{"gene":"TEX12","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2006,"finding":"TEX12 is a component of the central element of the synaptonemal complex (SC) in mouse meiocytes. TEX12 specifically co-precipitates with SYCE2, indicating they form a complex. TEX12 and SYCE2 depend on the transverse filament protein SYCP1 for localization to meiotic chromosomes (shown using SYCP1 knockout models). TEX12/SYCE2 complex interacts with SYCE1, which in turn interacts more directly with SYCP1, suggesting a molecular network within the central element.","method":"Co-immunoprecipitation, immunofluorescence co-localization, knockout mouse models (Sycp1-/-, Syce1-/-, Syce2-/- ), immunoelectron microscopy","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with knockout validation across multiple mouse models, replicated in multiple subsequent studies","pmids":["16968740"],"is_preprint":false},{"year":2008,"finding":"TEX12 is essential for propagation of chromosomal synapsis along paired homologous chromosomes and for maturation of early meiotic recombination events into crossovers. In Tex12-/- meiocytes, synapsis initiates at multiple positions but fails to propagate, and early recombination events fail to develop into crossovers. The central element structure is disrupted in the absence of TEX12.","method":"Tex12 knockout mouse, structural analysis of SC by immunofluorescence and electron microscopy, recombination marker analysis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined structural and functional phenotypic readouts, multiple orthogonal analyses","pmids":["18611960"],"is_preprint":false},{"year":2012,"finding":"PLK1 directly phosphorylates TEX12 (and SYCP1) in vitro. PLK1 localizes to the SC during the G2/MI transition, and PLK1 inhibition (BI 2536) prevents phosphorylation of TEX12 and its removal from the SC during meiotic prophase exit, demonstrating that PLK1-mediated phosphorylation of TEX12 is required for SC central element disassembly at the prophase-to-metaphase I transition.","method":"In vitro phosphorylation assay with PLK1–4, PLK1 inhibitor (BI 2536) treatment of pachytene spermatocytes ex vivo with okadaic acid, immunofluorescence, immunoprecipitation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro kinase assay plus cellular inhibitor experiments with defined phenotype, single lab but two orthogonal methods","pmids":["22854038"],"is_preprint":false},{"year":2012,"finding":"Human SYCE2 and TEX12 form a highly stable, constitutive equimolar hetero-octameric complex (SYCE2 tetramer + two TEX12 dimers). Biochemically reconstituted SYCE2-TEX12 complexes spontaneously assemble into filamentous structures resembling the SC central element, as visualized by electron microscopy. Regions responsible for homotypic (SYCE2:SYCE2, TEX12:TEX12) and heterotypic (SYCE2:TEX12) interactions were defined.","method":"Biochemical reconstitution, biophysical analysis (analytical ultracentrifugation, gel filtration), electron microscopy, domain-mapping experiments","journal":"Open biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution of complex, EM visualization of fibers, biophysical stoichiometry determination, multiple orthogonal methods in one study","pmids":["22870393"],"is_preprint":false},{"year":2016,"finding":"Disruption of SYCE2 and TEX12 localization to the SC central element abolishes central alignment of the N-terminal region of SYCP1, showing that TEX12 (along with SYCE1, SYCE2, SYCE3) contributes in an interdependent manner to stabilization of opposing SYCP1 N-terminal regions to form a bilayered transverse-filament-central-element junction structure.","method":"Immunoelectron microscopy with gold particles, analysis of SYCE2/TEX12-deficient meiocytes, protein interaction data","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunoEM with defined localization consequence in loss-of-function context, single lab with two orthogonal methods","pmids":["27103161"],"is_preprint":false},{"year":2021,"finding":"X-ray crystal structures of human SYCE2-TEX12 reveal it forms 2:2 coiled-coil building blocks that dimerize into 4:4 hetero-oligomers, which interact end-to-end and laterally to form 10-nm fibers that intertwine into 40-nm bundled micrometer-long fibers defining the SC midline. This hierarchical fibrous assembly mechanism (resembling intermediate filament proteins vimentin, lamin, keratin) was confirmed by mutagenesis, biophysics, and electron microscopy.","method":"X-ray crystallography, mutagenesis, biophysical analysis (SAXS, AUC, SEC-MALS), electron microscopy","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures plus mutagenesis plus multiple biophysical methods plus EM, all in one rigorous study; mechanism of fiber assembly fully reconstituted","pmids":["34373646"],"is_preprint":false},{"year":2021,"finding":"TEX12 localizes to centrosomes during meiosis independently of chromosome synapsis. In somatic cells, ectopically expressed TEX12 similarly localizes to centrosomes and is associated with centrosome amplification. Phosphorylation of TEX12 on tyrosine 48 is important for centrosome amplification but not for recruitment of TEX12 to centrosomes. TEX12 expression is aberrantly activated via retinoic acid signaling in cancer cells, and proliferation of some cancer cells is TEX12-dependent.","method":"Immunofluorescence (meiotic and somatic cells), ectopic expression in somatic cells, structure-function/mutagenesis (Y48 phospho-mutant), siRNA knockdown, retinoic acid treatment assays","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional consequence, mutagenesis identifying phosphorylation site, single lab with multiple orthogonal methods","pmids":["34880391"],"is_preprint":false},{"year":2021,"finding":"TEX11 (mammalian ortholog of yeast Zip4) interacts with the SC central element protein TEX12, suggesting a conserved mechanism by which ZMM proteins directly couple crossover formation to SC central element assembly.","method":"Protein interaction assay (specific method not detailed in abstract), comparative analysis with yeast Zip4-Ecm11 interaction","journal":"Genes & development","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single mention in abstract without detailed methodological description of the mammalian TEX11-TEX12 interaction experiment","pmids":["34969823"],"is_preprint":false},{"year":2022,"finding":"X-ray crystal structures of TEX12 mutants reveal three distinct conformations; solution scattering (SAXS/light scattering) determines that wild-type TEX12 adopts a dimeric four-helical coiled-coil structure. Mutations in TEX12's C-terminal tip (the region that drives SYCE2-TEX12 fibrous assembly in the SC) cause conformational change and alter the oligomeric state of isolated TEX12, demonstrating that the C-terminal tip controls both SYCE2-TEX12 SC assembly and the conformation/oligomerization of TEX12 itself.","method":"X-ray crystallography of TEX12 mutants (three conformations), solution SAXS, dynamic light scattering, mutagenesis","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures plus SAXS plus mutagenesis in one study, multiple orthogonal methods establishing structure-function relationship","pmids":["36071143"],"is_preprint":false},{"year":2023,"finding":"SYCE3 interacts with the SC central element complexes SYCE1-SIX6OS1 and SYCE2-TEX12, providing a mechanism for their recruitment during SC assembly. SYCE3 also remodels SYCP1 tetramers into 2:1 heterotrimers by binding, disrupting the SYCP1 lattice and establishing a new SYCP1-SYCE3 lattice that recruits CE complexes including SYCE2-TEX12.","method":"Biochemical approaches, separation-of-function mutagenesis in mice, pulldown/interaction assays, structural analysis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical reconstitution plus separation-of-function mutagenesis in mice, multiple orthogonal methods establishing SYCE3-SYCE2-TEX12 interaction and its role in SC assembly","pmids":["36635604"],"is_preprint":false},{"year":2025,"finding":"The yeast SC central element complex Ecm11-Gmc2 forms a 2:2 hetero-oligomer with architecture and dimensions similar to the mammalian SYCE2-TEX12 complex, and this 2:2 complex formation is essential for SC assembly in vivo, further validating the conserved structural role of the SYCE2-TEX12 type heterocomplex across species.","method":"Biochemical reconstitution of Ecm11-Gmc2, biophysical analysis (stoichiometry), targeted mutagenesis in yeast","journal":"Open biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous reconstitution and mutagenesis but concerns the yeast ortholog; provides structural parallel to SYCE2-TEX12 but does not directly interrogate TEX12 itself","pmids":["41537827"],"is_preprint":false}],"current_model":"TEX12 is an essential meiosis-specific component of the synaptonemal complex (SC) central element that forms a highly stable hetero-oligomeric complex with SYCE2 (2:2 coiled-coil building blocks assembling hierarchically into micrometer-long intermediate-filament-like fibers), which is recruited to the SC via SYCE3-mediated interactions and depends on SYCP1 for chromosomal localization; TEX12 is required for propagation of chromosomal synapsis and maturation of recombination intermediates into crossovers, its C-terminal tip drives both SYCE2-TEX12 fiber assembly and controls TEX12's own oligomeric conformation, PLK1 directly phosphorylates TEX12 to trigger SC disassembly at meiotic prophase exit, and TEX12 also localizes to meiotic centrosomes where phosphorylation at tyrosine 48 mediates centrosome amplification when aberrantly expressed in somatic/cancer cells."},"narrative":{"mechanistic_narrative":"TEX12 is an essential meiosis-specific structural component of the synaptonemal complex (SC) central element that mediates propagation of chromosomal synapsis and the maturation of recombination intermediates into crossovers [PMID:16968740, PMID:18611960]. It functions as an obligate partner of SYCE2, with which it forms a highly stable, constitutive hetero-oligomeric complex (SYCE2 tetramer plus two TEX12 dimers) that spontaneously self-assembles into central-element-like filaments [PMID:22870393]; crystallographic and biophysical analysis resolves this as 2:2 coiled-coil building blocks that dimerize and associate end-to-end and laterally into micrometer-long, intermediate-filament-like bundled fibers defining the SC midline [PMID:34373646]. The C-terminal tip of TEX12 governs both its own dimeric coiled-coil conformation/oligomeric state and the SYCE2-TEX12 fibrous assembly reaction [PMID:36071143]. Chromosomal recruitment of the SYCE2-TEX12 complex depends on SYCP1 and is mediated through SYCE3, which remodels the SYCP1 lattice to dock the central element complexes, while TEX12 in turn stabilizes the opposing SYCP1 N-termini at the transverse-filament/central-element junction [PMID:16968740, PMID:27103161, PMID:36635604]. SC disassembly at the prophase-to-metaphase I transition is triggered by direct PLK1 phosphorylation of TEX12, which drives its removal from the SC [PMID:22854038]. Beyond meiotic chromosomes, TEX12 localizes to centrosomes, where phosphorylation on tyrosine 48 mediates centrosome amplification when TEX12 is aberrantly expressed in somatic and cancer cells [PMID:34880391].","teleology":[{"year":2006,"claim":"Established TEX12 as a central element protein and defined its position in the SC interaction network, answering where in the SC TEX12 acts and which partners it depends on.","evidence":"Co-IP, immunofluorescence and immunoEM in mouse meiocytes with Sycp1/Syce1/Syce2 knockouts","pmids":["16968740"],"confidence":"High","gaps":["Did not define stoichiometry or the structural basis of the SYCE2-TEX12 interaction","Direct vs. indirect nature of the SYCE1 link not resolved"]},{"year":2008,"claim":"Demonstrated that TEX12 is functionally required not just for SC structure but for synapsis propagation and crossover maturation, linking the central element to recombination outcomes.","evidence":"Tex12 knockout mouse with SC structural analysis and recombination marker readouts","pmids":["18611960"],"confidence":"High","gaps":["Molecular mechanism coupling central element assembly to crossover maturation not defined","Whether the recombination defect is direct or secondary to synapsis failure unresolved"]},{"year":2012,"claim":"Resolved the stoichiometry and self-assembly capacity of the SYCE2-TEX12 complex, showing it is the minimal fiber-forming unit of the central element.","evidence":"Biochemical reconstitution, AUC/gel filtration and EM of human SYCE2-TEX12","pmids":["22870393"],"confidence":"High","gaps":["Atomic-resolution architecture of the building block not yet determined","How reconstituted fibers relate to in vivo midline geometry unclear"]},{"year":2012,"claim":"Identified the regulated disassembly mechanism, showing PLK1 phosphorylation of TEX12 drives central element removal at prophase exit.","evidence":"In vitro PLK1 kinase assay plus PLK1 inhibition (BI 2536) in ex vivo spermatocytes","pmids":["22854038"],"confidence":"High","gaps":["Specific phosphosites on TEX12 not mapped","Whether phosphorylation directly destabilizes the SYCE2-TEX12 fiber unknown"]},{"year":2016,"claim":"Placed TEX12 in the interdependent stabilization of opposing SYCP1 N-termini, defining how central element proteins build the transverse-filament junction.","evidence":"ImmunoEM in SYCE2/TEX12-deficient meiocytes","pmids":["27103161"],"confidence":"Medium","gaps":["Single lab, immunoEM-based; direct TEX12-SYCP1 contact not biochemically demonstrated"]},{"year":2021,"claim":"Provided the atomic and hierarchical assembly mechanism, defining SYCE2-TEX12 as an intermediate-filament-like fiber that builds the SC midline.","evidence":"X-ray crystallography, SAXS/AUC/SEC-MALS, mutagenesis and EM","pmids":["34373646"],"confidence":"High","gaps":["In vivo fiber dimensions and dynamics not directly imaged","Contribution of other CE proteins to native fiber assembly not captured in reconstitution"]},{"year":2021,"claim":"Revealed a meiosis-independent centrosomal role for TEX12 and a pathological function when ectopically expressed, implicating Y48 phosphorylation in centrosome amplification.","evidence":"Immunofluorescence, ectopic expression, Y48 phospho-mutant, siRNA and retinoic acid assays in somatic/cancer cells","pmids":["34880391"],"confidence":"Medium","gaps":["Kinase responsible for Y48 phosphorylation unidentified","Mechanism of centrosome amplification not defined","Single lab, requires independent confirmation"]},{"year":2021,"claim":"Proposed a direct ZMM-to-central-element link via TEX11-TEX12 interaction, coupling crossover machinery to SC assembly.","evidence":"Protein interaction assay (method not detailed) with comparison to yeast Zip4-Ecm11","pmids":["34969823"],"confidence":"Low","gaps":["Mammalian TEX11-TEX12 interaction method undescribed and not independently validated","Functional consequence of the interaction not tested"]},{"year":2022,"claim":"Mapped the TEX12 C-terminal tip as the dual control element governing both TEX12's own oligomeric conformation and SYCE2-TEX12 fiber assembly.","evidence":"X-ray crystallography of TEX12 mutants, SAXS, dynamic light scattering and mutagenesis","pmids":["36071143"],"confidence":"High","gaps":["In vivo consequence of tip mutations on synapsis not tested","How conformational switching is regulated in cells unknown"]},{"year":2023,"claim":"Defined SYCE3 as the recruiter of SYCE2-TEX12, showing it remodels the SYCP1 lattice to dock central element complexes.","evidence":"Biochemistry, separation-of-function mutagenesis in mice, pulldowns and structural analysis","pmids":["36635604"],"confidence":"High","gaps":["Temporal ordering of SYCE3 remodeling relative to TEX12 fiber growth not resolved","Direct SYCE3-TEX12 contact surface not defined"]},{"year":2025,"claim":"Validated cross-species conservation of the 2:2 heterocomplex architecture via the yeast Ecm11-Gmc2 ortholog, reinforcing the structural principle underlying SYCE2-TEX12.","evidence":"Reconstitution and biophysics of yeast Ecm11-Gmc2 with in vivo mutagenesis","pmids":["41537827"],"confidence":"Medium","gaps":["Concerns yeast orthologs and does not directly interrogate mammalian TEX12","Sequence-level conservation of TEX12 interfaces not addressed"]},{"year":null,"claim":"How TEX12's centrosomal/oncogenic function mechanistically relates to its SC structural role, and how phosphoregulation (PLK1, Y48) integrates assembly and disassembly, remain open.","evidence":"No single study in the timeline reconciles the meiotic and centrosomal functions","pmids":[],"confidence":"Low","gaps":["Kinase for Y48 and full PLK1 phosphosite map unknown","Direct mechanism of centrosome amplification undefined","No structural model of TEX12 at the centrosome"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,5,8]}],"localization":[{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[6]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2]}],"complexes":["SYCE2-TEX12 central element complex","synaptonemal complex central element"],"partners":["SYCE2","SYCE3","SYCP1","SYCE1","PLK1","TEX11"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BXU0","full_name":"Testis-expressed protein 12","aliases":[],"length_aa":123,"mass_kda":14.1,"function":"Component of the transverse central element of synaptonemal complexes (SCS), formed between homologous chromosomes during meiotic prophase (By similarity). Requires SYCP1 in order to be incorporated into the central element (By similarity)","subcellular_location":"Chromosome","url":"https://www.uniprot.org/uniprotkb/Q9BXU0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TEX12","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TEX12","total_profiled":1310},"omim":[{"mim_id":"618968","title":"CHROMOSOME 1 OPEN READING FRAME 146; C1ORF146","url":"https://www.omim.org/entry/618968"},{"mim_id":"605791","title":"TESTIS-EXPRESSED GENE 12; TEX12","url":"https://www.omim.org/entry/605791"},{"mim_id":"300311","title":"TESTIS-EXPRESSED GENE 11; TEX11","url":"https://www.omim.org/entry/300311"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Centrosome","reliability":"Supported"},{"location":"Basal body","reliability":"Supported"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"retina","ntpm":8.0},{"tissue":"testis","ntpm":19.3}],"url":"https://www.proteinatlas.org/search/TEX12"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9BXU0","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BXU0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BXU0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BXU0-F1-predicted_aligned_error_v6.png","plddt_mean":79.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TEX12","jax_strain_url":"https://www.jax.org/strain/search?query=TEX12"},"sequence":{"accession":"Q9BXU0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BXU0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BXU0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BXU0"}},"corpus_meta":[{"pmid":"16968740","id":"PMC_16968740","title":"Characterization of a novel meiosis-specific protein within the central element of the synaptonemal complex.","date":"2006","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/16968740","citation_count":129,"is_preprint":false},{"pmid":"18611960","id":"PMC_18611960","title":"Progression of meiotic recombination requires structural maturation of the central element of the synaptonemal complex.","date":"2008","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/18611960","citation_count":101,"is_preprint":false},{"pmid":"22854038","id":"PMC_22854038","title":"Polo-like kinase is required for synaptonemal complex disassembly and phosphorylation in mouse spermatocytes.","date":"2012","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/22854038","citation_count":82,"is_preprint":false},{"pmid":"18802461","id":"PMC_18802461","title":"Corona is required for higher-order assembly of transverse filaments into full-length synaptonemal complex in Drosophila oocytes.","date":"2008","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/18802461","citation_count":64,"is_preprint":false},{"pmid":"22870393","id":"PMC_22870393","title":"Structural analysis of the human SYCE2-TEX12 complex provides molecular insights into synaptonemal complex assembly.","date":"2012","source":"Open biology","url":"https://pubmed.ncbi.nlm.nih.gov/22870393","citation_count":50,"is_preprint":false},{"pmid":"34969823","id":"PMC_34969823","title":"The Zip4 protein directly couples meiotic crossover formation to synaptonemal complex assembly.","date":"2021","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/34969823","citation_count":38,"is_preprint":false},{"pmid":"30607510","id":"PMC_30607510","title":"Molecular structure of human synaptonemal complex protein SYCE1.","date":"2019","source":"Chromosoma","url":"https://pubmed.ncbi.nlm.nih.gov/30607510","citation_count":37,"is_preprint":false},{"pmid":"27103161","id":"PMC_27103161","title":"The central element of the synaptonemal complex in mice is organized as a bilayered junction structure.","date":"2016","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/27103161","citation_count":35,"is_preprint":false},{"pmid":"34373646","id":"PMC_34373646","title":"Structural basis of meiotic chromosome synaptic elongation through hierarchical fibrous assembly of SYCE2-TEX12.","date":"2021","source":"Nature structural & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/34373646","citation_count":33,"is_preprint":false},{"pmid":"29934299","id":"PMC_29934299","title":"Two Tabersonine 6,7-Epoxidases Initiate Lochnericine-Derived Alkaloid Biosynthesis in Catharanthus roseus.","date":"2018","source":"Plant physiology","url":"https://pubmed.ncbi.nlm.nih.gov/29934299","citation_count":32,"is_preprint":false},{"pmid":"31023827","id":"PMC_31023827","title":"A molecular model for self-assembly of the synaptonemal complex protein SYCE3.","date":"2019","source":"The Journal of biological 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/41537827","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12458,"output_tokens":3171,"usd":0.04247,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10600,"output_tokens":3484,"usd":0.07005,"stage2_stop_reason":"end_turn"},"total_usd":0.11252,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"TEX12 is a component of the central element of the synaptonemal complex (SC) in mouse meiocytes. TEX12 specifically co-precipitates with SYCE2, indicating they form a complex. TEX12 and SYCE2 depend on the transverse filament protein SYCP1 for localization to meiotic chromosomes (shown using SYCP1 knockout models). TEX12/SYCE2 complex interacts with SYCE1, which in turn interacts more directly with SYCP1, suggesting a molecular network within the central element.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, knockout mouse models (Sycp1-/-, Syce1-/-, Syce2-/- ), immunoelectron microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with knockout validation across multiple mouse models, replicated in multiple subsequent studies\",\n      \"pmids\": [\"16968740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TEX12 is essential for propagation of chromosomal synapsis along paired homologous chromosomes and for maturation of early meiotic recombination events into crossovers. In Tex12-/- meiocytes, synapsis initiates at multiple positions but fails to propagate, and early recombination events fail to develop into crossovers. The central element structure is disrupted in the absence of TEX12.\",\n      \"method\": \"Tex12 knockout mouse, structural analysis of SC by immunofluorescence and electron microscopy, recombination marker analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined structural and functional phenotypic readouts, multiple orthogonal analyses\",\n      \"pmids\": [\"18611960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PLK1 directly phosphorylates TEX12 (and SYCP1) in vitro. PLK1 localizes to the SC during the G2/MI transition, and PLK1 inhibition (BI 2536) prevents phosphorylation of TEX12 and its removal from the SC during meiotic prophase exit, demonstrating that PLK1-mediated phosphorylation of TEX12 is required for SC central element disassembly at the prophase-to-metaphase I transition.\",\n      \"method\": \"In vitro phosphorylation assay with PLK1–4, PLK1 inhibitor (BI 2536) treatment of pachytene spermatocytes ex vivo with okadaic acid, immunofluorescence, immunoprecipitation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro kinase assay plus cellular inhibitor experiments with defined phenotype, single lab but two orthogonal methods\",\n      \"pmids\": [\"22854038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human SYCE2 and TEX12 form a highly stable, constitutive equimolar hetero-octameric complex (SYCE2 tetramer + two TEX12 dimers). Biochemically reconstituted SYCE2-TEX12 complexes spontaneously assemble into filamentous structures resembling the SC central element, as visualized by electron microscopy. Regions responsible for homotypic (SYCE2:SYCE2, TEX12:TEX12) and heterotypic (SYCE2:TEX12) interactions were defined.\",\n      \"method\": \"Biochemical reconstitution, biophysical analysis (analytical ultracentrifugation, gel filtration), electron microscopy, domain-mapping experiments\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution of complex, EM visualization of fibers, biophysical stoichiometry determination, multiple orthogonal methods in one study\",\n      \"pmids\": [\"22870393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Disruption of SYCE2 and TEX12 localization to the SC central element abolishes central alignment of the N-terminal region of SYCP1, showing that TEX12 (along with SYCE1, SYCE2, SYCE3) contributes in an interdependent manner to stabilization of opposing SYCP1 N-terminal regions to form a bilayered transverse-filament-central-element junction structure.\",\n      \"method\": \"Immunoelectron microscopy with gold particles, analysis of SYCE2/TEX12-deficient meiocytes, protein interaction data\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunoEM with defined localization consequence in loss-of-function context, single lab with two orthogonal methods\",\n      \"pmids\": [\"27103161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"X-ray crystal structures of human SYCE2-TEX12 reveal it forms 2:2 coiled-coil building blocks that dimerize into 4:4 hetero-oligomers, which interact end-to-end and laterally to form 10-nm fibers that intertwine into 40-nm bundled micrometer-long fibers defining the SC midline. This hierarchical fibrous assembly mechanism (resembling intermediate filament proteins vimentin, lamin, keratin) was confirmed by mutagenesis, biophysics, and electron microscopy.\",\n      \"method\": \"X-ray crystallography, mutagenesis, biophysical analysis (SAXS, AUC, SEC-MALS), electron microscopy\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures plus mutagenesis plus multiple biophysical methods plus EM, all in one rigorous study; mechanism of fiber assembly fully reconstituted\",\n      \"pmids\": [\"34373646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TEX12 localizes to centrosomes during meiosis independently of chromosome synapsis. In somatic cells, ectopically expressed TEX12 similarly localizes to centrosomes and is associated with centrosome amplification. Phosphorylation of TEX12 on tyrosine 48 is important for centrosome amplification but not for recruitment of TEX12 to centrosomes. TEX12 expression is aberrantly activated via retinoic acid signaling in cancer cells, and proliferation of some cancer cells is TEX12-dependent.\",\n      \"method\": \"Immunofluorescence (meiotic and somatic cells), ectopic expression in somatic cells, structure-function/mutagenesis (Y48 phospho-mutant), siRNA knockdown, retinoic acid treatment assays\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional consequence, mutagenesis identifying phosphorylation site, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"34880391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TEX11 (mammalian ortholog of yeast Zip4) interacts with the SC central element protein TEX12, suggesting a conserved mechanism by which ZMM proteins directly couple crossover formation to SC central element assembly.\",\n      \"method\": \"Protein interaction assay (specific method not detailed in abstract), comparative analysis with yeast Zip4-Ecm11 interaction\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single mention in abstract without detailed methodological description of the mammalian TEX11-TEX12 interaction experiment\",\n      \"pmids\": [\"34969823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"X-ray crystal structures of TEX12 mutants reveal three distinct conformations; solution scattering (SAXS/light scattering) determines that wild-type TEX12 adopts a dimeric four-helical coiled-coil structure. Mutations in TEX12's C-terminal tip (the region that drives SYCE2-TEX12 fibrous assembly in the SC) cause conformational change and alter the oligomeric state of isolated TEX12, demonstrating that the C-terminal tip controls both SYCE2-TEX12 SC assembly and the conformation/oligomerization of TEX12 itself.\",\n      \"method\": \"X-ray crystallography of TEX12 mutants (three conformations), solution SAXS, dynamic light scattering, mutagenesis\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures plus SAXS plus mutagenesis in one study, multiple orthogonal methods establishing structure-function relationship\",\n      \"pmids\": [\"36071143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SYCE3 interacts with the SC central element complexes SYCE1-SIX6OS1 and SYCE2-TEX12, providing a mechanism for their recruitment during SC assembly. SYCE3 also remodels SYCP1 tetramers into 2:1 heterotrimers by binding, disrupting the SYCP1 lattice and establishing a new SYCP1-SYCE3 lattice that recruits CE complexes including SYCE2-TEX12.\",\n      \"method\": \"Biochemical approaches, separation-of-function mutagenesis in mice, pulldown/interaction assays, structural analysis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical reconstitution plus separation-of-function mutagenesis in mice, multiple orthogonal methods establishing SYCE3-SYCE2-TEX12 interaction and its role in SC assembly\",\n      \"pmids\": [\"36635604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The yeast SC central element complex Ecm11-Gmc2 forms a 2:2 hetero-oligomer with architecture and dimensions similar to the mammalian SYCE2-TEX12 complex, and this 2:2 complex formation is essential for SC assembly in vivo, further validating the conserved structural role of the SYCE2-TEX12 type heterocomplex across species.\",\n      \"method\": \"Biochemical reconstitution of Ecm11-Gmc2, biophysical analysis (stoichiometry), targeted mutagenesis in yeast\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous reconstitution and mutagenesis but concerns the yeast ortholog; provides structural parallel to SYCE2-TEX12 but does not directly interrogate TEX12 itself\",\n      \"pmids\": [\"41537827\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TEX12 is an essential meiosis-specific component of the synaptonemal complex (SC) central element that forms a highly stable hetero-oligomeric complex with SYCE2 (2:2 coiled-coil building blocks assembling hierarchically into micrometer-long intermediate-filament-like fibers), which is recruited to the SC via SYCE3-mediated interactions and depends on SYCP1 for chromosomal localization; TEX12 is required for propagation of chromosomal synapsis and maturation of recombination intermediates into crossovers, its C-terminal tip drives both SYCE2-TEX12 fiber assembly and controls TEX12's own oligomeric conformation, PLK1 directly phosphorylates TEX12 to trigger SC disassembly at meiotic prophase exit, and TEX12 also localizes to meiotic centrosomes where phosphorylation at tyrosine 48 mediates centrosome amplification when aberrantly expressed in somatic/cancer cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TEX12 is an essential meiosis-specific structural component of the synaptonemal complex (SC) central element that mediates propagation of chromosomal synapsis and the maturation of recombination intermediates into crossovers [#0, #1]. It functions as an obligate partner of SYCE2, with which it forms a highly stable, constitutive hetero-oligomeric complex (SYCE2 tetramer plus two TEX12 dimers) that spontaneously self-assembles into central-element-like filaments [#3]; crystallographic and biophysical analysis resolves this as 2:2 coiled-coil building blocks that dimerize and associate end-to-end and laterally into micrometer-long, intermediate-filament-like bundled fibers defining the SC midline [#5]. The C-terminal tip of TEX12 governs both its own dimeric coiled-coil conformation/oligomeric state and the SYCE2-TEX12 fibrous assembly reaction [#8]. Chromosomal recruitment of the SYCE2-TEX12 complex depends on SYCP1 and is mediated through SYCE3, which remodels the SYCP1 lattice to dock the central element complexes, while TEX12 in turn stabilizes the opposing SYCP1 N-termini at the transverse-filament/central-element junction [#0, #4, #9]. SC disassembly at the prophase-to-metaphase I transition is triggered by direct PLK1 phosphorylation of TEX12, which drives its removal from the SC [#2]. Beyond meiotic chromosomes, TEX12 localizes to centrosomes, where phosphorylation on tyrosine 48 mediates centrosome amplification when TEX12 is aberrantly expressed in somatic and cancer cells [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established TEX12 as a central element protein and defined its position in the SC interaction network, answering where in the SC TEX12 acts and which partners it depends on.\",\n      \"evidence\": \"Co-IP, immunofluorescence and immunoEM in mouse meiocytes with Sycp1/Syce1/Syce2 knockouts\",\n      \"pmids\": [\"16968740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define stoichiometry or the structural basis of the SYCE2-TEX12 interaction\", \"Direct vs. indirect nature of the SYCE1 link not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated that TEX12 is functionally required not just for SC structure but for synapsis propagation and crossover maturation, linking the central element to recombination outcomes.\",\n      \"evidence\": \"Tex12 knockout mouse with SC structural analysis and recombination marker readouts\",\n      \"pmids\": [\"18611960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism coupling central element assembly to crossover maturation not defined\", \"Whether the recombination defect is direct or secondary to synapsis failure unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the stoichiometry and self-assembly capacity of the SYCE2-TEX12 complex, showing it is the minimal fiber-forming unit of the central element.\",\n      \"evidence\": \"Biochemical reconstitution, AUC/gel filtration and EM of human SYCE2-TEX12\",\n      \"pmids\": [\"22870393\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution architecture of the building block not yet determined\", \"How reconstituted fibers relate to in vivo midline geometry unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the regulated disassembly mechanism, showing PLK1 phosphorylation of TEX12 drives central element removal at prophase exit.\",\n      \"evidence\": \"In vitro PLK1 kinase assay plus PLK1 inhibition (BI 2536) in ex vivo spermatocytes\",\n      \"pmids\": [\"22854038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphosites on TEX12 not mapped\", \"Whether phosphorylation directly destabilizes the SYCE2-TEX12 fiber unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed TEX12 in the interdependent stabilization of opposing SYCP1 N-termini, defining how central element proteins build the transverse-filament junction.\",\n      \"evidence\": \"ImmunoEM in SYCE2/TEX12-deficient meiocytes\",\n      \"pmids\": [\"27103161\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, immunoEM-based; direct TEX12-SYCP1 contact not biochemically demonstrated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided the atomic and hierarchical assembly mechanism, defining SYCE2-TEX12 as an intermediate-filament-like fiber that builds the SC midline.\",\n      \"evidence\": \"X-ray crystallography, SAXS/AUC/SEC-MALS, mutagenesis and EM\",\n      \"pmids\": [\"34373646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo fiber dimensions and dynamics not directly imaged\", \"Contribution of other CE proteins to native fiber assembly not captured in reconstitution\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed a meiosis-independent centrosomal role for TEX12 and a pathological function when ectopically expressed, implicating Y48 phosphorylation in centrosome amplification.\",\n      \"evidence\": \"Immunofluorescence, ectopic expression, Y48 phospho-mutant, siRNA and retinoic acid assays in somatic/cancer cells\",\n      \"pmids\": [\"34880391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Kinase responsible for Y48 phosphorylation unidentified\", \"Mechanism of centrosome amplification not defined\", \"Single lab, requires independent confirmation\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Proposed a direct ZMM-to-central-element link via TEX11-TEX12 interaction, coupling crossover machinery to SC assembly.\",\n      \"evidence\": \"Protein interaction assay (method not detailed) with comparison to yeast Zip4-Ecm11\",\n      \"pmids\": [\"34969823\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Mammalian TEX11-TEX12 interaction method undescribed and not independently validated\", \"Functional consequence of the interaction not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mapped the TEX12 C-terminal tip as the dual control element governing both TEX12's own oligomeric conformation and SYCE2-TEX12 fiber assembly.\",\n      \"evidence\": \"X-ray crystallography of TEX12 mutants, SAXS, dynamic light scattering and mutagenesis\",\n      \"pmids\": [\"36071143\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo consequence of tip mutations on synapsis not tested\", \"How conformational switching is regulated in cells unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined SYCE3 as the recruiter of SYCE2-TEX12, showing it remodels the SYCP1 lattice to dock central element complexes.\",\n      \"evidence\": \"Biochemistry, separation-of-function mutagenesis in mice, pulldowns and structural analysis\",\n      \"pmids\": [\"36635604\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Temporal ordering of SYCE3 remodeling relative to TEX12 fiber growth not resolved\", \"Direct SYCE3-TEX12 contact surface not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Validated cross-species conservation of the 2:2 heterocomplex architecture via the yeast Ecm11-Gmc2 ortholog, reinforcing the structural principle underlying SYCE2-TEX12.\",\n      \"evidence\": \"Reconstitution and biophysics of yeast Ecm11-Gmc2 with in vivo mutagenesis\",\n      \"pmids\": [\"41537827\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Concerns yeast orthologs and does not directly interrogate mammalian TEX12\", \"Sequence-level conservation of TEX12 interfaces not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TEX12's centrosomal/oncogenic function mechanistically relates to its SC structural role, and how phosphoregulation (PLK1, Y48) integrates assembly and disassembly, remain open.\",\n      \"evidence\": \"No single study in the timeline reconciles the meiotic and centrosomal functions\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Kinase for Y48 and full PLK1 phosphosite map unknown\", \"Direct mechanism of centrosome amplification undefined\", \"No structural model of TEX12 at the centrosome\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 5, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\"SYCE2-TEX12 central element complex\", \"synaptonemal complex central element\"],\n    \"partners\": [\"SYCE2\", \"SYCE3\", \"SYCP1\", \"SYCE1\", \"PLK1\", \"TEX11\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}