{"gene":"GINS4","run_date":"2026-04-28T18:06:52","timeline":{"discoveries":[{"year":2005,"finding":"GINS4 (SLD5) was identified as a PSF1-binding protein via yeast two-hybrid; SLD5 interacts with the central region of PSF1 and co-localizes with PSF1 when overexpressed, suggesting cooperation in immature cell proliferation.","method":"Yeast two-hybrid, co-localization by immunofluorescence","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, yeast two-hybrid plus co-localization, no functional mutagenesis","pmids":["16338220"],"is_preprint":false},{"year":2010,"finding":"Drosophila Sld5 (GINS4 ortholog) interacts with Psf1, Psf2, and Mcm10; mutations in Sld5 cause M and S phase delays with chromosomal instability, establishing its role in the CMG helicase complex and genomic integrity.","method":"Co-immunoprecipitation, genetic loss-of-function in Drosophila with cell cycle and cytological readouts","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus genetic phenotype in multicellular organism, single lab","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 peri-implantation stage, demonstrating SLD5 is essential for early embryogenesis and cell proliferation.","method":"Gene knockout in mice with histological and proliferation readouts","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined embryonic phenotype in mouse model","pmids":["24244394"],"is_preprint":false},{"year":2014,"finding":"Attenuation of SLD5 expression causes marked DNA damage in both normal and cancer cells, and delays DNA repair and cell cycle restoration specifically in normal cells but not in cancer cells, indicating SLD5 has a protective role against DNA damage beyond its DNA replication function.","method":"siRNA knockdown with DNA damage assays (γH2AX), cell cycle analysis, comet assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined cellular phenotype, single lab","pmids":["25334017"],"is_preprint":false},{"year":2016,"finding":"GINS4 (Sld5) recruits SIK1 (salt-inducible kinase 1) to replication sites at the onset of S phase by direct interaction; SIK1 then phosphorylates MCM2 at five conserved N-terminal residues, which is essential for MCM helicase activation.","method":"Co-immunoprecipitation, chromatin fractionation, in vitro kinase assay, site-directed mutagenesis, siRNA depletion","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro kinase assay with mutagenesis plus Co-IP and functional depletion, multiple orthogonal methods","pmids":["27592030"],"is_preprint":false},{"year":2017,"finding":"Sld5 localizes to centrosomes and is required for maintaining centriolar satellites clustered around centrosomes; depletion of Sld5 disperses satellites, prevents pericentrin recruitment, and renders centrosomes unable to resist CENP-E- and Kid-mediated microtubular pulling forces, causing monocentriolar and acentriolar spindle poles during chromosome congression.","method":"Immunofluorescence localization, siRNA knockdown, live imaging, epistasis with CENP-E/Kid/HSET inhibition","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean KD with defined mitotic phenotype plus epistasis with motor proteins, multiple orthogonal methods","pmids":["29061732"],"is_preprint":false},{"year":2019,"finding":"GINS4 directly binds Rac1 and CDC42 (demonstrated by co-IP and GST pull-down), activating their GTPase activity and downstream pathways, thereby promoting gastric cancer cell growth and metastasis.","method":"Co-immunoprecipitation, GST pull-down, GTPase activation assays, cDNA array, in vitro and in vivo functional assays","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding by GST pull-down plus GTPase activation assay plus functional rescue, multiple orthogonal methods","pmids":["31754397"],"is_preprint":false},{"year":2019,"finding":"LSH (lymphoid-specific helicase) binds to the 3'UTR of GINS4 mRNA and stabilizes it, increasing GINS4 expression at the post-transcriptional level in non-small cell lung cancer.","method":"RNA immunoprecipitation, Co-immunoprecipitation, overexpression/knockdown rescue experiments","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — RIP and Co-IP with rescue experiments, single lab","pmids":["31253190"],"is_preprint":false},{"year":2019,"finding":"Influenza virus M1 protein interacts with SLD5 and blocks host cell cycle at G0/G1; overexpression of SLD5 partially rescues M1-induced G0/G1 arrest, demonstrating SLD5 is a target of viral cell cycle manipulation.","method":"Yeast two-hybrid, co-immunoprecipitation, cell cycle analysis by flow cytometry, SLD5 transgenic mouse infection model","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 — yeast two-hybrid plus Co-IP plus cell cycle rescue plus in vivo transgenic model, single lab","pmids":["31050118"],"is_preprint":false},{"year":2021,"finding":"Matrix proteins of VSV, SeV, and HIV also interact with SLD5 and induce G0/G1 cell cycle arrest; SLD5 overexpression partially rescues VSV/SeV-induced arrest and suppresses VSV replication while enhancing type I interferon signaling, indicating targeting SLD5 is a common viral strategy.","method":"Co-immunoprecipitation, cell cycle analysis, viral replication assays, interferon signaling measurement","journal":"The Journal of general virology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus functional cell cycle rescue plus antiviral assays, single lab","pmids":["34882534"],"is_preprint":false},{"year":2022,"finding":"Partial loss-of-function biallelic mutations in GINS4 impair GINS complex assembly and expression, causing delayed cell cycle progression and a cell-intrinsic defect in NK cell development without increased replication stress, defining GINS4 as necessary for NK cell differentiation.","method":"Exome sequencing, GINS4 knockdown, GINS complex assembly assay (Co-IP/western blot), in vitro NK cell differentiation, cell cycle analysis","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 — human disease variants plus functional KD with complex assembly assay and in vitro NK differentiation rescue, multiple orthogonal methods","pmids":["36345943"],"is_preprint":false},{"year":2023,"finding":"GINS4 suppresses p53 stability by activating Snail, which antagonizes p53 acetylation; p53 lysine residue K351 is the key acetylation site through which GINS4 inhibits p53-mediated ferroptosis, particularly in G2/M cells.","method":"CRISPR/Cas9 KO, ferroptosis assays, western blot for p53 acetylation, site-directed mutagenesis of p53 K351, cell cycle analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — CRISPR KO with mutagenesis of key residue and mechanistic pathway dissection, multiple orthogonal methods","pmids":["37018198"],"is_preprint":false},{"year":2025,"finding":"GINS4 directly binds POLE2 (DNA polymerase epsilon subunit 2); GINS4 silencing reduces POLE2 expression and suppresses PI3K/AKT signaling, while POLE2 overexpression reverses the effects of GINS4 knockdown on proliferation, cell cycle, and ferroptosis in hepatocellular carcinoma cells.","method":"STRING/HDOCK binding prediction, Co-immunoprecipitation/co-localization, GINS4 knockdown, POLE2 overexpression rescue, in vivo xenograft","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 3 — binding predicted computationally and partially validated, rescue experiment supports pathway placement, single lab","pmids":["40081544"],"is_preprint":false},{"year":2025,"finding":"GINS4 directly interacts with p65 NF-κB and promotes its phosphorylation and acetylation, driving inflammatory cytokine expression (IL-6, IL-1β, IL-18, IFN-γ, TNF-α) in hyperoxia-induced lung injury.","method":"Co-immunoprecipitation, western blot for p65 phosphorylation/acetylation, in vivo neonatal rat BPD model","journal":"Molecular biotechnology","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP showing direct interaction with PTM readout, single lab, in vivo corroboration","pmids":["41144169"],"is_preprint":false},{"year":2025,"finding":"α5-nAChR (encoded by CHRNA5) mediates nicotine-induced GINS4 expression via STAT3 signaling, promoting LUAD cell proliferation, migration, and invasion; CHRNA5 silencing reduces GINS4 expression.","method":"siRNA knockdown, western blot, in vitro functional assays, xenograft models","journal":"Food and chemical toxicology","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined pathway (STAT3→GINS4) and functional readouts, validated in vivo, single lab","pmids":["41192616"],"is_preprint":false}],"current_model":"GINS4 (SLD5) is a core subunit of the tetrameric GINS complex that forms the CMG (CDC45-MCM2-7-GINS) replicative helicase required for DNA replication initiation and elongation; beyond replication, GINS4 localizes to centrosomes to maintain centriolar satellite integrity and spindle pole resistance, recruits SIK1 kinase to phosphorylate MCM2 for helicase activation, directly binds and activates Rac1/CDC42 GTPases to promote cell migration, suppresses p53-mediated ferroptosis by activating Snail-dependent antagonism of p53 acetylation at K351, interacts with p65 NF-κB to promote its phosphorylation and acetylation, and is subject to post-transcriptional stabilization by LSH binding to its 3'UTR and upstream regulation by multiple miRNAs and circRNA sponges."},"narrative":{"teleology":[{"year":2005,"claim":"Identification of GINS4 as a PSF1-interacting partner established it as a candidate GINS complex subunit involved in proliferating cell populations.","evidence":"Yeast two-hybrid screen and co-localization by immunofluorescence in human cells","pmids":["16338220"],"confidence":"Medium","gaps":["Interaction mapped only by yeast two-hybrid without endogenous Co-IP","Functional consequence of the interaction not tested","No evidence yet for role in DNA replication per se"]},{"year":2010,"claim":"Genetic loss-of-function of the Drosophila GINS4 ortholog demonstrated that it is required for normal S and M phase progression and chromosomal stability, anchoring it functionally within the CMG helicase complex.","evidence":"Co-immunoprecipitation with Psf1/Psf2/Mcm10 and mutant cytological analysis in Drosophila","pmids":["20709026"],"confidence":"Medium","gaps":["Phenotype described in Drosophila only; mammalian validation pending","Direct contribution to helicase enzymatic activity not tested"]},{"year":2013,"claim":"Mouse knockout established that GINS4 is indispensable for mammalian cell proliferation and embryonic viability, confirming its non-redundant role in vivo.","evidence":"Targeted gene disruption in mice; peri-implantation lethality with inner cell mass proliferation defect","pmids":["24244394"],"confidence":"High","gaps":["Molecular mechanism of lethality (replication vs. other functions) not dissected","Conditional knockout in specific tissues not performed"]},{"year":2014,"claim":"Knockdown experiments revealed that GINS4 protects normal cells from DNA damage and facilitates DNA repair, extending its function beyond replication fork progression.","evidence":"siRNA knockdown with γH2AX foci, comet assay, and cell cycle analysis in normal vs. cancer cells","pmids":["25334017"],"confidence":"Medium","gaps":["Mechanism linking GINS4 to DNA repair pathway not identified","Differential response between normal and cancer cells unexplained at the molecular level"]},{"year":2016,"claim":"Discovery that GINS4 recruits SIK1 kinase to chromatin at S-phase onset to phosphorylate MCM2 provided a direct mechanism for how GINS4 participates in replicative helicase activation.","evidence":"Co-immunoprecipitation, chromatin fractionation, in vitro kinase assay with site-directed mutagenesis, siRNA depletion","pmids":["27592030"],"confidence":"High","gaps":["Whether SIK1 recruitment is the sole mechanism of GINS4-dependent MCM activation is unknown","Structural basis of the GINS4–SIK1 interaction not resolved"]},{"year":2017,"claim":"Localization of GINS4 to centrosomes and its requirement for centriolar satellite clustering revealed a replication-independent mitotic function in maintaining spindle pole integrity.","evidence":"Immunofluorescence, siRNA knockdown, live imaging, epistasis with CENP-E/Kid/HSET inhibition in human cells","pmids":["29061732"],"confidence":"High","gaps":["How GINS4 is targeted to centrosomes is unknown","Whether centrosomal and replication functions are coordinately regulated is untested"]},{"year":2019,"claim":"Direct binding and activation of Rac1 and CDC42 GTPases by GINS4 established a non-replicative signaling role in cell migration and metastasis.","evidence":"GST pull-down, GTPase activation assays, cDNA array, in vitro and in vivo gastric cancer functional assays","pmids":["31754397"],"confidence":"High","gaps":["Structural determinants of GINS4–Rac1/CDC42 interaction unknown","Whether GTPase activation occurs through GEF-like activity or displacement of GDI not determined"]},{"year":2019,"claim":"Identification of GINS4 as a common target of viral matrix proteins (influenza M1, and later VSV/SeV/HIV) that exploit it to induce G0/G1 arrest revealed GINS4 as a node in host–virus cell cycle regulation.","evidence":"Yeast two-hybrid, Co-IP, cell cycle rescue by SLD5 overexpression, transgenic mouse infection model; extended to multiple viruses in 2021","pmids":["31050118","34882534"],"confidence":"Medium","gaps":["Mechanism by which viral matrix protein binding to GINS4 triggers G0/G1 arrest not defined","Whether the interaction surface overlaps with GINS complex assembly is unknown","Findings from a single laboratory; independent replication pending"]},{"year":2022,"claim":"Human biallelic GINS4 mutations causing impaired GINS complex assembly and selective NK cell developmental failure defined GINS4 as a Mendelian immunodeficiency gene and demonstrated lineage-specific sensitivity to partial GINS loss.","evidence":"Exome sequencing, GINS4 knockdown, GINS complex assembly Co-IP, in vitro NK cell differentiation assay","pmids":["36345943"],"confidence":"High","gaps":["Why NK cells are selectively affected among immune lineages is unclear","Whether residual GINS4 function supports replication adequately in other lineages not tested in patients"]},{"year":2023,"claim":"GINS4 was shown to suppress p53-mediated ferroptosis via a Snail–p53-K351 acetylation axis, revealing a cell-death regulatory function particularly active in G2/M phase.","evidence":"CRISPR/Cas9 knockout, ferroptosis assays, p53-K351 site-directed mutagenesis, cell cycle fractionation","pmids":["37018198"],"confidence":"High","gaps":["How GINS4 activates Snail transcription or stability is not defined","Whether this ferroptosis-suppressive function operates independently of the GINS replication complex is unclear"]},{"year":2025,"claim":"GINS4 was found to interact with POLE2 and p65 NF-κB, linking it to PI3K/AKT signaling in hepatocellular carcinoma and to NF-κB-driven inflammatory cytokine expression in lung injury, respectively.","evidence":"Co-immunoprecipitation, knockdown/overexpression rescue, xenograft models (POLE2); Co-IP with p65 phosphorylation/acetylation readouts in neonatal rat BPD model (NF-κB)","pmids":["40081544","41144169"],"confidence":"Medium","gaps":["POLE2 binding predicted computationally and validated by single-lab Co-IP only","Mechanism by which GINS4 promotes p65 post-translational modifications not identified","Independence of these signaling roles from GINS complex context not established"]},{"year":null,"claim":"How GINS4's replication-dependent and replication-independent functions (centrosome maintenance, GTPase activation, ferroptosis suppression, NF-κB signaling) are structurally partitioned and coordinately regulated remains an open question.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model distinguishing GINS-complex-bound vs. free GINS4 interaction surfaces","No temporal or spatial separation of replication vs. non-replication functions resolved in single cells","Lineage-specific essentiality mechanisms (e.g., NK cells) lack molecular explanation"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,6,11,13]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,5]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,5]}],"pathway":[{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[1,2,4,10]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,3,5,8,9]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,13]}],"complexes":["GINS complex","CMG helicase (CDC45-MCM2-7-GINS)"],"partners":["PSF1","SIK1","MCM2","RAC1","CDC42","RELA","POLE2","SNAI1"],"other_free_text":[]},"mechanistic_narrative":"GINS4 (SLD5) is a core subunit of the tetrameric GINS complex essential for DNA replication, centrosome integrity, cell cycle progression, and suppression of ferroptosis. As a GINS subunit, it participates in CMG helicase assembly and activation—recruiting SIK1 kinase to phosphorylate MCM2 for helicase firing [PMID:27592030]—and its disruption causes embryonic lethality, DNA damage accumulation, and impaired GINS complex assembly that selectively blocks NK cell differentiation [PMID:24244394, PMID:25334017, PMID:36345943]. Beyond replication, GINS4 localizes to centrosomes where it maintains centriolar satellite clustering and spindle pole integrity during mitosis [PMID:29061732], directly binds and activates Rac1/CDC42 GTPases to promote cell migration [PMID:31754397], and suppresses p53-mediated ferroptosis by activating Snail to antagonize p53 acetylation at K351 [PMID:37018198]. Biallelic partial loss-of-function mutations in GINS4 cause a human immunodeficiency characterized by defective NK cell development [PMID:36345943]."},"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":46,"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":"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":"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":18,"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 one","url":"https://pubmed.ncbi.nlm.nih.gov/24244394","citation_count":16,"is_preprint":false},{"pmid":"31050118","id":"PMC_31050118","title":"Influenza virus matrix protein M1 interacts with SLD5 to block host cell cycle.","date":"2019","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/31050118","citation_count":14,"is_preprint":false},{"pmid":"16338220","id":"PMC_16338220","title":"Identification and characterization of mouse PSF1-binding protein, SLD5.","date":"2005","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/16338220","citation_count":13,"is_preprint":false},{"pmid":"37508549","id":"PMC_37508549","title":"The Molecular Pathogenesis of Tumor-Suppressive miR-486-5p and miR-486-3p Target Genes: GINS4 Facilitates Aggressiveness in Lung 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":"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":"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":"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":"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":10182,"output_tokens":3315,"usd":0.040135},"stage2":{"model":"claude-opus-4-6","input_tokens":6738,"output_tokens":2948,"usd":0.161085},"total_usd":0.20122,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"GINS4 (SLD5) was identified as a PSF1-binding protein via yeast two-hybrid; SLD5 interacts with the central region of PSF1 and co-localizes with PSF1 when overexpressed, suggesting cooperation in immature cell proliferation.\",\n      \"method\": \"Yeast two-hybrid, co-localization by immunofluorescence\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, yeast two-hybrid plus co-localization, no functional mutagenesis\",\n      \"pmids\": [\"16338220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Drosophila Sld5 (GINS4 ortholog) interacts with Psf1, Psf2, and Mcm10; mutations in Sld5 cause M and S phase delays with chromosomal instability, establishing its role in the CMG helicase complex and genomic integrity.\",\n      \"method\": \"Co-immunoprecipitation, genetic loss-of-function in Drosophila with cell cycle and cytological readouts\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus genetic phenotype in multicellular organism, single lab\",\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 peri-implantation stage, demonstrating SLD5 is essential for early embryogenesis and cell proliferation.\",\n      \"method\": \"Gene knockout in mice with histological and proliferation readouts\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined embryonic phenotype in mouse model\",\n      \"pmids\": [\"24244394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Attenuation of SLD5 expression causes marked DNA damage in both normal and cancer cells, and delays DNA repair and cell cycle restoration specifically in normal cells but not in cancer cells, indicating SLD5 has a protective role against DNA damage beyond its DNA replication function.\",\n      \"method\": \"siRNA knockdown with DNA damage assays (γH2AX), cell cycle analysis, comet assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined cellular phenotype, single lab\",\n      \"pmids\": [\"25334017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GINS4 (Sld5) recruits SIK1 (salt-inducible kinase 1) to replication sites at the onset of S phase by direct interaction; SIK1 then phosphorylates MCM2 at five conserved N-terminal residues, which is essential for MCM helicase activation.\",\n      \"method\": \"Co-immunoprecipitation, chromatin fractionation, in vitro kinase assay, site-directed mutagenesis, siRNA depletion\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay with mutagenesis plus Co-IP and functional depletion, multiple orthogonal methods\",\n      \"pmids\": [\"27592030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sld5 localizes to centrosomes and is required for maintaining centriolar satellites clustered around centrosomes; depletion of Sld5 disperses satellites, prevents pericentrin recruitment, and renders centrosomes unable to resist CENP-E- and Kid-mediated microtubular pulling forces, causing monocentriolar and acentriolar spindle poles during chromosome congression.\",\n      \"method\": \"Immunofluorescence localization, siRNA knockdown, live imaging, epistasis with CENP-E/Kid/HSET inhibition\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined mitotic phenotype plus epistasis with motor proteins, multiple orthogonal methods\",\n      \"pmids\": [\"29061732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GINS4 directly binds Rac1 and CDC42 (demonstrated by co-IP and GST pull-down), activating their GTPase activity and downstream pathways, thereby promoting gastric cancer cell growth and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, GTPase activation assays, cDNA array, in vitro and in vivo functional assays\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding by GST pull-down plus GTPase activation assay plus functional rescue, multiple 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 of GINS4 mRNA and stabilizes it, increasing GINS4 expression at the post-transcriptional level in non-small cell lung cancer.\",\n      \"method\": \"RNA immunoprecipitation, Co-immunoprecipitation, overexpression/knockdown rescue experiments\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP and Co-IP with rescue experiments, single lab\",\n      \"pmids\": [\"31253190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Influenza virus M1 protein interacts with SLD5 and blocks host cell cycle at G0/G1; overexpression of SLD5 partially rescues M1-induced G0/G1 arrest, demonstrating SLD5 is a target of viral cell cycle manipulation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, cell cycle analysis by flow cytometry, SLD5 transgenic mouse infection model\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid plus Co-IP plus cell cycle rescue plus in vivo transgenic model, single lab\",\n      \"pmids\": [\"31050118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Matrix proteins of VSV, SeV, and HIV also interact with SLD5 and induce G0/G1 cell cycle arrest; SLD5 overexpression partially rescues VSV/SeV-induced arrest and suppresses VSV replication while enhancing type I interferon signaling, indicating targeting SLD5 is a common viral strategy.\",\n      \"method\": \"Co-immunoprecipitation, cell cycle analysis, viral replication assays, interferon signaling measurement\",\n      \"journal\": \"The Journal of general virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional cell cycle rescue plus antiviral assays, single lab\",\n      \"pmids\": [\"34882534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Partial loss-of-function biallelic mutations in GINS4 impair GINS complex assembly and expression, causing delayed cell cycle progression and a cell-intrinsic defect in NK cell development without increased replication stress, defining GINS4 as necessary for NK cell differentiation.\",\n      \"method\": \"Exome sequencing, GINS4 knockdown, GINS complex assembly assay (Co-IP/western blot), in vitro NK cell differentiation, cell cycle analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human disease variants plus functional KD with complex assembly assay and in vitro NK differentiation rescue, multiple orthogonal methods\",\n      \"pmids\": [\"36345943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GINS4 suppresses p53 stability by activating Snail, which antagonizes p53 acetylation; p53 lysine residue K351 is the key acetylation site through which GINS4 inhibits p53-mediated ferroptosis, particularly in G2/M cells.\",\n      \"method\": \"CRISPR/Cas9 KO, ferroptosis assays, western blot for p53 acetylation, site-directed mutagenesis of p53 K351, cell cycle analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — CRISPR KO with mutagenesis of key residue and mechanistic pathway dissection, multiple orthogonal methods\",\n      \"pmids\": [\"37018198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GINS4 directly binds POLE2 (DNA polymerase epsilon subunit 2); GINS4 silencing reduces POLE2 expression and suppresses PI3K/AKT signaling, while POLE2 overexpression reverses the effects of GINS4 knockdown on proliferation, cell cycle, and ferroptosis in hepatocellular carcinoma cells.\",\n      \"method\": \"STRING/HDOCK binding prediction, Co-immunoprecipitation/co-localization, GINS4 knockdown, POLE2 overexpression rescue, in vivo xenograft\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — binding predicted computationally and partially validated, rescue experiment supports pathway placement, single lab\",\n      \"pmids\": [\"40081544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GINS4 directly interacts with p65 NF-κB and promotes its phosphorylation and acetylation, driving inflammatory cytokine expression (IL-6, IL-1β, IL-18, IFN-γ, TNF-α) in hyperoxia-induced lung injury.\",\n      \"method\": \"Co-immunoprecipitation, western blot for p65 phosphorylation/acetylation, in vivo neonatal rat BPD model\",\n      \"journal\": \"Molecular biotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP showing direct interaction with PTM readout, single lab, in vivo corroboration\",\n      \"pmids\": [\"41144169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"α5-nAChR (encoded by CHRNA5) mediates nicotine-induced GINS4 expression via STAT3 signaling, promoting LUAD cell proliferation, migration, and invasion; CHRNA5 silencing reduces GINS4 expression.\",\n      \"method\": \"siRNA knockdown, western blot, in vitro functional assays, xenograft models\",\n      \"journal\": \"Food and chemical toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined pathway (STAT3→GINS4) and functional readouts, validated in vivo, single lab\",\n      \"pmids\": [\"41192616\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GINS4 (SLD5) is a core subunit of the tetrameric GINS complex that forms the CMG (CDC45-MCM2-7-GINS) replicative helicase required for DNA replication initiation and elongation; beyond replication, GINS4 localizes to centrosomes to maintain centriolar satellite integrity and spindle pole resistance, recruits SIK1 kinase to phosphorylate MCM2 for helicase activation, directly binds and activates Rac1/CDC42 GTPases to promote cell migration, suppresses p53-mediated ferroptosis by activating Snail-dependent antagonism of p53 acetylation at K351, interacts with p65 NF-κB to promote its phosphorylation and acetylation, and is subject to post-transcriptional stabilization by LSH binding to its 3'UTR and upstream regulation by multiple miRNAs and circRNA sponges.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GINS4 (SLD5) is a core subunit of the tetrameric GINS complex essential for DNA replication, centrosome integrity, cell cycle progression, and suppression of ferroptosis. As a GINS subunit, it participates in CMG helicase assembly and activation—recruiting SIK1 kinase to phosphorylate MCM2 for helicase firing [PMID:27592030]—and its disruption causes embryonic lethality, DNA damage accumulation, and impaired GINS complex assembly that selectively blocks NK cell differentiation [PMID:24244394, PMID:25334017, PMID:36345943]. Beyond replication, GINS4 localizes to centrosomes where it maintains centriolar satellite clustering and spindle pole integrity during mitosis [PMID:29061732], directly binds and activates Rac1/CDC42 GTPases to promote cell migration [PMID:31754397], and suppresses p53-mediated ferroptosis by activating Snail to antagonize p53 acetylation at K351 [PMID:37018198]. Biallelic partial loss-of-function mutations in GINS4 cause a human immunodeficiency characterized by defective NK cell development [PMID:36345943].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of GINS4 as a PSF1-interacting partner established it as a candidate GINS complex subunit involved in proliferating cell populations.\",\n      \"evidence\": \"Yeast two-hybrid screen and co-localization by immunofluorescence in human cells\",\n      \"pmids\": [\"16338220\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Interaction mapped only by yeast two-hybrid without endogenous Co-IP\",\n        \"Functional consequence of the interaction not tested\",\n        \"No evidence yet for role in DNA replication per se\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic loss-of-function of the Drosophila GINS4 ortholog demonstrated that it is required for normal S and M phase progression and chromosomal stability, anchoring it functionally within the CMG helicase complex.\",\n      \"evidence\": \"Co-immunoprecipitation with Psf1/Psf2/Mcm10 and mutant cytological analysis in Drosophila\",\n      \"pmids\": [\"20709026\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Phenotype described in Drosophila only; mammalian validation pending\",\n        \"Direct contribution to helicase enzymatic activity not tested\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mouse knockout established that GINS4 is indispensable for mammalian cell proliferation and embryonic viability, confirming its non-redundant role in vivo.\",\n      \"evidence\": \"Targeted gene disruption in mice; peri-implantation lethality with inner cell mass proliferation defect\",\n      \"pmids\": [\"24244394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism of lethality (replication vs. other functions) not dissected\",\n        \"Conditional knockout in specific tissues not performed\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Knockdown experiments revealed that GINS4 protects normal cells from DNA damage and facilitates DNA repair, extending its function beyond replication fork progression.\",\n      \"evidence\": \"siRNA knockdown with γH2AX foci, comet assay, and cell cycle analysis in normal vs. cancer cells\",\n      \"pmids\": [\"25334017\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking GINS4 to DNA repair pathway not identified\",\n        \"Differential response between normal and cancer cells unexplained at the molecular level\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery that GINS4 recruits SIK1 kinase to chromatin at S-phase onset to phosphorylate MCM2 provided a direct mechanism for how GINS4 participates in replicative helicase activation.\",\n      \"evidence\": \"Co-immunoprecipitation, chromatin fractionation, in vitro kinase assay with site-directed mutagenesis, siRNA depletion\",\n      \"pmids\": [\"27592030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether SIK1 recruitment is the sole mechanism of GINS4-dependent MCM activation is unknown\",\n        \"Structural basis of the GINS4–SIK1 interaction not resolved\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Localization of GINS4 to centrosomes and its requirement for centriolar satellite clustering revealed a replication-independent mitotic function in maintaining spindle pole integrity.\",\n      \"evidence\": \"Immunofluorescence, siRNA knockdown, live imaging, epistasis with CENP-E/Kid/HSET inhibition in human cells\",\n      \"pmids\": [\"29061732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How GINS4 is targeted to centrosomes is unknown\",\n        \"Whether centrosomal and replication functions are coordinately regulated is untested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Direct binding and activation of Rac1 and CDC42 GTPases by GINS4 established a non-replicative signaling role in cell migration and metastasis.\",\n      \"evidence\": \"GST pull-down, GTPase activation assays, cDNA array, in vitro and in vivo gastric cancer functional assays\",\n      \"pmids\": [\"31754397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural determinants of GINS4–Rac1/CDC42 interaction unknown\",\n        \"Whether GTPase activation occurs through GEF-like activity or displacement of GDI not determined\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of GINS4 as a common target of viral matrix proteins (influenza M1, and later VSV/SeV/HIV) that exploit it to induce G0/G1 arrest revealed GINS4 as a node in host–virus cell cycle regulation.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, cell cycle rescue by SLD5 overexpression, transgenic mouse infection model; extended to multiple viruses in 2021\",\n      \"pmids\": [\"31050118\", \"34882534\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which viral matrix protein binding to GINS4 triggers G0/G1 arrest not defined\",\n        \"Whether the interaction surface overlaps with GINS complex assembly is unknown\",\n        \"Findings from a single laboratory; independent replication pending\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Human biallelic GINS4 mutations causing impaired GINS complex assembly and selective NK cell developmental failure defined GINS4 as a Mendelian immunodeficiency gene and demonstrated lineage-specific sensitivity to partial GINS loss.\",\n      \"evidence\": \"Exome sequencing, GINS4 knockdown, GINS complex assembly Co-IP, in vitro NK cell differentiation assay\",\n      \"pmids\": [\"36345943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Why NK cells are selectively affected among immune lineages is unclear\",\n        \"Whether residual GINS4 function supports replication adequately in other lineages not tested in patients\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"GINS4 was shown to suppress p53-mediated ferroptosis via a Snail–p53-K351 acetylation axis, revealing a cell-death regulatory function particularly active in G2/M phase.\",\n      \"evidence\": \"CRISPR/Cas9 knockout, ferroptosis assays, p53-K351 site-directed mutagenesis, cell cycle fractionation\",\n      \"pmids\": [\"37018198\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How GINS4 activates Snail transcription or stability is not defined\",\n        \"Whether this ferroptosis-suppressive function operates independently of the GINS replication complex is unclear\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"GINS4 was found to interact with POLE2 and p65 NF-κB, linking it to PI3K/AKT signaling in hepatocellular carcinoma and to NF-κB-driven inflammatory cytokine expression in lung injury, respectively.\",\n      \"evidence\": \"Co-immunoprecipitation, knockdown/overexpression rescue, xenograft models (POLE2); Co-IP with p65 phosphorylation/acetylation readouts in neonatal rat BPD model (NF-κB)\",\n      \"pmids\": [\"40081544\", \"41144169\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"POLE2 binding predicted computationally and validated by single-lab Co-IP only\",\n        \"Mechanism by which GINS4 promotes p65 post-translational modifications not identified\",\n        \"Independence of these signaling roles from GINS complex context not established\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GINS4's replication-dependent and replication-independent functions (centrosome maintenance, GTPase activation, ferroptosis suppression, NF-κB signaling) are structurally partitioned and coordinately regulated remains an open question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model distinguishing GINS-complex-bound vs. free GINS4 interaction surfaces\",\n        \"No temporal or spatial separation of replication vs. non-replication functions resolved in single cells\",\n        \"Lineage-specific essentiality mechanisms (e.g., NK cells) lack molecular explanation\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 6, 11, 13]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [1, 2, 4, 10]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 3, 5, 8, 9]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 13]}\n    ],\n    \"complexes\": [\n      \"GINS complex\",\n      \"CMG helicase (CDC45-MCM2-7-GINS)\"\n    ],\n    \"partners\": [\n      \"PSF1\",\n      \"SIK1\",\n      \"MCM2\",\n      \"RAC1\",\n      \"CDC42\",\n      \"RELA\",\n      \"POLE2\",\n      \"SNAI1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}