{"gene":"ZAN","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2010,"finding":"Zonadhesin (ZAN) confers species specificity to sperm-zona pellucida (ZP) adhesion. Using Zan knockout mice, sperm capacitation was shown to selectively expose a partial von Willebrand D domain of mouse zonadhesin on the surface of living, motile cells. Antibodies to the exposed domain inhibited wild-type spermatozoa adhesion to mouse ZP but not Zan-/- spermatozoa. Loss of zonadhesin paradoxically increased adhesion of mouse spermatozoa to heterologous ZP (pig, cow, rabbit) but not mouse ZP, demonstrating that zonadhesin mediates species-specific ZP adhesion rather than general adhesion.","method":"Targeted gene disruption (Zan knockout mice), antibody inhibition assays, in vitro fertilization, live-cell imaging of capacitated sperm","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — clean KO with defined cellular phenotype, multiple orthogonal assays including antibody inhibition and cross-species ZP binding, replicated in vitro and in vivo","pmids":["20529856"],"is_preprint":false},{"year":2006,"finding":"VWD domains (especially VWD2), membrane/A5 antigen mu receptor, and mucin-like domains of zonadhesin are under rapid positive (adaptive) selection in primates, indicating these domains are involved in species-specific zona pellucida binding. Population genetic analysis also revealed signatures of both balancing selection and positive selection within human ZAN populations.","method":"Maximum-likelihood phylogenetic analysis of 47 coding exons across 12 primate species; polymorphism analysis in 48 human individuals","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — multi-species sequence analysis with statistical methods, but no direct functional binding assay in this paper","pmids":["17033959"],"is_preprint":false},{"year":1997,"finding":"The human zonadhesin gene (ZAN) maps to chromosome 7, in a position near the egg extracellular matrix protein ZP3 gene; the mouse ortholog (Zan) maps to chromosome 5.","method":"Chromosomal mapping/genomics","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — direct chromosomal mapping experiment, single lab","pmids":["9126492"],"is_preprint":false},{"year":2001,"finding":"ZAN (zonadhesin) was identified as part of a conserved syntenic gene block on human chromosome 7q22 and mouse chromosome 5, flanked by ACHE and TFR2/Tfr2, establishing the genomic organization and conservation of the ZAN locus.","method":"Comparative genomic sequencing of BAC clones, physical mapping","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — direct comparative genomic sequencing with functional annotation","pmids":["11239002"],"is_preprint":false},{"year":2005,"finding":"Zonadhesin-like genes in fish (zebrafish, pufferfish, Atlantic salmon) share MAM, mucin, and VWD domain architecture with mammalian zonadhesin, but in fish they are expressed in the gut rather than the testes, suggesting the reproductive role of zonadhesin evolved in the mammalian lineage.","method":"cDNA sequencing, genomic locus analysis, expression profiling by RT-PCR in multiple tissues","journal":"BMC genomics","confidence":"Medium","confidence_rationale":"Tier 2 — multi-species expression and genomic analysis, but functional binding not directly tested in fish","pmids":["16303057"],"is_preprint":false},{"year":2015,"finding":"Zonadhesin (ZAN) is present in high molecular weight (HMW) complexes on the anterior sperm head plasma membrane of capacitated spermatozoa, and immunoprecipitation shows ZAN interacts with other acrosomal proteins proacrosin/acrosin and sp32 (ACRBP) within these complexes. Both ZAN and proacrosin/acrosin traffic to the sperm head surface during capacitation while the acrosomal matrix is intact, consistent with a role in initial sperm-ZP binding.","method":"Immunoprecipitation, co-immunoprecipitation, immunodetection (localization studies during capacitation)","journal":"Asian journal of andrology","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP identifies binding partners, supported by localization data, single lab","pmids":["25994642"],"is_preprint":false},{"year":2022,"finding":"Zan encodes the sperm acrosomal protein zonadhesin that mediates species-specific adhesion to the egg's zona pellucida and acts as a speciation gene in placental mammals. A 112-species Zan sequence phylogeny resolves all species into monophyletic groups corresponding to recognized Orders/Suborders, with divergence driven by intense positive selection. Ordinal divergence rates generally reflect species richness, consistent with Zan functioning as a speciation gene across Eutheria.","method":"Multi-species genomic phylogenetic analysis (112 species, 17 of 19 placental Orders), comparative positive selection analysis, comparison with other rapidly evolving genes","journal":"Genome biology","confidence":"High","confidence_rationale":"Tier 2 — large multi-species comparative genomic study with multiple evolutionary analyses, mechanistic role in sperm-egg recognition directly supported by prior KO experiments","pmids":["35821049"],"is_preprint":false},{"year":2018,"finding":"Testisin (PRSS21) in stallion spermatozoa forms multiprotein complexes and co-immunoprecipitates with ZAN and other zona pellucida-binding proteins (ZPBP, acrosin, heat-shock proteins, TCP1 complex components), indicating ZAN participates in a zona pellucida-binding complex on the sperm surface.","method":"Blue Native PAGE, co-immunoprecipitation, mass spectrometry, live cell immunofluorescence","journal":"Andrology","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP and MS identify ZAN as part of a multiprotein complex; functional consequence not directly tested for ZAN specifically","pmids":["30549223"],"is_preprint":false},{"year":2023,"finding":"During bull sperm capacitation, ZAN (zona-pellucida binding protein) undergoes reversible oxidative post-translational modifications including S-nitrosylation and S-glutathionylation. Inhibition of peroxiredoxin (PRDX) activity during capacitation increased these oxidative PTMs, suggesting PRDXs regulate the redox status of ZAN and other ZP-binding proteins during capacitation, which may determine sperm-oocyte interaction.","method":"Fluorescent gel-based proteomics, flow cytometry, fluorescence microscopy, PRDX inhibitor treatment","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2-3 — proteomic identification of PTMs on ZAN with pharmacological perturbation, single lab","pmids":["37046330"],"is_preprint":false},{"year":2022,"finding":"Zonadhesin (ZAN) in the sperm acrosome displays properties of a sequestered antigen under normal conditions. However, when ZAN and other sperm antigens are exposed by vasectomy, they rapidly induce testis antigen-specific tolerance dependent on regulatory T cells (Tregs). Partial Treg depletion after vasectomy leads to bilateral experimental autoimmune orchitis (EAO) and ZAN antibody response, establishing ZAN as a target antigen capable of orchestrating de novo Treg-dependent systemic tolerance.","method":"DEREG mouse model (diphtheria toxin-mediated Treg depletion), vasectomy model, antibody detection, EAO phenotype assessment","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic mouse model with clear cellular phenotype linked to ZAN antigen exposure, single lab","pmids":["35693780"],"is_preprint":false}],"current_model":"Zonadhesin (ZAN) is a mosaic sperm acrosomal protein containing VWD, MAM, and mucin domains that undergoes exposure on the sperm head surface during capacitation (via a partial von Willebrand D domain) and mediates species-specific adhesion to the egg zona pellucida by interacting with ZP in a species-selective manner; it forms high-molecular-weight complexes with acrosomal proteins (proacrosin/acrosin, ACRBP) on the sperm surface, undergoes reversible oxidative PTMs (S-nitrosylation, S-glutathionylation) regulated by peroxiredoxins during capacitation, and its rapid positive selection across Eutheria underlies its role as a prezygotic reproductive isolation/speciation gene."},"narrative":{"teleology":[{"year":1997,"claim":"Establishing the genomic position of ZAN on human chromosome 7 and mouse chromosome 5 provided the first framework for studying its regulation and evolutionary linkage to zona pellucida genes.","evidence":"Chromosomal mapping of ZAN in human and mouse","pmids":["9126492"],"confidence":"Medium","gaps":["No functional data on ZAN protein at this stage","Expression pattern not yet characterized","Relationship to ZP3 (nearby gene) not functionally explored"]},{"year":2001,"claim":"Comparative genomic sequencing defined ZAN within a conserved syntenic block flanked by ACHE and TFR2, establishing genomic organization and cross-species conservation of the locus.","evidence":"BAC clone sequencing and physical mapping in human and mouse","pmids":["11239002"],"confidence":"Medium","gaps":["No protein-level functional studies","Gene structure characterized but domain function untested"]},{"year":2005,"claim":"Discovery that fish zonadhesin-like genes share domain architecture but are expressed in gut rather than testes established that the reproductive role of zonadhesin is a mammalian innovation, separating ancestral function from its sperm-specific role.","evidence":"cDNA sequencing and RT-PCR expression profiling across tissues in zebrafish, pufferfish, and salmon","pmids":["16303057"],"confidence":"Medium","gaps":["No direct functional binding assay in fish","Ancestral gut function not characterized","Mechanism of transition to reproductive expression unknown"]},{"year":2006,"claim":"Identification of strong positive selection on VWD, MAM, and mucin domains across primates provided the first molecular evolutionary evidence that these specific domains drive species-specific zona pellucida recognition.","evidence":"Maximum-likelihood phylogenetic analysis across 12 primate species and polymorphism analysis in 48 humans","pmids":["17033959"],"confidence":"Medium","gaps":["No direct binding experiments mapping domains to ZP interaction","Population-level balancing selection signals not functionally explained"]},{"year":2010,"claim":"The Zan knockout mouse demonstrated that zonadhesin mediates species-specific rather than general zona adhesion, resolving the central question of its biological function: loss of ZAN increased cross-species but not conspecific ZP binding, and a partial VWD domain was identified as the capacitation-exposed surface epitope.","evidence":"Targeted gene disruption in mice, antibody inhibition of sperm-ZP adhesion, cross-species IVF binding assays, live-cell imaging","pmids":["20529856"],"confidence":"High","gaps":["Specific ZP ligand(s) for zonadhesin not identified","Structural basis for species selectivity not resolved","In vivo reproductive isolation phenotype in natural populations not tested"]},{"year":2015,"claim":"Identification of ZAN in high-molecular-weight surface complexes with proacrosin/acrosin and ACRBP on capacitated sperm heads revealed that zonadhesin does not act alone but as part of a multiprotein zona-binding machinery assembled during capacitation.","evidence":"Co-immunoprecipitation and immunodetection on capacitated spermatozoa","pmids":["25994642"],"confidence":"Medium","gaps":["Reciprocal co-IP not fully validated across species","Stoichiometry and architecture of the complex undefined","Functional contribution of each component to species-specific binding unknown"]},{"year":2018,"claim":"Co-immunoprecipitation of ZAN with testisin (PRSS21), ZPBP, acrosin, and chaperone components in stallion sperm extended the ZP-binding complex model to equine species and implicated additional partners including a serine protease and protein folding machinery.","evidence":"Blue Native PAGE, co-IP, mass spectrometry, and live-cell immunofluorescence in stallion spermatozoa","pmids":["30549223"],"confidence":"Medium","gaps":["ZAN's specific contribution to complex function not dissected","Direct binding between ZAN and testisin not confirmed by orthogonal methods","Species-specificity of complex composition not systematically compared"]},{"year":2022,"claim":"A 112-species phylogeny built from Zan sequences resolved all placental mammals into monophyletic groups matching recognized orders, and divergence rates correlated with species richness, establishing zonadhesin as a bona fide speciation gene across Eutheria.","evidence":"Comparative genomic phylogenetic analysis across 17 of 19 placental mammalian orders with positive selection analysis","pmids":["35821049"],"confidence":"High","gaps":["Causal link between Zan sequence divergence and reproductive isolation not experimentally demonstrated between closely related species","Contribution of individual domain substitutions to binding specificity unknown"]},{"year":2022,"claim":"ZAN was identified as a sequestered testis antigen that, upon exposure after vasectomy, drives de novo Treg-dependent systemic immune tolerance, establishing an immunological dimension to zonadhesin biology beyond fertilization.","evidence":"DEREG mouse model with diphtheria toxin-mediated Treg depletion, vasectomy, antibody detection, and experimental autoimmune orchitis phenotyping","pmids":["35693780"],"confidence":"Medium","gaps":["Whether anti-ZAN antibodies functionally impair fertility not tested","Epitopes targeted by the autoimmune response not mapped","Relevance to human post-vasectomy immune response not established"]},{"year":2023,"claim":"Demonstration that ZAN undergoes reversible S-nitrosylation and S-glutathionylation during capacitation, regulated by peroxiredoxins, linked redox signaling to the functional state of the zona-binding protein and suggested a regulatory layer controlling sperm-oocyte interaction competence.","evidence":"Fluorescent gel-based proteomics, flow cytometry, fluorescence microscopy, and PRDX inhibitor treatment in bull spermatozoa","pmids":["37046330"],"confidence":"Medium","gaps":["Functional consequence of specific oxidative PTMs on ZAN binding activity not measured","Sites of modification not mapped at residue level","Whether redox regulation is conserved across species unknown"]},{"year":null,"claim":"The identity of the zona pellucida glycoprotein(s) that serve as the cognate receptor for zonadhesin remains unknown, and no structural model explains how domain-level sequence divergence encodes species-specific binding selectivity.","evidence":"","pmids":[],"confidence":"Low","gaps":["No ZP ligand for ZAN identified by direct binding","No crystal or cryo-EM structure of zonadhesin or its ZP-binding domains","Mechanism by which positive selection alters binding specificity is entirely unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,6]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,5]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,5]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,6]}],"complexes":[],"partners":["ACR","ACRBP","PRSS21","ZPBP"],"other_free_text":[]},"mechanistic_narrative":"Zonadhesin (ZAN) is a rapidly evolving, mosaic sperm acrosomal protein that mediates species-specific adhesion to the egg zona pellucida and functions as a prezygotic reproductive isolation gene across placental mammals. During capacitation, a partial von Willebrand D domain of zonadhesin is exposed on the anterior sperm head surface, where it participates in high-molecular-weight complexes with proacrosin/acrosin and ACRBP to mediate initial zona pellucida binding; loss of zonadhesin in knockout mice increases heterologous but not conspecific zona adhesion, directly demonstrating its role in species-selective recognition [PMID:20529856, PMID:25994642]. The VWD, MAM, and mucin domains of zonadhesin are under intense positive selection across Eutheria, with ordinal divergence rates correlating with species richness, consistent with its function as a speciation gene [PMID:35821049, PMID:17033959]. Zonadhesin undergoes reversible S-nitrosylation and S-glutathionylation during capacitation under the regulation of peroxiredoxins, linking redox signaling to sperm–zona pellucida interaction competence [PMID:37046330]."},"prefetch_data":{"uniprot":{"accession":"Q9Y493","full_name":"Zonadhesin","aliases":[],"length_aa":2812,"mass_kda":305.6,"function":"Binds in a species-specific manner to the zona pellucida of the egg. May be involved in gamete recognition and/or signaling","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y493/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZAN","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":74,"dependency_fraction":0.013513513513513514},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ZAN","total_profiled":1310},"omim":[{"mim_id":"621325","title":"VERVERI-BRADY SYNDROME 2; VERBRAS2","url":"https://www.omim.org/entry/621325"},{"mim_id":"619289","title":"ZINC FINGER PROTEIN 91, ATYPICAL E3 UBIQUITIN LIGASE; ZFP91","url":"https://www.omim.org/entry/619289"},{"mim_id":"617982","title":"VERVERI-BRADY SYNDROME 1; VERBRAS1","url":"https://www.omim.org/entry/617982"},{"mim_id":"617387","title":"GLUTAMINE-RICH PROTEIN 1; QRICH1","url":"https://www.omim.org/entry/617387"},{"mim_id":"613928","title":"MUCIN-LIKE 3; MUCL3","url":"https://www.omim.org/entry/613928"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Not detected","tissue_distribution":"Not detected","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ZAN"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9Y493","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y493","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y493-5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y493-5-F1-predicted_aligned_error_v6.png","plddt_mean":64.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZAN","jax_strain_url":"https://www.jax.org/strain/search?query=ZAN"},"sequence":{"accession":"Q9Y493","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y493.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y493/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y493"}},"corpus_meta":[{"pmid":"15753317","id":"PMC_15753317","title":"The Anopheles gambiae detoxification chip: a highly specific microarray to study metabolic-based insecticide resistance in malaria 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Using Zan knockout mice, sperm capacitation was shown to selectively expose a partial von Willebrand D domain of mouse zonadhesin on the surface of living, motile cells. Antibodies to the exposed domain inhibited wild-type spermatozoa adhesion to mouse ZP but not Zan-/- spermatozoa. Loss of zonadhesin paradoxically increased adhesion of mouse spermatozoa to heterologous ZP (pig, cow, rabbit) but not mouse ZP, demonstrating that zonadhesin mediates species-specific ZP adhesion rather than general adhesion.\",\n      \"method\": \"Targeted gene disruption (Zan knockout mice), antibody inhibition assays, in vitro fertilization, live-cell imaging of capacitated sperm\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — clean KO with defined cellular phenotype, multiple orthogonal assays including antibody inhibition and cross-species ZP binding, replicated in vitro and in vivo\",\n      \"pmids\": [\"20529856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"VWD domains (especially VWD2), membrane/A5 antigen mu receptor, and mucin-like domains of zonadhesin are under rapid positive (adaptive) selection in primates, indicating these domains are involved in species-specific zona pellucida binding. Population genetic analysis also revealed signatures of both balancing selection and positive selection within human ZAN populations.\",\n      \"method\": \"Maximum-likelihood phylogenetic analysis of 47 coding exons across 12 primate species; polymorphism analysis in 48 human individuals\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multi-species sequence analysis with statistical methods, but no direct functional binding assay in this paper\",\n      \"pmids\": [\"17033959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The human zonadhesin gene (ZAN) maps to chromosome 7, in a position near the egg extracellular matrix protein ZP3 gene; the mouse ortholog (Zan) maps to chromosome 5.\",\n      \"method\": \"Chromosomal mapping/genomics\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct chromosomal mapping experiment, single lab\",\n      \"pmids\": [\"9126492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ZAN (zonadhesin) was identified as part of a conserved syntenic gene block on human chromosome 7q22 and mouse chromosome 5, flanked by ACHE and TFR2/Tfr2, establishing the genomic organization and conservation of the ZAN locus.\",\n      \"method\": \"Comparative genomic sequencing of BAC clones, physical mapping\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct comparative genomic sequencing with functional annotation\",\n      \"pmids\": [\"11239002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Zonadhesin-like genes in fish (zebrafish, pufferfish, Atlantic salmon) share MAM, mucin, and VWD domain architecture with mammalian zonadhesin, but in fish they are expressed in the gut rather than the testes, suggesting the reproductive role of zonadhesin evolved in the mammalian lineage.\",\n      \"method\": \"cDNA sequencing, genomic locus analysis, expression profiling by RT-PCR in multiple tissues\",\n      \"journal\": \"BMC genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multi-species expression and genomic analysis, but functional binding not directly tested in fish\",\n      \"pmids\": [\"16303057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Zonadhesin (ZAN) is present in high molecular weight (HMW) complexes on the anterior sperm head plasma membrane of capacitated spermatozoa, and immunoprecipitation shows ZAN interacts with other acrosomal proteins proacrosin/acrosin and sp32 (ACRBP) within these complexes. Both ZAN and proacrosin/acrosin traffic to the sperm head surface during capacitation while the acrosomal matrix is intact, consistent with a role in initial sperm-ZP binding.\",\n      \"method\": \"Immunoprecipitation, co-immunoprecipitation, immunodetection (localization studies during capacitation)\",\n      \"journal\": \"Asian journal of andrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP identifies binding partners, supported by localization data, single lab\",\n      \"pmids\": [\"25994642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Zan encodes the sperm acrosomal protein zonadhesin that mediates species-specific adhesion to the egg's zona pellucida and acts as a speciation gene in placental mammals. A 112-species Zan sequence phylogeny resolves all species into monophyletic groups corresponding to recognized Orders/Suborders, with divergence driven by intense positive selection. Ordinal divergence rates generally reflect species richness, consistent with Zan functioning as a speciation gene across Eutheria.\",\n      \"method\": \"Multi-species genomic phylogenetic analysis (112 species, 17 of 19 placental Orders), comparative positive selection analysis, comparison with other rapidly evolving genes\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large multi-species comparative genomic study with multiple evolutionary analyses, mechanistic role in sperm-egg recognition directly supported by prior KO experiments\",\n      \"pmids\": [\"35821049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Testisin (PRSS21) in stallion spermatozoa forms multiprotein complexes and co-immunoprecipitates with ZAN and other zona pellucida-binding proteins (ZPBP, acrosin, heat-shock proteins, TCP1 complex components), indicating ZAN participates in a zona pellucida-binding complex on the sperm surface.\",\n      \"method\": \"Blue Native PAGE, co-immunoprecipitation, mass spectrometry, live cell immunofluorescence\",\n      \"journal\": \"Andrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP and MS identify ZAN as part of a multiprotein complex; functional consequence not directly tested for ZAN specifically\",\n      \"pmids\": [\"30549223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"During bull sperm capacitation, ZAN (zona-pellucida binding protein) undergoes reversible oxidative post-translational modifications including S-nitrosylation and S-glutathionylation. Inhibition of peroxiredoxin (PRDX) activity during capacitation increased these oxidative PTMs, suggesting PRDXs regulate the redox status of ZAN and other ZP-binding proteins during capacitation, which may determine sperm-oocyte interaction.\",\n      \"method\": \"Fluorescent gel-based proteomics, flow cytometry, fluorescence microscopy, PRDX inhibitor treatment\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — proteomic identification of PTMs on ZAN with pharmacological perturbation, single lab\",\n      \"pmids\": [\"37046330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Zonadhesin (ZAN) in the sperm acrosome displays properties of a sequestered antigen under normal conditions. However, when ZAN and other sperm antigens are exposed by vasectomy, they rapidly induce testis antigen-specific tolerance dependent on regulatory T cells (Tregs). Partial Treg depletion after vasectomy leads to bilateral experimental autoimmune orchitis (EAO) and ZAN antibody response, establishing ZAN as a target antigen capable of orchestrating de novo Treg-dependent systemic tolerance.\",\n      \"method\": \"DEREG mouse model (diphtheria toxin-mediated Treg depletion), vasectomy model, antibody detection, EAO phenotype assessment\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic mouse model with clear cellular phenotype linked to ZAN antigen exposure, single lab\",\n      \"pmids\": [\"35693780\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Zonadhesin (ZAN) is a mosaic sperm acrosomal protein containing VWD, MAM, and mucin domains that undergoes exposure on the sperm head surface during capacitation (via a partial von Willebrand D domain) and mediates species-specific adhesion to the egg zona pellucida by interacting with ZP in a species-selective manner; it forms high-molecular-weight complexes with acrosomal proteins (proacrosin/acrosin, ACRBP) on the sperm surface, undergoes reversible oxidative PTMs (S-nitrosylation, S-glutathionylation) regulated by peroxiredoxins during capacitation, and its rapid positive selection across Eutheria underlies its role as a prezygotic reproductive isolation/speciation gene.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"Zonadhesin (ZAN) is a rapidly evolving, mosaic sperm acrosomal protein that mediates species-specific adhesion to the egg zona pellucida and functions as a prezygotic reproductive isolation gene across placental mammals. During capacitation, a partial von Willebrand D domain of zonadhesin is exposed on the anterior sperm head surface, where it participates in high-molecular-weight complexes with proacrosin/acrosin and ACRBP to mediate initial zona pellucida binding; loss of zonadhesin in knockout mice increases heterologous but not conspecific zona adhesion, directly demonstrating its role in species-selective recognition [PMID:20529856, PMID:25994642]. The VWD, MAM, and mucin domains of zonadhesin are under intense positive selection across Eutheria, with ordinal divergence rates correlating with species richness, consistent with its function as a speciation gene [PMID:35821049, PMID:17033959]. Zonadhesin undergoes reversible S-nitrosylation and S-glutathionylation during capacitation under the regulation of peroxiredoxins, linking redox signaling to sperm–zona pellucida interaction competence [PMID:37046330].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing the genomic position of ZAN on human chromosome 7 and mouse chromosome 5 provided the first framework for studying its regulation and evolutionary linkage to zona pellucida genes.\",\n      \"evidence\": \"Chromosomal mapping of ZAN in human and mouse\",\n      \"pmids\": [\"9126492\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional data on ZAN protein at this stage\",\n        \"Expression pattern not yet characterized\",\n        \"Relationship to ZP3 (nearby gene) not functionally explored\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Comparative genomic sequencing defined ZAN within a conserved syntenic block flanked by ACHE and TFR2, establishing genomic organization and cross-species conservation of the locus.\",\n      \"evidence\": \"BAC clone sequencing and physical mapping in human and mouse\",\n      \"pmids\": [\"11239002\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No protein-level functional studies\",\n        \"Gene structure characterized but domain function untested\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Discovery that fish zonadhesin-like genes share domain architecture but are expressed in gut rather than testes established that the reproductive role of zonadhesin is a mammalian innovation, separating ancestral function from its sperm-specific role.\",\n      \"evidence\": \"cDNA sequencing and RT-PCR expression profiling across tissues in zebrafish, pufferfish, and salmon\",\n      \"pmids\": [\"16303057\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No direct functional binding assay in fish\",\n        \"Ancestral gut function not characterized\",\n        \"Mechanism of transition to reproductive expression unknown\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of strong positive selection on VWD, MAM, and mucin domains across primates provided the first molecular evolutionary evidence that these specific domains drive species-specific zona pellucida recognition.\",\n      \"evidence\": \"Maximum-likelihood phylogenetic analysis across 12 primate species and polymorphism analysis in 48 humans\",\n      \"pmids\": [\"17033959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No direct binding experiments mapping domains to ZP interaction\",\n        \"Population-level balancing selection signals not functionally explained\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The Zan knockout mouse demonstrated that zonadhesin mediates species-specific rather than general zona adhesion, resolving the central question of its biological function: loss of ZAN increased cross-species but not conspecific ZP binding, and a partial VWD domain was identified as the capacitation-exposed surface epitope.\",\n      \"evidence\": \"Targeted gene disruption in mice, antibody inhibition of sperm-ZP adhesion, cross-species IVF binding assays, live-cell imaging\",\n      \"pmids\": [\"20529856\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific ZP ligand(s) for zonadhesin not identified\",\n        \"Structural basis for species selectivity not resolved\",\n        \"In vivo reproductive isolation phenotype in natural populations not tested\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of ZAN in high-molecular-weight surface complexes with proacrosin/acrosin and ACRBP on capacitated sperm heads revealed that zonadhesin does not act alone but as part of a multiprotein zona-binding machinery assembled during capacitation.\",\n      \"evidence\": \"Co-immunoprecipitation and immunodetection on capacitated spermatozoa\",\n      \"pmids\": [\"25994642\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Reciprocal co-IP not fully validated across species\",\n        \"Stoichiometry and architecture of the complex undefined\",\n        \"Functional contribution of each component to species-specific binding unknown\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Co-immunoprecipitation of ZAN with testisin (PRSS21), ZPBP, acrosin, and chaperone components in stallion sperm extended the ZP-binding complex model to equine species and implicated additional partners including a serine protease and protein folding machinery.\",\n      \"evidence\": \"Blue Native PAGE, co-IP, mass spectrometry, and live-cell immunofluorescence in stallion spermatozoa\",\n      \"pmids\": [\"30549223\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"ZAN's specific contribution to complex function not dissected\",\n        \"Direct binding between ZAN and testisin not confirmed by orthogonal methods\",\n        \"Species-specificity of complex composition not systematically compared\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A 112-species phylogeny built from Zan sequences resolved all placental mammals into monophyletic groups matching recognized orders, and divergence rates correlated with species richness, establishing zonadhesin as a bona fide speciation gene across Eutheria.\",\n      \"evidence\": \"Comparative genomic phylogenetic analysis across 17 of 19 placental mammalian orders with positive selection analysis\",\n      \"pmids\": [\"35821049\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Causal link between Zan sequence divergence and reproductive isolation not experimentally demonstrated between closely related species\",\n        \"Contribution of individual domain substitutions to binding specificity unknown\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"ZAN was identified as a sequestered testis antigen that, upon exposure after vasectomy, drives de novo Treg-dependent systemic immune tolerance, establishing an immunological dimension to zonadhesin biology beyond fertilization.\",\n      \"evidence\": \"DEREG mouse model with diphtheria toxin-mediated Treg depletion, vasectomy, antibody detection, and experimental autoimmune orchitis phenotyping\",\n      \"pmids\": [\"35693780\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether anti-ZAN antibodies functionally impair fertility not tested\",\n        \"Epitopes targeted by the autoimmune response not mapped\",\n        \"Relevance to human post-vasectomy immune response not established\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstration that ZAN undergoes reversible S-nitrosylation and S-glutathionylation during capacitation, regulated by peroxiredoxins, linked redox signaling to the functional state of the zona-binding protein and suggested a regulatory layer controlling sperm-oocyte interaction competence.\",\n      \"evidence\": \"Fluorescent gel-based proteomics, flow cytometry, fluorescence microscopy, and PRDX inhibitor treatment in bull spermatozoa\",\n      \"pmids\": [\"37046330\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional consequence of specific oxidative PTMs on ZAN binding activity not measured\",\n        \"Sites of modification not mapped at residue level\",\n        \"Whether redox regulation is conserved across species unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the zona pellucida glycoprotein(s) that serve as the cognate receptor for zonadhesin remains unknown, and no structural model explains how domain-level sequence divergence encodes species-specific binding selectivity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No ZP ligand for ZAN identified by direct binding\",\n        \"No crystal or cryo-EM structure of zonadhesin or its ZP-binding domains\",\n        \"Mechanism by which positive selection alters binding specificity is entirely unresolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ACR\",\n      \"ACRBP\",\n      \"PRSS21\",\n      \"ZPBP\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}