{"gene":"GOLGA3","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1997,"finding":"GCP170/GOLGA3 is a peripheral Golgi membrane protein with a long coiled-coil domain predicted to form a globular head, stalk, and tail structure; it associates with the Golgi membrane in phosphorylated and unphosphorylated forms, with the unphosphorylated form more tightly associated, and is dissociated from Golgi membranes by brefeldin A.","method":"Immunocytochemistry, biochemical fractionation, Triton X-100 extraction, phosphorylation analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical methods in a single lab establishing structural and membrane-association properties","pmids":["9295333"],"is_preprint":false},{"year":1999,"finding":"Disruption of the Golga3/Mea2 gene in transgenic mice causes a defect in spermatogenesis in homozygotes, establishing GOLGA3 as required for male fertility in vivo.","method":"Transgenic mouse model, Southern blot, Northern blot, FISH mapping","journal":"Mammalian genome","confidence":"Medium","confidence_rationale":"Tier 2 — genetic loss-of-function in mouse with defined spermatogenesis phenotype","pmids":["9892724"],"is_preprint":false},{"year":2002,"finding":"A truncated Golga3/Mea2 protein (DeltaMea2) localized to the Golgi apparatus of pachytene spermatocytes and round spermatids is sufficient to restore spermatogenesis when expressed at sufficient levels, demonstrating that GOLGA3 function in pachytene spermatocyte survival is dose-dependent.","method":"Transgenic rescue experiment, immunolocalization, fertility assay","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 2 — genetic rescue experiment with defined functional readout","pmids":["11835574"],"is_preprint":false},{"year":2002,"finding":"The N-terminal head domain (residues 172–257) of golgin-160 contains Golgi targeting information sufficient to localize to the Golgi independently; caspase cleavage fragments of this head domain can expose a cryptic nuclear localization signal, leading to nuclear accumulation.","method":"GFP-tagged deletion constructs, fluorescence microscopy, caspase cleavage fragment localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple deletion constructs with systematic mapping and functional readout replicated across constructs","pmids":["12130652"],"is_preprint":false},{"year":2003,"finding":"GCP16, a novel protein identified by yeast two-hybrid screening using GCP170/GOLGA3's Golgi localization domain as bait, interacts with GCP170 and co-localizes with it at the Golgi; GCP16 is palmitoylated at Cys69 and Cys72, and this acylation is required for its Golgi localization.","method":"Yeast two-hybrid, immunofluorescence co-localization, [3H]palmitic acid labeling, mutagenesis (C69A/C72A)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — interaction identified by Y2H, confirmed by co-localization, mechanism established by radiolabeling and mutagenesis","pmids":["14522980"],"is_preprint":false},{"year":2004,"finding":"Mixed lineage kinase 3 (MLK3) directly phosphorylates golgin-160 in its N-terminal head domain (residues 96–259); MLK3 co-immunoprecipitates with golgin-160 and their intracellular distributions overlap; MLK3 overexpression enhances caspase-dependent cleavage of golgin-160 at Asp139.","method":"Co-immunoprecipitation, in vitro kinase assay, overexpression, immunofluorescence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay plus co-IP and functional consequence (enhanced caspase cleavage)","pmids":["14734651"],"is_preprint":false},{"year":2005,"finding":"Golgin-160 interacts with the PDZ domain protein PIST via a leucine-rich repeat in golgin-160 and an internal coiled-coil domain in PIST; they co-localize at Golgi membranes. A second isoform, golgin-160B, lacks the leucine repeat exon and cannot bind PIST.","method":"Yeast two-hybrid, GST pull-down, in vivo co-localization, isoform characterization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — interaction mapped by Y2H and GST pull-down with domain-level resolution, confirmed in vivo, supported by natural isoform lacking binding domain","pmids":["15951434"],"is_preprint":false},{"year":2005,"finding":"Caspase-resistant golgin-160 dominantly blocks initiator caspase activation and confers resistance to apoptosis induced by death receptor ligation and ER stress (brefeldin A, DTT, thapsigargin), but not to staurosporine or anisomycin, establishing golgin-160 as a component of apoptotic signal transduction at Golgi membranes for specific stimuli.","method":"Stable cell lines expressing caspase-resistant mutant, cell viability assays, caspase activation assays, multiple proapoptotic stimuli","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — clean genetic tool (caspase-resistant mutant) with multiple stimuli and mechanistic readout (initiator caspase activation)","pmids":["15829563"],"is_preprint":false},{"year":2006,"finding":"GCP60 preferentially interacts with the caspase-generated golgin-160 fragment (residues 140–311) over the intact head domain; this interaction retains the fragment at the Golgi and prevents its nuclear translocation.","method":"Yeast two-hybrid, co-immunoprecipitation, cellular localization assays, overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — interaction identified by Y2H and confirmed by co-IP; functional consequence (nuclear retention) demonstrated by localization assay","pmids":["16870622"],"is_preprint":false},{"year":2006,"finding":"Golgin-160 is required for Golgi membrane sorting of GLUT4 and IRAP in adipocytes; siRNA-mediated depletion increases basal plasma membrane GLUT4 via enhanced exocytosis through a TGN/Golgi sorting-independent pathway; the C-terminal coiled-coil region (393–1498) of golgin-160 inhibits insulin-stimulated GLUT4 translocation.","method":"siRNA knockdown, rescue with siRNA-resistant cDNA, plasma membrane fractionation, glucose uptake assay, dominant-interfering mutant","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — siRNA with domain-specific rescue, multiple orthogonal assays (exocytosis rate, WGA binding, dominant-interfering GGA mutant)","pmids":["17050738"],"is_preprint":false},{"year":2006,"finding":"Golgin-160 promotes cell surface expression of the beta-1 adrenergic receptor (beta1AR); depletion by RNAi reduces surface beta1AR levels, rescued by RNAi-resistant golgin-160; golgin-160 interacts directly with beta1AR in vitro, mapped to residues 140–257 of golgin-160 head and the third intracellular loop of beta1AR; golgin-160 localizes to cis/medial Golgi by immunoelectron microscopy.","method":"RNAi, rescue expression, in vitro binding assay, immunoelectron microscopy, flow cytometry","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 1–2 — direct in vitro interaction with domain mapping, RNAi phenotype with rescue, structural localization by immuno-EM","pmids":["17118120"],"is_preprint":false},{"year":2006,"finding":"Golgin-160 interacts with the ROMK potassium channel C-terminus (identified by yeast two-hybrid and co-immunoprecipitation), co-localizes with ROMK in the Golgi, and increases ROMK cell surface density and current amplitude when co-expressed in Xenopus oocytes.","method":"Yeast two-hybrid, co-immunoprecipitation, immunofluorescence, electrophysiology in Xenopus oocytes","journal":"Cellular physiology and biochemistry","confidence":"High","confidence_rationale":"Tier 1–2 — interaction confirmed by Y2H and co-IP, functional consequence demonstrated by electrophysiology and surface density measurement","pmids":["16543716"],"is_preprint":false},{"year":2007,"finding":"A single redox-sensitive cysteine (Cys-463) in GCP60 is critical for its interaction with the golgin-160 caspase fragment (140–311); in reduced form the interaction is abolished, while oxidation by H2O2 or a nitric oxide donor restores it, regulating nuclear translocation of the golgin-160 fragment.","method":"In vitro binding assay, mutagenesis, redox manipulation (H2O2, NO donor), cellular localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis plus chemical manipulation with functional readout (nuclear translocation), mechanistically precise","pmids":["17711851"],"is_preprint":false},{"year":2013,"finding":"A nonsense mutation in exon 18 of Golga3 (repro27) abolishes GOLGA3 protein expression and causes fully penetrant male infertility in mice; spermatogenesis is disrupted in late meiosis with elevated apoptosis (TUNEL+) by 12 dpp, and surviving round spermatids show defects in acrosome formation, head and tail development.","method":"ENU-induced point mutation mouse model, TUNEL assay, histology, CASA, IVF","journal":"Andrology","confidence":"High","confidence_rationale":"Tier 2 — clean loss-of-function allele with multiple defined cellular phenotypes","pmids":["23495255"],"is_preprint":false},{"year":2014,"finding":"Three basic residues in the third intracellular loop of beta1AR are required for golgin-160-dependent trafficking to the plasma membrane; mutation of these residues does not affect ER-to-Golgi transit but reduces steady-state plasma membrane levels, suggesting golgin-160 promotes incorporation of beta1AR into post-Golgi transport carriers at the TGN.","method":"Site-directed mutagenesis, cell surface assay, pulse-chase trafficking assay","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis with compartment-specific trafficking readout, single lab","pmids":["24566136"],"is_preprint":false},{"year":2019,"finding":"Knockdown of golgin-160 using lentiviral shRNA reduces the migration and invasion of U251 glioma cells and causes Golgi fragmentation and reduced Golgi size; GDNF treatment reverses these effects by enlarging and repositioning the Golgi apparatus.","method":"Lentiviral shRNA knockdown, transwell migration/invasion assay, Golgi morphology by fluorescence","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 — knockdown with cellular phenotype (migration/invasion) but limited mechanistic depth","pmids":["30695072"],"is_preprint":false},{"year":2023,"finding":"S461 is a phosphorylation site on GOLGA3; the S461L mutation reduces Golgi localization of GOLGA3 (some protein scattered in cytoplasm), but Golga3 S461L/S461L knock-in mice have normal spermatogenesis and fertility, indicating this specific phosphorylation site is dispensable for spermatogenesis.","method":"Immunofluorescence co-localization, protein dephosphorylation assay, cytosine base editor knock-in mouse, histology, TUNEL, CASA","journal":"PeerJ","confidence":"Medium","confidence_rationale":"Tier 2 — phosphorylation site confirmed biochemically, functional consequence assessed in vivo with multiple readouts","pmids":["37090114"],"is_preprint":false},{"year":2024,"finding":"Golgin-160 knockout causes Golgi fragmentation and vesicle build-up; loss of golgin-160 impairs extracellular matrix (ECM) secretion and glycosaminoglycan synthesis, establishing a role for golgin-160 in ECM secretion.","method":"Knockout cell line, Golgi morphology imaging, proteomics/secretome analysis, glycosaminoglycan synthesis assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — knockout with defined morphological and secretory phenotypes, preprint not yet peer-reviewed","pmids":["bio_10.1101_2024.11.19.624265"],"is_preprint":true}],"current_model":"GOLGA3/golgin-160 is a peripheral Golgi membrane protein (cis/medial cisternae) with a coiled-coil stalk and a non-coiled-coil head domain (residues 172–257) that contains Golgi targeting information, a cryptic nuclear localization signal, and caspase cleavage sites; it is phosphorylated by MLK3, interacts with cargo proteins (beta1AR, GLUT4/IRAP, ROMK) and Golgi regulators (PIST, GCP60) to promote selective post-Golgi trafficking to the plasma membrane, participates in apoptotic signal transduction at the Golgi (where cleavage by caspases releases fragments that translocate to the nucleus in a GCP60/redox-regulated manner), and is required in vivo for pachytene spermatocyte survival and normal spermatogenesis as well as for ECM secretion."},"narrative":{"teleology":[{"year":1997,"claim":"Establishing GOLGA3 as a peripheral Golgi protein with a coiled-coil architecture whose membrane association is regulated by phosphorylation answered the basic question of where and how this protein is organized at the Golgi.","evidence":"Immunocytochemistry, biochemical fractionation, and phosphorylation analysis of GCP170 in cultured cells","pmids":["9295333"],"confidence":"Medium","gaps":["Identity of the kinase(s) and phosphatase(s) regulating membrane association unknown","Mechanism of BFA-induced dissociation not resolved"]},{"year":1999,"claim":"Genetic disruption of Golga3 in mice revealed an unexpected in vivo requirement for spermatogenesis, linking a Golgi structural protein to male fertility.","evidence":"Transgenic mouse knockout of Golga3/Mea2 with spermatogenesis phenotype","pmids":["9892724"],"confidence":"Medium","gaps":["Cellular basis of spermatogenesis failure not defined","Whether GOLGA3 function in germ cells involves trafficking or structural roles unclear"]},{"year":2002,"claim":"Transgenic rescue and domain-mapping experiments established that a truncated GOLGA3 protein localized to the Golgi is sufficient for spermatocyte survival in a dose-dependent manner, and that the N-terminal head domain (residues 172–257) autonomously targets to the Golgi while harboring a cryptic NLS exposed upon caspase cleavage.","evidence":"Transgenic rescue in mice; GFP-tagged deletion constructs with caspase fragment localization in cultured cells","pmids":["11835574","12130652"],"confidence":"High","gaps":["Structural basis of Golgi targeting within the head domain not determined","Identity of nuclear functions of caspase fragment unknown"]},{"year":2003,"claim":"Identification of GCP16 as a palmitoylated Golgi-localized binding partner of GOLGA3 revealed a lipid-modified accessory factor that could anchor GOLGA3 complexes at the membrane.","evidence":"Yeast two-hybrid screen using GOLGA3 Golgi-localization domain, confirmed by co-localization and palmitate labeling with C69A/C72A mutagenesis","pmids":["14522980"],"confidence":"High","gaps":["Functional consequence of GCP16–GOLGA3 interaction for trafficking not tested","Whether GCP16 palmitoylation recruits GOLGA3 or vice versa unresolved"]},{"year":2004,"claim":"MLK3 was identified as a kinase that directly phosphorylates the golgin-160 head domain and enhances its caspase cleavage, linking upstream kinase signaling to apoptotic processing of GOLGA3.","evidence":"In vitro kinase assay, co-immunoprecipitation, and caspase cleavage enhancement upon MLK3 overexpression","pmids":["14734651"],"confidence":"High","gaps":["Specific phosphorylation sites within the head domain not mapped","Physiological stimuli activating MLK3-dependent GOLGA3 cleavage not identified"]},{"year":2005,"claim":"Demonstration that caspase-resistant golgin-160 blocks initiator caspase activation downstream of death receptors and ER stress—but not staurosporine—established GOLGA3 as a stimulus-selective mediator of Golgi-localized apoptotic signaling.","evidence":"Stable cell lines expressing caspase-resistant mutant tested with multiple proapoptotic stimuli, measuring caspase activation and viability","pmids":["15829563"],"confidence":"High","gaps":["Mechanism by which intact golgin-160 promotes initiator caspase activation unknown","Whether GOLGA3 cleavage fragments have direct pro-apoptotic activity in the nucleus untested"]},{"year":2005,"claim":"PIST was identified as a PDZ-domain partner of golgin-160 that binds via a leucine-rich repeat, with a naturally occurring splice isoform (golgin-160B) lacking this interaction, suggesting isoform-specific regulation of Golgi sorting.","evidence":"Yeast two-hybrid and GST pull-down with domain mapping; characterization of golgin-160B isoform","pmids":["15951434"],"confidence":"High","gaps":["Cargo specificity conferred by the golgin-160–PIST interaction not defined","Tissue distribution and functional divergence of the two isoforms not established"]},{"year":2006,"claim":"A series of studies demonstrated that golgin-160 functions as a cargo-selective Golgi sorting adaptor: it directly binds and promotes plasma membrane delivery of beta1AR (via residues 140–257), regulates Golgi sorting of GLUT4/IRAP in adipocytes, and enhances surface density and current of the ROMK channel, while GCP60 retains golgin-160 caspase fragments at the Golgi to prevent nuclear translocation.","evidence":"RNAi with rescue, in vitro binding, immuno-EM localization (beta1AR); siRNA knockdown with exocytosis assays (GLUT4); Y2H, co-IP, and electrophysiology in Xenopus oocytes (ROMK); Y2H and co-IP with localization assays (GCP60)","pmids":["17118120","17050738","16543716","16870622"],"confidence":"High","gaps":["General versus cargo-specific sorting mechanism not distinguished","How golgin-160 recognizes structurally diverse cargo cytoplasmic tails not resolved","Whether GLUT4 and beta1AR sorting share the same golgin-160 domain unknown"]},{"year":2007,"claim":"A redox-sensing mechanism was identified in which oxidation of GCP60 Cys-463 controls its binding to the golgin-160 caspase fragment, thereby gating nuclear translocation of this fragment in response to oxidative or nitrosative stress.","evidence":"In vitro binding with C463 mutagenesis, H2O2/NO donor treatment, cellular localization","pmids":["17711851"],"confidence":"High","gaps":["Physiological redox conditions that trigger this switch in vivo not defined","Nuclear target(s) of the golgin-160 fragment remain unidentified"]},{"year":2013,"claim":"An ENU-induced nonsense mutation (repro27) confirmed that complete GOLGA3 loss causes male-specific infertility with elevated apoptosis in late meiosis and downstream defects in acrosome biogenesis, head shaping, and tail development.","evidence":"ENU point mutation mouse model with TUNEL, histology, CASA, IVF","pmids":["23495255"],"confidence":"High","gaps":["Whether spermatocyte death results from trafficking failure or apoptotic signaling defect not distinguished","Female reproductive function and somatic phenotypes not fully characterized"]},{"year":2014,"claim":"Identification of three basic residues in beta1AR's third intracellular loop as essential for golgin-160-dependent surface delivery—without affecting ER-to-Golgi transit—refined the model that golgin-160 acts at the TGN to load cargo into post-Golgi carriers.","evidence":"Site-directed mutagenesis with compartment-specific trafficking assays","pmids":["24566136"],"confidence":"Medium","gaps":["Direct demonstration that golgin-160 acts at the TGN rather than cis-Golgi for this function lacking","Structural basis of the charge-dependent recognition not determined"]},{"year":2023,"claim":"Phosphorylation at S461 was confirmed biochemically but shown to be dispensable for spermatogenesis in knock-in mice, constraining models of phospho-regulation of GOLGA3 in vivo.","evidence":"Cytosine base editor S461L knock-in mouse with histology, TUNEL, CASA","pmids":["37090114"],"confidence":"Medium","gaps":["Other phosphorylation sites (including MLK3 targets) not tested in vivo","Whether S461 phosphorylation affects non-germ-cell functions untested"]},{"year":null,"claim":"Key unresolved questions include: the identity and function of nuclear targets of the golgin-160 caspase fragment, the structural basis by which a single head domain recognizes diverse cargo cytoplasmic tails, whether the trafficking and apoptotic functions are mechanistically linked in spermatocytes, and the full spectrum of GOLGA3-dependent cargo in somatic tissues.","evidence":"","pmids":[],"confidence":"Low","gaps":["Nuclear function of caspase-generated fragments undefined","No structural model of head-domain–cargo interaction exists","Relationship between trafficking and apoptotic roles in spermatogenesis unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[9,10,11,14]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[10,11]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,3,4,10,16]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,8,12]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[9,10,11,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5,7,8,12,13]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[9,10,11]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[1,2,13]}],"complexes":[],"partners":["GCP16","PIST","GCP60","MLK3","ADRB1","SLC2A4","KCNJ1"],"other_free_text":[]},"mechanistic_narrative":"GOLGA3 (golgin-160) is a peripheral Golgi membrane protein that functions as a cargo-selective sorting adaptor at the cis/medial Golgi and trans-Golgi network, promoting post-Golgi trafficking of specific transmembrane cargoes—including beta-1 adrenergic receptor, GLUT4/IRAP, and the ROMK potassium channel—to the plasma membrane [PMID:17118120, PMID:17050738, PMID:16543716]. Its N-terminal head domain (residues 172–257) contains Golgi targeting information and directly binds cargo intracellular domains, while its coiled-coil stalk mediates interactions with Golgi regulators such as GCP16, PIST, and GCP60 [PMID:12130652, PMID:14522980, PMID:15951434, PMID:16870622]. GOLGA3 participates in apoptotic signaling at the Golgi: caspase cleavage within the head domain releases fragments that expose a cryptic nuclear localization signal, with nuclear translocation regulated by GCP60 binding in a redox-sensitive manner, and a caspase-resistant mutant blocks initiator caspase activation downstream of death receptors and ER stress [PMID:15829563, PMID:17711851]. Loss of GOLGA3 in mice causes fully penetrant male infertility due to pachytene spermatocyte apoptosis and defective acrosome formation, establishing an essential in vivo requirement for spermatogenesis [PMID:9892724, PMID:23495255]."},"prefetch_data":{"uniprot":{"accession":"Q08378","full_name":"Golgin subfamily A member 3","aliases":["Golgi complex-associated protein of 170 kDa","GCP170","Golgin-160"],"length_aa":1498,"mass_kda":167.4,"function":"Golgi auto-antigen; probably involved in maintaining Golgi structure","subcellular_location":"Cytoplasm; Golgi apparatus, Golgi stack membrane","url":"https://www.uniprot.org/uniprotkb/Q08378/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GOLGA3","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GOLGA3","total_profiled":1310},"omim":[{"mim_id":"616180","title":"GOLGIN A8 FAMILY, MEMBER A; GOLGA8A","url":"https://www.omim.org/entry/616180"},{"mim_id":"609453","title":"GOLGIN A7; GOLGA7","url":"https://www.omim.org/entry/609453"},{"mim_id":"602581","title":"GOLGIN A3; GOLGA3","url":"https://www.omim.org/entry/602581"},{"mim_id":"602580","title":"GOLGIN A2; GOLGA2","url":"https://www.omim.org/entry/602580"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GOLGA3"},"hgnc":{"alias_symbol":["golgin-160","GCP170","MEA-2"],"prev_symbol":[]},"alphafold":{"accession":"Q08378","domains":[{"cath_id":"1.20.5","chopping":"835-955","consensus_level":"medium","plddt":87.9846,"start":835,"end":955}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q08378","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q08378-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q08378-F1-predicted_aligned_error_v6.png","plddt_mean":67.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GOLGA3","jax_strain_url":"https://www.jax.org/strain/search?query=GOLGA3"},"sequence":{"accession":"Q08378","fasta_url":"https://rest.uniprot.org/uniprotkb/Q08378.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q08378/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q08378"}},"corpus_meta":[{"pmid":"12130652","id":"PMC_12130652","title":"The NH2-terminal domain of Golgin-160 contains both Golgi and nuclear targeting information.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12130652","citation_count":66,"is_preprint":false},{"pmid":"15829563","id":"PMC_15829563","title":"Caspase-resistant Golgin-160 disrupts apoptosis induced by secretory pathway stress and ligation of death receptors.","date":"2005","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/15829563","citation_count":54,"is_preprint":false},{"pmid":"17050738","id":"PMC_17050738","title":"Golgin-160 is required for the Golgi membrane sorting of the insulin-responsive glucose transporter GLUT4 in adipocytes.","date":"2006","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/17050738","citation_count":53,"is_preprint":false},{"pmid":"14522980","id":"PMC_14522980","title":"Identification and characterization of GCP16, a novel acylated Golgi protein that interacts with GCP170.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14522980","citation_count":46,"is_preprint":false},{"pmid":"17118120","id":"PMC_17118120","title":"Golgin-160 promotes cell surface expression of the beta-1 adrenergic receptor.","date":"2006","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/17118120","citation_count":44,"is_preprint":false},{"pmid":"9295333","id":"PMC_9295333","title":"Molecular characterization of GCP170, a 170-kDa protein associated with the cytoplasmic face of the Golgi membrane.","date":"1997","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9295333","citation_count":43,"is_preprint":false},{"pmid":"16870622","id":"PMC_16870622","title":"GCP60 preferentially interacts with a caspase-generated golgin-160 fragment.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16870622","citation_count":40,"is_preprint":false},{"pmid":"15951434","id":"PMC_15951434","title":"Isoform-specific interaction of golgin-160 with the Golgi-associated protein PIST.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15951434","citation_count":39,"is_preprint":false},{"pmid":"14734651","id":"PMC_14734651","title":"Phosphorylation of golgin-160 by mixed lineage kinase 3.","date":"2004","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/14734651","citation_count":26,"is_preprint":false},{"pmid":"9892724","id":"PMC_9892724","title":"Mea2/Golga3 gene is disrupted in a line of transgenic mice with a reciprocal translocation between Chromosomes 5 and 19 and is responsible for a defective spermatogenesis in homozygotes.","date":"1999","source":"Mammalian genome : official journal of the International Mammalian Genome Society","url":"https://pubmed.ncbi.nlm.nih.gov/9892724","citation_count":22,"is_preprint":false},{"pmid":"23495255","id":"PMC_23495255","title":"New point mutation in Golga3 causes multiple defects in spermatogenesis.","date":"2013","source":"Andrology","url":"https://pubmed.ncbi.nlm.nih.gov/23495255","citation_count":21,"is_preprint":false},{"pmid":"16543716","id":"PMC_16543716","title":"Involvement of Golgin-160 in cell surface transport of renal ROMK channel: co-expression of Golgin-160 increases ROMK currents.","date":"2006","source":"Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/16543716","citation_count":21,"is_preprint":false},{"pmid":"17711851","id":"PMC_17711851","title":"Identification of a redox-sensitive cysteine in GCP60 that regulates its interaction with golgin-160.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17711851","citation_count":19,"is_preprint":false},{"pmid":"11835574","id":"PMC_11835574","title":"Golgi matrix protein gene, Golga3/Mea2, rearranged and re-expressed in pachytene spermatocytes restores spermatogenesis in the mouse.","date":"2002","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/11835574","citation_count":19,"is_preprint":false},{"pmid":"9063644","id":"PMC_9063644","title":"Cloning and molecular characterization of cDNA encoding a mouse male-enhanced antigen-2 (Mea-2): a putative family of the Golgi autoantigen.","date":"1997","source":"DNA sequence : the journal of DNA sequencing and mapping","url":"https://pubmed.ncbi.nlm.nih.gov/9063644","citation_count":14,"is_preprint":false},{"pmid":"30695072","id":"PMC_30695072","title":"Golgin-160 and GMAP210 play an important role in U251 cells migration and invasion initiated by GDNF.","date":"2019","source":"PloS 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spermatogenesis.","date":"2023","source":"PeerJ","url":"https://pubmed.ncbi.nlm.nih.gov/37090114","citation_count":2,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.11.19.624265","title":"Golgins support extracellular matrix secretion by collectively maintaining the Golgi structure-function relationship","date":"2024-11-21","source":"bioRxiv","url":"https://doi.org/10.1101/2024.11.19.624265","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.03.06.641895","title":"ATXN2L primarily interacts with NUFIP2, the absence of ATXN2L results in NUFIP2 depletion, and the ATXN2-polyQ expansion triggers NUFIP2 accumulation","date":"2025-03-11","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.06.641895","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":11305,"output_tokens":4118,"usd":0.047843},"stage2":{"model":"claude-opus-4-6","input_tokens":7597,"output_tokens":3221,"usd":0.177765},"total_usd":0.225608,"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\": 1997,\n      \"finding\": \"GCP170/GOLGA3 is a peripheral Golgi membrane protein with a long coiled-coil domain predicted to form a globular head, stalk, and tail structure; it associates with the Golgi membrane in phosphorylated and unphosphorylated forms, with the unphosphorylated form more tightly associated, and is dissociated from Golgi membranes by brefeldin A.\",\n      \"method\": \"Immunocytochemistry, biochemical fractionation, Triton X-100 extraction, phosphorylation analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical methods in a single lab establishing structural and membrane-association properties\",\n      \"pmids\": [\"9295333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Disruption of the Golga3/Mea2 gene in transgenic mice causes a defect in spermatogenesis in homozygotes, establishing GOLGA3 as required for male fertility in vivo.\",\n      \"method\": \"Transgenic mouse model, Southern blot, Northern blot, FISH mapping\",\n      \"journal\": \"Mammalian genome\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function in mouse with defined spermatogenesis phenotype\",\n      \"pmids\": [\"9892724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A truncated Golga3/Mea2 protein (DeltaMea2) localized to the Golgi apparatus of pachytene spermatocytes and round spermatids is sufficient to restore spermatogenesis when expressed at sufficient levels, demonstrating that GOLGA3 function in pachytene spermatocyte survival is dose-dependent.\",\n      \"method\": \"Transgenic rescue experiment, immunolocalization, fertility assay\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic rescue experiment with defined functional readout\",\n      \"pmids\": [\"11835574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The N-terminal head domain (residues 172–257) of golgin-160 contains Golgi targeting information sufficient to localize to the Golgi independently; caspase cleavage fragments of this head domain can expose a cryptic nuclear localization signal, leading to nuclear accumulation.\",\n      \"method\": \"GFP-tagged deletion constructs, fluorescence microscopy, caspase cleavage fragment localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple deletion constructs with systematic mapping and functional readout replicated across constructs\",\n      \"pmids\": [\"12130652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"GCP16, a novel protein identified by yeast two-hybrid screening using GCP170/GOLGA3's Golgi localization domain as bait, interacts with GCP170 and co-localizes with it at the Golgi; GCP16 is palmitoylated at Cys69 and Cys72, and this acylation is required for its Golgi localization.\",\n      \"method\": \"Yeast two-hybrid, immunofluorescence co-localization, [3H]palmitic acid labeling, mutagenesis (C69A/C72A)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — interaction identified by Y2H, confirmed by co-localization, mechanism established by radiolabeling and mutagenesis\",\n      \"pmids\": [\"14522980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mixed lineage kinase 3 (MLK3) directly phosphorylates golgin-160 in its N-terminal head domain (residues 96–259); MLK3 co-immunoprecipitates with golgin-160 and their intracellular distributions overlap; MLK3 overexpression enhances caspase-dependent cleavage of golgin-160 at Asp139.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, overexpression, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay plus co-IP and functional consequence (enhanced caspase cleavage)\",\n      \"pmids\": [\"14734651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Golgin-160 interacts with the PDZ domain protein PIST via a leucine-rich repeat in golgin-160 and an internal coiled-coil domain in PIST; they co-localize at Golgi membranes. A second isoform, golgin-160B, lacks the leucine repeat exon and cannot bind PIST.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, in vivo co-localization, isoform characterization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — interaction mapped by Y2H and GST pull-down with domain-level resolution, confirmed in vivo, supported by natural isoform lacking binding domain\",\n      \"pmids\": [\"15951434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Caspase-resistant golgin-160 dominantly blocks initiator caspase activation and confers resistance to apoptosis induced by death receptor ligation and ER stress (brefeldin A, DTT, thapsigargin), but not to staurosporine or anisomycin, establishing golgin-160 as a component of apoptotic signal transduction at Golgi membranes for specific stimuli.\",\n      \"method\": \"Stable cell lines expressing caspase-resistant mutant, cell viability assays, caspase activation assays, multiple proapoptotic stimuli\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic tool (caspase-resistant mutant) with multiple stimuli and mechanistic readout (initiator caspase activation)\",\n      \"pmids\": [\"15829563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"GCP60 preferentially interacts with the caspase-generated golgin-160 fragment (residues 140–311) over the intact head domain; this interaction retains the fragment at the Golgi and prevents its nuclear translocation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, cellular localization assays, overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — interaction identified by Y2H and confirmed by co-IP; functional consequence (nuclear retention) demonstrated by localization assay\",\n      \"pmids\": [\"16870622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Golgin-160 is required for Golgi membrane sorting of GLUT4 and IRAP in adipocytes; siRNA-mediated depletion increases basal plasma membrane GLUT4 via enhanced exocytosis through a TGN/Golgi sorting-independent pathway; the C-terminal coiled-coil region (393–1498) of golgin-160 inhibits insulin-stimulated GLUT4 translocation.\",\n      \"method\": \"siRNA knockdown, rescue with siRNA-resistant cDNA, plasma membrane fractionation, glucose uptake assay, dominant-interfering mutant\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA with domain-specific rescue, multiple orthogonal assays (exocytosis rate, WGA binding, dominant-interfering GGA mutant)\",\n      \"pmids\": [\"17050738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Golgin-160 promotes cell surface expression of the beta-1 adrenergic receptor (beta1AR); depletion by RNAi reduces surface beta1AR levels, rescued by RNAi-resistant golgin-160; golgin-160 interacts directly with beta1AR in vitro, mapped to residues 140–257 of golgin-160 head and the third intracellular loop of beta1AR; golgin-160 localizes to cis/medial Golgi by immunoelectron microscopy.\",\n      \"method\": \"RNAi, rescue expression, in vitro binding assay, immunoelectron microscopy, flow cytometry\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct in vitro interaction with domain mapping, RNAi phenotype with rescue, structural localization by immuno-EM\",\n      \"pmids\": [\"17118120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Golgin-160 interacts with the ROMK potassium channel C-terminus (identified by yeast two-hybrid and co-immunoprecipitation), co-localizes with ROMK in the Golgi, and increases ROMK cell surface density and current amplitude when co-expressed in Xenopus oocytes.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, immunofluorescence, electrophysiology in Xenopus oocytes\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — interaction confirmed by Y2H and co-IP, functional consequence demonstrated by electrophysiology and surface density measurement\",\n      \"pmids\": [\"16543716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"A single redox-sensitive cysteine (Cys-463) in GCP60 is critical for its interaction with the golgin-160 caspase fragment (140–311); in reduced form the interaction is abolished, while oxidation by H2O2 or a nitric oxide donor restores it, regulating nuclear translocation of the golgin-160 fragment.\",\n      \"method\": \"In vitro binding assay, mutagenesis, redox manipulation (H2O2, NO donor), cellular localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis plus chemical manipulation with functional readout (nuclear translocation), mechanistically precise\",\n      \"pmids\": [\"17711851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A nonsense mutation in exon 18 of Golga3 (repro27) abolishes GOLGA3 protein expression and causes fully penetrant male infertility in mice; spermatogenesis is disrupted in late meiosis with elevated apoptosis (TUNEL+) by 12 dpp, and surviving round spermatids show defects in acrosome formation, head and tail development.\",\n      \"method\": \"ENU-induced point mutation mouse model, TUNEL assay, histology, CASA, IVF\",\n      \"journal\": \"Andrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function allele with multiple defined cellular phenotypes\",\n      \"pmids\": [\"23495255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Three basic residues in the third intracellular loop of beta1AR are required for golgin-160-dependent trafficking to the plasma membrane; mutation of these residues does not affect ER-to-Golgi transit but reduces steady-state plasma membrane levels, suggesting golgin-160 promotes incorporation of beta1AR into post-Golgi transport carriers at the TGN.\",\n      \"method\": \"Site-directed mutagenesis, cell surface assay, pulse-chase trafficking assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis with compartment-specific trafficking readout, single lab\",\n      \"pmids\": [\"24566136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Knockdown of golgin-160 using lentiviral shRNA reduces the migration and invasion of U251 glioma cells and causes Golgi fragmentation and reduced Golgi size; GDNF treatment reverses these effects by enlarging and repositioning the Golgi apparatus.\",\n      \"method\": \"Lentiviral shRNA knockdown, transwell migration/invasion assay, Golgi morphology by fluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — knockdown with cellular phenotype (migration/invasion) but limited mechanistic depth\",\n      \"pmids\": [\"30695072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"S461 is a phosphorylation site on GOLGA3; the S461L mutation reduces Golgi localization of GOLGA3 (some protein scattered in cytoplasm), but Golga3 S461L/S461L knock-in mice have normal spermatogenesis and fertility, indicating this specific phosphorylation site is dispensable for spermatogenesis.\",\n      \"method\": \"Immunofluorescence co-localization, protein dephosphorylation assay, cytosine base editor knock-in mouse, histology, TUNEL, CASA\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — phosphorylation site confirmed biochemically, functional consequence assessed in vivo with multiple readouts\",\n      \"pmids\": [\"37090114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Golgin-160 knockout causes Golgi fragmentation and vesicle build-up; loss of golgin-160 impairs extracellular matrix (ECM) secretion and glycosaminoglycan synthesis, establishing a role for golgin-160 in ECM secretion.\",\n      \"method\": \"Knockout cell line, Golgi morphology imaging, proteomics/secretome analysis, glycosaminoglycan synthesis assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockout with defined morphological and secretory phenotypes, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.11.19.624265\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"GOLGA3/golgin-160 is a peripheral Golgi membrane protein (cis/medial cisternae) with a coiled-coil stalk and a non-coiled-coil head domain (residues 172–257) that contains Golgi targeting information, a cryptic nuclear localization signal, and caspase cleavage sites; it is phosphorylated by MLK3, interacts with cargo proteins (beta1AR, GLUT4/IRAP, ROMK) and Golgi regulators (PIST, GCP60) to promote selective post-Golgi trafficking to the plasma membrane, participates in apoptotic signal transduction at the Golgi (where cleavage by caspases releases fragments that translocate to the nucleus in a GCP60/redox-regulated manner), and is required in vivo for pachytene spermatocyte survival and normal spermatogenesis as well as for ECM secretion.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GOLGA3 (golgin-160) is a peripheral Golgi membrane protein that functions as a cargo-selective sorting adaptor at the cis/medial Golgi and trans-Golgi network, promoting post-Golgi trafficking of specific transmembrane cargoes—including beta-1 adrenergic receptor, GLUT4/IRAP, and the ROMK potassium channel—to the plasma membrane [PMID:17118120, PMID:17050738, PMID:16543716]. Its N-terminal head domain (residues 172–257) contains Golgi targeting information and directly binds cargo intracellular domains, while its coiled-coil stalk mediates interactions with Golgi regulators such as GCP16, PIST, and GCP60 [PMID:12130652, PMID:14522980, PMID:15951434, PMID:16870622]. GOLGA3 participates in apoptotic signaling at the Golgi: caspase cleavage within the head domain releases fragments that expose a cryptic nuclear localization signal, with nuclear translocation regulated by GCP60 binding in a redox-sensitive manner, and a caspase-resistant mutant blocks initiator caspase activation downstream of death receptors and ER stress [PMID:15829563, PMID:17711851]. Loss of GOLGA3 in mice causes fully penetrant male infertility due to pachytene spermatocyte apoptosis and defective acrosome formation, establishing an essential in vivo requirement for spermatogenesis [PMID:9892724, PMID:23495255].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing GOLGA3 as a peripheral Golgi protein with a coiled-coil architecture whose membrane association is regulated by phosphorylation answered the basic question of where and how this protein is organized at the Golgi.\",\n      \"evidence\": \"Immunocytochemistry, biochemical fractionation, and phosphorylation analysis of GCP170 in cultured cells\",\n      \"pmids\": [\"9295333\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the kinase(s) and phosphatase(s) regulating membrane association unknown\", \"Mechanism of BFA-induced dissociation not resolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Genetic disruption of Golga3 in mice revealed an unexpected in vivo requirement for spermatogenesis, linking a Golgi structural protein to male fertility.\",\n      \"evidence\": \"Transgenic mouse knockout of Golga3/Mea2 with spermatogenesis phenotype\",\n      \"pmids\": [\"9892724\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular basis of spermatogenesis failure not defined\", \"Whether GOLGA3 function in germ cells involves trafficking or structural roles unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Transgenic rescue and domain-mapping experiments established that a truncated GOLGA3 protein localized to the Golgi is sufficient for spermatocyte survival in a dose-dependent manner, and that the N-terminal head domain (residues 172–257) autonomously targets to the Golgi while harboring a cryptic NLS exposed upon caspase cleavage.\",\n      \"evidence\": \"Transgenic rescue in mice; GFP-tagged deletion constructs with caspase fragment localization in cultured cells\",\n      \"pmids\": [\"11835574\", \"12130652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Golgi targeting within the head domain not determined\", \"Identity of nuclear functions of caspase fragment unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of GCP16 as a palmitoylated Golgi-localized binding partner of GOLGA3 revealed a lipid-modified accessory factor that could anchor GOLGA3 complexes at the membrane.\",\n      \"evidence\": \"Yeast two-hybrid screen using GOLGA3 Golgi-localization domain, confirmed by co-localization and palmitate labeling with C69A/C72A mutagenesis\",\n      \"pmids\": [\"14522980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of GCP16–GOLGA3 interaction for trafficking not tested\", \"Whether GCP16 palmitoylation recruits GOLGA3 or vice versa unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"MLK3 was identified as a kinase that directly phosphorylates the golgin-160 head domain and enhances its caspase cleavage, linking upstream kinase signaling to apoptotic processing of GOLGA3.\",\n      \"evidence\": \"In vitro kinase assay, co-immunoprecipitation, and caspase cleavage enhancement upon MLK3 overexpression\",\n      \"pmids\": [\"14734651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation sites within the head domain not mapped\", \"Physiological stimuli activating MLK3-dependent GOLGA3 cleavage not identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstration that caspase-resistant golgin-160 blocks initiator caspase activation downstream of death receptors and ER stress—but not staurosporine—established GOLGA3 as a stimulus-selective mediator of Golgi-localized apoptotic signaling.\",\n      \"evidence\": \"Stable cell lines expressing caspase-resistant mutant tested with multiple proapoptotic stimuli, measuring caspase activation and viability\",\n      \"pmids\": [\"15829563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which intact golgin-160 promotes initiator caspase activation unknown\", \"Whether GOLGA3 cleavage fragments have direct pro-apoptotic activity in the nucleus untested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"PIST was identified as a PDZ-domain partner of golgin-160 that binds via a leucine-rich repeat, with a naturally occurring splice isoform (golgin-160B) lacking this interaction, suggesting isoform-specific regulation of Golgi sorting.\",\n      \"evidence\": \"Yeast two-hybrid and GST pull-down with domain mapping; characterization of golgin-160B isoform\",\n      \"pmids\": [\"15951434\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo specificity conferred by the golgin-160–PIST interaction not defined\", \"Tissue distribution and functional divergence of the two isoforms not established\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"A series of studies demonstrated that golgin-160 functions as a cargo-selective Golgi sorting adaptor: it directly binds and promotes plasma membrane delivery of beta1AR (via residues 140–257), regulates Golgi sorting of GLUT4/IRAP in adipocytes, and enhances surface density and current of the ROMK channel, while GCP60 retains golgin-160 caspase fragments at the Golgi to prevent nuclear translocation.\",\n      \"evidence\": \"RNAi with rescue, in vitro binding, immuno-EM localization (beta1AR); siRNA knockdown with exocytosis assays (GLUT4); Y2H, co-IP, and electrophysiology in Xenopus oocytes (ROMK); Y2H and co-IP with localization assays (GCP60)\",\n      \"pmids\": [\"17118120\", \"17050738\", \"16543716\", \"16870622\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"General versus cargo-specific sorting mechanism not distinguished\", \"How golgin-160 recognizes structurally diverse cargo cytoplasmic tails not resolved\", \"Whether GLUT4 and beta1AR sorting share the same golgin-160 domain unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"A redox-sensing mechanism was identified in which oxidation of GCP60 Cys-463 controls its binding to the golgin-160 caspase fragment, thereby gating nuclear translocation of this fragment in response to oxidative or nitrosative stress.\",\n      \"evidence\": \"In vitro binding with C463 mutagenesis, H2O2/NO donor treatment, cellular localization\",\n      \"pmids\": [\"17711851\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological redox conditions that trigger this switch in vivo not defined\", \"Nuclear target(s) of the golgin-160 fragment remain unidentified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"An ENU-induced nonsense mutation (repro27) confirmed that complete GOLGA3 loss causes male-specific infertility with elevated apoptosis in late meiosis and downstream defects in acrosome biogenesis, head shaping, and tail development.\",\n      \"evidence\": \"ENU point mutation mouse model with TUNEL, histology, CASA, IVF\",\n      \"pmids\": [\"23495255\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether spermatocyte death results from trafficking failure or apoptotic signaling defect not distinguished\", \"Female reproductive function and somatic phenotypes not fully characterized\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of three basic residues in beta1AR's third intracellular loop as essential for golgin-160-dependent surface delivery—without affecting ER-to-Golgi transit—refined the model that golgin-160 acts at the TGN to load cargo into post-Golgi carriers.\",\n      \"evidence\": \"Site-directed mutagenesis with compartment-specific trafficking assays\",\n      \"pmids\": [\"24566136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct demonstration that golgin-160 acts at the TGN rather than cis-Golgi for this function lacking\", \"Structural basis of the charge-dependent recognition not determined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Phosphorylation at S461 was confirmed biochemically but shown to be dispensable for spermatogenesis in knock-in mice, constraining models of phospho-regulation of GOLGA3 in vivo.\",\n      \"evidence\": \"Cytosine base editor S461L knock-in mouse with histology, TUNEL, CASA\",\n      \"pmids\": [\"37090114\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Other phosphorylation sites (including MLK3 targets) not tested in vivo\", \"Whether S461 phosphorylation affects non-germ-cell functions untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the identity and function of nuclear targets of the golgin-160 caspase fragment, the structural basis by which a single head domain recognizes diverse cargo cytoplasmic tails, whether the trafficking and apoptotic functions are mechanistically linked in spermatocytes, and the full spectrum of GOLGA3-dependent cargo in somatic tissues.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Nuclear function of caspase-generated fragments undefined\", \"No structural model of head-domain–cargo interaction exists\", \"Relationship between trafficking and apoptotic roles in spermatogenesis unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [9, 10, 11, 14]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [10, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 3, 4, 10, 16]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 8, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [9, 10, 11, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5, 7, 8, 12, 13]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [9, 10, 11]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [1, 2, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"GCP16\",\n      \"PIST\",\n      \"GCP60\",\n      \"MLK3\",\n      \"ADRB1\",\n      \"SLC2A4\",\n      \"KCNJ1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}