{"gene":"PLCL1","run_date":"2026-04-28T19:45:44","timeline":{"discoveries":[{"year":1999,"finding":"PLCL1 (PLC-L2) was identified as a catalytically inactive phospholipase C-like protein; its PH domain binds strongly to PI(4,5)P2 and Ins(1,4,5)P3, and it localizes predominantly to perinuclear/endoplasmic reticulum areas in myoblast, myotube, and COS7 cells, suggesting a role in regulating Ins(1,4,5)P3 signaling near the ER.","method":"Biochemical binding assays, GFP-fusion live-cell imaging, subcellular fractionation, mutagenesis of catalytic residues","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1-2 — direct in vitro binding assays plus live imaging, active-site mutagenesis explaining catalytic inactivity, moderate evidence from single lab with multiple orthogonal methods","pmids":["10581172"],"is_preprint":false},{"year":2002,"finding":"PRIP-2 (PLCL2 paralog, used for comparison) and PRIP-1 (PLCL1 ortholog) both bind Ins(1,4,5)P3 and its parent lipid PI(4,5)P2 via their PH domains, interact with protein phosphatase 1 (PP1) and GABARAP, and are expressed in overlapping brain regions; PRIP-1 preferentially binds Ins(1,4,5)P3 ~10-fold over PI(4,5)P2, whereas PRIP-2 binds both with similar affinity.","method":"Northern blot, in situ hybridization, radioligand binding assays, co-immunoprecipitation","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — radioligand binding and co-IP from single lab; comparative data with PRIP-1 provides context","pmids":["12467885"],"is_preprint":false},{"year":2002,"finding":"PRIP-1 (rat/mouse ortholog of PLCL1) interacts with PP1 catalytic subunit and GABARAP via distinct domains (N-terminus preceding the PH domain for PP1; EF-hand motifs for GABARAP); PRIP-1 inhibits PP1 catalytic activity in a concentration-dependent manner, and competitively inhibits binding of the GABAA receptor γ2 subunit to GABARAP in vitro; PRIP-1 knockout mice show impaired GABAA receptor function.","method":"Yeast two-hybrid, pull-down, far-western, immunoprecipitation, surface plasmon resonance, enzymatic activity assay, electrophysiology in knockout mice","journal":"Nihon yakurigaku zasshi","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal biochemical methods plus functional validation in knockout mice","pmids":["11979730"],"is_preprint":false},{"year":2005,"finding":"PRIP-1 (PLCL1 ortholog) regulates Ins(1,4,5)P3-mediated Ca2+ signaling by binding Ins(1,4,5)P3 through its PH domain, thereby preventing Ins(1,4,5)P3 hydrolysis; in PRIP-1 knockout neurons, Ca2+ responses and Ins(1,4,5)P3 levels are lower due to enhanced activity of type-1 inositol polyphosphate 5-phosphatase, which PRIP-1 physically interacts with and inhibits.","method":"PRIP-1 knockout mouse neurons, Ca2+ imaging, [3H]Ins(1,4,5)P3 labeling, PLC activity assay, in vitro pull-down with PH domain, 5-phosphatase activity assay","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 1-2 — knockout mouse model with multiple orthogonal assays establishing mechanism, replicated across methods in single lab","pmids":["15468068"],"is_preprint":false},{"year":2005,"finding":"PRIP (PLCL1 ortholog) interacts with PP1, PP2A, GABARAP, and the β-subunits of GABAA receptors; PRIP modulates phospho-regulation of GABAA receptor β-subunits through PP1 binding, which is regulated by PKA-dependent phosphorylation of PRIP at threonine 94.","method":"Yeast two-hybrid, pull-down with purified proteins, immunoprecipitation, electrophysiology/behavior in double-knockout mice, phosphatase activity assay","journal":"Molecules and cells","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted interactions with purified proteins plus knockout mouse functional validation","pmids":["16404143"],"is_preprint":false},{"year":2006,"finding":"PRIP (PLCL1 ortholog) controls dynamics of GABAA receptor β-subunit phosphorylation via PP1: PKA-dependent phosphorylation of PRIP reduces PP1 binding but increases PP2A binding, creating a phospho-dependent switch that regulates the dephosphorylation timing of GABAA receptor β3 subunits; PRIP-1/2 double-knockout mice show altered β3 phosphorylation dynamics.","method":"Site-directed mutagenesis, pull-down with purified recombinant proteins, kinase/phosphatase activity assays, cortical neuron culture from double-knockout mice, forskolin stimulation","journal":"Advances in enzyme regulation","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis plus reconstituted binding plus double-KO mouse neurons, multiple orthogonal methods","pmids":["16854455"],"is_preprint":false},{"year":2007,"finding":"PRIP (PLCL1 ortholog) regulates surface expression of GABAA receptors by modulating clathrin/AP2-mediated phospho-regulated endocytosis of the γ2-subunit-containing receptor, acting through its interactions with GABARAP and PP1/PP2A.","method":"Review consolidating data from knockout mouse electrophysiology, receptor trafficking assays, immunoprecipitation, phosphatase assays","journal":"Journal of pharmacological sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — mechanistic synthesis review, underlying data from multiple prior experiments in same research group","pmids":["17690529"],"is_preprint":false},{"year":2013,"finding":"PRIP (PLCL1 ortholog) directly interacts with PP1 and PP2A catalytic subunits via distinct but proximal sites; PKA-dependent phosphorylation of PRIP causes dissociation of PP1 and concurrent recruitment of PP2A in a mutually exclusive, phospho-dependent manner both in vitro and in living cells.","method":"Pull-down with recombinant proteins, site-directed mutagenesis, immunoprecipitation from neuronal cells, cellular treatment with forskolin/isoproterenol","journal":"Advances in biological regulation","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted binding with purified proteins plus mutagenesis plus cell-based validation, moderate evidence","pmids":["23911386"],"is_preprint":false},{"year":2013,"finding":"The C2 domain of PRIP (PLCL1 ortholog) directly interacts with syntaxin 1 and SNAP-25 (but not VAMP2), competes with synaptotagmin I for SNAP-25/syntaxin 1 binding, suppresses SDS-resistant ternary SNARE complex formation, and inhibits high-K+-induced noradrenalin exocytosis from PC12 cells.","method":"In vitro binding assay, co-immunoprecipitation, PC12 cell overexpression, noradrenalin secretion assay, SNARE complex gel assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — direct in vitro binding plus mutagenesis plus functional exocytosis assay with multiple orthogonal methods","pmids":["23341457"],"is_preprint":false},{"year":2012,"finding":"PRIP (PLCL1 ortholog) modulates SNAP-25 phosphorylation and regulated exocytosis: PRIP binds PP1 (via its PP1-binding site) and promotes dephosphorylation of phospho-SNAP-25 by PP1; PRIP expression in PC12 cells accelerates dephosphorylation of SNAP-25 and reduces noradrenalin secretion after PKA or PKC activation; SNAP-25 and PP1 co-precipitate with PRIP.","method":"In vitro dephosphorylation assay with purified proteins, PC12 cell overexpression with noradrenalin secretion, anti-PRIP immunoprecipitation, PP1-binding mutant (F97A) comparison","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted in vitro assay plus mutagenesis plus cell-based functional readout","pmids":["22311984"],"is_preprint":false},{"year":2014,"finding":"PRIP (PLCL1 ortholog) controls KIF5B-mediated insulin secretory vesicle transport by sequestering GABARAP; PRIP knockdown frees GABARAP to associate with insulin vesicles, increasing KIF5B–vesicle co-localization and vesicle mobility, resulting in enhanced insulin secretion from MIN6 cells.","method":"siRNA knockdown in MIN6 insulinoma cells, GFP-phogrin live imaging, double immunofluorescence, density gradient fractionation, interference peptide experiments","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal cell-biology methods (imaging, fractionation, knockdown, interference peptide) with defined mechanistic pathway","pmids":["24812354"],"is_preprint":false},{"year":2014,"finding":"PRIP (PLCL1 ortholog) promotes translocation of PP2A to lipid droplets in adipocytes in response to adrenaline, facilitating dephosphorylation of hormone-sensitive lipase (HSL) and perilipin A and thereby reducing PKA-mediated lipolysis; PRIP-KO mice show reduced body fat, elevated HSL phosphorylation, reduced PP2A translocation to lipid droplets, and increased lipolysis.","method":"PRIP-KO mouse adipose tissue, subcellular fractionation, phospho-HSL western blot, glycerol/NEFA lipolysis assay, phosphatase inhibitor treatment, adrenaline stimulation","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — knockout mouse model with fractionation and functional assays; multiple orthogonal methods","pmids":["24945349"],"is_preprint":false},{"year":2016,"finding":"PLCL1 (PRIP-1) is induced by progesterone signaling in decidualizing human endometrial stromal cells (HESCs); PRIP-1 maintains basal PI3K/AKT activity (preventing FOX01 nuclear translocation and BIM-mediated apoptosis) in undifferentiated HESCs, and in decidual cells it uncouples PLC activation from intracellular Ca2+ release by attenuating Ins(1,4,5)P3 signaling downstream of Gq-coupled receptors.","method":"siRNA knockdown in HESCs, western blot for AKT/FOXO1/BIM, Ca2+ imaging, progesterone treatment, differentiation marker assays","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 — siRNA knockdown with multiple pathway readouts and functional Ca2+ imaging in primary human cells","pmids":["27167772"],"is_preprint":false},{"year":2017,"finding":"PRIP (PLCL1 ortholog) promotes osteoclast differentiation through calcium-calcineurin-NFATc1 signaling: PRIP-KO mice show reduced osteoclast numbers, lower calcineurin expression and activity, reduced M-CSF-induced intracellular Ca2+ changes, and impaired NFATc1 nuclear localization; restoring intracellular Ca2+ rescues osteoclastogenesis in KO cells.","method":"PRIP-KO mouse orthodontic tooth movement model, histomorphometry, osteoclast differentiation assay, flow cytometry, Ca2+ imaging, calcineurin activity assay, NFATc1 immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO model plus multiple mechanistic in vitro assays with rescue experiment","pmids":["28341745"],"is_preprint":false},{"year":2011,"finding":"PRIP (PLCL1 ortholog) negatively regulates bone formation: PRIP-KO mice show increased bone mineral density, elevated osteoblast differentiation markers (alkaline phosphatase, osteogenic genes), and prolonged BMP-induced Smad1/5/8 phosphorylation in calvaria-derived osteoblasts.","method":"PRIP-KO mouse 3D femur micro-CT, histomorphometry, primary calvaria osteoblast culture, alkaline phosphatase assay, Smad phosphorylation western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO model with detailed bone phenotyping plus in vitro mechanistic assays","pmids":["21757756"],"is_preprint":false},{"year":2015,"finding":"PRIP (PLCL1 ortholog) modulates BMP/Smad signaling in osteoblasts: in PRIP-deficient calvaria cells, BMP-induced Smad1/5 phosphorylation is enhanced; PRIP acts by facilitating methylation (via methyltransferase DB867-sensitive activity) and nuclear retention of inhibitory Smad6, which dampens BMP-receptor signaling.","method":"Primary calvaria cell culture from PRIP-KO mice, luciferase assay (Id1 promoter/Smad1 constitutively active), western blot for Smad1/5 phosphorylation, DB867 inhibitor treatment, Smad6 localization by immunofluorescence","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — KO mouse cells with multiple assays; mechanistic pathway proposed but inhibitor specificity limits certainty","pmids":["25981537"],"is_preprint":false},{"year":2019,"finding":"PLCL1 promotes tumor cell 'slimming' in clear cell renal cell carcinoma (ccRCC) by improving the protein stability of UCP1 through reducing UCP1 ubiquitination; PLCL1-mediated UCP1 activation drives lipid browning, consuming lipid droplets without ATP production, and suppresses tumor progression.","method":"PLCL1 overexpression/restoration in ccRCC cells, lipid droplet imaging, tumor xenograft, UCP1 protein stability/ubiquitination assay, TCGA bioinformatics","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2-3 — cell-based overexpression with ubiquitination assay and xenograft; single lab","pmids":["31131187"],"is_preprint":false},{"year":2021,"finding":"PRIP (PLCL1 ortholog) competes with PI3K for PI(4,5)P2 substrate, thereby attenuating PI3K/AKT/GSK3β signaling, reducing cyclin D1 accumulation, and suppressing cell cycle progression and tumor growth; stable PLCL1/PRIP expression in MCF-7 breast cancer cells reduces AKT/GSK3β phosphorylation and inhibits xenograft tumor growth in mice.","method":"PRIP siRNA knockdown and stable overexpression in MCF-7 cells, PI(3,4,5)P3 immunofluorescence, western blot for AKT/GSK3β/cyclin D1, flow cytometry cell cycle analysis, xenograft mouse model","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — stable overexpression plus KD with multiple orthogonal assays plus in vivo xenograft model","pmids":["33743346"],"is_preprint":false},{"year":2022,"finding":"PLCL1 promotes inflammation in rheumatoid arthritis fibroblast-like synoviocytes (FLS) via NLRP3 inflammasome activation: PLCL1 silencing reduces IL-6, IL-1β, and CXCL8 levels after TNF-α stimulation; PLCL1 overexpression increases these cytokines; NLRP3 inhibitor INF39 counteracts the pro-inflammatory effect of PLCL1 overexpression.","method":"siRNA knockdown and plasmid overexpression in RA-FLS, TNF-α stimulation, western blot, qPCR, ELISA, NLRP3 inhibitor (INF39) epistasis","journal":"Advances in rheumatology","confidence":"Medium","confidence_rationale":"Tier 2-3 — genetic epistasis with NLRP3 inhibitor plus gain/loss-of-function; single lab","pmids":["35820936"],"is_preprint":false},{"year":2023,"finding":"PLCL1 suppresses renal cell carcinoma progression by activating the AMPK/mTOR pathway, inducing autophagy, and promoting apoptosis; PLCL1 interacts with DEPP (decidual protein induced by progesterone) as identified by transcriptional analysis and western blot.","method":"Stable PLCL1 overexpression in 786-O cells, wound healing, transwell, flow cytometry, western blot for AMPK/mTOR/autophagy markers, co-immunoprecipitation with DEPP","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2-3 — cell-based overexpression/KD with pathway assays and co-IP for DEPP; single lab","pmids":["37801481"],"is_preprint":false},{"year":2025,"finding":"LCOR interacts with transcriptional repressor RUNX1 to relieve RUNX1-mediated repression of PLCL1 in ccRCC; PLCL1 in turn inhibits tumor progression and lipid accumulation via UCP1-mediated lipid browning and activates p38 phosphorylation to facilitate apoptosis.","method":"Bioinformatics, in vitro/in vivo experiments, LCOR-RUNX1 interaction assay, PLCL1 overexpression/KD in ccRCC cells, p38 phosphorylation western blot, xenograft","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — mechanistic pathway from single lab with in vitro and in vivo data","pmids":["40083699"],"is_preprint":false},{"year":2026,"finding":"PRIP/PLCL1 deficiency enhances TGF-β1-induced fibroblast activation and organ fibrosis; mechanistically, loss of PRIP activates AKT, promotes MST2 phosphorylation at Thr117, and facilitates nuclear translocation of YAP (Hippo pathway effector), driving profibrotic gene expression; in vivo, PRIP-KO mice show accelerated kidney and heart fibrosis after angiotensin II treatment.","method":"Prip-KO mouse angiotensin II fibrosis model, MEF culture with TGF-β1, qPCR, western blot for AKT/MST2/YAP, YAP nuclear localization assay, GSEA bioinformatics","journal":"Cell communication and signaling","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO model plus in vitro MEF experiments with multiple signaling readouts and bioinformatics validation","pmids":["41680862"],"is_preprint":false},{"year":2025,"finding":"Plcl1 is selectively enriched in the most quiescent hematopoietic stem cell (HSC) subset and regulates intracellular calcium dynamics; Plcl1 deficiency reduces basal Ca2+ levels, diminishes calcium-responsive immediate-early gene induction, skews HSCs toward CD41+ subsets at steady state, amplifies platelet rebound and non-canonical megakaryocyte progenitor expansion under stress, and exacerbates aging-associated HSC features.","method":"Plcl1-KO mouse model, intracellular Ca2+ imaging in HSCs, flow cytometry, competitive reconstitution assay, gene expression analysis of Ca2+-responsive genes","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — KO mouse with Ca2+ imaging and functional reconstitution; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true}],"current_model":"PLCL1/PRIP is a catalytically inactive PLC-δ1-like scaffold protein that binds Ins(1,4,5)P3 and PI(4,5)P2 through its PH domain to attenuate IP3-mediated Ca2+ signaling; it acts as a phospho-regulated scaffold that binds PP1 and PP2A in a mutually exclusive, PKA-dependent manner to control dephosphorylation of GABAA receptor subunits, SNAP-25, HSL, and Smad proteins; its C2 domain directly binds syntaxin 1 and SNAP-25 to inhibit SNARE complex formation and exocytosis; it sequesters GABARAP to regulate KIF5B-driven vesicle transport and insulin secretion; it competes with PI3K for PI(4,5)P2 to suppress AKT signaling, cell cycle progression, and fibrosis (via PI3K-AKT-MST2-YAP); it stabilizes UCP1 protein by reducing ubiquitination to drive lipid browning in renal cancer; and in hematopoietic stem cells it modulates intracellular calcium dynamics to restrain megakaryocytic priming and preserve quiescence."},"narrative":{"teleology":[{"year":1999,"claim":"Establishing that PLCL1 is a catalytically dead PLC-δ homolog whose PH domain binds IP3 and PIP2 resolved the paradox of a PLC-like protein that cannot hydrolyze lipids and reframed it as a signaling scaffold.","evidence":"Biochemical binding assays, GFP-fusion imaging, and active-site mutagenesis in COS7 and myoblast cells","pmids":["10581172"],"confidence":"High","gaps":["No structural basis for catalytic inactivity beyond sequence comparison","Endogenous protein levels and tissue distribution incompletely mapped"]},{"year":2002,"claim":"Identification of PP1, PP2A, and GABARAP as direct binding partners of PLCL1 established it as a phosphatase-targeting scaffold with a role in GABAA receptor regulation, explaining altered GABAergic transmission in KO mice.","evidence":"Yeast two-hybrid, pull-down, surface plasmon resonance, PP1 activity assays, and PRIP-1 knockout mouse electrophysiology","pmids":["11979730","12467885"],"confidence":"High","gaps":["Structural basis for simultaneous versus mutually exclusive PP1/GABARAP binding unknown","In vivo stoichiometry of PLCL1–PP1 complex not determined"]},{"year":2005,"claim":"Demonstrating that PLCL1 shields IP3 from 5-phosphatase degradation in neurons showed it sustains IP3 pools rather than simply sequestering them, providing a mechanism for the reduced Ca²⁺ responses in KO neurons.","evidence":"PRIP-1 KO mouse neurons with Ca²⁺ imaging, [³H]IP3 labeling, and 5-phosphatase activity assays","pmids":["15468068"],"confidence":"High","gaps":["Identity of the 5-phosphatase isoform protected by PLCL1 not fully resolved","Whether PLCL1 also modulates IP3 receptor gating directly remains untested"]},{"year":2006,"claim":"Revealing that PKA phosphorylation of PLCL1 triggers a PP1-to-PP2A switch established a phospho-dependent scaffold mechanism that temporally controls GABAA receptor β3-subunit dephosphorylation and surface expression.","evidence":"Site-directed mutagenesis, reconstituted binding with purified proteins, and double-KO mouse cortical neurons with forskolin stimulation","pmids":["16854455","16404143","17690529"],"confidence":"High","gaps":["Kinetics of the PP1/PP2A switch in intact synapses not measured","Whether other kinases besides PKA trigger the switch is unknown"]},{"year":2011,"claim":"Showing that PLCL1 loss enhances BMP-induced Smad1/5/8 phosphorylation and increases bone mineral density extended its scaffold role beyond GABAergic signaling into TGF-β superfamily regulation of osteoblast differentiation.","evidence":"PRIP-KO mouse micro-CT bone phenotyping and primary calvaria osteoblast Smad phosphorylation assays","pmids":["21757756","25981537"],"confidence":"High","gaps":["Direct physical interaction between PLCL1 and Smad6 or BMP receptors not shown","Mechanism of PLCL1-facilitated Smad6 methylation relies on poorly characterized inhibitor"]},{"year":2012,"claim":"Discovery that the C2 domain binds syntaxin 1 and SNAP-25 to inhibit SNARE complex formation, and that PLCL1 recruits PP1 to dephosphorylate SNAP-25, established a dual mechanism for suppressing regulated exocytosis.","evidence":"In vitro binding, co-IP, SNARE complex gel assay, and noradrenalin secretion from PC12 cells with PP1-binding mutant controls","pmids":["22311984","23341457"],"confidence":"High","gaps":["Whether both C2-domain SNARE binding and PP1-mediated SNAP-25 dephosphorylation operate in the same cell type simultaneously is unclear","Physiological relevance for neurotransmitter release in vivo not tested"]},{"year":2013,"claim":"Biochemical reconstitution of mutually exclusive PP1 and PP2A binding to PLCL1 in living cells confirmed the phospho-switch model and generalized it beyond GABAA receptors.","evidence":"Pull-down with purified proteins, mutagenesis, and immunoprecipitation from neuronal cells treated with forskolin/isoproterenol","pmids":["23911386"],"confidence":"High","gaps":["Crystal structure of PLCL1–PP1 and PLCL1–PP2A interfaces not available","Full inventory of substrates regulated by the switch is incomplete"]},{"year":2014,"claim":"Showing that PLCL1 sequesters GABARAP from insulin vesicles to limit KIF5B-driven transport, and separately translocates PP2A to lipid droplets to reduce lipolysis, broadened its scaffold functions to metabolic regulation in pancreatic β-cells and adipocytes.","evidence":"siRNA knockdown in MIN6 cells with live imaging of insulin vesicles; PRIP-KO mouse adipose tissue fractionation and lipolysis assays","pmids":["24812354","24945349"],"confidence":"High","gaps":["Whether PLCL1–GABARAP interaction is regulated by phosphorylation like PP1 binding is unknown","Relative contribution of PLCL1 to whole-body lipid homeostasis versus other regulators not quantified"]},{"year":2017,"claim":"Demonstration that PLCL1 promotes osteoclastogenesis through calcium–calcineurin–NFATc1 signaling, with rescue by exogenous Ca²⁺, showed its IP3/Ca²⁺ buffering function operates in opposite directions in osteoblasts versus osteoclasts.","evidence":"PRIP-KO mouse orthodontic tooth movement model, osteoclast differentiation, calcineurin activity, and Ca²⁺ imaging with rescue","pmids":["28341745"],"confidence":"High","gaps":["How PLCL1 simultaneously promotes and inhibits Ca²⁺ signaling in different bone lineages is mechanistically unresolved"]},{"year":2019,"claim":"Finding that PLCL1 stabilizes UCP1 by reducing its ubiquitination in clear cell renal carcinoma introduced a non-canonical function in protein quality control and lipid browning distinct from its classical IP3/phosphatase roles.","evidence":"PLCL1 overexpression in ccRCC cells, ubiquitination assay, lipid droplet imaging, and tumor xenograft","pmids":["31131187"],"confidence":"Medium","gaps":["The E3 ligase counteracted by PLCL1 is not identified","Whether PLCL1 directly binds UCP1 or acts indirectly through signaling is unresolved","Single-lab finding awaits independent confirmation"]},{"year":2021,"claim":"Demonstrating that PLCL1 competes with PI3K for PIP2 substrate to suppress AKT/GSK3β/cyclin D1 signaling and tumor growth unified its PH-domain lipid-binding function with tumor-suppressive activity.","evidence":"PLCL1 overexpression and knockdown in MCF-7 cells, PIP3 immunofluorescence, cell cycle analysis, and xenograft model","pmids":["33743346"],"confidence":"High","gaps":["Direct measurement of PIP2 consumption or PI3K displacement at the membrane not performed","Generality across cancer types beyond breast cancer not established at the time"]},{"year":2025,"claim":"Linking PLCL1 loss to AKT-driven MST2 phosphorylation and YAP nuclear translocation in a fibrosis model connected its PIP2-sequestration function to the Hippo pathway and organ fibrosis in vivo.","evidence":"PRIP-KO mouse angiotensin II fibrosis model, MEF TGF-β1 treatment, AKT/MST2/YAP western blots, and YAP nuclear localization","pmids":["41680862"],"confidence":"High","gaps":["Whether PLCL1 directly interacts with MST2 or YAP or acts entirely through AKT is unknown","Therapeutic potential of restoring PLCL1 in fibrosis not assessed"]},{"year":null,"claim":"Key unresolved questions include the structural basis for PLCL1's mutually exclusive PP1/PP2A binding, the mechanism by which PLCL1 reduces UCP1 ubiquitination, and whether its calcium-regulatory function in quiescent HSCs operates through IP3 sequestration, PIP2 competition, or both.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of PLCL1 or its complexes exists","HSC calcium regulatory mechanism is from a single preprint and awaits peer review","Complete substrate inventory for PLCL1-scaffolded PP1/PP2A is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,1,3,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,4,5,7,9,10,11]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,5,7,8,17,21]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7,9]},{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,5,12,13,17,21]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,4,5,6]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[8,9,10]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[11,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[14,15]}],"complexes":[],"partners":["PPP1CA","PPP2CA","GABARAP","SNAP25","STX1A","GABRB3","GABRG2","DEPP1"],"other_free_text":[]},"mechanistic_narrative":"PLCL1 (also called PRIP-1) is a catalytically inactive phospholipase C-δ1-like scaffold protein that integrates inositol phosphate signaling, protein phosphatase targeting, and SNARE-dependent exocytosis to regulate calcium dynamics, receptor trafficking, and cell fate across diverse tissues. Its PH domain binds Ins(1,4,5)P3 and PI(4,5)P2 to attenuate IP3-mediated Ca²⁺ release and to compete with PI3K for PI(4,5)P2 substrate, thereby suppressing AKT signaling, cell cycle progression, and fibrosis via the PI3K–AKT–MST2–YAP axis [PMID:10581172, PMID:15468068, PMID:33743346, PMID:41680862]. PLCL1 functions as a PKA-regulated phospho-switch that binds PP1 and PP2A in a mutually exclusive manner to control dephosphorylation of GABAA receptor β-subunits, SNAP-25, and hormone-sensitive lipase, while its C2 domain directly engages syntaxin 1 and SNAP-25 to inhibit SNARE complex assembly and exocytosis [PMID:23911386, PMID:22311984, PMID:23341457, PMID:24945349]. Through GABARAP sequestration it restrains KIF5B-driven insulin vesicle transport, and through modulation of BMP–Smad signaling it negatively regulates osteoblast differentiation, while promoting osteoclastogenesis via calcineurin–NFATc1 [PMID:24812354, PMID:21757756, PMID:28341745]."},"prefetch_data":{"uniprot":{"accession":"Q15111","full_name":"Inactive phospholipase C-like protein 1","aliases":["Phospholipase C-deleted in lung carcinoma","Phospholipase C-related but catalytically inactive protein","PRIP"],"length_aa":1095,"mass_kda":122.7,"function":"Involved in an inositol phospholipid-based intracellular signaling cascade. Shows no PLC activity to phosphatidylinositol 4,5-bisphosphate and phosphatidylinositol. Component in the phospho-dependent endocytosis process of GABA A receptor (By similarity). Regulates the turnover of receptors and thus contributes to the maintenance of GABA-mediated synaptic inhibition. Its aberrant expression could contribute to the genesis and progression of lung carcinoma. 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Folia pharmacologica Japonica","url":"https://pubmed.ncbi.nlm.nih.gov/11979730","citation_count":1,"is_preprint":false},{"pmid":"39300709","id":"PMC_39300709","title":"RBPMS-AS1 sponges miR-19a-3p to restrain cervical cancer cells via enhancing PLCL1-mediated pyroptosis.","date":"2024","source":"Biotechnology and applied biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/39300709","citation_count":1,"is_preprint":false},{"pmid":"40334262","id":"PMC_40334262","title":"Preparation, Physicochemical Characterization, and In Vitro and In Vivo Osteogenic Evaluation of Reinforced PLLA-PLCL/HA Resorbable Membranes.","date":"2025","source":"Journal of biomedical materials research. 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Polymer edition","url":"https://pubmed.ncbi.nlm.nih.gov/40523307","citation_count":0,"is_preprint":false},{"pmid":"40900915","id":"PMC_40900915","title":"The endothelial layer formation in the presence of AuNPs/CdSe/TaNPs-loaded PLCL/PVP-based electrospun nanofibers.","date":"2025","source":"Frontiers in molecular biosciences","url":"https://pubmed.ncbi.nlm.nih.gov/40900915","citation_count":0,"is_preprint":false},{"pmid":"41401356","id":"PMC_41401356","title":"Comparative Physicochemical Characterization of Electrospun PCL, PLLA, and PLCL Scaffolds and Cell Responses for Tissue Engineering Applications.","date":"2025","source":"Macromolecular bioscience","url":"https://pubmed.ncbi.nlm.nih.gov/41401356","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.09.15.674672","title":"Plcl1 Regulates Hematopoietic Stem Cell Function During Aging and Stress by Modulating Calcium Dynamics","date":"2025-09-16","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.15.674672","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.07.17.660811","title":"Genome-wide association study of cocaine self-administration behavior in Heterogeneous Stock rats","date":"2025-07-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.17.660811","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.06.19.660635","title":"Downregulation of LATS1/2 Drives Endothelial Senescence-Associated Stemness (SAS) and Atherothrombotic Lesion Formation","date":"2025-06-21","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.19.660635","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52702,"output_tokens":6325,"usd":0.126491},"stage2":{"model":"claude-opus-4-6","input_tokens":9922,"output_tokens":3509,"usd":0.206003},"total_usd":0.332494,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"PLCL1 (PLC-L2) was identified as a catalytically inactive phospholipase C-like protein; its PH domain binds strongly to PI(4,5)P2 and Ins(1,4,5)P3, and it localizes predominantly to perinuclear/endoplasmic reticulum areas in myoblast, myotube, and COS7 cells, suggesting a role in regulating Ins(1,4,5)P3 signaling near the ER.\",\n      \"method\": \"Biochemical binding assays, GFP-fusion live-cell imaging, subcellular fractionation, mutagenesis of catalytic residues\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct in vitro binding assays plus live imaging, active-site mutagenesis explaining catalytic inactivity, moderate evidence from single lab with multiple orthogonal methods\",\n      \"pmids\": [\"10581172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PRIP-2 (PLCL2 paralog, used for comparison) and PRIP-1 (PLCL1 ortholog) both bind Ins(1,4,5)P3 and its parent lipid PI(4,5)P2 via their PH domains, interact with protein phosphatase 1 (PP1) and GABARAP, and are expressed in overlapping brain regions; PRIP-1 preferentially binds Ins(1,4,5)P3 ~10-fold over PI(4,5)P2, whereas PRIP-2 binds both with similar affinity.\",\n      \"method\": \"Northern blot, in situ hybridization, radioligand binding assays, co-immunoprecipitation\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — radioligand binding and co-IP from single lab; comparative data with PRIP-1 provides context\",\n      \"pmids\": [\"12467885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PRIP-1 (rat/mouse ortholog of PLCL1) interacts with PP1 catalytic subunit and GABARAP via distinct domains (N-terminus preceding the PH domain for PP1; EF-hand motifs for GABARAP); PRIP-1 inhibits PP1 catalytic activity in a concentration-dependent manner, and competitively inhibits binding of the GABAA receptor γ2 subunit to GABARAP in vitro; PRIP-1 knockout mice show impaired GABAA receptor function.\",\n      \"method\": \"Yeast two-hybrid, pull-down, far-western, immunoprecipitation, surface plasmon resonance, enzymatic activity assay, electrophysiology in knockout mice\",\n      \"journal\": \"Nihon yakurigaku zasshi\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal biochemical methods plus functional validation in knockout mice\",\n      \"pmids\": [\"11979730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PRIP-1 (PLCL1 ortholog) regulates Ins(1,4,5)P3-mediated Ca2+ signaling by binding Ins(1,4,5)P3 through its PH domain, thereby preventing Ins(1,4,5)P3 hydrolysis; in PRIP-1 knockout neurons, Ca2+ responses and Ins(1,4,5)P3 levels are lower due to enhanced activity of type-1 inositol polyphosphate 5-phosphatase, which PRIP-1 physically interacts with and inhibits.\",\n      \"method\": \"PRIP-1 knockout mouse neurons, Ca2+ imaging, [3H]Ins(1,4,5)P3 labeling, PLC activity assay, in vitro pull-down with PH domain, 5-phosphatase activity assay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — knockout mouse model with multiple orthogonal assays establishing mechanism, replicated across methods in single lab\",\n      \"pmids\": [\"15468068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PRIP (PLCL1 ortholog) interacts with PP1, PP2A, GABARAP, and the β-subunits of GABAA receptors; PRIP modulates phospho-regulation of GABAA receptor β-subunits through PP1 binding, which is regulated by PKA-dependent phosphorylation of PRIP at threonine 94.\",\n      \"method\": \"Yeast two-hybrid, pull-down with purified proteins, immunoprecipitation, electrophysiology/behavior in double-knockout mice, phosphatase activity assay\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted interactions with purified proteins plus knockout mouse functional validation\",\n      \"pmids\": [\"16404143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PRIP (PLCL1 ortholog) controls dynamics of GABAA receptor β-subunit phosphorylation via PP1: PKA-dependent phosphorylation of PRIP reduces PP1 binding but increases PP2A binding, creating a phospho-dependent switch that regulates the dephosphorylation timing of GABAA receptor β3 subunits; PRIP-1/2 double-knockout mice show altered β3 phosphorylation dynamics.\",\n      \"method\": \"Site-directed mutagenesis, pull-down with purified recombinant proteins, kinase/phosphatase activity assays, cortical neuron culture from double-knockout mice, forskolin stimulation\",\n      \"journal\": \"Advances in enzyme regulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis plus reconstituted binding plus double-KO mouse neurons, multiple orthogonal methods\",\n      \"pmids\": [\"16854455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PRIP (PLCL1 ortholog) regulates surface expression of GABAA receptors by modulating clathrin/AP2-mediated phospho-regulated endocytosis of the γ2-subunit-containing receptor, acting through its interactions with GABARAP and PP1/PP2A.\",\n      \"method\": \"Review consolidating data from knockout mouse electrophysiology, receptor trafficking assays, immunoprecipitation, phosphatase assays\",\n      \"journal\": \"Journal of pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — mechanistic synthesis review, underlying data from multiple prior experiments in same research group\",\n      \"pmids\": [\"17690529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PRIP (PLCL1 ortholog) directly interacts with PP1 and PP2A catalytic subunits via distinct but proximal sites; PKA-dependent phosphorylation of PRIP causes dissociation of PP1 and concurrent recruitment of PP2A in a mutually exclusive, phospho-dependent manner both in vitro and in living cells.\",\n      \"method\": \"Pull-down with recombinant proteins, site-directed mutagenesis, immunoprecipitation from neuronal cells, cellular treatment with forskolin/isoproterenol\",\n      \"journal\": \"Advances in biological regulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted binding with purified proteins plus mutagenesis plus cell-based validation, moderate evidence\",\n      \"pmids\": [\"23911386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The C2 domain of PRIP (PLCL1 ortholog) directly interacts with syntaxin 1 and SNAP-25 (but not VAMP2), competes with synaptotagmin I for SNAP-25/syntaxin 1 binding, suppresses SDS-resistant ternary SNARE complex formation, and inhibits high-K+-induced noradrenalin exocytosis from PC12 cells.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, PC12 cell overexpression, noradrenalin secretion assay, SNARE complex gel assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct in vitro binding plus mutagenesis plus functional exocytosis assay with multiple orthogonal methods\",\n      \"pmids\": [\"23341457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PRIP (PLCL1 ortholog) modulates SNAP-25 phosphorylation and regulated exocytosis: PRIP binds PP1 (via its PP1-binding site) and promotes dephosphorylation of phospho-SNAP-25 by PP1; PRIP expression in PC12 cells accelerates dephosphorylation of SNAP-25 and reduces noradrenalin secretion after PKA or PKC activation; SNAP-25 and PP1 co-precipitate with PRIP.\",\n      \"method\": \"In vitro dephosphorylation assay with purified proteins, PC12 cell overexpression with noradrenalin secretion, anti-PRIP immunoprecipitation, PP1-binding mutant (F97A) comparison\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted in vitro assay plus mutagenesis plus cell-based functional readout\",\n      \"pmids\": [\"22311984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PRIP (PLCL1 ortholog) controls KIF5B-mediated insulin secretory vesicle transport by sequestering GABARAP; PRIP knockdown frees GABARAP to associate with insulin vesicles, increasing KIF5B–vesicle co-localization and vesicle mobility, resulting in enhanced insulin secretion from MIN6 cells.\",\n      \"method\": \"siRNA knockdown in MIN6 insulinoma cells, GFP-phogrin live imaging, double immunofluorescence, density gradient fractionation, interference peptide experiments\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal cell-biology methods (imaging, fractionation, knockdown, interference peptide) with defined mechanistic pathway\",\n      \"pmids\": [\"24812354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PRIP (PLCL1 ortholog) promotes translocation of PP2A to lipid droplets in adipocytes in response to adrenaline, facilitating dephosphorylation of hormone-sensitive lipase (HSL) and perilipin A and thereby reducing PKA-mediated lipolysis; PRIP-KO mice show reduced body fat, elevated HSL phosphorylation, reduced PP2A translocation to lipid droplets, and increased lipolysis.\",\n      \"method\": \"PRIP-KO mouse adipose tissue, subcellular fractionation, phospho-HSL western blot, glycerol/NEFA lipolysis assay, phosphatase inhibitor treatment, adrenaline stimulation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knockout mouse model with fractionation and functional assays; multiple orthogonal methods\",\n      \"pmids\": [\"24945349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PLCL1 (PRIP-1) is induced by progesterone signaling in decidualizing human endometrial stromal cells (HESCs); PRIP-1 maintains basal PI3K/AKT activity (preventing FOX01 nuclear translocation and BIM-mediated apoptosis) in undifferentiated HESCs, and in decidual cells it uncouples PLC activation from intracellular Ca2+ release by attenuating Ins(1,4,5)P3 signaling downstream of Gq-coupled receptors.\",\n      \"method\": \"siRNA knockdown in HESCs, western blot for AKT/FOXO1/BIM, Ca2+ imaging, progesterone treatment, differentiation marker assays\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with multiple pathway readouts and functional Ca2+ imaging in primary human cells\",\n      \"pmids\": [\"27167772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PRIP (PLCL1 ortholog) promotes osteoclast differentiation through calcium-calcineurin-NFATc1 signaling: PRIP-KO mice show reduced osteoclast numbers, lower calcineurin expression and activity, reduced M-CSF-induced intracellular Ca2+ changes, and impaired NFATc1 nuclear localization; restoring intracellular Ca2+ rescues osteoclastogenesis in KO cells.\",\n      \"method\": \"PRIP-KO mouse orthodontic tooth movement model, histomorphometry, osteoclast differentiation assay, flow cytometry, Ca2+ imaging, calcineurin activity assay, NFATc1 immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO model plus multiple mechanistic in vitro assays with rescue experiment\",\n      \"pmids\": [\"28341745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PRIP (PLCL1 ortholog) negatively regulates bone formation: PRIP-KO mice show increased bone mineral density, elevated osteoblast differentiation markers (alkaline phosphatase, osteogenic genes), and prolonged BMP-induced Smad1/5/8 phosphorylation in calvaria-derived osteoblasts.\",\n      \"method\": \"PRIP-KO mouse 3D femur micro-CT, histomorphometry, primary calvaria osteoblast culture, alkaline phosphatase assay, Smad phosphorylation western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO model with detailed bone phenotyping plus in vitro mechanistic assays\",\n      \"pmids\": [\"21757756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PRIP (PLCL1 ortholog) modulates BMP/Smad signaling in osteoblasts: in PRIP-deficient calvaria cells, BMP-induced Smad1/5 phosphorylation is enhanced; PRIP acts by facilitating methylation (via methyltransferase DB867-sensitive activity) and nuclear retention of inhibitory Smad6, which dampens BMP-receptor signaling.\",\n      \"method\": \"Primary calvaria cell culture from PRIP-KO mice, luciferase assay (Id1 promoter/Smad1 constitutively active), western blot for Smad1/5 phosphorylation, DB867 inhibitor treatment, Smad6 localization by immunofluorescence\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse cells with multiple assays; mechanistic pathway proposed but inhibitor specificity limits certainty\",\n      \"pmids\": [\"25981537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PLCL1 promotes tumor cell 'slimming' in clear cell renal cell carcinoma (ccRCC) by improving the protein stability of UCP1 through reducing UCP1 ubiquitination; PLCL1-mediated UCP1 activation drives lipid browning, consuming lipid droplets without ATP production, and suppresses tumor progression.\",\n      \"method\": \"PLCL1 overexpression/restoration in ccRCC cells, lipid droplet imaging, tumor xenograft, UCP1 protein stability/ubiquitination assay, TCGA bioinformatics\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — cell-based overexpression with ubiquitination assay and xenograft; single lab\",\n      \"pmids\": [\"31131187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRIP (PLCL1 ortholog) competes with PI3K for PI(4,5)P2 substrate, thereby attenuating PI3K/AKT/GSK3β signaling, reducing cyclin D1 accumulation, and suppressing cell cycle progression and tumor growth; stable PLCL1/PRIP expression in MCF-7 breast cancer cells reduces AKT/GSK3β phosphorylation and inhibits xenograft tumor growth in mice.\",\n      \"method\": \"PRIP siRNA knockdown and stable overexpression in MCF-7 cells, PI(3,4,5)P3 immunofluorescence, western blot for AKT/GSK3β/cyclin D1, flow cytometry cell cycle analysis, xenograft mouse model\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — stable overexpression plus KD with multiple orthogonal assays plus in vivo xenograft model\",\n      \"pmids\": [\"33743346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PLCL1 promotes inflammation in rheumatoid arthritis fibroblast-like synoviocytes (FLS) via NLRP3 inflammasome activation: PLCL1 silencing reduces IL-6, IL-1β, and CXCL8 levels after TNF-α stimulation; PLCL1 overexpression increases these cytokines; NLRP3 inhibitor INF39 counteracts the pro-inflammatory effect of PLCL1 overexpression.\",\n      \"method\": \"siRNA knockdown and plasmid overexpression in RA-FLS, TNF-α stimulation, western blot, qPCR, ELISA, NLRP3 inhibitor (INF39) epistasis\",\n      \"journal\": \"Advances in rheumatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genetic epistasis with NLRP3 inhibitor plus gain/loss-of-function; single lab\",\n      \"pmids\": [\"35820936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PLCL1 suppresses renal cell carcinoma progression by activating the AMPK/mTOR pathway, inducing autophagy, and promoting apoptosis; PLCL1 interacts with DEPP (decidual protein induced by progesterone) as identified by transcriptional analysis and western blot.\",\n      \"method\": \"Stable PLCL1 overexpression in 786-O cells, wound healing, transwell, flow cytometry, western blot for AMPK/mTOR/autophagy markers, co-immunoprecipitation with DEPP\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — cell-based overexpression/KD with pathway assays and co-IP for DEPP; single lab\",\n      \"pmids\": [\"37801481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LCOR interacts with transcriptional repressor RUNX1 to relieve RUNX1-mediated repression of PLCL1 in ccRCC; PLCL1 in turn inhibits tumor progression and lipid accumulation via UCP1-mediated lipid browning and activates p38 phosphorylation to facilitate apoptosis.\",\n      \"method\": \"Bioinformatics, in vitro/in vivo experiments, LCOR-RUNX1 interaction assay, PLCL1 overexpression/KD in ccRCC cells, p38 phosphorylation western blot, xenograft\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — mechanistic pathway from single lab with in vitro and in vivo data\",\n      \"pmids\": [\"40083699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"PRIP/PLCL1 deficiency enhances TGF-β1-induced fibroblast activation and organ fibrosis; mechanistically, loss of PRIP activates AKT, promotes MST2 phosphorylation at Thr117, and facilitates nuclear translocation of YAP (Hippo pathway effector), driving profibrotic gene expression; in vivo, PRIP-KO mice show accelerated kidney and heart fibrosis after angiotensin II treatment.\",\n      \"method\": \"Prip-KO mouse angiotensin II fibrosis model, MEF culture with TGF-β1, qPCR, western blot for AKT/MST2/YAP, YAP nuclear localization assay, GSEA bioinformatics\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO model plus in vitro MEF experiments with multiple signaling readouts and bioinformatics validation\",\n      \"pmids\": [\"41680862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Plcl1 is selectively enriched in the most quiescent hematopoietic stem cell (HSC) subset and regulates intracellular calcium dynamics; Plcl1 deficiency reduces basal Ca2+ levels, diminishes calcium-responsive immediate-early gene induction, skews HSCs toward CD41+ subsets at steady state, amplifies platelet rebound and non-canonical megakaryocyte progenitor expansion under stress, and exacerbates aging-associated HSC features.\",\n      \"method\": \"Plcl1-KO mouse model, intracellular Ca2+ imaging in HSCs, flow cytometry, competitive reconstitution assay, gene expression analysis of Ca2+-responsive genes\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with Ca2+ imaging and functional reconstitution; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"PLCL1/PRIP is a catalytically inactive PLC-δ1-like scaffold protein that binds Ins(1,4,5)P3 and PI(4,5)P2 through its PH domain to attenuate IP3-mediated Ca2+ signaling; it acts as a phospho-regulated scaffold that binds PP1 and PP2A in a mutually exclusive, PKA-dependent manner to control dephosphorylation of GABAA receptor subunits, SNAP-25, HSL, and Smad proteins; its C2 domain directly binds syntaxin 1 and SNAP-25 to inhibit SNARE complex formation and exocytosis; it sequesters GABARAP to regulate KIF5B-driven vesicle transport and insulin secretion; it competes with PI3K for PI(4,5)P2 to suppress AKT signaling, cell cycle progression, and fibrosis (via PI3K-AKT-MST2-YAP); it stabilizes UCP1 protein by reducing ubiquitination to drive lipid browning in renal cancer; and in hematopoietic stem cells it modulates intracellular calcium dynamics to restrain megakaryocytic priming and preserve quiescence.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PLCL1 (also called PRIP-1) is a catalytically inactive phospholipase C-δ1-like scaffold protein that integrates inositol phosphate signaling, protein phosphatase targeting, and SNARE-dependent exocytosis to regulate calcium dynamics, receptor trafficking, and cell fate across diverse tissues. Its PH domain binds Ins(1,4,5)P3 and PI(4,5)P2 to attenuate IP3-mediated Ca²⁺ release and to compete with PI3K for PI(4,5)P2 substrate, thereby suppressing AKT signaling, cell cycle progression, and fibrosis via the PI3K–AKT–MST2–YAP axis [PMID:10581172, PMID:15468068, PMID:33743346, PMID:41680862]. PLCL1 functions as a PKA-regulated phospho-switch that binds PP1 and PP2A in a mutually exclusive manner to control dephosphorylation of GABAA receptor β-subunits, SNAP-25, and hormone-sensitive lipase, while its C2 domain directly engages syntaxin 1 and SNAP-25 to inhibit SNARE complex assembly and exocytosis [PMID:23911386, PMID:22311984, PMID:23341457, PMID:24945349]. Through GABARAP sequestration it restrains KIF5B-driven insulin vesicle transport, and through modulation of BMP–Smad signaling it negatively regulates osteoblast differentiation, while promoting osteoclastogenesis via calcineurin–NFATc1 [PMID:24812354, PMID:21757756, PMID:28341745].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing that PLCL1 is a catalytically dead PLC-δ homolog whose PH domain binds IP3 and PIP2 resolved the paradox of a PLC-like protein that cannot hydrolyze lipids and reframed it as a signaling scaffold.\",\n      \"evidence\": \"Biochemical binding assays, GFP-fusion imaging, and active-site mutagenesis in COS7 and myoblast cells\",\n      \"pmids\": [\"10581172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural basis for catalytic inactivity beyond sequence comparison\", \"Endogenous protein levels and tissue distribution incompletely mapped\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of PP1, PP2A, and GABARAP as direct binding partners of PLCL1 established it as a phosphatase-targeting scaffold with a role in GABAA receptor regulation, explaining altered GABAergic transmission in KO mice.\",\n      \"evidence\": \"Yeast two-hybrid, pull-down, surface plasmon resonance, PP1 activity assays, and PRIP-1 knockout mouse electrophysiology\",\n      \"pmids\": [\"11979730\", \"12467885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for simultaneous versus mutually exclusive PP1/GABARAP binding unknown\", \"In vivo stoichiometry of PLCL1–PP1 complex not determined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating that PLCL1 shields IP3 from 5-phosphatase degradation in neurons showed it sustains IP3 pools rather than simply sequestering them, providing a mechanism for the reduced Ca²⁺ responses in KO neurons.\",\n      \"evidence\": \"PRIP-1 KO mouse neurons with Ca²⁺ imaging, [³H]IP3 labeling, and 5-phosphatase activity assays\",\n      \"pmids\": [\"15468068\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the 5-phosphatase isoform protected by PLCL1 not fully resolved\", \"Whether PLCL1 also modulates IP3 receptor gating directly remains untested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealing that PKA phosphorylation of PLCL1 triggers a PP1-to-PP2A switch established a phospho-dependent scaffold mechanism that temporally controls GABAA receptor β3-subunit dephosphorylation and surface expression.\",\n      \"evidence\": \"Site-directed mutagenesis, reconstituted binding with purified proteins, and double-KO mouse cortical neurons with forskolin stimulation\",\n      \"pmids\": [\"16854455\", \"16404143\", \"17690529\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetics of the PP1/PP2A switch in intact synapses not measured\", \"Whether other kinases besides PKA trigger the switch is unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing that PLCL1 loss enhances BMP-induced Smad1/5/8 phosphorylation and increases bone mineral density extended its scaffold role beyond GABAergic signaling into TGF-β superfamily regulation of osteoblast differentiation.\",\n      \"evidence\": \"PRIP-KO mouse micro-CT bone phenotyping and primary calvaria osteoblast Smad phosphorylation assays\",\n      \"pmids\": [\"21757756\", \"25981537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction between PLCL1 and Smad6 or BMP receptors not shown\", \"Mechanism of PLCL1-facilitated Smad6 methylation relies on poorly characterized inhibitor\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that the C2 domain binds syntaxin 1 and SNAP-25 to inhibit SNARE complex formation, and that PLCL1 recruits PP1 to dephosphorylate SNAP-25, established a dual mechanism for suppressing regulated exocytosis.\",\n      \"evidence\": \"In vitro binding, co-IP, SNARE complex gel assay, and noradrenalin secretion from PC12 cells with PP1-binding mutant controls\",\n      \"pmids\": [\"22311984\", \"23341457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether both C2-domain SNARE binding and PP1-mediated SNAP-25 dephosphorylation operate in the same cell type simultaneously is unclear\", \"Physiological relevance for neurotransmitter release in vivo not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Biochemical reconstitution of mutually exclusive PP1 and PP2A binding to PLCL1 in living cells confirmed the phospho-switch model and generalized it beyond GABAA receptors.\",\n      \"evidence\": \"Pull-down with purified proteins, mutagenesis, and immunoprecipitation from neuronal cells treated with forskolin/isoproterenol\",\n      \"pmids\": [\"23911386\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of PLCL1–PP1 and PLCL1–PP2A interfaces not available\", \"Full inventory of substrates regulated by the switch is incomplete\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing that PLCL1 sequesters GABARAP from insulin vesicles to limit KIF5B-driven transport, and separately translocates PP2A to lipid droplets to reduce lipolysis, broadened its scaffold functions to metabolic regulation in pancreatic β-cells and adipocytes.\",\n      \"evidence\": \"siRNA knockdown in MIN6 cells with live imaging of insulin vesicles; PRIP-KO mouse adipose tissue fractionation and lipolysis assays\",\n      \"pmids\": [\"24812354\", \"24945349\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PLCL1–GABARAP interaction is regulated by phosphorylation like PP1 binding is unknown\", \"Relative contribution of PLCL1 to whole-body lipid homeostasis versus other regulators not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstration that PLCL1 promotes osteoclastogenesis through calcium–calcineurin–NFATc1 signaling, with rescue by exogenous Ca²⁺, showed its IP3/Ca²⁺ buffering function operates in opposite directions in osteoblasts versus osteoclasts.\",\n      \"evidence\": \"PRIP-KO mouse orthodontic tooth movement model, osteoclast differentiation, calcineurin activity, and Ca²⁺ imaging with rescue\",\n      \"pmids\": [\"28341745\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PLCL1 simultaneously promotes and inhibits Ca²⁺ signaling in different bone lineages is mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Finding that PLCL1 stabilizes UCP1 by reducing its ubiquitination in clear cell renal carcinoma introduced a non-canonical function in protein quality control and lipid browning distinct from its classical IP3/phosphatase roles.\",\n      \"evidence\": \"PLCL1 overexpression in ccRCC cells, ubiquitination assay, lipid droplet imaging, and tumor xenograft\",\n      \"pmids\": [\"31131187\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The E3 ligase counteracted by PLCL1 is not identified\", \"Whether PLCL1 directly binds UCP1 or acts indirectly through signaling is unresolved\", \"Single-lab finding awaits independent confirmation\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that PLCL1 competes with PI3K for PIP2 substrate to suppress AKT/GSK3β/cyclin D1 signaling and tumor growth unified its PH-domain lipid-binding function with tumor-suppressive activity.\",\n      \"evidence\": \"PLCL1 overexpression and knockdown in MCF-7 cells, PIP3 immunofluorescence, cell cycle analysis, and xenograft model\",\n      \"pmids\": [\"33743346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct measurement of PIP2 consumption or PI3K displacement at the membrane not performed\", \"Generality across cancer types beyond breast cancer not established at the time\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Linking PLCL1 loss to AKT-driven MST2 phosphorylation and YAP nuclear translocation in a fibrosis model connected its PIP2-sequestration function to the Hippo pathway and organ fibrosis in vivo.\",\n      \"evidence\": \"PRIP-KO mouse angiotensin II fibrosis model, MEF TGF-β1 treatment, AKT/MST2/YAP western blots, and YAP nuclear localization\",\n      \"pmids\": [\"41680862\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PLCL1 directly interacts with MST2 or YAP or acts entirely through AKT is unknown\", \"Therapeutic potential of restoring PLCL1 in fibrosis not assessed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for PLCL1's mutually exclusive PP1/PP2A binding, the mechanism by which PLCL1 reduces UCP1 ubiquitination, and whether its calcium-regulatory function in quiescent HSCs operates through IP3 sequestration, PIP2 competition, or both.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of PLCL1 or its complexes exists\", \"HSC calcium regulatory mechanism is from a single preprint and awaits peer review\", \"Complete substrate inventory for PLCL1-scaffolded PP1/PP2A is lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 1, 3, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 4, 5, 7, 9, 10, 11]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 5, 7, 8, 17, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7, 9]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 5, 12, 13, 17, 21]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 4, 5, 6]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [8, 9, 10]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [11, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [14, 15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PPP1CA\",\n      \"PPP2CA\",\n      \"GABARAP\",\n      \"SNAP25\",\n      \"STX1A\",\n      \"GABRB3\",\n      \"GABRG2\",\n      \"DEPP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}