{"gene":"FEZF1","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2010,"finding":"FEZF1 (and FEZF2) directly bind to and repress the promoter activity of Hes5, thereby derepressing Neurogenin 2 and controlling differentiation of neural stem cells into early-born cortical neurons in the mouse forebrain. Loss of Hes5 suppresses the neurogenesis defects seen in Fezf1/Fezf2-deficient telencephalon.","method":"Promoter-luciferase assay, ChIP, genetic epistasis (Fezf1/Fezf2 double KO crossed with Hes5 KO), immunostaining","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 — direct promoter binding shown by ChIP + luciferase, confirmed by genetic epistasis rescue experiment","pmids":["20431123"],"is_preprint":false},{"year":2009,"finding":"Fezf1 is required for olfactory receptor neuron (ORN) axons to penetrate the CNS basal lamina at the olfactory bulb surface. In Fezf1-deficient mice, ORN axons fail to penetrate the basal lamina in vivo and show impaired penetration in Matrigel in vitro; removal of the meninges/basal lamina from the mutant OB rescues axonal projection.","method":"In vivo analysis of Fezf1-KO mice, in vitro Matrigel penetration assay, co-culture rescue experiment with meninges removed","journal":"The Journal of comparative neurology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal in vivo and in vitro approaches with mechanistic rescue experiment in single rigorous study","pmids":["19479999"],"is_preprint":false},{"year":2009,"finding":"FEZF1 (ZNF312b) encodes a transcriptional repressor containing an Engrailed homology 1 (Eh1) repressor motif that interacts with Groucho/TLE-type co-repressors, and is expressed in olfactory sensory neurons where it controls olfactory axon projection and olfactory bulb layer formation in a non-cell-autonomous manner.","method":"Loss-of-function studies in mouse; domain architecture analysis (Eh1 motif identification)","journal":"Development, growth & differentiation","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional KO phenotype with domain-based mechanistic inference; review/synthesis paper but grounded in experimental data","pmids":["19222525"],"is_preprint":false},{"year":2011,"finding":"FEZF1 regulates the identity of main olfactory epithelium (MOE) sensory neurons; in Fezf1-deficient mice, olfactory neurons fail to mature and instead express markers characteristic of functional vomeronasal organ (VNO) neurons, indicating FEZF1 is required for MOE versus VNO sensory neuron identity specification.","method":"Analysis of Fezf1-KO mice with immunostaining for MOE and VNO neuron markers","journal":"The Journal of comparative neurology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype (marker switching) replicated in context of prior KO work","pmids":["21452247"],"is_preprint":false},{"year":2014,"finding":"Homozygous loss-of-function mutations in human FEZF1 cause Kallmann syndrome by preventing olfactory receptor neuron axons from penetrating the CNS basal lamina, which also blocks the migratory pathway for GnRH neurons into the brain, establishing FEZF1 as required for the central component of the HPG axis in humans.","method":"Candidate-gene screening, autozygosity mapping, whole-exome sequencing in consanguineous KS families; identification of homozygous loss-of-function mutations","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — human genetics with two independent families; mechanistic pathway established by convergence with mouse data","pmids":["25192046"],"is_preprint":false},{"year":2019,"finding":"The transcriptional repressor FEZF1 is selectively expressed in postmitotic ON starburst amacrine cells (SACs) in the retina, where it promotes the ON fate and gene expression program while repressing the OFF fate program. FEZF1 represses Rnd3 (an atypical Rho GTPase expressed by OFF SACs) to regulate differential migration/positioning of the two cell types.","method":"Transcriptomic profiling of ON vs. OFF SACs, Fezf1 conditional KO, gain-of-function experiments, in situ hybridization, immunostaining","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 — KO with defined cellular phenotype, transcriptomic profiling, and identification of direct downstream target (Rnd3)","pmids":["31812516"],"is_preprint":false},{"year":2009,"finding":"Human ZNF312b (FEZF1) acts as a transcriptional activator of the K-ras oncogene in gastric cancer cells, translocating to the nucleus via its proline-rich C-terminal domain to activate K-ras promoter-driven transcription and enhance ERK signaling and cell proliferation.","method":"Luciferase reporter assay with K-ras promoter deletion mutants, ZNF312b domain deletion mutants, nuclear translocation assay, gain/loss-of-function in gastric cancer cell lines, nude mouse xenograft","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — direct promoter assay with domain mutagenesis, multiple orthogonal methods in single study","pmids":["19318583"],"is_preprint":false},{"year":2011,"finding":"Transcriptional activation of ZNF312b (FEZF1) in gastric cancer requires DNA demethylation and histone acetylation at its promoter; the transcription factor Sp1 binds the ZNF312b promoter and drives its expression only after epigenetic activation, and Sp1 knockdown reduces ERK-mediated proliferation via ZNF312b downregulation.","method":"ChIP with anti-acetyl/methyl H3K9 and anti-Sp1 antibodies, pyrosequencing/bisulfite sequencing/MSP for DNA methylation, treatment with 5-aza-2'-deoxycytidine and sodium butyrate, Sp1 knockdown","journal":"International journal of cancer","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP combined with functional methylation/acetylation manipulations and knockdown, multiple orthogonal methods","pmids":["21170990"],"is_preprint":false},{"year":2017,"finding":"FEZF1 protein in glioma stem cells transcriptionally activates the CDC25A oncogene promoter (shown by ChIP); elevated CDC25A then activates PI3K/AKT pathways, driving malignant GSC behavior. FEZF1 is itself a direct target of miR-103a-3p in this axis.","method":"ChIP assay for FEZF1 binding to CDC25A promoter; luciferase reporter; Western blot; gain/loss-of-function in glioma stem cells","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and luciferase reporter with functional validation, single lab","pmids":["28651608"],"is_preprint":false},{"year":2018,"finding":"FEZF1 promotes cell proliferation and migration in cervical cancer cells; ChIP assay shows FEZF1 binds to promoters of multiple Wnt signaling pathway genes in HeLa cells, and FEZF1 expression increases nuclear β-catenin levels, indicating it acts as a transcriptional activator of the Wnt pathway.","method":"RNA interference KD and overexpression, ChIP assay, Western blot for β-catenin, nude mouse xenograft","journal":"Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP demonstrating direct promoter binding combined with functional KD/OE, single lab","pmids":["30410597"],"is_preprint":false},{"year":2018,"finding":"FEZF1 is required for early human neural differentiation: CRISPR-Cas9 knockout of FEZF1 in human ESCs abrogates neural differentiation and impairs pluripotency exit during neural specification, but enforced FEZF1 expression alone is insufficient to drive neural differentiation, showing FEZF1 is necessary but not sufficient.","method":"CRISPR-Cas9 KO in H1 hESCs, chemical neural induction protocol, molecular profiling, FEZF1 overexpression","journal":"Science China. Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 — clean CRISPR KO with defined developmental phenotype and gain-of-function control, single lab","pmids":["29318501"],"is_preprint":false},{"year":2017,"finding":"Downregulation of Fezf1 in the ventromedial nucleus of the hypothalamus (VMN) via shRNA reduces female sexual behavior in mice, accompanied by a significant reduction in estrogen receptor alpha (ERα)-immunoreactive cells in the VMN, indicating Fezf1 regulates ERα expression in this region to control sexual behavior.","method":"Stereotaxic lentiviral shRNA injection into VMN of adult female mice, behavioral assays, ERα immunohistochemistry","journal":"Hormones and behavior","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo KD with defined behavioral and molecular phenotype, single lab","pmids":["29080672"],"is_preprint":false},{"year":2021,"finding":"FEZF1 is a direct transcriptional target of the Ewing sarcoma fusion protein EWSR1-FLI1, and FEZF1 in turn regulates neural-specific gene expression in Ewing sarcoma cells; FEZF1 knockdown inhibits clonogenicity and cell proliferation.","method":"Transcriptomic analysis of A673 cells with EWSR1-FLI1 manipulation, shRNA knockdown of FEZF1 in three Ewing sarcoma cell lines, FEZF1-dependent expression profiling","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptomic evidence of direct regulation plus KD with defined proliferative phenotype, single lab","pmids":["34830820"],"is_preprint":false}],"current_model":"FEZF1 is a C2H2-type zinc-finger transcriptional repressor (containing an Eh1/Groucho-interaction motif) that controls forebrain and olfactory system development by directly repressing Hes5 to derepress Neurogenin 2 in neural progenitors, enables olfactory receptor neuron axons to penetrate the CNS basal lamina (required for GnRH neuron migration and establishment of the HPG axis in humans), specifies main olfactory epithelium versus vomeronasal sensory neuron identity, and in postmitotic retinal neurons acts as a binary fate switch promoting ON versus OFF starburst amacrine cell identity by repressing Rnd3; in cancer contexts FEZF1 also functions as a nuclear transcriptional activator of K-ras (via its proline-rich domain) and of Wnt pathway genes, and is itself epigenetically regulated by DNA methylation and histone acetylation with Sp1-dependent transcriptional control."},"narrative":{"teleology":[{"year":2009,"claim":"Establishing that FEZF1 contains an Eh1 repressor motif and functions as a transcriptional repressor controlling olfactory axon projection and bulb layer formation resolved how a zinc-finger protein could recruit co-repressors to regulate olfactory development.","evidence":"Domain architecture analysis and Fezf1-KO mouse phenotyping","pmids":["19222525"],"confidence":"Medium","gaps":["Direct interaction with Groucho/TLE co-repressors not demonstrated biochemically","Downstream transcriptional targets in olfactory neurons not identified"]},{"year":2009,"claim":"Demonstrating that Fezf1 is required for olfactory receptor neuron axons to penetrate the CNS basal lamina—and that removing the meninges rescues axon projection—identified the cellular barrier mechanism underlying the Fezf1-null olfactory bulb phenotype.","evidence":"Fezf1-KO mice, in vitro Matrigel penetration assay, co-culture rescue with meninges removed","pmids":["19479999"],"confidence":"High","gaps":["Molecular effectors downstream of FEZF1 that mediate basal lamina penetration unknown","Whether FEZF1 regulates protease expression or ECM remodeling not tested"]},{"year":2009,"claim":"Showing that FEZF1 (ZNF312b) translocates to the nucleus via its proline-rich domain and directly activates the K-ras promoter in gastric cancer cells revealed a context-dependent activator function distinct from its developmental repressor role.","evidence":"Luciferase reporter with K-ras promoter deletion mutants, domain deletion mutagenesis, nuclear translocation assay, gain/loss-of-function in gastric cancer cell lines and nude mouse xenograft","pmids":["19318583"],"confidence":"High","gaps":["How the same protein switches between repressor and activator modes not explained","Cofactors mediating transcriptional activation not identified"]},{"year":2010,"claim":"Identifying Hes5 as a direct transcriptional target repressed by FEZF1 (and FEZF2), with genetic epistasis showing Hes5 loss rescues the Fezf1/Fezf2 neurogenesis defect, established the core mechanism by which FEZF1 promotes cortical neurogenesis through derepression of Neurogenin 2.","evidence":"ChIP, promoter-luciferase assay, Fezf1/Fezf2 double KO crossed with Hes5 KO in mouse telencephalon","pmids":["20431123"],"confidence":"High","gaps":["Whether FEZF1 and FEZF2 have distinct or fully redundant targets beyond Hes5 not resolved","Genome-wide direct targets in neural progenitors not mapped"]},{"year":2011,"claim":"Demonstrating that Fezf1-deficient olfactory neurons express vomeronasal markers instead of main olfactory markers established FEZF1 as a binary identity switch for chemosensory neuron subtype specification.","evidence":"Fezf1-KO mouse analysis with MOE and VNO neuron marker immunostaining","pmids":["21452247"],"confidence":"High","gaps":["Direct transcriptional targets mediating MOE vs VNO identity not identified","Whether FEZF1 represses VNO gene promoters directly or indirectly unknown"]},{"year":2011,"claim":"Showing that FEZF1 promoter activation in gastric cancer requires DNA demethylation and histone acetylation, with Sp1 binding only after epigenetic derepression, established the epigenetic gating mechanism for aberrant FEZF1 expression in cancer.","evidence":"ChIP for histone marks and Sp1, bisulfite sequencing, 5-aza-dC and sodium butyrate treatment, Sp1 knockdown in gastric cancer cells","pmids":["21170990"],"confidence":"High","gaps":["Which demethylases or acetyltransferases act at the FEZF1 promoter in vivo unknown","Whether the same epigenetic mechanism operates in other cancers not tested"]},{"year":2014,"claim":"Identifying homozygous loss-of-function FEZF1 mutations in consanguineous Kallmann syndrome families linked the mouse basal lamina penetration phenotype to a human Mendelian disorder of GnRH neuron migration and HPG axis failure.","evidence":"Autozygosity mapping and whole-exome sequencing in two independent KS families","pmids":["25192046"],"confidence":"High","gaps":["Functional rescue of human mutations not performed","Whether heterozygous carriers show partial phenotypes not assessed"]},{"year":2017,"claim":"Demonstrating that FEZF1 directly binds and activates the CDC25A promoter in glioma stem cells, regulated by miR-103a-3p, extended its oncogenic activator role to PI3K/AKT signaling beyond ERK.","evidence":"ChIP for FEZF1 at CDC25A promoter, luciferase reporter, gain/loss-of-function in glioma stem cells","pmids":["28651608"],"confidence":"Medium","gaps":["Single lab finding; independent replication needed","Whether FEZF1 activates CDC25A in non-GSC contexts unknown"]},{"year":2017,"claim":"Showing that Fezf1 knockdown in the ventromedial hypothalamus reduces ERα-immunoreactive cells and impairs female sexual behavior revealed a post-developmental role for FEZF1 in maintaining hypothalamic neuron identity and neuroendocrine function.","evidence":"Stereotaxic lentiviral shRNA injection into VMN of adult female mice, behavioral assays, ERα immunohistochemistry","pmids":["29080672"],"confidence":"Medium","gaps":["Whether FEZF1 directly regulates ERα transcription or acts indirectly unknown","Single lab with shRNA approach; off-target effects not fully excluded"]},{"year":2018,"claim":"CRISPR knockout of FEZF1 in human ESCs blocked neural differentiation and impaired pluripotency exit, establishing that FEZF1 is necessary—but not sufficient—for early human neural specification, extending its requirement from mouse to human.","evidence":"CRISPR-Cas9 KO in H1 hESCs with chemical neural induction, FEZF1 overexpression control","pmids":["29318501"],"confidence":"Medium","gaps":["Downstream targets in human neural specification not identified","Single hESC line tested; generalizability across genetic backgrounds not shown"]},{"year":2018,"claim":"ChIP evidence that FEZF1 binds Wnt pathway gene promoters and increases nuclear β-catenin in cervical cancer cells broadened its oncogenic transcriptional activator function to a third signaling pathway.","evidence":"ChIP assay in HeLa cells, FEZF1 RNAi and overexpression, Western blot for β-catenin, nude mouse xenograft","pmids":["30410597"],"confidence":"Medium","gaps":["Specific Wnt target gene promoters bound by FEZF1 not individually validated","Mechanism by which FEZF1 increases nuclear β-catenin not dissected"]},{"year":2019,"claim":"Identifying FEZF1 as a postmitotic fate switch in retinal starburst amacrine cells—promoting ON identity while directly repressing Rnd3 to suppress OFF identity and migration—demonstrated a cell-type-level binary switch mechanism beyond olfactory and cortical systems.","evidence":"Transcriptomic profiling of ON vs OFF SACs, Fezf1 conditional KO, gain-of-function, in situ hybridization","pmids":["31812516"],"confidence":"High","gaps":["Whether FEZF1 directly binds the Rnd3 promoter not shown by ChIP","Additional downstream targets mediating the ON gene program not fully mapped"]},{"year":null,"claim":"The mechanism by which FEZF1 switches between transcriptional repressor (developmental contexts) and activator (cancer contexts) functions remains unresolved, as do the cofactors and chromatin states that determine this switch.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural data on FEZF1 protein or its zinc-finger/DNA complexes","Genome-wide binding profiles (ChIP-seq) in developmental and cancer contexts lacking","How FEZF1 mediates basal lamina penetration at the molecular effector level is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,6,8,9]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,5,6,7,8,9]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,8,9]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1,3,5,10]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[1,3,5,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,8,9]}],"complexes":[],"partners":["HES5","RND3","SP1"],"other_free_text":[]},"mechanistic_narrative":"FEZF1 is a C2H2-type zinc-finger transcription factor that functions as a context-dependent transcriptional regulator controlling neural cell fate specification, axon guidance, and, when aberrantly expressed, oncogenic gene programs. In neural development, FEZF1 acts as a transcriptional repressor—utilizing an Engrailed homology 1 (Eh1) motif to recruit Groucho/TLE co-repressors—that directly represses Hes5 to derepress Neurogenin 2 and promote cortical neurogenesis [PMID:20431123, PMID:19222525], specifies main olfactory epithelium versus vomeronasal neuron identity [PMID:21452247], enables olfactory receptor neuron axons to penetrate the CNS basal lamina [PMID:19479999], and acts as a binary ON/OFF starburst amacrine cell fate switch in the retina by repressing Rnd3 [PMID:31812516]. Homozygous loss-of-function mutations in FEZF1 cause Kallmann syndrome in humans by disrupting olfactory axon penetration and consequently blocking GnRH neuron migration required for hypothalamic–pituitary–gonadal axis establishment [PMID:25192046]. In cancer contexts, FEZF1 functions as a transcriptional activator—translocating to the nucleus via its proline-rich domain—to directly activate promoters of K-ras, CDC25A, and Wnt pathway genes, thereby driving ERK, PI3K/AKT, and β-catenin signaling and cell proliferation [PMID:19318583, PMID:28651608, PMID:30410597]."},"prefetch_data":{"uniprot":{"accession":"A0PJY2","full_name":"Fez family zinc finger protein 1","aliases":["Zinc finger protein 312B"],"length_aa":475,"mass_kda":52.0,"function":"Transcription repressor. Involved in the axonal projection and proper termination of olfactory sensory neurons (OSN). Plays a role in rostro-caudal patterning of the diencephalon and in prethalamic formation. Expression is required in OSN to cell-autonomously regulate OSN axon projections. Regulates non-cell-autonomously the layer formation of the olfactory bulb development and the interneurons. May be required for correct rostral migration of the interneuron progenitors (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/A0PJY2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FEZF1","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/FEZF1","total_profiled":1310},"omim":[{"mim_id":"616031","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 141; CCDC141","url":"https://www.omim.org/entry/616031"},{"mim_id":"616030","title":"HYPOGONADOTROPIC HYPOGONADISM 22 WITH OR WITHOUT ANOSMIA; HH22","url":"https://www.omim.org/entry/616030"},{"mim_id":"613301","title":"FEZ FAMILY ZINC FINGER PROTEIN 1; FEZF1","url":"https://www.omim.org/entry/613301"},{"mim_id":"147950","title":"HYPOGONADOTROPIC HYPOGONADISM 2 WITH OR WITHOUT ANOSMIA; HH2","url":"https://www.omim.org/entry/147950"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":13.1},{"tissue":"pituitary gland","ntpm":3.0},{"tissue":"testis","ntpm":4.2}],"url":"https://www.proteinatlas.org/search/FEZF1"},"hgnc":{"alias_symbol":[],"prev_symbol":["ZNF312B"]},"alphafold":{"accession":"A0PJY2","domains":[{"cath_id":"3.30.160.60","chopping":"268-314","consensus_level":"medium","plddt":82.2243,"start":268,"end":314},{"cath_id":"3.30.160.60","chopping":"315-367","consensus_level":"medium","plddt":84.8285,"start":315,"end":367}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/A0PJY2","model_url":"https://alphafold.ebi.ac.uk/files/AF-A0PJY2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-A0PJY2-F1-predicted_aligned_error_v6.png","plddt_mean":56.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FEZF1","jax_strain_url":"https://www.jax.org/strain/search?query=FEZF1"},"sequence":{"accession":"A0PJY2","fasta_url":"https://rest.uniprot.org/uniprotkb/A0PJY2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/A0PJY2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/A0PJY2"}},"corpus_meta":[{"pmid":"29914894","id":"PMC_29914894","title":"LncRNA-FEZF1-AS1 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lncRNA FEZF1-AS1 Promotes the Progression of Colorectal Cancer Through Regulating OTX1 and Targeting miR-30a-5p.","date":"2019","source":"Oncology research","url":"https://pubmed.ncbi.nlm.nih.gov/31270006","citation_count":45,"is_preprint":false},{"pmid":"33174014","id":"PMC_33174014","title":"Long non‑coding RNA FEZF1‑AS1 facilitates non‑small cell lung cancer progression via the ITGA11/miR‑516b‑5p axis.","date":"2020","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/33174014","citation_count":41,"is_preprint":false},{"pmid":"29510778","id":"PMC_29510778","title":"Long Noncoding RNA FEZF1-AS1 Promotes Osteosarcoma Progression by Regulating the miR-4443/NUPR1 Axis.","date":"2018","source":"Oncology research","url":"https://pubmed.ncbi.nlm.nih.gov/29510778","citation_count":40,"is_preprint":false},{"pmid":"29864963","id":"PMC_29864963","title":"Long non-coding RNA FEZF1-AS1 promotes cell growth in multiple myeloma via miR-610/Akt3 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Determined by a Fezf1-Dependent Postmitotic Transcriptional Switch.","date":"2019","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/31812516","citation_count":31,"is_preprint":false},{"pmid":"30365146","id":"PMC_30365146","title":"lncRNA FEZF1‑AS1 contributes to cell proliferation, migration and invasion by sponging miR‑4443 in hepatocellular carcinoma.","date":"2018","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/30365146","citation_count":29,"is_preprint":false},{"pmid":"31175144","id":"PMC_31175144","title":"FEZF1-AS1: a novel vital oncogenic lncRNA in multiple human malignancies.","date":"2019","source":"Bioscience reports","url":"https://pubmed.ncbi.nlm.nih.gov/31175144","citation_count":29,"is_preprint":false},{"pmid":"32638620","id":"PMC_32638620","title":"LncRNA FEZF1-AS1 Modulates Cancer Stem Cell Properties of Human Gastric Cancer Through miR-363-3p/HMGA2.","date":"2020","source":"Cell 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Loss of Hes5 suppresses the neurogenesis defects seen in Fezf1/Fezf2-deficient telencephalon.\",\n      \"method\": \"Promoter-luciferase assay, ChIP, genetic epistasis (Fezf1/Fezf2 double KO crossed with Hes5 KO), immunostaining\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct promoter binding shown by ChIP + luciferase, confirmed by genetic epistasis rescue experiment\",\n      \"pmids\": [\"20431123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Fezf1 is required for olfactory receptor neuron (ORN) axons to penetrate the CNS basal lamina at the olfactory bulb surface. In Fezf1-deficient mice, ORN axons fail to penetrate the basal lamina in vivo and show impaired penetration in Matrigel in vitro; removal of the meninges/basal lamina from the mutant OB rescues axonal projection.\",\n      \"method\": \"In vivo analysis of Fezf1-KO mice, in vitro Matrigel penetration assay, co-culture rescue experiment with meninges removed\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal in vivo and in vitro approaches with mechanistic rescue experiment in single rigorous study\",\n      \"pmids\": [\"19479999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FEZF1 (ZNF312b) encodes a transcriptional repressor containing an Engrailed homology 1 (Eh1) repressor motif that interacts with Groucho/TLE-type co-repressors, and is expressed in olfactory sensory neurons where it controls olfactory axon projection and olfactory bulb layer formation in a non-cell-autonomous manner.\",\n      \"method\": \"Loss-of-function studies in mouse; domain architecture analysis (Eh1 motif identification)\",\n      \"journal\": \"Development, growth & differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional KO phenotype with domain-based mechanistic inference; review/synthesis paper but grounded in experimental data\",\n      \"pmids\": [\"19222525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"FEZF1 regulates the identity of main olfactory epithelium (MOE) sensory neurons; in Fezf1-deficient mice, olfactory neurons fail to mature and instead express markers characteristic of functional vomeronasal organ (VNO) neurons, indicating FEZF1 is required for MOE versus VNO sensory neuron identity specification.\",\n      \"method\": \"Analysis of Fezf1-KO mice with immunostaining for MOE and VNO neuron markers\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype (marker switching) replicated in context of prior KO work\",\n      \"pmids\": [\"21452247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Homozygous loss-of-function mutations in human FEZF1 cause Kallmann syndrome by preventing olfactory receptor neuron axons from penetrating the CNS basal lamina, which also blocks the migratory pathway for GnRH neurons into the brain, establishing FEZF1 as required for the central component of the HPG axis in humans.\",\n      \"method\": \"Candidate-gene screening, autozygosity mapping, whole-exome sequencing in consanguineous KS families; identification of homozygous loss-of-function mutations\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetics with two independent families; mechanistic pathway established by convergence with mouse data\",\n      \"pmids\": [\"25192046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The transcriptional repressor FEZF1 is selectively expressed in postmitotic ON starburst amacrine cells (SACs) in the retina, where it promotes the ON fate and gene expression program while repressing the OFF fate program. FEZF1 represses Rnd3 (an atypical Rho GTPase expressed by OFF SACs) to regulate differential migration/positioning of the two cell types.\",\n      \"method\": \"Transcriptomic profiling of ON vs. OFF SACs, Fezf1 conditional KO, gain-of-function experiments, in situ hybridization, immunostaining\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — KO with defined cellular phenotype, transcriptomic profiling, and identification of direct downstream target (Rnd3)\",\n      \"pmids\": [\"31812516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human ZNF312b (FEZF1) acts as a transcriptional activator of the K-ras oncogene in gastric cancer cells, translocating to the nucleus via its proline-rich C-terminal domain to activate K-ras promoter-driven transcription and enhance ERK signaling and cell proliferation.\",\n      \"method\": \"Luciferase reporter assay with K-ras promoter deletion mutants, ZNF312b domain deletion mutants, nuclear translocation assay, gain/loss-of-function in gastric cancer cell lines, nude mouse xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct promoter assay with domain mutagenesis, multiple orthogonal methods in single study\",\n      \"pmids\": [\"19318583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Transcriptional activation of ZNF312b (FEZF1) in gastric cancer requires DNA demethylation and histone acetylation at its promoter; the transcription factor Sp1 binds the ZNF312b promoter and drives its expression only after epigenetic activation, and Sp1 knockdown reduces ERK-mediated proliferation via ZNF312b downregulation.\",\n      \"method\": \"ChIP with anti-acetyl/methyl H3K9 and anti-Sp1 antibodies, pyrosequencing/bisulfite sequencing/MSP for DNA methylation, treatment with 5-aza-2'-deoxycytidine and sodium butyrate, Sp1 knockdown\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP combined with functional methylation/acetylation manipulations and knockdown, multiple orthogonal methods\",\n      \"pmids\": [\"21170990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FEZF1 protein in glioma stem cells transcriptionally activates the CDC25A oncogene promoter (shown by ChIP); elevated CDC25A then activates PI3K/AKT pathways, driving malignant GSC behavior. FEZF1 is itself a direct target of miR-103a-3p in this axis.\",\n      \"method\": \"ChIP assay for FEZF1 binding to CDC25A promoter; luciferase reporter; Western blot; gain/loss-of-function in glioma stem cells\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and luciferase reporter with functional validation, single lab\",\n      \"pmids\": [\"28651608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FEZF1 promotes cell proliferation and migration in cervical cancer cells; ChIP assay shows FEZF1 binds to promoters of multiple Wnt signaling pathway genes in HeLa cells, and FEZF1 expression increases nuclear β-catenin levels, indicating it acts as a transcriptional activator of the Wnt pathway.\",\n      \"method\": \"RNA interference KD and overexpression, ChIP assay, Western blot for β-catenin, nude mouse xenograft\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating direct promoter binding combined with functional KD/OE, single lab\",\n      \"pmids\": [\"30410597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FEZF1 is required for early human neural differentiation: CRISPR-Cas9 knockout of FEZF1 in human ESCs abrogates neural differentiation and impairs pluripotency exit during neural specification, but enforced FEZF1 expression alone is insufficient to drive neural differentiation, showing FEZF1 is necessary but not sufficient.\",\n      \"method\": \"CRISPR-Cas9 KO in H1 hESCs, chemical neural induction protocol, molecular profiling, FEZF1 overexpression\",\n      \"journal\": \"Science China. Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean CRISPR KO with defined developmental phenotype and gain-of-function control, single lab\",\n      \"pmids\": [\"29318501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Downregulation of Fezf1 in the ventromedial nucleus of the hypothalamus (VMN) via shRNA reduces female sexual behavior in mice, accompanied by a significant reduction in estrogen receptor alpha (ERα)-immunoreactive cells in the VMN, indicating Fezf1 regulates ERα expression in this region to control sexual behavior.\",\n      \"method\": \"Stereotaxic lentiviral shRNA injection into VMN of adult female mice, behavioral assays, ERα immunohistochemistry\",\n      \"journal\": \"Hormones and behavior\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KD with defined behavioral and molecular phenotype, single lab\",\n      \"pmids\": [\"29080672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FEZF1 is a direct transcriptional target of the Ewing sarcoma fusion protein EWSR1-FLI1, and FEZF1 in turn regulates neural-specific gene expression in Ewing sarcoma cells; FEZF1 knockdown inhibits clonogenicity and cell proliferation.\",\n      \"method\": \"Transcriptomic analysis of A673 cells with EWSR1-FLI1 manipulation, shRNA knockdown of FEZF1 in three Ewing sarcoma cell lines, FEZF1-dependent expression profiling\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptomic evidence of direct regulation plus KD with defined proliferative phenotype, single lab\",\n      \"pmids\": [\"34830820\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FEZF1 is a C2H2-type zinc-finger transcriptional repressor (containing an Eh1/Groucho-interaction motif) that controls forebrain and olfactory system development by directly repressing Hes5 to derepress Neurogenin 2 in neural progenitors, enables olfactory receptor neuron axons to penetrate the CNS basal lamina (required for GnRH neuron migration and establishment of the HPG axis in humans), specifies main olfactory epithelium versus vomeronasal sensory neuron identity, and in postmitotic retinal neurons acts as a binary fate switch promoting ON versus OFF starburst amacrine cell identity by repressing Rnd3; in cancer contexts FEZF1 also functions as a nuclear transcriptional activator of K-ras (via its proline-rich domain) and of Wnt pathway genes, and is itself epigenetically regulated by DNA methylation and histone acetylation with Sp1-dependent transcriptional control.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FEZF1 is a C2H2-type zinc-finger transcription factor that functions as a context-dependent transcriptional regulator controlling neural cell fate specification, axon guidance, and, when aberrantly expressed, oncogenic gene programs. In neural development, FEZF1 acts as a transcriptional repressor—utilizing an Engrailed homology 1 (Eh1) motif to recruit Groucho/TLE co-repressors—that directly represses Hes5 to derepress Neurogenin 2 and promote cortical neurogenesis [PMID:20431123, PMID:19222525], specifies main olfactory epithelium versus vomeronasal neuron identity [PMID:21452247], enables olfactory receptor neuron axons to penetrate the CNS basal lamina [PMID:19479999], and acts as a binary ON/OFF starburst amacrine cell fate switch in the retina by repressing Rnd3 [PMID:31812516]. Homozygous loss-of-function mutations in FEZF1 cause Kallmann syndrome in humans by disrupting olfactory axon penetration and consequently blocking GnRH neuron migration required for hypothalamic–pituitary–gonadal axis establishment [PMID:25192046]. In cancer contexts, FEZF1 functions as a transcriptional activator—translocating to the nucleus via its proline-rich domain—to directly activate promoters of K-ras, CDC25A, and Wnt pathway genes, thereby driving ERK, PI3K/AKT, and β-catenin signaling and cell proliferation [PMID:19318583, PMID:28651608, PMID:30410597].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing that FEZF1 contains an Eh1 repressor motif and functions as a transcriptional repressor controlling olfactory axon projection and bulb layer formation resolved how a zinc-finger protein could recruit co-repressors to regulate olfactory development.\",\n      \"evidence\": \"Domain architecture analysis and Fezf1-KO mouse phenotyping\",\n      \"pmids\": [\"19222525\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct interaction with Groucho/TLE co-repressors not demonstrated biochemically\", \"Downstream transcriptional targets in olfactory neurons not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating that Fezf1 is required for olfactory receptor neuron axons to penetrate the CNS basal lamina—and that removing the meninges rescues axon projection—identified the cellular barrier mechanism underlying the Fezf1-null olfactory bulb phenotype.\",\n      \"evidence\": \"Fezf1-KO mice, in vitro Matrigel penetration assay, co-culture rescue with meninges removed\",\n      \"pmids\": [\"19479999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular effectors downstream of FEZF1 that mediate basal lamina penetration unknown\", \"Whether FEZF1 regulates protease expression or ECM remodeling not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showing that FEZF1 (ZNF312b) translocates to the nucleus via its proline-rich domain and directly activates the K-ras promoter in gastric cancer cells revealed a context-dependent activator function distinct from its developmental repressor role.\",\n      \"evidence\": \"Luciferase reporter with K-ras promoter deletion mutants, domain deletion mutagenesis, nuclear translocation assay, gain/loss-of-function in gastric cancer cell lines and nude mouse xenograft\",\n      \"pmids\": [\"19318583\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the same protein switches between repressor and activator modes not explained\", \"Cofactors mediating transcriptional activation not identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying Hes5 as a direct transcriptional target repressed by FEZF1 (and FEZF2), with genetic epistasis showing Hes5 loss rescues the Fezf1/Fezf2 neurogenesis defect, established the core mechanism by which FEZF1 promotes cortical neurogenesis through derepression of Neurogenin 2.\",\n      \"evidence\": \"ChIP, promoter-luciferase assay, Fezf1/Fezf2 double KO crossed with Hes5 KO in mouse telencephalon\",\n      \"pmids\": [\"20431123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FEZF1 and FEZF2 have distinct or fully redundant targets beyond Hes5 not resolved\", \"Genome-wide direct targets in neural progenitors not mapped\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrating that Fezf1-deficient olfactory neurons express vomeronasal markers instead of main olfactory markers established FEZF1 as a binary identity switch for chemosensory neuron subtype specification.\",\n      \"evidence\": \"Fezf1-KO mouse analysis with MOE and VNO neuron marker immunostaining\",\n      \"pmids\": [\"21452247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets mediating MOE vs VNO identity not identified\", \"Whether FEZF1 represses VNO gene promoters directly or indirectly unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing that FEZF1 promoter activation in gastric cancer requires DNA demethylation and histone acetylation, with Sp1 binding only after epigenetic derepression, established the epigenetic gating mechanism for aberrant FEZF1 expression in cancer.\",\n      \"evidence\": \"ChIP for histone marks and Sp1, bisulfite sequencing, 5-aza-dC and sodium butyrate treatment, Sp1 knockdown in gastric cancer cells\",\n      \"pmids\": [\"21170990\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which demethylases or acetyltransferases act at the FEZF1 promoter in vivo unknown\", \"Whether the same epigenetic mechanism operates in other cancers not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying homozygous loss-of-function FEZF1 mutations in consanguineous Kallmann syndrome families linked the mouse basal lamina penetration phenotype to a human Mendelian disorder of GnRH neuron migration and HPG axis failure.\",\n      \"evidence\": \"Autozygosity mapping and whole-exome sequencing in two independent KS families\",\n      \"pmids\": [\"25192046\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional rescue of human mutations not performed\", \"Whether heterozygous carriers show partial phenotypes not assessed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that FEZF1 directly binds and activates the CDC25A promoter in glioma stem cells, regulated by miR-103a-3p, extended its oncogenic activator role to PI3K/AKT signaling beyond ERK.\",\n      \"evidence\": \"ChIP for FEZF1 at CDC25A promoter, luciferase reporter, gain/loss-of-function in glioma stem cells\",\n      \"pmids\": [\"28651608\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab finding; independent replication needed\", \"Whether FEZF1 activates CDC25A in non-GSC contexts unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing that Fezf1 knockdown in the ventromedial hypothalamus reduces ERα-immunoreactive cells and impairs female sexual behavior revealed a post-developmental role for FEZF1 in maintaining hypothalamic neuron identity and neuroendocrine function.\",\n      \"evidence\": \"Stereotaxic lentiviral shRNA injection into VMN of adult female mice, behavioral assays, ERα immunohistochemistry\",\n      \"pmids\": [\"29080672\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether FEZF1 directly regulates ERα transcription or acts indirectly unknown\", \"Single lab with shRNA approach; off-target effects not fully excluded\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"CRISPR knockout of FEZF1 in human ESCs blocked neural differentiation and impaired pluripotency exit, establishing that FEZF1 is necessary—but not sufficient—for early human neural specification, extending its requirement from mouse to human.\",\n      \"evidence\": \"CRISPR-Cas9 KO in H1 hESCs with chemical neural induction, FEZF1 overexpression control\",\n      \"pmids\": [\"29318501\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream targets in human neural specification not identified\", \"Single hESC line tested; generalizability across genetic backgrounds not shown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"ChIP evidence that FEZF1 binds Wnt pathway gene promoters and increases nuclear β-catenin in cervical cancer cells broadened its oncogenic transcriptional activator function to a third signaling pathway.\",\n      \"evidence\": \"ChIP assay in HeLa cells, FEZF1 RNAi and overexpression, Western blot for β-catenin, nude mouse xenograft\",\n      \"pmids\": [\"30410597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific Wnt target gene promoters bound by FEZF1 not individually validated\", \"Mechanism by which FEZF1 increases nuclear β-catenin not dissected\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identifying FEZF1 as a postmitotic fate switch in retinal starburst amacrine cells—promoting ON identity while directly repressing Rnd3 to suppress OFF identity and migration—demonstrated a cell-type-level binary switch mechanism beyond olfactory and cortical systems.\",\n      \"evidence\": \"Transcriptomic profiling of ON vs OFF SACs, Fezf1 conditional KO, gain-of-function, in situ hybridization\",\n      \"pmids\": [\"31812516\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FEZF1 directly binds the Rnd3 promoter not shown by ChIP\", \"Additional downstream targets mediating the ON gene program not fully mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The mechanism by which FEZF1 switches between transcriptional repressor (developmental contexts) and activator (cancer contexts) functions remains unresolved, as do the cofactors and chromatin states that determine this switch.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural data on FEZF1 protein or its zinc-finger/DNA complexes\", \"Genome-wide binding profiles (ChIP-seq) in developmental and cancer contexts lacking\", \"How FEZF1 mediates basal lamina penetration at the molecular effector level is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 6, 8, 9]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 5, 6, 7, 8, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 8, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0074160\", \"supporting_discovery_ids\": [0, 5, 6, 7, 8, 9]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 3, 5, 10]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [1, 3, 5, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 8, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"HES5\",\n      \"RND3\",\n      \"SP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}