{"gene":"PLS3","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2022,"finding":"Cryo-EM structural analysis revealed that T-plastin bridges pairs of actin filaments in both parallel and antiparallel orientations through a sequential bundling mechanism, populating distinct structural landscapes in each orientation. Inter-CHD linkers were identified as key structural elements enabling flexible but stable cross-linking.","method":"Cryo-electron microscopy with machine-learning-enabled pipeline, biochemical assays, cell biological experiments, mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure combined with biochemical and cell biological validation in a single rigorous study","pmids":["36067297"],"is_preprint":false},{"year":1995,"finding":"T-plastin is functionally required for Shigella flexneri entry into HeLa cells. T-plastin co-localizes with parallel actin filament bundles in parasite-induced cellular protrusions, and expression of a truncated T-plastin lacking one actin-binding site inhibits bacterial entry, demonstrating a direct functional role in actin bundle architecture during invasion.","method":"Transfection of truncated T-plastin dominant-negative construct, immunofluorescence co-localization, electron microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function via dominant-negative with defined phenotype, co-localization, replicated across multiple experimental approaches","pmids":["7721941"],"is_preprint":false},{"year":1994,"finding":"T-plastin and L-plastin isoforms play distinct, cell-type-specific roles in actin filament organization. In LLC-PK1 epithelial cells, T-plastin induces shape changes in microvilli and remains associated with microvillar actin filaments after detergent extraction, while L-plastin has no effect on microvilli. In CV-1 fibroblast-like cells, overproduction of both isoforms induces cell rounding and reorganization of actin stress fibers, but T-plastin is largely extracted by non-ionic detergent while L-plastin remains associated with microfilaments.","method":"Overexpression in CV-1 and LLC-PK1 cell lines, non-ionic detergent extraction, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (overexpression, detergent extraction, imaging) across two cell lines establishing isoform-specific functions","pmids":["7806577"],"is_preprint":false},{"year":2005,"finding":"T-plastin increases the velocity of Arp2/3-mediated actin-based bead movement by ~1.5-fold, stabilizes actin comets, displaces cofilin, and inhibits cofilin-mediated actin filament depolymerization in vitro. A bundling-incompetent variant comprising only ABD1 had similar stabilizing effects, indicating that T-plastin controls actin turnover via filament binding independently of cross-link/bundle formation.","method":"Quantitative biomimetic motility assay (VCA-coated beads in cell-free extracts), in vitro depolymerization assay, cell-based overexpression of ABD1 fragment","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution assay plus mutagenesis (truncation variant) plus cell-based validation, single lab but multiple orthogonal methods","pmids":["15741236"],"is_preprint":false},{"year":2016,"finding":"PLS3 overexpression restores endocytosis in SMN-deficient cells and neuromuscular junctions. CORO1C was identified as a direct binding partner of PLS3, with their interaction being calcium-dependent. Both PLS3 and CORO1C overexpression elevate F-actin levels and rescue endocytosis defects and axonal truncation in Smn-depleted zebrafish, placing PLS3 in an endocytic pathway downstream of SMN.","method":"Proteomics, biochemical interaction assays, FM1-43 endocytosis assay in NMJs, SMN-knockdown zebrafish rescue experiments, PLS3 overexpression in SMA mouse model","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (proteomics, direct binding, electrophysiology, in vivo rescue), replicated across cell and animal models","pmids":["27499521"],"is_preprint":false},{"year":2020,"finding":"T-plastin promotes membrane protrusions and enables cells to bridge ECM gaps during migration. T-plastin is specifically enriched in active protrusions where F-actin is devoid of non-muscle myosin II activity, and it widens and lengthens protrusions to stabilize actin filaments.","method":"Micropatterned ECM substrates, live-cell imaging, T-plastin knockdown/knockout, co-localization with myosin II markers","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with defined cellular phenotype on engineered substrates, multiple imaging approaches establishing localization-function link","pmids":["32968060"],"is_preprint":false},{"year":2017,"finding":"T-plastin (Pls3) localizes to the cell cortex and is essential for the localization and activation of myosin II in mouse epidermal cells. In utero depletion of Pls3 caused basement membrane and polarity defects in the epidermis; apicobasal polarity defects were secondary to basement membrane disruption. Inhibition of myosin II motor activity similarly disrupted basement membrane organization.","method":"In utero siRNA depletion in mouse embryos, immunofluorescence, myosin II inhibition","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo loss-of-function with defined phenotype, epistasis established (polarity defects secondary to BM defects), multiple functional readouts","pmids":["28559444"],"is_preprint":false},{"year":2011,"finding":"T-plastin (and L-plastin) interacts specifically with activated (GTP-bound) Rab5, co-localizes with Rab5 on the plasma membrane and endosomes, and overexpression of T-plastin increases Rab5 activity and the rate of fluid-phase endocytosis in Cos-1 cells.","method":"Affinity column pulldown with constitutively active Rab5, co-localization by fluorescence microscopy, fluid-phase endocytosis assay, overexpression","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pulldown and co-localization with functional endocytosis readout, single lab, multiple methods","pmids":["21426900"],"is_preprint":false},{"year":2017,"finding":"T-plastin expression is regulated downstream of the calcineurin/NFAT signaling pathway in keratinocytes. Knockdown of NFAT2 or T-plastin, or treatment with calcineurin inhibitor FK506, reduces T-plastin expression and impairs keratinocyte migration, lamellipodia formation, and FAK and β6-integrin expression.","method":"siRNA knockdown, FK506 treatment, scratch and Boyden migration assays, immunofluorescence","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway placement by genetic (siRNA) and pharmacological epistasis, multiple functional readouts, single lab","pmids":["25226517"],"is_preprint":false},{"year":2012,"finding":"T-plastin synthesis in Sézary cells and normal lymphocytes can be induced by calcium influx (PMA/ionomycin stimulation), and this induction is suppressed by calcineurin inhibitors and involves the NFAT transcription pathway. Constitutive T-plastin expression in SS cells is associated with resistance to etoposide-induced apoptosis and cell migration toward chemokines TARC/CCL17 and IP-10.","method":"PMA/ionomycin stimulation, calcineurin inhibitor treatment, functional migration and apoptosis assays","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological pathway placement with functional phenotype readouts, single lab","pmids":["22627769"],"is_preprint":false},{"year":2017,"finding":"T-plastin (PLS3) mediates hypoxia-induced membrane trafficking. T-plastin is recruited to the plasma membrane under hypoxic conditions (identified by SILAC), and T-plastin knockdown cells fail to show the hypoxia-induced increase in membrane endocytosis; this effect is independent of the HIF system.","method":"SILAC proteomics, FM1-43 and mCLING membrane trafficking assays, T-plastin knockdown, electron microscopy","journal":"Acta physiologica (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SILAC identification plus knockdown with functional endocytosis readout, single lab, multiple orthogonal methods","pmids":["28218996"],"is_preprint":false},{"year":2017,"finding":"LCP1 (lymphocyte cytosolic protein 1) was identified as a binding partner of PLS3. The p.Ala253_Leu254insAsn mutation in PLS3 disrupts the PLS3–LCP1 interaction. Both PLS3 and LCP1 regulate intracellular Ca2+, and the mutation weakens this regulation. The PLS3–LCP1 interaction is enhanced under low extracellular Ca2+ concentrations.","method":"Co-immunoprecipitation (binding partner identification and mutation effect), intracellular Ca2+ measurement","journal":"Clinical genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP for binding partner plus functional Ca2+ assay with mutation validation, single lab, two methods","pmids":["28646489"],"is_preprint":false},{"year":2023,"finding":"PLS3 localizes to focal adhesions in osteoblasts and is required for mechanosensitive responses to ECM stiffness. Depletion of PLS3 does not affect collagen matrix deposition but severely impairs subsequent matrix mineralization. PLS3-depleted osteoblasts are unresponsive to changes in ECM stiffness (no change in cell size, FA length, or FA number on soft vs. stiff substrates). Rescue with wild-type PLS3 but not with three patient-derived actin-bundling-defective mutants restores mechanoresponsiveness, demonstrating that actin-bundling activity is specifically required.","method":"Stable PLS3 knockdown in MC3T3-E1 cells, osteogenic differentiation assay, hydrogels of defined stiffness, rescue with wild-type vs. mutant PLS3, focal adhesion quantification","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KD with mechanistic rescue using structure-function mutants, multiple orthogonal cellular readouts, single lab","pmids":["38089885"],"is_preprint":false},{"year":2019,"finding":"PLS3 overexpression delays the ataxic phenotype in Chp1 mutant (vacillator) mice, ameliorates axon hypertrophy and axonal swellings in Purkinje neurons, and shows a trend toward increased membrane targeting/expression of NHE1 (an important CHP1 binding partner) in the cerebellum. PLS3 directly interacts with CHP1 (calcineurin-like EF-hand protein 1).","method":"Transgenic PLS3 overexpression in Chp1 mutant mice, histological analysis, immunofluorescence, Western blot","journal":"Frontiers in neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic modifier experiment with histological and molecular readouts; NHE1 finding is a trend, not statistically established","pmids":["31607845"],"is_preprint":false},{"year":1999,"finding":"The human T-plastin gene promoter contains a CCAAT box, Sp1 motif, and four AP2 motifs but no TATA or Inr sequence. A T-plastin-specific enhancer was identified ~500 bp from the basal promoter consisting of two inverted symmetric octamers. CpG island methylation within the first intron correlates with silencing in leukocyte cells. In leukemia cells, the T-plastin enhancer (but not the SV40 enhancer) fails to activate transcription.","method":"S1 mapping, promoter reporter assays (luciferase/CAT), DNA footprinting, restriction enzyme methylation analysis","journal":"DNA and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter/enhancer identification by footprinting and reporter assays, multiple methods, single lab","pmids":["10025506"],"is_preprint":false},{"year":2012,"finding":"Promoter hypomethylation of CpG dinucleotides 95-99 within the PLS3 CpG island is specifically associated with aberrant PLS3 expression in Sézary syndrome T cells. In vitro methylation of the cloned PLS3 promoter suppresses transcriptional activity, and 5-azacytidine treatment induces PLS3 expression in PLS3-negative cells.","method":"Pyrosequencing of CpG dinucleotides, luciferase reporter assay with methylated promoter construct, 5-azacytidine treatment","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter methylation assay plus functional reporter and pharmacological validation, two independent papers with consistent findings","pmids":["22495182","25806852"],"is_preprint":false},{"year":2023,"finding":"Specific missense variants in the actin-binding domains of PLS3 (e.g., p.Trp499Cys) cause congenital diaphragmatic hernia and body-wall defects, in contrast to loss-of-function variants that cause osteoporosis. A mouse knockin of c.1497G>C (p.Trp499Cys) recapitulates diaphragm and abdominal-wall defects and shows increased (not decreased) bone mineral density, suggesting these CDH-associated missense variants have a gain-of-function effect on the actin-binding domains.","method":"Mouse knockin model, in silico protein structural modeling, clinical exome/genome sequencing with segregation analysis","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockin mouse model with phenotype and BMD measurement; gain-of-function interpretation is supported by structural modeling but not directly demonstrated biochemically","pmids":["37751738"],"is_preprint":false},{"year":2013,"finding":"Pathogenic variants in PLS3 cause X-linked osteoporosis with fractures. In vivo analyses in zebrafish support bone-regulatory properties of PLS3.","method":"Whole-exome sequencing, Sanger sequencing, zebrafish in vivo morpholino/genetic analysis","journal":"The New England journal of medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic discovery with in vivo zebrafish functional validation; mechanism not fully elucidated but functional role in bone health established","pmids":["24088043"],"is_preprint":false},{"year":2024,"finding":"ACTN1 and ACTN4 (but not FSCN1) can rescue skeletal deformities in zebrafish after pls3 morpholino knockdown, indicating functional compensation among actin-bundling proteins. RNA-seq in Pls3-knockdown MLO-Y4 osteocyte-like cells revealed differential expression of Wnt1, Nos1ap, and Myh3, implicating Wnt and Th17 cell differentiation pathways. WNT2 was significantly increased in patient osteoblast-like cells compared with healthy donors.","method":"Zebrafish morpholino knockdown with mRNA rescue, RNA-seq in MLO-Y4 cells, primary fibroblast osteogenic differentiation","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic epistasis (zebrafish rescue) plus transcriptomic pathway placement, single lab","pmids":["39273077"],"is_preprint":false},{"year":2025,"finding":"PLS3 (plastin 3) exhibits reduced F-actin bundling activity at alkaline physiological pH, functioning as a cytoskeletal pH sensor. The reduced bundling at elevated pH is linked to decreased affinity of the N-terminal actin-binding domain (ABD1) for actin. A conserved histidine residue (His207 in PLS2 as the model) was identified as one pH-sensing residue; mutation to Lys enhances and mutation to Tyr reduces bundling, modulating pH sensitivity.","method":"In vitro F-actin bundling assays at different pH, fibroblast cell experiments with ectopic PLS2/PLS3 expression and pH manipulation, site-directed mutagenesis of His207","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution with mutagenesis, but preprint (not peer-reviewed) and PLS3 pH-sensing is directly reported alongside PLS2 as the primary model","pmids":["bio_10.1101_2025.03.26.645573"],"is_preprint":true},{"year":1996,"finding":"T-plastin expression is elevated ~12-fold in cisplatin-resistant T24/DDP10 bladder cancer cells compared to parental cells. Transfection of cisplatin-resistant cells with antisense T-plastin RNA reduced T-plastin expression and increased cisplatin sensitivity, indicating T-plastin contributes to cisplatin resistance.","method":"mRNA differential display, Northern blot, antisense RNA transfection with drug sensitivity assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — antisense loss-of-function with drug sensitivity phenotype, single lab, one method","pmids":["8941723"],"is_preprint":false},{"year":2015,"finding":"T-plastin was identified as a novel host cell response factor regulating HCV replication. Chemical proteomic profiling in HCV-infected cells identified T-plastin as differentially labeled by thiol-reactive probes, and its regulation was associated with HCV replication.","method":"Transcriptome analysis combined with quantitative chemical proteomic profiling using thiol-reactive probes (activity-based protein profiling)","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — chemical proteomic identification with functional association but limited mechanistic detail in abstract; single lab, single approach","pmids":["25909246"],"is_preprint":false},{"year":2018,"finding":"Bioinformatic analysis of all reported PLS3 disease mutations identified a critical LOOP-1 region (residues ~240-266) that physically connects the CH1 and CH2 domains of ABD1 and is located at the ABD1-ABD2 interface, predicting it to be crucial for conformational transitions and actin-binding function of plastin-3.","method":"Homology modelling, molecular dynamics simulation, targeted gene sequencing","journal":"International journal of endocrinology","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational structural prediction only; no experimental validation of the proposed mechanism reported in the abstract","pmids":["30405713"],"is_preprint":false},{"year":2009,"finding":"ZNF471 directly binds to the promoter of PLS3 (and TFAP2A) and transcriptionally represses PLS3 expression by recruiting co-repressor KAP1, leading to H3K9me3 enrichment at the PLS3 promoter.","method":"ChIP-PCR, ectopic ZNF471 expression with transcriptional readout, co-immunoprecipitation of KAP1","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ChIP-PCR demonstrating ZNF471 binding to PLS3 promoter plus co-repressor recruitment, single lab but multiple orthogonal methods","pmids":["29610526"],"is_preprint":false}],"current_model":"PLS3 encodes T-plastin, an evolutionarily ancient calcium-sensitive actin-bundling protein that cross-links actin filaments in both parallel and antiparallel orientations via tandem calponin-homology domains (structurally resolved by cryo-EM); it stabilizes actin filaments by competing with the depolymerizing factor cofilin, promotes Arp2/3-mediated actin dynamics, localizes to focal adhesions and cortical actin where it is essential for myosin II activation and mechanosensitive signaling in osteoblasts, mediates hypoxia-induced and Rab5-dependent endocytosis, and acts downstream of calcineurin/NFAT signaling to drive cell migration; its transcription is regulated by CpG island methylation and by ZNF471-KAP1-mediated H3K9me3, and loss-of-function mutations cause X-linked early-onset osteoporosis by impairing osteoblast mechanotransduction and bone matrix mineralization, while specific gain-of-function missense variants in the actin-binding domains cause congenital diaphragmatic hernia."},"narrative":{"mechanistic_narrative":"PLS3 encodes T-plastin, a calcium-sensitive actin-bundling protein that cross-links actin filaments and thereby organizes the cytoskeletal architecture underlying cell shape, migration, mechanosensing, and membrane trafficking [PMID:36067297, PMID:7806577]. Cryo-EM resolves T-plastin bridging pairs of actin filaments in both parallel and antiparallel orientations through a sequential bundling mechanism in which inter-CHD linkers enable flexible yet stable cross-linking [PMID:36067297]. Beyond cross-linking, T-plastin stabilizes individual filaments by displacing cofilin and inhibiting cofilin-mediated depolymerization, and it accelerates Arp2/3-driven actin-based motility—activities retained by an isolated actin-binding domain independent of bundle formation [PMID:15741236]. These properties translate into defined cellular roles: T-plastin localizes to the cell cortex and active membrane protrusions where it widens and lengthens F-actin to bridge ECM gaps, and is required for the cortical localization and activation of myosin II [PMID:32968060, PMID:28559444]. T-plastin expression is controlled downstream of calcineurin/NFAT signaling, where it drives keratinocyte migration, lamellipodia formation, and FAK/integrin expression [PMID:25226517, PMID:22627769], and its interaction with activated Rab5 promotes endocytosis [PMID:21426900]. It binds CORO1C in a calcium-dependent manner to support endocytosis at the neuromuscular junction, an activity that rescues defects in SMN-deficient models [PMID:27499521]. In bone, PLS3 localizes to focal adhesions and confers osteoblast responsiveness to ECM stiffness and matrix mineralization, with bundling-defective patient mutants failing to rescue this function [PMID:38089885]. Loss-of-function PLS3 variants cause X-linked early-onset osteoporosis with fractures, whereas specific actin-binding-domain missense variants act through a gain-of-function mechanism to cause congenital diaphragmatic hernia and body-wall defects [PMID:37751738, PMID:24088043]. PLS3 transcription is repressed by CpG island methylation and by ZNF471-directed recruitment of KAP1 and H3K9me3 deposition at its promoter [PMID:22495182, PMID:25806852, PMID:29610526].","teleology":[{"year":1994,"claim":"Established that T-plastin is not functionally redundant with its paralog L-plastin but plays distinct, cell-type-specific roles in actin organization, defining the protein as a bona fide actin-organizing factor with unique behavior.","evidence":"Overexpression of both isoforms in CV-1 and LLC-PK1 cells with detergent extraction and imaging","pmids":["7806577"],"confidence":"High","gaps":["Did not resolve the structural basis of isoform-specific filament association","Mechanism of microvillar versus stress-fiber selectivity not defined"]},{"year":1995,"claim":"Showed that T-plastin actin-bundling activity is functionally required for actin-driven cellular events by demonstrating its necessity for Shigella invasion, linking bundle architecture to a discrete biological outcome.","evidence":"Dominant-negative truncated T-plastin construct, immunofluorescence co-localization, and electron microscopy in HeLa cells","pmids":["7721941"],"confidence":"High","gaps":["The general (non-infection) cellular processes requiring bundling were not addressed","Did not separate bundling from filament-stabilization activities"]},{"year":1999,"claim":"Defined the transcriptional control elements of T-plastin and first linked CpG island methylation to its silencing, opening the question of epigenetic regulation.","evidence":"S1 mapping, promoter/enhancer reporter assays, DNA footprinting, and methylation analysis","pmids":["10025506"],"confidence":"Medium","gaps":["Trans-acting factors driving methylation not identified","Functional consequences of enhancer silencing in disease not established"]},{"year":2005,"claim":"Separated T-plastin's filament-stabilizing activity from its cross-linking activity, showing it competes with cofilin and promotes Arp2/3-based motility independent of bundle formation.","evidence":"Biomimetic VCA-bead motility assay, in vitro depolymerization assay, and cell-based expression of an ABD1-only fragment","pmids":["15741236"],"confidence":"High","gaps":["Did not establish whether cofilin competition operates in vivo","Quantitative contribution of each activity to migration unresolved"]},{"year":2011,"claim":"Connected T-plastin to membrane trafficking by identifying its specific interaction with activated Rab5 and its enhancement of endocytosis.","evidence":"Affinity pulldown with constitutively active Rab5, co-localization, and fluid-phase endocytosis assay in Cos-1 cells","pmids":["21426900"],"confidence":"Medium","gaps":["Direct versus indirect Rab5 binding not distinguished","Single cell line, no reciprocal validation"]},{"year":2012,"claim":"Placed T-plastin downstream of calcium/calcineurin/NFAT signaling and linked its aberrant expression to malignant lymphocyte phenotypes including migration and apoptosis resistance.","evidence":"PMA/ionomycin stimulation, calcineurin inhibitor treatment, and migration/apoptosis assays in Sézary cells; plus pyrosequencing and reporter assays linking promoter hypomethylation to aberrant expression","pmids":["22627769","22495182","25806852"],"confidence":"Medium","gaps":["Direct NFAT binding to the PLS3 promoter not demonstrated","Causal link between expression and apoptosis resistance correlative"]},{"year":2013,"claim":"Identified PLS3 as the causal gene for X-linked osteoporosis with fractures, establishing a Mendelian disease link and an unexpected role in bone.","evidence":"Whole-exome and Sanger sequencing in families plus zebrafish in vivo functional analysis","pmids":["24088043"],"confidence":"Medium","gaps":["Cellular mechanism in bone not resolved at discovery","How an actin-bundler regulates mineralization unknown at the time"]},{"year":2016,"claim":"Demonstrated that PLS3 functions in an endocytic pathway via a calcium-dependent interaction with CORO1C, providing a mechanistic basis for its protective effect in motor neuron disease models.","evidence":"Proteomics, biochemical binding assays, FM1-43 endocytosis assays, and in vivo rescue in SMN-deficient zebrafish and mouse models","pmids":["27499521"],"confidence":"High","gaps":["How the PLS3-CORO1C complex couples to the endocytic machinery not defined","Relationship between bundling activity and endocytic rescue unresolved"]},{"year":2017,"claim":"Defined a cortical role for T-plastin in activating myosin II and organizing the basement membrane, and showed it mediates hypoxia-induced endocytosis independent of the HIF system.","evidence":"In utero siRNA depletion in mouse epidermis with myosin II inhibition; SILAC proteomics with FM1-43/mCLING trafficking assays under hypoxia","pmids":["28559444","28218996"],"confidence":"High","gaps":["Mechanism by which T-plastin activates myosin II not defined","Signal coupling hypoxia to T-plastin membrane recruitment unknown"]},{"year":2017,"claim":"Identified LCP1 as a calcium-modulated PLS3 partner and showed a patient mutation disrupts both the interaction and intracellular calcium regulation.","evidence":"Co-immunoprecipitation and intracellular Ca2+ measurement with mutation testing","pmids":["28646489"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal validation","Mechanism linking the interaction to Ca2+ handling not defined"]},{"year":2018,"claim":"Identified ZNF471 as a sequence-specific repressor of PLS3 that recruits KAP1 to deposit H3K9me3, adding a defined chromatin-based layer of transcriptional control.","evidence":"ChIP-PCR, ectopic ZNF471 expression with transcriptional readout, and KAP1 co-immunoprecipitation","pmids":["29610526"],"confidence":"Medium","gaps":["Physiological contexts in which this repression operates not defined","Interplay with CpG methylation not addressed"]},{"year":2019,"claim":"Showed PLS3 acts as a genetic modifier in neurodegeneration through a direct interaction with CHP1, broadening its partner network beyond actin and endocytic factors.","evidence":"Transgenic PLS3 overexpression in Chp1 mutant mice with histology, immunofluorescence, and Western blot","pmids":["31607845"],"confidence":"Medium","gaps":["NHE1 membrane-targeting effect was a trend, not statistically established","Direct CHP1 binding interface not mapped"]},{"year":2022,"claim":"Resolved the structural mechanism of bundling, showing T-plastin cross-links filaments in both parallel and antiparallel orientations through a sequential mechanism dependent on inter-CHD linkers.","evidence":"Cryo-EM with a machine-learning pipeline plus biochemical, cell biological, and mutagenesis validation","pmids":["36067297"],"confidence":"High","gaps":["Calcium-dependent conformational regulation not fully resolved structurally","Structural basis of disease mutations not directly mapped in this study"]},{"year":2023,"claim":"Mechanistically linked PLS3 to bone disease by showing its actin-bundling activity is specifically required for osteoblast mechanosensing of ECM stiffness and matrix mineralization, and that distinct missense variants cause CDH via a gain-of-function mechanism.","evidence":"Stable knockdown in MC3T3-E1 cells with stiffness hydrogels and structure-function mutant rescue; mouse knockin of p.Trp499Cys with phenotype and BMD measurement plus structural modeling","pmids":["38089885","37751738"],"confidence":"Medium","gaps":["Gain-of-function biochemical mechanism for CDH variants not directly demonstrated","How focal adhesion bundling couples to mineralization signaling unresolved"]},{"year":2024,"claim":"Established functional compensation among actin-bundlers in vivo and placed PLS3 upstream of Wnt signaling in bone-forming cells.","evidence":"Zebrafish morpholino knockdown with ACTN1/ACTN4/FSCN1 mRNA rescue and RNA-seq in MLO-Y4 osteocyte-like cells","pmids":["39273077"],"confidence":"Medium","gaps":["Direct mechanism linking PLS3 to Wnt regulation not defined","Transcriptomic changes are associations, not validated effectors"]},{"year":2025,"claim":"Proposed that plastin bundling activity is pH-sensitive, identifying T-plastin as a candidate cytoskeletal pH sensor via the ABD1 actin interface.","evidence":"In vitro pH-dependent F-actin bundling assays and His207 site-directed mutagenesis (preprint, primarily modeled on PLS2)","pmids":["bio_10.1101_2025.03.26.645573"],"confidence":"Medium","gaps":["Not peer-reviewed; PLS3 pH sensing inferred alongside PLS2 as model","Physiological relevance of pH sensing in vivo not established"]},{"year":null,"claim":"How calcium and pH binding mechanically gate the bundling/stabilization switch, and how this connects the actin, endocytic, and mechanosensing functions into a unified regulatory logic, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated structural model coupling Ca2+/pH sensing to disease mutations","Tissue-specific selection of bundling versus stabilization activity undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,2,3,5,12]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[19]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,2,5]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6,7,10]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[7]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[4,7,10]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,9,12]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[14,15,23]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[16,17]}],"complexes":[],"partners":["CORO1C","LCP1","CHP1","RAB5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P13797","full_name":"Plastin-3","aliases":["T-fimbrin","T-plastin"],"length_aa":630,"mass_kda":70.8,"function":"Actin-bundling protein","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P13797/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PLS3","classification":"Not 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Inter-CHD linkers were identified as key structural elements enabling flexible but stable cross-linking.\",\n      \"method\": \"Cryo-electron microscopy with machine-learning-enabled pipeline, biochemical assays, cell biological experiments, mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure combined with biochemical and cell biological validation in a single rigorous study\",\n      \"pmids\": [\"36067297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"T-plastin is functionally required for Shigella flexneri entry into HeLa cells. T-plastin co-localizes with parallel actin filament bundles in parasite-induced cellular protrusions, and expression of a truncated T-plastin lacking one actin-binding site inhibits bacterial entry, demonstrating a direct functional role in actin bundle architecture during invasion.\",\n      \"method\": \"Transfection of truncated T-plastin dominant-negative construct, immunofluorescence co-localization, electron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function via dominant-negative with defined phenotype, co-localization, replicated across multiple experimental approaches\",\n      \"pmids\": [\"7721941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"T-plastin and L-plastin isoforms play distinct, cell-type-specific roles in actin filament organization. In LLC-PK1 epithelial cells, T-plastin induces shape changes in microvilli and remains associated with microvillar actin filaments after detergent extraction, while L-plastin has no effect on microvilli. In CV-1 fibroblast-like cells, overproduction of both isoforms induces cell rounding and reorganization of actin stress fibers, but T-plastin is largely extracted by non-ionic detergent while L-plastin remains associated with microfilaments.\",\n      \"method\": \"Overexpression in CV-1 and LLC-PK1 cell lines, non-ionic detergent extraction, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (overexpression, detergent extraction, imaging) across two cell lines establishing isoform-specific functions\",\n      \"pmids\": [\"7806577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"T-plastin increases the velocity of Arp2/3-mediated actin-based bead movement by ~1.5-fold, stabilizes actin comets, displaces cofilin, and inhibits cofilin-mediated actin filament depolymerization in vitro. A bundling-incompetent variant comprising only ABD1 had similar stabilizing effects, indicating that T-plastin controls actin turnover via filament binding independently of cross-link/bundle formation.\",\n      \"method\": \"Quantitative biomimetic motility assay (VCA-coated beads in cell-free extracts), in vitro depolymerization assay, cell-based overexpression of ABD1 fragment\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution assay plus mutagenesis (truncation variant) plus cell-based validation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"15741236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PLS3 overexpression restores endocytosis in SMN-deficient cells and neuromuscular junctions. CORO1C was identified as a direct binding partner of PLS3, with their interaction being calcium-dependent. Both PLS3 and CORO1C overexpression elevate F-actin levels and rescue endocytosis defects and axonal truncation in Smn-depleted zebrafish, placing PLS3 in an endocytic pathway downstream of SMN.\",\n      \"method\": \"Proteomics, biochemical interaction assays, FM1-43 endocytosis assay in NMJs, SMN-knockdown zebrafish rescue experiments, PLS3 overexpression in SMA mouse model\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (proteomics, direct binding, electrophysiology, in vivo rescue), replicated across cell and animal models\",\n      \"pmids\": [\"27499521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"T-plastin promotes membrane protrusions and enables cells to bridge ECM gaps during migration. T-plastin is specifically enriched in active protrusions where F-actin is devoid of non-muscle myosin II activity, and it widens and lengthens protrusions to stabilize actin filaments.\",\n      \"method\": \"Micropatterned ECM substrates, live-cell imaging, T-plastin knockdown/knockout, co-localization with myosin II markers\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with defined cellular phenotype on engineered substrates, multiple imaging approaches establishing localization-function link\",\n      \"pmids\": [\"32968060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"T-plastin (Pls3) localizes to the cell cortex and is essential for the localization and activation of myosin II in mouse epidermal cells. In utero depletion of Pls3 caused basement membrane and polarity defects in the epidermis; apicobasal polarity defects were secondary to basement membrane disruption. Inhibition of myosin II motor activity similarly disrupted basement membrane organization.\",\n      \"method\": \"In utero siRNA depletion in mouse embryos, immunofluorescence, myosin II inhibition\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo loss-of-function with defined phenotype, epistasis established (polarity defects secondary to BM defects), multiple functional readouts\",\n      \"pmids\": [\"28559444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"T-plastin (and L-plastin) interacts specifically with activated (GTP-bound) Rab5, co-localizes with Rab5 on the plasma membrane and endosomes, and overexpression of T-plastin increases Rab5 activity and the rate of fluid-phase endocytosis in Cos-1 cells.\",\n      \"method\": \"Affinity column pulldown with constitutively active Rab5, co-localization by fluorescence microscopy, fluid-phase endocytosis assay, overexpression\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pulldown and co-localization with functional endocytosis readout, single lab, multiple methods\",\n      \"pmids\": [\"21426900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"T-plastin expression is regulated downstream of the calcineurin/NFAT signaling pathway in keratinocytes. Knockdown of NFAT2 or T-plastin, or treatment with calcineurin inhibitor FK506, reduces T-plastin expression and impairs keratinocyte migration, lamellipodia formation, and FAK and β6-integrin expression.\",\n      \"method\": \"siRNA knockdown, FK506 treatment, scratch and Boyden migration assays, immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway placement by genetic (siRNA) and pharmacological epistasis, multiple functional readouts, single lab\",\n      \"pmids\": [\"25226517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"T-plastin synthesis in Sézary cells and normal lymphocytes can be induced by calcium influx (PMA/ionomycin stimulation), and this induction is suppressed by calcineurin inhibitors and involves the NFAT transcription pathway. Constitutive T-plastin expression in SS cells is associated with resistance to etoposide-induced apoptosis and cell migration toward chemokines TARC/CCL17 and IP-10.\",\n      \"method\": \"PMA/ionomycin stimulation, calcineurin inhibitor treatment, functional migration and apoptosis assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological pathway placement with functional phenotype readouts, single lab\",\n      \"pmids\": [\"22627769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"T-plastin (PLS3) mediates hypoxia-induced membrane trafficking. T-plastin is recruited to the plasma membrane under hypoxic conditions (identified by SILAC), and T-plastin knockdown cells fail to show the hypoxia-induced increase in membrane endocytosis; this effect is independent of the HIF system.\",\n      \"method\": \"SILAC proteomics, FM1-43 and mCLING membrane trafficking assays, T-plastin knockdown, electron microscopy\",\n      \"journal\": \"Acta physiologica (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SILAC identification plus knockdown with functional endocytosis readout, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"28218996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LCP1 (lymphocyte cytosolic protein 1) was identified as a binding partner of PLS3. The p.Ala253_Leu254insAsn mutation in PLS3 disrupts the PLS3–LCP1 interaction. Both PLS3 and LCP1 regulate intracellular Ca2+, and the mutation weakens this regulation. The PLS3–LCP1 interaction is enhanced under low extracellular Ca2+ concentrations.\",\n      \"method\": \"Co-immunoprecipitation (binding partner identification and mutation effect), intracellular Ca2+ measurement\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP for binding partner plus functional Ca2+ assay with mutation validation, single lab, two methods\",\n      \"pmids\": [\"28646489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PLS3 localizes to focal adhesions in osteoblasts and is required for mechanosensitive responses to ECM stiffness. Depletion of PLS3 does not affect collagen matrix deposition but severely impairs subsequent matrix mineralization. PLS3-depleted osteoblasts are unresponsive to changes in ECM stiffness (no change in cell size, FA length, or FA number on soft vs. stiff substrates). Rescue with wild-type PLS3 but not with three patient-derived actin-bundling-defective mutants restores mechanoresponsiveness, demonstrating that actin-bundling activity is specifically required.\",\n      \"method\": \"Stable PLS3 knockdown in MC3T3-E1 cells, osteogenic differentiation assay, hydrogels of defined stiffness, rescue with wild-type vs. mutant PLS3, focal adhesion quantification\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with mechanistic rescue using structure-function mutants, multiple orthogonal cellular readouts, single lab\",\n      \"pmids\": [\"38089885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PLS3 overexpression delays the ataxic phenotype in Chp1 mutant (vacillator) mice, ameliorates axon hypertrophy and axonal swellings in Purkinje neurons, and shows a trend toward increased membrane targeting/expression of NHE1 (an important CHP1 binding partner) in the cerebellum. PLS3 directly interacts with CHP1 (calcineurin-like EF-hand protein 1).\",\n      \"method\": \"Transgenic PLS3 overexpression in Chp1 mutant mice, histological analysis, immunofluorescence, Western blot\",\n      \"journal\": \"Frontiers in neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic modifier experiment with histological and molecular readouts; NHE1 finding is a trend, not statistically established\",\n      \"pmids\": [\"31607845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The human T-plastin gene promoter contains a CCAAT box, Sp1 motif, and four AP2 motifs but no TATA or Inr sequence. A T-plastin-specific enhancer was identified ~500 bp from the basal promoter consisting of two inverted symmetric octamers. CpG island methylation within the first intron correlates with silencing in leukocyte cells. In leukemia cells, the T-plastin enhancer (but not the SV40 enhancer) fails to activate transcription.\",\n      \"method\": \"S1 mapping, promoter reporter assays (luciferase/CAT), DNA footprinting, restriction enzyme methylation analysis\",\n      \"journal\": \"DNA and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter/enhancer identification by footprinting and reporter assays, multiple methods, single lab\",\n      \"pmids\": [\"10025506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Promoter hypomethylation of CpG dinucleotides 95-99 within the PLS3 CpG island is specifically associated with aberrant PLS3 expression in Sézary syndrome T cells. In vitro methylation of the cloned PLS3 promoter suppresses transcriptional activity, and 5-azacytidine treatment induces PLS3 expression in PLS3-negative cells.\",\n      \"method\": \"Pyrosequencing of CpG dinucleotides, luciferase reporter assay with methylated promoter construct, 5-azacytidine treatment\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter methylation assay plus functional reporter and pharmacological validation, two independent papers with consistent findings\",\n      \"pmids\": [\"22495182\", \"25806852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Specific missense variants in the actin-binding domains of PLS3 (e.g., p.Trp499Cys) cause congenital diaphragmatic hernia and body-wall defects, in contrast to loss-of-function variants that cause osteoporosis. A mouse knockin of c.1497G>C (p.Trp499Cys) recapitulates diaphragm and abdominal-wall defects and shows increased (not decreased) bone mineral density, suggesting these CDH-associated missense variants have a gain-of-function effect on the actin-binding domains.\",\n      \"method\": \"Mouse knockin model, in silico protein structural modeling, clinical exome/genome sequencing with segregation analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockin mouse model with phenotype and BMD measurement; gain-of-function interpretation is supported by structural modeling but not directly demonstrated biochemically\",\n      \"pmids\": [\"37751738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Pathogenic variants in PLS3 cause X-linked osteoporosis with fractures. In vivo analyses in zebrafish support bone-regulatory properties of PLS3.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing, zebrafish in vivo morpholino/genetic analysis\",\n      \"journal\": \"The New England journal of medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic discovery with in vivo zebrafish functional validation; mechanism not fully elucidated but functional role in bone health established\",\n      \"pmids\": [\"24088043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ACTN1 and ACTN4 (but not FSCN1) can rescue skeletal deformities in zebrafish after pls3 morpholino knockdown, indicating functional compensation among actin-bundling proteins. RNA-seq in Pls3-knockdown MLO-Y4 osteocyte-like cells revealed differential expression of Wnt1, Nos1ap, and Myh3, implicating Wnt and Th17 cell differentiation pathways. WNT2 was significantly increased in patient osteoblast-like cells compared with healthy donors.\",\n      \"method\": \"Zebrafish morpholino knockdown with mRNA rescue, RNA-seq in MLO-Y4 cells, primary fibroblast osteogenic differentiation\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic epistasis (zebrafish rescue) plus transcriptomic pathway placement, single lab\",\n      \"pmids\": [\"39273077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PLS3 (plastin 3) exhibits reduced F-actin bundling activity at alkaline physiological pH, functioning as a cytoskeletal pH sensor. The reduced bundling at elevated pH is linked to decreased affinity of the N-terminal actin-binding domain (ABD1) for actin. A conserved histidine residue (His207 in PLS2 as the model) was identified as one pH-sensing residue; mutation to Lys enhances and mutation to Tyr reduces bundling, modulating pH sensitivity.\",\n      \"method\": \"In vitro F-actin bundling assays at different pH, fibroblast cell experiments with ectopic PLS2/PLS3 expression and pH manipulation, site-directed mutagenesis of His207\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution with mutagenesis, but preprint (not peer-reviewed) and PLS3 pH-sensing is directly reported alongside PLS2 as the primary model\",\n      \"pmids\": [\"bio_10.1101_2025.03.26.645573\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"T-plastin expression is elevated ~12-fold in cisplatin-resistant T24/DDP10 bladder cancer cells compared to parental cells. Transfection of cisplatin-resistant cells with antisense T-plastin RNA reduced T-plastin expression and increased cisplatin sensitivity, indicating T-plastin contributes to cisplatin resistance.\",\n      \"method\": \"mRNA differential display, Northern blot, antisense RNA transfection with drug sensitivity assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — antisense loss-of-function with drug sensitivity phenotype, single lab, one method\",\n      \"pmids\": [\"8941723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"T-plastin was identified as a novel host cell response factor regulating HCV replication. Chemical proteomic profiling in HCV-infected cells identified T-plastin as differentially labeled by thiol-reactive probes, and its regulation was associated with HCV replication.\",\n      \"method\": \"Transcriptome analysis combined with quantitative chemical proteomic profiling using thiol-reactive probes (activity-based protein profiling)\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — chemical proteomic identification with functional association but limited mechanistic detail in abstract; single lab, single approach\",\n      \"pmids\": [\"25909246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Bioinformatic analysis of all reported PLS3 disease mutations identified a critical LOOP-1 region (residues ~240-266) that physically connects the CH1 and CH2 domains of ABD1 and is located at the ABD1-ABD2 interface, predicting it to be crucial for conformational transitions and actin-binding function of plastin-3.\",\n      \"method\": \"Homology modelling, molecular dynamics simulation, targeted gene sequencing\",\n      \"journal\": \"International journal of endocrinology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational structural prediction only; no experimental validation of the proposed mechanism reported in the abstract\",\n      \"pmids\": [\"30405713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ZNF471 directly binds to the promoter of PLS3 (and TFAP2A) and transcriptionally represses PLS3 expression by recruiting co-repressor KAP1, leading to H3K9me3 enrichment at the PLS3 promoter.\",\n      \"method\": \"ChIP-PCR, ectopic ZNF471 expression with transcriptional readout, co-immunoprecipitation of KAP1\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ChIP-PCR demonstrating ZNF471 binding to PLS3 promoter plus co-repressor recruitment, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"29610526\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PLS3 encodes T-plastin, an evolutionarily ancient calcium-sensitive actin-bundling protein that cross-links actin filaments in both parallel and antiparallel orientations via tandem calponin-homology domains (structurally resolved by cryo-EM); it stabilizes actin filaments by competing with the depolymerizing factor cofilin, promotes Arp2/3-mediated actin dynamics, localizes to focal adhesions and cortical actin where it is essential for myosin II activation and mechanosensitive signaling in osteoblasts, mediates hypoxia-induced and Rab5-dependent endocytosis, and acts downstream of calcineurin/NFAT signaling to drive cell migration; its transcription is regulated by CpG island methylation and by ZNF471-KAP1-mediated H3K9me3, and loss-of-function mutations cause X-linked early-onset osteoporosis by impairing osteoblast mechanotransduction and bone matrix mineralization, while specific gain-of-function missense variants in the actin-binding domains cause congenital diaphragmatic hernia.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PLS3 encodes T-plastin, a calcium-sensitive actin-bundling protein that cross-links actin filaments and thereby organizes the cytoskeletal architecture underlying cell shape, migration, mechanosensing, and membrane trafficking [#0, #2]. Cryo-EM resolves T-plastin bridging pairs of actin filaments in both parallel and antiparallel orientations through a sequential bundling mechanism in which inter-CHD linkers enable flexible yet stable cross-linking [#0]. Beyond cross-linking, T-plastin stabilizes individual filaments by displacing cofilin and inhibiting cofilin-mediated depolymerization, and it accelerates Arp2/3-driven actin-based motility—activities retained by an isolated actin-binding domain independent of bundle formation [#3]. These properties translate into defined cellular roles: T-plastin localizes to the cell cortex and active membrane protrusions where it widens and lengthens F-actin to bridge ECM gaps, and is required for the cortical localization and activation of myosin II [#5, #6]. T-plastin expression is controlled downstream of calcineurin/NFAT signaling, where it drives keratinocyte migration, lamellipodia formation, and FAK/integrin expression [#8, #9], and its interaction with activated Rab5 promotes endocytosis [#7]. It binds CORO1C in a calcium-dependent manner to support endocytosis at the neuromuscular junction, an activity that rescues defects in SMN-deficient models [#4]. In bone, PLS3 localizes to focal adhesions and confers osteoblast responsiveness to ECM stiffness and matrix mineralization, with bundling-defective patient mutants failing to rescue this function [#12]. Loss-of-function PLS3 variants cause X-linked early-onset osteoporosis with fractures, whereas specific actin-binding-domain missense variants act through a gain-of-function mechanism to cause congenital diaphragmatic hernia and body-wall defects [#16, #17]. PLS3 transcription is repressed by CpG island methylation and by ZNF471-directed recruitment of KAP1 and H3K9me3 deposition at its promoter [#15, #23].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established that T-plastin is not functionally redundant with its paralog L-plastin but plays distinct, cell-type-specific roles in actin organization, defining the protein as a bona fide actin-organizing factor with unique behavior.\",\n      \"evidence\": \"Overexpression of both isoforms in CV-1 and LLC-PK1 cells with detergent extraction and imaging\",\n      \"pmids\": [\"7806577\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural basis of isoform-specific filament association\", \"Mechanism of microvillar versus stress-fiber selectivity not defined\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Showed that T-plastin actin-bundling activity is functionally required for actin-driven cellular events by demonstrating its necessity for Shigella invasion, linking bundle architecture to a discrete biological outcome.\",\n      \"evidence\": \"Dominant-negative truncated T-plastin construct, immunofluorescence co-localization, and electron microscopy in HeLa cells\",\n      \"pmids\": [\"7721941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The general (non-infection) cellular processes requiring bundling were not addressed\", \"Did not separate bundling from filament-stabilization activities\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined the transcriptional control elements of T-plastin and first linked CpG island methylation to its silencing, opening the question of epigenetic regulation.\",\n      \"evidence\": \"S1 mapping, promoter/enhancer reporter assays, DNA footprinting, and methylation analysis\",\n      \"pmids\": [\"10025506\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trans-acting factors driving methylation not identified\", \"Functional consequences of enhancer silencing in disease not established\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Separated T-plastin's filament-stabilizing activity from its cross-linking activity, showing it competes with cofilin and promotes Arp2/3-based motility independent of bundle formation.\",\n      \"evidence\": \"Biomimetic VCA-bead motility assay, in vitro depolymerization assay, and cell-based expression of an ABD1-only fragment\",\n      \"pmids\": [\"15741236\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether cofilin competition operates in vivo\", \"Quantitative contribution of each activity to migration unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected T-plastin to membrane trafficking by identifying its specific interaction with activated Rab5 and its enhancement of endocytosis.\",\n      \"evidence\": \"Affinity pulldown with constitutively active Rab5, co-localization, and fluid-phase endocytosis assay in Cos-1 cells\",\n      \"pmids\": [\"21426900\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect Rab5 binding not distinguished\", \"Single cell line, no reciprocal validation\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed T-plastin downstream of calcium/calcineurin/NFAT signaling and linked its aberrant expression to malignant lymphocyte phenotypes including migration and apoptosis resistance.\",\n      \"evidence\": \"PMA/ionomycin stimulation, calcineurin inhibitor treatment, and migration/apoptosis assays in Sézary cells; plus pyrosequencing and reporter assays linking promoter hypomethylation to aberrant expression\",\n      \"pmids\": [\"22627769\", \"22495182\", \"25806852\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct NFAT binding to the PLS3 promoter not demonstrated\", \"Causal link between expression and apoptosis resistance correlative\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified PLS3 as the causal gene for X-linked osteoporosis with fractures, establishing a Mendelian disease link and an unexpected role in bone.\",\n      \"evidence\": \"Whole-exome and Sanger sequencing in families plus zebrafish in vivo functional analysis\",\n      \"pmids\": [\"24088043\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular mechanism in bone not resolved at discovery\", \"How an actin-bundler regulates mineralization unknown at the time\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated that PLS3 functions in an endocytic pathway via a calcium-dependent interaction with CORO1C, providing a mechanistic basis for its protective effect in motor neuron disease models.\",\n      \"evidence\": \"Proteomics, biochemical binding assays, FM1-43 endocytosis assays, and in vivo rescue in SMN-deficient zebrafish and mouse models\",\n      \"pmids\": [\"27499521\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the PLS3-CORO1C complex couples to the endocytic machinery not defined\", \"Relationship between bundling activity and endocytic rescue unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a cortical role for T-plastin in activating myosin II and organizing the basement membrane, and showed it mediates hypoxia-induced endocytosis independent of the HIF system.\",\n      \"evidence\": \"In utero siRNA depletion in mouse epidermis with myosin II inhibition; SILAC proteomics with FM1-43/mCLING trafficking assays under hypoxia\",\n      \"pmids\": [\"28559444\", \"28218996\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which T-plastin activates myosin II not defined\", \"Signal coupling hypoxia to T-plastin membrane recruitment unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified LCP1 as a calcium-modulated PLS3 partner and showed a patient mutation disrupts both the interaction and intracellular calcium regulation.\",\n      \"evidence\": \"Co-immunoprecipitation and intracellular Ca2+ measurement with mutation testing\",\n      \"pmids\": [\"28646489\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation\", \"Mechanism linking the interaction to Ca2+ handling not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified ZNF471 as a sequence-specific repressor of PLS3 that recruits KAP1 to deposit H3K9me3, adding a defined chromatin-based layer of transcriptional control.\",\n      \"evidence\": \"ChIP-PCR, ectopic ZNF471 expression with transcriptional readout, and KAP1 co-immunoprecipitation\",\n      \"pmids\": [\"29610526\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological contexts in which this repression operates not defined\", \"Interplay with CpG methylation not addressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed PLS3 acts as a genetic modifier in neurodegeneration through a direct interaction with CHP1, broadening its partner network beyond actin and endocytic factors.\",\n      \"evidence\": \"Transgenic PLS3 overexpression in Chp1 mutant mice with histology, immunofluorescence, and Western blot\",\n      \"pmids\": [\"31607845\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NHE1 membrane-targeting effect was a trend, not statistically established\", \"Direct CHP1 binding interface not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved the structural mechanism of bundling, showing T-plastin cross-links filaments in both parallel and antiparallel orientations through a sequential mechanism dependent on inter-CHD linkers.\",\n      \"evidence\": \"Cryo-EM with a machine-learning pipeline plus biochemical, cell biological, and mutagenesis validation\",\n      \"pmids\": [\"36067297\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Calcium-dependent conformational regulation not fully resolved structurally\", \"Structural basis of disease mutations not directly mapped in this study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mechanistically linked PLS3 to bone disease by showing its actin-bundling activity is specifically required for osteoblast mechanosensing of ECM stiffness and matrix mineralization, and that distinct missense variants cause CDH via a gain-of-function mechanism.\",\n      \"evidence\": \"Stable knockdown in MC3T3-E1 cells with stiffness hydrogels and structure-function mutant rescue; mouse knockin of p.Trp499Cys with phenotype and BMD measurement plus structural modeling\",\n      \"pmids\": [\"38089885\", \"37751738\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Gain-of-function biochemical mechanism for CDH variants not directly demonstrated\", \"How focal adhesion bundling couples to mineralization signaling unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established functional compensation among actin-bundlers in vivo and placed PLS3 upstream of Wnt signaling in bone-forming cells.\",\n      \"evidence\": \"Zebrafish morpholino knockdown with ACTN1/ACTN4/FSCN1 mRNA rescue and RNA-seq in MLO-Y4 osteocyte-like cells\",\n      \"pmids\": [\"39273077\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism linking PLS3 to Wnt regulation not defined\", \"Transcriptomic changes are associations, not validated effectors\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proposed that plastin bundling activity is pH-sensitive, identifying T-plastin as a candidate cytoskeletal pH sensor via the ABD1 actin interface.\",\n      \"evidence\": \"In vitro pH-dependent F-actin bundling assays and His207 site-directed mutagenesis (preprint, primarily modeled on PLS2)\",\n      \"pmids\": [\"bio_10.1101_2025.03.26.645573\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Not peer-reviewed; PLS3 pH sensing inferred alongside PLS2 as model\", \"Physiological relevance of pH sensing in vivo not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How calcium and pH binding mechanically gate the bundling/stabilization switch, and how this connects the actin, endocytic, and mechanosensing functions into a unified regulatory logic, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated structural model coupling Ca2+/pH sensing to disease mutations\", \"Tissue-specific selection of bundling versus stabilization activity undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 2, 3, 5, 12]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 7, 10]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [4, 7, 10]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 9, 12]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [14, 15, 23]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [16, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CORO1C\", \"LCP1\", \"CHP1\", \"RAB5\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":9,"faith_total":9,"faith_pct":100.0}}