{"gene":"CHRDL1","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2012,"finding":"Loss-of-function mutations in CHRDL1 (encoding ventroptin, a BMP antagonist) cause X-linked megalocornea (MGC1), establishing that CHRDL1 is required for normal anterior segment development; CHRDL1 is expressed in the developing human cornea, anterior segment, retina, and fetal brain.","method":"Copy-number variation analysis, frameshift/missense/splice-site/nonsense mutation identification in seven MGC1 families; electrophysiological evaluation; expression studies in human fetal tissue","journal":"American Journal of Human Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple mutation classes in seven independent families, expression directly demonstrated in affected tissue, functional consequence (anterior segment dysgenesis) directly linked to CHRDL1 loss","pmids":["22284829"],"is_preprint":false},{"year":2015,"finding":"CHRDL1 (chrdl1) knockdown in Xenopus laevis reproduces the human X-linked megalocornea phenotype; chrdl1 loss leads to downregulation of bmp4 in the eye and altered phospho-SMAD1/5 signaling and reduced BMP receptor 1A in patients, indicating that CHRDL1 normally antagonizes BMP signaling in the anterior eye and its absence triggers negative-feedback reduction of BMP4.","method":"Morpholino knockdown in Xenopus laevis (in vivo XMC model); immunostaining for phospho-SMAD1/5 and BMPR1A in patient tissue; RT-qPCR for bmp4 expression","journal":"Human Molecular Genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function model with specific phenotypic readout, combined with patient tissue analysis using two orthogonal methods (signaling readouts + receptor expression)","pmids":["25712132"],"is_preprint":false},{"year":2017,"finding":"CHRDL1 knockdown in gastric cancer cells promotes tumor cell proliferation and migration through BMPR II by activating Akt, Erk, and β-catenin signaling; hypermethylation of the CHRDL1 promoter silences its expression and reduces secretion in gastric cancer; CHRDL1 overexpression suppresses tumor growth and metastasis in vivo.","method":"shRNA knockdown; Western blot for Akt, Erk, β-catenin phosphorylation; BMPR II pathway rescue experiments; bisulfite sequencing for promoter methylation; xenograft in vivo experiments","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and OE with defined signaling readouts, pathway placement via rescue experiments, in vivo confirmation; single lab","pmids":["28423564"],"is_preprint":false},{"year":2022,"finding":"CHRDL1 depletion in glioma stem-like cells (GSCs) reduces functional and molecular stemness traits and enhances radiation sensitivity, establishing CHRDL1 as an enforcer of stemness in GSCs by antagonizing BMP4-induced differentiation.","method":"Stable shRNA-mediated CHRDL1 knockdown in two GSC spheroid cultures; MTT assay, limiting dilution assay, sphere formation assay; Western blot; irradiation survival assays; qRT-PCR","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with multiple orthogonal functional readouts (stemness markers, radiation sensitivity, sphere formation); single lab","pmids":["36497175"],"is_preprint":false},{"year":2024,"finding":"CHRDL1 inhibits colorectal cancer cell migration, invasion, and angiogenesis by downregulating TGF-β/VEGF signaling; Western blot and rescue experiments placed CHRDL1 upstream of TGF-β pathway in the suppression of EMT and angiogenesis.","method":"Transwell and tube formation assays; Western blot; rescue experiments; in vivo tail-vein metastasis model","journal":"Molecular Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo experiments with pathway placement via rescue; single lab","pmids":["38415870"],"is_preprint":false},{"year":2024,"finding":"CHRDL1 suppresses OSCC invasion and metastasis by inhibiting MED29 expression through suppression of the MAPK signaling pathway, thereby blocking EMT.","method":"RT-qPCR; Western blot; scratch assay; Transwell assay; immunofluorescence; tail-vein lung metastasis model in nude mice","journal":"Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD/OE experiments with defined pathway (MAPK/MED29/EMT), in vivo validation; single lab","pmids":["39462350"],"is_preprint":false},{"year":2020,"finding":"miR-532-3p promotes proliferation and migration of amniotic fluid-derived mesenchymal stromal cells by targeting the 3' UTR of Chrdl1 and downregulating its expression; Chrdl1 itself suppresses AFMSC proliferation and migration.","method":"Dual-luciferase reporter assay for miR-532-3p targeting Chrdl1 3'-UTR; Chrdl1 overexpression and knockdown functional assays","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR targeting confirmed by luciferase assay, functional consequence validated by KD/OE; single lab","pmids":["32446365"],"is_preprint":false},{"year":2020,"finding":"miR-200b-3p targets the 3'-UTR of Chrdl1 and downregulates its expression in MC3T3-E1 osteoblasts; loss of Chrdl1 partially reverses the anti-apoptotic effect of Lycium barbarum polysaccharide in palmitic acid-treated cells, implicating Chrdl1 in a miR-200b-3p/Chrdl1/PPARγ axis regulating osteoblast apoptosis.","method":"Luciferase reporter gene assay; RT-PCR; Western blot; flow cytometry for apoptosis; CCK-8 viability assay","journal":"Food & Nutrition Research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — luciferase assay for target validation, functional rescue; single lab, pathway placement is partial","pmids":["33447177"],"is_preprint":false},{"year":2014,"finding":"Additional novel CHRDL1 mutations in ten families confirm CHRDL1 as the causal gene for X-linked megalocornea (MGC1); a CHRDL1 missense mutation in a Neuhäuser syndrome patient accounts for the MGC1 phenotype, suggesting the syndrome may be di- or multigenic; MGC1 patients have reduced central corneal thickness.","method":"Targeted sequencing and whole exome sequencing; clinical ultrasonography","journal":"PLoS One","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutation identification in 10 independent families with direct genotype-phenotype correlation; independent replication of MGC1 causation","pmids":["25093588"],"is_preprint":false}],"current_model":"CHRDL1 encodes ventroptin, a secreted BMP antagonist that is essential for anterior segment (corneal) development—loss-of-function mutations cause X-linked megalocornea by impairing BMP antagonism, leading to reduced BMP4 signaling and altered SMAD1/5 phosphorylation—and in cancer contexts acts as a tumor suppressor that dampens BMP/BMPR II, TGF-β/VEGF, and MAPK signaling to restrain proliferation, EMT, angiogenesis, and stemness."},"narrative":{"mechanistic_narrative":"CHRDL1 encodes ventroptin, a secreted BMP antagonist required for normal anterior segment development of the eye [PMID:22284829]. Loss-of-function mutations across multiple classes cause X-linked megalocornea (MGC1), a connection established in seven families and independently replicated in ten additional families [PMID:22284829, PMID:25093588]. Mechanistically, CHRDL1 antagonizes BMP signaling in the anterior eye: its loss in a Xenopus knockdown model reproduces the megalocornea phenotype and triggers downregulation of bmp4, altered phospho-SMAD1/5 signaling, and reduced BMP receptor 1A in patient tissue, consistent with negative-feedback dysregulation when antagonism is lost [PMID:25712132]. Beyond ocular development, CHRDL1 acts as a tumor suppressor across several cancers, restraining proliferation, migration, EMT, angiogenesis, and stemness. In gastric cancer it is silenced by promoter hypermethylation, and its loss promotes proliferation and migration through BMPR II with activation of Akt, Erk, and β-catenin signaling [PMID:28423564]; in glioma stem-like cells it enforces stemness and radioresistance by antagonizing BMP4-induced differentiation [PMID:36497175]; in colorectal cancer it suppresses invasion and angiogenesis by downregulating TGF-β/VEGF signaling [PMID:38415870]; and in oral squamous cell carcinoma it blocks EMT by suppressing MAPK signaling and MED29 expression [PMID:39462350]. CHRDL1 expression is itself controlled post-transcriptionally by microRNAs targeting its 3'-UTR, including miR-532-3p in mesenchymal stromal cells [PMID:32446365].","teleology":[{"year":2012,"claim":"Established CHRDL1 as the causal gene for X-linked megalocornea, defining a developmental requirement for this BMP antagonist in the anterior eye where its function had been unknown.","evidence":"Identification of multiple mutation classes across seven MGC1 families plus expression analysis in human fetal cornea, anterior segment, retina, and brain","pmids":["22284829"],"confidence":"High","gaps":["Did not demonstrate the molecular signaling consequence of CHRDL1 loss","Did not establish direct BMP-binding biochemistry"]},{"year":2014,"claim":"Replicated and extended the MGC1 genotype-phenotype link, confirming causation and connecting CHRDL1 to a broader syndromic context.","evidence":"Targeted and whole-exome sequencing in ten additional families with clinical ultrasonography","pmids":["25093588"],"confidence":"Medium","gaps":["Did not resolve whether Neuhäuser syndrome is di-/multigenic","No mechanistic readout of mutation consequences"]},{"year":2015,"claim":"Provided the mechanistic basis for MGC1 by showing CHRDL1 normally antagonizes BMP signaling in the anterior eye, with loss causing feedback dysregulation.","evidence":"Morpholino knockdown in Xenopus laevis recapitulating the phenotype, plus phospho-SMAD1/5 and BMPR1A immunostaining and bmp4 RT-qPCR in patient tissue","pmids":["25712132"],"confidence":"High","gaps":["Direct BMP4-CHRDL1 binding not biochemically reconstituted","Mechanism linking reduced antagonism to corneal overgrowth not fully resolved"]},{"year":2017,"claim":"Extended CHRDL1 function to cancer, establishing it as an epigenetically silenced tumor suppressor acting through BMPR II.","evidence":"shRNA knockdown and overexpression in gastric cancer cells, BMPR II rescue, bisulfite sequencing, and xenograft assays","pmids":["28423564"],"confidence":"Medium","gaps":["Single lab","Direct interaction of CHRDL1 with BMPR II not shown"]},{"year":2020,"claim":"Identified post-transcriptional control of CHRDL1 by microRNAs, explaining how its anti-proliferative output is downregulated.","evidence":"Dual-luciferase 3'-UTR reporter assays for miR-532-3p (and miR-200b-3p) with knockdown/overexpression functional readouts","pmids":["32446365","33447177"],"confidence":"Medium","gaps":["miR-200b-3p/PPARγ axis only partially placed (Low confidence)","Physiological relevance of these miRNA axes in vivo unestablished"]},{"year":2022,"claim":"Showed CHRDL1 enforces cancer stemness by antagonizing BMP4-induced differentiation, linking its developmental BMP-antagonist role to tumor biology.","evidence":"Stable shRNA knockdown in two glioma stem-like cell cultures with stemness, sphere formation, and irradiation survival assays","pmids":["36497175"],"confidence":"Medium","gaps":["Single lab","Direct BMP4 antagonism in GSCs not biochemically demonstrated"]},{"year":2024,"claim":"Broadened the tumor-suppressor mechanism beyond BMP to TGF-β/VEGF and MAPK axes controlling EMT and angiogenesis.","evidence":"Knockdown/overexpression with rescue, Western blot, transwell/tube formation assays, and tail-vein metastasis models in colorectal cancer and OSCC","pmids":["38415870","39462350"],"confidence":"Medium","gaps":["Single lab per study","How a BMP antagonist intersects TGF-β/VEGF and MAPK/MED29 not mechanistically unified"]},{"year":null,"claim":"How CHRDL1 directly engages BMP ligands or receptors at the biochemical level, and whether its diverse cancer-pathway effects converge on a single secreted-antagonist mechanism, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No reconstituted CHRDL1-BMP binding biochemistry in the corpus","No structural model","Unclear whether TGF-β/VEGF/MAPK effects are direct or downstream of BMP antagonism"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,2]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,4,5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,2,4,5]}],"complexes":[],"partners":["BMP4","BMPR2","BMPR1A"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BU40","full_name":"Chordin-like protein 1","aliases":["Neuralin-1","Neurogenesin-1","Ventroptin"],"length_aa":456,"mass_kda":52.0,"function":"Antagonizes the function of BMP4 by binding to it and preventing its interaction with receptors. Alters the fate commitment of neural stem cells from gliogenesis to neurogenesis. Contributes to neuronal differentiation of neural stem cells in the brain by preventing the adoption of a glial fate. May play a crucial role in dorsoventral axis formation. May play a role in embryonic bone formation (By similarity). May also play an important role in regulating retinal angiogenesis through modulation of BMP4 actions in endothelial cells. Plays a role during anterior segment eye development","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/Q9BU40/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CHRDL1","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/CHRDL1","total_profiled":1310},"omim":[{"mim_id":"309300","title":"MEGALOCORNEA; MGC1","url":"https://www.omim.org/entry/309300"},{"mim_id":"300350","title":"CHORDIN-LIKE 1; CHRDL1","url":"https://www.omim.org/entry/300350"},{"mim_id":"249310","title":"NEUHAUSER SYNDROME","url":"https://www.omim.org/entry/249310"},{"mim_id":"231300","title":"GLAUCOMA 3, PRIMARY CONGENITAL, A; GLC3A","url":"https://www.omim.org/entry/231300"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose tissue","ntpm":176.6},{"tissue":"seminal vesicle","ntpm":211.4}],"url":"https://www.proteinatlas.org/search/CHRDL1"},"hgnc":{"alias_symbol":["NRLN1","CHL"],"prev_symbol":["MGC1"]},"alphafold":{"accession":"Q9BU40","domains":[{"cath_id":"2.10.70","chopping":"35-76","consensus_level":"high","plddt":81.8417,"start":35,"end":76},{"cath_id":"2.20.140","chopping":"345-445","consensus_level":"high","plddt":88.8224,"start":345,"end":445}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BU40","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BU40-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BU40-F1-predicted_aligned_error_v6.png","plddt_mean":69.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CHRDL1","jax_strain_url":"https://www.jax.org/strain/search?query=CHRDL1"},"sequence":{"accession":"Q9BU40","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BU40.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BU40/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BU40"}},"corpus_meta":[{"pmid":"2265610","id":"PMC_2265610","title":"The 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CHRDL1 is expressed in the developing human cornea, anterior segment, retina, and fetal brain.\",\n      \"method\": \"Copy-number variation analysis, frameshift/missense/splice-site/nonsense mutation identification in seven MGC1 families; electrophysiological evaluation; expression studies in human fetal tissue\",\n      \"journal\": \"American Journal of Human Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple mutation classes in seven independent families, expression directly demonstrated in affected tissue, functional consequence (anterior segment dysgenesis) directly linked to CHRDL1 loss\",\n      \"pmids\": [\"22284829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CHRDL1 (chrdl1) knockdown in Xenopus laevis reproduces the human X-linked megalocornea phenotype; chrdl1 loss leads to downregulation of bmp4 in the eye and altered phospho-SMAD1/5 signaling and reduced BMP receptor 1A in patients, indicating that CHRDL1 normally antagonizes BMP signaling in the anterior eye and its absence triggers negative-feedback reduction of BMP4.\",\n      \"method\": \"Morpholino knockdown in Xenopus laevis (in vivo XMC model); immunostaining for phospho-SMAD1/5 and BMPR1A in patient tissue; RT-qPCR for bmp4 expression\",\n      \"journal\": \"Human Molecular Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function model with specific phenotypic readout, combined with patient tissue analysis using two orthogonal methods (signaling readouts + receptor expression)\",\n      \"pmids\": [\"25712132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CHRDL1 knockdown in gastric cancer cells promotes tumor cell proliferation and migration through BMPR II by activating Akt, Erk, and β-catenin signaling; hypermethylation of the CHRDL1 promoter silences its expression and reduces secretion in gastric cancer; CHRDL1 overexpression suppresses tumor growth and metastasis in vivo.\",\n      \"method\": \"shRNA knockdown; Western blot for Akt, Erk, β-catenin phosphorylation; BMPR II pathway rescue experiments; bisulfite sequencing for promoter methylation; xenograft in vivo experiments\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and OE with defined signaling readouts, pathway placement via rescue experiments, in vivo confirmation; single lab\",\n      \"pmids\": [\"28423564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHRDL1 depletion in glioma stem-like cells (GSCs) reduces functional and molecular stemness traits and enhances radiation sensitivity, establishing CHRDL1 as an enforcer of stemness in GSCs by antagonizing BMP4-induced differentiation.\",\n      \"method\": \"Stable shRNA-mediated CHRDL1 knockdown in two GSC spheroid cultures; MTT assay, limiting dilution assay, sphere formation assay; Western blot; irradiation survival assays; qRT-PCR\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with multiple orthogonal functional readouts (stemness markers, radiation sensitivity, sphere formation); single lab\",\n      \"pmids\": [\"36497175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CHRDL1 inhibits colorectal cancer cell migration, invasion, and angiogenesis by downregulating TGF-β/VEGF signaling; Western blot and rescue experiments placed CHRDL1 upstream of TGF-β pathway in the suppression of EMT and angiogenesis.\",\n      \"method\": \"Transwell and tube formation assays; Western blot; rescue experiments; in vivo tail-vein metastasis model\",\n      \"journal\": \"Molecular Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo experiments with pathway placement via rescue; single lab\",\n      \"pmids\": [\"38415870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CHRDL1 suppresses OSCC invasion and metastasis by inhibiting MED29 expression through suppression of the MAPK signaling pathway, thereby blocking EMT.\",\n      \"method\": \"RT-qPCR; Western blot; scratch assay; Transwell assay; immunofluorescence; tail-vein lung metastasis model in nude mice\",\n      \"journal\": \"Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD/OE experiments with defined pathway (MAPK/MED29/EMT), in vivo validation; single lab\",\n      \"pmids\": [\"39462350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-532-3p promotes proliferation and migration of amniotic fluid-derived mesenchymal stromal cells by targeting the 3' UTR of Chrdl1 and downregulating its expression; Chrdl1 itself suppresses AFMSC proliferation and migration.\",\n      \"method\": \"Dual-luciferase reporter assay for miR-532-3p targeting Chrdl1 3'-UTR; Chrdl1 overexpression and knockdown functional assays\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR targeting confirmed by luciferase assay, functional consequence validated by KD/OE; single lab\",\n      \"pmids\": [\"32446365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-200b-3p targets the 3'-UTR of Chrdl1 and downregulates its expression in MC3T3-E1 osteoblasts; loss of Chrdl1 partially reverses the anti-apoptotic effect of Lycium barbarum polysaccharide in palmitic acid-treated cells, implicating Chrdl1 in a miR-200b-3p/Chrdl1/PPARγ axis regulating osteoblast apoptosis.\",\n      \"method\": \"Luciferase reporter gene assay; RT-PCR; Western blot; flow cytometry for apoptosis; CCK-8 viability assay\",\n      \"journal\": \"Food & Nutrition Research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — luciferase assay for target validation, functional rescue; single lab, pathway placement is partial\",\n      \"pmids\": [\"33447177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Additional novel CHRDL1 mutations in ten families confirm CHRDL1 as the causal gene for X-linked megalocornea (MGC1); a CHRDL1 missense mutation in a Neuhäuser syndrome patient accounts for the MGC1 phenotype, suggesting the syndrome may be di- or multigenic; MGC1 patients have reduced central corneal thickness.\",\n      \"method\": \"Targeted sequencing and whole exome sequencing; clinical ultrasonography\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutation identification in 10 independent families with direct genotype-phenotype correlation; independent replication of MGC1 causation\",\n      \"pmids\": [\"25093588\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CHRDL1 encodes ventroptin, a secreted BMP antagonist that is essential for anterior segment (corneal) development—loss-of-function mutations cause X-linked megalocornea by impairing BMP antagonism, leading to reduced BMP4 signaling and altered SMAD1/5 phosphorylation—and in cancer contexts acts as a tumor suppressor that dampens BMP/BMPR II, TGF-β/VEGF, and MAPK signaling to restrain proliferation, EMT, angiogenesis, and stemness.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CHRDL1 encodes ventroptin, a secreted BMP antagonist required for normal anterior segment development of the eye [#0]. Loss-of-function mutations across multiple classes cause X-linked megalocornea (MGC1), a connection established in seven families and independently replicated in ten additional families [#0, #8]. Mechanistically, CHRDL1 antagonizes BMP signaling in the anterior eye: its loss in a Xenopus knockdown model reproduces the megalocornea phenotype and triggers downregulation of bmp4, altered phospho-SMAD1/5 signaling, and reduced BMP receptor 1A in patient tissue, consistent with negative-feedback dysregulation when antagonism is lost [#1]. Beyond ocular development, CHRDL1 acts as a tumor suppressor across several cancers, restraining proliferation, migration, EMT, angiogenesis, and stemness. In gastric cancer it is silenced by promoter hypermethylation, and its loss promotes proliferation and migration through BMPR II with activation of Akt, Erk, and \\u03b2-catenin signaling [#2]; in glioma stem-like cells it enforces stemness and radioresistance by antagonizing BMP4-induced differentiation [#3]; in colorectal cancer it suppresses invasion and angiogenesis by downregulating TGF-\\u03b2/VEGF signaling [#4]; and in oral squamous cell carcinoma it blocks EMT by suppressing MAPK signaling and MED29 expression [#5]. CHRDL1 expression is itself controlled post-transcriptionally by microRNAs targeting its 3'-UTR, including miR-532-3p in mesenchymal stromal cells [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established CHRDL1 as the causal gene for X-linked megalocornea, defining a developmental requirement for this BMP antagonist in the anterior eye where its function had been unknown.\",\n      \"evidence\": \"Identification of multiple mutation classes across seven MGC1 families plus expression analysis in human fetal cornea, anterior segment, retina, and brain\",\n      \"pmids\": [\"22284829\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not demonstrate the molecular signaling consequence of CHRDL1 loss\", \"Did not establish direct BMP-binding biochemistry\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Replicated and extended the MGC1 genotype-phenotype link, confirming causation and connecting CHRDL1 to a broader syndromic context.\",\n      \"evidence\": \"Targeted and whole-exome sequencing in ten additional families with clinical ultrasonography\",\n      \"pmids\": [\"25093588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not resolve whether Neuh\\u00e4user syndrome is di-/multigenic\", \"No mechanistic readout of mutation consequences\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided the mechanistic basis for MGC1 by showing CHRDL1 normally antagonizes BMP signaling in the anterior eye, with loss causing feedback dysregulation.\",\n      \"evidence\": \"Morpholino knockdown in Xenopus laevis recapitulating the phenotype, plus phospho-SMAD1/5 and BMPR1A immunostaining and bmp4 RT-qPCR in patient tissue\",\n      \"pmids\": [\"25712132\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct BMP4-CHRDL1 binding not biochemically reconstituted\", \"Mechanism linking reduced antagonism to corneal overgrowth not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended CHRDL1 function to cancer, establishing it as an epigenetically silenced tumor suppressor acting through BMPR II.\",\n      \"evidence\": \"shRNA knockdown and overexpression in gastric cancer cells, BMPR II rescue, bisulfite sequencing, and xenograft assays\",\n      \"pmids\": [\"28423564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct interaction of CHRDL1 with BMPR II not shown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified post-transcriptional control of CHRDL1 by microRNAs, explaining how its anti-proliferative output is downregulated.\",\n      \"evidence\": \"Dual-luciferase 3'-UTR reporter assays for miR-532-3p (and miR-200b-3p) with knockdown/overexpression functional readouts\",\n      \"pmids\": [\"32446365\", \"33447177\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"miR-200b-3p/PPAR\\u03b3 axis only partially placed (Low confidence)\", \"Physiological relevance of these miRNA axes in vivo unestablished\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed CHRDL1 enforces cancer stemness by antagonizing BMP4-induced differentiation, linking its developmental BMP-antagonist role to tumor biology.\",\n      \"evidence\": \"Stable shRNA knockdown in two glioma stem-like cell cultures with stemness, sphere formation, and irradiation survival assays\",\n      \"pmids\": [\"36497175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct BMP4 antagonism in GSCs not biochemically demonstrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Broadened the tumor-suppressor mechanism beyond BMP to TGF-\\u03b2/VEGF and MAPK axes controlling EMT and angiogenesis.\",\n      \"evidence\": \"Knockdown/overexpression with rescue, Western blot, transwell/tube formation assays, and tail-vein metastasis models in colorectal cancer and OSCC\",\n      \"pmids\": [\"38415870\", \"39462350\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab per study\", \"How a BMP antagonist intersects TGF-\\u03b2/VEGF and MAPK/MED29 not mechanistically unified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CHRDL1 directly engages BMP ligands or receptors at the biochemical level, and whether its diverse cancer-pathway effects converge on a single secreted-antagonist mechanism, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reconstituted CHRDL1-BMP binding biochemistry in the corpus\", \"No structural model\", \"Unclear whether TGF-\\u03b2/VEGF/MAPK effects are direct or downstream of BMP antagonism\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 4, 5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 2, 4, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BMP4\", \"BMPR2\", \"BMPR1A\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}