{"gene":"GIMAP5","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2003,"finding":"GIMAP5 (Irod/Ian5) protects Jurkat T-cells against okadaic acid- and gamma-radiation-induced apoptosis by antagonizing a calmodulin-dependent protein kinase II (CaMKII)-dependent step upstream of caspase-3 activation. The protein localizes to the centrosomal/Golgi/endoplasmic reticulum compartment, and deletion of either the C-terminal membrane-binding domain or the N-terminal GTP-binding domain did not abolish antiapoptotic function; the central coiled-coil domain was responsible for centrosomal anchoring and apoptosis resistance.","method":"Overexpression in Jurkat cells, deletion mutagenesis, caspase-3 activity assay, CaMKII inhibitor experiments, confocal microscopy","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional mutagenesis combined with inhibitor epistasis and localization in a single study; single lab","pmids":["12925764"],"is_preprint":false},{"year":2004,"finding":"A transgenic rescue experiment demonstrated that wild-type Ian5 (GIMAP5) protein is directly and specifically required for maintaining normal peripheral T cell numbers: a 150-kb PAC transgene harboring wild-type Ian5 completely restored T cell lymphopenia in F344.lyp/lyp rats carrying the frameshift mutation.","method":"Transgenic rescue (PAC transgene) in F344.lyp/lyp rats with quantitative T cell reconstitution","journal":"Physiological genomics","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct genetic complementation in a whole-organism model; single rigorous study with definitive phenotypic rescue","pmids":["15328390"],"is_preprint":false},{"year":2007,"finding":"GIMAP5 localizes to a sedimentable subcellular fraction distinct from mitochondria and ER in primary rat T lymphocytes. Despite this distinct localization, T cells from GIMAP5-deficient rats display rapid loss of mitochondrial membrane potential, indicating GIMAP5 regulates T lymphocyte survival through mechanisms operating upstream of mitochondria.","method":"Subcellular fractionation, confocal microscopy with epitope-tagged GIMAP5 (intact C-terminal membrane anchor), mitochondrial membrane potential assay in primary T cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal localization methods plus functional mitochondrial readout; single lab","pmids":["17655828"],"is_preprint":false},{"year":2007,"finding":"Overexpression of GIMAP5 in Jurkat cells and naive human T cells induced apoptosis, while siRNA-mediated knockdown did not affect apoptosis. Both wild-type rat Gimap5 and the BBDP frameshift mutant (Gimap5-lyp) induced apoptosis upon overexpression in rat T cells, with Gimap5-lyp causing greater cell death. GIMAP5 was localized to the endoplasmic reticulum, and endogenous GIMAP5 mRNA was upregulated in activated T cells.","method":"siRNA knockdown, transient overexpression, flow cytometry (apoptosis), qPCR, subcellular localization (confocal microscopy)","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — both loss-of-function and gain-of-function tested with multiple cell types; single lab","pmids":["17369194"],"is_preprint":false},{"year":2008,"finding":"Selective gene ablation of mouse Gimap5 impairs final intrathymic maturation of CD8 and CD4 T cells and compromises survival of postthymic CD4 and CD8 cells. Gimap5 deficiency also blocks NK and NKT cell differentiation; NK/NKT development is restored by transfer of Gimap5−/− bone marrow into a wild-type environment, demonstrating a cell-extrinsic component for NK/NKT rescue.","method":"Conditional gene knockout in mice, bone marrow transfer, flow cytometric analysis of lymphocyte subsets","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular phenotypes across multiple lineages, rescue experiment; replicates BB rat findings","pmids":["18796632"],"is_preprint":false},{"year":2008,"finding":"Loss of GIMAP5 impairs calcium flux in T lymphocytes: Gimap5-deficient T cells show diminished Ca2+ influx following thapsigargin treatment or TCR stimulation, while thapsigargin-induced Ca2+ release from intracellular stores is unaffected. The defect is manifested in mature single-positive thymocytes, where the survival defect first occurs.","method":"Intracellular Ca2+ flux assays (thapsigargin, TCR stimulation) in BBDP rat T cells and thymocytes","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined molecular defect (store-operated Ca2+ entry) with cell-type specificity; single lab","pmids":["19007993"],"is_preprint":false},{"year":2009,"finding":"In Gimap5-deficient (BBDP) rat T cells, ER stress markers (chaperones) are elevated and apoptotic signaling proceeds through CHOP (C/EBP-homologous protein). siRNA-mediated knockdown of CHOP protected Gimap5-deficient T cells from ER stress-induced apoptosis, establishing CHOP as a downstream effector of GIMAP5 deficiency in T cell death.","method":"Western blot for ER stress chaperones, siRNA knockdown of CHOP, apoptosis assays in primary T cells from Gimap5−/− rats","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis identifies CHOP as downstream effector; single lab, two orthogonal methods","pmids":["19424493"],"is_preprint":false},{"year":2010,"finding":"Gimap5 is required for lymphocyte quiescence and antigen-receptor-induced proliferation. A P-loop missense mutation in Gimap5 (ENU-induced) causes CD4+ T cell and B cell failure to proliferate upon antigen-receptor stimulation despite normal NF-κB, MAP kinase, and Akt activation. Fetal liver chimera experiments demonstrated this is hematopoietic cell-intrinsic. Antibiotic treatment and adoptive transfer of Rag-sufficient splenocytes ameliorated intestinal inflammation.","method":"ENU mutagenesis, fetal liver chimera transplantation, lymphocyte proliferation assays, signaling pathway analysis (NF-κB, MAPK, Akt), antibiotic treatment, adoptive transfer","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal in vivo and in vitro methods, chimera rescue, epistasis with signaling pathways; single lab with rigorous controls","pmids":["20190135"],"is_preprint":false},{"year":2010,"finding":"Endogenous GIMAP5 localizes to lysosomes and multivesicular bodies in lymphoid cells (rat, mouse, and human systems), as established by confocal microscopy with lysosomal markers, subcellular fractionation with immunoblotting, and electron microscopy of inducible epitope-tagged GIMAP5 in Jurkat cells. GIMAP1, in contrast, localizes to the Golgi.","method":"Confocal microscopy with lysosomal markers, subcellular fractionation + immunoblotting using novel monoclonal antibodies, electron microscopy in inducible Jurkat cells","journal":"Self/nonself","confidence":"High","confidence_rationale":"Tier 2 / Strong — three orthogonal methods (confocal, fractionation, EM) across three species with endogenous protein detection","pmids":["21487483"],"is_preprint":false},{"year":2011,"finding":"Gimap5 binds Bcl-2 family members. Gimap5 deficiency disrupts the interaction between Mcl-1 and HSC70, enhancing Mcl-1 degradation and compromising mitochondrial integrity in hematopoietic progenitor cells. Gimap5-deficient HSCs show more apoptosis and defective long-term repopulation capacity.","method":"Co-immunoprecipitation (Gimap5-Bcl-2 and Mcl-1/HSC70 interaction), apoptosis assays, bone marrow transplantation/repopulation assays","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifies Mcl-1/HSC70 interaction disruption; in vivo repopulation; single lab","pmids":["21502331"],"is_preprint":false},{"year":2011,"finding":"In Gimap5-deficient mice, CD4+ T cells become Th1/Th17 polarized and drive colitis. Loss of Gimap5 is associated with progressive loss of Foxo1, Foxo3, and Foxo4 protein expression in CD4+ T cells, and regulatory T cells are reduced in frequency with impaired immunosuppressive capacity.","method":"ENU mutant mouse model, intracellular cytokine staining, Foxo protein expression (Western blot), Treg functional assays","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple immune cell readouts with protein-level validation; single lab","pmids":["22106000"],"is_preprint":false},{"year":2013,"finding":"GIMAP5 promotes mitochondrial Ca2+ accumulation following capacitative entry. Overexpression of GIMAP5 in HEK-293 cells increases mitochondrial Ca2+ sequestration; microtubule disruption (but not actin disruption) abrogated mitochondrial Ca2+ buffering in primary T cells. GIMAP5 partially co-localizes with tubulin in HEK-293 cells.","method":"Ca2+ imaging in primary rat T cells and HEK-293 overexpression, microtubule/actin disruption pharmacology, confocal co-localization","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in HEK cells plus pharmacological dissection; single lab","pmids":["23098229"],"is_preprint":false},{"year":2013,"finding":"Gimap3 and Gimap5 cooperate to maintain T cell numbers. Double knockout of Gimap3 and Gimap5 causes more severe T cell lymphopenia than Gimap5 single knockout. Retroviral overexpression of Gimap3 elevated T cell production in irradiated mice; shRNA knockdown reduced it. Both Gimap3 and Gimap5 associate with antiapoptotic Bcl-2 family proteins.","method":"Double KO mouse generation, competitive hematopoietic transplantation, retroviral overexpression, shRNA knockdown, flow cytometric T cell counting, Co-IP","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (double KO), multiple in vivo functional assays, protein interaction; single lab with rigorous controls","pmids":["24510501"],"is_preprint":false},{"year":2015,"finding":"Loss of Gimap5 results in increased basal activation of mTOR (mammalian target of rapamycin) and constitutive activation of the PI3K pathway in T lymphocytes, independent of PP2A or AMPK.","method":"Phospho-protein immunoblotting (mTOR, Akt, PI3K pathway), pharmacological inhibitors (rapamycin, PP2A inhibitor, AMPK inhibitor) in Gimap5-deficient mouse T cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological epistasis combined with protein phosphorylation assays; single lab","pmids":["26440416"],"is_preprint":false},{"year":2015,"finding":"Quantitative changes in Gimap5 expression affect mitochondrial DNA (mtDNA) segregation in mouse hematopoietic tissues, consistent with its lysosomal localization. Gimap5 encodes a lysosomal protein, whereas its paralog Gimap3 localizes to the endoplasmic reticulum (not mitochondria as previously reported).","method":"Heteroplasmic mouse model, allele-specific expression analysis, uORF translational regulation analysis, subcellular localization studies","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model with quantitative mtDNA segregation readout; single lab","pmids":["25808953"],"is_preprint":false},{"year":2016,"finding":"Functional Gimap5 is required for optimal TCR signaling and IL-7 receptor signaling in T cells: T cells from Gimap5-deficient OTII TCR-transgenic mice fail to proliferate to cognate antigen, and Gimap5-deficient T cells (rat and mouse) show decreased STAT5 phosphorylation following IL-7 stimulation.","method":"Antigen-specific proliferation assay (OTII), STAT5 phosphorylation by Western blot/flow cytometry following IL-7 stimulation, loss-of-function mouse and rat models","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal signaling readouts in two species; single lab","pmids":["27023180"],"is_preprint":false},{"year":2018,"finding":"Gimap5 is essential for inactivation of glycogen synthase kinase-3β (GSK3β) following T cell activation. In the absence of Gimap5, constitutively active GSK3β constrains c-Myc induction and NFATc1 nuclear import, limiting CD4+ T cell proliferation. Gimap5 also facilitates Ser389 phosphorylation and nuclear translocation of GSK3β to limit DNA damage. Pharmacological or genetic inhibition of GSK3β rescues Gimap5-deficient CD4+ T cells and ameliorates immunopathology in mice. A human patient with GIMAP5 loss-of-function shows lymphopenia and impaired T cell proliferation rescued by GSK3 inhibitors.","method":"KO mice, phospho-GSK3β/c-Myc/NFATc1 immunoblot and nuclear import assays, pharmacological GSK3β inhibition, conditional genetic GSK3β targeting, in vitro proliferation assays with human patient cells, rescue experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (biochemical, genetic, pharmacological) in both mouse and human models, with rescue experiments; single lab but highly rigorous","pmids":["29382851"],"is_preprint":false},{"year":2018,"finding":"Gimap5 deficiency causes increased DNA damage in CD4+ T cells particularly under TH1-polarizing conditions. TGF-β can control DNA damage in Gimap5-deficient cells, thereby promoting TH17 polarization as a selective survival mechanism.","method":"T cell polarization assays, DNA damage quantification (γH2AX), TGF-β treatment, conditional Gimap5fl/flCd4Cre/ert2 mice, human GIMAP5 LOF patient cells","journal":"The Journal of allergy and clinical immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic link between DNA damage and TH17 bias with pharmacological rescue; single lab","pmids":["30616774"],"is_preprint":false},{"year":2021,"finding":"GIMAP5 is expressed in hepatic endothelial cells; its loss (in humans via homozygous damaging mutations and in mice via knockout) results in capillarization of liver sinusoidal endothelial cells (LSECs). Endothelial cell-selective deletion of GIMAP5 reproduces this phenotype. Single-cell RNA-seq places GIMAP5 upstream of GATA4, a transcription factor required for LSEC specification.","method":"Human genetic analysis (homozygous mutation identification), mouse KO, endothelial cell-selective conditional KO, single-cell RNA-sequencing, histology/immunofluorescence for LSEC markers","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetics corroborated by mouse KO and endothelial-selective conditional KO; scRNA-seq pathway placement; multiple orthogonal approaches","pmids":["33956074"],"is_preprint":false},{"year":2021,"finding":"Gimap5 interacts with M6PR (mannose-6-phosphate receptor) and promotes M6PR translocation from cytoplasm to the cell membrane, thereby inhibiting PADI4-mediated EMT in lung cancer cell lines.","method":"Co-IP combined with mass spectrometry, overexpression in lung cancer cell lines, immunofluorescence for M6PR distribution, migration/invasion/proliferation assays","journal":"Frontiers in oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP/MS with partial follow-up in non-immune cancer cell lines; single lab","pmids":["34604035"],"is_preprint":false},{"year":2023,"finding":"MFSD1 and GLMP associate with GIMAP5 in a protein complex. MFSD1 and GLMP interactions with GIMAP5 are essential to maintain normal GIMAP5 expression levels, which in turn support lymphocyte development and liver homeostasis.","method":"Proteomic analysis (MS) of MFSD1 interactome, ENU alleles + germline KO of Mfsd1/Glmp/Gimap5, immunoblotting for GIMAP5 protein levels, flow cytometry for lymphocyte populations","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic interaction discovery validated by triple KO genetics showing GIMAP5 protein loss; single lab","pmids":["38055739"],"is_preprint":false},{"year":2023,"finding":"Gimap5 promotes RSV degradation in lysosomes by interacting with M6PR and prevents RSV invasion by downregulating expression of the RSV surface receptor IGF1R.","method":"Co-IP, Western blot, immunofluorescence, transmission electron microscopy of RSV degradation in Gimap5-overexpressed or -silenced cell lines","journal":"Journal of medical virology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single Co-IP with TEM; no mutagenesis or reconstitution","pmids":["36484389"],"is_preprint":false},{"year":2024,"finding":"GIMAP5 restricts pathological accumulation of long-chain ceramides (CERs) by interacting with protein kinase CK2 and attenuating CK2's ability to activate ceramide synthases. Inhibition of CK2 or ceramide synthase rescues GIMAP5-deficient T cells from CER overaccumulation and cell deterioration.","method":"Co-IP (GIMAP5-CK2 interaction), lipidomic profiling, CK2 and ceramide synthase pharmacological inhibition, functional rescue of GIMAP5-deficient T cells, human genetic disease characterization","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical interaction, lipidomics, pharmacological rescue, human genetics all converging on a single mechanism; single lab with multiple orthogonal methods","pmids":["38172257"],"is_preprint":false}],"current_model":"GIMAP5 is a small GTPase localized primarily to lysosomes/multivesicular bodies in lymphoid cells that promotes T lymphocyte and hematopoietic progenitor survival through several converging mechanisms: it maintains ER homeostasis (preventing CHOP-mediated apoptosis), facilitates mitochondrial Ca2+ buffering, supports inactivation of GSK3β (enabling c-Myc induction, NFATc1 nuclear import, and DNA damage control) after T cell activation, restrains mTOR/PI3K pathway hyperactivation, and restricts pathological long-chain ceramide accumulation by interacting with protein kinase CK2 to attenuate ceramide synthase activity; additionally, GIMAP5 interacts with Bcl-2 family proteins (including Mcl-1 via HSC70), is stabilized by a lysosomal complex with MFSD1 and GLMP, and is required in hepatic endothelial cells for liver sinusoidal endothelial cell specification upstream of GATA4."},"narrative":{"mechanistic_narrative":"GIMAP5 is a small GTP-binding protein required for the survival and homeostasis of T lymphocytes and hematopoietic progenitors, established by genetic complementation that rescued T cell lymphopenia in mutant rats [PMID:15328390] and by knockout models showing impaired intrathymic maturation and post-thymic survival of T cells [PMID:18796632]. Endogenous GIMAP5 localizes to lysosomes and multivesicular bodies in lymphoid cells across rat, mouse, and human systems [PMID:21487483], and its expression is stabilized by association with the lysosomal MFSD1/GLMP complex, loss of which depletes GIMAP5 and impairs lymphocyte development and liver homeostasis [PMID:38055739]. GIMAP5 supports lymphocyte survival through several converging mechanisms: it maintains ER homeostasis to prevent CHOP-mediated apoptosis [PMID:19424493], promotes mitochondrial Ca2+ buffering in a microtubule-dependent manner [PMID:23098229], and binds antiapoptotic Bcl-2 family proteins, stabilizing Mcl-1 via HSC70 to preserve mitochondrial integrity in progenitors [PMID:21502331]. Upon T cell activation, GIMAP5 is required for inactivation of GSK3β, thereby enabling c-Myc induction, NFATc1 nuclear import, and control of DNA damage to permit proliferation; GSK3 inhibition rescues GIMAP5-deficient mouse and human patient T cells [PMID:29382851], and GIMAP5 loss also drives constitutive mTOR/PI3K activation [PMID:26440416]. GIMAP5 further restricts pathological long-chain ceramide accumulation by interacting with protein kinase CK2 and attenuating ceramide synthase activation [PMID:38172257]. Beyond the immune system, GIMAP5 is required cell-intrinsically in hepatic endothelial cells for liver sinusoidal endothelial specification upstream of GATA4 [PMID:33956074]. Human loss-of-function mutations cause lymphopenia with impaired T cell proliferation [PMID:29382851, PMID:38172257].","teleology":[{"year":2003,"claim":"Before its physiological role was known, GIMAP5 was found to act as an antiapoptotic factor, raising the question of how it protects cells from death.","evidence":"Overexpression and deletion mutagenesis in Jurkat cells with caspase-3 and CaMKII-inhibitor epistasis","pmids":["12925764"],"confidence":"Medium","gaps":["Localization assigned to centrosome/Golgi/ER conflicts with later lysosomal data","Overexpression-based; no endogenous loss-of-function","Antiapoptotic domain mapping not linked to a defined biochemical activity"]},{"year":2004,"claim":"Genetic complementation established that GIMAP5 is directly and specifically required for maintaining peripheral T cell numbers, moving it from correlation to causation.","evidence":"PAC transgene rescue of T cell lymphopenia in F344.lyp/lyp rats","pmids":["15328390"],"confidence":"High","gaps":["Does not reveal the molecular mechanism of survival support","Whole-organism rescue does not localize the cell-intrinsic requirement"]},{"year":2008,"claim":"Conditional knockout in mice defined the cellular phenotype, showing GIMAP5 is required across T, NK, and NKT lineages with a cell-extrinsic component for NK/NKT rescue.","evidence":"Conditional gene knockout and bone marrow transfer with flow cytometry","pmids":["18796632"],"confidence":"High","gaps":["Nature of the cell-extrinsic NK/NKT signal not identified","Biochemical basis of survival defect unresolved"]},{"year":2009,"claim":"ER stress signaling through CHOP was identified as a downstream effector of GIMAP5 loss, linking the protein to maintenance of ER homeostasis.","evidence":"ER chaperone immunoblotting and CHOP siRNA epistasis in Gimap5-deficient rat T cells","pmids":["19424493"],"confidence":"Medium","gaps":["How GIMAP5 prevents ER stress mechanistically unclear","Relationship to mitochondrial and Ca2+ defects not integrated"]},{"year":2011,"claim":"GIMAP5 was tied to mitochondrial integrity by showing it binds Bcl-2 family proteins and stabilizes Mcl-1 via HSC70 in hematopoietic progenitors.","evidence":"Co-immunoprecipitation, apoptosis assays, and bone marrow repopulation","pmids":["21502331"],"confidence":"Medium","gaps":["Direct vs indirect nature of Bcl-2 family binding not resolved","Co-IP without reciprocal structural validation"]},{"year":2013,"claim":"Two studies refined GIMAP5's role in Ca2+/mitochondrial physiology and its functional cooperation with the paralog Gimap3.","evidence":"Ca2+ imaging with microtubule disruption in HEK-293 and T cells; double-knockout genetic epistasis and transplantation","pmids":["23098229","24510501"],"confidence":"Medium","gaps":["Mechanism coupling GIMAP5 to mitochondrial Ca2+ uptake undefined","Whether GIMAP5/GIMAP3 act in a shared complex unknown"]},{"year":2010,"claim":"A P-loop missense mutation showed GIMAP5 is required cell-intrinsically for lymphocyte quiescence and antigen-receptor-driven proliferation, independent of canonical activation signaling.","evidence":"ENU mutagenesis, fetal liver chimeras, proliferation and signaling pathway analysis","pmids":["20190135"],"confidence":"High","gaps":["Why proliferation fails despite normal NF-κB/MAPK/Akt unexplained at this stage","GTPase activity of the P-loop not biochemically characterized"]},{"year":2018,"claim":"GIMAP5 was placed in a defined signaling axis: it enables GSK3β inactivation after activation, permitting c-Myc induction, NFATc1 nuclear import, and DNA damage control, explaining the proliferation defect and offering a therapeutic handle.","evidence":"KO mice, phospho-GSK3β/c-Myc/NFATc1 assays, GSK3 inhibition and rescue including human patient cells","pmids":["29382851","30616774"],"confidence":"High","gaps":["How a lysosomal GTPase controls GSK3β phosphorylation mechanistically unclear","Connection between GSK3β axis and TH17 bias via DNA damage incompletely defined"]},{"year":2023,"claim":"Proteomics identified the lysosomal MFSD1/GLMP complex as required to maintain GIMAP5 protein levels, explaining its stability and lysosomal residence.","evidence":"MFSD1 interactome MS and triple KO genetics with GIMAP5 immunoblotting","pmids":["38055739"],"confidence":"Medium","gaps":["Whether the complex confers a transport or scaffolding function unknown","Structural organization of the GIMAP5/MFSD1/GLMP complex undefined"]},{"year":2024,"claim":"GIMAP5 was shown to restrict pathological long-chain ceramide accumulation by binding CK2 and attenuating ceramide synthase activation, providing a lipid-metabolic mechanism linked to human disease.","evidence":"Co-IP, lipidomics, CK2/ceramide synthase inhibition with functional rescue and human genetics","pmids":["38172257"],"confidence":"High","gaps":["How a lysosomal GTPase regulates CK2 toward ceramide synthases unresolved","Integration of ceramide pathway with GSK3β and ER stress mechanisms not established"]},{"year":2021,"claim":"GIMAP5 was shown to function outside the immune system as a cell-intrinsic requirement for liver sinusoidal endothelial cell specification upstream of GATA4.","evidence":"Human genetics, mouse and endothelial-selective KO, single-cell RNA-seq, LSEC marker histology","pmids":["33956074"],"confidence":"High","gaps":["Mechanism by which GIMAP5 acts upstream of GATA4 unknown","Whether lysosomal/survival functions underlie the LSEC role unclear"]},{"year":null,"claim":"It remains unknown how a single lysosome-associated GTPase mechanistically integrates its diverse reported outputs—ER stress, mitochondrial Ca2+, Bcl-2 family stabilization, GSK3β inactivation, mTOR restraint, and CK2/ceramide control—and whether these reflect one primary biochemical activity with downstream consequences.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No defined enzymatic substrate or GTPase-cycle mechanism","No structural model of GIMAP5 or its complexes","Causal hierarchy among the multiple proposed pathways unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[9,12,22]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[9,11]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[8,14]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[8]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,6]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,7,16]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[6,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[13,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[18]}],"complexes":["GIMAP5-MFSD1-GLMP lysosomal complex"],"partners":["MFSD1","GLMP","MCL1","HSPA8","GIMAP3","CSNK2A1","M6PR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96F15","full_name":"GTPase IMAP family member 5","aliases":["Immune-associated nucleotide-binding protein 5","Immunity-associated nucleotide 4-like 1 protein","Immunity-associated nucleotide 5 protein","IAN-5","hIAN5","Immunity-associated protein 3"],"length_aa":307,"mass_kda":34.8,"function":"Plays a role in T lymphocyte development and the optimal generation of CD4/CD8 double-positive thymocytes (By similarity). Inhibitor of GSK3A, possibly by sequestering GSK3A in cytoplasmic vesicles and impairing its translocation to the nucleus. Consequently, impairs GSK3A-dependent transcriptional program and regulation of the DNA damage response occurring during T cells proliferation (PubMed:29382851). Required for the survival of peripheral T cells, natural killer (NK) and NK T-cell development and the maintenance of normal liver function (By similarity). May promote the survival of mature T lymphocytes upon cytokine withdrawal (By similarity). May regulate Ca(2+) homeostasis by modulating lysosomal Ca(2+) stores, preventing its accumulation in the absence of T cell activation (By similarity). May play a role in mitochondrial DNA segregation in hematopoietic tissues (By similarity). Is a regulator of liver endothelial cell homeostasis (By similarity)","subcellular_location":"Lysosome membrane; Endosome, multivesicular body membrane; Endosome membrane","url":"https://www.uniprot.org/uniprotkb/Q96F15/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GIMAP5","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GIMAP5","total_profiled":1310},"omim":[{"mim_id":"619463","title":"PORTAL HYPERTENSION, NONCIRRHOTIC, 2; NCPH2","url":"https://www.omim.org/entry/619463"},{"mim_id":"617068","title":"PORTAL HYPERTENSION, NONCIRRHOTIC, 1; NCPH1","url":"https://www.omim.org/entry/617068"},{"mim_id":"611507","title":"CDGSH IRON SULFUR DOMAIN PROTEIN 2; CISD2","url":"https://www.omim.org/entry/611507"},{"mim_id":"608087","title":"GTPase, IMAP FAMILY, MEMBER 4; GIMAP4","url":"https://www.omim.org/entry/608087"},{"mim_id":"608086","title":"GTPase, IMAP FAMILY, MEMBER 5; GIMAP5","url":"https://www.omim.org/entry/608086"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":99.5}],"url":"https://www.proteinatlas.org/search/GIMAP5"},"hgnc":{"alias_symbol":["HIMAP3","IAN5"],"prev_symbol":["IAN4L1"]},"alphafold":{"accession":"Q96F15","domains":[{"cath_id":"3.40.50.300","chopping":"27-256","consensus_level":"high","plddt":94.4711,"start":27,"end":256}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96F15","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96F15-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96F15-F1-predicted_aligned_error_v6.png","plddt_mean":89.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GIMAP5","jax_strain_url":"https://www.jax.org/strain/search?query=GIMAP5"},"sequence":{"accession":"Q96F15","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96F15.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96F15/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96F15"}},"corpus_meta":[{"pmid":"17220214","id":"PMC_17220214","title":"The human GIMAP5 gene has a common polyadenylation polymorphism increasing risk to systemic lupus erythematosus.","date":"2007","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17220214","citation_count":68,"is_preprint":false},{"pmid":"20190135","id":"PMC_20190135","title":"Loss of T cell and B cell quiescence precedes the onset of microbial flora-dependent wasting disease and intestinal inflammation in Gimap5-deficient mice.","date":"2010","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/20190135","citation_count":56,"is_preprint":false},{"pmid":"18796632","id":"PMC_18796632","title":"Impaired survival of peripheral T cells, disrupted NK/NKT cell development, and liver failure in mice lacking Gimap5.","date":"2008","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/18796632","citation_count":56,"is_preprint":false},{"pmid":"12925764","id":"PMC_12925764","title":"Irod/Ian5: an inhibitor of gamma-radiation- and okadaic 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mitochondrial integrity from a distinct subcellular compartment.","date":"2007","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/17655828","citation_count":28,"is_preprint":false},{"pmid":"14624755","id":"PMC_14624755","title":"Genetic dissection of lymphopenia from autoimmunity by introgression of mutated Ian5 gene onto the F344 rat.","date":"2003","source":"Journal of autoimmunity","url":"https://pubmed.ncbi.nlm.nih.gov/14624755","citation_count":28,"is_preprint":false},{"pmid":"17064701","id":"PMC_17064701","title":"Eosinophilic bowel disease controlled by the BB rat-derived lymphopenia/Gimap5 gene.","date":"2006","source":"Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/17064701","citation_count":26,"is_preprint":false},{"pmid":"33956074","id":"PMC_33956074","title":"GIMAP5 maintains liver endothelial cell homeostasis and prevents portal hypertension.","date":"2021","source":"The Journal of experimental 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/24510501","citation_count":23,"is_preprint":false},{"pmid":"23098229","id":"PMC_23098229","title":"GTPase of the immune-associated nucleotide-binding protein 5 (GIMAP5) regulates calcium influx in T-lymphocytes by promoting mitochondrial calcium accumulation.","date":"2013","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/23098229","citation_count":19,"is_preprint":false},{"pmid":"19007993","id":"PMC_19007993","title":"Loss of GIMAP5 (GTPase of immunity-associated nucleotide binding protein 5) impairs calcium signaling in rat T lymphocytes.","date":"2008","source":"Molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/19007993","citation_count":18,"is_preprint":false},{"pmid":"19762377","id":"PMC_19762377","title":"IAN5 polymorphisms are associated with systemic lupus erythematosus.","date":"2009","source":"Lupus","url":"https://pubmed.ncbi.nlm.nih.gov/19762377","citation_count":13,"is_preprint":false},{"pmid":"20817506","id":"PMC_20817506","title":"Notch protection against apoptosis in T-ALL cells mediated by GIMAP5.","date":"2010","source":"Blood cells, molecules & diseases","url":"https://pubmed.ncbi.nlm.nih.gov/20817506","citation_count":13,"is_preprint":false},{"pmid":"30616774","id":"PMC_30616774","title":"Loss of GTPase of immunity-associated protein 5 (Gimap5) promotes pathogenic CD4+ T-cell development and allergic airway disease.","date":"2018","source":"The Journal of allergy and clinical immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30616774","citation_count":12,"is_preprint":false},{"pmid":"19351909","id":"PMC_19351909","title":"Genetic dissection reveals diabetes loci proximal to the gimap5 lymphopenia gene.","date":"2009","source":"Physiological 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effects of leptin receptor mutation on male and female BBDR Gimap5-/Gimap5- spontaneously diabetic rats.","date":"2009","source":"Physiological genomics","url":"https://pubmed.ncbi.nlm.nih.gov/19996157","citation_count":9,"is_preprint":false},{"pmid":"15474297","id":"PMC_15474297","title":"The antiapoptotic gene Ian4l1 in the rat: genomic organization and promoter characterization.","date":"2004","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/15474297","citation_count":9,"is_preprint":false},{"pmid":"25808953","id":"PMC_25808953","title":"Quantitative changes in Gimap3 and Gimap5 expression modify mitochondrial DNA segregation in mice.","date":"2015","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25808953","citation_count":8,"is_preprint":false},{"pmid":"26440416","id":"PMC_26440416","title":"GIMAP5 Deficiency Is Associated with Increased AKT Activity in T Lymphocytes.","date":"2015","source":"PloS 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expression and preliminary function of chicken Gimap5 gene.","date":"2019","source":"PeerJ","url":"https://pubmed.ncbi.nlm.nih.gov/31579581","citation_count":3,"is_preprint":false},{"pmid":"32147998","id":"PMC_32147998","title":"[Expression and function characterization of Gimap5 gene from different breeds of broilers].","date":"2020","source":"Sheng wu gong cheng xue bao = Chinese journal of biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/32147998","citation_count":0,"is_preprint":false},{"pmid":"41042382","id":"PMC_41042382","title":"Quantitative temporal analysis of pancreatic islet T lymphocyte and macrophage infiltration heralded by serum IgE in congenic BioBreeding (BB) Gimap5-/- rats at risk for insulitis and acute onset diabetes.","date":"2025","source":"Inflammation research : official journal of the European Histamine Research Society ... [et al.]","url":"https://pubmed.ncbi.nlm.nih.gov/41042382","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":19045,"output_tokens":5958,"usd":0.073252,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14779,"output_tokens":4015,"usd":0.087135,"stage2_stop_reason":"end_turn"},"total_usd":0.160387,"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\": 2003,\n      \"finding\": \"GIMAP5 (Irod/Ian5) protects Jurkat T-cells against okadaic acid- and gamma-radiation-induced apoptosis by antagonizing a calmodulin-dependent protein kinase II (CaMKII)-dependent step upstream of caspase-3 activation. The protein localizes to the centrosomal/Golgi/endoplasmic reticulum compartment, and deletion of either the C-terminal membrane-binding domain or the N-terminal GTP-binding domain did not abolish antiapoptotic function; the central coiled-coil domain was responsible for centrosomal anchoring and apoptosis resistance.\",\n      \"method\": \"Overexpression in Jurkat cells, deletion mutagenesis, caspase-3 activity assay, CaMKII inhibitor experiments, confocal microscopy\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional mutagenesis combined with inhibitor epistasis and localization in a single study; single lab\",\n      \"pmids\": [\"12925764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A transgenic rescue experiment demonstrated that wild-type Ian5 (GIMAP5) protein is directly and specifically required for maintaining normal peripheral T cell numbers: a 150-kb PAC transgene harboring wild-type Ian5 completely restored T cell lymphopenia in F344.lyp/lyp rats carrying the frameshift mutation.\",\n      \"method\": \"Transgenic rescue (PAC transgene) in F344.lyp/lyp rats with quantitative T cell reconstitution\",\n      \"journal\": \"Physiological genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct genetic complementation in a whole-organism model; single rigorous study with definitive phenotypic rescue\",\n      \"pmids\": [\"15328390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GIMAP5 localizes to a sedimentable subcellular fraction distinct from mitochondria and ER in primary rat T lymphocytes. Despite this distinct localization, T cells from GIMAP5-deficient rats display rapid loss of mitochondrial membrane potential, indicating GIMAP5 regulates T lymphocyte survival through mechanisms operating upstream of mitochondria.\",\n      \"method\": \"Subcellular fractionation, confocal microscopy with epitope-tagged GIMAP5 (intact C-terminal membrane anchor), mitochondrial membrane potential assay in primary T cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal localization methods plus functional mitochondrial readout; single lab\",\n      \"pmids\": [\"17655828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Overexpression of GIMAP5 in Jurkat cells and naive human T cells induced apoptosis, while siRNA-mediated knockdown did not affect apoptosis. Both wild-type rat Gimap5 and the BBDP frameshift mutant (Gimap5-lyp) induced apoptosis upon overexpression in rat T cells, with Gimap5-lyp causing greater cell death. GIMAP5 was localized to the endoplasmic reticulum, and endogenous GIMAP5 mRNA was upregulated in activated T cells.\",\n      \"method\": \"siRNA knockdown, transient overexpression, flow cytometry (apoptosis), qPCR, subcellular localization (confocal microscopy)\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — both loss-of-function and gain-of-function tested with multiple cell types; single lab\",\n      \"pmids\": [\"17369194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Selective gene ablation of mouse Gimap5 impairs final intrathymic maturation of CD8 and CD4 T cells and compromises survival of postthymic CD4 and CD8 cells. Gimap5 deficiency also blocks NK and NKT cell differentiation; NK/NKT development is restored by transfer of Gimap5−/− bone marrow into a wild-type environment, demonstrating a cell-extrinsic component for NK/NKT rescue.\",\n      \"method\": \"Conditional gene knockout in mice, bone marrow transfer, flow cytometric analysis of lymphocyte subsets\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular phenotypes across multiple lineages, rescue experiment; replicates BB rat findings\",\n      \"pmids\": [\"18796632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Loss of GIMAP5 impairs calcium flux in T lymphocytes: Gimap5-deficient T cells show diminished Ca2+ influx following thapsigargin treatment or TCR stimulation, while thapsigargin-induced Ca2+ release from intracellular stores is unaffected. The defect is manifested in mature single-positive thymocytes, where the survival defect first occurs.\",\n      \"method\": \"Intracellular Ca2+ flux assays (thapsigargin, TCR stimulation) in BBDP rat T cells and thymocytes\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined molecular defect (store-operated Ca2+ entry) with cell-type specificity; single lab\",\n      \"pmids\": [\"19007993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Gimap5-deficient (BBDP) rat T cells, ER stress markers (chaperones) are elevated and apoptotic signaling proceeds through CHOP (C/EBP-homologous protein). siRNA-mediated knockdown of CHOP protected Gimap5-deficient T cells from ER stress-induced apoptosis, establishing CHOP as a downstream effector of GIMAP5 deficiency in T cell death.\",\n      \"method\": \"Western blot for ER stress chaperones, siRNA knockdown of CHOP, apoptosis assays in primary T cells from Gimap5−/− rats\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis identifies CHOP as downstream effector; single lab, two orthogonal methods\",\n      \"pmids\": [\"19424493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Gimap5 is required for lymphocyte quiescence and antigen-receptor-induced proliferation. A P-loop missense mutation in Gimap5 (ENU-induced) causes CD4+ T cell and B cell failure to proliferate upon antigen-receptor stimulation despite normal NF-κB, MAP kinase, and Akt activation. Fetal liver chimera experiments demonstrated this is hematopoietic cell-intrinsic. Antibiotic treatment and adoptive transfer of Rag-sufficient splenocytes ameliorated intestinal inflammation.\",\n      \"method\": \"ENU mutagenesis, fetal liver chimera transplantation, lymphocyte proliferation assays, signaling pathway analysis (NF-κB, MAPK, Akt), antibiotic treatment, adoptive transfer\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal in vivo and in vitro methods, chimera rescue, epistasis with signaling pathways; single lab with rigorous controls\",\n      \"pmids\": [\"20190135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Endogenous GIMAP5 localizes to lysosomes and multivesicular bodies in lymphoid cells (rat, mouse, and human systems), as established by confocal microscopy with lysosomal markers, subcellular fractionation with immunoblotting, and electron microscopy of inducible epitope-tagged GIMAP5 in Jurkat cells. GIMAP1, in contrast, localizes to the Golgi.\",\n      \"method\": \"Confocal microscopy with lysosomal markers, subcellular fractionation + immunoblotting using novel monoclonal antibodies, electron microscopy in inducible Jurkat cells\",\n      \"journal\": \"Self/nonself\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three orthogonal methods (confocal, fractionation, EM) across three species with endogenous protein detection\",\n      \"pmids\": [\"21487483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Gimap5 binds Bcl-2 family members. Gimap5 deficiency disrupts the interaction between Mcl-1 and HSC70, enhancing Mcl-1 degradation and compromising mitochondrial integrity in hematopoietic progenitor cells. Gimap5-deficient HSCs show more apoptosis and defective long-term repopulation capacity.\",\n      \"method\": \"Co-immunoprecipitation (Gimap5-Bcl-2 and Mcl-1/HSC70 interaction), apoptosis assays, bone marrow transplantation/repopulation assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifies Mcl-1/HSC70 interaction disruption; in vivo repopulation; single lab\",\n      \"pmids\": [\"21502331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In Gimap5-deficient mice, CD4+ T cells become Th1/Th17 polarized and drive colitis. Loss of Gimap5 is associated with progressive loss of Foxo1, Foxo3, and Foxo4 protein expression in CD4+ T cells, and regulatory T cells are reduced in frequency with impaired immunosuppressive capacity.\",\n      \"method\": \"ENU mutant mouse model, intracellular cytokine staining, Foxo protein expression (Western blot), Treg functional assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple immune cell readouts with protein-level validation; single lab\",\n      \"pmids\": [\"22106000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GIMAP5 promotes mitochondrial Ca2+ accumulation following capacitative entry. Overexpression of GIMAP5 in HEK-293 cells increases mitochondrial Ca2+ sequestration; microtubule disruption (but not actin disruption) abrogated mitochondrial Ca2+ buffering in primary T cells. GIMAP5 partially co-localizes with tubulin in HEK-293 cells.\",\n      \"method\": \"Ca2+ imaging in primary rat T cells and HEK-293 overexpression, microtubule/actin disruption pharmacology, confocal co-localization\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in HEK cells plus pharmacological dissection; single lab\",\n      \"pmids\": [\"23098229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Gimap3 and Gimap5 cooperate to maintain T cell numbers. Double knockout of Gimap3 and Gimap5 causes more severe T cell lymphopenia than Gimap5 single knockout. Retroviral overexpression of Gimap3 elevated T cell production in irradiated mice; shRNA knockdown reduced it. Both Gimap3 and Gimap5 associate with antiapoptotic Bcl-2 family proteins.\",\n      \"method\": \"Double KO mouse generation, competitive hematopoietic transplantation, retroviral overexpression, shRNA knockdown, flow cytometric T cell counting, Co-IP\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (double KO), multiple in vivo functional assays, protein interaction; single lab with rigorous controls\",\n      \"pmids\": [\"24510501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss of Gimap5 results in increased basal activation of mTOR (mammalian target of rapamycin) and constitutive activation of the PI3K pathway in T lymphocytes, independent of PP2A or AMPK.\",\n      \"method\": \"Phospho-protein immunoblotting (mTOR, Akt, PI3K pathway), pharmacological inhibitors (rapamycin, PP2A inhibitor, AMPK inhibitor) in Gimap5-deficient mouse T cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological epistasis combined with protein phosphorylation assays; single lab\",\n      \"pmids\": [\"26440416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Quantitative changes in Gimap5 expression affect mitochondrial DNA (mtDNA) segregation in mouse hematopoietic tissues, consistent with its lysosomal localization. Gimap5 encodes a lysosomal protein, whereas its paralog Gimap3 localizes to the endoplasmic reticulum (not mitochondria as previously reported).\",\n      \"method\": \"Heteroplasmic mouse model, allele-specific expression analysis, uORF translational regulation analysis, subcellular localization studies\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model with quantitative mtDNA segregation readout; single lab\",\n      \"pmids\": [\"25808953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Functional Gimap5 is required for optimal TCR signaling and IL-7 receptor signaling in T cells: T cells from Gimap5-deficient OTII TCR-transgenic mice fail to proliferate to cognate antigen, and Gimap5-deficient T cells (rat and mouse) show decreased STAT5 phosphorylation following IL-7 stimulation.\",\n      \"method\": \"Antigen-specific proliferation assay (OTII), STAT5 phosphorylation by Western blot/flow cytometry following IL-7 stimulation, loss-of-function mouse and rat models\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal signaling readouts in two species; single lab\",\n      \"pmids\": [\"27023180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Gimap5 is essential for inactivation of glycogen synthase kinase-3β (GSK3β) following T cell activation. In the absence of Gimap5, constitutively active GSK3β constrains c-Myc induction and NFATc1 nuclear import, limiting CD4+ T cell proliferation. Gimap5 also facilitates Ser389 phosphorylation and nuclear translocation of GSK3β to limit DNA damage. Pharmacological or genetic inhibition of GSK3β rescues Gimap5-deficient CD4+ T cells and ameliorates immunopathology in mice. A human patient with GIMAP5 loss-of-function shows lymphopenia and impaired T cell proliferation rescued by GSK3 inhibitors.\",\n      \"method\": \"KO mice, phospho-GSK3β/c-Myc/NFATc1 immunoblot and nuclear import assays, pharmacological GSK3β inhibition, conditional genetic GSK3β targeting, in vitro proliferation assays with human patient cells, rescue experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (biochemical, genetic, pharmacological) in both mouse and human models, with rescue experiments; single lab but highly rigorous\",\n      \"pmids\": [\"29382851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Gimap5 deficiency causes increased DNA damage in CD4+ T cells particularly under TH1-polarizing conditions. TGF-β can control DNA damage in Gimap5-deficient cells, thereby promoting TH17 polarization as a selective survival mechanism.\",\n      \"method\": \"T cell polarization assays, DNA damage quantification (γH2AX), TGF-β treatment, conditional Gimap5fl/flCd4Cre/ert2 mice, human GIMAP5 LOF patient cells\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic link between DNA damage and TH17 bias with pharmacological rescue; single lab\",\n      \"pmids\": [\"30616774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GIMAP5 is expressed in hepatic endothelial cells; its loss (in humans via homozygous damaging mutations and in mice via knockout) results in capillarization of liver sinusoidal endothelial cells (LSECs). Endothelial cell-selective deletion of GIMAP5 reproduces this phenotype. Single-cell RNA-seq places GIMAP5 upstream of GATA4, a transcription factor required for LSEC specification.\",\n      \"method\": \"Human genetic analysis (homozygous mutation identification), mouse KO, endothelial cell-selective conditional KO, single-cell RNA-sequencing, histology/immunofluorescence for LSEC markers\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetics corroborated by mouse KO and endothelial-selective conditional KO; scRNA-seq pathway placement; multiple orthogonal approaches\",\n      \"pmids\": [\"33956074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Gimap5 interacts with M6PR (mannose-6-phosphate receptor) and promotes M6PR translocation from cytoplasm to the cell membrane, thereby inhibiting PADI4-mediated EMT in lung cancer cell lines.\",\n      \"method\": \"Co-IP combined with mass spectrometry, overexpression in lung cancer cell lines, immunofluorescence for M6PR distribution, migration/invasion/proliferation assays\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP/MS with partial follow-up in non-immune cancer cell lines; single lab\",\n      \"pmids\": [\"34604035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MFSD1 and GLMP associate with GIMAP5 in a protein complex. MFSD1 and GLMP interactions with GIMAP5 are essential to maintain normal GIMAP5 expression levels, which in turn support lymphocyte development and liver homeostasis.\",\n      \"method\": \"Proteomic analysis (MS) of MFSD1 interactome, ENU alleles + germline KO of Mfsd1/Glmp/Gimap5, immunoblotting for GIMAP5 protein levels, flow cytometry for lymphocyte populations\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic interaction discovery validated by triple KO genetics showing GIMAP5 protein loss; single lab\",\n      \"pmids\": [\"38055739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Gimap5 promotes RSV degradation in lysosomes by interacting with M6PR and prevents RSV invasion by downregulating expression of the RSV surface receptor IGF1R.\",\n      \"method\": \"Co-IP, Western blot, immunofluorescence, transmission electron microscopy of RSV degradation in Gimap5-overexpressed or -silenced cell lines\",\n      \"journal\": \"Journal of medical virology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single Co-IP with TEM; no mutagenesis or reconstitution\",\n      \"pmids\": [\"36484389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GIMAP5 restricts pathological accumulation of long-chain ceramides (CERs) by interacting with protein kinase CK2 and attenuating CK2's ability to activate ceramide synthases. Inhibition of CK2 or ceramide synthase rescues GIMAP5-deficient T cells from CER overaccumulation and cell deterioration.\",\n      \"method\": \"Co-IP (GIMAP5-CK2 interaction), lipidomic profiling, CK2 and ceramide synthase pharmacological inhibition, functional rescue of GIMAP5-deficient T cells, human genetic disease characterization\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical interaction, lipidomics, pharmacological rescue, human genetics all converging on a single mechanism; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"38172257\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GIMAP5 is a small GTPase localized primarily to lysosomes/multivesicular bodies in lymphoid cells that promotes T lymphocyte and hematopoietic progenitor survival through several converging mechanisms: it maintains ER homeostasis (preventing CHOP-mediated apoptosis), facilitates mitochondrial Ca2+ buffering, supports inactivation of GSK3β (enabling c-Myc induction, NFATc1 nuclear import, and DNA damage control) after T cell activation, restrains mTOR/PI3K pathway hyperactivation, and restricts pathological long-chain ceramide accumulation by interacting with protein kinase CK2 to attenuate ceramide synthase activity; additionally, GIMAP5 interacts with Bcl-2 family proteins (including Mcl-1 via HSC70), is stabilized by a lysosomal complex with MFSD1 and GLMP, and is required in hepatic endothelial cells for liver sinusoidal endothelial cell specification upstream of GATA4.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GIMAP5 is a small GTP-binding protein required for the survival and homeostasis of T lymphocytes and hematopoietic progenitors, established by genetic complementation that rescued T cell lymphopenia in mutant rats [#1] and by knockout models showing impaired intrathymic maturation and post-thymic survival of T cells [#4]. Endogenous GIMAP5 localizes to lysosomes and multivesicular bodies in lymphoid cells across rat, mouse, and human systems [#8], and its expression is stabilized by association with the lysosomal MFSD1/GLMP complex, loss of which depletes GIMAP5 and impairs lymphocyte development and liver homeostasis [#20]. GIMAP5 supports lymphocyte survival through several converging mechanisms: it maintains ER homeostasis to prevent CHOP-mediated apoptosis [#6], promotes mitochondrial Ca2+ buffering in a microtubule-dependent manner [#11], and binds antiapoptotic Bcl-2 family proteins, stabilizing Mcl-1 via HSC70 to preserve mitochondrial integrity in progenitors [#9]. Upon T cell activation, GIMAP5 is required for inactivation of GSK3\\u03b2, thereby enabling c-Myc induction, NFATc1 nuclear import, and control of DNA damage to permit proliferation; GSK3 inhibition rescues GIMAP5-deficient mouse and human patient T cells [#16], and GIMAP5 loss also drives constitutive mTOR/PI3K activation [#13]. GIMAP5 further restricts pathological long-chain ceramide accumulation by interacting with protein kinase CK2 and attenuating ceramide synthase activation [#22]. Beyond the immune system, GIMAP5 is required cell-intrinsically in hepatic endothelial cells for liver sinusoidal endothelial specification upstream of GATA4 [#18]. Human loss-of-function mutations cause lymphopenia with impaired T cell proliferation [#16, #22].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Before its physiological role was known, GIMAP5 was found to act as an antiapoptotic factor, raising the question of how it protects cells from death.\",\n      \"evidence\": \"Overexpression and deletion mutagenesis in Jurkat cells with caspase-3 and CaMKII-inhibitor epistasis\",\n      \"pmids\": [\"12925764\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Localization assigned to centrosome/Golgi/ER conflicts with later lysosomal data\", \"Overexpression-based; no endogenous loss-of-function\", \"Antiapoptotic domain mapping not linked to a defined biochemical activity\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Genetic complementation established that GIMAP5 is directly and specifically required for maintaining peripheral T cell numbers, moving it from correlation to causation.\",\n      \"evidence\": \"PAC transgene rescue of T cell lymphopenia in F344.lyp/lyp rats\",\n      \"pmids\": [\"15328390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not reveal the molecular mechanism of survival support\", \"Whole-organism rescue does not localize the cell-intrinsic requirement\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Conditional knockout in mice defined the cellular phenotype, showing GIMAP5 is required across T, NK, and NKT lineages with a cell-extrinsic component for NK/NKT rescue.\",\n      \"evidence\": \"Conditional gene knockout and bone marrow transfer with flow cytometry\",\n      \"pmids\": [\"18796632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nature of the cell-extrinsic NK/NKT signal not identified\", \"Biochemical basis of survival defect unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"ER stress signaling through CHOP was identified as a downstream effector of GIMAP5 loss, linking the protein to maintenance of ER homeostasis.\",\n      \"evidence\": \"ER chaperone immunoblotting and CHOP siRNA epistasis in Gimap5-deficient rat T cells\",\n      \"pmids\": [\"19424493\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How GIMAP5 prevents ER stress mechanistically unclear\", \"Relationship to mitochondrial and Ca2+ defects not integrated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"GIMAP5 was tied to mitochondrial integrity by showing it binds Bcl-2 family proteins and stabilizes Mcl-1 via HSC70 in hematopoietic progenitors.\",\n      \"evidence\": \"Co-immunoprecipitation, apoptosis assays, and bone marrow repopulation\",\n      \"pmids\": [\"21502331\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect nature of Bcl-2 family binding not resolved\", \"Co-IP without reciprocal structural validation\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Two studies refined GIMAP5's role in Ca2+/mitochondrial physiology and its functional cooperation with the paralog Gimap3.\",\n      \"evidence\": \"Ca2+ imaging with microtubule disruption in HEK-293 and T cells; double-knockout genetic epistasis and transplantation\",\n      \"pmids\": [\"23098229\", \"24510501\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling GIMAP5 to mitochondrial Ca2+ uptake undefined\", \"Whether GIMAP5/GIMAP3 act in a shared complex unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"A P-loop missense mutation showed GIMAP5 is required cell-intrinsically for lymphocyte quiescence and antigen-receptor-driven proliferation, independent of canonical activation signaling.\",\n      \"evidence\": \"ENU mutagenesis, fetal liver chimeras, proliferation and signaling pathway analysis\",\n      \"pmids\": [\"20190135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why proliferation fails despite normal NF-\\u03baB/MAPK/Akt unexplained at this stage\", \"GTPase activity of the P-loop not biochemically characterized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"GIMAP5 was placed in a defined signaling axis: it enables GSK3\\u03b2 inactivation after activation, permitting c-Myc induction, NFATc1 nuclear import, and DNA damage control, explaining the proliferation defect and offering a therapeutic handle.\",\n      \"evidence\": \"KO mice, phospho-GSK3\\u03b2/c-Myc/NFATc1 assays, GSK3 inhibition and rescue including human patient cells\",\n      \"pmids\": [\"29382851\", \"30616774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a lysosomal GTPase controls GSK3\\u03b2 phosphorylation mechanistically unclear\", \"Connection between GSK3\\u03b2 axis and TH17 bias via DNA damage incompletely defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Proteomics identified the lysosomal MFSD1/GLMP complex as required to maintain GIMAP5 protein levels, explaining its stability and lysosomal residence.\",\n      \"evidence\": \"MFSD1 interactome MS and triple KO genetics with GIMAP5 immunoblotting\",\n      \"pmids\": [\"38055739\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the complex confers a transport or scaffolding function unknown\", \"Structural organization of the GIMAP5/MFSD1/GLMP complex undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"GIMAP5 was shown to restrict pathological long-chain ceramide accumulation by binding CK2 and attenuating ceramide synthase activation, providing a lipid-metabolic mechanism linked to human disease.\",\n      \"evidence\": \"Co-IP, lipidomics, CK2/ceramide synthase inhibition with functional rescue and human genetics\",\n      \"pmids\": [\"38172257\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a lysosomal GTPase regulates CK2 toward ceramide synthases unresolved\", \"Integration of ceramide pathway with GSK3\\u03b2 and ER stress mechanisms not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"GIMAP5 was shown to function outside the immune system as a cell-intrinsic requirement for liver sinusoidal endothelial cell specification upstream of GATA4.\",\n      \"evidence\": \"Human genetics, mouse and endothelial-selective KO, single-cell RNA-seq, LSEC marker histology\",\n      \"pmids\": [\"33956074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which GIMAP5 acts upstream of GATA4 unknown\", \"Whether lysosomal/survival functions underlie the LSEC role unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how a single lysosome-associated GTPase mechanistically integrates its diverse reported outputs\\u2014ER stress, mitochondrial Ca2+, Bcl-2 family stabilization, GSK3\\u03b2 inactivation, mTOR restraint, and CK2/ceramide control\\u2014and whether these reflect one primary biochemical activity with downstream consequences.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No defined enzymatic substrate or GTPase-cycle mechanism\", \"No structural model of GIMAP5 or its complexes\", \"Causal hierarchy among the multiple proposed pathways unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [9, 12, 22]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [9, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [8, 14]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 7, 16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [6, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [13, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"complexes\": [\n      \"GIMAP5-MFSD1-GLMP lysosomal complex\"\n    ],\n    \"partners\": [\n      \"MFSD1\",\n      \"GLMP\",\n      \"MCL1\",\n      \"HSPA8\",\n      \"GIMAP3\",\n      \"CSNK2A1\",\n      \"M6PR\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}