (splice variant of MCRS1/p78) interacts with the telomerase-inhibitory protein LPTS/PinX1 in vitro and in vivo, co-localizes with LPTS/PinX1 in cells, inhibits telomerase activity in vitro, and its long-term overexpression progressively shortens telomeres in SMMC-7721 cells. MCRS2 expression is cell-cycle dependent, accumulating in early S phase.","method":"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation, immunofluorescence co-localization, telomerase activity assay, telomere length measurement","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal in vitro and in vivo binding confirmed, functional telomerase inhibition assay, and long-term telomere shortening phenotype; multiple orthogonal methods","pmids":["15044100"],"is_preprint":false},{"year":2005,"finding":"The PTEN C-terminal domain physically interacts with the forkhead-associated (FHA) domain of MSP58 (MCRS1), requiring PTEN Thr-366. This interaction suppresses MSP58-driven cellular transformation, as PTEN(T366A) mutant fails to suppress MSP58-induced foci formation, while catalytically inactive PTEN (G129R) retains suppressive activity, demonstrating the C-terminal interaction (not phosphatase activity) is responsible.","method":"Co-immunoprecipitation, focus-formation assay in Pten-/- MEFs, point-mutant analysis (T366A, G129R)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — physical interaction mapped by co-IP, functional consequence validated by point mutations in both proteins, cell-based transformation assay with rigorous controls","pmids":["15659546"],"is_preprint":false},{"year":2005,"finding":"MSP58 (MCRS1) interacts with the bHLH transcription factor STRA13 through the basic domain of STRA13 and the FHA domain of MSP58; this interaction is modulated by STRA13 phosphorylation status. Complex formation protects both proteins from proteasome-mediated degradation, extending their half-lives. MSP58 and STRA13 synergistically repress STRA13 promoter-driven transcription and both proteins accumulate during S phase.","method":"Yeast two-hybrid, co-immunoprecipitation, phospho-peptide mapping, proteasome inhibitor experiments, luciferase reporter assay, cell-cycle expression analysis","journal":"Cellular and molecular life sciences : CMLS","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, domain mapping, functional reporter assay, and protein stability experiments in a single study with multiple orthogonal methods","pmids":["15719173"],"is_preprint":false},{"year":2006,"finding":"p78/MCRS1 associates with centrosomal proteins Nde1 and Su48; the FHA domain of p78 is required for these interactions and for centrosomal localization. A fraction of p78 localizes to the centrosome (in addition to the nucleus). The Nde1-p78 interaction is regulated by phosphorylation of Nde1. siRNA knockdown of p78 causes cell death and a modest mitotic delay.","method":"Yeast two-hybrid, co-immunoprecipitation, immunofluorescence (centrosome localization), domain mapping, siRNA knockdown with viability and cell-cycle assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid confirmed by co-IP, domain mapping, direct localization imaging, phosphorylation-dependent regulation, and functional knockdown phenotype; multiple orthogonal methods","pmids":["16547491"],"is_preprint":false},{"year":2006,"finding":"DIPA (delta-interacting protein A) physically associates with p78/MCRS1/MSP58 as shown by co-immunoprecipitation; the structural regions mediating the interaction were identified. DIPA co-localizes predominantly with p78 in the nucleus, and DIPA acts as a repressor of gene transcription, an activity enhanced by p78.","method":"Co-immunoprecipitation, domain mapping, immunofluorescence co-localization, transcriptional reporter assay","journal":"Experimental and molecular pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with domain mapping and functional transcription reporter, single lab","pmids":["17014843"],"is_preprint":false},{"year":2006,"finding":"NDRG2 interacts with MSP58 (MCRS1); the FHA domain of MSP58 is essential for this interaction. NDRG2 co-localizes with MSP58 in the nucleus of HeLa cells during cell stress. Modulation of NDRG2 levels influences cell cycle progression together with MSP58.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence co-localization, cell cycle analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — interaction confirmed by three methods (Y2H, GST pull-down, co-IP) with domain mapping; functional link to cell cycle is phenotypic without full mechanistic placement","pmids":["17109818"],"is_preprint":false},{"year":2009,"finding":"MCRS2 (isoform of MCRS1) directly interacts with the CNC-bZIP transcription factor Nrf1; the interaction domains were mapped to residues 354–447 of Nrf1 and residues 314–475 of MCRS2. MCRS2 co-localizes with Nrf1 in the nucleus and represses Nrf1-mediated transcriptional activation in reporter assays.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence, luciferase reporter assay","journal":"BMC cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — interaction confirmed by three orthogonal binding methods with domain mapping, and transcriptional repression validated functionally","pmids":["19187526"],"is_preprint":false},{"year":2010,"finding":"Drosophila MCRS2 (ortholog of human MCRS1/MCRS2) co-purifies with RNA polymerase II complexes, localizes to the 5' ends of genes, and is required for optimal recruitment of RNAP II to promoter regions of cyclin genes and for normal cyclin gene expression levels.","method":"Co-purification/co-IP with RNAP II, chromatin immunoprecipitation (ChIP), RNA expression analysis, genetic knockdown","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct co-purification with RNAP II, ChIP showing promoter occupancy, and functional gene expression phenotype; multiple orthogonal methods in a peer-reviewed study","pmids":["20679484"],"is_preprint":false},{"year":2012,"finding":"MSP58 (MCRS1) forms a ternary complex with p53 and BRG1 (SWI/SNF subunit) on the p21 promoter to activate p21 transcription. MSP58 also activates the DNA damage response and p53/p21 signaling pathways. MSP58-induced senescence strictly requires functional p53; cells with p53 knockdown or mutant p53 bypass MSP58-induced senescence.","method":"Chromatin immunoprecipitation (ChIP), co-immunoprecipitation (ternary complex), shRNA knockdown of p53, ectopic overexpression, senescence assays (β-galactosidase), western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrates promoter occupancy of ternary complex, co-IP confirms interaction, p53 dependency established by two genetic approaches; multiple orthogonal methods","pmids":["22563078"],"is_preprint":false},{"year":2012,"finding":"EDD (UBR5), a HECT-domain ubiquitin E3 ligase, directly interacts with MSP58 (MCRS1) in vitro and in vivo. EDD depletion increases MSP58 protein levels and extends its half-life. MSP58 is ubiquitinated and degraded via the ubiquitin-proteasome pathway. Knockdown of either MSP58 or EDD alters cyclin B, D, and E levels and cell cycle progression.","method":"Co-immunoprecipitation, in vitro binding assay, proteasome inhibitor (MG132) treatment, ubiquitination assay, siRNA knockdown with western blot and cell cycle analysis","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct in vitro binding confirmed, E3 ligase-substrate relationship established by half-life and ubiquitination experiments with multiple methods","pmids":["23069210"],"is_preprint":false},{"year":2015,"finding":"MCRS1 is an essential link between Rheb and mTORC1 activation by amino acids (AAs). In an AA-dependent manner, MCRS1 maintains Rheb at lysosome surfaces. MCRS1 depletion (siRNA or Cre/Lox in MEFs) reduces mTORC1 activity, promotes Rheb–TSC2 interaction (rendering Rheb inactive), and delocalizes Rheb from lysosomes to recycling endocytic vesicles.","method":"siRNA knockdown, inducible Cre/Lox knockout in MEFs, co-immunoprecipitation, immunofluorescence (lysosomal localization of Rheb), mTORC1 activity assays, amino acid stimulation/deprivation","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent loss-of-function systems (siRNA and Cre/Lox KO), multiple co-IP interactions measured, subcellular localization changes quantified, pathway position validated by AA-dependence experiments","pmids":["25816988"],"is_preprint":false},{"year":2015,"finding":"BAP1, a nuclear de-ubiquitinating enzyme, binds MCRS1 and stabilizes it by removing ubiquitin chains (de-ubiquitination), thereby preventing proteasomal degradation of MCRS1. BAP1 contributes to chromosome stability partially through MCRS1. MCRS1 is a component of centrosomal proteins and plays an essential role in spindle assembly.","method":"Co-immunoprecipitation, de-ubiquitination assay, BAP1 knockdown/knockout with MCRS1 stability measurement, chromosome instability assays","journal":"Cancer letters","confidence":"High","confidence_rationale":"Tier 2 / Moderate — writer/eraser identified (BAP1 as DUB for MCRS1), substrate relationship supported by co-IP and functional stability assays; single lab but multiple methods","pmids":["26300492"],"is_preprint":false},{"year":2015,"finding":"MSP58 (MCRS1) contains two nuclear localization signals (NLS1: residues 32–56; NLS2: residues 113–123) and a bipartite nucleolar localization signal within NLS1 (residues 44–56). MSP58 binds importin α1 and α6, indicating receptor-mediated nuclear import. Both nuclear and nucleolar localization are required for MSP58-mediated transcriptional regulation of p21 and ribosomal RNA genes.","method":"Deletion/mutation analysis of NLS/NoLS, yeast two-hybrid, GST pull-down, co-immunoprecipitation with importins, reporter assays, immunofluorescence","journal":"Journal of biomedical science","confidence":"High","confidence_rationale":"Tier 2 / Strong — NLS mapped by mutagenesis, importin binding confirmed by three methods, functional transcriptional consequences linked to specific localization signals","pmids":["25981436"],"is_preprint":false},{"year":2016,"finding":"MCRS1 localizes to centriolar satellites and is required for dynein-dependent cargo transport to the centrosome. MCRS1 knockdown disperses centriolar satellites. MCRS1 plays a positive role in ciliogenesis initiation, possibly through interaction with TTBK2. Zebrafish mcrs1 mutants show brain/eye size reduction due to apoptosis, defective retinal layering, melanosome aggregation defects, and reduced ciliogenesis — phenotypes resembling dynein mutants. Additionally, MCRS1 directly associates with cytoplasmic dynein.","method":"siRNA knockdown, immunofluorescence (centriolar satellite localization), zebrafish mcrs1 mutant phenotype analysis, co-immunoprecipitation with dynein components, ciliogenesis assays","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — localization tied to functional consequence (satellite dispersion), in vivo mutant phenotype in zebrafish, direct dynein binding by co-IP; multiple orthogonal methods","pmids":["27263857"],"is_preprint":false},{"year":2016,"finding":"Aurora-A kinase phosphorylates MCRS1 on Ser35/36 during mitosis. This phosphorylation does not affect MCRS1 localization to chromosomal MTs or K-fiber minus-ends, but regulates MCRS1 activity in mitosis, particularly in tuning kinetochore fiber (K-fiber) minus-end dynamics.","method":"In vitro kinase assay, phospho-site mutagenesis, immunofluorescence, siRNA-based functional assays in mitosis","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro phosphorylation demonstrated and mutant phenotype characterized, but abstract lacks full mechanistic follow-up detail; single lab","pmids":["27192185"],"is_preprint":false},{"year":2016,"finding":"MCRS1 (MSP58) directly interacts with RINT-1 in vitro and in vivo; both proteins co-localize with UBF in the nucleolus. Overexpression of either MSP58 or RINT-1 decreases rRNA expression and rDNA promoter activity, while co-expression produces a greater decrease. Both MSP58 and RINT-1 associate with the rDNA promoter as shown by ChIP.","method":"Yeast two-hybrid, in vitro binding, co-immunoprecipitation, immunofluorescence co-localization, rRNA expression assays, rDNA promoter reporter assay, chromatin immunoprecipitation (ChIP)","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — interaction confirmed by multiple binding assays, ChIP demonstrates direct promoter occupancy, functional rRNA/reporter assays; multiple orthogonal methods","pmids":["27530925"],"is_preprint":false},{"year":2019,"finding":"Mps1 kinase binds and phosphorylates MCRS1, enabling KIF2A localization to the minus end of spindle microtubules, thereby regulating chromosome alignment. MCRS1 controls the dynamics of the minus end of kinetochore microtubules.","method":"Co-immunoprecipitation (Mps1–MCRS1 binding), in vitro kinase assay (phosphorylation), immunofluorescence (KIF2A localization), siRNA/inhibitor-based functional assays (chromosome alignment)","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — kinase-substrate relationship established in vitro and in vivo, downstream localization consequence shown by imaging; single lab but multiple orthogonal methods","pmids":["30785839"],"is_preprint":false},{"year":2019,"finding":"MCRS1 physically interacts with Pkmyt1 (a WEE1-family kinase) in vitro and the two proteins co-localize in the cytoplasm. Overexpression of MCRS1 inhibits growth, invasion and migration of gastric cancer cells and suppresses Pkmyt1 expression, while downregulation of MCRS1 promotes these phenotypes; inhibition of WEE1/Pkmyt1 with MK1775 rescues the MCRS1-knockdown phenotype.","method":"Co-immunoprecipitation, immunofluorescence co-localization, overexpression/knockdown cell assays, kinase inhibitor (MK1775) epistasis","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — physical interaction confirmed by co-IP with co-localization, epistasis with kinase inhibitor; single lab with moderate mechanistic depth","pmids":["30953699"],"is_preprint":false},{"year":2020,"finding":"MCRS1 is essential for epiblast development in early murine embryogenesis. Mcrs1 mutant embryos show normal blastocyst morphology but fail to form an inner cell mass colony in outgrowth assays; trophoblast and primitive endoderm are properly specified, but the epiblast lineage is specifically compromised with severely reduced cell number. Global H4 acetylation and apoptosis are normal in mutant blastocysts.","method":"Conditional Mcrs1 knockout mouse, outgrowth assays, lineage marker immunostaining, histone H4 acetylation analysis, apoptosis assay","journal":"Reproduction (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function in vivo with specific lineage phenotype and mechanistic controls (H4 acetylation, apoptosis excluded); clean in vivo KO","pmids":["31671403"],"is_preprint":false},{"year":2020,"finding":"Mcrs1 binds to the Six1 transcription factor (confirmed in cultured cells and embryonic ectoderm) and reduces Six1-Eya1 transcriptional activation. Knockdown of Mcrs1 in Xenopus embryos causes expansion of neural plate gene domains, reduction of pre-migratory neural crest genes (foxd3, sox9), and pleiotropic effects on cranial placode genes. Double knockdown and rescue experiments establish a functional interaction between Mcrs1 and Six1 required for otic vesicle development.","method":"Co-immunoprecipitation (Mcrs1–Six1 binding), transcriptional reporter assay (Six1-Eya1 activity), antisense morpholino knockdown in Xenopus, rescue experiments, in situ hybridization for lineage markers","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — physical interaction confirmed by co-IP, transcriptional function validated by reporter assay, in vivo loss-of-function with epistasis/rescue; multiple orthogonal methods","pmids":["32891623"],"is_preprint":false},{"year":2022,"finding":"Mcrs1 localizes to spindle poles and chromosomes of mouse oocytes during meiosis I. Depletion of Mcrs1 alters HDAC2-mediated H4K16ac, H3K4me2, and H3K9me2 chromatin modifications in NSN-type oocytes, reduces CDK1 activity and cyclin B1 accumulation causing G2/M transition delay, and results in abnormal spindle assembly due to reduced Aurora kinase (Aurka, Aurkc) and Kif2A activities.","method":"siRNA knockdown in mouse oocytes, immunofluorescence (spindle localization), histone modification immunostaining, CDK1 activity assay, western blot (cyclin B1), Aurora kinase and Kif2A activity assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with multiple mechanistic readouts (histone modifications, kinase activities, spindle morphology) in a single rigorous study using orthogonal methods","pmids":["36951681"],"is_preprint":false},{"year":2022,"finding":"Silencing MCRS1 increases the proportion of open (versus closed) microtubule minus-end morphologies in metaphase HeLa cell spindles as measured by large-scale electron tomography, demonstrating that MCRS1 stabilizes MT minus ends and modulates their structural heterogeneity.","method":"siRNA knockdown of MCRS1, large-scale electron tomography of 3D-reconstructed metaphase spindles in HeLa cells","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ultrastructural electron tomography with quantitative morphology analysis after MCRS1 knockdown; rigorous structural method, single lab","pmids":["36350698"],"is_preprint":false},{"year":2024,"finding":"MCRS1 interacts with the transcription factor YY1 and coordinately increases chromatin accessibility and expression of MHC-I genes, thereby augmenting antigen presentation in pancreatic cancer cells and sensitizing them to T cell-mediated killing and anti-PD-1 therapy.","method":"CRISPR activation screen, co-immunoprecipitation (MCRS1–YY1), ATAC-seq/chromatin accessibility assay, MHC-I expression (flow cytometry/western blot), T cell killing assay, in vivo tumor model with anti-PD-1","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — physical interaction confirmed by co-IP, chromatin accessibility measured by ATAC-seq, functional consequence validated in vitro and in vivo; multiple orthogonal methods","pmids":["39545935"],"is_preprint":false},{"year":2025,"finding":"CRISPRi knockdown of MCRS1 in hiPSC-derived neural progenitors drives precocious neural commitment. MCRS1 represses ZEB1 expression, positioning MCRS1 as a brake on premature neurodevelopment. Gene regulatory network inference identified MCRS1 as a key upstream regulator of the ZEB1-mediated neural differentiation axis.","method":"Pooled CRISPRi screen with single-cell multiomics (scRNA-seq + ATAC-seq), gene regulatory network (GRN) inference, validation in hiPSC-derived neurons","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — high-throughput CRISPRi with multiomics readout is rigorous, but preprint, single study, and the MCRS1→ZEB1 repression is inferred by GRN modeling with validation screens rather than direct biochemical confirmation","pmids":[],"is_preprint":true},{"year":2024,"finding":"MCRS1 (Mcrs1) acts as a bona fide SIX1 co-factor that represses SIX1+EYA transcriptional activity in mouse. MCRS1 can translocate EYA to the nucleus indirectly (in contrast to SOBP which does so directly). MCRS1 and SOBP are co-expressed with SIX1 in the oral domain of the mandibular arch.","method":"Co-immunoprecipitation (MCRS1–SIX1 binding), transcriptional reporter assay (SIX1+EYA activity), nuclear translocation assay, immunofluorescence co-localization in mouse tissue","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — physical interaction and functional transcriptional repression confirmed by co-IP and reporter assay in mouse context; preprint, single lab","pmids":[],"is_preprint":true}],"current_model":"MCRS1 (MSP58/p78) is a multifunctional FHA-domain nucleolar/centrosomal protein that: (1) couples Rheb to mTORC1 activation at lysosomes in an amino acid-dependent manner; (2) stabilizes MT minus ends and regulates mitotic spindle assembly, with its activity tuned by Aurora-A (Ser35/36) and Mps1 phosphorylation to control KIF2A localization and chromosome alignment; (3) forms complexes with transcription factors (p53/BRG1, STRA13, DIPA, Nrf1, Six1, YY1) to regulate gene expression including p21, rDNA, and MHC-I genes; (4) is stabilized by BAP1-mediated de-ubiquitination and degraded via EDD/UBR5-mediated ubiquitin-proteasome pathway; (5) localizes to centriolar satellites to support dynein-dependent cargo transport and ciliogenesis; and (6) is essential for epiblast specification in early mouse embryogenesis."},"narrative":{"mechanistic_narrative":"MCRS1 (MSP58/p78) is a multifunctional FHA-domain protein that partitions between the nucleus/nucleolus and the centrosomal/spindle compartment to coordinate gene expression with cell division [PMID:9654073, PMID:16547491]. Its FHA domain serves as a central interaction hub, mediating binding to PTEN, the bHLH factor STRA13, NDRG2, and centrosomal proteins Nde1 and Su48, with FHA-dependent docking also required for centrosomal targeting [PMID:15659546, PMID:15719173, PMID:16547491, PMID:17109818]. In the nucleolus MCRS1 partners with RINT-1 at the rDNA promoter to control rRNA synthesis, and its dual nuclear/nucleolar localization signals and importin α binding are required for transcriptional regulation of p21 and ribosomal genes [PMID:25981436, PMID:27530925]. As a transcriptional co-regulator it assembles a p53/BRG1 ternary complex to activate p21 and drive p53-dependent senescence, represses Nrf1- and DIPA-dependent transcription, and modulates SIX1/EYA, YY1, and ZEB1 transcriptional programs governing antigen presentation, neural crest/placode fate, and neural commitment [PMID:19187526, PMID:22563078, PMID:32891623, PMID:39545935]. At the mitotic and meiotic spindle MCRS1 stabilizes microtubule minus ends and tunes kinetochore-fiber dynamics, with this activity gated by Aurora-A (Ser35/36) and Mps1 phosphorylation that control KIF2A minus-end localization and chromosome alignment [PMID:27192185, PMID:30785839, PMID:36350698]. MCRS1 abundance is set by an opposing ubiquitin cycle: the HECT E3 ligase EDD/UBR5 targets it for proteasomal degradation while the deubiquitinase BAP1 stabilizes it to maintain chromosome stability [PMID:23069210, PMID:26300492]. MCRS1 also couples amino-acid signaling to growth by maintaining Rheb at lysosomes to enable mTORC1 activation [PMID:25816988], localizes to centriolar satellites to support dynein-dependent cargo transport and ciliogenesis [PMID:27263857], and is essential for epiblast specification in early mouse embryogenesis [PMID:31671403].","teleology":[{"year":1998,"claim":"Established MCRS1/MSP58 as a nucleolar protein with a defined physical partner, anchoring it to ribosomal/nucleolar biology before any functional role was known.","evidence":"Yeast two-hybrid, Sf9 co-expression and deletion mapping of the MSP58–p120 interaction, with nucleolar imaging in COS-7 cells","pmids":["9654073"],"confidence":"High","gaps":["Functional consequence of p120 binding undefined","No link yet between nucleolar localization and a cellular process"]},{"year":2004,"claim":"Linked an MCRS1 splice variant to telomere homeostasis, showing a cell-cycle-regulated role beyond static nucleolar residence.","evidence":"Reciprocal binding to LPTS/PinX1, telomerase activity assays and long-term telomere shortening in SMMC-7721 cells","pmids":["15044100"],"confidence":"High","gaps":["Mechanism by which MCRS2 inhibits telomerase not resolved","Relationship between the MCRS2 variant and full-length MCRS1 function unclear"]},{"year":2005,"claim":"Defined the FHA domain as the protein-interaction module and connected MCRS1 to tumor suppression and transcription, framing it as a transformation-relevant hub.","evidence":"Co-IP and point-mutant analysis mapping PTEN C-terminus to the MSP58 FHA domain (focus-formation rescue), plus FHA-dependent STRA13 binding with reporter and protein-stability assays","pmids":["15659546","15719173"],"confidence":"High","gaps":["How FHA-domain binding suppresses transformation mechanistically not detailed","Phospho-dependence of FHA interactions only partially mapped"]},{"year":2006,"claim":"Revealed a centrosomal pool of MCRS1 and additional nuclear transcriptional partners, establishing its dual nuclear/centrosomal lifestyle and FHA-dependent centrosome targeting.","evidence":"Y2H/co-IP/GST pull-down with Nde1, Su48, DIPA and NDRG2; FHA-dependent centrosomal localization imaging; siRNA knockdown causing cell death and mitotic delay","pmids":["16547491","17014843","17109818"],"confidence":"High","gaps":["Molecular function of MCRS1 at the centrosome not yet defined","Transcriptional targets of DIPA/NDRG2 complexes unidentified"]},{"year":2009,"claim":"Extended MCRS1's transcriptional co-regulator role to repression of a specific bZIP factor, generalizing it as a context-dependent modulator of distinct transcription factors.","evidence":"Y2H, GST pull-down, co-IP and luciferase reporter assays mapping the MCRS2–Nrf1 interaction and repression","pmids":["19187526"],"confidence":"High","gaps":["Endogenous Nrf1 target genes affected not identified","Whether repression is direct or via recruited corepressors unknown"]},{"year":2010,"claim":"Connected MCRS1 to general transcription machinery, showing it associates with RNA Pol II and promotes its promoter recruitment.","evidence":"Co-purification with RNAP II, ChIP showing 5'-gene occupancy and cyclin gene expression effects in Drosophila","pmids":["20679484"],"confidence":"High","gaps":["Whether human MCRS1 directly contacts Pol II not established","Mechanism of Pol II recruitment unresolved"]},{"year":2012,"claim":"Placed MCRS1 within the p53/p21 senescence axis and identified its degradation pathway, defining both its action on a key tumor suppressor and how its own levels are controlled.","evidence":"ChIP/co-IP of the p53–BRG1–MSP58 ternary complex with p53-dependent senescence assays; in vitro/in vivo EDD(UBR5) binding, ubiquitination and half-life measurements","pmids":["22563078","23069210"],"confidence":"High","gaps":["Signals controlling EDD-mediated MCRS1 turnover unknown","How MCRS1 is recruited to the p21 promoter not fully mapped"]},{"year":2015,"claim":"Resolved the trafficking determinants and a deubiquitinase partner of MCRS1, and uncovered an unexpected cytoplasmic role coupling amino acids to mTORC1.","evidence":"NLS/NoLS mutagenesis and importin binding; BAP1 deubiquitination and stability assays; siRNA and Cre/Lox KO showing AA-dependent Rheb retention at lysosomes and mTORC1 control","pmids":["25981436","26300492","25816988"],"confidence":"High","gaps":["How MCRS1 physically anchors Rheb at lysosomes not defined","Coordination between nuclear and lysosomal pools of MCRS1 unknown"]},{"year":2016,"claim":"Established MCRS1 as a microtubule minus-end and centriolar-satellite factor whose mitotic activity is gated by Aurora-A, linking its centrosomal localization to spindle function and ciliogenesis.","evidence":"RINT-1 co-IP/ChIP at rDNA; dynein co-IP, centriolar satellite imaging and zebrafish mcrs1 mutant phenotypes; in vitro Aurora-A phosphorylation of Ser35/36 with mitotic functional assays","pmids":["27530925","27263857","27192185"],"confidence":"High","gaps":["Direct biochemical mechanism of minus-end stabilization not defined","How Aurora-A phosphorylation alters MCRS1 activity at the molecular level unresolved"]},{"year":2019,"claim":"Identified Mps1 as a second mitotic kinase regulating MCRS1 and defined KIF2A as a downstream effector, mechanistically connecting MCRS1 phosphorylation to chromosome alignment.","evidence":"Co-IP and in vitro kinase assays for Mps1–MCRS1, KIF2A localization imaging and chromosome alignment assays; plus Pkmyt1 interaction in gastric cancer cells","pmids":["30785839","30953699"],"confidence":"High","gaps":["How MCRS1 directs KIF2A specifically to minus ends not detailed","Integration of Aurora-A and Mps1 inputs on MCRS1 unknown"]},{"year":2020,"claim":"Demonstrated organismal-level requirements for MCRS1 in early embryogenesis and lineage-specific transcriptional control via SIX1.","evidence":"Conditional Mcrs1 mouse KO with epiblast-specific outgrowth failure; Mcrs1–Six1 co-IP, reporter repression and Xenopus morpholino knockdown affecting neural crest/placode genes","pmids":["31671403","32891623"],"confidence":"High","gaps":["Molecular cause of epiblast-specific defect not identified","Whether embryonic phenotypes reflect transcriptional vs spindle functions unresolved"]},{"year":2022,"claim":"Provided ultrastructural proof that MCRS1 stabilizes spindle MT minus ends and extended its meiotic role through chromatin and kinase regulation in oocytes.","evidence":"Large-scale electron tomography of HeLa spindles after MCRS1 silencing; siRNA in mouse oocytes linking Mcrs1 to HDAC2/histone marks, CDK1/cyclin B1 and Aurora/Kif2A activities","pmids":["36350698","36951681"],"confidence":"High","gaps":["Direct binding partners mediating minus-end stabilization not identified","Mechanism connecting Mcrs1 to oocyte chromatin modifications unclear"]},{"year":2024,"claim":"Expanded MCRS1's transcriptional repertoire to immune evasion and developmental gene control, showing chromatin-level effects on MHC-I and SIX1/EYA programs.","evidence":"CRISPRa screen, YY1 co-IP, ATAC-seq and T-cell/anti-PD-1 models for MHC-I; MCRS1–SIX1 co-IP, reporter repression and EYA nuclear translocation assays (preprint)","pmids":["39545935"],"confidence":"High","gaps":["How MCRS1 increases chromatin accessibility at MHC-I loci not mechanistically defined","Whether YY1 and SIX1 effects share a common chromatin mechanism unknown"]},{"year":2025,"claim":"Positioned MCRS1 as an upstream brake on neural commitment via ZEB1 repression, broadening its developmental gene-regulatory role.","evidence":"Pooled CRISPRi with single-cell multiomics and GRN inference in hiPSC-derived neural progenitors (preprint)","pmids":[],"confidence":"Medium","gaps":["MCRS1→ZEB1 repression inferred by GRN modeling without direct biochemical confirmation","Preprint, single study not independently replicated"]},{"year":null,"claim":"How MCRS1 mechanistically stabilizes microtubule minus ends and whether its nuclear/transcriptional, lysosomal mTORC1, and spindle activities are independent or coordinated remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of MCRS1 at the MT minus end","No unifying mechanism linking its distinct subcellular roles","Direct effectors of minus-end stabilization unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[9,7,16,20,23]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[22,17,14]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[11]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,14]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[0,13,16]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,5,7,13]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[4,14]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[22,15,17]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[10,15,17,22]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[9,16,23]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[19,20]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[23]}],"complexes":["centriolar satellites","p53–BRG1 transcriptional complex","centrosome"],"partners":["PTEN","STRA13","NDE1","RINT1","UBR5","BAP1","SIX1","YY1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96EZ8","full_name":"Microspherule protein 1","aliases":["58 kDa microspherule protein","Cell cycle-regulated factor p78","INO80 complex subunit J","MCRS2"],"length_aa":462,"mass_kda":51.8,"function":"Modulates the transcription repressor activity of DAXX by recruiting it to the nucleolus (PubMed:11948183). As part of the NSL complex, may be involved in acetylation of nucleosomal histone H4 on several lysine residues (PubMed:20018852). Putative regulatory component of the chromatin remodeling INO80 complex which is involved in transcriptional regulation, DNA replication and probably DNA repair. May also be an inhibitor of TERT telomerase activity (PubMed:15044100). Binds to G-quadruplex structures in mRNA (PubMed:16571602). Binds to RNA homomer poly(G) and poly(U) (PubMed:16571602). Maintains RHEB at the lysosome in its active GTP-bound form and prevents its interaction with the mTORC1 complex inhibitor TSC2, ensuring activation of the mTORC1 complex by RHEB (PubMed:25816988). Stabilizes the minus ends of kinetochore fibers by protecting them from depolymerization, ensuring functional spindle assembly during mitosis (PubMed:22081094, PubMed:27192185). Following phosphorylation by TTK/MPS1, enhances recruitment of KIF2A to the minus ends of mitotic spindle microtubules which promotes chromosome alignment (PubMed:30785839). Regulates the morphology of microtubule minus ends in mitotic spindle by maintaining them in a closed conformation characterized by the presence of an electron-dense cap (PubMed:36350698). Regulates G2/M transition and spindle assembly during oocyte meiosis (By similarity). Mediates histone modifications and transcriptional regulation in germinal vesicle oocytes which are required for meiotic progression (By similarity). Also regulates microtubule nucleation and spindle assembly by activating aurora kinases during oocyte meiosis (By similarity). Contributes to the establishment of centriolar satellites and also plays a role in primary cilium formation by recruiting TTBK2 to the mother centriole which is necessary for removal of the CP110 cap from the mother centriole, an early step in ciliogenesis (PubMed:27263857). Required for epiblast development during early embryogenesis (By similarity). Essential for cell viability (PubMed:16547491)","subcellular_location":"Nucleus; Nucleus, nucleolus; Cytoplasm; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, spindle pole; Chromosome, centromere, kinetochore; Chromosome; Lysosome; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriolar satellite","url":"https://www.uniprot.org/uniprotkb/Q96EZ8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/MCRS1","classification":"Common Essential","n_dependent_lines":955,"n_total_lines":1208,"dependency_fraction":0.7905629139072847},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MCRS1","total_profiled":1310},"omim":[{"mim_id":"615488","title":"KAT8 REGULATORY NSL COMPLEX, SUBUNIT 2; KANSL2","url":"https://www.omim.org/entry/615488"},{"mim_id":"609504","title":"MICROSPHERULE PROTEIN 1; MCRS1","url":"https://www.omim.org/entry/609504"},{"mim_id":"603277","title":"CHROMODOMAIN HELICASE DNA-BINDING PROTEIN 4; CHD4","url":"https://www.omim.org/entry/603277"},{"mim_id":"602165","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 27; TRIM27","url":"https://www.omim.org/entry/602165"},{"mim_id":"600673","title":"UPSTREAM BINDING TRANSCRIPTION FACTOR (RNA POLYMERASE I); UBTF","url":"https://www.omim.org/entry/600673"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MCRS1"},"hgnc":{"alias_symbol":["ICP22BP","MSP58","P78","MCRS2","INO80Q"],"prev_symbol":[]},"alphafold":{"accession":"Q96EZ8","domains":[{"cath_id":"2.60.200.20","chopping":"346-458","consensus_level":"high","plddt":92.4988,"start":346,"end":458},{"cath_id":"1.10.10","chopping":"136-204","consensus_level":"medium","plddt":94.9139,"start":136,"end":204},{"cath_id":"1.10.10","chopping":"210-260","consensus_level":"medium","plddt":92.3918,"start":210,"end":260}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96EZ8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96EZ8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96EZ8-F1-predicted_aligned_error_v6.png","plddt_mean":74.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MCRS1","jax_strain_url":"https://www.jax.org/strain/search?query=MCRS1"},"sequence":{"accession":"Q96EZ8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96EZ8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96EZ8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96EZ8"}},"corpus_meta":[{"pmid":"15659546","id":"PMC_15659546","title":"Cellular 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MSP58 localizes to microspherules in the nucleolus, and overexpression causes irregular nucleolar enlargement in COS-7 cells.\",\n      \"method\": \"Yeast two-hybrid, recombinant protein co-expression in insect Sf9 cells, deletion mutagenesis, immunofluorescence\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — yeast two-hybrid confirmed by in vitro reconstitution in Sf9 cells, domain mapping by deletion mutagenesis, and localization imaging; multiple orthogonal methods in one study\",\n      \"pmids\": [\"9654073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MCRS2 (splice variant of MCRS1/p78) interacts with the telomerase-inhibitory protein LPTS/PinX1 in vitro and in vivo, co-localizes with LPTS/PinX1 in cells, inhibits telomerase activity in vitro, and its long-term overexpression progressively shortens telomeres in SMMC-7721 cells. MCRS2 expression is cell-cycle dependent, accumulating in early S phase.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation, immunofluorescence co-localization, telomerase activity assay, telomere length measurement\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal in vitro and in vivo binding confirmed, functional telomerase inhibition assay, and long-term telomere shortening phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"15044100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The PTEN C-terminal domain physically interacts with the forkhead-associated (FHA) domain of MSP58 (MCRS1), requiring PTEN Thr-366. This interaction suppresses MSP58-driven cellular transformation, as PTEN(T366A) mutant fails to suppress MSP58-induced foci formation, while catalytically inactive PTEN (G129R) retains suppressive activity, demonstrating the C-terminal interaction (not phosphatase activity) is responsible.\",\n      \"method\": \"Co-immunoprecipitation, focus-formation assay in Pten-/- MEFs, point-mutant analysis (T366A, G129R)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — physical interaction mapped by co-IP, functional consequence validated by point mutations in both proteins, cell-based transformation assay with rigorous controls\",\n      \"pmids\": [\"15659546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MSP58 (MCRS1) interacts with the bHLH transcription factor STRA13 through the basic domain of STRA13 and the FHA domain of MSP58; this interaction is modulated by STRA13 phosphorylation status. Complex formation protects both proteins from proteasome-mediated degradation, extending their half-lives. MSP58 and STRA13 synergistically repress STRA13 promoter-driven transcription and both proteins accumulate during S phase.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, phospho-peptide mapping, proteasome inhibitor experiments, luciferase reporter assay, cell-cycle expression analysis\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, domain mapping, functional reporter assay, and protein stability experiments in a single study with multiple orthogonal methods\",\n      \"pmids\": [\"15719173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"p78/MCRS1 associates with centrosomal proteins Nde1 and Su48; the FHA domain of p78 is required for these interactions and for centrosomal localization. A fraction of p78 localizes to the centrosome (in addition to the nucleus). The Nde1-p78 interaction is regulated by phosphorylation of Nde1. siRNA knockdown of p78 causes cell death and a modest mitotic delay.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, immunofluorescence (centrosome localization), domain mapping, siRNA knockdown with viability and cell-cycle assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid confirmed by co-IP, domain mapping, direct localization imaging, phosphorylation-dependent regulation, and functional knockdown phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"16547491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DIPA (delta-interacting protein A) physically associates with p78/MCRS1/MSP58 as shown by co-immunoprecipitation; the structural regions mediating the interaction were identified. DIPA co-localizes predominantly with p78 in the nucleus, and DIPA acts as a repressor of gene transcription, an activity enhanced by p78.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, immunofluorescence co-localization, transcriptional reporter assay\",\n      \"journal\": \"Experimental and molecular pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with domain mapping and functional transcription reporter, single lab\",\n      \"pmids\": [\"17014843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NDRG2 interacts with MSP58 (MCRS1); the FHA domain of MSP58 is essential for this interaction. NDRG2 co-localizes with MSP58 in the nucleus of HeLa cells during cell stress. Modulation of NDRG2 levels influences cell cycle progression together with MSP58.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence co-localization, cell cycle analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interaction confirmed by three methods (Y2H, GST pull-down, co-IP) with domain mapping; functional link to cell cycle is phenotypic without full mechanistic placement\",\n      \"pmids\": [\"17109818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MCRS2 (isoform of MCRS1) directly interacts with the CNC-bZIP transcription factor Nrf1; the interaction domains were mapped to residues 354–447 of Nrf1 and residues 314–475 of MCRS2. MCRS2 co-localizes with Nrf1 in the nucleus and represses Nrf1-mediated transcriptional activation in reporter assays.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence, luciferase reporter assay\",\n      \"journal\": \"BMC cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — interaction confirmed by three orthogonal binding methods with domain mapping, and transcriptional repression validated functionally\",\n      \"pmids\": [\"19187526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Drosophila MCRS2 (ortholog of human MCRS1/MCRS2) co-purifies with RNA polymerase II complexes, localizes to the 5' ends of genes, and is required for optimal recruitment of RNAP II to promoter regions of cyclin genes and for normal cyclin gene expression levels.\",\n      \"method\": \"Co-purification/co-IP with RNAP II, chromatin immunoprecipitation (ChIP), RNA expression analysis, genetic knockdown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct co-purification with RNAP II, ChIP showing promoter occupancy, and functional gene expression phenotype; multiple orthogonal methods in a peer-reviewed study\",\n      \"pmids\": [\"20679484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MSP58 (MCRS1) forms a ternary complex with p53 and BRG1 (SWI/SNF subunit) on the p21 promoter to activate p21 transcription. MSP58 also activates the DNA damage response and p53/p21 signaling pathways. MSP58-induced senescence strictly requires functional p53; cells with p53 knockdown or mutant p53 bypass MSP58-induced senescence.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), co-immunoprecipitation (ternary complex), shRNA knockdown of p53, ectopic overexpression, senescence assays (β-galactosidase), western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrates promoter occupancy of ternary complex, co-IP confirms interaction, p53 dependency established by two genetic approaches; multiple orthogonal methods\",\n      \"pmids\": [\"22563078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"EDD (UBR5), a HECT-domain ubiquitin E3 ligase, directly interacts with MSP58 (MCRS1) in vitro and in vivo. EDD depletion increases MSP58 protein levels and extends its half-life. MSP58 is ubiquitinated and degraded via the ubiquitin-proteasome pathway. Knockdown of either MSP58 or EDD alters cyclin B, D, and E levels and cell cycle progression.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assay, proteasome inhibitor (MG132) treatment, ubiquitination assay, siRNA knockdown with western blot and cell cycle analysis\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct in vitro binding confirmed, E3 ligase-substrate relationship established by half-life and ubiquitination experiments with multiple methods\",\n      \"pmids\": [\"23069210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MCRS1 is an essential link between Rheb and mTORC1 activation by amino acids (AAs). In an AA-dependent manner, MCRS1 maintains Rheb at lysosome surfaces. MCRS1 depletion (siRNA or Cre/Lox in MEFs) reduces mTORC1 activity, promotes Rheb–TSC2 interaction (rendering Rheb inactive), and delocalizes Rheb from lysosomes to recycling endocytic vesicles.\",\n      \"method\": \"siRNA knockdown, inducible Cre/Lox knockout in MEFs, co-immunoprecipitation, immunofluorescence (lysosomal localization of Rheb), mTORC1 activity assays, amino acid stimulation/deprivation\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent loss-of-function systems (siRNA and Cre/Lox KO), multiple co-IP interactions measured, subcellular localization changes quantified, pathway position validated by AA-dependence experiments\",\n      \"pmids\": [\"25816988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BAP1, a nuclear de-ubiquitinating enzyme, binds MCRS1 and stabilizes it by removing ubiquitin chains (de-ubiquitination), thereby preventing proteasomal degradation of MCRS1. BAP1 contributes to chromosome stability partially through MCRS1. MCRS1 is a component of centrosomal proteins and plays an essential role in spindle assembly.\",\n      \"method\": \"Co-immunoprecipitation, de-ubiquitination assay, BAP1 knockdown/knockout with MCRS1 stability measurement, chromosome instability assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — writer/eraser identified (BAP1 as DUB for MCRS1), substrate relationship supported by co-IP and functional stability assays; single lab but multiple methods\",\n      \"pmids\": [\"26300492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MSP58 (MCRS1) contains two nuclear localization signals (NLS1: residues 32–56; NLS2: residues 113–123) and a bipartite nucleolar localization signal within NLS1 (residues 44–56). MSP58 binds importin α1 and α6, indicating receptor-mediated nuclear import. Both nuclear and nucleolar localization are required for MSP58-mediated transcriptional regulation of p21 and ribosomal RNA genes.\",\n      \"method\": \"Deletion/mutation analysis of NLS/NoLS, yeast two-hybrid, GST pull-down, co-immunoprecipitation with importins, reporter assays, immunofluorescence\",\n      \"journal\": \"Journal of biomedical science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — NLS mapped by mutagenesis, importin binding confirmed by three methods, functional transcriptional consequences linked to specific localization signals\",\n      \"pmids\": [\"25981436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MCRS1 localizes to centriolar satellites and is required for dynein-dependent cargo transport to the centrosome. MCRS1 knockdown disperses centriolar satellites. MCRS1 plays a positive role in ciliogenesis initiation, possibly through interaction with TTBK2. Zebrafish mcrs1 mutants show brain/eye size reduction due to apoptosis, defective retinal layering, melanosome aggregation defects, and reduced ciliogenesis — phenotypes resembling dynein mutants. Additionally, MCRS1 directly associates with cytoplasmic dynein.\",\n      \"method\": \"siRNA knockdown, immunofluorescence (centriolar satellite localization), zebrafish mcrs1 mutant phenotype analysis, co-immunoprecipitation with dynein components, ciliogenesis assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — localization tied to functional consequence (satellite dispersion), in vivo mutant phenotype in zebrafish, direct dynein binding by co-IP; multiple orthogonal methods\",\n      \"pmids\": [\"27263857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Aurora-A kinase phosphorylates MCRS1 on Ser35/36 during mitosis. This phosphorylation does not affect MCRS1 localization to chromosomal MTs or K-fiber minus-ends, but regulates MCRS1 activity in mitosis, particularly in tuning kinetochore fiber (K-fiber) minus-end dynamics.\",\n      \"method\": \"In vitro kinase assay, phospho-site mutagenesis, immunofluorescence, siRNA-based functional assays in mitosis\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro phosphorylation demonstrated and mutant phenotype characterized, but abstract lacks full mechanistic follow-up detail; single lab\",\n      \"pmids\": [\"27192185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MCRS1 (MSP58) directly interacts with RINT-1 in vitro and in vivo; both proteins co-localize with UBF in the nucleolus. Overexpression of either MSP58 or RINT-1 decreases rRNA expression and rDNA promoter activity, while co-expression produces a greater decrease. Both MSP58 and RINT-1 associate with the rDNA promoter as shown by ChIP.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding, co-immunoprecipitation, immunofluorescence co-localization, rRNA expression assays, rDNA promoter reporter assay, chromatin immunoprecipitation (ChIP)\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — interaction confirmed by multiple binding assays, ChIP demonstrates direct promoter occupancy, functional rRNA/reporter assays; multiple orthogonal methods\",\n      \"pmids\": [\"27530925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mps1 kinase binds and phosphorylates MCRS1, enabling KIF2A localization to the minus end of spindle microtubules, thereby regulating chromosome alignment. MCRS1 controls the dynamics of the minus end of kinetochore microtubules.\",\n      \"method\": \"Co-immunoprecipitation (Mps1–MCRS1 binding), in vitro kinase assay (phosphorylation), immunofluorescence (KIF2A localization), siRNA/inhibitor-based functional assays (chromosome alignment)\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — kinase-substrate relationship established in vitro and in vivo, downstream localization consequence shown by imaging; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"30785839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MCRS1 physically interacts with Pkmyt1 (a WEE1-family kinase) in vitro and the two proteins co-localize in the cytoplasm. Overexpression of MCRS1 inhibits growth, invasion and migration of gastric cancer cells and suppresses Pkmyt1 expression, while downregulation of MCRS1 promotes these phenotypes; inhibition of WEE1/Pkmyt1 with MK1775 rescues the MCRS1-knockdown phenotype.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, overexpression/knockdown cell assays, kinase inhibitor (MK1775) epistasis\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — physical interaction confirmed by co-IP with co-localization, epistasis with kinase inhibitor; single lab with moderate mechanistic depth\",\n      \"pmids\": [\"30953699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MCRS1 is essential for epiblast development in early murine embryogenesis. Mcrs1 mutant embryos show normal blastocyst morphology but fail to form an inner cell mass colony in outgrowth assays; trophoblast and primitive endoderm are properly specified, but the epiblast lineage is specifically compromised with severely reduced cell number. Global H4 acetylation and apoptosis are normal in mutant blastocysts.\",\n      \"method\": \"Conditional Mcrs1 knockout mouse, outgrowth assays, lineage marker immunostaining, histone H4 acetylation analysis, apoptosis assay\",\n      \"journal\": \"Reproduction (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function in vivo with specific lineage phenotype and mechanistic controls (H4 acetylation, apoptosis excluded); clean in vivo KO\",\n      \"pmids\": [\"31671403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Mcrs1 binds to the Six1 transcription factor (confirmed in cultured cells and embryonic ectoderm) and reduces Six1-Eya1 transcriptional activation. Knockdown of Mcrs1 in Xenopus embryos causes expansion of neural plate gene domains, reduction of pre-migratory neural crest genes (foxd3, sox9), and pleiotropic effects on cranial placode genes. Double knockdown and rescue experiments establish a functional interaction between Mcrs1 and Six1 required for otic vesicle development.\",\n      \"method\": \"Co-immunoprecipitation (Mcrs1–Six1 binding), transcriptional reporter assay (Six1-Eya1 activity), antisense morpholino knockdown in Xenopus, rescue experiments, in situ hybridization for lineage markers\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — physical interaction confirmed by co-IP, transcriptional function validated by reporter assay, in vivo loss-of-function with epistasis/rescue; multiple orthogonal methods\",\n      \"pmids\": [\"32891623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Mcrs1 localizes to spindle poles and chromosomes of mouse oocytes during meiosis I. Depletion of Mcrs1 alters HDAC2-mediated H4K16ac, H3K4me2, and H3K9me2 chromatin modifications in NSN-type oocytes, reduces CDK1 activity and cyclin B1 accumulation causing G2/M transition delay, and results in abnormal spindle assembly due to reduced Aurora kinase (Aurka, Aurkc) and Kif2A activities.\",\n      \"method\": \"siRNA knockdown in mouse oocytes, immunofluorescence (spindle localization), histone modification immunostaining, CDK1 activity assay, western blot (cyclin B1), Aurora kinase and Kif2A activity assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with multiple mechanistic readouts (histone modifications, kinase activities, spindle morphology) in a single rigorous study using orthogonal methods\",\n      \"pmids\": [\"36951681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Silencing MCRS1 increases the proportion of open (versus closed) microtubule minus-end morphologies in metaphase HeLa cell spindles as measured by large-scale electron tomography, demonstrating that MCRS1 stabilizes MT minus ends and modulates their structural heterogeneity.\",\n      \"method\": \"siRNA knockdown of MCRS1, large-scale electron tomography of 3D-reconstructed metaphase spindles in HeLa cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ultrastructural electron tomography with quantitative morphology analysis after MCRS1 knockdown; rigorous structural method, single lab\",\n      \"pmids\": [\"36350698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MCRS1 interacts with the transcription factor YY1 and coordinately increases chromatin accessibility and expression of MHC-I genes, thereby augmenting antigen presentation in pancreatic cancer cells and sensitizing them to T cell-mediated killing and anti-PD-1 therapy.\",\n      \"method\": \"CRISPR activation screen, co-immunoprecipitation (MCRS1–YY1), ATAC-seq/chromatin accessibility assay, MHC-I expression (flow cytometry/western blot), T cell killing assay, in vivo tumor model with anti-PD-1\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — physical interaction confirmed by co-IP, chromatin accessibility measured by ATAC-seq, functional consequence validated in vitro and in vivo; multiple orthogonal methods\",\n      \"pmids\": [\"39545935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRISPRi knockdown of MCRS1 in hiPSC-derived neural progenitors drives precocious neural commitment. MCRS1 represses ZEB1 expression, positioning MCRS1 as a brake on premature neurodevelopment. Gene regulatory network inference identified MCRS1 as a key upstream regulator of the ZEB1-mediated neural differentiation axis.\",\n      \"method\": \"Pooled CRISPRi screen with single-cell multiomics (scRNA-seq + ATAC-seq), gene regulatory network (GRN) inference, validation in hiPSC-derived neurons\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — high-throughput CRISPRi with multiomics readout is rigorous, but preprint, single study, and the MCRS1→ZEB1 repression is inferred by GRN modeling with validation screens rather than direct biochemical confirmation\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MCRS1 (Mcrs1) acts as a bona fide SIX1 co-factor that represses SIX1+EYA transcriptional activity in mouse. MCRS1 can translocate EYA to the nucleus indirectly (in contrast to SOBP which does so directly). MCRS1 and SOBP are co-expressed with SIX1 in the oral domain of the mandibular arch.\",\n      \"method\": \"Co-immunoprecipitation (MCRS1–SIX1 binding), transcriptional reporter assay (SIX1+EYA activity), nuclear translocation assay, immunofluorescence co-localization in mouse tissue\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — physical interaction and functional transcriptional repression confirmed by co-IP and reporter assay in mouse context; preprint, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"MCRS1 (MSP58/p78) is a multifunctional FHA-domain nucleolar/centrosomal protein that: (1) couples Rheb to mTORC1 activation at lysosomes in an amino acid-dependent manner; (2) stabilizes MT minus ends and regulates mitotic spindle assembly, with its activity tuned by Aurora-A (Ser35/36) and Mps1 phosphorylation to control KIF2A localization and chromosome alignment; (3) forms complexes with transcription factors (p53/BRG1, STRA13, DIPA, Nrf1, Six1, YY1) to regulate gene expression including p21, rDNA, and MHC-I genes; (4) is stabilized by BAP1-mediated de-ubiquitination and degraded via EDD/UBR5-mediated ubiquitin-proteasome pathway; (5) localizes to centriolar satellites to support dynein-dependent cargo transport and ciliogenesis; and (6) is essential for epiblast specification in early mouse embryogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MCRS1 (MSP58/p78) is a multifunctional FHA-domain protein that partitions between the nucleus/nucleolus and the centrosomal/spindle compartment to coordinate gene expression with cell division [#0, #4]. Its FHA domain serves as a central interaction hub, mediating binding to PTEN, the bHLH factor STRA13, NDRG2, and centrosomal proteins Nde1 and Su48, with FHA-dependent docking also required for centrosomal targeting [#2, #3, #4, #6]. In the nucleolus MCRS1 partners with RINT-1 at the rDNA promoter to control rRNA synthesis, and its dual nuclear/nucleolar localization signals and importin α binding are required for transcriptional regulation of p21 and ribosomal genes [#13, #16]. As a transcriptional co-regulator it assembles a p53/BRG1 ternary complex to activate p21 and drive p53-dependent senescence, represses Nrf1- and DIPA-dependent transcription, and modulates SIX1/EYA, YY1, and ZEB1 transcriptional programs governing antigen presentation, neural crest/placode fate, and neural commitment [#7, #9, #20, #23]. At the mitotic and meiotic spindle MCRS1 stabilizes microtubule minus ends and tunes kinetochore-fiber dynamics, with this activity gated by Aurora-A (Ser35/36) and Mps1 phosphorylation that control KIF2A minus-end localization and chromosome alignment [#15, #17, #22]. MCRS1 abundance is set by an opposing ubiquitin cycle: the HECT E3 ligase EDD/UBR5 targets it for proteasomal degradation while the deubiquitinase BAP1 stabilizes it to maintain chromosome stability [#10, #12]. MCRS1 also couples amino-acid signaling to growth by maintaining Rheb at lysosomes to enable mTORC1 activation [#11], localizes to centriolar satellites to support dynein-dependent cargo transport and ciliogenesis [#14], and is essential for epiblast specification in early mouse embryogenesis [#19].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established MCRS1/MSP58 as a nucleolar protein with a defined physical partner, anchoring it to ribosomal/nucleolar biology before any functional role was known.\",\n      \"evidence\": \"Yeast two-hybrid, Sf9 co-expression and deletion mapping of the MSP58–p120 interaction, with nucleolar imaging in COS-7 cells\",\n      \"pmids\": [\"9654073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of p120 binding undefined\", \"No link yet between nucleolar localization and a cellular process\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Linked an MCRS1 splice variant to telomere homeostasis, showing a cell-cycle-regulated role beyond static nucleolar residence.\",\n      \"evidence\": \"Reciprocal binding to LPTS/PinX1, telomerase activity assays and long-term telomere shortening in SMMC-7721 cells\",\n      \"pmids\": [\"15044100\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which MCRS2 inhibits telomerase not resolved\", \"Relationship between the MCRS2 variant and full-length MCRS1 function unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the FHA domain as the protein-interaction module and connected MCRS1 to tumor suppression and transcription, framing it as a transformation-relevant hub.\",\n      \"evidence\": \"Co-IP and point-mutant analysis mapping PTEN C-terminus to the MSP58 FHA domain (focus-formation rescue), plus FHA-dependent STRA13 binding with reporter and protein-stability assays\",\n      \"pmids\": [\"15659546\", \"15719173\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How FHA-domain binding suppresses transformation mechanistically not detailed\", \"Phospho-dependence of FHA interactions only partially mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed a centrosomal pool of MCRS1 and additional nuclear transcriptional partners, establishing its dual nuclear/centrosomal lifestyle and FHA-dependent centrosome targeting.\",\n      \"evidence\": \"Y2H/co-IP/GST pull-down with Nde1, Su48, DIPA and NDRG2; FHA-dependent centrosomal localization imaging; siRNA knockdown causing cell death and mitotic delay\",\n      \"pmids\": [\"16547491\", \"17014843\", \"17109818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular function of MCRS1 at the centrosome not yet defined\", \"Transcriptional targets of DIPA/NDRG2 complexes unidentified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended MCRS1's transcriptional co-regulator role to repression of a specific bZIP factor, generalizing it as a context-dependent modulator of distinct transcription factors.\",\n      \"evidence\": \"Y2H, GST pull-down, co-IP and luciferase reporter assays mapping the MCRS2–Nrf1 interaction and repression\",\n      \"pmids\": [\"19187526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous Nrf1 target genes affected not identified\", \"Whether repression is direct or via recruited corepressors unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected MCRS1 to general transcription machinery, showing it associates with RNA Pol II and promotes its promoter recruitment.\",\n      \"evidence\": \"Co-purification with RNAP II, ChIP showing 5'-gene occupancy and cyclin gene expression effects in Drosophila\",\n      \"pmids\": [\"20679484\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether human MCRS1 directly contacts Pol II not established\", \"Mechanism of Pol II recruitment unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed MCRS1 within the p53/p21 senescence axis and identified its degradation pathway, defining both its action on a key tumor suppressor and how its own levels are controlled.\",\n      \"evidence\": \"ChIP/co-IP of the p53–BRG1–MSP58 ternary complex with p53-dependent senescence assays; in vitro/in vivo EDD(UBR5) binding, ubiquitination and half-life measurements\",\n      \"pmids\": [\"22563078\", \"23069210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals controlling EDD-mediated MCRS1 turnover unknown\", \"How MCRS1 is recruited to the p21 promoter not fully mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved the trafficking determinants and a deubiquitinase partner of MCRS1, and uncovered an unexpected cytoplasmic role coupling amino acids to mTORC1.\",\n      \"evidence\": \"NLS/NoLS mutagenesis and importin binding; BAP1 deubiquitination and stability assays; siRNA and Cre/Lox KO showing AA-dependent Rheb retention at lysosomes and mTORC1 control\",\n      \"pmids\": [\"25981436\", \"26300492\", \"25816988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MCRS1 physically anchors Rheb at lysosomes not defined\", \"Coordination between nuclear and lysosomal pools of MCRS1 unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established MCRS1 as a microtubule minus-end and centriolar-satellite factor whose mitotic activity is gated by Aurora-A, linking its centrosomal localization to spindle function and ciliogenesis.\",\n      \"evidence\": \"RINT-1 co-IP/ChIP at rDNA; dynein co-IP, centriolar satellite imaging and zebrafish mcrs1 mutant phenotypes; in vitro Aurora-A phosphorylation of Ser35/36 with mitotic functional assays\",\n      \"pmids\": [\"27530925\", \"27263857\", \"27192185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical mechanism of minus-end stabilization not defined\", \"How Aurora-A phosphorylation alters MCRS1 activity at the molecular level unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified Mps1 as a second mitotic kinase regulating MCRS1 and defined KIF2A as a downstream effector, mechanistically connecting MCRS1 phosphorylation to chromosome alignment.\",\n      \"evidence\": \"Co-IP and in vitro kinase assays for Mps1–MCRS1, KIF2A localization imaging and chromosome alignment assays; plus Pkmyt1 interaction in gastric cancer cells\",\n      \"pmids\": [\"30785839\", \"30953699\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MCRS1 directs KIF2A specifically to minus ends not detailed\", \"Integration of Aurora-A and Mps1 inputs on MCRS1 unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated organismal-level requirements for MCRS1 in early embryogenesis and lineage-specific transcriptional control via SIX1.\",\n      \"evidence\": \"Conditional Mcrs1 mouse KO with epiblast-specific outgrowth failure; Mcrs1–Six1 co-IP, reporter repression and Xenopus morpholino knockdown affecting neural crest/placode genes\",\n      \"pmids\": [\"31671403\", \"32891623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular cause of epiblast-specific defect not identified\", \"Whether embryonic phenotypes reflect transcriptional vs spindle functions unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided ultrastructural proof that MCRS1 stabilizes spindle MT minus ends and extended its meiotic role through chromatin and kinase regulation in oocytes.\",\n      \"evidence\": \"Large-scale electron tomography of HeLa spindles after MCRS1 silencing; siRNA in mouse oocytes linking Mcrs1 to HDAC2/histone marks, CDK1/cyclin B1 and Aurora/Kif2A activities\",\n      \"pmids\": [\"36350698\", \"36951681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding partners mediating minus-end stabilization not identified\", \"Mechanism connecting Mcrs1 to oocyte chromatin modifications unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Expanded MCRS1's transcriptional repertoire to immune evasion and developmental gene control, showing chromatin-level effects on MHC-I and SIX1/EYA programs.\",\n      \"evidence\": \"CRISPRa screen, YY1 co-IP, ATAC-seq and T-cell/anti-PD-1 models for MHC-I; MCRS1–SIX1 co-IP, reporter repression and EYA nuclear translocation assays (preprint)\",\n      \"pmids\": [\"39545935\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MCRS1 increases chromatin accessibility at MHC-I loci not mechanistically defined\", \"Whether YY1 and SIX1 effects share a common chromatin mechanism unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Positioned MCRS1 as an upstream brake on neural commitment via ZEB1 repression, broadening its developmental gene-regulatory role.\",\n      \"evidence\": \"Pooled CRISPRi with single-cell multiomics and GRN inference in hiPSC-derived neural progenitors (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MCRS1→ZEB1 repression inferred by GRN modeling without direct biochemical confirmation\", \"Preprint, single study not independently replicated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MCRS1 mechanistically stabilizes microtubule minus ends and whether its nuclear/transcriptional, lysosomal mTORC1, and spindle activities are independent or coordinated remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of MCRS1 at the MT minus end\", \"No unifying mechanism linking its distinct subcellular roles\", \"Direct effectors of minus-end stabilization unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [9, 7, 16, 20, 23]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [22, 17, 14]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [0, 13, 16]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 5, 7, 13]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [4, 14]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [22, 15, 17]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [10, 15, 17, 22]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [9, 16, 23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [19, 20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [23]}\n    ],\n    \"complexes\": [\"centriolar satellites\", \"p53–BRG1 transcriptional complex\", \"centrosome\"],\n    \"partners\": [\"PTEN\", \"STRA13\", \"Nde1\", \"RINT1\", \"UBR5\", \"BAP1\", \"SIX1\", \"YY1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}