{"gene":"BOLL","run_date":"2026-06-09T22:02:45","timeline":{"discoveries":[{"year":1999,"finding":"Drosophila Boule (ortholog of human BOLL/BOULE) post-transcriptionally regulates Twine (a Cdc25-type phosphatase) translation: boule mutations markedly reduce Twine protein expression from twine mRNA, and heterologous expression of Twine rescues the boule meiotic-entry defect, establishing that the essential function of Boule at the G2-to-M transition in meiosis is translational control of Twine.","method":"Genetic epistasis (double mutant analysis), rescue experiment (heterologous Twine expression in boule mutant flies), quantitative protein expression analysis","journal":"Nature Cell Biology","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — genetic epistasis combined with rescue experiment and protein expression analysis in a single focused study; independently supported by multiple subsequent papers","pmids":["10559904"],"is_preprint":false},{"year":1998,"finding":"Drosophila Boule protein undergoes biphasic subcellular localization during spermatogenesis: it localizes premeiotically to a perinucleolar region and then translocates to the cytoplasm at the onset of meiosis. Deletion of the Y chromosome ks-1 fertility locus eliminates Boule nuclear localization without perturbing meiotic entry, suggesting Boule acts in the cytoplasm to regulate mRNA stability or translation of an essential meiotic factor.","method":"Immunolocalization/subcellular fractionation in Drosophila testis; genetic deletion analysis (Y chromosome ks-1 locus)","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2/3 / Moderate — direct localization experiment with functional inference; single lab, two orthogonal approaches (immunolocalization + genetic deletion)","pmids":["9882490"],"is_preprint":false},{"year":1998,"finding":"Xdazl (Xenopus DAZ-like, ortholog of BOLL/BOULE family) functions as an RNA-binding protein in vitro, and its cDNA rescues the boule meiotic entry phenotype in Drosophila boule mutant flies (restoring spindle formation, histone H3 phosphorylation, and meiotic cell division completion), demonstrating functional conservation of the meiotic RNA-binding role across species.","method":"In vitro RNA-binding assay; transgenic rescue of Drosophila boule mutant phenotype","journal":"Development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical assay combined with transgenic cross-species rescue experiment in a single study","pmids":["9486791"],"is_preprint":false},{"year":2003,"finding":"Human BOULE transgene advances meiosis in infertile Drosophila boule mutant flies, demonstrating that human BOULE protein functionally substitutes for Drosophila Boule in regulating meiotic progression and that this function is conserved from flies to humans.","method":"Transgenic rescue experiment: human BOULE cDNA introduced into boule mutant Drosophila; meiotic progression assessed","journal":"Human Molecular Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct transgenic rescue across phyla; independently replicated by Maines & Wasserman 1999 and Xu et al. 2003","pmids":["12499397"],"is_preprint":false},{"year":2009,"finding":"Human DAZL functions in primordial germ-cell formation from human embryonic stem cells, whereas human BOULE (BOLL) promotes later stages of meiosis and development of haploid gametes, as established by silencing and overexpression of these genes in a germ-cell reporter system.","method":"Gene silencing (knockdown) and overexpression in human ES cell-derived germ cells; germ cell reporter quantification and isolation; flow cytometry","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function and gain-of-function with defined cellular phenotypic readout in human ES cells; published in high-impact journal with multiple orthogonal methods","pmids":["19865085"],"is_preprint":false},{"year":2010,"finding":"Mouse Boule knockout reveals a novel role for Boule in spermiogenesis (differentiation of round spermatids into mature spermatozoa) rather than meiosis: meiosis completes normally in Boule-/- mice and haploid round spermatids form, but round spermatids arrest at step 6 and fail to differentiate into mature sperm; expression of key regulators of spermiogenesis is unaffected, suggesting Boule acts through a novel pathway.","method":"Knockout mouse generation (Boule-/- mice); histological analysis of spermatogenesis stages; Western blot for spermiogenesis regulators","journal":"Human Molecular Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined stage-specific phenotypic readout and molecular characterization; single lab with multiple orthogonal methods","pmids":["20335278"],"is_preprint":false},{"year":2009,"finding":"Human BOLL protein specifically binds a 21-nucleotide region of the CDC25A 3'UTR (with a critical U-rich sequence within it), stimulates CDC25A translation without altering mRNA stability, and CDC25A and BOLL protein levels are co-reduced in human testes with spermatogenic failure/meiotic arrest, establishing post-transcriptional translational control of CDC25A by BOLL as a conserved fertility mechanism.","method":"RNA immunoprecipitation/binding assay (identification of 21-nt binding site in CDC25A 3'UTR); in vitro translation assay; mRNA stability assay; protein/mRNA expression correlation in human testis biopsies","journal":"Journal of Clinical Endocrinology and Metabolism","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro RNA-binding assay with mutagenesis mapping of binding site, translational assay, and clinical correlation; single lab with multiple orthogonal methods","pmids":["19417033"],"is_preprint":false},{"year":2005,"finding":"Human BOL (BOULE) forms homodimers and interacts with PUMILIO homolog PUM2; the domain of BOL required for dimerization and PUM2 interaction was mapped. BOL and PUM2 form a complex on a subset of PUM2 RNA targets distinct from targets bound by PUM2-DAZL complexes, suggesting that BOL determines RNA target specificity of PUM2 through protein-protein interaction.","method":"Co-immunoprecipitation; domain mapping by deletion/mutagenesis; RNA-binding assays to identify RNA targets of BOL-PUM2 complex","journal":"Molecular Reproduction and Development","confidence":"Medium","confidence_rationale":"Tier 2/3 / Moderate — Co-IP with domain mapping and RNA target identification; single lab with two orthogonal methods","pmids":["15806553"],"is_preprint":false},{"year":2008,"finding":"In Drosophila, an isoform of Boule is expressed in the nervous system (not only testis), and forced overexpression of Boule in mushroom body gamma neurons inhibits developmental axon pruning. This activity requires both the RNA-binding domain and the conserved DAZ domain. Genetic analysis indicates Boule functions in the Cdc25 phosphatase (Twine) pathway in the nervous system as well as the germline.","method":"Genomic microarray (expression profiling); forced expression in mushroom body neurons; genetic epistasis (Boule overexpression + twine loss-of-function); domain deletion analysis","journal":"Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain deletion plus genetic epistasis in a defined cellular context; single lab with multiple methods","pmids":["18550751"],"is_preprint":false},{"year":2004,"finding":"A nervous-system-expressed isoform of Drosophila Boule, when overexpressed, causes mutant phenotypes in neural communication (eye receptor-to-laminar cell signaling), altered larval locomotion, and reduced viability. Genetic studies indicate Boule functions via the Cdc25 phosphatase (Twine) pathway in the nervous system, and a twine loss-of-function mutation in a Boule-overexpression background reveals a role for Twine Cdc25 in the adult nervous system.","method":"Isoform-specific overexpression in Drosophila nervous system; electrophysiological/behavioral phenotypic analysis; genetic epistasis (Boule overexpression + twine loss-of-function)","journal":"Journal of Neurogenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with defined neural phenotype; single lab, multiple orthogonal readouts","pmids":["15370196"],"is_preprint":false},{"year":2016,"finding":"Promoters of BOULE and DAZL exhibit differential DNA methylation consistent with their gonad-specific expression; low promoter methylation in testicular tissue is attributed to spermatogenic cells; this conserved differential methylation is present in orthologous promoters of diverse species including mammals, chicken, and fish. Hypermethylation of BOULE promoter in human sperm is associated with human infertility, establishing epigenetic (DNA methylation) regulation as a mechanism controlling gonad-specific BOULE expression.","method":"Bisulfite sequencing; methylation analysis of testicular cell subpopulations; comparative genomics across species; correlation of promoter methylation with infertility phenotype","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — bisulfite sequencing across multiple species with clinical correlation; single lab, multiple species as orthogonal evidence","pmids":["27358391"],"is_preprint":false},{"year":2022,"finding":"Mouse BOULE forms SDS-resistant amyloid-like aggregates in testis during spermatogenesis; aggregate formation correlates with spermatogenic developmental stage and is absent in Boule knockout testis. A small region immediately downstream of the DAZ repeats is essential for in vitro aggregation, and aggregation positively correlates with temperature. Enhanced UV cross-linking immunoprecipitation of BOULE aggregates from mouse testes shows they bind numerous spermatogenesis-related mRNAs.","method":"SDS-PAGE resistance assay for aggregates; Boule knockout validation; domain mapping (in vitro aggregation with deletion constructs); temperature dependence assay; eCLIP-seq (enhanced UV cross-linking immunoprecipitation) of BOULE aggregates","journal":"Journal of Biomedical Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (SDS-resistance, KO validation, domain mapping, eCLIP); single lab","pmids":["35965435"],"is_preprint":false},{"year":2006,"finding":"Three isoforms of human BOULE (B1, B2, B3) were identified, differing only in N-terminal sequences encoded by alternatively spliced exon 1. All three isoforms are exclusively expressed in human testes. Altered B1/B2 and B1/B3 transcript ratios correlate with reduced meiotic capacity of spermatocytes. BOULE mRNA reduction in meiotic arrest biopsies parallels absence of BOULE protein.","method":"RT-PCR identification of isoforms; quantitative RT-PCR in testis biopsies from infertile men; flow cytometry for meiotic capacity; immunohistochemistry for BOULE protein","journal":"Molecular Human Reproduction","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple methods (RT-PCR, qPCR, flow cytometry, IHC) in human clinical samples; single lab","pmids":["17114206"],"is_preprint":false},{"year":2015,"finding":"In Athalia rosae (haploid hymenopteran), Ar bol (boule ortholog) is exclusively expressed in testis when maturation divisions occur, and knockdown of all bol transcripts arrests the cell cycle before maturation divisions (shown by flow cytometry), prevents mature sperm formation, and blocks sperm differentiation. This is genetically upstream of Ar cdc25, as cdc25 knockdown alone permits partial sperm elongation. Thus boule is essential for meiotic entry and progression via cdc25 regulation even in haploid males.","method":"RNAi knockdown; flow cytometry for cell cycle analysis; stage-specific expression analysis; epistasis between bol and cdc25 knockdowns","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi loss-of-function with cell cycle readout and genetic epistasis; single lab","pmids":["25592223"],"is_preprint":false},{"year":2020,"finding":"Deletion of porcine BOLL gene (55 kb deletion encompassing the BOLL locus) in Yorkshire boars in the homozygous state causes defective acrosome formation in sperm and subfertility, revealing a novel role for BOLL in acrosome formation during spermatogenesis in pigs.","method":"Genome sequencing; read depth/copy number analysis identifying 55 kb deletion; association mapping; phenotypic characterization of acrosome defects","journal":"Animal Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — whole-genome sequencing with deletion mapping and phenotypic characterization; single study, natural loss-of-function variant","pmids":["32975846"],"is_preprint":false},{"year":2014,"finding":"IGF1 increases BOULE mRNA expression in mouse testis via ERK1/2 signaling in a testosterone-independent pathway; antiandrogen flutamide abolished testosterone-induced BOULE mRNA increase but not IGF1-induced increase; ERK1/2 inhibitor U0126 prevented IGF1-induction of both BOULE and CDC25A mRNAs, placing IGF1-ERK1/2 signaling upstream of BOULE and CDC25A expression during spermatogenesis.","method":"In vitro testis incubation with hormones/inhibitors; RT-PCR/qPCR for BOULE and CDC25A mRNA; pharmacological inhibition (flutamide, U0126); immunohistochemical localization","journal":"Reproductive Biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacological in vitro testis assay, single lab, single method per condition","pmids":["25726377"],"is_preprint":false},{"year":2015,"finding":"In vitro methylation of the bovine Boule core promoter by M.SssI methylase significantly decreases promoter activity; treatment of bovine cells with the methyltransferase inhibitor 5-Aza-dC dramatically increases bBoule transcription; the core promoter region of bBoule (107 bp) is hypermethylated in infertile cattle-yak hybrids with low bBoule expression, establishing that DNA methylation of the core promoter mechanistically represses bBoule transcription.","method":"In vitro methylation assay with M.SssI; luciferase reporter assay; 5-Aza-dC treatment; bisulfite sequencing","journal":"PloS One","confidence":"Medium","confidence_rationale":"Tier 1/2 / Moderate — in vitro methylation + reporter assay + inhibitor treatment; single lab with multiple orthogonal methods","pmids":["26030766"],"is_preprint":false},{"year":2013,"finding":"BOLL protein is expressed in the human fetal ovary at a developmental stage later than and almost mutually exclusive with DAZL, corresponding to later stages of meiotic prophase I; BOLL is subsequently downregulated as primordial follicles form and DAZL is re-expressed. In fetal mouse ovary, Boll is co-expressed with Dazl during oogenesis, showing species differences. This establishes BOLL as a meiotic-stage-specific protein in human female germ cells.","method":"Immunofluorescence/immunohistochemistry with stage markers in human and mouse fetal ovary; quantification of co-expression with meiosis markers","journal":"PloS One","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct immunolocalization with co-staining of meiotic markers in human and mouse tissue; single lab, two species","pmids":["24086306"],"is_preprint":false}],"current_model":"BOLL/BOULE encodes a conserved, germ-cell-specific RNA-binding protein that promotes meiotic progression and spermiogenesis by post-transcriptionally controlling translation of CDC25-family phosphatases (Twine in Drosophila; CDC25A in humans) via direct binding to a conserved U-rich element in the 3'UTR; it forms homodimers and interacts with PUMILIO-2 (PUM2) to modulate RNA-target specificity, forms amyloid-like aggregates in mammalian testis that associate with spermatogenesis mRNAs, undergoes cytoplasmic translocation at meiotic onset, and is regulated by DNA methylation of its core promoter — with loss of BOLL causing spermiogenic arrest in mice, defective acrosome formation in pigs, and meiotic arrest in humans."},"narrative":{"mechanistic_narrative":"BOLL (BOULE) encodes a germ-cell-specific RNA-binding protein that acts as a post-transcriptional regulator of meiotic progression and gamete differentiation, with a function conserved from insects to humans [PMID:10559904, PMID:9486791, PMID:12499397]. Its core meiotic activity is translational control of CDC25-family phosphatases: Drosophila Boule promotes Twine translation to drive the G2-to-M meiotic transition [PMID:10559904], and human BOLL directly binds a 21-nucleotide U-rich element in the CDC25A 3'UTR to stimulate CDC25A translation without affecting mRNA stability, a mechanism whose disruption co-reduces BOLL and CDC25A in testes with meiotic arrest [PMID:19417033]. BOLL forms homodimers and complexes with PUMILIO-2 (PUM2), thereby directing PUM2 to a distinct subset of RNA targets [PMID:15806553], and in mammalian testis it assembles into SDS-resistant amyloid-like aggregates that bind numerous spermatogenesis-related mRNAs [PMID:35965435]. Functionally, BOLL acts at later germ-cell stages than its paralog DAZL: it promotes haploid gamete formation in human ES-derived germ cells [PMID:19865085] and is required for post-meiotic differentiation, since mouse Boule knockouts complete meiosis but arrest spermatid development at step 6 [PMID:20335278] and porcine BOLL deletion causes defective acrosome formation [PMID:32975846]. Gonad-specific expression of BOLL is controlled by DNA methylation of its core promoter, with promoter hypermethylation repressing transcription and associating with infertility [PMID:27358391, PMID:26030766]. In humans, reduced BOULE expression accompanies spermatogenic failure and meiotic arrest [PMID:19417033, PMID:17114206].","teleology":[{"year":1998,"claim":"Established where Boule acts within the germ cell and its biochemical class, framing it as a cytoplasmic RNA-binding regulator of meiosis rather than a transcription factor.","evidence":"Immunolocalization and Y-chromosome deletion analysis in Drosophila testis; in vitro RNA-binding assay and cross-species transgenic rescue of Xenopus Xdazl in Drosophila boule mutants","pmids":["9882490","9486791"],"confidence":"Medium","gaps":["Direct RNA targets not identified at this stage","Cytoplasmic mechanism (stability vs translation) inferred, not demonstrated"]},{"year":1999,"claim":"Identified the essential meiotic target of Boule, showing it controls the G2-to-M transition by promoting translation of the Cdc25 phosphatase Twine.","evidence":"Genetic epistasis and heterologous Twine rescue with protein quantification in Drosophila boule mutants","pmids":["10559904"],"confidence":"High","gaps":["Direct RNA binding of Boule to twine mRNA not demonstrated in this study","Mechanism of translational activation unresolved"]},{"year":2003,"claim":"Demonstrated that human BOULE function is conserved across phyla, validating the fly model as relevant to human meiosis.","evidence":"Transgenic rescue of Drosophila boule mutant meiosis by human BOULE cDNA","pmids":["12499397"],"confidence":"High","gaps":["Human RNA targets not addressed","Rescue does not establish endogenous human mechanism"]},{"year":2005,"claim":"Revealed the protein-interaction basis for target selection, showing BOLL homodimerizes and partners with PUM2 to define a distinct set of regulated RNAs.","evidence":"Co-immunoprecipitation, deletion-based domain mapping, and RNA target identification of the BOL-PUM2 complex","pmids":["15806553"],"confidence":"Medium","gaps":["Single lab without reciprocal in vivo validation","Functional consequence of BOL-PUM2 target binding not measured"]},{"year":2009,"claim":"Defined the direct human molecular target and stage of action, distinguishing BOLL (later meiosis/haploid gametes) from DAZL (PGC formation).","evidence":"RNA-binding/IP mapping of a 21-nt CDC25A 3'UTR site, in vitro translation and mRNA-stability assays, clinical testis correlation; knockdown/overexpression in human ES-derived germ cells","pmids":["19417033","19865085"],"confidence":"High","gaps":["Translational activation mechanism on CDC25A not structurally resolved","Full target repertoire beyond CDC25A undefined"]},{"year":2010,"claim":"Uncovered a post-meiotic role distinct from the canonical meiotic-entry function, showing Boule is required for spermatid differentiation in mice.","evidence":"Boule knockout mouse with stage-specific histology and Western blot for spermiogenesis regulators","pmids":["20335278"],"confidence":"High","gaps":["The 'novel pathway' downstream of Boule in spermiogenesis unidentified","Spermiogenic RNA targets not defined"]},{"year":2016,"claim":"Established epigenetic control of BOULE, showing core-promoter DNA methylation represses transcription and underlies gonad-specific expression and infertility.","evidence":"Bisulfite sequencing across species, in vitro methylation and luciferase reporter assays, 5-Aza-dC treatment, and infertility correlation in human and bovine systems","pmids":["27358391","26030766"],"confidence":"Medium","gaps":["Trans-acting factors reading the methylation state unidentified","Causality in human infertility is correlative"]},{"year":2022,"claim":"Showed BOULE adopts an amyloid-like aggregated state in testis that binds a broad set of spermatogenesis mRNAs, linking its biophysical behavior to RNA regulation.","evidence":"SDS-resistance assays, knockout validation, in vitro aggregation domain mapping, temperature dependence, and eCLIP-seq of testis aggregates","pmids":["35965435"],"confidence":"Medium","gaps":["Functional consequence of aggregation on translation not established","Single lab; physiological role of temperature dependence unclear"]},{"year":null,"claim":"How BOLL mechanistically promotes translation of CDC25A and its spermiogenic targets, and how homodimerization, PUM2 partnering, and amyloid-like aggregation are integrated into a single regulatory mechanism, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of BOLL on its U-rich RNA element","Spermiogenic target downstream of mouse Boule unidentified","Relationship between aggregated state and active translational control unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[2,6,7,11]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[0,6]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[4,5,6]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,13]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[6,11]}],"complexes":[],"partners":["PUM2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N9W6","full_name":"Protein boule-like","aliases":[],"length_aa":283,"mass_kda":31.3,"function":"Probable RNA-binding protein, which may be required during spermatogenesis. May act by binding to the 3'-UTR of mRNAs and regulating their translation (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q8N9W6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BOLL","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/BOLL","total_profiled":1310},"omim":[{"mim_id":"613760","title":"SOLUTE CARRIER FAMILY 36, MEMBER 4; SLC36A4","url":"https://www.omim.org/entry/613760"},{"mim_id":"609942","title":"NOONAN SYNDROME 3; NS3","url":"https://www.omim.org/entry/609942"},{"mim_id":"608332","title":"SOLUTE CARRIER FAMILY 36 (PROTON/AMINO ACID SYMPORTER), MEMBER 3; SLC36A3","url":"https://www.omim.org/entry/608332"},{"mim_id":"608331","title":"SOLUTE CARRIER FAMILY 36 (PROTON/AMINO ACID SYMPORTER), MEMBER 2; SLC36A2","url":"https://www.omim.org/entry/608331"},{"mim_id":"607785","title":"JUVENILE MYELOMONOCYTIC LEUKEMIA; JMML","url":"https://www.omim.org/entry/607785"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Annulus","reliability":"Approved"},{"location":"Mid piece","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"},{"location":"End piece","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"testis","ntpm":45.7}],"url":"https://www.proteinatlas.org/search/BOLL"},"hgnc":{"alias_symbol":["BOULE"],"prev_symbol":[]},"alphafold":{"accession":"Q8N9W6","domains":[{"cath_id":"3.30.70.330","chopping":"30-111","consensus_level":"high","plddt":93.8632,"start":30,"end":111}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N9W6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N9W6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N9W6-F1-predicted_aligned_error_v6.png","plddt_mean":63.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BOLL","jax_strain_url":"https://www.jax.org/strain/search?query=BOLL"},"sequence":{"accession":"Q8N9W6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N9W6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N9W6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N9W6"}},"corpus_meta":[{"pmid":"19865085","id":"PMC_19865085","title":"Human 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Coker 312) positively affects plant vegetative growth, boll number and seed cotton yield.","date":"2015","source":"Functional plant biology : FPB","url":"https://pubmed.ncbi.nlm.nih.gov/32480732","citation_count":7,"is_preprint":false},{"pmid":"23949719","id":"PMC_23949719","title":"Field evaluation of Bt cotton crop impact on nontarget pests: cotton aphid and boll weevil.","date":"2012","source":"Neotropical entomology","url":"https://pubmed.ncbi.nlm.nih.gov/23949719","citation_count":7,"is_preprint":false},{"pmid":"28495035","id":"PMC_28495035","title":"Selection of Bacillus thuringiensis strains toxic to cotton boll weevil (Anthonomus grandis, Coleoptera: Curculionidae) larvae.","date":"2017","source":"Revista Argentina de microbiologia","url":"https://pubmed.ncbi.nlm.nih.gov/28495035","citation_count":7,"is_preprint":false},{"pmid":"15215586","id":"PMC_15215586","title":"Molecular cloning of a cysteine proteinase cDNA from the cotton boll weevil Anthonomus grandis (Coleoptera: Curculionidae).","date":"2004","source":"Bioscience, biotechnology, and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15215586","citation_count":7,"is_preprint":false},{"pmid":"29778921","id":"PMC_29778921","title":"Goat Boule: Isoforms identification, mRNA expression in testis and functional study and promoter methylation profiles.","date":"2018","source":"Theriogenology","url":"https://pubmed.ncbi.nlm.nih.gov/29778921","citation_count":6,"is_preprint":false},{"pmid":"19342699","id":"PMC_19342699","title":"Phenotypic expression of partial AZFc deletions is independent of the variations in DAZL and BOULE in a Han population.","date":"2009","source":"Journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/19342699","citation_count":6,"is_preprint":false},{"pmid":"32975846","id":"PMC_32975846","title":"Deletion of porcine BOLL is associated with defective acrosomes and subfertility in Yorkshire boars.","date":"2020","source":"Animal genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32975846","citation_count":6,"is_preprint":false},{"pmid":"36598610","id":"PMC_36598610","title":"A novel picorna-like virus identified in the cotton boll weevil Anthonomus grandis (Coleoptera: Curculionidae).","date":"2023","source":"Archives of virology","url":"https://pubmed.ncbi.nlm.nih.gov/36598610","citation_count":6,"is_preprint":false},{"pmid":"26558603","id":"PMC_26558603","title":"Stable integration and expression of a cry1Ia gene conferring resistance to fall armyworm and boll weevil in cotton plants.","date":"2015","source":"Pest management science","url":"https://pubmed.ncbi.nlm.nih.gov/26558603","citation_count":6,"is_preprint":false},{"pmid":"23007974","id":"PMC_23007974","title":"Combining ability analysis for within-boll yield components in upland cotton (Gossypium hirsutum L.).","date":"2012","source":"Genetics and molecular research : GMR","url":"https://pubmed.ncbi.nlm.nih.gov/23007974","citation_count":6,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51144,"output_tokens":4842,"usd":0.113031,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13081,"output_tokens":2854,"usd":0.068377,"stage2_stop_reason":"end_turn"},"total_usd":0.181408,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"Drosophila Boule (ortholog of human BOLL/BOULE) post-transcriptionally regulates Twine (a Cdc25-type phosphatase) translation: boule mutations markedly reduce Twine protein expression from twine mRNA, and heterologous expression of Twine rescues the boule meiotic-entry defect, establishing that the essential function of Boule at the G2-to-M transition in meiosis is translational control of Twine.\",\n      \"method\": \"Genetic epistasis (double mutant analysis), rescue experiment (heterologous Twine expression in boule mutant flies), quantitative protein expression analysis\",\n      \"journal\": \"Nature Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — genetic epistasis combined with rescue experiment and protein expression analysis in a single focused study; independently supported by multiple subsequent papers\",\n      \"pmids\": [\"10559904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Drosophila Boule protein undergoes biphasic subcellular localization during spermatogenesis: it localizes premeiotically to a perinucleolar region and then translocates to the cytoplasm at the onset of meiosis. Deletion of the Y chromosome ks-1 fertility locus eliminates Boule nuclear localization without perturbing meiotic entry, suggesting Boule acts in the cytoplasm to regulate mRNA stability or translation of an essential meiotic factor.\",\n      \"method\": \"Immunolocalization/subcellular fractionation in Drosophila testis; genetic deletion analysis (Y chromosome ks-1 locus)\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 / Moderate — direct localization experiment with functional inference; single lab, two orthogonal approaches (immunolocalization + genetic deletion)\",\n      \"pmids\": [\"9882490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Xdazl (Xenopus DAZ-like, ortholog of BOLL/BOULE family) functions as an RNA-binding protein in vitro, and its cDNA rescues the boule meiotic entry phenotype in Drosophila boule mutant flies (restoring spindle formation, histone H3 phosphorylation, and meiotic cell division completion), demonstrating functional conservation of the meiotic RNA-binding role across species.\",\n      \"method\": \"In vitro RNA-binding assay; transgenic rescue of Drosophila boule mutant phenotype\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical assay combined with transgenic cross-species rescue experiment in a single study\",\n      \"pmids\": [\"9486791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human BOULE transgene advances meiosis in infertile Drosophila boule mutant flies, demonstrating that human BOULE protein functionally substitutes for Drosophila Boule in regulating meiotic progression and that this function is conserved from flies to humans.\",\n      \"method\": \"Transgenic rescue experiment: human BOULE cDNA introduced into boule mutant Drosophila; meiotic progression assessed\",\n      \"journal\": \"Human Molecular Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct transgenic rescue across phyla; independently replicated by Maines & Wasserman 1999 and Xu et al. 2003\",\n      \"pmids\": [\"12499397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human DAZL functions in primordial germ-cell formation from human embryonic stem cells, whereas human BOULE (BOLL) promotes later stages of meiosis and development of haploid gametes, as established by silencing and overexpression of these genes in a germ-cell reporter system.\",\n      \"method\": \"Gene silencing (knockdown) and overexpression in human ES cell-derived germ cells; germ cell reporter quantification and isolation; flow cytometry\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function and gain-of-function with defined cellular phenotypic readout in human ES cells; published in high-impact journal with multiple orthogonal methods\",\n      \"pmids\": [\"19865085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mouse Boule knockout reveals a novel role for Boule in spermiogenesis (differentiation of round spermatids into mature spermatozoa) rather than meiosis: meiosis completes normally in Boule-/- mice and haploid round spermatids form, but round spermatids arrest at step 6 and fail to differentiate into mature sperm; expression of key regulators of spermiogenesis is unaffected, suggesting Boule acts through a novel pathway.\",\n      \"method\": \"Knockout mouse generation (Boule-/- mice); histological analysis of spermatogenesis stages; Western blot for spermiogenesis regulators\",\n      \"journal\": \"Human Molecular Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined stage-specific phenotypic readout and molecular characterization; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20335278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human BOLL protein specifically binds a 21-nucleotide region of the CDC25A 3'UTR (with a critical U-rich sequence within it), stimulates CDC25A translation without altering mRNA stability, and CDC25A and BOLL protein levels are co-reduced in human testes with spermatogenic failure/meiotic arrest, establishing post-transcriptional translational control of CDC25A by BOLL as a conserved fertility mechanism.\",\n      \"method\": \"RNA immunoprecipitation/binding assay (identification of 21-nt binding site in CDC25A 3'UTR); in vitro translation assay; mRNA stability assay; protein/mRNA expression correlation in human testis biopsies\",\n      \"journal\": \"Journal of Clinical Endocrinology and Metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro RNA-binding assay with mutagenesis mapping of binding site, translational assay, and clinical correlation; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"19417033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human BOL (BOULE) forms homodimers and interacts with PUMILIO homolog PUM2; the domain of BOL required for dimerization and PUM2 interaction was mapped. BOL and PUM2 form a complex on a subset of PUM2 RNA targets distinct from targets bound by PUM2-DAZL complexes, suggesting that BOL determines RNA target specificity of PUM2 through protein-protein interaction.\",\n      \"method\": \"Co-immunoprecipitation; domain mapping by deletion/mutagenesis; RNA-binding assays to identify RNA targets of BOL-PUM2 complex\",\n      \"journal\": \"Molecular Reproduction and Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 / Moderate — Co-IP with domain mapping and RNA target identification; single lab with two orthogonal methods\",\n      \"pmids\": [\"15806553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In Drosophila, an isoform of Boule is expressed in the nervous system (not only testis), and forced overexpression of Boule in mushroom body gamma neurons inhibits developmental axon pruning. This activity requires both the RNA-binding domain and the conserved DAZ domain. Genetic analysis indicates Boule functions in the Cdc25 phosphatase (Twine) pathway in the nervous system as well as the germline.\",\n      \"method\": \"Genomic microarray (expression profiling); forced expression in mushroom body neurons; genetic epistasis (Boule overexpression + twine loss-of-function); domain deletion analysis\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain deletion plus genetic epistasis in a defined cellular context; single lab with multiple methods\",\n      \"pmids\": [\"18550751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A nervous-system-expressed isoform of Drosophila Boule, when overexpressed, causes mutant phenotypes in neural communication (eye receptor-to-laminar cell signaling), altered larval locomotion, and reduced viability. Genetic studies indicate Boule functions via the Cdc25 phosphatase (Twine) pathway in the nervous system, and a twine loss-of-function mutation in a Boule-overexpression background reveals a role for Twine Cdc25 in the adult nervous system.\",\n      \"method\": \"Isoform-specific overexpression in Drosophila nervous system; electrophysiological/behavioral phenotypic analysis; genetic epistasis (Boule overexpression + twine loss-of-function)\",\n      \"journal\": \"Journal of Neurogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with defined neural phenotype; single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"15370196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Promoters of BOULE and DAZL exhibit differential DNA methylation consistent with their gonad-specific expression; low promoter methylation in testicular tissue is attributed to spermatogenic cells; this conserved differential methylation is present in orthologous promoters of diverse species including mammals, chicken, and fish. Hypermethylation of BOULE promoter in human sperm is associated with human infertility, establishing epigenetic (DNA methylation) regulation as a mechanism controlling gonad-specific BOULE expression.\",\n      \"method\": \"Bisulfite sequencing; methylation analysis of testicular cell subpopulations; comparative genomics across species; correlation of promoter methylation with infertility phenotype\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — bisulfite sequencing across multiple species with clinical correlation; single lab, multiple species as orthogonal evidence\",\n      \"pmids\": [\"27358391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Mouse BOULE forms SDS-resistant amyloid-like aggregates in testis during spermatogenesis; aggregate formation correlates with spermatogenic developmental stage and is absent in Boule knockout testis. A small region immediately downstream of the DAZ repeats is essential for in vitro aggregation, and aggregation positively correlates with temperature. Enhanced UV cross-linking immunoprecipitation of BOULE aggregates from mouse testes shows they bind numerous spermatogenesis-related mRNAs.\",\n      \"method\": \"SDS-PAGE resistance assay for aggregates; Boule knockout validation; domain mapping (in vitro aggregation with deletion constructs); temperature dependence assay; eCLIP-seq (enhanced UV cross-linking immunoprecipitation) of BOULE aggregates\",\n      \"journal\": \"Journal of Biomedical Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (SDS-resistance, KO validation, domain mapping, eCLIP); single lab\",\n      \"pmids\": [\"35965435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Three isoforms of human BOULE (B1, B2, B3) were identified, differing only in N-terminal sequences encoded by alternatively spliced exon 1. All three isoforms are exclusively expressed in human testes. Altered B1/B2 and B1/B3 transcript ratios correlate with reduced meiotic capacity of spermatocytes. BOULE mRNA reduction in meiotic arrest biopsies parallels absence of BOULE protein.\",\n      \"method\": \"RT-PCR identification of isoforms; quantitative RT-PCR in testis biopsies from infertile men; flow cytometry for meiotic capacity; immunohistochemistry for BOULE protein\",\n      \"journal\": \"Molecular Human Reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple methods (RT-PCR, qPCR, flow cytometry, IHC) in human clinical samples; single lab\",\n      \"pmids\": [\"17114206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In Athalia rosae (haploid hymenopteran), Ar bol (boule ortholog) is exclusively expressed in testis when maturation divisions occur, and knockdown of all bol transcripts arrests the cell cycle before maturation divisions (shown by flow cytometry), prevents mature sperm formation, and blocks sperm differentiation. This is genetically upstream of Ar cdc25, as cdc25 knockdown alone permits partial sperm elongation. Thus boule is essential for meiotic entry and progression via cdc25 regulation even in haploid males.\",\n      \"method\": \"RNAi knockdown; flow cytometry for cell cycle analysis; stage-specific expression analysis; epistasis between bol and cdc25 knockdowns\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi loss-of-function with cell cycle readout and genetic epistasis; single lab\",\n      \"pmids\": [\"25592223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Deletion of porcine BOLL gene (55 kb deletion encompassing the BOLL locus) in Yorkshire boars in the homozygous state causes defective acrosome formation in sperm and subfertility, revealing a novel role for BOLL in acrosome formation during spermatogenesis in pigs.\",\n      \"method\": \"Genome sequencing; read depth/copy number analysis identifying 55 kb deletion; association mapping; phenotypic characterization of acrosome defects\",\n      \"journal\": \"Animal Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — whole-genome sequencing with deletion mapping and phenotypic characterization; single study, natural loss-of-function variant\",\n      \"pmids\": [\"32975846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"IGF1 increases BOULE mRNA expression in mouse testis via ERK1/2 signaling in a testosterone-independent pathway; antiandrogen flutamide abolished testosterone-induced BOULE mRNA increase but not IGF1-induced increase; ERK1/2 inhibitor U0126 prevented IGF1-induction of both BOULE and CDC25A mRNAs, placing IGF1-ERK1/2 signaling upstream of BOULE and CDC25A expression during spermatogenesis.\",\n      \"method\": \"In vitro testis incubation with hormones/inhibitors; RT-PCR/qPCR for BOULE and CDC25A mRNA; pharmacological inhibition (flutamide, U0126); immunohistochemical localization\",\n      \"journal\": \"Reproductive Biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacological in vitro testis assay, single lab, single method per condition\",\n      \"pmids\": [\"25726377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In vitro methylation of the bovine Boule core promoter by M.SssI methylase significantly decreases promoter activity; treatment of bovine cells with the methyltransferase inhibitor 5-Aza-dC dramatically increases bBoule transcription; the core promoter region of bBoule (107 bp) is hypermethylated in infertile cattle-yak hybrids with low bBoule expression, establishing that DNA methylation of the core promoter mechanistically represses bBoule transcription.\",\n      \"method\": \"In vitro methylation assay with M.SssI; luciferase reporter assay; 5-Aza-dC treatment; bisulfite sequencing\",\n      \"journal\": \"PloS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1/2 / Moderate — in vitro methylation + reporter assay + inhibitor treatment; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"26030766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BOLL protein is expressed in the human fetal ovary at a developmental stage later than and almost mutually exclusive with DAZL, corresponding to later stages of meiotic prophase I; BOLL is subsequently downregulated as primordial follicles form and DAZL is re-expressed. In fetal mouse ovary, Boll is co-expressed with Dazl during oogenesis, showing species differences. This establishes BOLL as a meiotic-stage-specific protein in human female germ cells.\",\n      \"method\": \"Immunofluorescence/immunohistochemistry with stage markers in human and mouse fetal ovary; quantification of co-expression with meiosis markers\",\n      \"journal\": \"PloS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct immunolocalization with co-staining of meiotic markers in human and mouse tissue; single lab, two species\",\n      \"pmids\": [\"24086306\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BOLL/BOULE encodes a conserved, germ-cell-specific RNA-binding protein that promotes meiotic progression and spermiogenesis by post-transcriptionally controlling translation of CDC25-family phosphatases (Twine in Drosophila; CDC25A in humans) via direct binding to a conserved U-rich element in the 3'UTR; it forms homodimers and interacts with PUMILIO-2 (PUM2) to modulate RNA-target specificity, forms amyloid-like aggregates in mammalian testis that associate with spermatogenesis mRNAs, undergoes cytoplasmic translocation at meiotic onset, and is regulated by DNA methylation of its core promoter — with loss of BOLL causing spermiogenic arrest in mice, defective acrosome formation in pigs, and meiotic arrest in humans.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BOLL (BOULE) encodes a germ-cell-specific RNA-binding protein that acts as a post-transcriptional regulator of meiotic progression and gamete differentiation, with a function conserved from insects to humans [#0, #2, #3]. Its core meiotic activity is translational control of CDC25-family phosphatases: Drosophila Boule promotes Twine translation to drive the G2-to-M meiotic transition [#0], and human BOLL directly binds a 21-nucleotide U-rich element in the CDC25A 3'UTR to stimulate CDC25A translation without affecting mRNA stability, a mechanism whose disruption co-reduces BOLL and CDC25A in testes with meiotic arrest [#6]. BOLL forms homodimers and complexes with PUMILIO-2 (PUM2), thereby directing PUM2 to a distinct subset of RNA targets [#7], and in mammalian testis it assembles into SDS-resistant amyloid-like aggregates that bind numerous spermatogenesis-related mRNAs [#11]. Functionally, BOLL acts at later germ-cell stages than its paralog DAZL: it promotes haploid gamete formation in human ES-derived germ cells [#4] and is required for post-meiotic differentiation, since mouse Boule knockouts complete meiosis but arrest spermatid development at step 6 [#5] and porcine BOLL deletion causes defective acrosome formation [#14]. Gonad-specific expression of BOLL is controlled by DNA methylation of its core promoter, with promoter hypermethylation repressing transcription and associating with infertility [#10, #16]. In humans, reduced BOULE expression accompanies spermatogenic failure and meiotic arrest [#6, #12].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established where Boule acts within the germ cell and its biochemical class, framing it as a cytoplasmic RNA-binding regulator of meiosis rather than a transcription factor.\",\n      \"evidence\": \"Immunolocalization and Y-chromosome deletion analysis in Drosophila testis; in vitro RNA-binding assay and cross-species transgenic rescue of Xenopus Xdazl in Drosophila boule mutants\",\n      \"pmids\": [\"9882490\", \"9486791\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct RNA targets not identified at this stage\", \"Cytoplasmic mechanism (stability vs translation) inferred, not demonstrated\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identified the essential meiotic target of Boule, showing it controls the G2-to-M transition by promoting translation of the Cdc25 phosphatase Twine.\",\n      \"evidence\": \"Genetic epistasis and heterologous Twine rescue with protein quantification in Drosophila boule mutants\",\n      \"pmids\": [\"10559904\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct RNA binding of Boule to twine mRNA not demonstrated in this study\", \"Mechanism of translational activation unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated that human BOULE function is conserved across phyla, validating the fly model as relevant to human meiosis.\",\n      \"evidence\": \"Transgenic rescue of Drosophila boule mutant meiosis by human BOULE cDNA\",\n      \"pmids\": [\"12499397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human RNA targets not addressed\", \"Rescue does not establish endogenous human mechanism\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Revealed the protein-interaction basis for target selection, showing BOLL homodimerizes and partners with PUM2 to define a distinct set of regulated RNAs.\",\n      \"evidence\": \"Co-immunoprecipitation, deletion-based domain mapping, and RNA target identification of the BOL-PUM2 complex\",\n      \"pmids\": [\"15806553\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab without reciprocal in vivo validation\", \"Functional consequence of BOL-PUM2 target binding not measured\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the direct human molecular target and stage of action, distinguishing BOLL (later meiosis/haploid gametes) from DAZL (PGC formation).\",\n      \"evidence\": \"RNA-binding/IP mapping of a 21-nt CDC25A 3'UTR site, in vitro translation and mRNA-stability assays, clinical testis correlation; knockdown/overexpression in human ES-derived germ cells\",\n      \"pmids\": [\"19417033\", \"19865085\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Translational activation mechanism on CDC25A not structurally resolved\", \"Full target repertoire beyond CDC25A undefined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Uncovered a post-meiotic role distinct from the canonical meiotic-entry function, showing Boule is required for spermatid differentiation in mice.\",\n      \"evidence\": \"Boule knockout mouse with stage-specific histology and Western blot for spermiogenesis regulators\",\n      \"pmids\": [\"20335278\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The 'novel pathway' downstream of Boule in spermiogenesis unidentified\", \"Spermiogenic RNA targets not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established epigenetic control of BOULE, showing core-promoter DNA methylation represses transcription and underlies gonad-specific expression and infertility.\",\n      \"evidence\": \"Bisulfite sequencing across species, in vitro methylation and luciferase reporter assays, 5-Aza-dC treatment, and infertility correlation in human and bovine systems\",\n      \"pmids\": [\"27358391\", \"26030766\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trans-acting factors reading the methylation state unidentified\", \"Causality in human infertility is correlative\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed BOULE adopts an amyloid-like aggregated state in testis that binds a broad set of spermatogenesis mRNAs, linking its biophysical behavior to RNA regulation.\",\n      \"evidence\": \"SDS-resistance assays, knockout validation, in vitro aggregation domain mapping, temperature dependence, and eCLIP-seq of testis aggregates\",\n      \"pmids\": [\"35965435\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of aggregation on translation not established\", \"Single lab; physiological role of temperature dependence unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How BOLL mechanistically promotes translation of CDC25A and its spermiogenic targets, and how homodimerization, PUM2 partnering, and amyloid-like aggregation are integrated into a single regulatory mechanism, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of BOLL on its U-rich RNA element\", \"Spermiogenic target downstream of mouse Boule unidentified\", \"Relationship between aggregated state and active translational control unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2, 6, 7, 11]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [4, 5, 6]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 13]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [6, 11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PUM2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}