{"gene":"ZPBP2","run_date":"2026-06-11T09:02:07","timeline":{"discoveries":[{"year":2007,"finding":"ZPBP2 (Zpbp2) plays a structural role during spermiogenesis; male mice null for Zpbp2 are subfertile, exhibit aberrant acrosomal membrane invaginations, and produce dysmorphic sperm with reduced ability to penetrate the zona pellucida, demonstrating that ZPBP2 is required for proper acrosome biogenesis.","method":"Zpbp2 knockout mouse model with fertility assays, sperm morphology analysis, and ultrastructural studies","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular phenotype (subfertility, acrosome defects, zona penetration failure), ultrastructural validation, replicated in context of ZPBP1 KO comparison in same study","pmids":["17664285"],"is_preprint":false},{"year":2011,"finding":"ZPBP2 is a component of high-molecular-weight protein complexes on the human sperm surface that display affinity for homologous zonae pellucidae; specifically, ZPBP2 was identified as a component of the chaperonin-containing TCP-1 (CCT) complex on sperm, and antibodies against complex subunits inhibited sperm binding to zona-intact oocytes.","method":"Blue native PAGE, electrospray ionization mass spectrometry proteomics, western blotting, antibody inhibition of sperm-zona binding","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (BN-PAGE, MS, functional antibody inhibition) in single lab; ZPBP2 identified as component of CCT complex with zona affinity","pmids":["21672535"],"is_preprint":false},{"year":2017,"finding":"ZPBP2 contains a Link-like hyaluronic acid (HA)-binding domain and partitions exclusively into the HA-binding fraction from human sperm lysates, suggesting it may function as a hyaladherin in sperm-oocyte interaction.","method":"Protein affinity panning with HA substrate, LC-MS/MS proteomics, western blotting, structural homology analysis via PDBsum","journal":"Molecular human reproduction","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single affinity partitioning method with acknowledged limitations (expected hyaladherins CD44 and RHAMM not detected), structural inference only","pmids":["29126140"],"is_preprint":false},{"year":2018,"finding":"Deletion of the mouse Zpbp2 gene attenuates airway hypersensitivity (AHR) in female but not male mice in the absence of allergic sensitization, and is associated with significantly lower levels of sphingosine-1-phosphate (S1P) and very long-chain ceramides (VLCCs), and higher levels of long-chain ceramides in female KO lungs; lung resistance correlated with lung S1P levels, suggesting Zpbp2 regulates AHR through ceramide/sphingolipid metabolism in a sex-dependent manner.","method":"Zpbp2 knockout mouse model, methacholine challenge (AHR measurement), lipidomics (sphingolipid profiling of lung, liver, spleen, plasma), Pearson correlation analysis","journal":"Mammalian genome","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined physiological phenotype plus lipidomic profiling providing mechanistic link to sphingolipid metabolism; single lab but multiple orthogonal readouts","pmids":["29536159"],"is_preprint":false},{"year":2019,"finding":"Zpbp2 and Ormdl3 expression are regulated by the circadian clock in a tissue-specific fashion in mice; deletion of the Zpbp2 genomic region alters the expression profile of the core clock gene Nr1d1 in lungs and ileum in a time-dependent manner, and is associated with enhanced Ormdl3 expression in liver, indicating the Zpbp2 locus contains cis-regulatory elements that influence circadian clock gene expression.","method":"Zpbp2 KO mouse model, diurnal gene expression profiling (RT-qPCR) across tissues, comparison of Nr1d1 and Ormdl3 expression between KO and WT at multiple time points","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined transcriptional phenotype across multiple tissues and time points; single lab, mechanistic link between Zpbp2 region and circadian/clock gene regulation","pmids":["31560728"],"is_preprint":false},{"year":2020,"finding":"Zpbp2 KO mice express lower levels of Ormdl3 mRNA than WT mice; in allergic asthma (HDM model), lower Ormdl3 expression in Zpbp2 KO mice was associated with lower AHR, but KO mice were not protected from inflammatory cell infiltration, mucus accumulation, or aberrant ceramide levels, indicating ZPBP2 influences Ormdl3 expression and AHR but not all allergic inflammatory phenotypes.","method":"Zpbp2 KO mouse model, HDM-induced allergic asthma model, RT-qPCR (Ormdl3 expression), AHR measurement, histological analysis, ceramide level measurement","journal":"The Journal of pharmacology and experimental therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with multiple defined phenotypic readouts separating Zpbp2-dependent from Zpbp2-independent effects; single lab","pmids":["32273303"],"is_preprint":false},{"year":2022,"finding":"PRSS54 interacts with acrosomal proteins ZPBP1, ZPBP2, ACRBP, and ZP3R in testis and sperm; loss of PRSS54 disrupts the distribution of ZPBP2 (and other acrosomal proteins) in testis and sperm without affecting their protein levels, placing ZPBP2 as a downstream target of PRSS54-mediated acrosomal organization.","method":"Co-immunoprecipitation (interaction of PRSS54 with ZPBP2), Prss54 KO mouse model, immunofluorescence localization of ZPBP2 in KO vs WT","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing physical interaction plus KO showing functional consequence on ZPBP2 localization; single lab","pmids":["35863763"],"is_preprint":false},{"year":2013,"finding":"DNA methylation at a regulatory region within the ZPBP2 gene promoter shows statistically significant sex-specific and age-dependent differences, with higher methylation in adult males vs boys and sex-specific differences between males and females; this region was also identified as containing functionally important polymorphisms influencing expression of neighboring 17q12-q21 genes.","method":"Bisulfite sequencing methylation assay of ZPBP2 promoter region in blood samples stratified by sex and age, TDT genetic association test","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct bisulfite sequencing of ZPBP2 promoter with sex and age stratification; replicated in context of prior functional polymorphism mapping in same region","pmids":["23546690"],"is_preprint":false},{"year":2017,"finding":"Treatment of airway epithelial cells (NuLi-1) with the DNA methyltransferase inhibitor 5-aza-dC causes upregulation of ZPBP2 expression accompanied by a decrease in promoter methylation (8-13% change sufficient to cause substantial RNA level changes); allelic expression of ZPBP2 is modulated by DNA methylation, with different alleles responding differently to demethylation treatment.","method":"5-aza-2'-deoxycytidine treatment of human cell lines (NuLi-1, 293T, MCF-7), RT-qPCR expression analysis, bisulfite sequencing of ZPBP2 promoter methylation, allelic expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological demethylation with matched promoter methylation and expression readouts in multiple cell lines; single lab","pmids":["28241063"],"is_preprint":false},{"year":2003,"finding":"ZPBP2 (originally named ZPBPL/ZPBP-like) encodes a secreted-type glycoprotein with a zona pellucida binding protein homologous (ZPBH) domain containing 15 conserved cysteine residues; the gene consists of seven exons and the protein shares 34.8% amino acid identity with ZPBP1 (a type 2 transmembrane protein), with both co-expressed in testis.","method":"In silico gene identification, bioinformatics domain analysis, cDNA characterization, expression analysis","journal":"International journal of molecular medicine","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational/bioinformatic prediction and expression analysis only; no direct functional experiment","pmids":["12883658"],"is_preprint":false}],"current_model":"ZPBP2 is a secreted glycoprotein with a zona pellucida binding protein homologous (ZPBH) domain that is highly expressed in testes during spermiogenesis; it plays a structural role in acrosome biogenesis and sperm morphogenesis (loss causes subfertility, acrosomal membrane invaginations, and impaired zona penetration), participates in high-molecular-weight sperm surface complexes that bind the zona pellucida, interacts with acrosomal proteins including ZPBP1, ACRBP, and ZP3R (with its localization dependent on PRSS54), and in somatic tissues (particularly lung) influences airway hyperresponsiveness and sphingolipid/ceramide metabolism in a sex-dependent fashion, partly through regulation of Ormdl3 expression; its promoter region is subject to sex- and age-dependent DNA methylation that modulates allele-specific expression, and the Zpbp2 genomic region contains cis-regulatory elements that influence expression of the circadian clock gene Nr1d1."},"narrative":{"mechanistic_narrative":"ZPBP2 is a testis-expressed protein required for acrosome biogenesis and sperm morphogenesis during spermiogenesis: mice lacking Zpbp2 are subfertile, develop aberrant acrosomal membrane invaginations, and produce dysmorphic sperm with impaired ability to penetrate the zona pellucida [PMID:17664285]. Its proper acrosomal distribution depends on PRSS54, which physically interacts with ZPBP2 alongside the acrosomal proteins ZPBP1, ACRBP, and ZP3R; loss of PRSS54 mislocalizes ZPBP2 without changing its abundance, placing ZPBP2 downstream of PRSS54-organized acrosomal architecture [PMID:35863763]. On the human sperm surface ZPBP2 is found within high-molecular-weight complexes with affinity for homologous zonae pellucidae, including association with the chaperonin-containing TCP-1 (CCT) complex, and antibodies against complex subunits block sperm-zona binding [PMID:21672535]. Beyond the male germline, the Zpbp2 locus has a distinct somatic role: deletion of the gene region attenuates airway hyperresponsiveness in a sex-dependent manner and reshapes lung sphingolipid/ceramide profiles [PMID:29536159], in part by lowering expression of the neighboring gene Ormdl3 [PMID:32273303], and the locus harbors cis-regulatory elements that influence circadian expression of the clock gene Nr1d1 [PMID:31560728]. ZPBP2 expression is itself controlled by sex- and age-dependent DNA methylation of its promoter, which modulates allele-specific expression [PMID:23546690, PMID:28241063].","teleology":[{"year":2003,"claim":"Establishing what ZPBP2 is at the sequence level was the first step: in silico characterization defined it as a secreted-type glycoprotein with a zona pellucida binding protein homologous domain co-expressed with ZPBP1 in testis, framing a candidate role in fertilization.","evidence":"in silico gene identification, domain and cDNA characterization, expression analysis","pmids":["12883658"],"confidence":"Low","gaps":["Computational prediction only; no direct functional experiment","Secretion and glycosylation not experimentally verified","ZPBH-domain biochemical activity undefined"]},{"year":2007,"claim":"Whether ZPBP2 has a non-redundant in vivo function was answered by a knockout showing it is required for acrosome biogenesis: null males are subfertile with acrosomal membrane invaginations, dysmorphic sperm, and impaired zona penetration.","evidence":"Zpbp2 knockout mouse with fertility assays, sperm morphology, and ultrastructural analysis","pmids":["17664285"],"confidence":"High","gaps":["Molecular mechanism linking ZPBP2 to acrosomal membrane shaping unresolved","Direct binding partners within the acrosome not identified in this study","Whether the defect is structural or signaling not distinguished"]},{"year":2011,"claim":"To define how ZPBP2 participates in sperm-zona recognition, proteomics placed it within high-molecular-weight sperm-surface complexes (including the CCT complex) that bind homologous zonae, with antibody inhibition implicating these complexes functionally.","evidence":"blue native PAGE, ESI-MS proteomics, western blot, antibody inhibition of sperm-zona binding","pmids":["21672535"],"confidence":"Medium","gaps":["Direct ZPBP2-CCT contact not demonstrated by reciprocal methods","Stoichiometry and architecture of the complex unknown","Functional inhibition attributed to complex, not ZPBP2 specifically"]},{"year":2013,"claim":"The discovery that ZPBP2 promoter methylation differs by sex and age opened a regulatory axis, linking the locus to control of neighboring 17q12-q21 gene expression.","evidence":"bisulfite sequencing of ZPBP2 promoter in blood stratified by sex and age, plus TDT genetic association","pmids":["23546690"],"confidence":"Medium","gaps":["Causal effect of methylation on ZPBP2 transcription not shown here","Mechanism connecting promoter methylation to neighboring gene expression undefined","Tissue specificity beyond blood not addressed"]},{"year":2017,"claim":"Two studies extended ZPBP2 biology: one proposed an HA-binding (hyaladherin) function via a Link-like domain, and another established that promoter demethylation directly upregulates ZPBP2 in an allele-dependent manner.","evidence":"HA affinity panning with LC-MS/MS and structural homology; 5-aza-dC treatment of human cell lines with bisulfite sequencing and allelic expression analysis","pmids":["29126140","28241063"],"confidence":"Medium","gaps":["HA-binding claim rests on single affinity method with expected hyaladherins absent (Low confidence)","Functional consequence of HA binding for fertilization not tested","Identity of the cis-elements driving allelic methylation response unknown"]},{"year":2018,"claim":"A somatic role emerged when Zpbp2 deletion was shown to attenuate airway hyperresponsiveness in females and to reshape lung sphingolipid/ceramide pools, with lung resistance correlating with S1P levels.","evidence":"Zpbp2 knockout mouse, methacholine AHR challenge, lung sphingolipid lipidomics, correlation analysis","pmids":["29536159"],"confidence":"Medium","gaps":["Whether the effect is from ZPBP2 protein or deletion of cis-regulatory DNA not separated","Basis of the sex-specific phenotype unexplained","Direct molecular link between ZPBP2 and sphingolipid enzymes missing"]},{"year":2019,"claim":"The locus was tied to circadian regulation: deletion of the Zpbp2 region altered tissue- and time-dependent expression of the clock gene Nr1d1 and enhanced Ormdl3 in liver, identifying cis-regulatory elements within the locus.","evidence":"Zpbp2 KO mouse, diurnal RT-qPCR profiling of Nr1d1 and Ormdl3 across tissues and time points","pmids":["31560728"],"confidence":"Medium","gaps":["Specific regulatory elements not mapped","Whether ZPBP2 transcript/protein mediates the effect vs deleted DNA unresolved","Mechanism of cross-regulation of Nr1d1 unknown"]},{"year":2020,"claim":"Dissecting which asthma phenotypes ZPBP2 controls showed that lower Ormdl3 in KO mice reduced AHR but did not prevent inflammation, mucus, or ceramide changes, separating ZPBP2-dependent from ZPBP2-independent effects.","evidence":"Zpbp2 KO mouse in HDM allergic asthma model, RT-qPCR for Ormdl3, AHR, histology, ceramide measurement","pmids":["32273303"],"confidence":"Medium","gaps":["Mechanism by which ZPBP2 locus modulates Ormdl3 not defined","Direct molecular intermediary between Ormdl3 and AHR unestablished","Generalizability beyond the HDM model untested"]},{"year":2022,"claim":"The acrosomal interaction network was clarified by identifying PRSS54 as a binding partner whose loss mislocalizes ZPBP2 (and ZPBP1, ACRBP, ZP3R) without altering its levels, placing ZPBP2 downstream of PRSS54-organized acrosomal architecture.","evidence":"Co-immunoprecipitation of PRSS54 with ZPBP2; Prss54 KO mouse with immunofluorescence localization in sperm/testis","pmids":["35863763"],"confidence":"Medium","gaps":["Direct vs indirect nature of the PRSS54-ZPBP2 interaction not resolved","Structural basis of acrosomal targeting unknown","Whether ZPBP2 mislocalization alone explains the fertility phenotype untested"]},{"year":null,"claim":"It remains unresolved whether the somatic respiratory, sphingolipid, and circadian phenotypes reflect a functional role of the ZPBP2 protein itself or the removal of cis-regulatory DNA within the locus, and the biochemical activity of the ZPBH domain in the acrosome is still undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No experiment separates ZPBP2 protein function from locus cis-regulatory effects","No defined molecular/enzymatic activity for the ZPBH domain","No structural model of ZPBP2 in any complex"]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,1,6]}],"complexes":["CCT (chaperonin-containing TCP-1) sperm-surface complex"],"partners":["ZPBP1","PRSS54","ACRBP","ZP3R"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6X784","full_name":"Zona pellucida-binding protein 2","aliases":["ZPBP-like protein"],"length_aa":338,"mass_kda":38.7,"function":"Is implicated in sperm-oocyte interaction during fertilization","subcellular_location":"Cytoplasmic vesicle, secretory vesicle, acrosome; Secreted","url":"https://www.uniprot.org/uniprotkb/Q6X784/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZPBP2","classification":"Not Classified","n_dependent_lines":36,"n_total_lines":1208,"dependency_fraction":0.029801324503311258},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ZPBP2","total_profiled":1310},"omim":[{"mim_id":"619799","title":"SPERMATOGENIC FAILURE 66; SPGF66","url":"https://www.omim.org/entry/619799"},{"mim_id":"614221","title":"BILIARY CIRRHOSIS, PRIMARY, 5; PBC5","url":"https://www.omim.org/entry/614221"},{"mim_id":"611403","title":"ASTHMA-RELATED TRAITS, SUSCEPTIBILITY TO, 6","url":"https://www.omim.org/entry/611403"},{"mim_id":"608499","title":"ZONA PELLUCIDA-BINDING PROTEIN 2; ZPBP2","url":"https://www.omim.org/entry/608499"},{"mim_id":"608498","title":"ZONA PELLUCIDA-BINDING PROTEIN; ZPBP","url":"https://www.omim.org/entry/608498"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in single","driving_tissues":[{"tissue":"testis","ntpm":89.1}],"url":"https://www.proteinatlas.org/search/ZPBP2"},"hgnc":{"alias_symbol":["ZPBPL","MGC41930"],"prev_symbol":[]},"alphafold":{"accession":"Q6X784","domains":[{"cath_id":"2.60.40.10","chopping":"22-139","consensus_level":"high","plddt":88.4908,"start":22,"end":139},{"cath_id":"3.30.70.60","chopping":"142-277","consensus_level":"high","plddt":92.6594,"start":142,"end":277},{"cath_id":"-","chopping":"279-327","consensus_level":"medium","plddt":93.6802,"start":279,"end":327}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6X784","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6X784-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6X784-F1-predicted_aligned_error_v6.png","plddt_mean":86.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZPBP2","jax_strain_url":"https://www.jax.org/strain/search?query=ZPBP2"},"sequence":{"accession":"Q6X784","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6X784.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6X784/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6X784"}},"corpus_meta":[{"pmid":"19732864","id":"PMC_19732864","title":"Allele-specific 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Imbalance.","date":"2020","source":"The Journal of pharmacology and experimental therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/32273303","citation_count":6,"is_preprint":false},{"pmid":"21594610","id":"PMC_21594610","title":"Hyperuricemia cosegregating with osteogenesis imperfecta is associated with a mutation in GPATCH8.","date":"2011","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21594610","citation_count":6,"is_preprint":false},{"pmid":"31560728","id":"PMC_31560728","title":"Regulatory interaction between the ZPBP2-ORMDL3/Zpbp2-Ormdl3 region and the circadian clock.","date":"2019","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/31560728","citation_count":5,"is_preprint":false},{"pmid":"27835674","id":"PMC_27835674","title":"Lymphocyte Activation Dynamics Is Shaped by Hereditary Components at Chromosome Region 17q12-q21.","date":"2016","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/27835674","citation_count":4,"is_preprint":false},{"pmid":"20846800","id":"PMC_20846800","title":"Molecular cloning of pig ZPBP2 and mRNA expression of ZPBP1 and ZPBP2 in reproductive tracts of boars.","date":"2010","source":"Animal reproduction science","url":"https://pubmed.ncbi.nlm.nih.gov/20846800","citation_count":1,"is_preprint":false},{"pmid":"41089893","id":"PMC_41089893","title":"Coordinated Transcriptomic and Epigenetic Approach Reveals Molecular Features Underlying Natural Mating Ability in Captive Male Giant Pandas.","date":"2025","source":"Ecology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/41089893","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":24342,"output_tokens":2869,"usd":0.05803,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10169,"output_tokens":3546,"usd":0.069748,"stage2_stop_reason":"end_turn"},"total_usd":0.127778,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"ZPBP2 (Zpbp2) plays a structural role during spermiogenesis; male mice null for Zpbp2 are subfertile, exhibit aberrant acrosomal membrane invaginations, and produce dysmorphic sperm with reduced ability to penetrate the zona pellucida, demonstrating that ZPBP2 is required for proper acrosome biogenesis.\",\n      \"method\": \"Zpbp2 knockout mouse model with fertility assays, sperm morphology analysis, and ultrastructural studies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular phenotype (subfertility, acrosome defects, zona penetration failure), ultrastructural validation, replicated in context of ZPBP1 KO comparison in same study\",\n      \"pmids\": [\"17664285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ZPBP2 is a component of high-molecular-weight protein complexes on the human sperm surface that display affinity for homologous zonae pellucidae; specifically, ZPBP2 was identified as a component of the chaperonin-containing TCP-1 (CCT) complex on sperm, and antibodies against complex subunits inhibited sperm binding to zona-intact oocytes.\",\n      \"method\": \"Blue native PAGE, electrospray ionization mass spectrometry proteomics, western blotting, antibody inhibition of sperm-zona binding\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (BN-PAGE, MS, functional antibody inhibition) in single lab; ZPBP2 identified as component of CCT complex with zona affinity\",\n      \"pmids\": [\"21672535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ZPBP2 contains a Link-like hyaluronic acid (HA)-binding domain and partitions exclusively into the HA-binding fraction from human sperm lysates, suggesting it may function as a hyaladherin in sperm-oocyte interaction.\",\n      \"method\": \"Protein affinity panning with HA substrate, LC-MS/MS proteomics, western blotting, structural homology analysis via PDBsum\",\n      \"journal\": \"Molecular human reproduction\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single affinity partitioning method with acknowledged limitations (expected hyaladherins CD44 and RHAMM not detected), structural inference only\",\n      \"pmids\": [\"29126140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Deletion of the mouse Zpbp2 gene attenuates airway hypersensitivity (AHR) in female but not male mice in the absence of allergic sensitization, and is associated with significantly lower levels of sphingosine-1-phosphate (S1P) and very long-chain ceramides (VLCCs), and higher levels of long-chain ceramides in female KO lungs; lung resistance correlated with lung S1P levels, suggesting Zpbp2 regulates AHR through ceramide/sphingolipid metabolism in a sex-dependent manner.\",\n      \"method\": \"Zpbp2 knockout mouse model, methacholine challenge (AHR measurement), lipidomics (sphingolipid profiling of lung, liver, spleen, plasma), Pearson correlation analysis\",\n      \"journal\": \"Mammalian genome\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined physiological phenotype plus lipidomic profiling providing mechanistic link to sphingolipid metabolism; single lab but multiple orthogonal readouts\",\n      \"pmids\": [\"29536159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Zpbp2 and Ormdl3 expression are regulated by the circadian clock in a tissue-specific fashion in mice; deletion of the Zpbp2 genomic region alters the expression profile of the core clock gene Nr1d1 in lungs and ileum in a time-dependent manner, and is associated with enhanced Ormdl3 expression in liver, indicating the Zpbp2 locus contains cis-regulatory elements that influence circadian clock gene expression.\",\n      \"method\": \"Zpbp2 KO mouse model, diurnal gene expression profiling (RT-qPCR) across tissues, comparison of Nr1d1 and Ormdl3 expression between KO and WT at multiple time points\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined transcriptional phenotype across multiple tissues and time points; single lab, mechanistic link between Zpbp2 region and circadian/clock gene regulation\",\n      \"pmids\": [\"31560728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Zpbp2 KO mice express lower levels of Ormdl3 mRNA than WT mice; in allergic asthma (HDM model), lower Ormdl3 expression in Zpbp2 KO mice was associated with lower AHR, but KO mice were not protected from inflammatory cell infiltration, mucus accumulation, or aberrant ceramide levels, indicating ZPBP2 influences Ormdl3 expression and AHR but not all allergic inflammatory phenotypes.\",\n      \"method\": \"Zpbp2 KO mouse model, HDM-induced allergic asthma model, RT-qPCR (Ormdl3 expression), AHR measurement, histological analysis, ceramide level measurement\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with multiple defined phenotypic readouts separating Zpbp2-dependent from Zpbp2-independent effects; single lab\",\n      \"pmids\": [\"32273303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PRSS54 interacts with acrosomal proteins ZPBP1, ZPBP2, ACRBP, and ZP3R in testis and sperm; loss of PRSS54 disrupts the distribution of ZPBP2 (and other acrosomal proteins) in testis and sperm without affecting their protein levels, placing ZPBP2 as a downstream target of PRSS54-mediated acrosomal organization.\",\n      \"method\": \"Co-immunoprecipitation (interaction of PRSS54 with ZPBP2), Prss54 KO mouse model, immunofluorescence localization of ZPBP2 in KO vs WT\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing physical interaction plus KO showing functional consequence on ZPBP2 localization; single lab\",\n      \"pmids\": [\"35863763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DNA methylation at a regulatory region within the ZPBP2 gene promoter shows statistically significant sex-specific and age-dependent differences, with higher methylation in adult males vs boys and sex-specific differences between males and females; this region was also identified as containing functionally important polymorphisms influencing expression of neighboring 17q12-q21 genes.\",\n      \"method\": \"Bisulfite sequencing methylation assay of ZPBP2 promoter region in blood samples stratified by sex and age, TDT genetic association test\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct bisulfite sequencing of ZPBP2 promoter with sex and age stratification; replicated in context of prior functional polymorphism mapping in same region\",\n      \"pmids\": [\"23546690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Treatment of airway epithelial cells (NuLi-1) with the DNA methyltransferase inhibitor 5-aza-dC causes upregulation of ZPBP2 expression accompanied by a decrease in promoter methylation (8-13% change sufficient to cause substantial RNA level changes); allelic expression of ZPBP2 is modulated by DNA methylation, with different alleles responding differently to demethylation treatment.\",\n      \"method\": \"5-aza-2'-deoxycytidine treatment of human cell lines (NuLi-1, 293T, MCF-7), RT-qPCR expression analysis, bisulfite sequencing of ZPBP2 promoter methylation, allelic expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological demethylation with matched promoter methylation and expression readouts in multiple cell lines; single lab\",\n      \"pmids\": [\"28241063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ZPBP2 (originally named ZPBPL/ZPBP-like) encodes a secreted-type glycoprotein with a zona pellucida binding protein homologous (ZPBH) domain containing 15 conserved cysteine residues; the gene consists of seven exons and the protein shares 34.8% amino acid identity with ZPBP1 (a type 2 transmembrane protein), with both co-expressed in testis.\",\n      \"method\": \"In silico gene identification, bioinformatics domain analysis, cDNA characterization, expression analysis\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational/bioinformatic prediction and expression analysis only; no direct functional experiment\",\n      \"pmids\": [\"12883658\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZPBP2 is a secreted glycoprotein with a zona pellucida binding protein homologous (ZPBH) domain that is highly expressed in testes during spermiogenesis; it plays a structural role in acrosome biogenesis and sperm morphogenesis (loss causes subfertility, acrosomal membrane invaginations, and impaired zona penetration), participates in high-molecular-weight sperm surface complexes that bind the zona pellucida, interacts with acrosomal proteins including ZPBP1, ACRBP, and ZP3R (with its localization dependent on PRSS54), and in somatic tissues (particularly lung) influences airway hyperresponsiveness and sphingolipid/ceramide metabolism in a sex-dependent fashion, partly through regulation of Ormdl3 expression; its promoter region is subject to sex- and age-dependent DNA methylation that modulates allele-specific expression, and the Zpbp2 genomic region contains cis-regulatory elements that influence expression of the circadian clock gene Nr1d1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZPBP2 is a testis-expressed protein required for acrosome biogenesis and sperm morphogenesis during spermiogenesis: mice lacking Zpbp2 are subfertile, develop aberrant acrosomal membrane invaginations, and produce dysmorphic sperm with impaired ability to penetrate the zona pellucida [#0]. Its proper acrosomal distribution depends on PRSS54, which physically interacts with ZPBP2 alongside the acrosomal proteins ZPBP1, ACRBP, and ZP3R; loss of PRSS54 mislocalizes ZPBP2 without changing its abundance, placing ZPBP2 downstream of PRSS54-organized acrosomal architecture [#6]. On the human sperm surface ZPBP2 is found within high-molecular-weight complexes with affinity for homologous zonae pellucidae, including association with the chaperonin-containing TCP-1 (CCT) complex, and antibodies against complex subunits block sperm-zona binding [#1]. Beyond the male germline, the Zpbp2 locus has a distinct somatic role: deletion of the gene region attenuates airway hyperresponsiveness in a sex-dependent manner and reshapes lung sphingolipid/ceramide profiles [#3], in part by lowering expression of the neighboring gene Ormdl3 [#5], and the locus harbors cis-regulatory elements that influence circadian expression of the clock gene Nr1d1 [#4]. ZPBP2 expression is itself controlled by sex- and age-dependent DNA methylation of its promoter, which modulates allele-specific expression [#7, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing what ZPBP2 is at the sequence level was the first step: in silico characterization defined it as a secreted-type glycoprotein with a zona pellucida binding protein homologous domain co-expressed with ZPBP1 in testis, framing a candidate role in fertilization.\",\n      \"evidence\": \"in silico gene identification, domain and cDNA characterization, expression analysis\",\n      \"pmids\": [\"12883658\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Computational prediction only; no direct functional experiment\",\n        \"Secretion and glycosylation not experimentally verified\",\n        \"ZPBH-domain biochemical activity undefined\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Whether ZPBP2 has a non-redundant in vivo function was answered by a knockout showing it is required for acrosome biogenesis: null males are subfertile with acrosomal membrane invaginations, dysmorphic sperm, and impaired zona penetration.\",\n      \"evidence\": \"Zpbp2 knockout mouse with fertility assays, sperm morphology, and ultrastructural analysis\",\n      \"pmids\": [\"17664285\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism linking ZPBP2 to acrosomal membrane shaping unresolved\",\n        \"Direct binding partners within the acrosome not identified in this study\",\n        \"Whether the defect is structural or signaling not distinguished\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"To define how ZPBP2 participates in sperm-zona recognition, proteomics placed it within high-molecular-weight sperm-surface complexes (including the CCT complex) that bind homologous zonae, with antibody inhibition implicating these complexes functionally.\",\n      \"evidence\": \"blue native PAGE, ESI-MS proteomics, western blot, antibody inhibition of sperm-zona binding\",\n      \"pmids\": [\"21672535\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct ZPBP2-CCT contact not demonstrated by reciprocal methods\",\n        \"Stoichiometry and architecture of the complex unknown\",\n        \"Functional inhibition attributed to complex, not ZPBP2 specifically\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The discovery that ZPBP2 promoter methylation differs by sex and age opened a regulatory axis, linking the locus to control of neighboring 17q12-q21 gene expression.\",\n      \"evidence\": \"bisulfite sequencing of ZPBP2 promoter in blood stratified by sex and age, plus TDT genetic association\",\n      \"pmids\": [\"23546690\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Causal effect of methylation on ZPBP2 transcription not shown here\",\n        \"Mechanism connecting promoter methylation to neighboring gene expression undefined\",\n        \"Tissue specificity beyond blood not addressed\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Two studies extended ZPBP2 biology: one proposed an HA-binding (hyaladherin) function via a Link-like domain, and another established that promoter demethylation directly upregulates ZPBP2 in an allele-dependent manner.\",\n      \"evidence\": \"HA affinity panning with LC-MS/MS and structural homology; 5-aza-dC treatment of human cell lines with bisulfite sequencing and allelic expression analysis\",\n      \"pmids\": [\"29126140\", \"28241063\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"HA-binding claim rests on single affinity method with expected hyaladherins absent (Low confidence)\",\n        \"Functional consequence of HA binding for fertilization not tested\",\n        \"Identity of the cis-elements driving allelic methylation response unknown\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A somatic role emerged when Zpbp2 deletion was shown to attenuate airway hyperresponsiveness in females and to reshape lung sphingolipid/ceramide pools, with lung resistance correlating with S1P levels.\",\n      \"evidence\": \"Zpbp2 knockout mouse, methacholine AHR challenge, lung sphingolipid lipidomics, correlation analysis\",\n      \"pmids\": [\"29536159\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether the effect is from ZPBP2 protein or deletion of cis-regulatory DNA not separated\",\n        \"Basis of the sex-specific phenotype unexplained\",\n        \"Direct molecular link between ZPBP2 and sphingolipid enzymes missing\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The locus was tied to circadian regulation: deletion of the Zpbp2 region altered tissue- and time-dependent expression of the clock gene Nr1d1 and enhanced Ormdl3 in liver, identifying cis-regulatory elements within the locus.\",\n      \"evidence\": \"Zpbp2 KO mouse, diurnal RT-qPCR profiling of Nr1d1 and Ormdl3 across tissues and time points\",\n      \"pmids\": [\"31560728\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific regulatory elements not mapped\",\n        \"Whether ZPBP2 transcript/protein mediates the effect vs deleted DNA unresolved\",\n        \"Mechanism of cross-regulation of Nr1d1 unknown\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Dissecting which asthma phenotypes ZPBP2 controls showed that lower Ormdl3 in KO mice reduced AHR but did not prevent inflammation, mucus, or ceramide changes, separating ZPBP2-dependent from ZPBP2-independent effects.\",\n      \"evidence\": \"Zpbp2 KO mouse in HDM allergic asthma model, RT-qPCR for Ormdl3, AHR, histology, ceramide measurement\",\n      \"pmids\": [\"32273303\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which ZPBP2 locus modulates Ormdl3 not defined\",\n        \"Direct molecular intermediary between Ormdl3 and AHR unestablished\",\n        \"Generalizability beyond the HDM model untested\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The acrosomal interaction network was clarified by identifying PRSS54 as a binding partner whose loss mislocalizes ZPBP2 (and ZPBP1, ACRBP, ZP3R) without altering its levels, placing ZPBP2 downstream of PRSS54-organized acrosomal architecture.\",\n      \"evidence\": \"Co-immunoprecipitation of PRSS54 with ZPBP2; Prss54 KO mouse with immunofluorescence localization in sperm/testis\",\n      \"pmids\": [\"35863763\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct vs indirect nature of the PRSS54-ZPBP2 interaction not resolved\",\n        \"Structural basis of acrosomal targeting unknown\",\n        \"Whether ZPBP2 mislocalization alone explains the fertility phenotype untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved whether the somatic respiratory, sphingolipid, and circadian phenotypes reflect a functional role of the ZPBP2 protein itself or the removal of cis-regulatory DNA within the locus, and the biochemical activity of the ZPBH domain in the acrosome is still undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No experiment separates ZPBP2 protein function from locus cis-regulatory effects\",\n        \"No defined molecular/enzymatic activity for the ZPBH domain\",\n        \"No structural model of ZPBP2 in any complex\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 1, 6]}\n    ],\n    \"complexes\": [\"CCT (chaperonin-containing TCP-1) sperm-surface complex\"],\n    \"partners\": [\"ZPBP1\", \"PRSS54\", \"ACRBP\", \"ZP3R\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}