{"gene":"FMNL2","run_date":"2026-06-09T23:54:44","timeline":{"discoveries":[{"year":2012,"finding":"FMNL2 is cotranslationally modified by N-terminal myristoylation, and this modification together with interaction with Cdc42 is required for proper subcellular targeting to lamellipodia and filopodia tips. In vitro, the C-terminal FH1-FH2 domain drives elongation (not nucleation) of actin filaments in the presence of profilin, and also captures and elongates filament ends generated by Arp2/3-mediated branching. RNAi-mediated silencing decreases lamellipodia protrusion rate and cell migration efficiency.","method":"In vitro actin polymerization assays with profilin, myristoylation mutants (G2A), Cdc42-binding mutants, RNAi knockdown with live-cell migration/protrusion rate measurements, subcellular localization by fluorescence microscopy","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro actin elongation assays combined with mutagenesis, live-cell imaging, and RNAi phenotyping in a single rigorous study","pmids":["22608513"],"is_preprint":false},{"year":2015,"finding":"Crystal structure of FMNL2 N-terminal domains (GBD/DID + armadillo repeats) in complex with active Cdc42 shows Cdc42 contacts all five armadillo repeats with specific interactions formed by the Rho-GTPase insert helix. Mutation of three residues in Rac1 creates a gain-of-function mutant that binds FMNL2 and reconstitutes the Cdc42 phenotype in vivo, demonstrating the structural basis of GTPase selectivity. FMNL1 dimerizes via a parallel coiled-coil to form an umbrella-shaped ~15 nm structure exposing six membrane interaction motifs.","method":"X-ray crystallography of FMNL1 and FMNL2 N-terminal domains with Cdc42; Rac1 gain-of-function mutagenesis validated in vivo","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus orthogonal mutagenesis validation in cells, rigorous single study","pmids":["25963737"],"is_preprint":false},{"year":2012,"finding":"N-terminal myristoylation of FMNL2 (at Gly2) is required for plasma membrane association and for FMNL2-induced cellular morphological changes. Replacement of Gly2 with Ala or pharmacological inhibition of N-myristoylation abolishes membrane localization and morphological effects.","method":"Site-directed mutagenesis (G2A), N-myristoylation inhibitor treatment, immunofluorescence localization in HEK293T cells","journal":"Bioscience, biotechnology, and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus pharmacological inhibition with localization readout, single lab two orthogonal approaches","pmids":["22790947"],"is_preprint":false},{"year":2017,"finding":"FMNL2 and FMNL3 localize to the Golgi apparatus in a manner requiring both N-terminal myristoylation and Cdc42 interaction. At the Golgi, they assemble a phalloidin-detectable actin meshwork. RNAi or CRISPR/Cas9 deletion of FMNL2/3 causes Golgi fragmentation, enlargement of endosomes, defective maturation/sorting into late endosomes/lysosomes, and impaired anterograde trafficking of VSV-G from Golgi to plasma membrane, placing FMNL2/3 downstream of Cdc42 in anterograde transport.","method":"RNAi, CRISPR/Cas9 gene deletion, fluorescence microscopy of Golgi markers, VSV-G trafficking assay, phalloidin staining for actin at Golgi","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent loss-of-function approaches (RNAi + CRISPR) with multiple orthogonal readouts (Golgi morphology, endosome size, VSV-G trafficking) replicated across cell lines","pmids":["28852060"],"is_preprint":false},{"year":2010,"finding":"FMNL2 is required for TGF-β-induced epithelial-mesenchymal transition (EMT) in colorectal carcinoma cells; FMNL2 knockdown prevents TGF-β-induced upregulation of vimentin/snail/slug and downregulation of E-cadherin, and blocks receptor-Smad3 phosphorylation responses. FMNL2 overexpression activates p-MAPK/p-MEK (but not p-PI3K/p-AKT), and MEK inhibitor U0126 abolishes this, placing FMNL2 upstream of the MAPK/MEK pathway in invasion.","method":"siRNA knockdown, forced overexpression, Western blot for EMT markers and signaling molecules, MEK inhibitor (U0126) and PI3K inhibitor (LY294002) treatment","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function plus gain-of-function with pharmacological pathway dissection, single lab","pmids":["21071512"],"is_preprint":false},{"year":2017,"finding":"FMNL2 directly interacts with COMMD10 and targets it for ubiquitin-mediated proteasomal degradation. COMMD10 normally binds the NF-κB p65 subunit and reduces its nuclear translocation, suppressing NF-κB-dependent invasion. FMNL2-mediated COMMD10 destabilization thus activates NF-κB signaling to promote colorectal cancer invasion and metastasis.","method":"Co-immunoprecipitation, GST pull-down, immunofluorescence, in vitro ubiquitination assay, dual-luciferase NF-κB reporter assay, nuclear protein extraction assay, Western blot","journal":"British journal of cancer","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Co-IP, GST pulldown, and in vitro ubiquitination assay provide orthogonal evidence for direct interaction and degradation mechanism, single lab but multiple methods","pmids":["28817833"],"is_preprint":false},{"year":2020,"finding":"FMNL2 directly binds dephosphorylated fascin in filopodia and controls fascin dynamics (phosphorylation state, localization, F-actin binding) within filopodia. Fascin phosphorylation, localization, and actin binding are dependent on FMNL2 activity as revealed by a fascin biosensor and advanced live-cell imaging.","method":"Direct binding assay between FMNL2 and fascin (dephosphorylated form), fascin phosphorylation biosensor, advanced live-cell structured illumination/STED microscopy, FMNL2 formin depletion experiments","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding demonstrated with biosensor and imaging, single lab with multiple complementary methods","pmids":["32294157"],"is_preprint":false},{"year":2018,"finding":"Cortactin directly binds FMNL2, and this interaction promotes actin polymerization and recycling endosome motility at invadopodia. EGF/Cdc42 stimulation enhances the cortactin–FMNL2 interaction and increases invadopodia number and matrix degradation. FMNL2 is required for invadopodia formation and function in colorectal cancer cells.","method":"Co-immunoprecipitation, GST pull-down, fluorescence microscopy, actin polymerization assays, matrix degradation assays (gelatin), in vivo metastasis models","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and GST pulldown establish direct binding; functional assays confirm role; single lab","pmids":["29374558"],"is_preprint":false},{"year":2018,"finding":"FMNL2 is required for the formation of epithelial cell-cell contacts via a Rac1-dependent but Cdc42-independent mechanism. CRISPR/Cas9 knockout of FMNL2 impairs intercellular contact establishment; optogenetic Rac1 activation recruits FMNL2 specifically to newly forming junctions, while Cdc42 silencing does not affect FMNL2-mediated contact formation. FMNL2 KO cells also show impaired filopodia formation similar to Cdc42 depletion.","method":"CRISPR/Cas9 knockout, optogenetic control of Rac1 activity, live-cell imaging of junction formation, siRNA silencing of Cdc42 vs Rac1","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO combined with optogenetics and live imaging, single lab with two orthogonal genetic approaches","pmids":["29579104"],"is_preprint":false},{"year":2022,"finding":"FMNL2 cooperates with the I-BAR domain protein IRTKS (but not IRSp53) to promote filopodia assembly. FMNL2 and IRTKS are mutually dependent cofactors: FMNL2's primary function in filopodia initiation is membrane bending to recruit IRTKS, with its FH2-mediated actin dynamics being secondary. IRTKS and IRSp53 were identified as FMNL2-binding proteins.","method":"Co-immunoprecipitation (FMNL2–IRTKS and FMNL2–IRSp53 interactions), coexpression filopodia assays, siRNA knockdown of IRTKS/IRSp53, dominant-negative FH2 domain analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP binding plus knockdown epistasis experiments with filopodia readout, single lab","pmids":["36259517"],"is_preprint":false},{"year":2023,"finding":"FMNL2-dependent filopodia formation requires serine 1072 phosphorylation within the DAD domain by PKCα. N-terminal myristoylation is required for FMNL2 tip localization in filopodia. PKCα localizes to the base of growing filopodia and PKC activity is required for filopodia formation, defining a PKCα–FMNL2 signaling module.","method":"Structured illumination microscopy, phospho-site mutagenesis (S1072A), PKC inhibitor treatments, PKCα localization imaging, FMNL2 myristoylation mutant (G2A)","journal":"Biomolecules","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis of phosphorylation site plus pharmacological inhibition and structured illumination microscopy, single lab","pmids":["36979484"],"is_preprint":false},{"year":2021,"finding":"A patient-derived heterozygous FMNL2 L136P mutation causes subcellular mislocalization and loss of autoinhibition (gain-of-function), impairing cell spreading and filopodia formation in fibroblasts, and disrupting podosome formation and matrix degradation in THP-1 macrophages.","method":"Expression of FMNL2 L136P mutant in fibroblasts and THP-1 macrophages, fluorescence microscopy of subcellular localization, cell spreading assay, filopodia quantification, podosome formation assay, matrix degradation assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional characterization of disease mutation with multiple cellular readouts in two cell types, single lab","pmids":["34043722"],"is_preprint":false},{"year":2024,"finding":"In mouse and porcine oocytes, FMNL2 localizes at the oocyte cortex and spindle periphery. FMNL2 depletion reduces cytoplasmic actin polymerization, prevents spindle migration to the cortex, causes polar body extrusion failure, and disrupts mitochondria and ER distribution (reduced mitochondrial membrane potential and ER stress). Mass spectrometry identified FMNL2 association with mitochondria- and ER-related proteins.","method":"siRNA depletion in mouse and porcine oocytes, live-cell imaging of spindle migration, actin polymerization measurement, immunofluorescence of organelle distribution, mitochondrial membrane potential assay, ER stress markers, mass spectrometry co-IP, mRNA rescue injection","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in two species (mouse and porcine) with rescue experiment and mass spectrometry interactome, single lab","pmids":["38747713"],"is_preprint":false},{"year":2020,"finding":"Caveolin-1 (CAV1) modulates epithelial collective cell migration by controlling cortical FMNL2 availability. CAV1 depletion increases cortical FMNL2 recruitment and impairs collective (but not individual) cell migration; simultaneous FMNL2 depletion rescues the collective migration defect caused by CAV1 knockdown.","method":"RNAi (CAV1 alone and double CAV1+FMNL2), live-cell imaging of collective migration, velocity correlation length analysis","journal":"Biology of the cell","confidence":"Low","confidence_rationale":"Tier 3 / Weak — epistatic RNAi rescue experiment provides pathway placement but no direct binding demonstrated, single lab single method","pmids":["33169848"],"is_preprint":false},{"year":2021,"finding":"Induced depletion of Arp2/3 complex (via conditional Actr3 knockout) reproducibly increases FMNL2 and FMNL3 formin expression, correlating with explosive induction of filopodia formation, indicating a compensatory upregulation of FMNL formins when branched actin nucleation is lost.","method":"Tamoxifen-inducible conditional Arp3 knockout mouse fibroblast cell lines, Western blot for FMNL2/3 expression, fluorescence microscopy of filopodia","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean conditional genetic KO with defined molecular readout, single lab, replicated across cell lines","pmids":["33598464"],"is_preprint":false},{"year":2025,"finding":"FMNL2 directly interacts with SRC kinase through the FMNL2-FH1 domain and SRC-SH3 domain. This interaction promotes AR (androgen receptor) translocation from cytoplasm to nucleus, increasing AR target gene expression and driving enzalutamide resistance in prostate cancer cells.","method":"Co-immunoprecipitation of FMNL2 and SRC, domain mapping (FH1 and SH3), nuclear/cytoplasmic fractionation of AR, FMNL2 knockdown in resistant cells, SRC inhibitor (dasatinib) treatment","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping and pharmacological validation, single lab","pmids":["40212590"],"is_preprint":false},{"year":2022,"finding":"Knockdown of fmnl2a in zebrafish prevents gliovascular remodeling (astroglial end-foot detachment from blood vessels), reduces microglial activity, and enhances amyloidosis, demonstrating that FMNL2 controls gliovascular interactions in vivo.","method":"Zebrafish fmnl2a morpholino knockdown, live imaging of gliovascular contacts, amyloid quantification, microglial activity assessment","journal":"Acta neuropathologica","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single knockdown approach in zebrafish model with morphological readout, single lab","pmids":["35608697"],"is_preprint":false},{"year":2024,"finding":"Proximity labeling (BioID) mass spectrometry identified an FMNL2 interactome including known (IRTKS) and novel interacting proteins related to filopodia, lamellipodia force generation, subcellular trafficking, cell-cell junction assembly, focal adhesion formation, and extracellular vesicle assembly. FMNL2 protein was directly detected in exosomes.","method":"BioID proximity labeling, quantitative mass spectrometry, exosome isolation and Western blot","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — proximity proteomics screen without validation of individual interactions by orthogonal methods","pmids":["38891874"],"is_preprint":false},{"year":2020,"finding":"TCP11L2 interacts with FMNL2 (co-immunoprecipitation) and promotes bovine muscle-derived satellite cell migration and differentiation; FMNL2 inhibition blocks TCP11L2-mediated migration and differentiation, placing FMNL2 downstream of TCP11L2 in this pathway.","method":"Co-immunoprecipitation, CRISPR/dCas9 overexpression and repression of TCP11L2, wound-healing migration assay, FMNL2 inhibition epistasis","journal":"Journal of cellular physiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP and functional epistasis in bovine satellite cells, single lab, non-human model with limited mechanistic resolution","pmids":["32017087"],"is_preprint":false},{"year":2022,"finding":"FMNL2 suppresses breast cancer cell migration and invasion by inhibiting the RhoA/LIMK/Cofilin pathway; FMNL2 silencing activates this pathway and promotes actin cytoskeleton rearrangement. Cytoplasmic p27 promotes FMNL2-mediated cell migration through the RhoA/LIMK/Cofilin pathway. ERα overexpression reduces FMNL2 protein levels via proteasomal degradation (reversed by MG132).","method":"siRNA knockdown, forced overexpression, Rho inhibitor (ZOL) and LIMK inhibitor (BMS3) treatment, Western blot for RhoA/LIMK/Cofilin pathway, MG132 proteasome inhibitor, in vivo xenograft assay","journal":"Cell death discovery","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacological pathway dissection without direct biochemical evidence for FMNL2–RhoA interaction, single lab","pmids":["35379791"],"is_preprint":false}],"current_model":"FMNL2 is a Diaphanous-related formin that is cotranslationally N-myristoylated and activated by Cdc42 binding (structural basis resolved by crystal structure), enabling its targeting to lamellipodia/filopodia tips and Golgi; at these sites it drives actin filament elongation (not nucleation) in cooperation with profilin, promotes filopodia assembly via IRTKS and fascin regulation with spatiotemporal control by PKCα-mediated S1072 phosphorylation, regulates anterograde Golgi trafficking and organelle distribution in oocyte meiosis, and in cancer contexts activates invasion through a cortactin interaction at invadopodia, COMMD10 ubiquitin-mediated degradation activating NF-κB, TGF-β/Smad3 and MAPK/MEK-dependent EMT, and SRC kinase-mediated androgen receptor nuclear translocation."},"narrative":{"mechanistic_narrative":"FMNL2 is a Diaphanous-related formin that drives actin filament elongation to power membrane protrusion, intracellular trafficking, and cell migration [PMID:22608513]. Its activity is gated by cotranslational N-terminal myristoylation at Gly2 and by binding to active Cdc42, both of which are required for membrane association and targeting to lamellipodia and filopodia tips; the FH1-FH2 domain elongates (rather than nucleates) actin filaments in the presence of profilin and captures Arp2/3-generated barbed ends [PMID:22608513, PMID:22790947]. The structural basis of GTPase selectivity is defined by Cdc42 contacting all five N-terminal armadillo repeats via its Rho-GTPase insert helix [PMID:25963737]. At filopodia, FMNL2 acts through coupled membrane-bending and actin mechanisms: it cooperates with the I-BAR protein IRTKS, where membrane bending to recruit IRTKS is its primary filopodial function [PMID:36259517], it binds and controls the phosphorylation state and localization of fascin [PMID:32294157], and its filopodial tip localization and activity require PKCα-mediated phosphorylation of Ser1072 in the DAD domain [PMID:36979484]. Beyond protrusion, FMNL2 builds a Golgi-associated actin meshwork downstream of Cdc42 to support Golgi integrity, endosome maturation, and anterograde VSV-G trafficking [PMID:28852060], mediates Rac1-dependent (Cdc42-independent) assembly of epithelial cell-cell contacts [PMID:29579104], and in oocytes localizes to the cortex and spindle periphery to drive cytoplasmic actin polymerization, spindle migration, and organelle distribution [PMID:38747713]. In cancer, FMNL2 promotes invasion through multiple effector arms: a direct cortactin interaction at invadopodia [PMID:29374558], TGF-β/Smad3 and MAPK/MEK-dependent EMT [PMID:21071512], degradation of COMMD10 to de-repress NF-κB [PMID:28817833], and an FH1-SH3 interaction with SRC that promotes androgen receptor nuclear translocation [PMID:40212590]. A patient-derived heterozygous L136P mutation causing loss of autoinhibition and mislocalization links FMNL2 dysfunction to impaired cell spreading, filopodia, and podosome formation [PMID:34043722].","teleology":[{"year":2012,"claim":"Established FMNL2 as an actin-elongating formin whose membrane targeting and activity depend on N-myristoylation and Cdc42, resolving how it contributes to protrusion and migration.","evidence":"In vitro actin polymerization with profilin, G2A and Cdc42-binding mutants, RNAi with live-cell migration imaging; plus mutagenesis/inhibitor localization in HEK293T","pmids":["22608513","22790947"],"confidence":"High","gaps":["Does not resolve how myristoylation and Cdc42 binding are coordinated temporally","In vivo elongation kinetics relative to other formins not defined"]},{"year":2015,"claim":"Defined the structural basis of FMNL2 GTPase selectivity, explaining why Cdc42 and not Rac1 activates it through the armadillo-repeat interface.","evidence":"X-ray crystallography of FMNL N-terminal domains with Cdc42 plus Rac1 gain-of-function mutagenesis validated in cells","pmids":["25963737"],"confidence":"High","gaps":["Full-length autoinhibited structure not resolved","Membrane-engaged conformation inferred from FMNL1 dimer, not directly shown for FMNL2"]},{"year":2010,"claim":"Placed FMNL2 in TGF-β-induced EMT and the MAPK/MEK invasion pathway in colorectal carcinoma, connecting the formin to a transcriptional invasion program.","evidence":"siRNA and overexpression with EMT marker and signaling Western blots, MEK and PI3K inhibitor treatments","pmids":["21071512"],"confidence":"Medium","gaps":["Direct molecular link between FMNL2 and MEK activation not established","Whether actin elongation activity is required for the signaling effect untested"]},{"year":2017,"claim":"Identified FMNL2 (with FMNL3) as a Cdc42 effector building Golgi-associated actin required for organelle integrity and anterograde trafficking, extending its role beyond the cell periphery.","evidence":"RNAi and CRISPR deletion with Golgi/endosome imaging, VSV-G trafficking assay, phalloidin staining across cell lines","pmids":["28852060"],"confidence":"High","gaps":["Cargo selectivity of the trafficking defect not defined","Functional redundancy boundaries between FMNL2 and FMNL3 unresolved"]},{"year":2017,"claim":"Revealed FMNL2 drives invasion non-cytoskeletally by degrading COMMD10 to activate NF-κB, a distinct effector arm from its actin function.","evidence":"Co-IP, GST pull-down, in vitro ubiquitination, NF-κB luciferase reporter, nuclear fractionation in colorectal cancer cells","pmids":["28817833"],"confidence":"High","gaps":["The E3 ligase recruited by FMNL2 to COMMD10 not identified","Whether FMNL2 acts catalytically or scaffolds degradation unclear"]},{"year":2018,"claim":"Resolved two parallel FMNL2 functions: a direct cortactin interaction driving invadopodia, and a Rac1-dependent role in cell-cell contact assembly distinct from its Cdc42-driven filopodia function.","evidence":"Reciprocal Co-IP/GST pull-down with invadopodia and matrix degradation assays; CRISPR KO with optogenetic Rac1 activation and Cdc42 vs Rac1 silencing","pmids":["29374558","29579104"],"confidence":"Medium","gaps":["How FMNL2 switches between Cdc42- and Rac1-dependent functions unknown","Recruitment mechanism to junctions versus invadopodia not distinguished"]},{"year":2020,"claim":"Showed FMNL2 directly binds dephosphorylated fascin and governs fascin dynamics within filopodia, integrating bundling control with elongation.","evidence":"Direct binding assay, fascin phosphorylation biosensor, SIM/STED live-cell imaging with formin depletion","pmids":["32294157"],"confidence":"Medium","gaps":["The kinase/phosphatase coupling fascin state to FMNL2 not identified","Stoichiometry of FMNL2-fascin at filopodial tips unmeasured"]},{"year":2022,"claim":"Reframed FMNL2's primary filopodial role as membrane bending to recruit IRTKS, with FH2 actin dynamics secondary, refining the protrusion-initiation model.","evidence":"Co-IP of FMNL2-IRTKS and FMNL2-IRSp53, coexpression filopodia assays, IRTKS/IRSp53 knockdown, dominant-negative FH2 analysis","pmids":["36259517"],"confidence":"Medium","gaps":["Biophysical demonstration of FMNL2 membrane-bending activity not provided","Selectivity for IRTKS over IRSp53 mechanism unexplained"]},{"year":2023,"claim":"Defined a PKCα-FMNL2 signaling module in which Ser1072 phosphorylation in the DAD domain licenses filopodia formation, adding kinase-level control to formin activation.","evidence":"SIM imaging, S1072A and G2A mutagenesis, PKC inhibitor treatments, PKCα localization at filopodial base","pmids":["36979484"],"confidence":"Medium","gaps":["Whether S1072 phosphorylation relieves autoinhibition directly not shown structurally","Crosstalk with Cdc42-mediated activation not mapped"]},{"year":2024,"claim":"Extended FMNL2 function to oocyte meiosis, where it drives cytoplasmic actin polymerization for spindle migration and organelle (mitochondria/ER) distribution.","evidence":"siRNA depletion in mouse and porcine oocytes with rescue, spindle migration imaging, organelle distribution and mitochondrial/ER stress assays, mass spectrometry interactome","pmids":["38747713"],"confidence":"Medium","gaps":["Direct mechanism linking FMNL2 to organelle positioning unresolved","Mass spectrometry associations not validated by orthogonal binding assays"]},{"year":2025,"claim":"Identified an FMNL2-FH1 / SRC-SH3 interaction promoting androgen receptor nuclear translocation and enzalutamide resistance, a further non-cytoskeletal cancer effector arm.","evidence":"Co-IP with FH1/SH3 domain mapping, AR nuclear/cytoplasmic fractionation, knockdown in resistant cells, dasatinib treatment","pmids":["40212590"],"confidence":"Medium","gaps":["Whether SRC kinase activity toward AR or FMNL2 itself is required unclear","In vivo relevance to resistant prostate tumors not established"]},{"year":2021,"claim":"Connected FMNL2 dysfunction to human disease through a patient-derived L136P autoinhibition-loss mutation impairing spreading, filopodia, and podosomes.","evidence":"Expression of L136P mutant in fibroblasts and THP-1 macrophages with localization, spreading, filopodia, podosome and matrix degradation assays","pmids":["34043722"],"confidence":"Medium","gaps":["The specific clinical phenotype/disease entity not detailed in mechanism terms","Whether gain-of-function effect is dominant in vivo untested"]},{"year":null,"claim":"How FMNL2's distinct effector arms — actin elongation, membrane bending, COMMD10/NF-κB degradation, SRC/AR translocation — are selected and coordinated within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unified model linking upstream GTPase/kinase inputs to choice of effector output","Whether cytoskeletal and signaling functions are mutually exclusive or simultaneous unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,9,10]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,3]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,6]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[3]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,4,5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[8]}],"complexes":[],"partners":["CDC42","RAC1","IRTKS","FSCN1","CTTN","COMMD10","SRC","FMNL3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96PY5","full_name":"Formin-like protein 2","aliases":["Formin homology 2 domain-containing protein 2"],"length_aa":1086,"mass_kda":123.3,"function":"Plays a role in the regulation of cell morphology and cytoskeletal organization. Required in the cortical actin filament dynamics","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q96PY5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FMNL2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ACTG1","stoichiometry":0.2},{"gene":"PFN1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/FMNL2","total_profiled":1310},"omim":[{"mim_id":"619889","title":"T-COMPLEX PROTEIN 11-LIKE 2; TCP11L2","url":"https://www.omim.org/entry/619889"},{"mim_id":"616890","title":"SPLIT-FOOT MALFORMATION WITH MESOAXIAL POLYDACTYLY; SFMMP","url":"https://www.omim.org/entry/616890"},{"mim_id":"616288","title":"FORMIN-LIKE 3; FMNL3","url":"https://www.omim.org/entry/616288"},{"mim_id":"616285","title":"FORMIN-LIKE 2; FMNL2","url":"https://www.omim.org/entry/616285"},{"mim_id":"609479","title":"MITOGEN-ACTIVATED PROTEIN KINASE KINASE KINASE 20; MAP3K20","url":"https://www.omim.org/entry/609479"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":214.1}],"url":"https://www.proteinatlas.org/search/FMNL2"},"hgnc":{"alias_symbol":["KIAA1902"],"prev_symbol":["FHOD2"]},"alphafold":{"accession":"Q96PY5","domains":[{"cath_id":"-","chopping":"75-152_205-245","consensus_level":"medium","plddt":91.3089,"start":75,"end":245},{"cath_id":"1.25.10.10","chopping":"253-377","consensus_level":"medium","plddt":93.2758,"start":253,"end":377},{"cath_id":"-","chopping":"697-776","consensus_level":"high","plddt":90.4623,"start":697,"end":776},{"cath_id":"1.20.58.2220","chopping":"818-885_967-1006","consensus_level":"medium","plddt":90.8987,"start":818,"end":1006},{"cath_id":"1.10.20","chopping":"33-70","consensus_level":"high","plddt":85.8134,"start":33,"end":70},{"cath_id":"1.10.287","chopping":"798-816_893-965","consensus_level":"medium","plddt":94.1593,"start":798,"end":965}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PY5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PY5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PY5-F1-predicted_aligned_error_v6.png","plddt_mean":76.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FMNL2","jax_strain_url":"https://www.jax.org/strain/search?query=FMNL2"},"sequence":{"accession":"Q96PY5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96PY5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96PY5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PY5"}},"corpus_meta":[{"pmid":"22608513","id":"PMC_22608513","title":"FMNL2 drives actin-based protrusion and migration downstream of Cdc42.","date":"2012","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/22608513","citation_count":172,"is_preprint":false},{"pmid":"12684686","id":"PMC_12684686","title":"Identification and characterization of human FMNL1, FMNL2 and FMNL3 genes in silico.","date":"2003","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/12684686","citation_count":128,"is_preprint":false},{"pmid":"23201162","id":"PMC_23201162","title":"MicroRNA-137, an HMGA1 target, suppresses colorectal cancer cell invasion and metastasis in mice by directly targeting FMNL2.","date":"2012","source":"Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/23201162","citation_count":117,"is_preprint":false},{"pmid":"18665374","id":"PMC_18665374","title":"Overexpression of FMNL2 is closely related to metastasis of colorectal cancer.","date":"2008","source":"International journal of colorectal 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reticulum and mitochondria distribution in oocyte meiosis.","date":"2024","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/38747713","citation_count":13,"is_preprint":false},{"pmid":"35646112","id":"PMC_35646112","title":"circRNA TCFL5 Promote Esophageal Cancer Progression by Modulating M2 Macrophage Polarization via the miR-543-FMNL2 Axis.","date":"2022","source":"Journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/35646112","citation_count":13,"is_preprint":false},{"pmid":"36259517","id":"PMC_36259517","title":"Cooperative assembly of filopodia by the formin FMNL2 and I-BAR domain protein IRTKS.","date":"2022","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36259517","citation_count":12,"is_preprint":false},{"pmid":"31298385","id":"PMC_31298385","title":"MicroRNA-22 targets FMNL2 to inhibit melanoma progression via the regulation of the Wnt/β-catenin signaling pathway and epithelial-mesenchymal 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In vitro, the C-terminal FH1-FH2 domain drives elongation (not nucleation) of actin filaments in the presence of profilin, and also captures and elongates filament ends generated by Arp2/3-mediated branching. RNAi-mediated silencing decreases lamellipodia protrusion rate and cell migration efficiency.\",\n      \"method\": \"In vitro actin polymerization assays with profilin, myristoylation mutants (G2A), Cdc42-binding mutants, RNAi knockdown with live-cell migration/protrusion rate measurements, subcellular localization by fluorescence microscopy\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro actin elongation assays combined with mutagenesis, live-cell imaging, and RNAi phenotyping in a single rigorous study\",\n      \"pmids\": [\"22608513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structure of FMNL2 N-terminal domains (GBD/DID + armadillo repeats) in complex with active Cdc42 shows Cdc42 contacts all five armadillo repeats with specific interactions formed by the Rho-GTPase insert helix. Mutation of three residues in Rac1 creates a gain-of-function mutant that binds FMNL2 and reconstitutes the Cdc42 phenotype in vivo, demonstrating the structural basis of GTPase selectivity. FMNL1 dimerizes via a parallel coiled-coil to form an umbrella-shaped ~15 nm structure exposing six membrane interaction motifs.\",\n      \"method\": \"X-ray crystallography of FMNL1 and FMNL2 N-terminal domains with Cdc42; Rac1 gain-of-function mutagenesis validated in vivo\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus orthogonal mutagenesis validation in cells, rigorous single study\",\n      \"pmids\": [\"25963737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"N-terminal myristoylation of FMNL2 (at Gly2) is required for plasma membrane association and for FMNL2-induced cellular morphological changes. Replacement of Gly2 with Ala or pharmacological inhibition of N-myristoylation abolishes membrane localization and morphological effects.\",\n      \"method\": \"Site-directed mutagenesis (G2A), N-myristoylation inhibitor treatment, immunofluorescence localization in HEK293T cells\",\n      \"journal\": \"Bioscience, biotechnology, and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus pharmacological inhibition with localization readout, single lab two orthogonal approaches\",\n      \"pmids\": [\"22790947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FMNL2 and FMNL3 localize to the Golgi apparatus in a manner requiring both N-terminal myristoylation and Cdc42 interaction. At the Golgi, they assemble a phalloidin-detectable actin meshwork. RNAi or CRISPR/Cas9 deletion of FMNL2/3 causes Golgi fragmentation, enlargement of endosomes, defective maturation/sorting into late endosomes/lysosomes, and impaired anterograde trafficking of VSV-G from Golgi to plasma membrane, placing FMNL2/3 downstream of Cdc42 in anterograde transport.\",\n      \"method\": \"RNAi, CRISPR/Cas9 gene deletion, fluorescence microscopy of Golgi markers, VSV-G trafficking assay, phalloidin staining for actin at Golgi\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent loss-of-function approaches (RNAi + CRISPR) with multiple orthogonal readouts (Golgi morphology, endosome size, VSV-G trafficking) replicated across cell lines\",\n      \"pmids\": [\"28852060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FMNL2 is required for TGF-β-induced epithelial-mesenchymal transition (EMT) in colorectal carcinoma cells; FMNL2 knockdown prevents TGF-β-induced upregulation of vimentin/snail/slug and downregulation of E-cadherin, and blocks receptor-Smad3 phosphorylation responses. FMNL2 overexpression activates p-MAPK/p-MEK (but not p-PI3K/p-AKT), and MEK inhibitor U0126 abolishes this, placing FMNL2 upstream of the MAPK/MEK pathway in invasion.\",\n      \"method\": \"siRNA knockdown, forced overexpression, Western blot for EMT markers and signaling molecules, MEK inhibitor (U0126) and PI3K inhibitor (LY294002) treatment\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function plus gain-of-function with pharmacological pathway dissection, single lab\",\n      \"pmids\": [\"21071512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FMNL2 directly interacts with COMMD10 and targets it for ubiquitin-mediated proteasomal degradation. COMMD10 normally binds the NF-κB p65 subunit and reduces its nuclear translocation, suppressing NF-κB-dependent invasion. FMNL2-mediated COMMD10 destabilization thus activates NF-κB signaling to promote colorectal cancer invasion and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, immunofluorescence, in vitro ubiquitination assay, dual-luciferase NF-κB reporter assay, nuclear protein extraction assay, Western blot\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP, GST pulldown, and in vitro ubiquitination assay provide orthogonal evidence for direct interaction and degradation mechanism, single lab but multiple methods\",\n      \"pmids\": [\"28817833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FMNL2 directly binds dephosphorylated fascin in filopodia and controls fascin dynamics (phosphorylation state, localization, F-actin binding) within filopodia. Fascin phosphorylation, localization, and actin binding are dependent on FMNL2 activity as revealed by a fascin biosensor and advanced live-cell imaging.\",\n      \"method\": \"Direct binding assay between FMNL2 and fascin (dephosphorylated form), fascin phosphorylation biosensor, advanced live-cell structured illumination/STED microscopy, FMNL2 formin depletion experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding demonstrated with biosensor and imaging, single lab with multiple complementary methods\",\n      \"pmids\": [\"32294157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cortactin directly binds FMNL2, and this interaction promotes actin polymerization and recycling endosome motility at invadopodia. EGF/Cdc42 stimulation enhances the cortactin–FMNL2 interaction and increases invadopodia number and matrix degradation. FMNL2 is required for invadopodia formation and function in colorectal cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, fluorescence microscopy, actin polymerization assays, matrix degradation assays (gelatin), in vivo metastasis models\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and GST pulldown establish direct binding; functional assays confirm role; single lab\",\n      \"pmids\": [\"29374558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FMNL2 is required for the formation of epithelial cell-cell contacts via a Rac1-dependent but Cdc42-independent mechanism. CRISPR/Cas9 knockout of FMNL2 impairs intercellular contact establishment; optogenetic Rac1 activation recruits FMNL2 specifically to newly forming junctions, while Cdc42 silencing does not affect FMNL2-mediated contact formation. FMNL2 KO cells also show impaired filopodia formation similar to Cdc42 depletion.\",\n      \"method\": \"CRISPR/Cas9 knockout, optogenetic control of Rac1 activity, live-cell imaging of junction formation, siRNA silencing of Cdc42 vs Rac1\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO combined with optogenetics and live imaging, single lab with two orthogonal genetic approaches\",\n      \"pmids\": [\"29579104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FMNL2 cooperates with the I-BAR domain protein IRTKS (but not IRSp53) to promote filopodia assembly. FMNL2 and IRTKS are mutually dependent cofactors: FMNL2's primary function in filopodia initiation is membrane bending to recruit IRTKS, with its FH2-mediated actin dynamics being secondary. IRTKS and IRSp53 were identified as FMNL2-binding proteins.\",\n      \"method\": \"Co-immunoprecipitation (FMNL2–IRTKS and FMNL2–IRSp53 interactions), coexpression filopodia assays, siRNA knockdown of IRTKS/IRSp53, dominant-negative FH2 domain analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP binding plus knockdown epistasis experiments with filopodia readout, single lab\",\n      \"pmids\": [\"36259517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FMNL2-dependent filopodia formation requires serine 1072 phosphorylation within the DAD domain by PKCα. N-terminal myristoylation is required for FMNL2 tip localization in filopodia. PKCα localizes to the base of growing filopodia and PKC activity is required for filopodia formation, defining a PKCα–FMNL2 signaling module.\",\n      \"method\": \"Structured illumination microscopy, phospho-site mutagenesis (S1072A), PKC inhibitor treatments, PKCα localization imaging, FMNL2 myristoylation mutant (G2A)\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis of phosphorylation site plus pharmacological inhibition and structured illumination microscopy, single lab\",\n      \"pmids\": [\"36979484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A patient-derived heterozygous FMNL2 L136P mutation causes subcellular mislocalization and loss of autoinhibition (gain-of-function), impairing cell spreading and filopodia formation in fibroblasts, and disrupting podosome formation and matrix degradation in THP-1 macrophages.\",\n      \"method\": \"Expression of FMNL2 L136P mutant in fibroblasts and THP-1 macrophages, fluorescence microscopy of subcellular localization, cell spreading assay, filopodia quantification, podosome formation assay, matrix degradation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional characterization of disease mutation with multiple cellular readouts in two cell types, single lab\",\n      \"pmids\": [\"34043722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In mouse and porcine oocytes, FMNL2 localizes at the oocyte cortex and spindle periphery. FMNL2 depletion reduces cytoplasmic actin polymerization, prevents spindle migration to the cortex, causes polar body extrusion failure, and disrupts mitochondria and ER distribution (reduced mitochondrial membrane potential and ER stress). Mass spectrometry identified FMNL2 association with mitochondria- and ER-related proteins.\",\n      \"method\": \"siRNA depletion in mouse and porcine oocytes, live-cell imaging of spindle migration, actin polymerization measurement, immunofluorescence of organelle distribution, mitochondrial membrane potential assay, ER stress markers, mass spectrometry co-IP, mRNA rescue injection\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in two species (mouse and porcine) with rescue experiment and mass spectrometry interactome, single lab\",\n      \"pmids\": [\"38747713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Caveolin-1 (CAV1) modulates epithelial collective cell migration by controlling cortical FMNL2 availability. CAV1 depletion increases cortical FMNL2 recruitment and impairs collective (but not individual) cell migration; simultaneous FMNL2 depletion rescues the collective migration defect caused by CAV1 knockdown.\",\n      \"method\": \"RNAi (CAV1 alone and double CAV1+FMNL2), live-cell imaging of collective migration, velocity correlation length analysis\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — epistatic RNAi rescue experiment provides pathway placement but no direct binding demonstrated, single lab single method\",\n      \"pmids\": [\"33169848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Induced depletion of Arp2/3 complex (via conditional Actr3 knockout) reproducibly increases FMNL2 and FMNL3 formin expression, correlating with explosive induction of filopodia formation, indicating a compensatory upregulation of FMNL formins when branched actin nucleation is lost.\",\n      \"method\": \"Tamoxifen-inducible conditional Arp3 knockout mouse fibroblast cell lines, Western blot for FMNL2/3 expression, fluorescence microscopy of filopodia\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional genetic KO with defined molecular readout, single lab, replicated across cell lines\",\n      \"pmids\": [\"33598464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FMNL2 directly interacts with SRC kinase through the FMNL2-FH1 domain and SRC-SH3 domain. This interaction promotes AR (androgen receptor) translocation from cytoplasm to nucleus, increasing AR target gene expression and driving enzalutamide resistance in prostate cancer cells.\",\n      \"method\": \"Co-immunoprecipitation of FMNL2 and SRC, domain mapping (FH1 and SH3), nuclear/cytoplasmic fractionation of AR, FMNL2 knockdown in resistant cells, SRC inhibitor (dasatinib) treatment\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping and pharmacological validation, single lab\",\n      \"pmids\": [\"40212590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Knockdown of fmnl2a in zebrafish prevents gliovascular remodeling (astroglial end-foot detachment from blood vessels), reduces microglial activity, and enhances amyloidosis, demonstrating that FMNL2 controls gliovascular interactions in vivo.\",\n      \"method\": \"Zebrafish fmnl2a morpholino knockdown, live imaging of gliovascular contacts, amyloid quantification, microglial activity assessment\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single knockdown approach in zebrafish model with morphological readout, single lab\",\n      \"pmids\": [\"35608697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Proximity labeling (BioID) mass spectrometry identified an FMNL2 interactome including known (IRTKS) and novel interacting proteins related to filopodia, lamellipodia force generation, subcellular trafficking, cell-cell junction assembly, focal adhesion formation, and extracellular vesicle assembly. FMNL2 protein was directly detected in exosomes.\",\n      \"method\": \"BioID proximity labeling, quantitative mass spectrometry, exosome isolation and Western blot\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — proximity proteomics screen without validation of individual interactions by orthogonal methods\",\n      \"pmids\": [\"38891874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TCP11L2 interacts with FMNL2 (co-immunoprecipitation) and promotes bovine muscle-derived satellite cell migration and differentiation; FMNL2 inhibition blocks TCP11L2-mediated migration and differentiation, placing FMNL2 downstream of TCP11L2 in this pathway.\",\n      \"method\": \"Co-immunoprecipitation, CRISPR/dCas9 overexpression and repression of TCP11L2, wound-healing migration assay, FMNL2 inhibition epistasis\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP and functional epistasis in bovine satellite cells, single lab, non-human model with limited mechanistic resolution\",\n      \"pmids\": [\"32017087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FMNL2 suppresses breast cancer cell migration and invasion by inhibiting the RhoA/LIMK/Cofilin pathway; FMNL2 silencing activates this pathway and promotes actin cytoskeleton rearrangement. Cytoplasmic p27 promotes FMNL2-mediated cell migration through the RhoA/LIMK/Cofilin pathway. ERα overexpression reduces FMNL2 protein levels via proteasomal degradation (reversed by MG132).\",\n      \"method\": \"siRNA knockdown, forced overexpression, Rho inhibitor (ZOL) and LIMK inhibitor (BMS3) treatment, Western blot for RhoA/LIMK/Cofilin pathway, MG132 proteasome inhibitor, in vivo xenograft assay\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacological pathway dissection without direct biochemical evidence for FMNL2–RhoA interaction, single lab\",\n      \"pmids\": [\"35379791\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FMNL2 is a Diaphanous-related formin that is cotranslationally N-myristoylated and activated by Cdc42 binding (structural basis resolved by crystal structure), enabling its targeting to lamellipodia/filopodia tips and Golgi; at these sites it drives actin filament elongation (not nucleation) in cooperation with profilin, promotes filopodia assembly via IRTKS and fascin regulation with spatiotemporal control by PKCα-mediated S1072 phosphorylation, regulates anterograde Golgi trafficking and organelle distribution in oocyte meiosis, and in cancer contexts activates invasion through a cortactin interaction at invadopodia, COMMD10 ubiquitin-mediated degradation activating NF-κB, TGF-β/Smad3 and MAPK/MEK-dependent EMT, and SRC kinase-mediated androgen receptor nuclear translocation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FMNL2 is a Diaphanous-related formin that drives actin filament elongation to power membrane protrusion, intracellular trafficking, and cell migration [#0]. Its activity is gated by cotranslational N-terminal myristoylation at Gly2 and by binding to active Cdc42, both of which are required for membrane association and targeting to lamellipodia and filopodia tips; the FH1-FH2 domain elongates (rather than nucleates) actin filaments in the presence of profilin and captures Arp2/3-generated barbed ends [#0, #2]. The structural basis of GTPase selectivity is defined by Cdc42 contacting all five N-terminal armadillo repeats via its Rho-GTPase insert helix [#1]. At filopodia, FMNL2 acts through coupled membrane-bending and actin mechanisms: it cooperates with the I-BAR protein IRTKS, where membrane bending to recruit IRTKS is its primary filopodial function [#9], it binds and controls the phosphorylation state and localization of fascin [#6], and its filopodial tip localization and activity require PKC\\u03b1-mediated phosphorylation of Ser1072 in the DAD domain [#10]. Beyond protrusion, FMNL2 builds a Golgi-associated actin meshwork downstream of Cdc42 to support Golgi integrity, endosome maturation, and anterograde VSV-G trafficking [#3], mediates Rac1-dependent (Cdc42-independent) assembly of epithelial cell-cell contacts [#8], and in oocytes localizes to the cortex and spindle periphery to drive cytoplasmic actin polymerization, spindle migration, and organelle distribution [#12]. In cancer, FMNL2 promotes invasion through multiple effector arms: a direct cortactin interaction at invadopodia [#7], TGF-\\u03b2/Smad3 and MAPK/MEK-dependent EMT [#4], degradation of COMMD10 to de-repress NF-\\u03baB [#5], and an FH1-SH3 interaction with SRC that promotes androgen receptor nuclear translocation [#15]. A patient-derived heterozygous L136P mutation causing loss of autoinhibition and mislocalization links FMNL2 dysfunction to impaired cell spreading, filopodia, and podosome formation [#11].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established FMNL2 as an actin-elongating formin whose membrane targeting and activity depend on N-myristoylation and Cdc42, resolving how it contributes to protrusion and migration.\",\n      \"evidence\": \"In vitro actin polymerization with profilin, G2A and Cdc42-binding mutants, RNAi with live-cell migration imaging; plus mutagenesis/inhibitor localization in HEK293T\",\n      \"pmids\": [\"22608513\", \"22790947\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve how myristoylation and Cdc42 binding are coordinated temporally\", \"In vivo elongation kinetics relative to other formins not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the structural basis of FMNL2 GTPase selectivity, explaining why Cdc42 and not Rac1 activates it through the armadillo-repeat interface.\",\n      \"evidence\": \"X-ray crystallography of FMNL N-terminal domains with Cdc42 plus Rac1 gain-of-function mutagenesis validated in cells\",\n      \"pmids\": [\"25963737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length autoinhibited structure not resolved\", \"Membrane-engaged conformation inferred from FMNL1 dimer, not directly shown for FMNL2\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed FMNL2 in TGF-\\u03b2-induced EMT and the MAPK/MEK invasion pathway in colorectal carcinoma, connecting the formin to a transcriptional invasion program.\",\n      \"evidence\": \"siRNA and overexpression with EMT marker and signaling Western blots, MEK and PI3K inhibitor treatments\",\n      \"pmids\": [\"21071512\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between FMNL2 and MEK activation not established\", \"Whether actin elongation activity is required for the signaling effect untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified FMNL2 (with FMNL3) as a Cdc42 effector building Golgi-associated actin required for organelle integrity and anterograde trafficking, extending its role beyond the cell periphery.\",\n      \"evidence\": \"RNAi and CRISPR deletion with Golgi/endosome imaging, VSV-G trafficking assay, phalloidin staining across cell lines\",\n      \"pmids\": [\"28852060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo selectivity of the trafficking defect not defined\", \"Functional redundancy boundaries between FMNL2 and FMNL3 unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed FMNL2 drives invasion non-cytoskeletally by degrading COMMD10 to activate NF-\\u03baB, a distinct effector arm from its actin function.\",\n      \"evidence\": \"Co-IP, GST pull-down, in vitro ubiquitination, NF-\\u03baB luciferase reporter, nuclear fractionation in colorectal cancer cells\",\n      \"pmids\": [\"28817833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The E3 ligase recruited by FMNL2 to COMMD10 not identified\", \"Whether FMNL2 acts catalytically or scaffolds degradation unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved two parallel FMNL2 functions: a direct cortactin interaction driving invadopodia, and a Rac1-dependent role in cell-cell contact assembly distinct from its Cdc42-driven filopodia function.\",\n      \"evidence\": \"Reciprocal Co-IP/GST pull-down with invadopodia and matrix degradation assays; CRISPR KO with optogenetic Rac1 activation and Cdc42 vs Rac1 silencing\",\n      \"pmids\": [\"29374558\", \"29579104\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How FMNL2 switches between Cdc42- and Rac1-dependent functions unknown\", \"Recruitment mechanism to junctions versus invadopodia not distinguished\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed FMNL2 directly binds dephosphorylated fascin and governs fascin dynamics within filopodia, integrating bundling control with elongation.\",\n      \"evidence\": \"Direct binding assay, fascin phosphorylation biosensor, SIM/STED live-cell imaging with formin depletion\",\n      \"pmids\": [\"32294157\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The kinase/phosphatase coupling fascin state to FMNL2 not identified\", \"Stoichiometry of FMNL2-fascin at filopodial tips unmeasured\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Reframed FMNL2's primary filopodial role as membrane bending to recruit IRTKS, with FH2 actin dynamics secondary, refining the protrusion-initiation model.\",\n      \"evidence\": \"Co-IP of FMNL2-IRTKS and FMNL2-IRSp53, coexpression filopodia assays, IRTKS/IRSp53 knockdown, dominant-negative FH2 analysis\",\n      \"pmids\": [\"36259517\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biophysical demonstration of FMNL2 membrane-bending activity not provided\", \"Selectivity for IRTKS over IRSp53 mechanism unexplained\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a PKC\\u03b1-FMNL2 signaling module in which Ser1072 phosphorylation in the DAD domain licenses filopodia formation, adding kinase-level control to formin activation.\",\n      \"evidence\": \"SIM imaging, S1072A and G2A mutagenesis, PKC inhibitor treatments, PKC\\u03b1 localization at filopodial base\",\n      \"pmids\": [\"36979484\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether S1072 phosphorylation relieves autoinhibition directly not shown structurally\", \"Crosstalk with Cdc42-mediated activation not mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended FMNL2 function to oocyte meiosis, where it drives cytoplasmic actin polymerization for spindle migration and organelle (mitochondria/ER) distribution.\",\n      \"evidence\": \"siRNA depletion in mouse and porcine oocytes with rescue, spindle migration imaging, organelle distribution and mitochondrial/ER stress assays, mass spectrometry interactome\",\n      \"pmids\": [\"38747713\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism linking FMNL2 to organelle positioning unresolved\", \"Mass spectrometry associations not validated by orthogonal binding assays\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified an FMNL2-FH1 / SRC-SH3 interaction promoting androgen receptor nuclear translocation and enzalutamide resistance, a further non-cytoskeletal cancer effector arm.\",\n      \"evidence\": \"Co-IP with FH1/SH3 domain mapping, AR nuclear/cytoplasmic fractionation, knockdown in resistant cells, dasatinib treatment\",\n      \"pmids\": [\"40212590\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SRC kinase activity toward AR or FMNL2 itself is required unclear\", \"In vivo relevance to resistant prostate tumors not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected FMNL2 dysfunction to human disease through a patient-derived L136P autoinhibition-loss mutation impairing spreading, filopodia, and podosomes.\",\n      \"evidence\": \"Expression of L136P mutant in fibroblasts and THP-1 macrophages with localization, spreading, filopodia, podosome and matrix degradation assays\",\n      \"pmids\": [\"34043722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The specific clinical phenotype/disease entity not detailed in mechanism terms\", \"Whether gain-of-function effect is dominant in vivo untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How FMNL2's distinct effector arms — actin elongation, membrane bending, COMMD10/NF-\\u03baB degradation, SRC/AR translocation — are selected and coordinated within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model linking upstream GTPase/kinase inputs to choice of effector output\", \"Whether cytoskeletal and signaling functions are mutually exclusive or simultaneous unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 9, 10]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 4, 5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CDC42\", \"RAC1\", \"IRTKS\", \"FSCN1\", \"CTTN\", \"COMMD10\", \"SRC\", \"FMNL3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}