{"gene":"CHRDL1","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2012,"finding":"Loss-of-function mutations (copy-number variation, frameshift, missense, splice-site, and nonsense) in CHRDL1 (encoding ventroptin, a BMP antagonist) cause X-linked megalocornea (MGC1), establishing CHRDL1 as essential for anterior segment development; CHRDL1 is expressed in the developing human cornea, anterior segment, and retina.","method":"Human genetic mutation identification (sequencing of seven MGC1 families) combined with expression analysis in developing human tissues","journal":"American Journal of Human Genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple mutation types across seven families with expression data, replicated genetic finding","pmids":["22284829"],"is_preprint":false},{"year":2015,"finding":"CHRDL1 knockdown in Xenopus laevis directly recapitulates the human X-linked megalocornea phenotype; loss of CHRDL1 leads to downregulation of bmp4 in the eye and altered phospho-SMAD1/5 signaling with reduced BMP receptor 1A, consistent with a negative-feedback regulatory loop due to deficient BMP antagonism. CHRDL1 is preferentially expressed in the limbal stem cell niche of adult human cornea.","method":"Xenopus laevis morpholino knockdown (in vivo model), immunofluorescence for phospho-SMAD1/5 and BMPR1A in patient tissue, expression analysis","journal":"Human Molecular Genetics","confidence":"High","confidence_rationale":"Tier 2 — in vivo loss-of-function model with direct pathway readout (pSMAD1/5, BMPR1A) and human patient tissue validation","pmids":["25712132"],"is_preprint":false},{"year":2017,"finding":"CHRDL1 acts as a secreted BMP antagonist that suppresses tumor cell proliferation and migration in gastric cancer by inhibiting BMPR II-mediated activation of Akt, Erk, and β-catenin; CHRDL1 promoter hypermethylation silences its expression, reducing its secretion.","method":"siRNA knockdown in vitro proliferation/migration assays, Western blot for Akt/Erk/β-catenin activation, promoter methylation analysis, in vivo xenograft experiments","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined cellular phenotype and pathway placement, single lab","pmids":["28423564"],"is_preprint":false},{"year":2022,"finding":"CHRDL1 maintains stemness in glioma stem-like cells (GSCs) by antagonizing BMP4; depletion of CHRDL1 via shRNA reduces functional and molecular stemness traits (sphere formation, limiting dilution, stem cell marker expression) and enhances radiation sensitivity.","method":"Stable shRNA knockdown in GSC spheroid cultures, MTT assay, limiting dilution assay, sphere formation assay, Western blot, qRT-PCR, irradiation assay","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype and mechanistic link to BMP4 antagonism, single lab","pmids":["36497175"],"is_preprint":false},{"year":2024,"finding":"CHRDL1 inhibits colorectal cancer cell growth, migration, invasion, and angiogenesis through downregulation of the TGF-β/VEGF signaling axis in vitro and in vivo.","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 — KD/OE with defined pathway placement (TGF-β/VEGF), confirmed in vivo, single lab","pmids":["38415870"],"is_preprint":false},{"year":2024,"finding":"CHRDL1 inhibits oral squamous cell carcinoma (OSCC) invasion and metastasis by suppressing MED29 expression through inhibition of the MAPK signaling pathway, thereby reducing epithelial-mesenchymal transition.","method":"RT-qPCR, Western blot, scratch/transwell/wound healing assays in OSCC cell lines, tail-vein lung metastasis nude mouse model","journal":"Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2 — KD/OE with pathway placement (MAPK/MED29/EMT), in vivo confirmation, single lab","pmids":["39462350"],"is_preprint":false},{"year":2020,"finding":"miR-200b-3p directly targets the 3' UTR of Chrdl1 (confirmed by dual-luciferase reporter assay), downregulating CHRDL1 expression to promote proliferation and migration of amniotic fluid-derived mesenchymal stromal cells.","method":"Dual-luciferase reporter assay, miRNA mimic/inhibitor transfection, proliferation and migration assays","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 — direct luciferase validation of miRNA-target interaction with functional readout, single lab","pmids":["32446365"],"is_preprint":false},{"year":2020,"finding":"miR-200b-3p targets Chrdl1 3'-UTR (validated by luciferase reporter assay) in osteoblast MC3T3-E1 cells; Chrdl1 overexpression reduces PA-induced apoptosis, and LBP protects osteoblasts partly by decreasing miR-200b-3p to upregulate Chrdl1, with co-expression between Chrdl1 and PPARγ identified.","method":"Luciferase reporter gene assay, flow cytometry for apoptosis, CCK-8 assay, RT-PCR, Western blot","journal":"Food & Nutrition Research","confidence":"Low","confidence_rationale":"Tier 3 — single lab, single reporter assay for miRNA targeting; functional mechanism partially defined","pmids":["33447177"],"is_preprint":false},{"year":2014,"finding":"Novel CHRDL1 missense mutations identified in X-linked megalocornea families; MGC1 patients have reduced central corneal thickness, and an intronic CHRDL1 variant (rs149956316) showed nominal association with central corneal thickness on the X-chromosome.","method":"Targeted and whole exome sequencing of MGC1 families, ultrasonography, GWAS of X-chromosome SNPs","journal":"PLoS One","confidence":"Medium","confidence_rationale":"Tier 2 — multiple families with loss-of-function mutations, functional anterior segment measurement, replication attempted","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 disrupting BMP/SMAD signaling in ocular tissues—and additionally suppresses tumor proliferation, migration, invasion, and angiogenesis in multiple cancer contexts by antagonizing BMP4, TGF-β/VEGF, and MAPK/MED29 signaling; its expression is regulated post-transcriptionally by miR-200b-3p targeting its 3' UTR and epigenetically by promoter hypermethylation."},"narrative":{"teleology":[{"year":2012,"claim":"Identification of diverse loss-of-function mutations in CHRDL1 across seven families established it as the causal gene for X-linked megalocornea and demonstrated its expression in the developing cornea and anterior segment, answering the long-standing question of the genetic basis of MGC1.","evidence":"Sequencing of seven MGC1 families identifying CNVs, frameshift, missense, splice-site, and nonsense mutations, combined with expression analysis in human fetal ocular tissues","pmids":["22284829"],"confidence":"High","gaps":["Mechanism by which CHRDL1 loss enlarges the cornea was not resolved","Whether BMP signaling pathway is directly dysregulated in patient tissue was untested","Role in adult corneal homeostasis versus embryonic development not distinguished"]},{"year":2014,"claim":"Additional CHRDL1 missense mutations in further MGC1 families and the association of an intronic variant with central corneal thickness extended the genotype-phenotype relationship, confirming CHRDL1's role in corneal structure.","evidence":"Targeted and whole-exome sequencing of MGC1 families with ultrasonographic corneal measurements and X-chromosome GWAS","pmids":["25093588"],"confidence":"Medium","gaps":["GWAS association with corneal thickness reached only nominal significance","No functional assay for the newly identified missense variants","Population-level effect size of common CHRDL1 variants on corneal thickness unknown"]},{"year":2015,"claim":"Xenopus morpholino knockdown of CHRDL1 recapitulated the megalocornea phenotype and revealed that loss of BMP antagonism disrupts a negative-feedback loop involving bmp4, phospho-SMAD1/5, and BMPR1A, establishing the mechanistic pathway through which CHRDL1 shapes anterior segment development.","evidence":"Xenopus laevis morpholino knockdown with in vivo phenotyping, immunofluorescence for pSMAD1/5 and BMPR1A in patient corneal tissue, limbal stem cell niche expression analysis","pmids":["25712132"],"confidence":"High","gaps":["Whether CHRDL1 binds BMP4 directly or other BMP ligands in the cornea not biochemically resolved","Downstream transcriptional targets of altered SMAD signaling in the cornea uncharacterized","Whether limbal niche expression reflects a functional role in corneal stem cell maintenance not tested"]},{"year":2017,"claim":"Demonstration that CHRDL1 suppresses gastric cancer cell proliferation and migration by inhibiting BMPRII-mediated Akt/Erk/β-catenin signaling, and that its expression is silenced by promoter hypermethylation, extended CHRDL1's BMP antagonist function into tumor suppression.","evidence":"siRNA knockdown, proliferation/migration assays, Western blot for Akt/Erk/β-catenin, methylation analysis, xenograft model in gastric cancer cell lines","pmids":["28423564"],"confidence":"Medium","gaps":["Which BMP ligand(s) CHRDL1 neutralizes in gastric tissue not identified","Single-lab finding without independent replication","Whether hypermethylation is a driver or passenger event in gastric tumorigenesis not established"]},{"year":2020,"claim":"Validation that miR-200b-3p directly targets the CHRDL1 3′ UTR to downregulate its expression established a post-transcriptional regulatory mechanism controlling CHRDL1 levels in mesenchymal stromal cells and osteoblasts.","evidence":"Dual-luciferase reporter assays in amniotic fluid-derived mesenchymal stromal cells and MC3T3-E1 osteoblasts, miRNA mimic/inhibitor transfection with proliferation and apoptosis readouts","pmids":["32446365","33447177"],"confidence":"Medium","gaps":["Whether miR-200b-3p regulation of CHRDL1 operates in corneal or cancer contexts not tested","Low-confidence osteoblast study (PMID:33447177) relies on a single reporter assay with partially defined mechanism","Other miRNAs targeting CHRDL1 not systematically surveyed"]},{"year":2022,"claim":"Showing that CHRDL1 maintains glioma stem-like cell stemness by antagonizing BMP4 revealed a context where CHRDL1 acts as a pro-tumorigenic factor, contrasting with its tumor-suppressive roles in epithelial cancers.","evidence":"Stable shRNA knockdown in GSC spheroid cultures with sphere formation, limiting dilution, radiation sensitivity assays, and BMP4 pathway analysis","pmids":["36497175"],"confidence":"Medium","gaps":["Whether CHRDL1 promotes stemness via direct BMP4 sequestration or indirect mechanisms not biochemically distinguished","Single-lab finding; in vivo xenograft validation of GSC stemness not performed","Generalizability to other glioma subtypes unknown"]},{"year":2024,"claim":"Extension of CHRDL1's tumor-suppressive function to colorectal cancer (via TGF-β/VEGF axis inhibition) and oral squamous cell carcinoma (via MAPK/MED29 suppression of EMT) broadened the downstream signaling pathways modulated by CHRDL1 beyond canonical BMP/SMAD.","evidence":"Overexpression/knockdown in CRC and OSCC cell lines with transwell, tube formation, and wound healing assays; tail-vein metastasis models; Western blot for TGF-β/VEGF and MAPK/MED29/EMT markers","pmids":["38415870","39462350"],"confidence":"Medium","gaps":["Whether TGF-β/VEGF and MAPK/MED29 inhibition results from direct BMP antagonism or independent mechanisms not resolved","Both findings from single labs without independent replication","Structural basis of CHRDL1's ligand specificity (BMP vs. TGF-β family members) remains undefined"]},{"year":null,"claim":"The structural determinants of CHRDL1's ligand selectivity among BMP/TGF-β superfamily members, and whether its opposing roles in glioma stemness versus epithelial tumor suppression reflect tissue-specific ligand availability or distinct binding partners, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No crystal structure or binding affinity measurements for CHRDL1–ligand interactions","No systematic comparison of CHRDL1 function across normal versus malignant tissues of the same origin","In vivo genetic models beyond Xenopus (e.g., conditional mouse knockout) not reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2,3]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,2]}],"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]}],"complexes":[],"partners":["BMP4","BMPR2"],"other_free_text":[]},"mechanistic_narrative":"CHRDL1 encodes ventroptin, a secreted BMP antagonist that modulates BMP/SMAD signaling during development and in adult tissues, with established roles in anterior segment morphogenesis, stem cell niche maintenance, and tumor suppression. Loss-of-function mutations in CHRDL1 cause X-linked megalocornea (MGC1), and Xenopus knockdown recapitulates this phenotype through dysregulated BMP4/phospho-SMAD1/5 signaling and reduced BMPR1A expression [PMID:22284829, PMID:25712132]. In cancer contexts, CHRDL1 suppresses proliferation, migration, invasion, and angiogenesis by inhibiting BMP receptor II–mediated Akt/Erk/β-catenin activation, TGF-β/VEGF signaling, and MAPK/MED29-driven epithelial–mesenchymal transition, while its expression is silenced by promoter hypermethylation [PMID:28423564, PMID:38415870, PMID:39462350]. CHRDL1 is post-transcriptionally regulated by miR-200b-3p, which directly targets its 3′ UTR to suppress expression [PMID:32446365]."},"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 CHL 1 (CTF 1) gene product of Saccharomyces cerevisiae is important for chromosome transmission and normal cell cycle progression in G2/M.","date":"1990","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/2265610","citation_count":137,"is_preprint":false},{"pmid":"10567032","id":"PMC_10567032","title":"Validation study of the in vitro micronucleus test in a Chinese hamster lung cell line (CHL/IU).","date":"1999","source":"Mutagenesis","url":"https://pubmed.ncbi.nlm.nih.gov/10567032","citation_count":132,"is_preprint":false},{"pmid":"24311067","id":"PMC_24311067","title":"Hypothesis for the evolution of three-helix Chl a/b and Chl a/c light-harvesting antenna proteins from two-helix and four-helix ancestors.","date":"1994","source":"Photosynthesis research","url":"https://pubmed.ncbi.nlm.nih.gov/24311067","citation_count":109,"is_preprint":false},{"pmid":"1090571","id":"PMC_1090571","title":"Positive selection of mutants with deletions of the gal-chl region of the Salmonella chromosome as a screening procedure for mutagens that cause deletions.","date":"1975","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/1090571","citation_count":109,"is_preprint":false},{"pmid":"3170654","id":"PMC_3170654","title":"Thermal analysis of CHL V79 cells using differential scanning calorimetry: implications for hyperthermic cell killing and the heat shock response.","date":"1988","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/3170654","citation_count":97,"is_preprint":false},{"pmid":"10320750","id":"PMC_10320750","title":"Characterization of p53 in Chinese hamster cell lines CHO-K1, CHO-WBL, and CHL: implications for genotoxicity testing.","date":"1999","source":"Mutation research","url":"https://pubmed.ncbi.nlm.nih.gov/10320750","citation_count":91,"is_preprint":false},{"pmid":"11842180","id":"PMC_11842180","title":"Chlorophyll biosynthesis. 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CHRDL1 is preferentially expressed in the limbal stem cell niche of adult human cornea.\",\n      \"method\": \"Xenopus laevis morpholino knockdown (in vivo model), immunofluorescence for phospho-SMAD1/5 and BMPR1A in patient tissue, expression analysis\",\n      \"journal\": \"Human Molecular Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function model with direct pathway readout (pSMAD1/5, BMPR1A) and human patient tissue validation\",\n      \"pmids\": [\"25712132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CHRDL1 acts as a secreted BMP antagonist that suppresses tumor cell proliferation and migration in gastric cancer by inhibiting BMPR II-mediated activation of Akt, Erk, and β-catenin; CHRDL1 promoter hypermethylation silences its expression, reducing its secretion.\",\n      \"method\": \"siRNA knockdown in vitro proliferation/migration assays, Western blot for Akt/Erk/β-catenin activation, promoter methylation analysis, in vivo xenograft experiments\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined cellular phenotype and pathway placement, single lab\",\n      \"pmids\": [\"28423564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHRDL1 maintains stemness in glioma stem-like cells (GSCs) by antagonizing BMP4; depletion of CHRDL1 via shRNA reduces functional and molecular stemness traits (sphere formation, limiting dilution, stem cell marker expression) and enhances radiation sensitivity.\",\n      \"method\": \"Stable shRNA knockdown in GSC spheroid cultures, MTT assay, limiting dilution assay, sphere formation assay, Western blot, qRT-PCR, irradiation assay\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype and mechanistic link to BMP4 antagonism, single lab\",\n      \"pmids\": [\"36497175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CHRDL1 inhibits colorectal cancer cell growth, migration, invasion, and angiogenesis through downregulation of the TGF-β/VEGF signaling axis in vitro and in vivo.\",\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 — KD/OE with defined pathway placement (TGF-β/VEGF), confirmed in vivo, single lab\",\n      \"pmids\": [\"38415870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CHRDL1 inhibits oral squamous cell carcinoma (OSCC) invasion and metastasis by suppressing MED29 expression through inhibition of the MAPK signaling pathway, thereby reducing epithelial-mesenchymal transition.\",\n      \"method\": \"RT-qPCR, Western blot, scratch/transwell/wound healing assays in OSCC cell lines, tail-vein lung metastasis nude mouse model\",\n      \"journal\": \"Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with pathway placement (MAPK/MED29/EMT), in vivo confirmation, single lab\",\n      \"pmids\": [\"39462350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-200b-3p directly targets the 3' UTR of Chrdl1 (confirmed by dual-luciferase reporter assay), downregulating CHRDL1 expression to promote proliferation and migration of amniotic fluid-derived mesenchymal stromal cells.\",\n      \"method\": \"Dual-luciferase reporter assay, miRNA mimic/inhibitor transfection, proliferation and migration assays\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct luciferase validation of miRNA-target interaction with functional readout, single lab\",\n      \"pmids\": [\"32446365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-200b-3p targets Chrdl1 3'-UTR (validated by luciferase reporter assay) in osteoblast MC3T3-E1 cells; Chrdl1 overexpression reduces PA-induced apoptosis, and LBP protects osteoblasts partly by decreasing miR-200b-3p to upregulate Chrdl1, with co-expression between Chrdl1 and PPARγ identified.\",\n      \"method\": \"Luciferase reporter gene assay, flow cytometry for apoptosis, CCK-8 assay, RT-PCR, Western blot\",\n      \"journal\": \"Food & Nutrition Research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single reporter assay for miRNA targeting; functional mechanism partially defined\",\n      \"pmids\": [\"33447177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Novel CHRDL1 missense mutations identified in X-linked megalocornea families; MGC1 patients have reduced central corneal thickness, and an intronic CHRDL1 variant (rs149956316) showed nominal association with central corneal thickness on the X-chromosome.\",\n      \"method\": \"Targeted and whole exome sequencing of MGC1 families, ultrasonography, GWAS of X-chromosome SNPs\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple families with loss-of-function mutations, functional anterior segment measurement, replication attempted\",\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 disrupting BMP/SMAD signaling in ocular tissues—and additionally suppresses tumor proliferation, migration, invasion, and angiogenesis in multiple cancer contexts by antagonizing BMP4, TGF-β/VEGF, and MAPK/MED29 signaling; its expression is regulated post-transcriptionally by miR-200b-3p targeting its 3' UTR and epigenetically by promoter hypermethylation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CHRDL1 encodes ventroptin, a secreted BMP antagonist that modulates BMP/SMAD signaling during development and in adult tissues, with established roles in anterior segment morphogenesis, stem cell niche maintenance, and tumor suppression. Loss-of-function mutations in CHRDL1 cause X-linked megalocornea (MGC1), and Xenopus knockdown recapitulates this phenotype through dysregulated BMP4/phospho-SMAD1/5 signaling and reduced BMPR1A expression [PMID:22284829, PMID:25712132]. In cancer contexts, CHRDL1 suppresses proliferation, migration, invasion, and angiogenesis by inhibiting BMP receptor II–mediated Akt/Erk/β-catenin activation, TGF-β/VEGF signaling, and MAPK/MED29-driven epithelial–mesenchymal transition, while its expression is silenced by promoter hypermethylation [PMID:28423564, PMID:38415870, PMID:39462350]. CHRDL1 is post-transcriptionally regulated by miR-200b-3p, which directly targets its 3′ UTR to suppress expression [PMID:32446365].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of diverse loss-of-function mutations in CHRDL1 across seven families established it as the causal gene for X-linked megalocornea and demonstrated its expression in the developing cornea and anterior segment, answering the long-standing question of the genetic basis of MGC1.\",\n      \"evidence\": \"Sequencing of seven MGC1 families identifying CNVs, frameshift, missense, splice-site, and nonsense mutations, combined with expression analysis in human fetal ocular tissues\",\n      \"pmids\": [\"22284829\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which CHRDL1 loss enlarges the cornea was not resolved\",\n        \"Whether BMP signaling pathway is directly dysregulated in patient tissue was untested\",\n        \"Role in adult corneal homeostasis versus embryonic development not distinguished\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Additional CHRDL1 missense mutations in further MGC1 families and the association of an intronic variant with central corneal thickness extended the genotype-phenotype relationship, confirming CHRDL1's role in corneal structure.\",\n      \"evidence\": \"Targeted and whole-exome sequencing of MGC1 families with ultrasonographic corneal measurements and X-chromosome GWAS\",\n      \"pmids\": [\"25093588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"GWAS association with corneal thickness reached only nominal significance\",\n        \"No functional assay for the newly identified missense variants\",\n        \"Population-level effect size of common CHRDL1 variants on corneal thickness unknown\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Xenopus morpholino knockdown of CHRDL1 recapitulated the megalocornea phenotype and revealed that loss of BMP antagonism disrupts a negative-feedback loop involving bmp4, phospho-SMAD1/5, and BMPR1A, establishing the mechanistic pathway through which CHRDL1 shapes anterior segment development.\",\n      \"evidence\": \"Xenopus laevis morpholino knockdown with in vivo phenotyping, immunofluorescence for pSMAD1/5 and BMPR1A in patient corneal tissue, limbal stem cell niche expression analysis\",\n      \"pmids\": [\"25712132\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether CHRDL1 binds BMP4 directly or other BMP ligands in the cornea not biochemically resolved\",\n        \"Downstream transcriptional targets of altered SMAD signaling in the cornea uncharacterized\",\n        \"Whether limbal niche expression reflects a functional role in corneal stem cell maintenance not tested\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstration that CHRDL1 suppresses gastric cancer cell proliferation and migration by inhibiting BMPRII-mediated Akt/Erk/β-catenin signaling, and that its expression is silenced by promoter hypermethylation, extended CHRDL1's BMP antagonist function into tumor suppression.\",\n      \"evidence\": \"siRNA knockdown, proliferation/migration assays, Western blot for Akt/Erk/β-catenin, methylation analysis, xenograft model in gastric cancer cell lines\",\n      \"pmids\": [\"28423564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Which BMP ligand(s) CHRDL1 neutralizes in gastric tissue not identified\",\n        \"Single-lab finding without independent replication\",\n        \"Whether hypermethylation is a driver or passenger event in gastric tumorigenesis not established\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Validation that miR-200b-3p directly targets the CHRDL1 3′ UTR to downregulate its expression established a post-transcriptional regulatory mechanism controlling CHRDL1 levels in mesenchymal stromal cells and osteoblasts.\",\n      \"evidence\": \"Dual-luciferase reporter assays in amniotic fluid-derived mesenchymal stromal cells and MC3T3-E1 osteoblasts, miRNA mimic/inhibitor transfection with proliferation and apoptosis readouts\",\n      \"pmids\": [\"32446365\", \"33447177\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether miR-200b-3p regulation of CHRDL1 operates in corneal or cancer contexts not tested\",\n        \"Low-confidence osteoblast study (PMID:33447177) relies on a single reporter assay with partially defined mechanism\",\n        \"Other miRNAs targeting CHRDL1 not systematically surveyed\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showing that CHRDL1 maintains glioma stem-like cell stemness by antagonizing BMP4 revealed a context where CHRDL1 acts as a pro-tumorigenic factor, contrasting with its tumor-suppressive roles in epithelial cancers.\",\n      \"evidence\": \"Stable shRNA knockdown in GSC spheroid cultures with sphere formation, limiting dilution, radiation sensitivity assays, and BMP4 pathway analysis\",\n      \"pmids\": [\"36497175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether CHRDL1 promotes stemness via direct BMP4 sequestration or indirect mechanisms not biochemically distinguished\",\n        \"Single-lab finding; in vivo xenograft validation of GSC stemness not performed\",\n        \"Generalizability to other glioma subtypes unknown\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extension of CHRDL1's tumor-suppressive function to colorectal cancer (via TGF-β/VEGF axis inhibition) and oral squamous cell carcinoma (via MAPK/MED29 suppression of EMT) broadened the downstream signaling pathways modulated by CHRDL1 beyond canonical BMP/SMAD.\",\n      \"evidence\": \"Overexpression/knockdown in CRC and OSCC cell lines with transwell, tube formation, and wound healing assays; tail-vein metastasis models; Western blot for TGF-β/VEGF and MAPK/MED29/EMT markers\",\n      \"pmids\": [\"38415870\", \"39462350\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether TGF-β/VEGF and MAPK/MED29 inhibition results from direct BMP antagonism or independent mechanisms not resolved\",\n        \"Both findings from single labs without independent replication\",\n        \"Structural basis of CHRDL1's ligand specificity (BMP vs. TGF-β family members) remains undefined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural determinants of CHRDL1's ligand selectivity among BMP/TGF-β superfamily members, and whether its opposing roles in glioma stemness versus epithelial tumor suppression reflect tissue-specific ligand availability or distinct binding partners, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No crystal structure or binding affinity measurements for CHRDL1–ligand interactions\",\n        \"No systematic comparison of CHRDL1 function across normal versus malignant tissues of the same origin\",\n        \"In vivo genetic models beyond Xenopus (e.g., conditional mouse knockout) not reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 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    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"BMP4\",\n      \"BMPR2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}