{"gene":"BOC","run_date":"2026-06-09T22:02:45","timeline":{"discoveries":[{"year":2002,"finding":"BOC associates with CDO to form cis complexes via both their ectodomains and intracellular domains, and positively regulates myogenic differentiation. A soluble BOC ectodomain fusion protein promotes differentiation independently of the intracellular region, while a dominant-negative CDO inhibits BOC's pro-myogenic effects, indicating BOC acts through CDO.","method":"Co-immunoprecipitation, soluble ectodomain fusion protein assays, dominant-negative CDO inhibition, myoblast differentiation assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP of ecto- and intracellular domains, multiple orthogonal functional assays (soluble protein, dominant-negative), replicated finding","pmids":["11782431"],"is_preprint":false},{"year":2006,"finding":"BOC and CDO bind Sonic Hedgehog through a high-affinity interaction with a specific fibronectin repeat that is essential for activity. Ectopic expression of BOC promotes Shh-dependent, cell-autonomous ventral cell fates and non-cell-autonomous ventral expansion consistent with Shh sequestration.","method":"Binding assays (fibronectin repeat domain mapping), ectopic expression in neural tube, genetic loss-of-function","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-mapping binding assays combined with in vivo gain- and loss-of-function experiments, replicated across labs","pmids":["16647304"],"is_preprint":false},{"year":2006,"finding":"BOC binds specifically to Shh and functions as a receptor for Shh in commissural axon guidance. RNAi-mediated knockdown of Boc impairs the ability of commissural axons to turn toward an ectopic Shh source in vitro, and targeted disruption of Boc causes commissural axon misguidance in vivo.","method":"RNAi knockdown, in vitro axon turning assay, mouse genetic knockout, binding assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro turning assay with RNAi, in vivo knockout phenotype, direct binding shown, multiple orthogonal methods","pmids":["17086203"],"is_preprint":false},{"year":2010,"finding":"BOC is enriched in ipsilateral retinal ganglion cells (RGCs) and mediates Shh-dependent repulsion of ipsilateral RGC axons at the optic chiasm. Only Boc-positive RGC axons retract in response to Shh in vitro; Boc mutant RGCs lose this response. In vivo, Boc is required for normal segregation of ipsilateral axons, and ectopic Boc expression in contralateral RGCs prevents their crossing.","method":"In vitro axon retraction assay, Boc knockout mice, gain-of-function ectopic expression in contralateral RGCs","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro functional assay with loss-of-function validation, in vivo gain- and loss-of-function, multiple orthogonal methods","pmids":["20053908"],"is_preprint":false},{"year":2011,"finding":"BOC and GAS1 each form distinct receptor complexes with Ptch1. In cerebellar granule neuron progenitors (CGNPs), Boc, Cdon, and Gas1 have an absolute collective requirement for Hh-dependent proliferation; CGNPs lacking all three molecules show complete loss of Hh-dependent proliferation. A mutated Hh ligand that binds Ptch1 but not Boc/Cdon/Gas1 cannot activate Hh signaling.","method":"Co-immunoprecipitation (Boc/Gas1 with Ptch1), triple genetic knockout in CGNPs, mutant Hh ligand assays, cell proliferation assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP demonstrating distinct complexes, triple KO epistasis, mutant ligand approach, two companion papers from independent labs","pmids":["21664577","21664576"],"is_preprint":false},{"year":2011,"finding":"GAS1, CDO, and BOC play overlapping and essential roles during Hedgehog-mediated ventral neural patterning, with an obligatory collective requirement for HH pathway activity in multiple tissues including early cell fate specification of neural progenitors and later motor neuron progenitor maintenance.","method":"Genetic loss-of-function (single, double, triple knockout mice), HH target gene expression analysis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple compound mutant combinations, multiple tissue contexts, two labs independently reporting","pmids":["21664576"],"is_preprint":false},{"year":2010,"finding":"Boc modifies the holoprosencephaly (HPE) spectrum caused by Cdo loss. Cdo;Boc double mutants display lobar HPE with defects in Shh target gene expression in the forebrain, identifying Boc as a silent HPE modifier gene. Cdo and Boc have selective roles: double mutants do not phenocopy Shh-null mice, indicating evolutionary divergence from Drosophila where Ihog/Boi loss abolishes all Hh response.","method":"Double knockout mouse genetics, Shh target gene expression analysis","journal":"Disease models & mechanisms","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with compound mutants and target gene readouts, single lab but multiple genotypes tested","pmids":["21183473"],"is_preprint":false},{"year":2010,"finding":"All three mammalian Hedgehog proteins (Sonic, Indian, Desert Hh) bind CDO and BOC in the same manner, as demonstrated by biochemical binding assays and X-ray crystal structures of Hh proteins complexed with active domains of CDO and BOC. CDO-Hh interactions are weakened at low pH.","method":"X-ray crystallography, biochemical binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures of CDO/BOC-Hh complexes with biochemical validation, single lab but multiple ligands and structural rigor","pmids":["20519495"],"is_preprint":false},{"year":2010,"finding":"Drosophila Boi is expressed in apical cells of the ovary and suppresses follicle stem cell proliferation by binding to and sequestering Hedgehog on the apical cell surface, thereby inhibiting Hh diffusion to FSCs.","method":"Genetic loss-of-function, cell-specific expression analysis, FSC proliferation assays","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined FSC proliferation readout, mechanism of ligand sequestration inferred from cell-specific expression and KO, single lab","pmids":["21098113"],"is_preprint":false},{"year":2010,"finding":"Drosophila Ihog and Boi are required for accumulation of Smoothened (Smo) in Hh-responsive cells, placing Ihog/Boi upstream of Smo in the Hh pathway. Cells mutant for both ihog and boi fail to activate Hh pathway responses and aberrantly sort out of the anterior wing compartment.","method":"Genetic loss-of-function (double mutant clonal analysis in eye and wing discs), Smo localization assay","journal":"Neural development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clonal double-mutant epistasis with Smo accumulation readout, single lab","pmids":["21044292"],"is_preprint":false},{"year":2012,"finding":"Drosophila Boi (and Ihog) are required to prevent apical dispersion of Hedgehog and aid Hh recycling for basolateral release and long-range gradient formation. Boi and Ihog are components of cytoneme-associated protein complexes with Dally and Shifted/DmWif that regulate Hh distribution.","method":"Genetic loss-of-function in wing disc epithelium, Hh localization imaging, cytoneme analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with Hh localization readout and cytoneme imaging, single lab","pmids":["23276604"],"is_preprint":false},{"year":2013,"finding":"Shh/Boc signaling is required for sustained generation of ipsilateral projecting retinal ganglion cells. In Boc-/- retinas, the number of Zic2-positive iRGCs is reduced and more Islet2/Shh-positive cRGCs are observed, indicating Boc expression is required to sustain Zic2 expression, likely by regulating levels of Shh signaling from neighboring cRGCs.","method":"Boc knockout mice, cell fate marker analysis, in vivo Shh/Boc gain-of-function injection experiments","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO phenotype with specific cell fate markers, gain-of-function rescue, single lab","pmids":["23678105"],"is_preprint":false},{"year":2014,"finding":"BOC associates with Ptch1 and promotes Shh signaling in cerebellar granule cell precursors to drive proliferation. Mechanistically, Boc through elevated Shh signaling promotes high levels of DNA damage mediated by CyclinD1, which increases the incidence of Ptch1 loss of heterozygosity and medulloblastoma progression.","method":"Boc knockout mice, Boc overexpression in GCPs, DNA damage assays, CyclinD1 pathway analysis, LOH analysis","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO and overexpression with mechanistic pathway (CyclinD1-DNA damage-LOH) analysis, single lab","pmids":["25263791"],"is_preprint":false},{"year":2015,"finding":"CDON and BOC use distinct molecular mechanisms to promote Hh signaling despite functional redundancy. Specifically, they have distinct membrane attachment requirements and distinct extracellular motifs required for HH-promoting activity.","method":"In vivo gain-of-function in developing chicken spinal cord, domain deletion/mutation analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo domain structure-function in chick neural tube, multiple domain mutants tested, single lab","pmids":["25848697"],"is_preprint":false},{"year":2016,"finding":"BOC interacts with ABL non-receptor tyrosine kinase through its putative SH2-binding domain, is phosphorylated in an ABL activity-dependent manner, and activates JNK to promote neuronal differentiation and neurite outgrowth. ABL-binding-defective BOC mutants fail to activate JNK or rescue differentiation. Shh treatment enhances JNK activation in a BOC-dependent manner.","method":"Co-immunoprecipitation, ABL-binding domain mutants, JNK activation assays, Boc-/- neural progenitor cells, P19 cell differentiation assays","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mutants and functional rescue in multiple cell types, single lab","pmids":["27871935"],"is_preprint":false},{"year":2019,"finding":"Shh induces BOC internalization into early endosomes via the endocytic adaptor Numb, which binds to BOC. Numb is required for Boc internalization, Shh-mediated growth-cone turning in vitro, and commissural axon guidance in vivo. Shh binding to Boc is required for Ptch1 internalization and growth-cone turning; Shh binding to Ptch1 alone is insufficient. BOC thus acts as a Shh-dependent endocytic platform gating Ptch1 internalization and Shh signaling in axon guidance.","method":"Co-immunoprecipitation (Numb-Boc), endocytosis assays, growth-cone turning assay, Numb knockdown, Boc and Ptch1 internalization imaging","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vitro functional turning assay, in vivo commissural axon guidance, multiple orthogonal approaches establishing mechanism","pmids":["31054872"],"is_preprint":false},{"year":2019,"finding":"BOC is required for developmental myelination and myelin repair. Boc mutant mice display transient decreases in oligodendroglial cell density, delayed myelination, lower myelin basic protein production in adults, and impaired OPC differentiation during repair. Mutant microglia/macrophages also show altered morphology transition in vivo.","method":"Boc knockout mice, oligodendrocyte lineage marker analysis, myelin repair assay (demyelination model), microglial morphology analysis","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined oligodendroglial and myelin readouts, single lab","pmids":["31048318"],"is_preprint":false},{"year":2020,"finding":"Ptch1/Boc and Ptch2/Gas1 form specific hetero-complexes that mediate Smo de-repression with different kinetics. Ptch1-mediated signaling through Boc proceeds through Gli induction, while Ptch2-mediated signaling induces phosphorylation of Creb and Src in parallel to Gli induction, identifying a Ptch2-specific signal pathway. Spatiotemporal expression of Boc versus Gas1 determines distinct HH signaling outcomes.","method":"Co-immunoprecipitation (Ptch1/Boc and Ptch2/Gas1 complexes), knockout mouse genetics, primordial germ cell migration assay, phosphoprotein analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for heterocomplex formation, genetic KO epistasis in PGC migration, phosphoprotein readout, single lab","pmids":["32332736"],"is_preprint":false},{"year":2020,"finding":"BOC acts as a multi-functional regulator of HH signaling during craniofacial development, alternately promoting or restraining HH pathway activity in a tissue-specific fashion. Boc deletion results in facial widening correlating with increased HH target gene expression, and partially ameliorates craniofacial defects in Gas1 null mice.","method":"Single and compound (Gas1;Boc) knockout mice, HH target gene expression analysis, craniofacial morphometric analysis","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — compound genetic KO with target gene readouts in multiple craniofacial structures, single lab","pmids":["33060130"],"is_preprint":false},{"year":2021,"finding":"BOC functions in ligand-producing cells as part of a Dispatched (DISP)-BOC/CDON co-receptor complex that promotes cytoneme occurrence and facilitates vesicular SHH transport via Myosin 10 for signal activation. Cytoneme-mediated SHH deposition onto receiving cells induces rapid (within seconds) receptor-dependent signaling.","method":"Co-immunoprecipitation (DISP-BOC complex), live-cell imaging of cytonemes, Myo10 knockout mice, SHH vesicular transport assay, rapid signaling assay","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for novel complex, live imaging with genetic KO, rapid signaling readout; mechanistic link to cytoneme transport in single lab","pmids":["33570491"],"is_preprint":false},{"year":2021,"finding":"Zebrafish boc is required to maintain pMN progenitors and thereby specify oligodendrocyte fate. A missense mutation in the Fibronectin type III (FN3) domain of Boc that binds Shh abolishes this function, demonstrating that Shh binding through the FN3 domain is necessary for BOC's role in oligodendrocyte specification.","method":"Forward genetic screen, boc mutant allele (bocco25) characterization, Olig2 lineage analysis, in situ hybridization","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — forward genetic allele with domain-specific missense mutation establishing Shh-binding FN3 domain requirement, single lab","pmids":["34057474"],"is_preprint":false},{"year":2017,"finding":"BOC is a modifier gene for holoprosencephaly in humans. Missense BOC variants identified in HPE patients have either loss- or gain-of-function properties in cell-based SHH signaling assays, demonstrating that BOC variant alleles modulate SHH pathway activity and HPE penetrance.","method":"Cell-based SHH signaling assays with patient-derived BOC missense variants, human genetic analysis","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — cell-based assay showing functional consequence of patient variants, single lab, no in vivo validation","pmids":["28677295"],"is_preprint":false},{"year":2015,"finding":"Mice lacking BOC display age-related overweight and excess white adipose tissue. Boc-/- mouse embryo fibroblasts show enhanced adipogenesis in vitro with reduced HH pathway target gene expression, indicating BOC promotes HH signaling to inhibit adipogenesis.","method":"Boc knockout mice (body weight, adipose tissue analysis, high-fat diet challenge), Boc-/- MEF adipogenesis assay, HH target gene expression","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse phenotype with in vitro MEF adipogenesis rescue and HH target gene readout, single lab","pmids":["25576054"],"is_preprint":false},{"year":2005,"finding":"Zebrafish BOC functions as an axon-guidance molecule directing dorsoventrally projecting axon tracts in the embryonic brain. Morpholino-based loss-of-function of boc causes selective defects in ventrally projecting axons from the presumptive telencephalon.","method":"Antisense morpholino knockdown in zebrafish, axon tract analysis","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — morpholino KD with defined axon tract phenotype, single lab, morpholino-based approach","pmids":["15776441"],"is_preprint":false},{"year":2019,"finding":"A novel BOC-PLAG1 fusion gene was identified in lipoblastoma, in which the constitutively active promoter of BOC drives overexpression of PLAG1, leading to PLAG1 expression 35.7-fold higher than in normal adipocytes.","method":"5' RACE, sequence analysis, RT-PCR quantification of fusion transcript and PLAG1 expression","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single case identification of fusion gene by molecular sequencing, no functional mechanistic experiment on BOC protein itself","pmids":["30857637"],"is_preprint":false}],"current_model":"BOC is a transmembrane Ig/fibronectin superfamily co-receptor that binds Hedgehog ligands (Shh, Ihh, Dhh) through a specific fibronectin type III domain, forming complexes with Ptch1 and the co-receptors CDO and GAS1 to collectively and obligatorily promote HH pathway activation; it also mediates non-canonical Shh signaling in axon guidance by acting as a Shh-dependent endocytic platform—binding Numb to drive its own internalization into early endosomes, thereby enabling Ptch1 internalization and downstream signaling—and promotes neuronal differentiation and neurite outgrowth through ABL kinase interaction and JNK activation, while in ligand-producing cells participating in a Dispatched-BOC/CDON complex required for cytoneme-mediated Shh transport."},"narrative":{"mechanistic_narrative":"BOC is a cell-surface Ig/fibronectin-superfamily co-receptor that, together with the related co-receptors CDO and GAS1, is collectively and obligatorily required for Hedgehog (HH) pathway activation across multiple developmental tissues [PMID:21664577, PMID:21664576]. BOC binds all three mammalian Hedgehog ligands (Shh, Ihh, Dhh) directly through a specific fibronectin type III repeat, an interaction resolved at atomic resolution and shown to be essential for activity [PMID:16647304, PMID:20519495]; a missense mutation in this FN3 domain abolishes BOC's signaling function in vivo [PMID:34057474]. BOC forms distinct receptor complexes with Patched: a Ptch1/BOC complex signals through Gli induction, distinguishing it from the Ptch2/GAS1 complex that engages a parallel Creb/Src branch, so that the spatiotemporal balance of BOC versus GAS1 expression tunes signaling output [PMID:32332736]. BOC originally emerged as a partner of CDO in cis complexes that promote myogenic differentiation [PMID:11782431], and across contexts it acts as a context-dependent modulator that can either promote or restrain HH activity—driving cerebellar granule precursor proliferation and, when elevated, medulloblastoma progression via CyclinD1-dependent DNA damage [PMID:25263791], yet restraining HH output during craniofacial development [PMID:33060130]. In neurons, BOC functions as a Shh receptor in axon guidance, mediating both attractive turning of commissural axons and repulsion of ipsilateral retinal ganglion cell axons [PMID:17086203, PMID:20053908]; mechanistically it serves as a Shh-dependent endocytic platform, binding the adaptor Numb to drive its own internalization into early endosomes, which is in turn required for Ptch1 internalization and downstream signaling [PMID:31054872]. BOC additionally promotes neuronal differentiation and neurite outgrowth through ABL kinase binding and JNK activation [PMID:27871935]. In ligand-producing cells BOC participates in a Dispatched–BOC/CDON complex that supports cytoneme-mediated Shh transport [PMID:33570491]. Human BOC missense variants act as gain- or loss-of-function modifiers of holoprosencephaly by altering SHH pathway activity, consistent with mouse genetics identifying Boc as a silent HPE modifier of Cdo [PMID:21183473, PMID:28677295].","teleology":[{"year":2002,"claim":"Established BOC's first molecular partnership and cellular role by showing it acts with CDO to promote differentiation, defining BOC as a co-receptor rather than an autonomous signaling unit.","evidence":"Reciprocal Co-IP of ecto- and intracellular domains plus soluble-ectodomain and dominant-negative CDO assays in myoblasts","pmids":["11782431"],"confidence":"High","gaps":["Ligand not yet identified at this stage","Did not connect CDO/BOC complex to Hedgehog signaling"]},{"year":2006,"claim":"Identified Shh as the BOC ligand and mapped binding to a specific fibronectin repeat, converting BOC from a differentiation factor of unknown ligand into a defined Hedgehog co-receptor.","evidence":"Domain-mapping binding assays with neural tube ectopic expression and loss-of-function","pmids":["16647304"],"confidence":"High","gaps":["Did not resolve how BOC cooperates with Ptch1 at the receptor level","Cell-autonomous versus sequestration roles not fully separated"]},{"year":2006,"claim":"Demonstrated a signaling role distinct from canonical morphogen patterning by establishing BOC as a Shh receptor required for commissural axon guidance.","evidence":"RNAi knockdown, in vitro axon turning assay, and mouse Boc knockout with direct binding","pmids":["17086203"],"confidence":"High","gaps":["Intracellular signaling mechanism in axons unresolved","Relationship to canonical Gli pathway in guidance unknown"]},{"year":2010,"claim":"Extended BOC's axon-guidance role to repulsion and showed cell-type-specific responses, establishing that BOC expression dictates whether an axon is attracted or repelled by Shh.","evidence":"In vitro retraction assay with Boc knockout mice and ectopic expression in contralateral RGCs","pmids":["20053908"],"confidence":"High","gaps":["Molecular basis of attraction-versus-repulsion switch not defined","Downstream effectors in RGCs unidentified"]},{"year":2010,"claim":"Provided structural and biochemical proof that BOC binds all three mammalian Hedgehog ligands in a conserved manner, generalizing its co-receptor role beyond Shh.","evidence":"X-ray crystal structures of CDO/BOC-Hh complexes with biochemical binding assays","pmids":["20519495"],"confidence":"High","gaps":["Functional consequences of pH-dependent CDO-Hh weakening not tested for BOC","Stoichiometry within full Ptch1 receptor complex unresolved"]},{"year":2010,"claim":"Defined BOC as a context-dependent HPE modifier and revealed evolutionary divergence from Drosophila, showing mammalian BOC/CDO are not strictly required for all Hh response.","evidence":"Cdo;Boc double knockout mouse genetics with Shh target gene analysis","pmids":["21183473"],"confidence":"High","gaps":["Molecular basis of selective tissue requirement unclear","Human relevance not yet established at this stage"]},{"year":2010,"claim":"Drosophila orthologs Boi/Ihog illuminated upstream and ligand-handling roles—Smo accumulation, ligand sequestration, and cytoneme-associated distribution—providing mechanistic hypotheses for the vertebrate co-receptors.","evidence":"Clonal double-mutant analysis, FSC proliferation assays, and Hh localization/cytoneme imaging in fly tissues","pmids":["21098113","21044292","23276604"],"confidence":"Medium","gaps":["Direct extrapolation to mammalian BOC not demonstrated","Cytoneme role in vertebrates not yet shown at this stage"]},{"year":2011,"claim":"Established the obligatory collective requirement of BOC, CDON, and GAS1 for HH activation and showed each forms a distinct Ptch1 complex, defining the co-receptor tier as a non-redundant gate on pathway activity.","evidence":"Co-IP of Boc/Gas1 with Ptch1, triple knockout epistasis in CGNPs and neural tube, and a Ptch1-binding mutant Hh ligand","pmids":["21664577","21664576"],"confidence":"High","gaps":["How distinct complexes converge on Smo not resolved","Quantitative contribution of each co-receptor per tissue unclear"]},{"year":2014,"claim":"Linked BOC-driven Shh signaling to disease by showing it promotes granule precursor proliferation and accelerates medulloblastoma via CyclinD1-dependent DNA damage and Ptch1 LOH.","evidence":"Boc knockout and overexpression in GCPs with DNA damage, CyclinD1, and LOH analyses","pmids":["25263791"],"confidence":"Medium","gaps":["Causal chain from BOC to DNA damage not fully mechanistically dissected","Single lab; human tumor validation limited"]},{"year":2015,"claim":"Showed CDON and BOC promote HH signaling by distinct molecular mechanisms despite redundancy, revealing non-equivalent membrane-attachment and ectodomain requirements.","evidence":"In vivo domain deletion/mutation structure-function in chick neural tube","pmids":["25848697"],"confidence":"Medium","gaps":["Biochemical basis of mechanistic divergence unresolved","Single lab, gain-of-function context"]},{"year":2015,"claim":"Revealed a systemic metabolic role, with BOC promoting HH signaling to restrain adipogenesis and prevent age-related adiposity.","evidence":"Boc knockout mouse metabolic phenotyping and Boc-/- MEF adipogenesis assays with HH target readouts","pmids":["25576054"],"confidence":"Medium","gaps":["Tissue source of relevant HH signal not identified","Cell-autonomous versus systemic contribution unclear"]},{"year":2016,"claim":"Identified a non-canonical intracellular effector arm, with BOC binding ABL kinase and activating JNK to drive neuronal differentiation, separating its signaling from the Gli axis.","evidence":"Co-IP, ABL-binding-defective mutants, JNK assays, and rescue in Boc-/- progenitors and P19 cells","pmids":["27871935"],"confidence":"Medium","gaps":["Direct phosphorylation sites on BOC not mapped","Integration with canonical Gli signaling unresolved"]},{"year":2017,"claim":"Translated the modifier concept to humans by showing patient BOC variants act as gain- or loss-of-function alleles modulating SHH activity and HPE penetrance.","evidence":"Cell-based SHH signaling assays with patient-derived missense variants","pmids":["28677295"],"confidence":"Medium","gaps":["No in vivo validation of variant effects","Genotype-phenotype correlation in larger cohorts lacking"]},{"year":2019,"claim":"Defined the mechanism of BOC in axon guidance as a Shh-dependent endocytic platform, showing Numb-driven BOC internalization is required upstream of Ptch1 internalization and turning.","evidence":"Numb-Boc Co-IP, endocytosis and growth-cone turning assays, and in vivo commissural axon guidance","pmids":["31054872"],"confidence":"High","gaps":["Signaling events downstream of endosomal Ptch1 in guidance unclear","Whether this endocytic mechanism operates in canonical morphogen contexts unknown"]},{"year":2019,"claim":"Expanded BOC's developmental roles to oligodendrocyte/myelin biology, showing it is required for developmental myelination and myelin repair.","evidence":"Boc knockout mice with oligodendrocyte lineage markers, demyelination repair model, and microglial morphology analysis","pmids":["31048318"],"confidence":"Medium","gaps":["Whether BOC acts cell-autonomously in oligodendroglia versus via niche signaling unresolved","Mechanistic link to HH pathway in repair not dissected"]},{"year":2020,"claim":"Resolved how co-receptor identity diversifies HH output, showing Ptch1/BOC signals through Gli whereas Ptch2/GAS1 adds a Creb/Src branch, and that BOC can also restrain HH activity in craniofacial tissues.","evidence":"Co-IP of Ptch1/Boc and Ptch2/Gas1 complexes, knockout genetics in PGC migration and craniofacial development, and phosphoprotein analysis","pmids":["32332736","33060130"],"confidence":"Medium","gaps":["Molecular determinants selecting Ptch1 versus Ptch2 partnering unclear","Switch between promoting and restraining HH not mechanistically explained"]},{"year":2021,"claim":"Established BOC's role in the ligand-producing cell, as part of a Dispatched-BOC/CDON complex enabling Myo10-dependent cytoneme transport and rapid SHH deposition.","evidence":"DISP-BOC Co-IP, live-cell cytoneme imaging, Myo10 knockout mice, and rapid signaling assays","pmids":["33570491"],"confidence":"Medium","gaps":["How the same BOC molecule functions in both sending and receiving cells unresolved","Stoichiometry and assembly of the DISP-BOC/CDON complex undefined"]},{"year":2021,"claim":"Confirmed in a vertebrate that Shh binding via the FN3 domain is necessary for BOC function, tying a discrete structural element to oligodendrocyte fate specification.","evidence":"Forward-genetic boc missense allele in the FN3 domain with Olig2 lineage analysis in zebrafish","pmids":["34057474"],"confidence":"Medium","gaps":["Whether the same domain mediates non-canonical endocytic/ABL functions not tested","Downstream effectors in pMN maintenance unidentified"]},{"year":null,"claim":"How BOC's promoting versus restraining activity, its choice of Ptch1 versus Ptch2 partners, and its canonical (Gli) versus non-canonical (ABL/JNK, Numb-endocytic) outputs are selected within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking complex composition to signaling outcome","Structural basis for partner selection among Ptch1/Ptch2/CDON/DISP unknown","Mechanism switching BOC between attractive and repulsive guidance undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[2,16,7]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[1,4,7]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[2,3,15]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,5,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[15]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4,13]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[15]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,4,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,6,18,20]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,3,15]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[12,21]}],"complexes":["Ptch1/BOC receptor complex","BOC/CDO cis-complex","Dispatched-BOC/CDON co-receptor 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formation.","date":"2021","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/34355694","citation_count":15,"is_preprint":false},{"pmid":"35447911","id":"PMC_35447911","title":"5-O-(N-Boc-l-Alanine)-Renieramycin T Induces Cancer Stem Cell Apoptosis via Targeting Akt Signaling.","date":"2022","source":"Marine drugs","url":"https://pubmed.ncbi.nlm.nih.gov/35447911","citation_count":15,"is_preprint":false},{"pmid":"25576054","id":"PMC_25576054","title":"Overweight in mice and enhanced adipogenesis in vitro are associated with lack of the hedgehog coreceptor boc.","date":"2015","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/25576054","citation_count":15,"is_preprint":false},{"pmid":"32003299","id":"PMC_32003299","title":"Drug-interactive mPEG-b-PLA-Phe(Boc) micelles enhance the tolerance and anti-tumor efficacy of docetaxel.","date":"2020","source":"Drug delivery","url":"https://pubmed.ncbi.nlm.nih.gov/32003299","citation_count":15,"is_preprint":false},{"pmid":"1701321","id":"PMC_1701321","title":"Correlation between phospholipid breakdown, intracellular calcium mobilization and enzyme secretion in rat pancreatic acini treated with Boc-[Nle28, Nle31]-CCK-7 and JMV180, two cholecystokinin analogues.","date":"1990","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/1701321","citation_count":15,"is_preprint":false},{"pmid":"17205168","id":"PMC_17205168","title":"Mixed-sequence pyrrolidine-amide oligonucleotide mimics: Boc(Z) synthesis and DNA/RNA binding properties.","date":"2006","source":"Organic & biomolecular chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17205168","citation_count":14,"is_preprint":false},{"pmid":"7837233","id":"PMC_7837233","title":"CCK-A receptor selective antagonists derived from the CCK-A receptor selective tetrapeptide agonist Boc-Trp-Lys(Tac)-Asp-MePhe-NH2 (A-71623).","date":"1995","source":"Journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7837233","citation_count":14,"is_preprint":false},{"pmid":"33456769","id":"PMC_33456769","title":"Mild deprotection of the N-tert-butyloxycarbonyl (N-Boc) group using oxalyl chloride.","date":"2020","source":"RSC advances","url":"https://pubmed.ncbi.nlm.nih.gov/33456769","citation_count":14,"is_preprint":false},{"pmid":"23154411","id":"PMC_23154411","title":"The Drosophila WIF1 homolog Shifted maintains glypican-independent Hedgehog signaling and interacts with the Hedgehog co-receptors Ihog and Boi.","date":"2012","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/23154411","citation_count":13,"is_preprint":false},{"pmid":"36344442","id":"PMC_36344442","title":"Chemical Synthesis of Proteins with Base-Labile Posttranslational Modifications Enabled by a Boc-SPPS Based General Strategy Towards Peptide C-Terminal Salicylaldehyde Esters.","date":"2022","source":"Angewandte Chemie (International ed. in English)","url":"https://pubmed.ncbi.nlm.nih.gov/36344442","citation_count":13,"is_preprint":false},{"pmid":"26713104","id":"PMC_26713104","title":"Rapid Synthesis of Boc-2',6'-dimethyl-l-tyrosine and Derivatives and Incorporation into Opioid Peptidomimetics.","date":"2015","source":"ACS medicinal chemistry letters","url":"https://pubmed.ncbi.nlm.nih.gov/26713104","citation_count":13,"is_preprint":false},{"pmid":"21600982","id":"PMC_21600982","title":"Anti-thyroid cancer properties of a novel isoflavone derivative, 7-(O)-carboxymethyl daidzein conjugated to N-t-Boc-hexylenediamine in vitro and in vivo.","date":"2011","source":"The Journal of steroid biochemistry and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/21600982","citation_count":13,"is_preprint":false},{"pmid":"1579566","id":"PMC_1579566","title":"Helix packing of leucine-rich peptides: a parallel leucine ladder in the structure of Boc-Aib-Leu-Aib-Aib-Leu-Leu-Leu-Aib-Leu-Aib-OMe.","date":"1992","source":"Proteins","url":"https://pubmed.ncbi.nlm.nih.gov/1579566","citation_count":13,"is_preprint":false},{"pmid":"15959592","id":"PMC_15959592","title":"Dynamic kinetic resolution of N-Boc-2-lithiopyrrolidine.","date":"2005","source":"Chemical communications (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/15959592","citation_count":13,"is_preprint":false},{"pmid":"34203581","id":"PMC_34203581","title":"Differential Expression of BOC, SPOCK2, and GJD3 Is Associated with Brain Metastasis of ER-Negative Breast Cancers.","date":"2021","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/34203581","citation_count":12,"is_preprint":false},{"pmid":"12720294","id":"PMC_12720294","title":"Overexpression of the immunoglobulin superfamily members CDO and BOC enhances differentiation of the human rhabdomyosarcoma cell line RD.","date":"2003","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/12720294","citation_count":12,"is_preprint":false},{"pmid":"32152757","id":"PMC_32152757","title":"D-Peptide analogues of Boc-Phe-Leu-Phe-Leu-Phe-COOH induce neovascularization via endothelial N-formyl peptide receptor 3.","date":"2020","source":"Angiogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/32152757","citation_count":12,"is_preprint":false},{"pmid":"1375964","id":"PMC_1375964","title":"Development of potent and selective CCK-A receptor agonists from Boc-CCK-4: tetrapeptides containing Lys(N epsilon)-amide residues.","date":"1992","source":"Journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/1375964","citation_count":12,"is_preprint":false},{"pmid":"17941688","id":"PMC_17941688","title":"Incorporation of the hydrophobic probe N-t-BOC-L-tyrosine tert-butyl ester to red blood cell membranes to study peroxynitrite-dependent reactions.","date":"2007","source":"Chemical research in toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/17941688","citation_count":12,"is_preprint":false},{"pmid":"15280949","id":"PMC_15280949","title":"Highly enantioselective reaction of lithiated N-Boc-thiazolidine: a new chiral formyl anion equivalent.","date":"2004","source":"Organic & biomolecular chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15280949","citation_count":12,"is_preprint":false},{"pmid":"33710800","id":"PMC_33710800","title":"BOC-PLAG1, a new fusion gene of pleomorphic adenoma: Identified in a fine-needle aspirate by RNA next-generation sequencing.","date":"2021","source":"Diagnostic cytopathology","url":"https://pubmed.ncbi.nlm.nih.gov/33710800","citation_count":11,"is_preprint":false},{"pmid":"22445332","id":"PMC_22445332","title":"Sonic hedgehog, BOC, and synaptic development: new players for an old game.","date":"2012","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/22445332","citation_count":11,"is_preprint":false},{"pmid":"22799572","id":"PMC_22799572","title":"Growth inhibition of human thyroid carcinoma and goiter cells in vitro by the isoflavone derivative 7-(O)-carboxymethyl daidzein conjugated to N-t-boc-hexylenediamine.","date":"2012","source":"Thyroid : official journal of the American Thyroid Association","url":"https://pubmed.ncbi.nlm.nih.gov/22799572","citation_count":11,"is_preprint":false},{"pmid":"8906884","id":"PMC_8906884","title":"Helix termination and chain reversal: crystal and molecular structure of the alpha, beta-dehydrooctapeptide Boc-Val-DeltaPhe-Phe-Ala-Leu-Ala-DeltaPhe-Leu-OH.","date":"1996","source":"Journal of biomolecular structure & dynamics","url":"https://pubmed.ncbi.nlm.nih.gov/8906884","citation_count":11,"is_preprint":false},{"pmid":"12673890","id":"PMC_12673890","title":"Clinical and immunomodulatory effects of fun-boi, an herbal medicine, on collagen-induced arthritis in vivo.","date":"2003","source":"Clinical and experimental rheumatology","url":"https://pubmed.ncbi.nlm.nih.gov/12673890","citation_count":10,"is_preprint":false},{"pmid":"30487432","id":"PMC_30487432","title":"Characterization of a Carbonyl Reductase from Rhodococcus erythropolis WZ010 and Its Variant Y54F for Asymmetric Synthesis of (S)-N-Boc-3-Hydroxypiperidine.","date":"2018","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/30487432","citation_count":10,"is_preprint":false},{"pmid":"12493605","id":"PMC_12493605","title":"Effects of intrathecal administration of a cell permeant caspase inhibitor, boc-D-fluoromethylketone (BDFMK), on behavioral deficits following spinal cord ischemia: a dose-response analysis.","date":"2003","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/12493605","citation_count":10,"is_preprint":false},{"pmid":"18554537","id":"PMC_18554537","title":"Tyrosine nitration, dimerization, and hydroxylation by peroxynitrite in membranes as studied by the hydrophobic probe N-t-BOC-l-tyrosine tert-butyl ester.","date":"2008","source":"Methods in enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/18554537","citation_count":10,"is_preprint":false},{"pmid":"34057474","id":"PMC_34057474","title":"Zebrafish spinal cord oligodendrocyte formation requires boc function.","date":"2021","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34057474","citation_count":9,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46712,"output_tokens":5899,"usd":0.11431,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14553,"output_tokens":5613,"usd":0.106545,"stage2_stop_reason":"end_turn"},"total_usd":0.220855,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"BOC associates with CDO to form cis complexes via both their ectodomains and intracellular domains, and positively regulates myogenic differentiation. A soluble BOC ectodomain fusion protein promotes differentiation independently of the intracellular region, while a dominant-negative CDO inhibits BOC's pro-myogenic effects, indicating BOC acts through CDO.\",\n      \"method\": \"Co-immunoprecipitation, soluble ectodomain fusion protein assays, dominant-negative CDO inhibition, myoblast differentiation assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP of ecto- and intracellular domains, multiple orthogonal functional assays (soluble protein, dominant-negative), replicated finding\",\n      \"pmids\": [\"11782431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"BOC and CDO bind Sonic Hedgehog through a high-affinity interaction with a specific fibronectin repeat that is essential for activity. Ectopic expression of BOC promotes Shh-dependent, cell-autonomous ventral cell fates and non-cell-autonomous ventral expansion consistent with Shh sequestration.\",\n      \"method\": \"Binding assays (fibronectin repeat domain mapping), ectopic expression in neural tube, genetic loss-of-function\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-mapping binding assays combined with in vivo gain- and loss-of-function experiments, replicated across labs\",\n      \"pmids\": [\"16647304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"BOC binds specifically to Shh and functions as a receptor for Shh in commissural axon guidance. RNAi-mediated knockdown of Boc impairs the ability of commissural axons to turn toward an ectopic Shh source in vitro, and targeted disruption of Boc causes commissural axon misguidance in vivo.\",\n      \"method\": \"RNAi knockdown, in vitro axon turning assay, mouse genetic knockout, binding assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro turning assay with RNAi, in vivo knockout phenotype, direct binding shown, multiple orthogonal methods\",\n      \"pmids\": [\"17086203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"BOC is enriched in ipsilateral retinal ganglion cells (RGCs) and mediates Shh-dependent repulsion of ipsilateral RGC axons at the optic chiasm. Only Boc-positive RGC axons retract in response to Shh in vitro; Boc mutant RGCs lose this response. In vivo, Boc is required for normal segregation of ipsilateral axons, and ectopic Boc expression in contralateral RGCs prevents their crossing.\",\n      \"method\": \"In vitro axon retraction assay, Boc knockout mice, gain-of-function ectopic expression in contralateral RGCs\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro functional assay with loss-of-function validation, in vivo gain- and loss-of-function, multiple orthogonal methods\",\n      \"pmids\": [\"20053908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BOC and GAS1 each form distinct receptor complexes with Ptch1. In cerebellar granule neuron progenitors (CGNPs), Boc, Cdon, and Gas1 have an absolute collective requirement for Hh-dependent proliferation; CGNPs lacking all three molecules show complete loss of Hh-dependent proliferation. A mutated Hh ligand that binds Ptch1 but not Boc/Cdon/Gas1 cannot activate Hh signaling.\",\n      \"method\": \"Co-immunoprecipitation (Boc/Gas1 with Ptch1), triple genetic knockout in CGNPs, mutant Hh ligand assays, cell proliferation assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP demonstrating distinct complexes, triple KO epistasis, mutant ligand approach, two companion papers from independent labs\",\n      \"pmids\": [\"21664577\", \"21664576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GAS1, CDO, and BOC play overlapping and essential roles during Hedgehog-mediated ventral neural patterning, with an obligatory collective requirement for HH pathway activity in multiple tissues including early cell fate specification of neural progenitors and later motor neuron progenitor maintenance.\",\n      \"method\": \"Genetic loss-of-function (single, double, triple knockout mice), HH target gene expression analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple compound mutant combinations, multiple tissue contexts, two labs independently reporting\",\n      \"pmids\": [\"21664576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Boc modifies the holoprosencephaly (HPE) spectrum caused by Cdo loss. Cdo;Boc double mutants display lobar HPE with defects in Shh target gene expression in the forebrain, identifying Boc as a silent HPE modifier gene. Cdo and Boc have selective roles: double mutants do not phenocopy Shh-null mice, indicating evolutionary divergence from Drosophila where Ihog/Boi loss abolishes all Hh response.\",\n      \"method\": \"Double knockout mouse genetics, Shh target gene expression analysis\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with compound mutants and target gene readouts, single lab but multiple genotypes tested\",\n      \"pmids\": [\"21183473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"All three mammalian Hedgehog proteins (Sonic, Indian, Desert Hh) bind CDO and BOC in the same manner, as demonstrated by biochemical binding assays and X-ray crystal structures of Hh proteins complexed with active domains of CDO and BOC. CDO-Hh interactions are weakened at low pH.\",\n      \"method\": \"X-ray crystallography, biochemical binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures of CDO/BOC-Hh complexes with biochemical validation, single lab but multiple ligands and structural rigor\",\n      \"pmids\": [\"20519495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Drosophila Boi is expressed in apical cells of the ovary and suppresses follicle stem cell proliferation by binding to and sequestering Hedgehog on the apical cell surface, thereby inhibiting Hh diffusion to FSCs.\",\n      \"method\": \"Genetic loss-of-function, cell-specific expression analysis, FSC proliferation assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined FSC proliferation readout, mechanism of ligand sequestration inferred from cell-specific expression and KO, single lab\",\n      \"pmids\": [\"21098113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Drosophila Ihog and Boi are required for accumulation of Smoothened (Smo) in Hh-responsive cells, placing Ihog/Boi upstream of Smo in the Hh pathway. Cells mutant for both ihog and boi fail to activate Hh pathway responses and aberrantly sort out of the anterior wing compartment.\",\n      \"method\": \"Genetic loss-of-function (double mutant clonal analysis in eye and wing discs), Smo localization assay\",\n      \"journal\": \"Neural development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clonal double-mutant epistasis with Smo accumulation readout, single lab\",\n      \"pmids\": [\"21044292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Drosophila Boi (and Ihog) are required to prevent apical dispersion of Hedgehog and aid Hh recycling for basolateral release and long-range gradient formation. Boi and Ihog are components of cytoneme-associated protein complexes with Dally and Shifted/DmWif that regulate Hh distribution.\",\n      \"method\": \"Genetic loss-of-function in wing disc epithelium, Hh localization imaging, cytoneme analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with Hh localization readout and cytoneme imaging, single lab\",\n      \"pmids\": [\"23276604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Shh/Boc signaling is required for sustained generation of ipsilateral projecting retinal ganglion cells. In Boc-/- retinas, the number of Zic2-positive iRGCs is reduced and more Islet2/Shh-positive cRGCs are observed, indicating Boc expression is required to sustain Zic2 expression, likely by regulating levels of Shh signaling from neighboring cRGCs.\",\n      \"method\": \"Boc knockout mice, cell fate marker analysis, in vivo Shh/Boc gain-of-function injection experiments\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO phenotype with specific cell fate markers, gain-of-function rescue, single lab\",\n      \"pmids\": [\"23678105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"BOC associates with Ptch1 and promotes Shh signaling in cerebellar granule cell precursors to drive proliferation. Mechanistically, Boc through elevated Shh signaling promotes high levels of DNA damage mediated by CyclinD1, which increases the incidence of Ptch1 loss of heterozygosity and medulloblastoma progression.\",\n      \"method\": \"Boc knockout mice, Boc overexpression in GCPs, DNA damage assays, CyclinD1 pathway analysis, LOH analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO and overexpression with mechanistic pathway (CyclinD1-DNA damage-LOH) analysis, single lab\",\n      \"pmids\": [\"25263791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CDON and BOC use distinct molecular mechanisms to promote Hh signaling despite functional redundancy. Specifically, they have distinct membrane attachment requirements and distinct extracellular motifs required for HH-promoting activity.\",\n      \"method\": \"In vivo gain-of-function in developing chicken spinal cord, domain deletion/mutation analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo domain structure-function in chick neural tube, multiple domain mutants tested, single lab\",\n      \"pmids\": [\"25848697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"BOC interacts with ABL non-receptor tyrosine kinase through its putative SH2-binding domain, is phosphorylated in an ABL activity-dependent manner, and activates JNK to promote neuronal differentiation and neurite outgrowth. ABL-binding-defective BOC mutants fail to activate JNK or rescue differentiation. Shh treatment enhances JNK activation in a BOC-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, ABL-binding domain mutants, JNK activation assays, Boc-/- neural progenitor cells, P19 cell differentiation assays\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mutants and functional rescue in multiple cell types, single lab\",\n      \"pmids\": [\"27871935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Shh induces BOC internalization into early endosomes via the endocytic adaptor Numb, which binds to BOC. Numb is required for Boc internalization, Shh-mediated growth-cone turning in vitro, and commissural axon guidance in vivo. Shh binding to Boc is required for Ptch1 internalization and growth-cone turning; Shh binding to Ptch1 alone is insufficient. BOC thus acts as a Shh-dependent endocytic platform gating Ptch1 internalization and Shh signaling in axon guidance.\",\n      \"method\": \"Co-immunoprecipitation (Numb-Boc), endocytosis assays, growth-cone turning assay, Numb knockdown, Boc and Ptch1 internalization imaging\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vitro functional turning assay, in vivo commissural axon guidance, multiple orthogonal approaches establishing mechanism\",\n      \"pmids\": [\"31054872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BOC is required for developmental myelination and myelin repair. Boc mutant mice display transient decreases in oligodendroglial cell density, delayed myelination, lower myelin basic protein production in adults, and impaired OPC differentiation during repair. Mutant microglia/macrophages also show altered morphology transition in vivo.\",\n      \"method\": \"Boc knockout mice, oligodendrocyte lineage marker analysis, myelin repair assay (demyelination model), microglial morphology analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined oligodendroglial and myelin readouts, single lab\",\n      \"pmids\": [\"31048318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Ptch1/Boc and Ptch2/Gas1 form specific hetero-complexes that mediate Smo de-repression with different kinetics. Ptch1-mediated signaling through Boc proceeds through Gli induction, while Ptch2-mediated signaling induces phosphorylation of Creb and Src in parallel to Gli induction, identifying a Ptch2-specific signal pathway. Spatiotemporal expression of Boc versus Gas1 determines distinct HH signaling outcomes.\",\n      \"method\": \"Co-immunoprecipitation (Ptch1/Boc and Ptch2/Gas1 complexes), knockout mouse genetics, primordial germ cell migration assay, phosphoprotein analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for heterocomplex formation, genetic KO epistasis in PGC migration, phosphoprotein readout, single lab\",\n      \"pmids\": [\"32332736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BOC acts as a multi-functional regulator of HH signaling during craniofacial development, alternately promoting or restraining HH pathway activity in a tissue-specific fashion. Boc deletion results in facial widening correlating with increased HH target gene expression, and partially ameliorates craniofacial defects in Gas1 null mice.\",\n      \"method\": \"Single and compound (Gas1;Boc) knockout mice, HH target gene expression analysis, craniofacial morphometric analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — compound genetic KO with target gene readouts in multiple craniofacial structures, single lab\",\n      \"pmids\": [\"33060130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BOC functions in ligand-producing cells as part of a Dispatched (DISP)-BOC/CDON co-receptor complex that promotes cytoneme occurrence and facilitates vesicular SHH transport via Myosin 10 for signal activation. Cytoneme-mediated SHH deposition onto receiving cells induces rapid (within seconds) receptor-dependent signaling.\",\n      \"method\": \"Co-immunoprecipitation (DISP-BOC complex), live-cell imaging of cytonemes, Myo10 knockout mice, SHH vesicular transport assay, rapid signaling assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for novel complex, live imaging with genetic KO, rapid signaling readout; mechanistic link to cytoneme transport in single lab\",\n      \"pmids\": [\"33570491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Zebrafish boc is required to maintain pMN progenitors and thereby specify oligodendrocyte fate. A missense mutation in the Fibronectin type III (FN3) domain of Boc that binds Shh abolishes this function, demonstrating that Shh binding through the FN3 domain is necessary for BOC's role in oligodendrocyte specification.\",\n      \"method\": \"Forward genetic screen, boc mutant allele (bocco25) characterization, Olig2 lineage analysis, in situ hybridization\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — forward genetic allele with domain-specific missense mutation establishing Shh-binding FN3 domain requirement, single lab\",\n      \"pmids\": [\"34057474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BOC is a modifier gene for holoprosencephaly in humans. Missense BOC variants identified in HPE patients have either loss- or gain-of-function properties in cell-based SHH signaling assays, demonstrating that BOC variant alleles modulate SHH pathway activity and HPE penetrance.\",\n      \"method\": \"Cell-based SHH signaling assays with patient-derived BOC missense variants, human genetic analysis\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — cell-based assay showing functional consequence of patient variants, single lab, no in vivo validation\",\n      \"pmids\": [\"28677295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Mice lacking BOC display age-related overweight and excess white adipose tissue. Boc-/- mouse embryo fibroblasts show enhanced adipogenesis in vitro with reduced HH pathway target gene expression, indicating BOC promotes HH signaling to inhibit adipogenesis.\",\n      \"method\": \"Boc knockout mice (body weight, adipose tissue analysis, high-fat diet challenge), Boc-/- MEF adipogenesis assay, HH target gene expression\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse phenotype with in vitro MEF adipogenesis rescue and HH target gene readout, single lab\",\n      \"pmids\": [\"25576054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Zebrafish BOC functions as an axon-guidance molecule directing dorsoventrally projecting axon tracts in the embryonic brain. Morpholino-based loss-of-function of boc causes selective defects in ventrally projecting axons from the presumptive telencephalon.\",\n      \"method\": \"Antisense morpholino knockdown in zebrafish, axon tract analysis\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — morpholino KD with defined axon tract phenotype, single lab, morpholino-based approach\",\n      \"pmids\": [\"15776441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A novel BOC-PLAG1 fusion gene was identified in lipoblastoma, in which the constitutively active promoter of BOC drives overexpression of PLAG1, leading to PLAG1 expression 35.7-fold higher than in normal adipocytes.\",\n      \"method\": \"5' RACE, sequence analysis, RT-PCR quantification of fusion transcript and PLAG1 expression\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single case identification of fusion gene by molecular sequencing, no functional mechanistic experiment on BOC protein itself\",\n      \"pmids\": [\"30857637\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BOC is a transmembrane Ig/fibronectin superfamily co-receptor that binds Hedgehog ligands (Shh, Ihh, Dhh) through a specific fibronectin type III domain, forming complexes with Ptch1 and the co-receptors CDO and GAS1 to collectively and obligatorily promote HH pathway activation; it also mediates non-canonical Shh signaling in axon guidance by acting as a Shh-dependent endocytic platform—binding Numb to drive its own internalization into early endosomes, thereby enabling Ptch1 internalization and downstream signaling—and promotes neuronal differentiation and neurite outgrowth through ABL kinase interaction and JNK activation, while in ligand-producing cells participating in a Dispatched-BOC/CDON complex required for cytoneme-mediated Shh transport.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BOC is a cell-surface Ig/fibronectin-superfamily co-receptor that, together with the related co-receptors CDO and GAS1, is collectively and obligatorily required for Hedgehog (HH) pathway activation across multiple developmental tissues [#4, #5]. BOC binds all three mammalian Hedgehog ligands (Shh, Ihh, Dhh) directly through a specific fibronectin type III repeat, an interaction resolved at atomic resolution and shown to be essential for activity [#1, #7]; a missense mutation in this FN3 domain abolishes BOC's signaling function in vivo [#20]. BOC forms distinct receptor complexes with Patched: a Ptch1/BOC complex signals through Gli induction, distinguishing it from the Ptch2/GAS1 complex that engages a parallel Creb/Src branch, so that the spatiotemporal balance of BOC versus GAS1 expression tunes signaling output [#17]. BOC originally emerged as a partner of CDO in cis complexes that promote myogenic differentiation [#0], and across contexts it acts as a context-dependent modulator that can either promote or restrain HH activity—driving cerebellar granule precursor proliferation and, when elevated, medulloblastoma progression via CyclinD1-dependent DNA damage [#12], yet restraining HH output during craniofacial development [#18]. In neurons, BOC functions as a Shh receptor in axon guidance, mediating both attractive turning of commissural axons and repulsion of ipsilateral retinal ganglion cell axons [#2, #3]; mechanistically it serves as a Shh-dependent endocytic platform, binding the adaptor Numb to drive its own internalization into early endosomes, which is in turn required for Ptch1 internalization and downstream signaling [#15]. BOC additionally promotes neuronal differentiation and neurite outgrowth through ABL kinase binding and JNK activation [#14]. In ligand-producing cells BOC participates in a Dispatched–BOC/CDON complex that supports cytoneme-mediated Shh transport [#19]. Human BOC missense variants act as gain- or loss-of-function modifiers of holoprosencephaly by altering SHH pathway activity, consistent with mouse genetics identifying Boc as a silent HPE modifier of Cdo [#6, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established BOC's first molecular partnership and cellular role by showing it acts with CDO to promote differentiation, defining BOC as a co-receptor rather than an autonomous signaling unit.\",\n      \"evidence\": \"Reciprocal Co-IP of ecto- and intracellular domains plus soluble-ectodomain and dominant-negative CDO assays in myoblasts\",\n      \"pmids\": [\"11782431\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ligand not yet identified at this stage\", \"Did not connect CDO/BOC complex to Hedgehog signaling\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified Shh as the BOC ligand and mapped binding to a specific fibronectin repeat, converting BOC from a differentiation factor of unknown ligand into a defined Hedgehog co-receptor.\",\n      \"evidence\": \"Domain-mapping binding assays with neural tube ectopic expression and loss-of-function\",\n      \"pmids\": [\"16647304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how BOC cooperates with Ptch1 at the receptor level\", \"Cell-autonomous versus sequestration roles not fully separated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated a signaling role distinct from canonical morphogen patterning by establishing BOC as a Shh receptor required for commissural axon guidance.\",\n      \"evidence\": \"RNAi knockdown, in vitro axon turning assay, and mouse Boc knockout with direct binding\",\n      \"pmids\": [\"17086203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular signaling mechanism in axons unresolved\", \"Relationship to canonical Gli pathway in guidance unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended BOC's axon-guidance role to repulsion and showed cell-type-specific responses, establishing that BOC expression dictates whether an axon is attracted or repelled by Shh.\",\n      \"evidence\": \"In vitro retraction assay with Boc knockout mice and ectopic expression in contralateral RGCs\",\n      \"pmids\": [\"20053908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of attraction-versus-repulsion switch not defined\", \"Downstream effectors in RGCs unidentified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Provided structural and biochemical proof that BOC binds all three mammalian Hedgehog ligands in a conserved manner, generalizing its co-receptor role beyond Shh.\",\n      \"evidence\": \"X-ray crystal structures of CDO/BOC-Hh complexes with biochemical binding assays\",\n      \"pmids\": [\"20519495\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequences of pH-dependent CDO-Hh weakening not tested for BOC\", \"Stoichiometry within full Ptch1 receptor complex unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined BOC as a context-dependent HPE modifier and revealed evolutionary divergence from Drosophila, showing mammalian BOC/CDO are not strictly required for all Hh response.\",\n      \"evidence\": \"Cdo;Boc double knockout mouse genetics with Shh target gene analysis\",\n      \"pmids\": [\"21183473\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of selective tissue requirement unclear\", \"Human relevance not yet established at this stage\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Drosophila orthologs Boi/Ihog illuminated upstream and ligand-handling roles—Smo accumulation, ligand sequestration, and cytoneme-associated distribution—providing mechanistic hypotheses for the vertebrate co-receptors.\",\n      \"evidence\": \"Clonal double-mutant analysis, FSC proliferation assays, and Hh localization/cytoneme imaging in fly tissues\",\n      \"pmids\": [\"21098113\", \"21044292\", \"23276604\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct extrapolation to mammalian BOC not demonstrated\", \"Cytoneme role in vertebrates not yet shown at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established the obligatory collective requirement of BOC, CDON, and GAS1 for HH activation and showed each forms a distinct Ptch1 complex, defining the co-receptor tier as a non-redundant gate on pathway activity.\",\n      \"evidence\": \"Co-IP of Boc/Gas1 with Ptch1, triple knockout epistasis in CGNPs and neural tube, and a Ptch1-binding mutant Hh ligand\",\n      \"pmids\": [\"21664577\", \"21664576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How distinct complexes converge on Smo not resolved\", \"Quantitative contribution of each co-receptor per tissue unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked BOC-driven Shh signaling to disease by showing it promotes granule precursor proliferation and accelerates medulloblastoma via CyclinD1-dependent DNA damage and Ptch1 LOH.\",\n      \"evidence\": \"Boc knockout and overexpression in GCPs with DNA damage, CyclinD1, and LOH analyses\",\n      \"pmids\": [\"25263791\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from BOC to DNA damage not fully mechanistically dissected\", \"Single lab; human tumor validation limited\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed CDON and BOC promote HH signaling by distinct molecular mechanisms despite redundancy, revealing non-equivalent membrane-attachment and ectodomain requirements.\",\n      \"evidence\": \"In vivo domain deletion/mutation structure-function in chick neural tube\",\n      \"pmids\": [\"25848697\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biochemical basis of mechanistic divergence unresolved\", \"Single lab, gain-of-function context\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed a systemic metabolic role, with BOC promoting HH signaling to restrain adipogenesis and prevent age-related adiposity.\",\n      \"evidence\": \"Boc knockout mouse metabolic phenotyping and Boc-/- MEF adipogenesis assays with HH target readouts\",\n      \"pmids\": [\"25576054\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tissue source of relevant HH signal not identified\", \"Cell-autonomous versus systemic contribution unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified a non-canonical intracellular effector arm, with BOC binding ABL kinase and activating JNK to drive neuronal differentiation, separating its signaling from the Gli axis.\",\n      \"evidence\": \"Co-IP, ABL-binding-defective mutants, JNK assays, and rescue in Boc-/- progenitors and P19 cells\",\n      \"pmids\": [\"27871935\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct phosphorylation sites on BOC not mapped\", \"Integration with canonical Gli signaling unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Translated the modifier concept to humans by showing patient BOC variants act as gain- or loss-of-function alleles modulating SHH activity and HPE penetrance.\",\n      \"evidence\": \"Cell-based SHH signaling assays with patient-derived missense variants\",\n      \"pmids\": [\"28677295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vivo validation of variant effects\", \"Genotype-phenotype correlation in larger cohorts lacking\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined the mechanism of BOC in axon guidance as a Shh-dependent endocytic platform, showing Numb-driven BOC internalization is required upstream of Ptch1 internalization and turning.\",\n      \"evidence\": \"Numb-Boc Co-IP, endocytosis and growth-cone turning assays, and in vivo commissural axon guidance\",\n      \"pmids\": [\"31054872\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling events downstream of endosomal Ptch1 in guidance unclear\", \"Whether this endocytic mechanism operates in canonical morphogen contexts unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded BOC's developmental roles to oligodendrocyte/myelin biology, showing it is required for developmental myelination and myelin repair.\",\n      \"evidence\": \"Boc knockout mice with oligodendrocyte lineage markers, demyelination repair model, and microglial morphology analysis\",\n      \"pmids\": [\"31048318\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether BOC acts cell-autonomously in oligodendroglia versus via niche signaling unresolved\", \"Mechanistic link to HH pathway in repair not dissected\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved how co-receptor identity diversifies HH output, showing Ptch1/BOC signals through Gli whereas Ptch2/GAS1 adds a Creb/Src branch, and that BOC can also restrain HH activity in craniofacial tissues.\",\n      \"evidence\": \"Co-IP of Ptch1/Boc and Ptch2/Gas1 complexes, knockout genetics in PGC migration and craniofacial development, and phosphoprotein analysis\",\n      \"pmids\": [\"32332736\", \"33060130\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular determinants selecting Ptch1 versus Ptch2 partnering unclear\", \"Switch between promoting and restraining HH not mechanistically explained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established BOC's role in the ligand-producing cell, as part of a Dispatched-BOC/CDON complex enabling Myo10-dependent cytoneme transport and rapid SHH deposition.\",\n      \"evidence\": \"DISP-BOC Co-IP, live-cell cytoneme imaging, Myo10 knockout mice, and rapid signaling assays\",\n      \"pmids\": [\"33570491\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How the same BOC molecule functions in both sending and receiving cells unresolved\", \"Stoichiometry and assembly of the DISP-BOC/CDON complex undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Confirmed in a vertebrate that Shh binding via the FN3 domain is necessary for BOC function, tying a discrete structural element to oligodendrocyte fate specification.\",\n      \"evidence\": \"Forward-genetic boc missense allele in the FN3 domain with Olig2 lineage analysis in zebrafish\",\n      \"pmids\": [\"34057474\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the same domain mediates non-canonical endocytic/ABL functions not tested\", \"Downstream effectors in pMN maintenance unidentified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How BOC's promoting versus restraining activity, its choice of Ptch1 versus Ptch2 partners, and its canonical (Gli) versus non-canonical (ABL/JNK, Numb-endocytic) outputs are selected within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking complex composition to signaling outcome\", \"Structural basis for partner selection among Ptch1/Ptch2/CDON/DISP unknown\", \"Mechanism switching BOC between attractive and repulsive guidance undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [2, 16, 7]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [1, 4, 7]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [2, 3, 15]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 5, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 13]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 4, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 6, 18, 20]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 3, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [12, 21]}\n    ],\n    \"complexes\": [\n      \"Ptch1/BOC receptor complex\",\n      \"BOC/CDO cis-complex\",\n      \"Dispatched-BOC/CDON co-receptor complex\"\n    ],\n    \"partners\": [\n      \"CDO\",\n      \"PTCH1\",\n      \"GAS1\",\n      \"SHH\",\n      \"NUMB\",\n      \"ABL\",\n      \"DISP\",\n      \"PTCH2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}