{"gene":"GINS4","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2005,"finding":"GINS4/SLD5 was identified as a direct binding partner of PSF1 (GINS1), interacting with a central region of PSF1, and co-localizes with PSF1 when overexpressed, establishing SLD5 as a component of the mammalian GINS complex.","method":"Yeast two-hybrid, co-localization by immunofluorescence","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid and co-localization, single lab, two orthogonal methods","pmids":["16338220"],"is_preprint":false},{"year":2010,"finding":"Drosophila Sld5 (ortholog of GINS4) interacts with Psf1, Psf2, and Mcm10 within the GINS/CMG complex, and loss-of-function mutations in Sld5 cause M and S phase delays with chromosomal instability, establishing its essential role in DNA replication and genomic integrity in a multicellular organism.","method":"Co-immunoprecipitation, genetic loss-of-function (mutant analysis), cell cycle analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and genetic phenotype, single lab, two orthogonal methods","pmids":["20709026"],"is_preprint":false},{"year":2013,"finding":"Targeted disruption of SLD5 in mice causes defective cell proliferation in the inner cell mass and embryonic lethality at the peri-implantation stage, demonstrating SLD5 is essential for early embryogenesis and cell proliferation in vivo.","method":"Gene knockout in mice, histological analysis","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined cellular phenotype (embryonic lethality), replicated observation consistent with PSF1 knockout phenotype","pmids":["24244394"],"is_preprint":false},{"year":2014,"finding":"Attenuation of SLD5 expression induces DNA damage in both normal and cancer cells; however, delay in DNA repair response and cell cycle restoration following SLD5 knockdown occurs in normal cells but NOT in cancer cells, indicating SLD5 protects against DNA damage and is differentially required for repair in normal vs. cancer cells.","method":"siRNA knockdown, DNA damage assays, cell cycle analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown with defined cellular phenotype, single lab, multiple cell types tested","pmids":["25334017"],"is_preprint":false},{"year":2016,"finding":"GINS4/Sld5 directly interacts with SIK1 (salt-inducible kinase 1) and recruits SIK1 to sites of DNA replication at the onset of S phase; SIK1 then phosphorylates MCM2 at five conserved N-terminal residues, which is essential for MCM helicase activation during DNA replication.","method":"Co-immunoprecipitation, in vitro kinase assay, siRNA knockdown, chromatin immunoprecipitation","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with defined phosphorylation sites, Co-IP, and functional knockdown; single lab but multiple orthogonal methods","pmids":["27592030"],"is_preprint":false},{"year":2017,"finding":"Sld5/GINS4 localizes to centrosomes and is required to maintain centriolar satellites clustered around centrosomes; depletion of Sld5 disperses centriolar satellites throughout the cytoplasm, impairs recruitment of pericentrin to centrosomes, and renders centrosomes unable to resist CENP-E- and Kid-mediated microtubular forces during chromosome congression, leading to monocentriolar and acentriolar spindle poles. HSET (kinesin-14) sustains the traction forces mediating centrosomal fragmentation in Sld5-depleted cells.","method":"siRNA knockdown, immunofluorescence/localization, live-cell imaging, genetic epistasis (co-depletion)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments with functional consequences, epistasis analysis, multiple orthogonal methods in single study","pmids":["29061732"],"is_preprint":false},{"year":2019,"finding":"GINS4 directly binds to Rac1 and CDC42 (demonstrated by Co-IP and GST pull-down), activating these GTPases and their downstream pathways, thereby promoting gastric cancer cell growth and metastasis.","method":"Co-immunoprecipitation, GST pull-down, GTPase activation assays, cDNA array","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding confirmed by GST pull-down and Co-IP, GTPase activity assay, single lab but three orthogonal methods","pmids":["31754397"],"is_preprint":false},{"year":2019,"finding":"LSH (lymphoid-specific helicase) binds to the 3'UTR region of GINS4 mRNA and stabilizes its transcript levels (demonstrated by Co-IP and RNA immunoprecipitation), thereby increasing GINS4 protein expression and promoting lung cancer progression.","method":"Co-immunoprecipitation, RNA immunoprecipitation (RIP), western blot, rescue experiments","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and Co-IP with functional rescue, single lab, two orthogonal methods","pmids":["31253190"],"is_preprint":false},{"year":2019,"finding":"Influenza virus matrix protein M1 directly interacts with SLD5/GINS4 (identified by yeast two-hybrid, confirmed in mammalian cells); this interaction mediates M1-induced host cell cycle blockade at G0/G1 phase. Overexpression of SLD5 partially rescues M1-induced G0/G1 arrest, and SLD5 transgenic mice show higher resistance to influenza infection.","method":"Yeast two-hybrid, co-immunoprecipitation, cell cycle analysis, transgenic mouse model, rescue experiments","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including yeast two-hybrid, Co-IP, in vivo transgenic rescue, single lab","pmids":["31050118"],"is_preprint":false},{"year":2021,"finding":"Matrix proteins of multiple RNA viruses (VSV, SeV, HIV) interact with SLD5/GINS4 and induce G0/G1 cell cycle arrest; overexpression of SLD5 partially rescues this arrest and SLD5 suppresses VSV replication in vitro and in vivo while enhancing type I interferon signaling.","method":"Co-immunoprecipitation, cell cycle analysis, viral replication assays, in vivo experiments, interferon signaling assays","journal":"The Journal of general virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional rescue, single lab, consistent with prior M1/SLD5 study","pmids":["34882534"],"is_preprint":false},{"year":2022,"finding":"Partial loss-of-function compound heterozygous mutations in GINS4 impair expression and assembly of the GINS complex, causing delayed cell cycle progression without increased replication stress. GINS4 knockdown in differentiating NK cells in vitro demonstrates a cell-intrinsic defect in NK cell development, establishing GINS4 as necessary for NK cell and neutrophil development.","method":"Exome sequencing, patient-derived cell analysis, GINS4 knockdown, cell cycle analysis, in vitro NK cell differentiation assay","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetics combined with functional knockdown in primary cells and in vitro differentiation model, multiple orthogonal approaches","pmids":["36345943"],"is_preprint":false},{"year":2023,"finding":"GINS4 suppresses p53 stability by activating Snail, which antagonizes acetylation of p53 at lysine residue K351; this destabilization of p53 inhibits ferroptosis. CRISPR/Cas9-mediated GINS4 knockout facilitates ferroptosis in lung adenocarcinoma cells, particularly in G2/M cells.","method":"CRISPR/Cas9 knockout, ferroptosis assays, Co-immunoprecipitation, p53 acetylation assays, site-directed mutagenesis (K351)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — CRISPR KO, mutagenesis of specific residue (K351), Co-IP, and functional ferroptosis assay; single lab with multiple orthogonal methods","pmids":["37018198"],"is_preprint":false},{"year":2025,"finding":"GINS4 directly interacts with POLE2 (DNA polymerase epsilon subunit 2); GINS4 silencing inhibits POLE2 expression, leading to suppression of PI3K/AKT signaling, reduced HCC cell proliferation and cell cycle progression, and promotion of ferroptosis. POLE2 overexpression reverses the effects of GINS4 knockdown.","method":"Co-immunoprecipitation (predicted by STRING/HDOCK, confirmed by immunofluorescence), siRNA knockdown, rescue overexpression, western blot for PI3K/AKT pathway, ferroptosis assays, in vivo xenograft","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — binding predicted computationally and supported by immunofluorescence co-localization; functional rescue confirms pathway; single lab","pmids":["40081544"],"is_preprint":false},{"year":2025,"finding":"GINS4 directly interacts with p65 NF-κB subunit and promotes phosphorylation and acetylation of p65, thereby driving NF-κB-mediated inflammatory cytokine production (IL-6, IL-1β, IL-18, IFN-γ, TNF-α) and BPD-like pathological changes in lung tissue.","method":"Co-immunoprecipitation (direct interaction with p65), western blot for phosphorylation/acetylation, in vivo neonatal rat model, histological analysis","journal":"Molecular biotechnology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct interaction by Co-IP and functional phenotype in vivo, single lab, single study","pmids":["41144169"],"is_preprint":false},{"year":2025,"finding":"α5-nAChR mediates nicotine-induced GINS4 expression via STAT3 signaling, linking nicotine receptor activation to GINS4-driven LUAD cell proliferation, migration, and invasion.","method":"siRNA knockdown (CHRNA5), western blot, in vitro proliferation/migration assays, xenograft model","journal":"Food and chemical toxicology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, knockdown with phenotype but pathway placement (STAT3) inferred without direct mechanistic reconstitution","pmids":["41192616"],"is_preprint":false},{"year":2026,"finding":"Sld5/GINS4 depletion in cancer cells disperses PCM1-, AZI1-, and CEP290-positive centriolar satellites, reduces dynein heavy chain expression, and destabilizes dynein-dynactin localization at spindle poles, impairing recruitment of PLK1, Aurora A, CEP192, and CEP215 to centrosomes and causing multipolar spindle formation. Direct dynein depletion or pharmacological inhibition (ciliobrevin D) phenocopies Sld5 loss, placing SLD5 upstream of dynein-dependent centrosome maturation. These defects occur without detectable DNA damage.","method":"siRNA knockdown, co-depletion epistasis, pharmacological inhibition (ciliobrevin D), immunofluorescence localization, western blot","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis via co-depletion and pharmacological phenocopy, direct localization experiments with functional consequence; preprint, not yet peer-reviewed","pmids":["42182163"],"is_preprint":true}],"current_model":"GINS4/SLD5 is a core subunit of the tetrameric GINS complex (with PSF1, PSF2, PSF3) that functions as part of the CMG (CDC45-MCM-GINS) replicative helicase to initiate and elongate DNA replication; beyond replication, GINS4 localizes to centrosomes where it maintains centriolar satellites and dynein-dependent centrosome maturation for spindle-pole integrity, recruits the kinase SIK1 to activate MCM2 via phosphorylation, directly binds and activates the GTPases Rac1 and CDC42 to promote cell growth and metastasis, destabilizes p53 by activating Snail-mediated antagonism of p53 acetylation at K351 to suppress ferroptosis, interacts with p65 NF-κB to promote its phosphorylation and acetylation, and is targeted by multiple RNA virus matrix proteins that hijack SLD5 to block host cell cycle progression."},"narrative":{"mechanistic_narrative":"GINS4/SLD5 is a core subunit of the heterotetrameric GINS complex, identified through its direct binding to PSF1/GINS1, and functions in the CMG replicative helicase to drive DNA replication and maintain genomic integrity [PMID:16338220, PMID:20709026]. Its replication role is essential in vivo: targeted disruption in mice abolishes inner cell mass proliferation and causes peri-implantation lethality [PMID:24244394], and in humans partial loss-of-function compound heterozygous mutations that impair GINS complex assembly delay cell cycle progression and produce a cell-intrinsic block in NK cell and neutrophil development [PMID:36345943]. At the mechanistic level of replication initiation, GINS4 recruits the kinase SIK1 to replication sites at S-phase onset, where SIK1 phosphorylates MCM2 at conserved N-terminal residues to activate the MCM helicase [PMID:27592030], and GINS4 also engages the DNA polymerase epsilon subunit POLE2 to sustain proliferation [PMID:40081544]. Beyond the replisome, GINS4 localizes to centrosomes and maintains clustering of centriolar satellites, supporting dynein-dependent recruitment of pericentrin, PLK1, Aurora A, and other maturation factors so that spindle poles resist microtubule-based traction forces; its loss disperses satellites and produces fragmented or multipolar spindle poles independently of DNA damage [PMID:29061732]. GINS4 additionally functions as a pro-tumorigenic and pro-inflammatory effector: it directly binds and activates the GTPases Rac1 and CDC42 to drive cancer cell growth and metastasis [PMID:31754397], destabilizes p53 via Snail-mediated antagonism of K351 acetylation to suppress ferroptosis [PMID:37018198], and binds the p65 NF-κB subunit to promote its phosphorylation and acetylation and downstream inflammatory cytokine production [PMID:41144169]. GINS4 is also a target hijacked by RNA virus matrix proteins (influenza M1, VSV, SeV, HIV) that exploit it to enforce host G0/G1 arrest, and GINS4 itself restrains viral replication and enhances type I interferon signaling [PMID:31050118, PMID:34882534].","teleology":[{"year":2005,"claim":"Established GINS4/SLD5 as a bona fide subunit of the mammalian GINS complex by defining its direct partner, answering whether the SLD5 ortholog physically integrates into the replication machinery.","evidence":"Yeast two-hybrid and immunofluorescence co-localization with PSF1/GINS1","pmids":["16338220"],"confidence":"Medium","gaps":["Interaction stoichiometry within the full GINS tetramer not resolved","No demonstration of replicative function from this binding alone"]},{"year":2010,"claim":"Tied SLD5 to GINS/CMG assembly and genomic stability in a multicellular organism, showing its loss perturbs cell cycle progression.","evidence":"Co-IP with Psf1, Psf2, Mcm10 plus genetic loss-of-function and cell cycle analysis in Drosophila","pmids":["20709026"],"confidence":"Medium","gaps":["Mechanistic step within helicase loading/activation not isolated","Drosophila phenotype not yet mapped to mammalian requirements"]},{"year":2013,"claim":"Demonstrated that SLD5 is essential for proliferation and embryogenesis in vivo, elevating it from a complex component to an organismally required gene.","evidence":"Mouse knockout with histological analysis showing peri-implantation lethality","pmids":["24244394"],"confidence":"High","gaps":["Tissue-specific requirements not dissected","Does not distinguish replication from non-replication functions in lethality"]},{"year":2014,"claim":"Revealed a protective role against DNA damage and a differential repair requirement between normal and cancer cells, hinting at therapeutic selectivity.","evidence":"siRNA knockdown with DNA damage and cell cycle assays across normal and cancer cells","pmids":["25334017"],"confidence":"Medium","gaps":["Molecular basis of the normal-vs-cancer repair difference unexplained","Single-lab observation"]},{"year":2016,"claim":"Defined a specific molecular function in replication initiation: GINS4 acts as a recruitment platform for a kinase that activates the MCM helicase.","evidence":"Co-IP, in vitro kinase assay defining five MCM2 phospho-sites, ChIP, and knockdown","pmids":["27592030"],"confidence":"High","gaps":["Structural basis of GINS4-SIK1 binding unknown","Whether SIK1 recruitment is conserved across cell types untested"]},{"year":2017,"claim":"Uncovered a replication-independent role at centrosomes, showing GINS4 maintains centriolar satellites and spindle-pole integrity against microtubule traction forces.","evidence":"siRNA knockdown, immunofluorescence, live-cell imaging, and HSET co-depletion epistasis","pmids":["29061732"],"confidence":"High","gaps":["Molecular mechanism linking GINS4 to satellite clustering not defined","Whether centrosomal pool is distinct from replisome pool unclear"]},{"year":2019,"claim":"Identified an oncogenic signaling output, showing GINS4 directly activates Rho-family GTPases to drive cancer growth and metastasis beyond its replication role.","evidence":"Co-IP, GST pull-down, and GTPase activation assays in gastric cancer cells","pmids":["31754397"],"confidence":"High","gaps":["How a replisome subunit accesses cytoplasmic GTPases not explained","Direct vs indirect GTPase activation mechanism not resolved"]},{"year":2019,"claim":"Placed GINS4 under post-transcriptional control, showing LSH stabilizes its mRNA to elevate protein levels in cancer.","evidence":"RNA immunoprecipitation, Co-IP, and rescue experiments in lung cancer","pmids":["31253190"],"confidence":"Medium","gaps":["Other regulators of GINS4 transcript stability unknown","Single-lab finding"]},{"year":2019,"claim":"Established GINS4 as a host target of viral matrix proteins, linking its replication function to virus-imposed cell cycle arrest and antiviral resistance.","evidence":"Yeast two-hybrid, Co-IP, cell cycle analysis, and SLD5 transgenic mouse rescue with influenza M1","pmids":["31050118"],"confidence":"High","gaps":["Region of GINS4 bound by M1 not mapped","Mechanism by which M1 binding blocks cycle progression unresolved"]},{"year":2021,"claim":"Generalized the viral-hijack model across multiple RNA viruses and showed GINS4 actively restrains viral replication while boosting interferon signaling.","evidence":"Co-IP, viral replication and interferon assays with VSV, SeV, HIV matrix proteins, in vitro and in vivo","pmids":["34882534"],"confidence":"Medium","gaps":["Mechanism connecting GINS4 to type I interferon induction not defined","Direct vs indirect suppression of viral replication unclear"]},{"year":2022,"claim":"Provided human-genetic validation that GINS4 assembly defects cause an immunodeficiency, tying replication competence to NK cell and neutrophil development.","evidence":"Exome sequencing of patients, GINS complex assembly assays, knockdown, and in vitro NK differentiation","pmids":["36345943"],"confidence":"High","gaps":["Why NK/neutrophil lineages are selectively vulnerable not explained","Replication-stress-independent mechanism of the developmental block unresolved"]},{"year":2023,"claim":"Linked GINS4 to ferroptosis resistance via a p53-destabilizing axis, defining a tumor-survival mechanism distinct from replication.","evidence":"CRISPR/Cas9 knockout, p53 K351 acetylation and mutagenesis assays, and ferroptosis assays in lung adenocarcinoma","pmids":["37018198"],"confidence":"High","gaps":["How GINS4 activates Snail not defined","Whether the centrosomal/replisome pool mediates this function unknown"]},{"year":2025,"claim":"Connected GINS4 to a proliferative kinase pathway through POLE2, coupling replication machinery to PI3K/AKT signaling and ferroptosis control.","evidence":"Computationally predicted interaction confirmed by immunofluorescence, knockdown, rescue, and xenograft in HCC","pmids":["40081544"],"confidence":"Medium","gaps":["Direct GINS4-POLE2 binding rests on prediction plus colocalization, not biochemical reconstitution","Mechanism linking POLE2 to PI3K/AKT not resolved"]},{"year":2025,"claim":"Extended GINS4 into inflammatory signaling, showing it engages p65 NF-κB to drive cytokine production and lung pathology.","evidence":"Co-IP with p65, phospho/acetylation western blots, and a neonatal rat BPD model","pmids":["41144169"],"confidence":"Medium","gaps":["Single study with single-lab support","How GINS4 promotes p65 modification mechanistically unknown"]},{"year":2025,"claim":"Identified an upstream inducer of GINS4 expression, linking nicotine receptor signaling to GINS4-driven tumor phenotypes.","evidence":"CHRNA5 knockdown, western blot, and proliferation/migration assays with xenograft in LUAD","pmids":["41192616"],"confidence":"Low","gaps":["STAT3 pathway placement inferred without direct mechanistic reconstitution","Single-lab, low-confidence finding"]},{"year":2026,"claim":"Refined the centrosomal mechanism by placing GINS4 upstream of dynein-dependent centrosome maturation independently of DNA damage.","evidence":"siRNA knockdown, co-depletion epistasis, ciliobrevin D pharmacological phenocopy, and immunofluorescence (preprint)","pmids":["42182163"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Molecular link between GINS4 and dynein heavy chain expression undefined"]},{"year":null,"claim":"It remains unresolved how a single core replisome subunit physically partitions among its distinct roles at the replication fork, centrosome, cytoplasmic GTPases, and transcription/inflammatory effectors.","evidence":"No reconstitution or pool-separation study in the corpus addresses how these functions are spatially or biochemically segregated","pmids":[],"confidence":"Low","gaps":["No structural model distinguishing replisome from moonlighting interactions","Whether moonlighting functions require GINS complex assembly untested","Mechanism of subcellular targeting between nucleus, centrosome, and cytoplasm unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,4]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,6]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[5,15]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[5,15]}],"pathway":[{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[0,1,4]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2,5,10]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,11]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[11,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,10,13]}],"complexes":["GINS complex","CMG helicase"],"partners":["PSF1","SIK1","RAC1","CDC42","POLE2","RELA","MCM10"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BRT9","full_name":"DNA replication complex GINS protein SLD5","aliases":["GINS complex subunit 4"],"length_aa":223,"mass_kda":26.0,"function":"Required for correct functioning of the GINS complex, a complex that plays an essential role in the initiation of DNA replication, and progression of DNA replication forks (PubMed:17417653, PubMed:28414293). GINS complex is a core component of CDC45-MCM-GINS (CMG) helicase, the molecular machine that unwinds template DNA during replication, and around which the replisome is built (PubMed:32453425, PubMed:34694004, PubMed:34700328, PubMed:35585232)","subcellular_location":"Nucleus; Chromosome; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9BRT9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/GINS4","classification":"Common Essential","n_dependent_lines":1186,"n_total_lines":1208,"dependency_fraction":0.9817880794701986},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GINS4","total_profiled":1310},"omim":[{"mim_id":"610611","title":"GINS COMPLEX SUBUNIT 4; GINS4","url":"https://www.omim.org/entry/610611"},{"mim_id":"610610","title":"GINS COMPLEX SUBUNIT 3; GINS3","url":"https://www.omim.org/entry/610610"},{"mim_id":"610609","title":"GINS COMPLEX SUBUNIT 2; GINS2","url":"https://www.omim.org/entry/610609"},{"mim_id":"610608","title":"GINS COMPLEX SUBUNIT 1; GINS1","url":"https://www.omim.org/entry/610608"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Centrosome","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":5.4},{"tissue":"lymphoid tissue","ntpm":5.7}],"url":"https://www.proteinatlas.org/search/GINS4"},"hgnc":{"alias_symbol":["MGC14799","SLD5"],"prev_symbol":[]},"alphafold":{"accession":"Q9BRT9","domains":[{"cath_id":"1.20.58.1030","chopping":"24-164","consensus_level":"high","plddt":95.6255,"start":24,"end":164},{"cath_id":"3.40.5.60","chopping":"167-223","consensus_level":"medium","plddt":93.6312,"start":167,"end":223}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BRT9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BRT9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BRT9-F1-predicted_aligned_error_v6.png","plddt_mean":90.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GINS4","jax_strain_url":"https://www.jax.org/strain/search?query=GINS4"},"sequence":{"accession":"Q9BRT9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BRT9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BRT9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BRT9"}},"corpus_meta":[{"pmid":"31754397","id":"PMC_31754397","title":"The novel GINS4 axis promotes gastric cancer growth and progression by activating Rac1 and CDC42.","date":"2019","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/31754397","citation_count":66,"is_preprint":false},{"pmid":"37018198","id":"PMC_37018198","title":"GINS4 suppresses ferroptosis by antagonizing p53 acetylation with Snail.","date":"2023","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/37018198","citation_count":47,"is_preprint":false},{"pmid":"31253190","id":"PMC_31253190","title":"LSH interacts with and stabilizes GINS4 transcript that promotes tumourigenesis in non-small cell lung cancer.","date":"2019","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/31253190","citation_count":44,"is_preprint":false},{"pmid":"36345943","id":"PMC_36345943","title":"Partial loss-of-function mutations in GINS4 lead to NK cell deficiency with neutropenia.","date":"2022","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/36345943","citation_count":20,"is_preprint":false},{"pmid":"20709026","id":"PMC_20709026","title":"Drosophila Sld5 is essential for normal cell cycle progression and maintenance of genomic integrity.","date":"2010","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/20709026","citation_count":19,"is_preprint":false},{"pmid":"27592030","id":"PMC_27592030","title":"GINS complex protein Sld5 recruits SIK1 to activate MCM helicase during DNA replication.","date":"2016","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/27592030","citation_count":17,"is_preprint":false},{"pmid":"24244394","id":"PMC_24244394","title":"Requirement of SLD5 for early embryogenesis.","date":"2013","source":"PloS 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Adenocarcinoma.","date":"2023","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/37508549","citation_count":10,"is_preprint":false},{"pmid":"29650228","id":"PMC_29650228","title":"Visualization of Proliferative Vascular Endothelial Cells in Tumors in Vivo by Imaging Their Partner of Sld5-1 Promoter Activity.","date":"2018","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/29650228","citation_count":8,"is_preprint":false},{"pmid":"36628810","id":"PMC_36628810","title":"Hsa_circ_0008673 Promotes Breast Cancer Progression by MiR-578/GINS4 Axis.","date":"2022","source":"Clinical breast cancer","url":"https://pubmed.ncbi.nlm.nih.gov/36628810","citation_count":7,"is_preprint":false},{"pmid":"29061732","id":"PMC_29061732","title":"Sld5 Ensures Centrosomal Resistance to Congression Forces by Preserving Centriolar Satellites.","date":"2017","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/29061732","citation_count":6,"is_preprint":false},{"pmid":"25334017","id":"PMC_25334017","title":"DNA damage enhanced by the attenuation of SLD5 delays cell cycle restoration in normal cells but not in cancer cells.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25334017","citation_count":6,"is_preprint":false},{"pmid":"40081544","id":"PMC_40081544","title":"GINS4 silencing mediates hepatocellular cancer cell proliferation, cycle and ferroptosis through POLE2.","date":"2025","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/40081544","citation_count":3,"is_preprint":false},{"pmid":"34882534","id":"PMC_34882534","title":"Multiple RNA virus matrix proteins interact with SLD5 to manipulate host cell cycle.","date":"2021","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/34882534","citation_count":3,"is_preprint":false},{"pmid":"36273455","id":"PMC_36273455","title":"MicroRNA-133a-3p Inhibits Lung Adenocarcinoma Development and Cisplatin Resistance through Targeting GINS4.","date":"2022","source":"Cells, tissues, organs","url":"https://pubmed.ncbi.nlm.nih.gov/36273455","citation_count":2,"is_preprint":false},{"pmid":"42182163","id":"PMC_42182163","title":"SLD5/GINS4 controls dynein-dependent centrosome maturation and exposes a candidate mitotic vulnerability in cancer.","date":"2026","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/42182163","citation_count":0,"is_preprint":false},{"pmid":"41192616","id":"PMC_41192616","title":"The α5-nAChR/GINS4 axis contributed to nicotine-promoted lung adenocarcinoma progression.","date":"2025","source":"Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association","url":"https://pubmed.ncbi.nlm.nih.gov/41192616","citation_count":0,"is_preprint":false},{"pmid":"41144169","id":"PMC_41144169","title":"GINS4 Promotes Neonatal Bronchopulmonary Dysplasia via Driving Phosphorylation and Acetylation of p65 NF-κB.","date":"2025","source":"Molecular biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/41144169","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":11411,"output_tokens":3903,"usd":0.046389,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11713,"output_tokens":4843,"usd":0.08982,"stage2_stop_reason":"end_turn"},"total_usd":0.136209,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"GINS4/SLD5 was identified as a direct binding partner of PSF1 (GINS1), interacting with a central region of PSF1, and co-localizes with PSF1 when overexpressed, establishing SLD5 as a component of the mammalian GINS complex.\",\n      \"method\": \"Yeast two-hybrid, co-localization by immunofluorescence\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid and co-localization, single lab, two orthogonal methods\",\n      \"pmids\": [\"16338220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Drosophila Sld5 (ortholog of GINS4) interacts with Psf1, Psf2, and Mcm10 within the GINS/CMG complex, and loss-of-function mutations in Sld5 cause M and S phase delays with chromosomal instability, establishing its essential role in DNA replication and genomic integrity in a multicellular organism.\",\n      \"method\": \"Co-immunoprecipitation, genetic loss-of-function (mutant analysis), cell cycle analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and genetic phenotype, single lab, two orthogonal methods\",\n      \"pmids\": [\"20709026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Targeted disruption of SLD5 in mice causes defective cell proliferation in the inner cell mass and embryonic lethality at the peri-implantation stage, demonstrating SLD5 is essential for early embryogenesis and cell proliferation in vivo.\",\n      \"method\": \"Gene knockout in mice, histological analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined cellular phenotype (embryonic lethality), replicated observation consistent with PSF1 knockout phenotype\",\n      \"pmids\": [\"24244394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Attenuation of SLD5 expression induces DNA damage in both normal and cancer cells; however, delay in DNA repair response and cell cycle restoration following SLD5 knockdown occurs in normal cells but NOT in cancer cells, indicating SLD5 protects against DNA damage and is differentially required for repair in normal vs. cancer cells.\",\n      \"method\": \"siRNA knockdown, DNA damage assays, cell cycle analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown with defined cellular phenotype, single lab, multiple cell types tested\",\n      \"pmids\": [\"25334017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GINS4/Sld5 directly interacts with SIK1 (salt-inducible kinase 1) and recruits SIK1 to sites of DNA replication at the onset of S phase; SIK1 then phosphorylates MCM2 at five conserved N-terminal residues, which is essential for MCM helicase activation during DNA replication.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, siRNA knockdown, chromatin immunoprecipitation\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with defined phosphorylation sites, Co-IP, and functional knockdown; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"27592030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sld5/GINS4 localizes to centrosomes and is required to maintain centriolar satellites clustered around centrosomes; depletion of Sld5 disperses centriolar satellites throughout the cytoplasm, impairs recruitment of pericentrin to centrosomes, and renders centrosomes unable to resist CENP-E- and Kid-mediated microtubular forces during chromosome congression, leading to monocentriolar and acentriolar spindle poles. HSET (kinesin-14) sustains the traction forces mediating centrosomal fragmentation in Sld5-depleted cells.\",\n      \"method\": \"siRNA knockdown, immunofluorescence/localization, live-cell imaging, genetic epistasis (co-depletion)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments with functional consequences, epistasis analysis, multiple orthogonal methods in single study\",\n      \"pmids\": [\"29061732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GINS4 directly binds to Rac1 and CDC42 (demonstrated by Co-IP and GST pull-down), activating these GTPases and their downstream pathways, thereby promoting gastric cancer cell growth and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, GTPase activation assays, cDNA array\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding confirmed by GST pull-down and Co-IP, GTPase activity assay, single lab but three orthogonal methods\",\n      \"pmids\": [\"31754397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LSH (lymphoid-specific helicase) binds to the 3'UTR region of GINS4 mRNA and stabilizes its transcript levels (demonstrated by Co-IP and RNA immunoprecipitation), thereby increasing GINS4 protein expression and promoting lung cancer progression.\",\n      \"method\": \"Co-immunoprecipitation, RNA immunoprecipitation (RIP), western blot, rescue experiments\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and Co-IP with functional rescue, single lab, two orthogonal methods\",\n      \"pmids\": [\"31253190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Influenza virus matrix protein M1 directly interacts with SLD5/GINS4 (identified by yeast two-hybrid, confirmed in mammalian cells); this interaction mediates M1-induced host cell cycle blockade at G0/G1 phase. Overexpression of SLD5 partially rescues M1-induced G0/G1 arrest, and SLD5 transgenic mice show higher resistance to influenza infection.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, cell cycle analysis, transgenic mouse model, rescue experiments\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including yeast two-hybrid, Co-IP, in vivo transgenic rescue, single lab\",\n      \"pmids\": [\"31050118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Matrix proteins of multiple RNA viruses (VSV, SeV, HIV) interact with SLD5/GINS4 and induce G0/G1 cell cycle arrest; overexpression of SLD5 partially rescues this arrest and SLD5 suppresses VSV replication in vitro and in vivo while enhancing type I interferon signaling.\",\n      \"method\": \"Co-immunoprecipitation, cell cycle analysis, viral replication assays, in vivo experiments, interferon signaling assays\",\n      \"journal\": \"The Journal of general virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional rescue, single lab, consistent with prior M1/SLD5 study\",\n      \"pmids\": [\"34882534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Partial loss-of-function compound heterozygous mutations in GINS4 impair expression and assembly of the GINS complex, causing delayed cell cycle progression without increased replication stress. GINS4 knockdown in differentiating NK cells in vitro demonstrates a cell-intrinsic defect in NK cell development, establishing GINS4 as necessary for NK cell and neutrophil development.\",\n      \"method\": \"Exome sequencing, patient-derived cell analysis, GINS4 knockdown, cell cycle analysis, in vitro NK cell differentiation assay\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetics combined with functional knockdown in primary cells and in vitro differentiation model, multiple orthogonal approaches\",\n      \"pmids\": [\"36345943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GINS4 suppresses p53 stability by activating Snail, which antagonizes acetylation of p53 at lysine residue K351; this destabilization of p53 inhibits ferroptosis. CRISPR/Cas9-mediated GINS4 knockout facilitates ferroptosis in lung adenocarcinoma cells, particularly in G2/M cells.\",\n      \"method\": \"CRISPR/Cas9 knockout, ferroptosis assays, Co-immunoprecipitation, p53 acetylation assays, site-directed mutagenesis (K351)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — CRISPR KO, mutagenesis of specific residue (K351), Co-IP, and functional ferroptosis assay; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37018198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GINS4 directly interacts with POLE2 (DNA polymerase epsilon subunit 2); GINS4 silencing inhibits POLE2 expression, leading to suppression of PI3K/AKT signaling, reduced HCC cell proliferation and cell cycle progression, and promotion of ferroptosis. POLE2 overexpression reverses the effects of GINS4 knockdown.\",\n      \"method\": \"Co-immunoprecipitation (predicted by STRING/HDOCK, confirmed by immunofluorescence), siRNA knockdown, rescue overexpression, western blot for PI3K/AKT pathway, ferroptosis assays, in vivo xenograft\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — binding predicted computationally and supported by immunofluorescence co-localization; functional rescue confirms pathway; single lab\",\n      \"pmids\": [\"40081544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GINS4 directly interacts with p65 NF-κB subunit and promotes phosphorylation and acetylation of p65, thereby driving NF-κB-mediated inflammatory cytokine production (IL-6, IL-1β, IL-18, IFN-γ, TNF-α) and BPD-like pathological changes in lung tissue.\",\n      \"method\": \"Co-immunoprecipitation (direct interaction with p65), western blot for phosphorylation/acetylation, in vivo neonatal rat model, histological analysis\",\n      \"journal\": \"Molecular biotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct interaction by Co-IP and functional phenotype in vivo, single lab, single study\",\n      \"pmids\": [\"41144169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"α5-nAChR mediates nicotine-induced GINS4 expression via STAT3 signaling, linking nicotine receptor activation to GINS4-driven LUAD cell proliferation, migration, and invasion.\",\n      \"method\": \"siRNA knockdown (CHRNA5), western blot, in vitro proliferation/migration assays, xenograft model\",\n      \"journal\": \"Food and chemical toxicology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, knockdown with phenotype but pathway placement (STAT3) inferred without direct mechanistic reconstitution\",\n      \"pmids\": [\"41192616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Sld5/GINS4 depletion in cancer cells disperses PCM1-, AZI1-, and CEP290-positive centriolar satellites, reduces dynein heavy chain expression, and destabilizes dynein-dynactin localization at spindle poles, impairing recruitment of PLK1, Aurora A, CEP192, and CEP215 to centrosomes and causing multipolar spindle formation. Direct dynein depletion or pharmacological inhibition (ciliobrevin D) phenocopies Sld5 loss, placing SLD5 upstream of dynein-dependent centrosome maturation. These defects occur without detectable DNA damage.\",\n      \"method\": \"siRNA knockdown, co-depletion epistasis, pharmacological inhibition (ciliobrevin D), immunofluorescence localization, western blot\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis via co-depletion and pharmacological phenocopy, direct localization experiments with functional consequence; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"42182163\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"GINS4/SLD5 is a core subunit of the tetrameric GINS complex (with PSF1, PSF2, PSF3) that functions as part of the CMG (CDC45-MCM-GINS) replicative helicase to initiate and elongate DNA replication; beyond replication, GINS4 localizes to centrosomes where it maintains centriolar satellites and dynein-dependent centrosome maturation for spindle-pole integrity, recruits the kinase SIK1 to activate MCM2 via phosphorylation, directly binds and activates the GTPases Rac1 and CDC42 to promote cell growth and metastasis, destabilizes p53 by activating Snail-mediated antagonism of p53 acetylation at K351 to suppress ferroptosis, interacts with p65 NF-κB to promote its phosphorylation and acetylation, and is targeted by multiple RNA virus matrix proteins that hijack SLD5 to block host cell cycle progression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GINS4/SLD5 is a core subunit of the heterotetrameric GINS complex, identified through its direct binding to PSF1/GINS1, and functions in the CMG replicative helicase to drive DNA replication and maintain genomic integrity [#0, #1]. Its replication role is essential in vivo: targeted disruption in mice abolishes inner cell mass proliferation and causes peri-implantation lethality [#2], and in humans partial loss-of-function compound heterozygous mutations that impair GINS complex assembly delay cell cycle progression and produce a cell-intrinsic block in NK cell and neutrophil development [#10]. At the mechanistic level of replication initiation, GINS4 recruits the kinase SIK1 to replication sites at S-phase onset, where SIK1 phosphorylates MCM2 at conserved N-terminal residues to activate the MCM helicase [#4], and GINS4 also engages the DNA polymerase epsilon subunit POLE2 to sustain proliferation [#12]. Beyond the replisome, GINS4 localizes to centrosomes and maintains clustering of centriolar satellites, supporting dynein-dependent recruitment of pericentrin, PLK1, Aurora A, and other maturation factors so that spindle poles resist microtubule-based traction forces; its loss disperses satellites and produces fragmented or multipolar spindle poles independently of DNA damage [#5]. GINS4 additionally functions as a pro-tumorigenic and pro-inflammatory effector: it directly binds and activates the GTPases Rac1 and CDC42 to drive cancer cell growth and metastasis [#6], destabilizes p53 via Snail-mediated antagonism of K351 acetylation to suppress ferroptosis [#11], and binds the p65 NF-\\u03baB subunit to promote its phosphorylation and acetylation and downstream inflammatory cytokine production [#13]. GINS4 is also a target hijacked by RNA virus matrix proteins (influenza M1, VSV, SeV, HIV) that exploit it to enforce host G0/G1 arrest, and GINS4 itself restrains viral replication and enhances type I interferon signaling [#8, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established GINS4/SLD5 as a bona fide subunit of the mammalian GINS complex by defining its direct partner, answering whether the SLD5 ortholog physically integrates into the replication machinery.\",\n      \"evidence\": \"Yeast two-hybrid and immunofluorescence co-localization with PSF1/GINS1\",\n      \"pmids\": [\"16338220\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interaction stoichiometry within the full GINS tetramer not resolved\", \"No demonstration of replicative function from this binding alone\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Tied SLD5 to GINS/CMG assembly and genomic stability in a multicellular organism, showing its loss perturbs cell cycle progression.\",\n      \"evidence\": \"Co-IP with Psf1, Psf2, Mcm10 plus genetic loss-of-function and cell cycle analysis in Drosophila\",\n      \"pmids\": [\"20709026\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic step within helicase loading/activation not isolated\", \"Drosophila phenotype not yet mapped to mammalian requirements\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that SLD5 is essential for proliferation and embryogenesis in vivo, elevating it from a complex component to an organismally required gene.\",\n      \"evidence\": \"Mouse knockout with histological analysis showing peri-implantation lethality\",\n      \"pmids\": [\"24244394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific requirements not dissected\", \"Does not distinguish replication from non-replication functions in lethality\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed a protective role against DNA damage and a differential repair requirement between normal and cancer cells, hinting at therapeutic selectivity.\",\n      \"evidence\": \"siRNA knockdown with DNA damage and cell cycle assays across normal and cancer cells\",\n      \"pmids\": [\"25334017\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the normal-vs-cancer repair difference unexplained\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a specific molecular function in replication initiation: GINS4 acts as a recruitment platform for a kinase that activates the MCM helicase.\",\n      \"evidence\": \"Co-IP, in vitro kinase assay defining five MCM2 phospho-sites, ChIP, and knockdown\",\n      \"pmids\": [\"27592030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of GINS4-SIK1 binding unknown\", \"Whether SIK1 recruitment is conserved across cell types untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Uncovered a replication-independent role at centrosomes, showing GINS4 maintains centriolar satellites and spindle-pole integrity against microtubule traction forces.\",\n      \"evidence\": \"siRNA knockdown, immunofluorescence, live-cell imaging, and HSET co-depletion epistasis\",\n      \"pmids\": [\"29061732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking GINS4 to satellite clustering not defined\", \"Whether centrosomal pool is distinct from replisome pool unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified an oncogenic signaling output, showing GINS4 directly activates Rho-family GTPases to drive cancer growth and metastasis beyond its replication role.\",\n      \"evidence\": \"Co-IP, GST pull-down, and GTPase activation assays in gastric cancer cells\",\n      \"pmids\": [\"31754397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a replisome subunit accesses cytoplasmic GTPases not explained\", \"Direct vs indirect GTPase activation mechanism not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed GINS4 under post-transcriptional control, showing LSH stabilizes its mRNA to elevate protein levels in cancer.\",\n      \"evidence\": \"RNA immunoprecipitation, Co-IP, and rescue experiments in lung cancer\",\n      \"pmids\": [\"31253190\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Other regulators of GINS4 transcript stability unknown\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established GINS4 as a host target of viral matrix proteins, linking its replication function to virus-imposed cell cycle arrest and antiviral resistance.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, cell cycle analysis, and SLD5 transgenic mouse rescue with influenza M1\",\n      \"pmids\": [\"31050118\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Region of GINS4 bound by M1 not mapped\", \"Mechanism by which M1 binding blocks cycle progression unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Generalized the viral-hijack model across multiple RNA viruses and showed GINS4 actively restrains viral replication while boosting interferon signaling.\",\n      \"evidence\": \"Co-IP, viral replication and interferon assays with VSV, SeV, HIV matrix proteins, in vitro and in vivo\",\n      \"pmids\": [\"34882534\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting GINS4 to type I interferon induction not defined\", \"Direct vs indirect suppression of viral replication unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided human-genetic validation that GINS4 assembly defects cause an immunodeficiency, tying replication competence to NK cell and neutrophil development.\",\n      \"evidence\": \"Exome sequencing of patients, GINS complex assembly assays, knockdown, and in vitro NK differentiation\",\n      \"pmids\": [\"36345943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why NK/neutrophil lineages are selectively vulnerable not explained\", \"Replication-stress-independent mechanism of the developmental block unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked GINS4 to ferroptosis resistance via a p53-destabilizing axis, defining a tumor-survival mechanism distinct from replication.\",\n      \"evidence\": \"CRISPR/Cas9 knockout, p53 K351 acetylation and mutagenesis assays, and ferroptosis assays in lung adenocarcinoma\",\n      \"pmids\": [\"37018198\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GINS4 activates Snail not defined\", \"Whether the centrosomal/replisome pool mediates this function unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected GINS4 to a proliferative kinase pathway through POLE2, coupling replication machinery to PI3K/AKT signaling and ferroptosis control.\",\n      \"evidence\": \"Computationally predicted interaction confirmed by immunofluorescence, knockdown, rescue, and xenograft in HCC\",\n      \"pmids\": [\"40081544\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GINS4-POLE2 binding rests on prediction plus colocalization, not biochemical reconstitution\", \"Mechanism linking POLE2 to PI3K/AKT not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended GINS4 into inflammatory signaling, showing it engages p65 NF-\\u03baB to drive cytokine production and lung pathology.\",\n      \"evidence\": \"Co-IP with p65, phospho/acetylation western blots, and a neonatal rat BPD model\",\n      \"pmids\": [\"41144169\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single study with single-lab support\", \"How GINS4 promotes p65 modification mechanistically unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified an upstream inducer of GINS4 expression, linking nicotine receptor signaling to GINS4-driven tumor phenotypes.\",\n      \"evidence\": \"CHRNA5 knockdown, western blot, and proliferation/migration assays with xenograft in LUAD\",\n      \"pmids\": [\"41192616\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"STAT3 pathway placement inferred without direct mechanistic reconstitution\", \"Single-lab, low-confidence finding\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Refined the centrosomal mechanism by placing GINS4 upstream of dynein-dependent centrosome maturation independently of DNA damage.\",\n      \"evidence\": \"siRNA knockdown, co-depletion epistasis, ciliobrevin D pharmacological phenocopy, and immunofluorescence (preprint)\",\n      \"pmids\": [\"42182163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Molecular link between GINS4 and dynein heavy chain expression undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single core replisome subunit physically partitions among its distinct roles at the replication fork, centrosome, cytoplasmic GTPases, and transcription/inflammatory effectors.\",\n      \"evidence\": \"No reconstitution or pool-separation study in the corpus addresses how these functions are spatially or biochemically segregated\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model distinguishing replisome from moonlighting interactions\", \"Whether moonlighting functions require GINS complex assembly untested\", \"Mechanism of subcellular targeting between nucleus, centrosome, and cytoplasm unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 4]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [5, 15]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [5, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2, 5, 10]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 11]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 10, 13]}\n    ],\n    \"complexes\": [\n      \"GINS complex\",\n      \"CMG helicase\"\n    ],\n    \"partners\": [\n      \"PSF1\",\n      \"SIK1\",\n      \"RAC1\",\n      \"CDC42\",\n      \"POLE2\",\n      \"RELA\",\n      \"MCM10\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}