{"gene":"ASZ1","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2002,"finding":"GASZ (ASZ1) was identified as a novel germ cell-specific protein containing four ankyrin repeats, a sterile-alpha motif (SAM), and a basic leucine zipper (bZIP) domain, localizing to the cytoplasm of pachytene spermatocytes, early spermatids, oocytes, and early preimplantation embryos, consistent with a role as a cytoplasmic signal transducer mediating protein-protein interactions during germ cell maturation.","method":"In silico subtraction, Northern blot, RT-PCR, in situ hybridization, immunohistochemistry","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ISH, IHC, northern blot) establishing localization and expression pattern in germ cells, single lab, no functional loss-of-function","pmids":["12040005"],"is_preprint":false},{"year":2004,"finding":"GASZ (ASZ1) orthologs are evolutionarily conserved across vertebrates (pufferfish, zebrafish, frog), retaining germ cell-specific expression and cytoplasmic localization in pachytene spermatocytes and oocytes; in frog oocytes, GASZ protein localizes to a cytoplasmic structure resembling the Balbiani body.","method":"cDNA cloning, Northern blot, Western blot, in situ hybridization, immunohistochemistry","journal":"Biology of reproduction","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, descriptive localization without functional consequence established","pmids":["14766731"],"is_preprint":false},{"year":2009,"finding":"GASZ (ASZ1) co-localizes with MILI in intermitochondrial cement (nuage) in male germ cells; knockout of Gasz in mice causes dramatic downregulation of MILI protein levels, phenocopies the zygotene-pachytene spermatocyte block and male sterility of MILI-null mice, and results in increased retrotransposon expression, hypomethylation of retrotransposons, and global downregulation of piRNAs (repeat-associated, known, and novel), establishing an essential structural role for GASZ in stabilizing MILI in nuage.","method":"Co-localization by immunofluorescence, Gasz knockout mouse generation, Western blot, small RNA sequencing, bisulfite sequencing, RT-PCR","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with defined cellular and molecular phenotypes, multiple orthogonal methods (co-localization, western blot, small RNA-seq, bisulfite-seq), loss-of-function with specific molecular readouts","pmids":["19730684"],"is_preprint":false},{"year":2015,"finding":"GASZ (ASZ1) contains a functional mitochondrial targeting signal and localizes predominantly to mitochondria in germ cells endogenously and in somatic cells when ectopically expressed; GASZ interacts with itself at the outer mitochondrial membrane and promotes mitofusion in a mitofusin/MFN-dependent manner; deletion of the mitochondrial targeting signal in mice reveals that mitochondrial localization of GASZ is essential for nuage formation, mitochondrial clustering, transposon repression, and spermatogenesis.","method":"Ectopic expression with live imaging/fractionation, co-immunoprecipitation (self-interaction), mitochondrial targeting signal deletion mouse model, confocal microscopy, transposon expression assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (subcellular fractionation, co-IP, deletion mutant mouse, confocal), functional consequence of localization established by in vivo genetic deletion","pmids":["26711429"],"is_preprint":false},{"year":2019,"finding":"Drosophila Gasz (ortholog of ASZ1) interacts with Daedalus (Daed) on the outer mitochondrial membrane and together they form a mitochondrial anchoring platform that recruits and retains the piRNA biogenesis factor Armitage (Armi) proximal to Zucchini for piRNA processing; Gasz is essential for Zucchini-mediated piRNA production and correct localization of Armi.","method":"Co-immunoprecipitation, genetic loss-of-function (Drosophila), immunofluorescence localization, small RNA sequencing","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP establishing Gasz-Daed interaction, Drosophila genetic loss-of-function with defined piRNA biogenesis phenotype, multiple orthogonal methods","pmids":["31123065"],"is_preprint":false}],"current_model":"ASZ1/GASZ is a germ cell-specific protein that localizes to intermitochondrial cement (nuage) and the outer mitochondrial membrane via a functional mitochondrial targeting signal; it stabilizes the piRNA pathway protein MILI in nuage, promotes mitofusin-dependent mitochondrial fusion, and, together with its binding partner Daedalus, forms a mitochondrial anchoring platform that recruits Armitage to present piRNA precursors to the Zucchini processing machinery, thereby being essential for piRNA biogenesis, transposon silencing, and male fertility."},"narrative":{"mechanistic_narrative":"ASZ1 (GASZ) is a germ cell-specific protein essential for piRNA biogenesis, transposon silencing, and fertility [PMID:19730684]. It localizes to the outer mitochondrial membrane through a functional mitochondrial targeting signal and self-associates there, promoting mitofusin-dependent mitochondrial fusion and clustering; this mitochondrial localization is required for nuage (intermitochondrial cement) formation, transposon repression, and spermatogenesis [PMID:26711429]. Within nuage, ASZ1 co-localizes with and stabilizes the piRNA pathway protein MILI, and its loss causes MILI downregulation, global piRNA depletion, retrotransposon derepression and hypomethylation, and a zygotene-pachytene spermatocyte arrest [PMID:19730684]. Mechanistically, ASZ1 acts as a mitochondrial anchoring platform: together with its binding partner Daedalus it recruits and retains the piRNA biogenesis factor Armitage near the Zucchini processing machinery, making it essential for Zucchini-mediated piRNA production [PMID:31123065]. The protein architecture comprises ankyrin repeats, a SAM domain, and a bZIP domain, consistent with a scaffolding role in protein-protein interactions [PMID:12040005].","teleology":[{"year":2002,"claim":"Established ASZ1/GASZ as a previously unknown germ cell-specific cytoplasmic protein with a domain architecture (ankyrin/SAM/bZIP) suited to mediating protein-protein interactions during germ cell maturation.","evidence":"In silico subtraction with Northern blot, RT-PCR, in situ hybridization, and immunohistochemistry in germ cells","pmids":["12040005"],"confidence":"Medium","gaps":["No functional loss-of-function tested","No binding partners identified","Subcellular localization defined only as cytoplasmic"]},{"year":2004,"claim":"Showed the germ cell-specific expression and cytoplasmic localization are evolutionarily conserved across vertebrates, hinting at a conserved germline function.","evidence":"cDNA cloning, Northern/Western blot, ISH and IHC across pufferfish, zebrafish, and frog","pmids":["14766731"],"confidence":"Low","gaps":["Descriptive localization only, no functional consequence established","Balbiani body association not mechanistically linked to any pathway"]},{"year":2009,"claim":"Defined ASZ1's essential function in the piRNA pathway by showing it stabilizes MILI in nuage and is required for transposon silencing and male fertility.","evidence":"Gasz knockout mouse with co-localization, Western blot, small RNA-seq, and bisulfite sequencing","pmids":["19730684"],"confidence":"High","gaps":["Did not establish how ASZ1 physically stabilizes MILI","Subcellular anchoring mechanism not yet resolved"]},{"year":2015,"claim":"Resolved the subcellular basis of ASZ1 function, showing it targets the outer mitochondrial membrane, self-associates, drives mitofusin-dependent mitochondrial fusion, and that this localization is required for nuage formation and spermatogenesis.","evidence":"Ectopic expression with live imaging/fractionation, self co-IP, and a mitochondrial targeting signal deletion mouse model with confocal imaging and transposon assays","pmids":["26711429"],"confidence":"High","gaps":["Direct molecular link between mitochondrial fusion and piRNA processing not detailed","Partners bridging the mitochondrial platform to processing enzymes not identified in this study"]},{"year":2019,"claim":"Identified the molecular mechanism by which ASZ1 organizes piRNA biogenesis: with Daedalus it forms a mitochondrial anchoring platform recruiting Armitage to the Zucchini processing machinery.","evidence":"Reciprocal co-IP, Drosophila genetic loss-of-function, immunofluorescence localization, and small RNA sequencing","pmids":["31123065"],"confidence":"High","gaps":["A direct mammalian counterpart of the Gasz-Daedalus-Armitage axis not confirmed in mouse","Structural basis of the anchoring platform unknown"]},{"year":null,"claim":"How the ASZ1 mitochondrial scaffold mechanistically couples mitochondrial fusion to nuage assembly and piRNA precursor presentation at the molecular and structural level remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of the ASZ1 anchoring platform","Mechanism by which mitochondrial fusion supports piRNA processing unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,4]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3,4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[2,4]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[2,3]}],"complexes":["intermitochondrial cement (nuage)"],"partners":["MILI","DAEDALUS","ARMITAGE","MFN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8WWH4","full_name":"Ankyrin repeat, SAM and basic leucine zipper domain-containing protein 1","aliases":["Ankyrin-like protein 1","Germ cell-specific ankyrin, SAM and basic leucine zipper domain-containing protein"],"length_aa":475,"mass_kda":53.5,"function":"Plays a central role during spermatogenesis by repressing transposable elements and preventing their mobilization, which is essential for the germline integrity. Acts via the piRNA metabolic process, which mediates the repression of transposable elements during meiosis by forming complexes composed of piRNAs and Piwi proteins and governs the methylation and subsequent repression of transposons. Its association with pi-bodies suggests a participation in the primary piRNAs metabolic process. Required prior to the pachytene stage to facilitate the production of multiple types of piRNAs, including those associated with repeats involved in the regulation of retrotransposons. May act by mediating protein-protein interactions during germ cell maturation (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q8WWH4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ASZ1","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ASZ1","total_profiled":1310},"omim":[{"mim_id":"605797","title":"ANKYRIN REPEAT, SAM, AND BASIC LEUCINE ZIPPER DOMAIN-CONTAINING 1; ASZ1","url":"https://www.omim.org/entry/605797"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in single","driving_tissues":[{"tissue":"testis","ntpm":10.0}],"url":"https://www.proteinatlas.org/search/ASZ1"},"hgnc":{"alias_symbol":["Orf3","GASZ","ALP1","CT1.19"],"prev_symbol":["C7orf7","ANKL1"]},"alphafold":{"accession":"Q8WWH4","domains":[{"cath_id":"1.25.40.20","chopping":"40-236","consensus_level":"medium","plddt":92.8986,"start":40,"end":236},{"cath_id":"1.10.150.50","chopping":"279-333","consensus_level":"medium","plddt":76.7089,"start":279,"end":333}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WWH4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WWH4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WWH4-F1-predicted_aligned_error_v6.png","plddt_mean":67.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ASZ1","jax_strain_url":"https://www.jax.org/strain/search?query=ASZ1"},"sequence":{"accession":"Q8WWH4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8WWH4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8WWH4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WWH4"}},"corpus_meta":[{"pmid":"7559785","id":"PMC_7559785","title":"Targeting of adenovirus E1A and E4-ORF3 proteins to nuclear matrix-associated PML bodies.","date":"1995","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/7559785","citation_count":248,"is_preprint":false},{"pmid":"10544286","id":"PMC_10544286","title":"Functional assignment of the ORF2-iscS-iscU-iscA-hscB-hscA-fdx-ORF3 gene cluster involved in the assembly of Fe-S clusters in Escherichia coli.","date":"1999","source":"Journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10544286","citation_count":228,"is_preprint":false},{"pmid":"16731930","id":"PMC_16731930","title":"A bicistronic subgenomic mRNA encodes both the ORF2 and ORF3 proteins of hepatitis E virus.","date":"2006","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/16731930","citation_count":220,"is_preprint":false},{"pmid":"9371561","id":"PMC_9371561","title":"The ORF3 protein of hepatitis E virus is a phosphoprotein that associates with the cytoskeleton.","date":"1997","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/9371561","citation_count":207,"is_preprint":false},{"pmid":"28096411","id":"PMC_28096411","title":"Hepatitis E virus ORF3 is a functional ion channel required for release of infectious particles.","date":"2017","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/28096411","citation_count":192,"is_preprint":false},{"pmid":"19339479","id":"PMC_19339479","title":"ORF3 protein of hepatitis E virus is essential for virion release from infected cells.","date":"2009","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/19339479","citation_count":190,"is_preprint":false},{"pmid":"10393315","id":"PMC_10393315","title":"Hyperproduction of recombinant ferredoxins in escherichia coli by coexpression of the ORF1-ORF2-iscS-iscU-iscA-hscB-hs cA-fdx-ORF3 gene cluster.","date":"1999","source":"Journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10393315","citation_count":173,"is_preprint":false},{"pmid":"2167832","id":"PMC_2167832","title":"Cytochrome oxidase assembly in yeast requires the product of COX11, a homolog of the P. denitrificans protein encoded by ORF3.","date":"1990","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/2167832","citation_count":154,"is_preprint":false},{"pmid":"19730684","id":"PMC_19730684","title":"GASZ is essential for male meiosis and suppression of retrotransposon expression in the male germline.","date":"2009","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19730684","citation_count":149,"is_preprint":false},{"pmid":"22245155","id":"PMC_22245155","title":"PEDV ORF3 encodes an ion channel protein and regulates virus production.","date":"2012","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/22245155","citation_count":146,"is_preprint":false},{"pmid":"18679765","id":"PMC_18679765","title":"Monoclonal antibodies raised against the ORF3 protein of hepatitis E virus (HEV) can capture HEV particles in culture supernatant and serum but not those in feces.","date":"2008","source":"Archives of virology","url":"https://pubmed.ncbi.nlm.nih.gov/18679765","citation_count":144,"is_preprint":false},{"pmid":"21068219","id":"PMC_21068219","title":"A PSAP motif in the ORF3 protein of hepatitis E virus is necessary for virion release from infected cells.","date":"2010","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/21068219","citation_count":139,"is_preprint":false},{"pmid":"16641298","id":"PMC_16641298","title":"The ORF3 protein of porcine circovirus type 2 is involved in viral pathogenesis in vivo.","date":"2006","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/16641298","citation_count":136,"is_preprint":false},{"pmid":"15858005","id":"PMC_15858005","title":"Relocalization of the Mre11-Rad50-Nbs1 complex by the adenovirus E4 ORF3 protein is required for viral replication.","date":"2005","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/15858005","citation_count":126,"is_preprint":false},{"pmid":"11518702","id":"PMC_11518702","title":"The ORF3 protein of hepatitis E virus binds to Src homology 3 domains and activates MAPK.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11518702","citation_count":121,"is_preprint":false},{"pmid":"11934888","id":"PMC_11934888","title":"The phosphorylated form of the ORF3 protein of hepatitis E virus interacts with its non-glycosylated form of the major capsid protein, ORF2.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11934888","citation_count":104,"is_preprint":false},{"pmid":"9208452","id":"PMC_9208452","title":"Baculovirus expression of proteins of porcine reproductive and respiratory syndrome virus strain Olot/91. Involvement of ORF3 and ORF5 proteins in protection.","date":"1997","source":"Virus genes","url":"https://pubmed.ncbi.nlm.nih.gov/9208452","citation_count":104,"is_preprint":false},{"pmid":"16928762","id":"PMC_16928762","title":"ORF3 protein of hepatitis E virus is not required for replication, virion assembly, or infection of hepatoma cells in vitro.","date":"2006","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/16928762","citation_count":102,"is_preprint":false},{"pmid":"10211970","id":"PMC_10211970","title":"The adenovirus type 5 E1b 55K and E4 Orf3 proteins associate in infected cells and affect ND10 components.","date":"1999","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/10211970","citation_count":93,"is_preprint":false},{"pmid":"17932736","id":"PMC_17932736","title":"Cloning and further sequence analysis of the ORF3 gene of wild- and attenuated-type porcine epidemic diarrhea viruses.","date":"2007","source":"Virus genes","url":"https://pubmed.ncbi.nlm.nih.gov/17932736","citation_count":86,"is_preprint":false},{"pmid":"18448545","id":"PMC_18448545","title":"The hepatitis E virus ORF3 protein modulates epidermal growth factor receptor trafficking, STAT3 translocation, and the acute-phase response.","date":"2008","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/18448545","citation_count":86,"is_preprint":false},{"pmid":"15813736","id":"PMC_15813736","title":"Enteropathogenic Escherichia coli EspG disrupts microtubules and in conjunction with Orf3 enhances perturbation of the tight junction barrier.","date":"2005","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/15813736","citation_count":82,"is_preprint":false},{"pmid":"11062050","id":"PMC_11062050","title":"Identification and genomic mapping of the ORF3 and VPg proteins in feline calicivirus virions.","date":"2000","source":"Virology","url":"https://pubmed.ncbi.nlm.nih.gov/11062050","citation_count":81,"is_preprint":false},{"pmid":"30532200","id":"PMC_30532200","title":"Palmitoylation mediates membrane association of hepatitis E virus ORF3 protein and is required for infectious particle secretion.","date":"2018","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/30532200","citation_count":80,"is_preprint":false},{"pmid":"18480450","id":"PMC_18480450","title":"Cellular proteins PML and Daxx mediate an innate antiviral defense antagonized by the adenovirus E4 ORF3 protein.","date":"2008","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/18480450","citation_count":80,"is_preprint":false},{"pmid":"12692231","id":"PMC_12692231","title":"Distinct roles of the Adenovirus E4 ORF3 protein in viral DNA replication and inhibition of genome concatenation.","date":"2003","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/12692231","citation_count":76,"is_preprint":false},{"pmid":"12940984","id":"PMC_12940984","title":"Pseudomonas syringae pv. tomato DC3000 HopPtoM (CEL ORF3) is important for lesion formation but not growth in tomato and is secreted and translocated by the Hrp type III secretion system in a chaperone-dependent manner.","date":"2003","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/12940984","citation_count":75,"is_preprint":false},{"pmid":"17581998","id":"PMC_17581998","title":"The ORF3 protein of porcine circovirus type 2 interacts with porcine ubiquitin E3 ligase Pirh2 and facilitates p53 expression in viral infection.","date":"2007","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/17581998","citation_count":73,"is_preprint":false},{"pmid":"12040005","id":"PMC_12040005","title":"Identification of Gasz, an evolutionarily conserved gene expressed exclusively in germ cells and encoding a protein with four ankyrin repeats, a sterile-alpha motif, and a basic leucine zipper.","date":"2002","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/12040005","citation_count":70,"is_preprint":false},{"pmid":"31383304","id":"PMC_31383304","title":"Porcine epidemic diarrhea virus ORF3 protein causes endoplasmic reticulum stress to facilitate autophagy.","date":"2019","source":"Veterinary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/31383304","citation_count":70,"is_preprint":false},{"pmid":"17301128","id":"PMC_17301128","title":"Adenovirus E4 ORF3 protein inhibits the interferon-mediated antiviral response.","date":"2007","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/17301128","citation_count":69,"is_preprint":false},{"pmid":"17488721","id":"PMC_17488721","title":"The hepatitis E virus Orf3 protein protects cells from mitochondrial depolarization and death.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17488721","citation_count":66,"is_preprint":false},{"pmid":"8558120","id":"PMC_8558120","title":"Detection of the ORF3 polypeptide of feline calicivirus in infected cells and evidence for its expression from a single, functionally bicistronic, subgenomic mRNA.","date":"1996","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/8558120","citation_count":65,"is_preprint":false},{"pmid":"15037615","id":"PMC_15037615","title":"The ORF3 protein of hepatitis E virus interacts with liver-specific alpha1-microglobulin and its precursor alpha1-microglobulin/bikunin precursor (AMBP) and expedites their export from the hepatocyte.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15037615","citation_count":65,"is_preprint":false},{"pmid":"32075094","id":"PMC_32075094","title":"Porcine Epidemic Diarrhea Virus (PEDV) ORF3 Enhances Viral Proliferation by Inhibiting Apoptosis of Infected Cells.","date":"2020","source":"Viruses","url":"https://pubmed.ncbi.nlm.nih.gov/32075094","citation_count":65,"is_preprint":false},{"pmid":"24850742","id":"PMC_24850742","title":"Enhancement of interferon induction by ORF3 product of hepatitis E virus.","date":"2014","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/24850742","citation_count":59,"is_preprint":false},{"pmid":"16407257","id":"PMC_16407257","title":"Enhanced alpha1 microglobulin secretion from Hepatitis E virus ORF3-expressing human hepatoma cells is mediated by the tumor susceptibility gene 101.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16407257","citation_count":57,"is_preprint":false},{"pmid":"10438837","id":"PMC_10438837","title":"Roles for the E4 orf6, orf3, and E1B 55-kilodalton proteins in cell cycle-independent adenovirus replication.","date":"1999","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/10438837","citation_count":55,"is_preprint":false},{"pmid":"16501113","id":"PMC_16501113","title":"Interaction of the adenovirus type 5 E4 Orf3 protein with promyelocytic leukemia protein isoform II is required for ND10 disruption.","date":"2006","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/16501113","citation_count":55,"is_preprint":false},{"pmid":"2545526","id":"PMC_2545526","title":"Analysis of the cis-acting requirements for germ-line-specific splicing of the P-element ORF2-ORF3 intron.","date":"1989","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/2545526","citation_count":55,"is_preprint":false},{"pmid":"24291225","id":"PMC_24291225","title":"Genetic diversity of ORF3 and spike genes of porcine epidemic diarrhea virus in Thailand.","date":"2013","source":"Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/24291225","citation_count":54,"is_preprint":false},{"pmid":"26711429","id":"PMC_26711429","title":"GASZ and mitofusin-mediated mitochondrial functions are crucial for spermatogenesis.","date":"2015","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/26711429","citation_count":53,"is_preprint":false},{"pmid":"19489936","id":"PMC_19489936","title":"The hepatitis E virus ORF3 protein stabilizes HIF-1alpha and enhances HIF-1-mediated transcriptional activity through p300/CBP.","date":"2009","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/19489936","citation_count":53,"is_preprint":false},{"pmid":"27270888","id":"PMC_27270888","title":"The ORF3 Protein of Genotype 1 Hepatitis E Virus Suppresses TLR3-induced NF-κB Signaling via TRADD and RIP1.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27270888","citation_count":51,"is_preprint":false},{"pmid":"26531166","id":"PMC_26531166","title":"Porcine epidemic diarrhea virus ORF3 gene prolongs S-phase, facilitates formation of vesicles and promotes the proliferation of attenuated PEDV.","date":"2015","source":"Virus genes","url":"https://pubmed.ncbi.nlm.nih.gov/26531166","citation_count":49,"is_preprint":false},{"pmid":"17381721","id":"PMC_17381721","title":"T-cell epitope mapping of ORF2 and ORF3 proteins of human hepatitis E virus.","date":"2007","source":"Journal of viral hepatitis","url":"https://pubmed.ncbi.nlm.nih.gov/17381721","citation_count":47,"is_preprint":false},{"pmid":"20130058","id":"PMC_20130058","title":"The ORF3 protein of hepatitis E virus delays degradation of activated growth factor receptors by interacting with CIN85 and blocking formation of the Cbl-CIN85 complex.","date":"2010","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/20130058","citation_count":46,"is_preprint":false},{"pmid":"22438540","id":"PMC_22438540","title":"The PSAP motif within the ORF3 protein of an avian strain of the hepatitis E virus is not critical for viral infectivity in vivo but plays a role in virus release.","date":"2012","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/22438540","citation_count":46,"is_preprint":false},{"pmid":"22537707","id":"PMC_22537707","title":"ORF3 of duck circovirus: a novel protein with apoptotic activity.","date":"2012","source":"Veterinary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/22537707","citation_count":45,"is_preprint":false},{"pmid":"19852989","id":"PMC_19852989","title":"The open reading frame 3 (ORF3) of porcine circovirus type 2 (PCV2) is dispensable for virus infection but evidence of reduced pathogenicity is limited in pigs infected by an ORF3-null PCV2 mutant.","date":"2009","source":"Virus research","url":"https://pubmed.ncbi.nlm.nih.gov/19852989","citation_count":45,"is_preprint":false},{"pmid":"27494026","id":"PMC_27494026","title":"Molecular Characterization of the ORF3 and S1 Genes of Porcine Epidemic Diarrhea Virus Non S-INDEL Strains in Seven Regions of China, 2015.","date":"2016","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/27494026","citation_count":44,"is_preprint":false},{"pmid":"9856081","id":"PMC_9856081","title":"A nonstructural and antigenic glycoprotein is encoded by ORF3 of the IAF-Klop strain of porcine reproductive and respiratory syndrome virus.","date":"1998","source":"Archives of virology","url":"https://pubmed.ncbi.nlm.nih.gov/9856081","citation_count":43,"is_preprint":false},{"pmid":"30060558","id":"PMC_30060558","title":"The Accessory Protein ORF3 Contributes to Porcine Epidemic Diarrhea Virus Replication by Direct Binding to the Spike Protein.","date":"2018","source":"Viruses","url":"https://pubmed.ncbi.nlm.nih.gov/30060558","citation_count":42,"is_preprint":false},{"pmid":"16140784","id":"PMC_16140784","title":"The 41-amino-acid C-terminal region of the hepatitis E virus ORF3 protein interacts with bikunin, a kunitz-type serine protease inhibitor.","date":"2005","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/16140784","citation_count":40,"is_preprint":false},{"pmid":"31123065","id":"PMC_31123065","title":"Daedalus and Gasz recruit Armitage to mitochondria, bringing piRNA precursors to the biogenesis machinery.","date":"2019","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/31123065","citation_count":38,"is_preprint":false},{"pmid":"21144544","id":"PMC_21144544","title":"ORF3 of porcine circovirus 2 enhances the in vitro and in vivo spread of the of the virus.","date":"2010","source":"Virology","url":"https://pubmed.ncbi.nlm.nih.gov/21144544","citation_count":38,"is_preprint":false},{"pmid":"10024604","id":"PMC_10024604","title":"Characterization of Moraxella (Branhamella) catarrhalis lbpB, lbpA, and lactoferrin receptor orf3 isogenic mutants.","date":"1999","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/10024604","citation_count":38,"is_preprint":false},{"pmid":"21799848","id":"PMC_21799848","title":"The hepatitis E virus ORF3 protein regulates the expression of liver-specific genes by modulating localization of hepatocyte nuclear factor 4.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21799848","citation_count":36,"is_preprint":false},{"pmid":"26457367","id":"PMC_26457367","title":"Replacement of the hepatitis E virus ORF3 protein PxxP motif with heterologous late domain motifs affects virus release via interaction with TSG101.","date":"2015","source":"Virology","url":"https://pubmed.ncbi.nlm.nih.gov/26457367","citation_count":36,"is_preprint":false},{"pmid":"18211098","id":"PMC_18211098","title":"The ORF3 protein of hepatitis E virus interacts with hemopexin by means of its 26 amino acid N-terminal hydrophobic domain II.","date":"2008","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18211098","citation_count":35,"is_preprint":false},{"pmid":"30651358","id":"PMC_30651358","title":"Porcine Circovirus Type 2 Induces ORF3-Independent Mitochondrial Apoptosis via PERK Activation and Elevation of Cytosolic Calcium.","date":"2019","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/30651358","citation_count":35,"is_preprint":false},{"pmid":"11160756","id":"PMC_11160756","title":"Self-association and mapping of the interaction domain of hepatitis E virus ORF3 protein.","date":"2001","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/11160756","citation_count":35,"is_preprint":false},{"pmid":"22278248","id":"PMC_22278248","title":"Herpesvirus saimiri antagonizes nuclear domain 10-instituted intrinsic immunity via an ORF3-mediated selective degradation of cellular protein Sp100.","date":"2012","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/22278248","citation_count":35,"is_preprint":false},{"pmid":"27887624","id":"PMC_27887624","title":"Detection and phylogenetic analysis of porcine epidemic diarrhea virus in central China based on the ORF3 gene and the S1 gene.","date":"2016","source":"Virology journal","url":"https://pubmed.ncbi.nlm.nih.gov/27887624","citation_count":34,"is_preprint":false},{"pmid":"19012942","id":"PMC_19012942","title":"Attenuation of porcine circovirus 2 in SPF piglets by abrogation of ORF3 function.","date":"2008","source":"Virology","url":"https://pubmed.ncbi.nlm.nih.gov/19012942","citation_count":33,"is_preprint":false},{"pmid":"20004925","id":"PMC_20004925","title":"Porcine circovirus type 2 ORF3 protein competes with p53 in binding to Pirh2 and mediates the deregulation of p53 homeostasis.","date":"2009","source":"Virology","url":"https://pubmed.ncbi.nlm.nih.gov/20004925","citation_count":31,"is_preprint":false},{"pmid":"24292967","id":"PMC_24292967","title":"Phylogenetic analysis of porcine epidemic diarrhea virus (PEDV) field strains in central China based on the ORF3 gene and the main neutralization epitopes.","date":"2013","source":"Archives of virology","url":"https://pubmed.ncbi.nlm.nih.gov/24292967","citation_count":30,"is_preprint":false},{"pmid":"1591248","id":"PMC_1591248","title":"Identification of the three-dimensional thioredoxin motif: related structure in the ORF3 protein of the Staphylococcus aureus mer operon.","date":"1992","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/1591248","citation_count":30,"is_preprint":false},{"pmid":"29872132","id":"PMC_29872132","title":"HEV ORF3 downregulates TLR7 to inhibit the generation of type I interferon via impairment of multiple signaling pathways.","date":"2018","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/29872132","citation_count":28,"is_preprint":false},{"pmid":"20810737","id":"PMC_20810737","title":"Cytotoxicity of ORF3 proteins from a nonpathogenic and a pathogenic porcine circovirus.","date":"2010","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/20810737","citation_count":27,"is_preprint":false},{"pmid":"33126183","id":"PMC_33126183","title":"The accessory protein ORF3 of porcine epidemic diarrhea virus inhibits cellular interleukin-6 and interleukin-8 productions by blocking the nuclear factor-κB p65 activation.","date":"2020","source":"Veterinary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/33126183","citation_count":27,"is_preprint":false},{"pmid":"8063112","id":"PMC_8063112","title":"Sequence of the rec-2 locus of Haemophilus influenzae: homologies to comE-ORF3 of Bacillus subtilis and msbA of Escherichia coli.","date":"1994","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/8063112","citation_count":27,"is_preprint":false},{"pmid":"11227191","id":"PMC_11227191","title":"Efficacy of a transmissible gastroenteritis coronavirus with an altered ORF-3 gene.","date":"2001","source":"Canadian journal of veterinary research = Revue canadienne de recherche veterinaire","url":"https://pubmed.ncbi.nlm.nih.gov/11227191","citation_count":27,"is_preprint":false},{"pmid":"17287283","id":"PMC_17287283","title":"The adenovirus E4 ORF3 protein binds and reorganizes the TRIM family member transcriptional intermediary factor 1 alpha.","date":"2007","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/17287283","citation_count":26,"is_preprint":false},{"pmid":"25575706","id":"PMC_25575706","title":"The ORF3 protein of porcine circovirus type 2 promotes secretion of IL-6 and IL-8 in porcine epithelial cells by facilitating proteasomal degradation of regulator of G protein signalling 16 through physical interaction.","date":"2015","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/25575706","citation_count":26,"is_preprint":false},{"pmid":"27113483","id":"PMC_27113483","title":"Identification of critical residues in Hepatitis E virus macro domain involved in its interaction with viral methyltransferase and ORF3 proteins.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27113483","citation_count":26,"is_preprint":false},{"pmid":"27247387","id":"PMC_27247387","title":"The adenovirus E4-ORF3 protein functions as a SUMO E3 ligase for TIF-1γ sumoylation and poly-SUMO chain elongation.","date":"2016","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/27247387","citation_count":25,"is_preprint":false},{"pmid":"29471051","id":"PMC_29471051","title":"An analysis of two open reading frames (ORF3 and ORF4) of rat hepatitis E virus genome using its infectious cDNA clones with mutations in ORF3 or ORF4.","date":"2018","source":"Virus research","url":"https://pubmed.ncbi.nlm.nih.gov/29471051","citation_count":25,"is_preprint":false},{"pmid":"19382255","id":"PMC_19382255","title":"Varying abilities of recombinant polypeptides from different regions of hepatitis E virus ORF2 and ORF3 to detect anti-HEV immunoglobulin M.","date":"2009","source":"Journal of medical virology","url":"https://pubmed.ncbi.nlm.nih.gov/19382255","citation_count":25,"is_preprint":false},{"pmid":"8203122","id":"PMC_8203122","title":"Cloning and sequencing of the chicken anaemia virus (CAV) ORF-3 gene, and the development of an ELISA for the detection of serum antibody to CAV.","date":"1994","source":"Veterinary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/8203122","citation_count":25,"is_preprint":false},{"pmid":"19264644","id":"PMC_19264644","title":"ORF3 protein of hepatitis E virus interacts with the Bbeta chain of fibrinogen resulting in decreased fibrinogen secretion from HuH-7 cells.","date":"2009","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/19264644","citation_count":24,"is_preprint":false},{"pmid":"36945252","id":"PMC_36945252","title":"Coronavirus accessory protein ORF3 biology and its contribution to viral behavior and pathogenesis.","date":"2023","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/36945252","citation_count":23,"is_preprint":false},{"pmid":"28474223","id":"PMC_28474223","title":"The role of ORF3 accessory protein in replication of cell-adapted porcine epidemic diarrhea virus (PEDV).","date":"2017","source":"Archives of virology","url":"https://pubmed.ncbi.nlm.nih.gov/28474223","citation_count":23,"is_preprint":false},{"pmid":"9806862","id":"PMC_9806862","title":"Kluyveromyces lactis killer plasmid pGKL2: evidence for a viral-like capping enzyme encoded by ORF3.","date":"1998","source":"Plasmid","url":"https://pubmed.ncbi.nlm.nih.gov/9806862","citation_count":23,"is_preprint":false},{"pmid":"32554695","id":"PMC_32554695","title":"Porcine Epidemic Diarrhea Virus ORF3 Protein Is Transported through the Exocytic Pathway.","date":"2020","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/32554695","citation_count":22,"is_preprint":false},{"pmid":"34452427","id":"PMC_34452427","title":"Comparative Characterization and Pathogenicity of a Novel Porcine Epidemic Diarrhea Virus (PEDV) with a Naturally Occurring Truncated ORF3 Gene Coinfected with PEDVs Possessing an Intact ORF3 Gene in Piglets.","date":"2021","source":"Viruses","url":"https://pubmed.ncbi.nlm.nih.gov/34452427","citation_count":22,"is_preprint":false},{"pmid":"34523963","id":"PMC_34523963","title":"The Viral ORF3 Protein Is Required for Hepatitis E Virus Apical Release and Efficient Growth in Polarized Hepatocytes and Humanized Mice.","date":"2021","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/34523963","citation_count":22,"is_preprint":false},{"pmid":"9185850","id":"PMC_9185850","title":"Expression and characterization of the hepatitis E virus ORF3 protein in the methylotrophic yeast, Pichia pastoris.","date":"1997","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/9185850","citation_count":22,"is_preprint":false},{"pmid":"26814176","id":"PMC_26814176","title":"The Adenovirus E4-ORF3 Protein Stimulates SUMOylation of General Transcription Factor TFII-I to Direct Proteasomal Degradation.","date":"2016","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/26814176","citation_count":22,"is_preprint":false},{"pmid":"25280525","id":"PMC_25280525","title":"Evidence of MAPK-JNK1/2 activation by hepatitis E virus ORF3 protein in cultured hepatoma cells.","date":"2014","source":"Cytotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/25280525","citation_count":22,"is_preprint":false},{"pmid":"19763777","id":"PMC_19763777","title":"Immunogenicity and efficacy of a bacterially expressed HEV ORF3 peptide, assessed by experimental infection of primates.","date":"2009","source":"Archives of virology","url":"https://pubmed.ncbi.nlm.nih.gov/19763777","citation_count":22,"is_preprint":false},{"pmid":"26223632","id":"PMC_26223632","title":"Adenovirus E4-ORF3 Targets PIAS3 and Together with E1B-55K Remodels SUMO Interactions in the Nucleus and at Virus Genome Replication Domains.","date":"2015","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/26223632","citation_count":21,"is_preprint":false},{"pmid":"12610132","id":"PMC_12610132","title":"Two nonoverlapping domains on the Norwalk virus open reading frame 3 (ORF3) protein are involved in the formation of the phosphorylated 35K protein and in ORF3-capsid protein interactions.","date":"2003","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/12610132","citation_count":21,"is_preprint":false},{"pmid":"24578626","id":"PMC_24578626","title":"Genetic variability and phylogeny of current Chinese porcine epidemic diarrhea virus strains based on spike, ORF3, and membrane genes.","date":"2014","source":"TheScientificWorldJournal","url":"https://pubmed.ncbi.nlm.nih.gov/24578626","citation_count":21,"is_preprint":false},{"pmid":"24084234","id":"PMC_24084234","title":"Sequence heterogeneity of the ORF3 gene of porcine epidemic diarrhea viruses field samples in Fujian, China, 2010-2012.","date":"2013","source":"Viruses","url":"https://pubmed.ncbi.nlm.nih.gov/24084234","citation_count":21,"is_preprint":false},{"pmid":"32423021","id":"PMC_32423021","title":"PEDV ORF3 Independently Regulates IκB Kinase β-Mediated NF-κB and IFN-β Promoter Activities.","date":"2020","source":"Pathogens (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/32423021","citation_count":20,"is_preprint":false},{"pmid":"35336894","id":"PMC_35336894","title":"Genetic Characteristics and Pathogenicity of a Novel Porcine Epidemic Diarrhea Virus with a Naturally Occurring Truncated ORF3 Gene.","date":"2022","source":"Viruses","url":"https://pubmed.ncbi.nlm.nih.gov/35336894","citation_count":20,"is_preprint":false},{"pmid":"26771290","id":"PMC_26771290","title":"ORF3 of Hepatitis E Virus Inhibits the Expression of Proinflammatory Cytokines and Chemotactic Factors in LPS-Stimulated Human PMA-THP1 Cells by Inhibiting NF-κB Pathway.","date":"2016","source":"Viral immunology","url":"https://pubmed.ncbi.nlm.nih.gov/26771290","citation_count":20,"is_preprint":false},{"pmid":"25410875","id":"PMC_25410875","title":"Proteomic analysis of ubiquitin-like posttranslational modifications induced by the adenovirus E4-ORF3 protein.","date":"2014","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/25410875","citation_count":20,"is_preprint":false},{"pmid":"14766731","id":"PMC_14766731","title":"Identification and characterization of evolutionarily conserved pufferfish, zebrafish, and frog orthologs of GASZ.","date":"2004","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/14766731","citation_count":19,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51627,"output_tokens":1523,"usd":0.088863,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8261,"output_tokens":2112,"usd":0.047052,"stage2_stop_reason":"end_turn"},"total_usd":0.135915,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"GASZ (ASZ1) was identified as a novel germ cell-specific protein containing four ankyrin repeats, a sterile-alpha motif (SAM), and a basic leucine zipper (bZIP) domain, localizing to the cytoplasm of pachytene spermatocytes, early spermatids, oocytes, and early preimplantation embryos, consistent with a role as a cytoplasmic signal transducer mediating protein-protein interactions during germ cell maturation.\",\n      \"method\": \"In silico subtraction, Northern blot, RT-PCR, in situ hybridization, immunohistochemistry\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ISH, IHC, northern blot) establishing localization and expression pattern in germ cells, single lab, no functional loss-of-function\",\n      \"pmids\": [\"12040005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"GASZ (ASZ1) orthologs are evolutionarily conserved across vertebrates (pufferfish, zebrafish, frog), retaining germ cell-specific expression and cytoplasmic localization in pachytene spermatocytes and oocytes; in frog oocytes, GASZ protein localizes to a cytoplasmic structure resembling the Balbiani body.\",\n      \"method\": \"cDNA cloning, Northern blot, Western blot, in situ hybridization, immunohistochemistry\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, descriptive localization without functional consequence established\",\n      \"pmids\": [\"14766731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GASZ (ASZ1) co-localizes with MILI in intermitochondrial cement (nuage) in male germ cells; knockout of Gasz in mice causes dramatic downregulation of MILI protein levels, phenocopies the zygotene-pachytene spermatocyte block and male sterility of MILI-null mice, and results in increased retrotransposon expression, hypomethylation of retrotransposons, and global downregulation of piRNAs (repeat-associated, known, and novel), establishing an essential structural role for GASZ in stabilizing MILI in nuage.\",\n      \"method\": \"Co-localization by immunofluorescence, Gasz knockout mouse generation, Western blot, small RNA sequencing, bisulfite sequencing, RT-PCR\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with defined cellular and molecular phenotypes, multiple orthogonal methods (co-localization, western blot, small RNA-seq, bisulfite-seq), loss-of-function with specific molecular readouts\",\n      \"pmids\": [\"19730684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GASZ (ASZ1) contains a functional mitochondrial targeting signal and localizes predominantly to mitochondria in germ cells endogenously and in somatic cells when ectopically expressed; GASZ interacts with itself at the outer mitochondrial membrane and promotes mitofusion in a mitofusin/MFN-dependent manner; deletion of the mitochondrial targeting signal in mice reveals that mitochondrial localization of GASZ is essential for nuage formation, mitochondrial clustering, transposon repression, and spermatogenesis.\",\n      \"method\": \"Ectopic expression with live imaging/fractionation, co-immunoprecipitation (self-interaction), mitochondrial targeting signal deletion mouse model, confocal microscopy, transposon expression assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (subcellular fractionation, co-IP, deletion mutant mouse, confocal), functional consequence of localization established by in vivo genetic deletion\",\n      \"pmids\": [\"26711429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Drosophila Gasz (ortholog of ASZ1) interacts with Daedalus (Daed) on the outer mitochondrial membrane and together they form a mitochondrial anchoring platform that recruits and retains the piRNA biogenesis factor Armitage (Armi) proximal to Zucchini for piRNA processing; Gasz is essential for Zucchini-mediated piRNA production and correct localization of Armi.\",\n      \"method\": \"Co-immunoprecipitation, genetic loss-of-function (Drosophila), immunofluorescence localization, small RNA sequencing\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP establishing Gasz-Daed interaction, Drosophila genetic loss-of-function with defined piRNA biogenesis phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"31123065\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ASZ1/GASZ is a germ cell-specific protein that localizes to intermitochondrial cement (nuage) and the outer mitochondrial membrane via a functional mitochondrial targeting signal; it stabilizes the piRNA pathway protein MILI in nuage, promotes mitofusin-dependent mitochondrial fusion, and, together with its binding partner Daedalus, forms a mitochondrial anchoring platform that recruits Armitage to present piRNA precursors to the Zucchini processing machinery, thereby being essential for piRNA biogenesis, transposon silencing, and male fertility.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ASZ1 (GASZ) is a germ cell-specific protein essential for piRNA biogenesis, transposon silencing, and fertility [#2]. It localizes to the outer mitochondrial membrane through a functional mitochondrial targeting signal and self-associates there, promoting mitofusin-dependent mitochondrial fusion and clustering; this mitochondrial localization is required for nuage (intermitochondrial cement) formation, transposon repression, and spermatogenesis [#3]. Within nuage, ASZ1 co-localizes with and stabilizes the piRNA pathway protein MILI, and its loss causes MILI downregulation, global piRNA depletion, retrotransposon derepression and hypomethylation, and a zygotene-pachytene spermatocyte arrest [#2]. Mechanistically, ASZ1 acts as a mitochondrial anchoring platform: together with its binding partner Daedalus it recruits and retains the piRNA biogenesis factor Armitage near the Zucchini processing machinery, making it essential for Zucchini-mediated piRNA production [#4]. The protein architecture comprises ankyrin repeats, a SAM domain, and a bZIP domain, consistent with a scaffolding role in protein-protein interactions [#0].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established ASZ1/GASZ as a previously unknown germ cell-specific cytoplasmic protein with a domain architecture (ankyrin/SAM/bZIP) suited to mediating protein-protein interactions during germ cell maturation.\",\n      \"evidence\": \"In silico subtraction with Northern blot, RT-PCR, in situ hybridization, and immunohistochemistry in germ cells\",\n      \"pmids\": [\"12040005\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional loss-of-function tested\", \"No binding partners identified\", \"Subcellular localization defined only as cytoplasmic\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed the germ cell-specific expression and cytoplasmic localization are evolutionarily conserved across vertebrates, hinting at a conserved germline function.\",\n      \"evidence\": \"cDNA cloning, Northern/Western blot, ISH and IHC across pufferfish, zebrafish, and frog\",\n      \"pmids\": [\"14766731\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Descriptive localization only, no functional consequence established\", \"Balbiani body association not mechanistically linked to any pathway\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined ASZ1's essential function in the piRNA pathway by showing it stabilizes MILI in nuage and is required for transposon silencing and male fertility.\",\n      \"evidence\": \"Gasz knockout mouse with co-localization, Western blot, small RNA-seq, and bisulfite sequencing\",\n      \"pmids\": [\"19730684\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how ASZ1 physically stabilizes MILI\", \"Subcellular anchoring mechanism not yet resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved the subcellular basis of ASZ1 function, showing it targets the outer mitochondrial membrane, self-associates, drives mitofusin-dependent mitochondrial fusion, and that this localization is required for nuage formation and spermatogenesis.\",\n      \"evidence\": \"Ectopic expression with live imaging/fractionation, self co-IP, and a mitochondrial targeting signal deletion mouse model with confocal imaging and transposon assays\",\n      \"pmids\": [\"26711429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between mitochondrial fusion and piRNA processing not detailed\", \"Partners bridging the mitochondrial platform to processing enzymes not identified in this study\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified the molecular mechanism by which ASZ1 organizes piRNA biogenesis: with Daedalus it forms a mitochondrial anchoring platform recruiting Armitage to the Zucchini processing machinery.\",\n      \"evidence\": \"Reciprocal co-IP, Drosophila genetic loss-of-function, immunofluorescence localization, and small RNA sequencing\",\n      \"pmids\": [\"31123065\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"A direct mammalian counterpart of the Gasz-Daedalus-Armitage axis not confirmed in mouse\", \"Structural basis of the anchoring platform unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the ASZ1 mitochondrial scaffold mechanistically couples mitochondrial fusion to nuage assembly and piRNA precursor presentation at the molecular and structural level remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of the ASZ1 anchoring platform\", \"Mechanism by which mitochondrial fusion supports piRNA processing unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0005741\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"complexes\": [\"intermitochondrial cement (nuage)\"],\n    \"partners\": [\"MILI\", \"Daedalus\", \"Armitage\", \"MFN\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}