{"gene":"SPRY4","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":2013,"finding":"SPRY4 protein acts as a negative modulator of the FGF8-FGFR1 signaling pathway; loss-of-function mutations in SPRY4 were identified in congenital hypogonadotropic hypogonadism (CHH) patients, placing SPRY4 in the FGF synexpression group that regulates GnRH neuron development. Most FGF17 and IL17RD mutations (the top-ranked candidates) altered protein function in vitro.","method":"Sequencing of 386 CHH individuals, functional in vitro assays for candidate mutations, bioinformatics interactome analysis (IBAS)","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — genetic pathway placement with in vitro functional validation, single study","pmids":["23643382"],"is_preprint":false},{"year":2006,"finding":"SPRY4 gene is a transcriptional target of the WNT/β-catenin signaling pathway; conserved double TCF/LEF-binding sites were identified in the 5′-promoter region of SPRY4 orthologs across mammals, establishing SPRY4 as an evolutionarily conserved negative feedback inhibitor of FGF/RTK signaling downstream of WNT activation in progenitor cells.","method":"Bioinformatics/comparative genomics identification of TCF/LEF binding sites; humint (literature integration)","journal":"International journal of molecular medicine","confidence":"Low","confidence_rationale":"Tier 4 — computational/bioinformatics prediction without direct experimental validation of binding","pmids":["16465403"],"is_preprint":false},{"year":2013,"finding":"Spry1 and Spry4 have opposing roles in human aortic vascular smooth muscle cell (VSMC) phenotype: Spry1 maintains the differentiated contractile state by sustaining Akt activation and myocardin expression via FoxO3a, while Spry4 suppresses VSMC differentiation marker expression by antagonizing both MAPK/ERK and Akt signaling. ChIP assays showed FoxO3a represses myocardin promoter activity, and Spry1/Spry4 modulate myocardin mRNA levels through this pathway.","method":"siRNA knockdown, ChIP assays, Western blotting for pathway components, phenotypic marker quantification in human VSMCs in vitro","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal KD experiments with ChIP and pathway readouts, single study","pmids":["23554919"],"is_preprint":false},{"year":2014,"finding":"SPRY4 inhibits FGF2-induced ERK1/2 signaling in endometrial adenocarcinoma (Ishikawa) cells; plasmid-driven SPRY4 expression blocked FGF2-induced ERK1/2 activity as measured by luciferase reporter and Western blot, and significantly reduced cell proliferation including 17β-estradiol-induced proliferation.","method":"Luciferase reporter assay, Western blot, colony formation and cell counting assays in Ishikawa cells","journal":"Gynecological endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — direct in vitro functional assay with mechanistic readout, single study single lab","pmids":["24811094"],"is_preprint":false},{"year":2015,"finding":"MT1-MMP negatively regulates SPRY4 transcription in melanoma cells through an MMP2/RAC1 axis; MT1-MMP knockdown increases SPRY4 mRNA and protein, and SPRY4 modulates MT1-MMP-dependent cell migration such that SPRY4 knockdown rescues impaired migration caused by MT1-MMP knockdown.","method":"Microarray gene expression, shRNA knockdown of MT1-MMP, qRT-PCR, Western blot, migration assays in melanoma cells","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods, genetic epistasis via rescue experiment, single lab","pmids":["26392417"],"is_preprint":false},{"year":2015,"finding":"KSRP (K-homology splicing regulatory protein), an AU-rich element-binding protein, promotes post-transcriptional destabilization of SPRY4 transcripts in non-small cell lung cancer cells; silencing KSRP decreased cell proliferation, reversed anchorage-independent growth, and reduced migration/invasion in a SPRY4-dependent manner.","method":"siRNA knockdown of KSRP, qRT-PCR measurement of SPRY4 transcript stability, functional assays (proliferation, migration, anchorage-independent growth)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic post-transcriptional regulation with functional consequence, single lab","pmids":["28275056"],"is_preprint":false},{"year":2015,"finding":"SPRY4 knockdown in human MDA-MB-231 breast cancer cells increased cell proliferation and migration, elevated β3-integrin expression and CD133+CD44+ stem cell subpopulation, enhanced mammosphere formation, reduced paclitaxel sensitivity, and increased tumor initiation potency in vivo, identifying endogenous SPRY4 as a suppressor of cancer stem cell properties.","method":"Lentiviral shRNA knockdown, flow cytometry, mammosphere assay, limiting dilution xenograft, Western blotting","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with multiple defined cellular and in vivo phenotypes, single lab","pmids":["26973433"],"is_preprint":false},{"year":2015,"finding":"SPRY4 acts as a negative regulator of PKCα-mediated activation of MAPK, especially p38MAPK phosphorylation; miR-411-5p directly targets SPRY4, and SPRY4 siRNA or miR-411-5p overexpression both activate p38MAPK phosphorylation, promoting apoptosis and myogenic differentiation in rhabdomyosarcoma (RMS) cells. This establishes a TGF-β1/miR-411-5p/SPRY4/p38MAPK autoregulatory loop governing proliferation vs. differentiation.","method":"Luciferase reporter system, siRNA knockdown of SPRY4, miRNA overexpression, Western blot for p38MAPK phosphorylation, miRNA microarray, in vivo tumorigenicity assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1-2 — direct target validation by luciferase, multiple orthogonal methods, mechanistic pathway placement with in vivo confirmation","pmids":["26291313"],"is_preprint":false},{"year":2017,"finding":"IRF6 and SPRY4 signaling interact genetically in periderm development; crossing Irf6+/- mice with TgKRT14::Spry4 transgenic mice (which express Spry4 in the basal epithelial layer to reduce FGF/RTK signaling) produced a non-additive increase in oral epithelial adhesion severity, and the double mutant embryos showed abnormal GRHL3 expression at adhesion sites, placing SPRY4/RTK signaling and IRF6 in the same periderm differentiation pathway.","method":"Genetic epistasis (double mutant cross), quantitative oral adhesion assay, immunofluorescence for GRHL3 and K6 in mouse embryos","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis via double mutant with quantitative phenotype, single study","pmids":["28732181"],"is_preprint":false},{"year":2018,"finding":"SPRY4 binds directly to wild-type KIT and primary KIT mutants in gastrointestinal stromal tumors (GISTs), inhibiting KIT expression and activation and thereby decreasing cell survival and proliferation. SPRY4 also enhances the inhibitory effect of imatinib on primary KIT mutants but does not affect secondary drug-resistant KIT mutants, suggesting primary and secondary KIT mutants signal through different downstream cascades. Inhibition of SPRY4 in KITV558A/WT mice increased GIST tumorigenesis in vivo.","method":"Co-immunoprecipitation (protein binding), Western blot (KIT expression/activation), Ba/F3 and GIST-T1 cell assays, germline KITV558A/WT mouse model, imatinib sensitivity assays","journal":"Gastric cancer","confidence":"High","confidence_rationale":"Tier 1-2 — direct protein-protein interaction demonstrated by Co-IP, mechanistic consequence shown in vitro and in vivo, multiple orthogonal methods","pmids":["37222910"],"is_preprint":false},{"year":2019,"finding":"SPRY4 overexpression inhibited trophoblast (HTR8/SVneo) proliferation and promoted apoptosis in vitro; mechanistically, IFN-γ-induced STAT1 expression and activation (via PI3K/AKT pathway) were identified as downstream effectors of SPRY4 in regulating trophoblast proliferation and apoptosis, and IFN-γ upregulated SPRY4 expression. Both STAT1 and phospho-STAT1 were elevated in RM patient trophoblasts and positively correlated with SPRY4.","method":"siRNA knockdown and lentiviral overexpression of SPRY4, gene expression microarray, Western blot for STAT1/pSTAT1/pAKT, proliferation and apoptosis assays in HTR8/SVneo cells","journal":"American journal of reproductive immunology","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway identification with gain/loss of function and microarray, single lab","pmids":["32196809"],"is_preprint":false},{"year":2019,"finding":"SPRY4 knockdown in AIS (adolescent idiopathic scoliosis) bone marrow-derived MSCs impaired osteogenic differentiation, while SPRY4 overexpression in AIS MSCs enhanced it. SPRY4 contributes to osteogenic differentiation and melatonin response via MEK-ERK1/2-dependent signaling; melatonin upregulated SPRY4 and promoted osteogenesis, while SPRY4 ablation abolished these melatonin effects.","method":"siRNA knockdown, lentiviral overexpression, Western blot, qRT-PCR, osteogenic differentiation assays, melatonin treatment","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — gain/loss of function with defined pathway placement (MEK-ERK1/2), single lab","pmids":["31645544"],"is_preprint":false},{"year":2019,"finding":"SPRY4 knockdown in human adipose-derived stem cells (hASCs) significantly enhanced osteogenic differentiation (ALP 2.3-fold, OPN 3.5-fold increase; increased calcium deposition) via induction of ERK1/2 phosphorylation, and promoted bone formation in ectopic and calvarial defect mouse models in vivo.","method":"siRNA knockdown (transient), Western blot, qRT-PCR, Alizarin red staining, microCT, histological analysis of ectopic and calvarial defect models","journal":"Tissue engineering. Part A","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods in vitro and in vivo, single lab","pmids":["30982407"],"is_preprint":false},{"year":2021,"finding":"SPRY4 suppresses ERK signaling downstream of RAS; SPRY4 overexpression suppressed proliferation and invasion of colorectal cancer cells, and the increased proliferation/invasion from SPRY4 silencing was reversed by EZH2 inhibition, placing SPRY4 upstream of EZH2 in CRC. SPRY4 overexpression also inhibited tumorigenesis in nude mice.","method":"SPRY4 overexpression/silencing plasmids, CCK-8, colony formation, EdU, wound healing, Transwell assays, flow cytometry, EZH2 inhibitor rescue, xenograft","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis via inhibitor rescue with multiple functional assays and in vivo confirmation, single lab","pmids":["33879635"],"is_preprint":false},{"year":2021,"finding":"MEF2D in complex with HDAC4 directly binds to the SPRY4 promoter and suppresses SPRY4 transcription, which relieves SPRY4-mediated inhibition of the MAPK/ERK signaling pathway and contributes to sorafenib resistance in hepatocellular carcinoma. HDAC4 inhibition restored SPRY4 expression and ERK inhibition, sensitizing tumor cells to sorafenib in vivo.","method":"ChIP assays (MEF2D/HDAC4 binding to SPRY4 promoter), Western blot, HDAC4 inhibitor treatment, mouse liver tumor model with sorafenib","journal":"Cancer letters","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP directly demonstrates transcription factor binding to SPRY4 promoter, mechanistic consequence validated in vivo, multiple methods","pmids":["34339801"],"is_preprint":false},{"year":2021,"finding":"SPRY4 overexpression in chondrocytes prevents hypertrophy, reduces senescence, ROS production, and ECM protease expression via regulation of the MAPK signaling pathway; SPRY4 knockdown in healthy chondrocytes caused all these pathological features. SPRY4 is downregulated in degenerated human cartilage and OA-model rat tissue.","method":"siRNA knockdown and lentiviral overexpression of SPRY4, histological analysis, Western blot, fluorescent ROS assay, DMM rat model","journal":"NPJ Regenerative medicine","confidence":"Medium","confidence_rationale":"Tier 2 — gain/loss of function with multiple cellular and in vivo readouts, single lab","pmids":["34535669"],"is_preprint":false},{"year":2021,"finding":"LINC00675 competes with LSD1 binding and enhances the interaction of LSD1 with H3K4me2, reducing H3K4me2 enrichment at the SPRY4 promoter and suppressing SPRY4 transcription, thereby acting as a suppressor of gastric cancer cell proliferation and migration. RIP assay confirmed LINC00675-LSD1 interaction; ChIP assay verified reduced H3K4me2 at SPRY4 promoter.","method":"RIP, coIP, ChIP, RNA-sequencing, in vitro and in vivo functional assays","journal":"Molecular therapy. Nucleic acids","confidence":"Medium","confidence_rationale":"Tier 2 — multiple chromatin-based assays establishing epigenetic regulation of SPRY4 promoter, single lab","pmids":["33230474"],"is_preprint":false},{"year":2022,"finding":"SPRY4 promotes adipogenic differentiation of human adipose-derived MSCs (hAMSCs) via activation of the MEK-ERK1/2 pathway; gain- and loss-of-function experiments demonstrated SPRY4 positively correlates with and causally promotes adipogenesis both in vitro and in vivo.","method":"Gain/loss-of-function (siRNA and overexpression), Western blot, qPCR, adipogenic differentiation assays in vitro, in vivo fat pad model","journal":"Adipocyte","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional functional assays with pathway identification, single lab","pmids":["36082406"],"is_preprint":false},{"year":2023,"finding":"SPRY4 acts as an ERK-dependent negative feedback regulator of growth factor (GDNF and FGF2) signaling in mouse spermatogonial stem cells (SSCs); Spry4 mRNA is robustly induced by GDNF/FGF2, and Spry4 ablation dysregulates ERK MAPK downstream of RAS. Loss of Spry4 shifts SSC fate toward early differentiation with loss of stem cell activity, and a Spry4 reporter line showed strong Spry4 promoter activity demarcates the adult SSC population in vivo.","method":"Single-cell quantitative ERK MAPK signaling analysis, Spry4 KO cultures, Spry4 reporter mouse line, in vivo spermatogonial stem cell assays, qRT-PCR","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including single-cell signaling, KO, and in vivo reporter, mechanistic pathway placement replicated","pmids":["37552049"],"is_preprint":false},{"year":2024,"finding":"A SPRY4 variant (c.157C>T, p.Arg53Trp) reduces SPRY4 protein levels in HEK293T cells and disrupts the redox system and mitochondrial function in mouse oocytes; Spry4-/- mice exhibit ovarian oxidative stress and decreased ovarian function. These phenotypes could be partially reversed by exogenous Nrf1 cRNA, identifying a role for SPRY4 in maintaining oocyte redox homeostasis and early embryonic developmental potential.","method":"Whole-exome sequencing, Sanger sequencing, Western blot (protein level in HEK293T), cRNA injection in mouse oocytes, RNA sequencing, fluorescence/absorbance assays, ELISA, Spry4 KO mouse histology","journal":"Human reproduction","confidence":"High","confidence_rationale":"Tier 1-2 — functional variant characterization with multiple orthogonal methods, in vitro and KO mouse in vivo validation","pmids":["39348320"],"is_preprint":false},{"year":2024,"finding":"A SPRY4 variant (c.701C>T, p.Thr234Met) identified in familial nonmedullary thyroid cancer increases cell viability and colony formation; phosphokinase array and Western blot showed these effects are mediated through MAPK/ERK pathway activation, and cells with this variant showed higher responsiveness to a MEK inhibitor.","method":"Whole-exome sequencing, Sanger sequencing, in vitro cell viability/colony formation assays, phosphokinase array, Western blot, MEK inhibitor treatment","journal":"Thyroid","confidence":"Medium","confidence_rationale":"Tier 2 — functional variant with pathway identification using phosphokinase array and inhibitor, single lab","pmids":["33906393"],"is_preprint":false},{"year":2024,"finding":"SPRY4 knockdown in PCOS mice normalized the estrous cycle, reduced serum androgens and LH/FSH ratio, alleviated ovarian oxidative stress, and restored steroidogenic enzyme expression by reducing ERK1/2 phosphorylation. ERK2 agonist (tBHQ) reversed the effects of SPRY4 knockdown, establishing that SPRY4 modulates oxidative stress and steroidogenesis via ERK1/2 phosphorylation in granulosa cells.","method":"Lentiviral SPRY4 knockdown in DHEA-induced PCOS mice, ERK2 agonist rescue, ELISA, Western blot, ROS/MDA/SOD assays, granulosa cell isolation","journal":"Steroids","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional manipulation with signaling rescue in vivo and in vitro, single lab","pmids":["39313103"],"is_preprint":false},{"year":2024,"finding":"Exosomal SPRY4 from adipogenic BMSCs impairs angiogenesis by directly interacting with PTPRB (receptor-type tyrosine phosphatase B), enhancing its phosphatase activity, thereby inhibiting TIE2 receptor autophosphorylation and downstream PI3K/AKT signaling. In vivo, SPRY4 overexpression exacerbated impaired bone mass and microvascular density in SONFH rat model; pharmacological modulation of PTPRB and PI3K reversed these effects.","method":"Co-immunoprecipitation, mass spectrometry, exosome co-culture, tube formation assay, Western blot, RNA-seq, in vivo SONFH rat model, HE staining, IHC","journal":"Stem cell research & therapy","confidence":"High","confidence_rationale":"Tier 1-2 — direct protein-protein interaction by Co-IP/MS, mechanistic consequence in vitro and in vivo, multiple orthogonal methods","pmids":["40660390"],"is_preprint":false},{"year":2025,"finding":"Germline-specific Spry4 deletion (Spry4 G-KO) in adult mice causes hyper-activation of MAPK/ERK in undifferentiated spermatogonia, reducing genome integrity after busulfan injury, unleashing excessive early spermatogenesis, and ultimately impairing SSC regeneration and fertility restoration. MEK1/2 inhibitor (PD0325901), but not rapamycin, rescued spermatogonial proliferation in Spry4 G-KO testes post-injury, confirming that SPRY4 controls an ERK-specific checkpoint for SSC recovery.","method":"Germline-specific Spry4 KO (conditional), busulfan injury model, MEK inhibitor (PD0325901) rescue, rapamycin comparison, Western blot, qRT-PCR for Id1/Cxcl12, fertility assays","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 1-2 — conditional KO with pharmacological rescue and pathway specificity demonstrated, multiple readouts in vivo","pmids":["41852347"],"is_preprint":false},{"year":2014,"finding":"Spry4 knockout mice (spry4-/-) showed reduced inflammatory responses after spinal cord injury (SCI), including decreased TNFα secretion and reduced macrophage/neutrophil invasion into the lesion site, as well as attenuated astrocytic gliosis and increased neuronal survival, establishing that SPRY4-mediated suppression of FGF signaling limits pro-regenerative responses after SCI.","method":"Spry4-/- mouse model, histological analysis, cytokine measurements (TNFα), immunostaining for macrophage/neutrophil markers and GFAP, neuronal survival counting post-SCI","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotypes in vivo, single lab","pmids":["25541251"],"is_preprint":false},{"year":2019,"finding":"Overexpression of the FGF negative feedback regulator Sprouty4 in the dental epithelium (K14-Spry4 transgenic mice) caused defects in cusp morphology, enamel irregularities, and delayed signaling center formation in the mouse molar, demonstrating that FGF signaling through SPRY4 feedback regulation controls tooth shape and enamel mineralization.","method":"Transgenic mouse overexpression (K14-Spry4), histological analysis, microCT, developmental staging of tooth morphogenesis","journal":"JBMR plus","confidence":"Medium","confidence_rationale":"Tier 2 — transgenic gain-of-function with defined developmental phenotypes, single lab","pmids":["31485553"],"is_preprint":false},{"year":2018,"finding":"SPRY4 mRNA directly confirmed as a target of miR-411-5p and miR-411-3p; miR-411 overexpression decreased SPRY4 expression and induced EGFR/AKT signaling activation and EMT in NSCLC, while SPRY4 knockdown phenocopied miR-411 overexpression, and SPRY4 restoration reversed the oncogenic effects.","method":"Luciferase reporter assay (direct target confirmation), Western blot, NSCLC cell proliferation/migration/apoptosis assays, in vivo tumor growth model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 — direct luciferase validation of miR-SPRY4 interaction, phenotypic rescue by SPRY4 restoration, in vivo confirmation","pmids":["30390072"],"is_preprint":false},{"year":2018,"finding":"SPRY4 knockdown in TGCT cell lines (833K and NT2-D1) resulted in decreased cell growth, migration, and invasion, and a significant reduction in Akt phosphorylation, indicating SPRY4 acts as an oncogene in TGCTs through activation of the PI3K/Akt signaling pathway.","method":"siRNA-mediated knockdown, Western blot for pAkt, cell growth, migration, and invasion assays in two TGCT cell lines","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — functional KD in two cell lines with defined signaling readout, single lab","pmids":["29410498"],"is_preprint":false},{"year":2023,"finding":"miR-1293 knockdown attenuates lung adenocarcinoma-induced angiogenesis by de-repressing Spry4, which inhibits ERK1/2 phosphorylation and nuclear translocation, reducing VEGF-A and bFGF secretion. siRNA-mediated Spry4 perturbation abolished the ERK1/2 inhibition caused by miR-1293 knockdown, confirming the miR-1293/Spry4/ERK1/2 axis.","method":"miRNA knockdown, siRNA rescue, Western blot for pERK1/2 and nuclear/cytoplasm distribution, HUVEC tube formation, in vivo angiogenesis markers","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis confirmed by siRNA rescue with multiple angiogenesis readouts, single lab","pmids":["38972427"],"is_preprint":false},{"year":2025,"finding":"SPRY2 and SPRY4 form homo- or hetero-oligomers; SPRY2 acts as a novel effector of K-Ras at the plasma membrane, and SPRY4 participates in these oligomeric complexes. Co-immunoprecipitation and BRET assays showed SPRY2-KRas interaction; relevance to SPRY4 is through its hetero-oligomerization with SPRY2.","method":"TurboID proximity proteomics, BRET assays, Co-immunoprecipitation, membrane anchorage inhibitors, interface mutagenesis","journal":"bioRxiv (preprint)","confidence":"Low","confidence_rationale":"Tier 3 — SPRY4 hetero-oligomerization is a secondary finding in a SPRY2-focused study; single preprint","pmids":["bio_10.1101_2025.06.13.659437"],"is_preprint":true}],"current_model":"SPRY4 is a negative feedback inhibitor of receptor tyrosine kinase (RTK)/MAPK-ERK signaling that is induced by FGF, GDNF, and other growth factors; it acts by suppressing RAS-dependent ERK phosphorylation and also interacts directly with KIT and PTPRB to modulate their activation, thereby regulating cell proliferation, differentiation, migration, and stem cell self-renewal across multiple cell types, while its transcription is controlled by WNT/TCF-LEF, MEF2D/HDAC4, and LSD1-mediated epigenetic mechanisms."},"narrative":{"teleology":[{"year":2006,"claim":"The question of how SPRY4 transcription is linked to developmental signaling was addressed by identifying conserved TCF/LEF binding sites in the SPRY4 promoter, placing it as a potential WNT-responsive gene.","evidence":"Comparative genomics across mammalian SPRY4 orthologs identified double TCF/LEF-binding elements","pmids":["16465403"],"confidence":"Low","gaps":["Computational prediction without experimental validation of TCF/LEF binding or transcriptional activation","No ChIP or reporter assay confirmation","No functional consequence of WNT-mediated SPRY4 induction tested"]},{"year":2013,"claim":"Two key advances established SPRY4's physiological significance: its genetic association with congenital hypogonadotropic hypogonadism placed it in the FGF8-FGFR1 signaling axis controlling GnRH neuron development, while its opposing role to SPRY1 in vascular smooth muscle cells revealed that SPRY4 suppresses both ERK and Akt to inhibit differentiation.","evidence":"Sequencing of 386 CHH patients with in vitro functional assays for mutations; siRNA knockdown with ChIP and Western blot in human VSMCs","pmids":["23643382","23554919"],"confidence":"Medium","gaps":["CHH mutations not shown to be fully causative (oligogenic model)","VSMC findings from a single lab without independent replication","Molecular mechanism of SPRY4 dual ERK/Akt inhibition in VSMCs not resolved"]},{"year":2014,"claim":"Direct functional evidence confirmed that SPRY4 inhibits FGF2-stimulated ERK1/2 signaling and cell proliferation, while Spry4 knockout mice revealed an unexpected role in modulating inflammatory responses after spinal cord injury.","evidence":"Luciferase reporter and Western blot in endometrial cancer cells; Spry4−/− mice with SCI histology and cytokine measurements","pmids":["24811094","25541251"],"confidence":"Medium","gaps":["Endometrial cancer study used overexpression only without KD validation","SCI phenotype mechanism (which RTK pathway) not dissected","No direct biochemical mechanism of ERK inhibition identified"]},{"year":2015,"claim":"Multiple studies revealed that SPRY4 expression is tightly regulated post-transcriptionally and by microRNAs, and that endogenous SPRY4 suppresses cancer stem cell properties: KSRP destabilizes SPRY4 mRNA in NSCLC, miR-411-5p directly targets SPRY4 to relieve p38MAPK inhibition in rhabdomyosarcoma, and SPRY4 knockdown expands the CD133+CD44+ stem cell population in breast cancer.","evidence":"siRNA knockdown of KSRP with mRNA stability assays; luciferase reporter validation of miR-411-5p targeting SPRY4 3′UTR; lentiviral shRNA with flow cytometry and limiting dilution xenograft","pmids":["28275056","26291313","26973433"],"confidence":"Medium","gaps":["Post-transcriptional regulation by KSRP not confirmed across cell types","p38MAPK regulation by SPRY4 contrasts with canonical ERK-centered models — specificity unclear","Cancer stem cell findings from a single triple-negative breast cancer line"]},{"year":2017,"claim":"Genetic epistasis between Spry4 and Irf6 in mouse embryos demonstrated that SPRY4-mediated RTK/FGF feedback regulation cooperates with IRF6 in periderm differentiation, with compound mutants showing synergistic oral epithelial adhesion defects.","evidence":"Double mutant cross (Irf6+/− × TgKRT14::Spry4) with quantitative adhesion scoring and GRHL3 immunofluorescence","pmids":["28732181"],"confidence":"Medium","gaps":["Only Spry4 gain-of-function tested; Spry4 loss-of-function epistasis with Irf6 not examined","Downstream target of SPRY4 in periderm not identified beyond GRHL3 mislocalization","Single developmental context"]},{"year":2018,"claim":"Direct protein-protein interaction between SPRY4 and KIT was demonstrated, showing that SPRY4 inhibits KIT expression and activation in GISTs and enhances imatinib sensitivity for primary but not secondary KIT mutants, while miR-411 was confirmed to target SPRY4 mRNA to activate EGFR/AKT signaling in NSCLC.","evidence":"Co-immunoprecipitation of SPRY4-KIT, Ba/F3 and GIST-T1 cell assays, KITV558A/WT mouse model; luciferase reporter for miR-411/SPRY4 with phenotypic rescue in NSCLC cells and xenografts","pmids":["37222910","30390072"],"confidence":"High","gaps":["SPRY4-KIT binding domain not mapped","Whether SPRY4 binds other RTKs besides KIT via the same mechanism is unknown","miR-411 studies do not address SPRY4-independent miR-411 targets"]},{"year":2019,"claim":"SPRY4's role in stem cell differentiation was extended to osteogenesis and tooth development: SPRY4 knockdown in adipose-derived stem cells enhanced osteogenic differentiation via ERK1/2, while transgenic Spry4 overexpression in dental epithelium disrupted cusp morphology and enamel mineralization, and SPRY4 promoted osteogenesis in AIS mesenchymal stem cells downstream of melatonin signaling.","evidence":"siRNA KD with in vivo bone formation models; K14-Spry4 transgenic mice with microCT; gain/loss-of-function in AIS MSCs","pmids":["30982407","31485553","31645544"],"confidence":"Medium","gaps":["Opposing effects of SPRY4 on osteogenesis in different MSC sources (enhances in AIS MSCs, inhibits in hASCs) not reconciled","Melatonin-SPRY4 axis mechanism not fully delineated","Tooth phenotype not linked to specific downstream targets"]},{"year":2021,"claim":"Transcriptional and epigenetic control of SPRY4 was mechanistically resolved: MEF2D/HDAC4 directly binds and represses the SPRY4 promoter to drive sorafenib resistance in hepatocellular carcinoma, while LINC00675 redirects LSD1 to demethylate H3K4me2 at the SPRY4 promoter in gastric cancer, and SPRY4 was placed upstream of EZH2 in colorectal cancer signaling.","evidence":"ChIP for MEF2D/HDAC4 at SPRY4 promoter with HDAC4 inhibitor rescue in vivo; RIP/ChIP for LINC00675-LSD1-H3K4me2 axis; EZH2 inhibitor rescue of SPRY4-silenced CRC cells with xenograft","pmids":["34339801","33230474","33879635"],"confidence":"High","gaps":["Whether MEF2D/HDAC4 and LSD1-mediated mechanisms operate in the same tissues is untested","EZH2 as downstream effector of SPRY4 lacks direct biochemical evidence of connection","Chromatin regulation of SPRY4 in non-cancer contexts unexplored"]},{"year":2023,"claim":"Single-cell signaling analysis in spermatogonial stem cells established that SPRY4 is an ERK-specific negative feedback regulator induced by GDNF/FGF2 that maintains stem cell identity by preventing premature differentiation, while a miR-1293/SPRY4/ERK1/2 axis was shown to control tumor-associated angiogenesis.","evidence":"Single-cell ERK analysis in Spry4 KO SSC cultures, Spry4 reporter mouse; miR-1293 KD with SPRY4 siRNA rescue and HUVEC tube formation","pmids":["37552049","38972427"],"confidence":"High","gaps":["Whether SPRY4 controls SSC self-renewal versus differentiation balance cell-autonomously versus via niche signals not resolved","miR-1293/SPRY4 axis tested only in lung adenocarcinoma context"]},{"year":2024,"claim":"SPRY4's direct interaction partners were expanded and reproductive functions solidified: exosomal SPRY4 binds PTPRB to enhance its phosphatase activity against TIE2 and suppress angiogenic PI3K/AKT signaling, a SPRY4 coding variant disrupts oocyte redox homeostasis and mitochondrial function with partial rescue by Nrf1, and a familial thyroid cancer variant activates MAPK/ERK signaling.","evidence":"Co-IP/mass spectrometry for SPRY4-PTPRB with in vivo SONFH rat model; Spry4−/− mice with oocyte ROS/mitochondrial assays and Nrf1 cRNA rescue; phosphokinase array for SPRY4 Thr234Met variant in thyroid cancer cells","pmids":["40660390","39348320","33906393"],"confidence":"High","gaps":["SPRY4-PTPRB binding interface not mapped","Whether Nrf1-mediated rescue of oocyte defects reflects a direct SPRY4-Nrf1 regulatory axis or parallel pathway is unclear","Thyroid cancer variant functional effect tested in a single cell line"]},{"year":2025,"claim":"Germline-specific Spry4 conditional knockout confirmed that SPRY4 provides an ERK-specific checkpoint essential for spermatogonial stem cell recovery after injury, with MEK1/2 inhibitor rescue demonstrating pathway specificity over mTOR.","evidence":"Conditional Spry4 G-KO with busulfan injury, PD0325901 rescue versus rapamycin control, fertility assays","pmids":["41852347"],"confidence":"High","gaps":["Downstream ERK substrates mediating SSC recovery not identified","Whether SPRY4's checkpoint function operates in female germline stem cells is untested","Long-term fertility restoration after MEK inhibitor withdrawal not assessed"]},{"year":null,"claim":"The structural basis of SPRY4's interactions with KIT, PTPRB, and other RTKs, the molecular mechanism by which SPRY4 inhibits RAS-ERK signaling (direct RAS binding versus adaptor sequestration versus other), and how SPRY4 oligomerization with other Sprouty family members modulates its activity remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal structure or cryo-EM structure of SPRY4 or its complexes","Whether SPRY4 directly binds RAS (as suggested for SPRY2) has not been demonstrated","Tissue-specific and context-dependent switching between tumor suppressor and oncogenic functions lacks a unifying mechanistic model"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,7,9,13,18,22,23]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,9,22]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[22]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[8,18,23,25]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,13,14,20,26]}],"complexes":[],"partners":["KIT","PTPRB","SPRY2","MEF2D","HDAC4","KSRP"],"other_free_text":[]},"mechanistic_narrative":"SPRY4 is a negative feedback regulator of receptor tyrosine kinase (RTK) signaling that suppresses RAS-dependent ERK/MAPK and, in certain contexts, PI3K/AKT pathway activation to control cell proliferation, differentiation, migration, and stem cell self-renewal. Induced transcriptionally by FGF, GDNF, and other growth factors, SPRY4 inhibits ERK1/2 phosphorylation downstream of FGFR, EGFR, and KIT, and also directly binds KIT to inhibit its activation and PTPRB to enhance its phosphatase activity against TIE2, thereby suppressing angiogenic PI3K/AKT signaling [PMID:37222910, PMID:40660390, PMID:37552049, PMID:24811094]. SPRY4 transcription is itself regulated by the MEF2D/HDAC4 repressor complex and by LSD1-mediated H3K4me2 demethylation at its promoter, while its mRNA is destabilized by KSRP and targeted by miR-411-5p and miR-1293, enabling multilayered control of its expression in cancer and development [PMID:34339801, PMID:33230474, PMID:28275056, PMID:26291313]. Loss-of-function mutations in SPRY4 have been identified in congenital hypogonadotropic hypogonadism patients, and Spry4-null mice show defects in spermatogonial stem cell maintenance, oocyte redox homeostasis, and ovarian function, establishing SPRY4 as essential for reproductive biology [PMID:23643382, PMID:41852347, PMID:39348320]."},"prefetch_data":{"uniprot":{"accession":"Q9C004","full_name":"Protein sprouty homolog 4","aliases":[],"length_aa":299,"mass_kda":32.5,"function":"Suppresses the insulin receptor and EGFR-transduced MAPK signaling pathway, but does not inhibit MAPK activation by a constitutively active mutant Ras (PubMed:12027893). Probably impairs the formation of GTP-Ras (PubMed:12027893). Inhibits Ras-independent, but not Ras-dependent, activation of RAF1 (PubMed:12717443). Represses integrin-mediated cell spreading via inhibition of TESK1-mediated phosphorylation of cofilin (PubMed:15584898)","subcellular_location":"Cytoplasm; Cell projection, ruffle membrane","url":"https://www.uniprot.org/uniprotkb/Q9C004/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SPRY4","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SPRY4","total_profiled":1310},"omim":[{"mim_id":"617617","title":"SPRY4 INTRONIC TRANSCRIPT 1, NONCODING; SPRY4IT1","url":"https://www.omim.org/entry/617617"},{"mim_id":"615271","title":"HYPOGONADOTROPIC HYPOGONADISM 21 WITH OR WITHOUT ANOSMIA; HH21","url":"https://www.omim.org/entry/615271"},{"mim_id":"615270","title":"HYPOGONADOTROPIC HYPOGONADISM 20 WITH OR WITHOUT ANOSMIA; HH20","url":"https://www.omim.org/entry/615270"},{"mim_id":"615269","title":"HYPOGONADOTROPIC HYPOGONADISM 19 WITH OR WITHOUT ANOSMIA; HH19","url":"https://www.omim.org/entry/615269"},{"mim_id":"615267","title":"HYPOGONADOTROPIC HYPOGONADISM 18 WITH OR WITHOUT ANOSMIA; HH18","url":"https://www.omim.org/entry/615267"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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N-terminal polypeptide derived from vMIP-II exerts its anti-tumor activity in human breast cancer by regulating lncRNA SPRY4-IT1.","date":"2018","source":"Bioscience reports","url":"https://pubmed.ncbi.nlm.nih.gov/30104400","citation_count":11,"is_preprint":false},{"pmid":"31781046","id":"PMC_31781046","title":"A Rare SPRY4 Gene Mutation Is Associated With Anosmia and Adult-Onset Isolated Hypogonadotropic Hypogonadism.","date":"2019","source":"Frontiers in endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/31781046","citation_count":11,"is_preprint":false},{"pmid":"37042573","id":"PMC_37042573","title":"PDK1-stabilized LncRNA SPRY4-IT1 promotes breast cancer progression via activating NF-κB signaling pathway.","date":"2023","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/37042573","citation_count":8,"is_preprint":false},{"pmid":"29926610","id":"PMC_29926610","title":"[Effect of long noncoding RNA SPRY4-IT1 on proliferation and metastasis of medulloblastoma].","date":"2017","source":"Zhongguo ying yong sheng li xue za zhi = Zhongguo yingyong shenglixue zazhi = Chinese journal of applied physiology","url":"https://pubmed.ncbi.nlm.nih.gov/29926610","citation_count":8,"is_preprint":false},{"pmid":"24811094","id":"PMC_24811094","title":"SPRY4-mediated ERK1/2 signaling inhibition abolishes 17β-estradiol-induced cell growth in endometrial adenocarcinoma cell.","date":"2014","source":"Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/24811094","citation_count":8,"is_preprint":false},{"pmid":"32389901","id":"PMC_32389901","title":"Prevalence and associated phenotypes of DUSP6, IL17RD and SPRY4 variants in a large Chinese cohort with isolated hypogonadotropic hypogonadism.","date":"2020","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32389901","citation_count":7,"is_preprint":false},{"pmid":"31638266","id":"PMC_31638266","title":"Clinical significance of SPRY4-IT1 in efficacy and survival prediction in breast cancer patients undergoing neoadjuvant chemotherapy.","date":"2019","source":"Histology and histopathology","url":"https://pubmed.ncbi.nlm.nih.gov/31638266","citation_count":7,"is_preprint":false},{"pmid":"33827085","id":"PMC_33827085","title":"Long Noncoding RNA SPRY4-IT1 Modulates Ketamine-Induced Neurotoxicity in Human Embryonic Stem Cell-Derived Neurons through EZH2.","date":"2021","source":"Developmental neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/33827085","citation_count":6,"is_preprint":false},{"pmid":"37552049","id":"PMC_37552049","title":"SPRY4-dependent ERK negative feedback demarcates functional adult stem cells in the male mouse germline†.","date":"2023","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/37552049","citation_count":6,"is_preprint":false},{"pmid":"40561829","id":"PMC_40561829","title":"Dissecting the role of SPRY4-IT1 and TUG1 in modulating miR-425/TGF-β/ Smad signaling in mediating renal fibrosis and inflammation in lupus nephritis: Novel biomarkers and therapeutic targets.","date":"2025","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40561829","citation_count":6,"is_preprint":false},{"pmid":"37222910","id":"PMC_37222910","title":"SPRY4 inhibits and sensitizes the primary KIT mutants in gastrointestinal stromal tumors (GISTs) to imatinib.","date":"2023","source":"Gastric cancer : official journal of the International Gastric Cancer Association and the Japanese Gastric Cancer Association","url":"https://pubmed.ncbi.nlm.nih.gov/37222910","citation_count":6,"is_preprint":false},{"pmid":"36082406","id":"PMC_36082406","title":"SPRY4 promotes adipogenic differentiation of human mesenchymal stem cells through the MEK-ERK1/2 signaling pathway.","date":"2022","source":"Adipocyte","url":"https://pubmed.ncbi.nlm.nih.gov/36082406","citation_count":5,"is_preprint":false},{"pmid":"36909367","id":"PMC_36909367","title":"LncRNA SPRY4‑IT1 is upregulated and promotes the proliferation of prostate cancer cells under hypoxia in vitro.","date":"2023","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/36909367","citation_count":5,"is_preprint":false},{"pmid":"31485553","id":"PMC_31485553","title":"Downregulation of FGF Signaling by Spry4 Overexpression Leads to Shape Impairment, Enamel Irregularities, and Delayed Signaling Center Formation in the Mouse Molar.","date":"2019","source":"JBMR plus","url":"https://pubmed.ncbi.nlm.nih.gov/31485553","citation_count":5,"is_preprint":false},{"pmid":"33757566","id":"PMC_33757566","title":"Long non-coding RNA SPRY4-IT1 as a promising indicator for three field lymph-node dissection of thoracic esophageal carcinoma.","date":"2021","source":"Journal of cardiothoracic surgery","url":"https://pubmed.ncbi.nlm.nih.gov/33757566","citation_count":4,"is_preprint":false},{"pmid":"38972427","id":"PMC_38972427","title":"Knockdown of miR-1293 attenuates lung adenocarcinoma angiogenesis via Spry4 upregulation-mediated ERK1/2 signaling inhibition.","date":"2024","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38972427","citation_count":3,"is_preprint":false},{"pmid":"26302345","id":"PMC_26302345","title":"[Effect of Long Non-coding RNA SPRY4-IT1 on Invasion and Migration of A549 Cells].","date":"2015","source":"Zhongguo fei ai za zhi = Chinese journal of lung cancer","url":"https://pubmed.ncbi.nlm.nih.gov/26302345","citation_count":3,"is_preprint":false},{"pmid":"35378932","id":"PMC_35378932","title":"Long non-coding RNA SPRY4-IT1 promotes proliferation and metastasis in nasopharyngeal carcinoma cell.","date":"2022","source":"PeerJ","url":"https://pubmed.ncbi.nlm.nih.gov/35378932","citation_count":3,"is_preprint":false},{"pmid":"37797900","id":"PMC_37797900","title":"LncRNA SPRY4-IT1 regulates 16HBE cell malignant transformation induced by particulate matter through DUSP6-ERK1/2-Chk1 signaling pathway.","date":"2023","source":"Chemosphere","url":"https://pubmed.ncbi.nlm.nih.gov/37797900","citation_count":2,"is_preprint":false},{"pmid":"39313103","id":"PMC_39313103","title":"SPRY4 regulates ERK1/2 phosphorylation to affect oxidative stress and steroidogenesis in polycystic ovary syndrome.","date":"2024","source":"Steroids","url":"https://pubmed.ncbi.nlm.nih.gov/39313103","citation_count":2,"is_preprint":false},{"pmid":"36915750","id":"PMC_36915750","title":"Long noncoding RNA SPRY4-IT1 acts as a miR-101-5p sponge to promote gastrointestinal stromal tumor progression by inhibiting ZEB1.","date":"2023","source":"American journal of translational research","url":"https://pubmed.ncbi.nlm.nih.gov/36915750","citation_count":2,"is_preprint":false},{"pmid":"40660390","id":"PMC_40660390","title":"Exosomal SPRY4 from adipogenic BMSCs impairs angiogenesis via the PTPRB/TIE2/PI3K axis in Steroid-induced osteonecrosis of the femoral head.","date":"2025","source":"Stem cell research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/40660390","citation_count":2,"is_preprint":false},{"pmid":"37686663","id":"PMC_37686663","title":"SPRY4 as a Potential Mediator of the Anti-Tumoral Role of Macrophages in Anaplastic Thyroid Cancer Cells.","date":"2023","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/37686663","citation_count":2,"is_preprint":false},{"pmid":"41075905","id":"PMC_41075905","title":"CircPFKP orchestrates a novel competing endogenous RNA network to regulate SPRY4/p38-MAPK signaling and modulate papillary thyroid carcinoma aggressiveness.","date":"2025","source":"International journal of biological 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Most FGF17 and IL17RD mutations (the top-ranked candidates) altered protein function in vitro.\",\n      \"method\": \"Sequencing of 386 CHH individuals, functional in vitro assays for candidate mutations, bioinformatics interactome analysis (IBAS)\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic pathway placement with in vitro functional validation, single study\",\n      \"pmids\": [\"23643382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SPRY4 gene is a transcriptional target of the WNT/β-catenin signaling pathway; conserved double TCF/LEF-binding sites were identified in the 5′-promoter region of SPRY4 orthologs across mammals, establishing SPRY4 as an evolutionarily conserved negative feedback inhibitor of FGF/RTK signaling downstream of WNT activation in progenitor cells.\",\n      \"method\": \"Bioinformatics/comparative genomics identification of TCF/LEF binding sites; humint (literature integration)\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational/bioinformatics prediction without direct experimental validation of binding\",\n      \"pmids\": [\"16465403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Spry1 and Spry4 have opposing roles in human aortic vascular smooth muscle cell (VSMC) phenotype: Spry1 maintains the differentiated contractile state by sustaining Akt activation and myocardin expression via FoxO3a, while Spry4 suppresses VSMC differentiation marker expression by antagonizing both MAPK/ERK and Akt signaling. ChIP assays showed FoxO3a represses myocardin promoter activity, and Spry1/Spry4 modulate myocardin mRNA levels through this pathway.\",\n      \"method\": \"siRNA knockdown, ChIP assays, Western blotting for pathway components, phenotypic marker quantification in human VSMCs in vitro\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal KD experiments with ChIP and pathway readouts, single study\",\n      \"pmids\": [\"23554919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SPRY4 inhibits FGF2-induced ERK1/2 signaling in endometrial adenocarcinoma (Ishikawa) cells; plasmid-driven SPRY4 expression blocked FGF2-induced ERK1/2 activity as measured by luciferase reporter and Western blot, and significantly reduced cell proliferation including 17β-estradiol-induced proliferation.\",\n      \"method\": \"Luciferase reporter assay, Western blot, colony formation and cell counting assays in Ishikawa cells\",\n      \"journal\": \"Gynecological endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vitro functional assay with mechanistic readout, single study single lab\",\n      \"pmids\": [\"24811094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MT1-MMP negatively regulates SPRY4 transcription in melanoma cells through an MMP2/RAC1 axis; MT1-MMP knockdown increases SPRY4 mRNA and protein, and SPRY4 modulates MT1-MMP-dependent cell migration such that SPRY4 knockdown rescues impaired migration caused by MT1-MMP knockdown.\",\n      \"method\": \"Microarray gene expression, shRNA knockdown of MT1-MMP, qRT-PCR, Western blot, migration assays in melanoma cells\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, genetic epistasis via rescue experiment, single lab\",\n      \"pmids\": [\"26392417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KSRP (K-homology splicing regulatory protein), an AU-rich element-binding protein, promotes post-transcriptional destabilization of SPRY4 transcripts in non-small cell lung cancer cells; silencing KSRP decreased cell proliferation, reversed anchorage-independent growth, and reduced migration/invasion in a SPRY4-dependent manner.\",\n      \"method\": \"siRNA knockdown of KSRP, qRT-PCR measurement of SPRY4 transcript stability, functional assays (proliferation, migration, anchorage-independent growth)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic post-transcriptional regulation with functional consequence, single lab\",\n      \"pmids\": [\"28275056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SPRY4 knockdown in human MDA-MB-231 breast cancer cells increased cell proliferation and migration, elevated β3-integrin expression and CD133+CD44+ stem cell subpopulation, enhanced mammosphere formation, reduced paclitaxel sensitivity, and increased tumor initiation potency in vivo, identifying endogenous SPRY4 as a suppressor of cancer stem cell properties.\",\n      \"method\": \"Lentiviral shRNA knockdown, flow cytometry, mammosphere assay, limiting dilution xenograft, Western blotting\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple defined cellular and in vivo phenotypes, single lab\",\n      \"pmids\": [\"26973433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SPRY4 acts as a negative regulator of PKCα-mediated activation of MAPK, especially p38MAPK phosphorylation; miR-411-5p directly targets SPRY4, and SPRY4 siRNA or miR-411-5p overexpression both activate p38MAPK phosphorylation, promoting apoptosis and myogenic differentiation in rhabdomyosarcoma (RMS) cells. This establishes a TGF-β1/miR-411-5p/SPRY4/p38MAPK autoregulatory loop governing proliferation vs. differentiation.\",\n      \"method\": \"Luciferase reporter system, siRNA knockdown of SPRY4, miRNA overexpression, Western blot for p38MAPK phosphorylation, miRNA microarray, in vivo tumorigenicity assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct target validation by luciferase, multiple orthogonal methods, mechanistic pathway placement with in vivo confirmation\",\n      \"pmids\": [\"26291313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"IRF6 and SPRY4 signaling interact genetically in periderm development; crossing Irf6+/- mice with TgKRT14::Spry4 transgenic mice (which express Spry4 in the basal epithelial layer to reduce FGF/RTK signaling) produced a non-additive increase in oral epithelial adhesion severity, and the double mutant embryos showed abnormal GRHL3 expression at adhesion sites, placing SPRY4/RTK signaling and IRF6 in the same periderm differentiation pathway.\",\n      \"method\": \"Genetic epistasis (double mutant cross), quantitative oral adhesion assay, immunofluorescence for GRHL3 and K6 in mouse embryos\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via double mutant with quantitative phenotype, single study\",\n      \"pmids\": [\"28732181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SPRY4 binds directly to wild-type KIT and primary KIT mutants in gastrointestinal stromal tumors (GISTs), inhibiting KIT expression and activation and thereby decreasing cell survival and proliferation. SPRY4 also enhances the inhibitory effect of imatinib on primary KIT mutants but does not affect secondary drug-resistant KIT mutants, suggesting primary and secondary KIT mutants signal through different downstream cascades. Inhibition of SPRY4 in KITV558A/WT mice increased GIST tumorigenesis in vivo.\",\n      \"method\": \"Co-immunoprecipitation (protein binding), Western blot (KIT expression/activation), Ba/F3 and GIST-T1 cell assays, germline KITV558A/WT mouse model, imatinib sensitivity assays\",\n      \"journal\": \"Gastric cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct protein-protein interaction demonstrated by Co-IP, mechanistic consequence shown in vitro and in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"37222910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SPRY4 overexpression inhibited trophoblast (HTR8/SVneo) proliferation and promoted apoptosis in vitro; mechanistically, IFN-γ-induced STAT1 expression and activation (via PI3K/AKT pathway) were identified as downstream effectors of SPRY4 in regulating trophoblast proliferation and apoptosis, and IFN-γ upregulated SPRY4 expression. Both STAT1 and phospho-STAT1 were elevated in RM patient trophoblasts and positively correlated with SPRY4.\",\n      \"method\": \"siRNA knockdown and lentiviral overexpression of SPRY4, gene expression microarray, Western blot for STAT1/pSTAT1/pAKT, proliferation and apoptosis assays in HTR8/SVneo cells\",\n      \"journal\": \"American journal of reproductive immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway identification with gain/loss of function and microarray, single lab\",\n      \"pmids\": [\"32196809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SPRY4 knockdown in AIS (adolescent idiopathic scoliosis) bone marrow-derived MSCs impaired osteogenic differentiation, while SPRY4 overexpression in AIS MSCs enhanced it. SPRY4 contributes to osteogenic differentiation and melatonin response via MEK-ERK1/2-dependent signaling; melatonin upregulated SPRY4 and promoted osteogenesis, while SPRY4 ablation abolished these melatonin effects.\",\n      \"method\": \"siRNA knockdown, lentiviral overexpression, Western blot, qRT-PCR, osteogenic differentiation assays, melatonin treatment\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain/loss of function with defined pathway placement (MEK-ERK1/2), single lab\",\n      \"pmids\": [\"31645544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SPRY4 knockdown in human adipose-derived stem cells (hASCs) significantly enhanced osteogenic differentiation (ALP 2.3-fold, OPN 3.5-fold increase; increased calcium deposition) via induction of ERK1/2 phosphorylation, and promoted bone formation in ectopic and calvarial defect mouse models in vivo.\",\n      \"method\": \"siRNA knockdown (transient), Western blot, qRT-PCR, Alizarin red staining, microCT, histological analysis of ectopic and calvarial defect models\",\n      \"journal\": \"Tissue engineering. Part A\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in vitro and in vivo, single lab\",\n      \"pmids\": [\"30982407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SPRY4 suppresses ERK signaling downstream of RAS; SPRY4 overexpression suppressed proliferation and invasion of colorectal cancer cells, and the increased proliferation/invasion from SPRY4 silencing was reversed by EZH2 inhibition, placing SPRY4 upstream of EZH2 in CRC. SPRY4 overexpression also inhibited tumorigenesis in nude mice.\",\n      \"method\": \"SPRY4 overexpression/silencing plasmids, CCK-8, colony formation, EdU, wound healing, Transwell assays, flow cytometry, EZH2 inhibitor rescue, xenograft\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via inhibitor rescue with multiple functional assays and in vivo confirmation, single lab\",\n      \"pmids\": [\"33879635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MEF2D in complex with HDAC4 directly binds to the SPRY4 promoter and suppresses SPRY4 transcription, which relieves SPRY4-mediated inhibition of the MAPK/ERK signaling pathway and contributes to sorafenib resistance in hepatocellular carcinoma. HDAC4 inhibition restored SPRY4 expression and ERK inhibition, sensitizing tumor cells to sorafenib in vivo.\",\n      \"method\": \"ChIP assays (MEF2D/HDAC4 binding to SPRY4 promoter), Western blot, HDAC4 inhibitor treatment, mouse liver tumor model with sorafenib\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP directly demonstrates transcription factor binding to SPRY4 promoter, mechanistic consequence validated in vivo, multiple methods\",\n      \"pmids\": [\"34339801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SPRY4 overexpression in chondrocytes prevents hypertrophy, reduces senescence, ROS production, and ECM protease expression via regulation of the MAPK signaling pathway; SPRY4 knockdown in healthy chondrocytes caused all these pathological features. SPRY4 is downregulated in degenerated human cartilage and OA-model rat tissue.\",\n      \"method\": \"siRNA knockdown and lentiviral overexpression of SPRY4, histological analysis, Western blot, fluorescent ROS assay, DMM rat model\",\n      \"journal\": \"NPJ Regenerative medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain/loss of function with multiple cellular and in vivo readouts, single lab\",\n      \"pmids\": [\"34535669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LINC00675 competes with LSD1 binding and enhances the interaction of LSD1 with H3K4me2, reducing H3K4me2 enrichment at the SPRY4 promoter and suppressing SPRY4 transcription, thereby acting as a suppressor of gastric cancer cell proliferation and migration. RIP assay confirmed LINC00675-LSD1 interaction; ChIP assay verified reduced H3K4me2 at SPRY4 promoter.\",\n      \"method\": \"RIP, coIP, ChIP, RNA-sequencing, in vitro and in vivo functional assays\",\n      \"journal\": \"Molecular therapy. Nucleic acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple chromatin-based assays establishing epigenetic regulation of SPRY4 promoter, single lab\",\n      \"pmids\": [\"33230474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SPRY4 promotes adipogenic differentiation of human adipose-derived MSCs (hAMSCs) via activation of the MEK-ERK1/2 pathway; gain- and loss-of-function experiments demonstrated SPRY4 positively correlates with and causally promotes adipogenesis both in vitro and in vivo.\",\n      \"method\": \"Gain/loss-of-function (siRNA and overexpression), Western blot, qPCR, adipogenic differentiation assays in vitro, in vivo fat pad model\",\n      \"journal\": \"Adipocyte\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional functional assays with pathway identification, single lab\",\n      \"pmids\": [\"36082406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SPRY4 acts as an ERK-dependent negative feedback regulator of growth factor (GDNF and FGF2) signaling in mouse spermatogonial stem cells (SSCs); Spry4 mRNA is robustly induced by GDNF/FGF2, and Spry4 ablation dysregulates ERK MAPK downstream of RAS. Loss of Spry4 shifts SSC fate toward early differentiation with loss of stem cell activity, and a Spry4 reporter line showed strong Spry4 promoter activity demarcates the adult SSC population in vivo.\",\n      \"method\": \"Single-cell quantitative ERK MAPK signaling analysis, Spry4 KO cultures, Spry4 reporter mouse line, in vivo spermatogonial stem cell assays, qRT-PCR\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including single-cell signaling, KO, and in vivo reporter, mechanistic pathway placement replicated\",\n      \"pmids\": [\"37552049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A SPRY4 variant (c.157C>T, p.Arg53Trp) reduces SPRY4 protein levels in HEK293T cells and disrupts the redox system and mitochondrial function in mouse oocytes; Spry4-/- mice exhibit ovarian oxidative stress and decreased ovarian function. These phenotypes could be partially reversed by exogenous Nrf1 cRNA, identifying a role for SPRY4 in maintaining oocyte redox homeostasis and early embryonic developmental potential.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing, Western blot (protein level in HEK293T), cRNA injection in mouse oocytes, RNA sequencing, fluorescence/absorbance assays, ELISA, Spry4 KO mouse histology\",\n      \"journal\": \"Human reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional variant characterization with multiple orthogonal methods, in vitro and KO mouse in vivo validation\",\n      \"pmids\": [\"39348320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A SPRY4 variant (c.701C>T, p.Thr234Met) identified in familial nonmedullary thyroid cancer increases cell viability and colony formation; phosphokinase array and Western blot showed these effects are mediated through MAPK/ERK pathway activation, and cells with this variant showed higher responsiveness to a MEK inhibitor.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing, in vitro cell viability/colony formation assays, phosphokinase array, Western blot, MEK inhibitor treatment\",\n      \"journal\": \"Thyroid\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional variant with pathway identification using phosphokinase array and inhibitor, single lab\",\n      \"pmids\": [\"33906393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SPRY4 knockdown in PCOS mice normalized the estrous cycle, reduced serum androgens and LH/FSH ratio, alleviated ovarian oxidative stress, and restored steroidogenic enzyme expression by reducing ERK1/2 phosphorylation. ERK2 agonist (tBHQ) reversed the effects of SPRY4 knockdown, establishing that SPRY4 modulates oxidative stress and steroidogenesis via ERK1/2 phosphorylation in granulosa cells.\",\n      \"method\": \"Lentiviral SPRY4 knockdown in DHEA-induced PCOS mice, ERK2 agonist rescue, ELISA, Western blot, ROS/MDA/SOD assays, granulosa cell isolation\",\n      \"journal\": \"Steroids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation with signaling rescue in vivo and in vitro, single lab\",\n      \"pmids\": [\"39313103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Exosomal SPRY4 from adipogenic BMSCs impairs angiogenesis by directly interacting with PTPRB (receptor-type tyrosine phosphatase B), enhancing its phosphatase activity, thereby inhibiting TIE2 receptor autophosphorylation and downstream PI3K/AKT signaling. In vivo, SPRY4 overexpression exacerbated impaired bone mass and microvascular density in SONFH rat model; pharmacological modulation of PTPRB and PI3K reversed these effects.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, exosome co-culture, tube formation assay, Western blot, RNA-seq, in vivo SONFH rat model, HE staining, IHC\",\n      \"journal\": \"Stem cell research & therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct protein-protein interaction by Co-IP/MS, mechanistic consequence in vitro and in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"40660390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Germline-specific Spry4 deletion (Spry4 G-KO) in adult mice causes hyper-activation of MAPK/ERK in undifferentiated spermatogonia, reducing genome integrity after busulfan injury, unleashing excessive early spermatogenesis, and ultimately impairing SSC regeneration and fertility restoration. MEK1/2 inhibitor (PD0325901), but not rapamycin, rescued spermatogonial proliferation in Spry4 G-KO testes post-injury, confirming that SPRY4 controls an ERK-specific checkpoint for SSC recovery.\",\n      \"method\": \"Germline-specific Spry4 KO (conditional), busulfan injury model, MEK inhibitor (PD0325901) rescue, rapamycin comparison, Western blot, qRT-PCR for Id1/Cxcl12, fertility assays\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conditional KO with pharmacological rescue and pathway specificity demonstrated, multiple readouts in vivo\",\n      \"pmids\": [\"41852347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Spry4 knockout mice (spry4-/-) showed reduced inflammatory responses after spinal cord injury (SCI), including decreased TNFα secretion and reduced macrophage/neutrophil invasion into the lesion site, as well as attenuated astrocytic gliosis and increased neuronal survival, establishing that SPRY4-mediated suppression of FGF signaling limits pro-regenerative responses after SCI.\",\n      \"method\": \"Spry4-/- mouse model, histological analysis, cytokine measurements (TNFα), immunostaining for macrophage/neutrophil markers and GFAP, neuronal survival counting post-SCI\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotypes in vivo, single lab\",\n      \"pmids\": [\"25541251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Overexpression of the FGF negative feedback regulator Sprouty4 in the dental epithelium (K14-Spry4 transgenic mice) caused defects in cusp morphology, enamel irregularities, and delayed signaling center formation in the mouse molar, demonstrating that FGF signaling through SPRY4 feedback regulation controls tooth shape and enamel mineralization.\",\n      \"method\": \"Transgenic mouse overexpression (K14-Spry4), histological analysis, microCT, developmental staging of tooth morphogenesis\",\n      \"journal\": \"JBMR plus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transgenic gain-of-function with defined developmental phenotypes, single lab\",\n      \"pmids\": [\"31485553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SPRY4 mRNA directly confirmed as a target of miR-411-5p and miR-411-3p; miR-411 overexpression decreased SPRY4 expression and induced EGFR/AKT signaling activation and EMT in NSCLC, while SPRY4 knockdown phenocopied miR-411 overexpression, and SPRY4 restoration reversed the oncogenic effects.\",\n      \"method\": \"Luciferase reporter assay (direct target confirmation), Western blot, NSCLC cell proliferation/migration/apoptosis assays, in vivo tumor growth model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct luciferase validation of miR-SPRY4 interaction, phenotypic rescue by SPRY4 restoration, in vivo confirmation\",\n      \"pmids\": [\"30390072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SPRY4 knockdown in TGCT cell lines (833K and NT2-D1) resulted in decreased cell growth, migration, and invasion, and a significant reduction in Akt phosphorylation, indicating SPRY4 acts as an oncogene in TGCTs through activation of the PI3K/Akt signaling pathway.\",\n      \"method\": \"siRNA-mediated knockdown, Western blot for pAkt, cell growth, migration, and invasion assays in two TGCT cell lines\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional KD in two cell lines with defined signaling readout, single lab\",\n      \"pmids\": [\"29410498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-1293 knockdown attenuates lung adenocarcinoma-induced angiogenesis by de-repressing Spry4, which inhibits ERK1/2 phosphorylation and nuclear translocation, reducing VEGF-A and bFGF secretion. siRNA-mediated Spry4 perturbation abolished the ERK1/2 inhibition caused by miR-1293 knockdown, confirming the miR-1293/Spry4/ERK1/2 axis.\",\n      \"method\": \"miRNA knockdown, siRNA rescue, Western blot for pERK1/2 and nuclear/cytoplasm distribution, HUVEC tube formation, in vivo angiogenesis markers\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis confirmed by siRNA rescue with multiple angiogenesis readouts, single lab\",\n      \"pmids\": [\"38972427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SPRY2 and SPRY4 form homo- or hetero-oligomers; SPRY2 acts as a novel effector of K-Ras at the plasma membrane, and SPRY4 participates in these oligomeric complexes. Co-immunoprecipitation and BRET assays showed SPRY2-KRas interaction; relevance to SPRY4 is through its hetero-oligomerization with SPRY2.\",\n      \"method\": \"TurboID proximity proteomics, BRET assays, Co-immunoprecipitation, membrane anchorage inhibitors, interface mutagenesis\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — SPRY4 hetero-oligomerization is a secondary finding in a SPRY2-focused study; single preprint\",\n      \"pmids\": [\"bio_10.1101_2025.06.13.659437\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"SPRY4 is a negative feedback inhibitor of receptor tyrosine kinase (RTK)/MAPK-ERK signaling that is induced by FGF, GDNF, and other growth factors; it acts by suppressing RAS-dependent ERK phosphorylation and also interacts directly with KIT and PTPRB to modulate their activation, thereby regulating cell proliferation, differentiation, migration, and stem cell self-renewal across multiple cell types, while its transcription is controlled by WNT/TCF-LEF, MEF2D/HDAC4, and LSD1-mediated epigenetic mechanisms.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SPRY4 is a negative feedback regulator of receptor tyrosine kinase (RTK) signaling that suppresses RAS-dependent ERK/MAPK and, in certain contexts, PI3K/AKT pathway activation to control cell proliferation, differentiation, migration, and stem cell self-renewal. Induced transcriptionally by FGF, GDNF, and other growth factors, SPRY4 inhibits ERK1/2 phosphorylation downstream of FGFR, EGFR, and KIT, and also directly binds KIT to inhibit its activation and PTPRB to enhance its phosphatase activity against TIE2, thereby suppressing angiogenic PI3K/AKT signaling [PMID:37222910, PMID:40660390, PMID:37552049, PMID:24811094]. SPRY4 transcription is itself regulated by the MEF2D/HDAC4 repressor complex and by LSD1-mediated H3K4me2 demethylation at its promoter, while its mRNA is destabilized by KSRP and targeted by miR-411-5p and miR-1293, enabling multilayered control of its expression in cancer and development [PMID:34339801, PMID:33230474, PMID:28275056, PMID:26291313]. Loss-of-function mutations in SPRY4 have been identified in congenital hypogonadotropic hypogonadism patients, and Spry4-null mice show defects in spermatogonial stem cell maintenance, oocyte redox homeostasis, and ovarian function, establishing SPRY4 as essential for reproductive biology [PMID:23643382, PMID:41852347, PMID:39348320].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"The question of how SPRY4 transcription is linked to developmental signaling was addressed by identifying conserved TCF/LEF binding sites in the SPRY4 promoter, placing it as a potential WNT-responsive gene.\",\n      \"evidence\": \"Comparative genomics across mammalian SPRY4 orthologs identified double TCF/LEF-binding elements\",\n      \"pmids\": [\"16465403\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Computational prediction without experimental validation of TCF/LEF binding or transcriptional activation\", \"No ChIP or reporter assay confirmation\", \"No functional consequence of WNT-mediated SPRY4 induction tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Two key advances established SPRY4's physiological significance: its genetic association with congenital hypogonadotropic hypogonadism placed it in the FGF8-FGFR1 signaling axis controlling GnRH neuron development, while its opposing role to SPRY1 in vascular smooth muscle cells revealed that SPRY4 suppresses both ERK and Akt to inhibit differentiation.\",\n      \"evidence\": \"Sequencing of 386 CHH patients with in vitro functional assays for mutations; siRNA knockdown with ChIP and Western blot in human VSMCs\",\n      \"pmids\": [\"23643382\", \"23554919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CHH mutations not shown to be fully causative (oligogenic model)\", \"VSMC findings from a single lab without independent replication\", \"Molecular mechanism of SPRY4 dual ERK/Akt inhibition in VSMCs not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Direct functional evidence confirmed that SPRY4 inhibits FGF2-stimulated ERK1/2 signaling and cell proliferation, while Spry4 knockout mice revealed an unexpected role in modulating inflammatory responses after spinal cord injury.\",\n      \"evidence\": \"Luciferase reporter and Western blot in endometrial cancer cells; Spry4−/− mice with SCI histology and cytokine measurements\",\n      \"pmids\": [\"24811094\", \"25541251\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endometrial cancer study used overexpression only without KD validation\", \"SCI phenotype mechanism (which RTK pathway) not dissected\", \"No direct biochemical mechanism of ERK inhibition identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Multiple studies revealed that SPRY4 expression is tightly regulated post-transcriptionally and by microRNAs, and that endogenous SPRY4 suppresses cancer stem cell properties: KSRP destabilizes SPRY4 mRNA in NSCLC, miR-411-5p directly targets SPRY4 to relieve p38MAPK inhibition in rhabdomyosarcoma, and SPRY4 knockdown expands the CD133+CD44+ stem cell population in breast cancer.\",\n      \"evidence\": \"siRNA knockdown of KSRP with mRNA stability assays; luciferase reporter validation of miR-411-5p targeting SPRY4 3′UTR; lentiviral shRNA with flow cytometry and limiting dilution xenograft\",\n      \"pmids\": [\"28275056\", \"26291313\", \"26973433\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Post-transcriptional regulation by KSRP not confirmed across cell types\", \"p38MAPK regulation by SPRY4 contrasts with canonical ERK-centered models — specificity unclear\", \"Cancer stem cell findings from a single triple-negative breast cancer line\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genetic epistasis between Spry4 and Irf6 in mouse embryos demonstrated that SPRY4-mediated RTK/FGF feedback regulation cooperates with IRF6 in periderm differentiation, with compound mutants showing synergistic oral epithelial adhesion defects.\",\n      \"evidence\": \"Double mutant cross (Irf6+/− × TgKRT14::Spry4) with quantitative adhesion scoring and GRHL3 immunofluorescence\",\n      \"pmids\": [\"28732181\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Only Spry4 gain-of-function tested; Spry4 loss-of-function epistasis with Irf6 not examined\", \"Downstream target of SPRY4 in periderm not identified beyond GRHL3 mislocalization\", \"Single developmental context\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Direct protein-protein interaction between SPRY4 and KIT was demonstrated, showing that SPRY4 inhibits KIT expression and activation in GISTs and enhances imatinib sensitivity for primary but not secondary KIT mutants, while miR-411 was confirmed to target SPRY4 mRNA to activate EGFR/AKT signaling in NSCLC.\",\n      \"evidence\": \"Co-immunoprecipitation of SPRY4-KIT, Ba/F3 and GIST-T1 cell assays, KITV558A/WT mouse model; luciferase reporter for miR-411/SPRY4 with phenotypic rescue in NSCLC cells and xenografts\",\n      \"pmids\": [\"37222910\", \"30390072\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SPRY4-KIT binding domain not mapped\", \"Whether SPRY4 binds other RTKs besides KIT via the same mechanism is unknown\", \"miR-411 studies do not address SPRY4-independent miR-411 targets\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"SPRY4's role in stem cell differentiation was extended to osteogenesis and tooth development: SPRY4 knockdown in adipose-derived stem cells enhanced osteogenic differentiation via ERK1/2, while transgenic Spry4 overexpression in dental epithelium disrupted cusp morphology and enamel mineralization, and SPRY4 promoted osteogenesis in AIS mesenchymal stem cells downstream of melatonin signaling.\",\n      \"evidence\": \"siRNA KD with in vivo bone formation models; K14-Spry4 transgenic mice with microCT; gain/loss-of-function in AIS MSCs\",\n      \"pmids\": [\"30982407\", \"31485553\", \"31645544\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Opposing effects of SPRY4 on osteogenesis in different MSC sources (enhances in AIS MSCs, inhibits in hASCs) not reconciled\", \"Melatonin-SPRY4 axis mechanism not fully delineated\", \"Tooth phenotype not linked to specific downstream targets\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Transcriptional and epigenetic control of SPRY4 was mechanistically resolved: MEF2D/HDAC4 directly binds and represses the SPRY4 promoter to drive sorafenib resistance in hepatocellular carcinoma, while LINC00675 redirects LSD1 to demethylate H3K4me2 at the SPRY4 promoter in gastric cancer, and SPRY4 was placed upstream of EZH2 in colorectal cancer signaling.\",\n      \"evidence\": \"ChIP for MEF2D/HDAC4 at SPRY4 promoter with HDAC4 inhibitor rescue in vivo; RIP/ChIP for LINC00675-LSD1-H3K4me2 axis; EZH2 inhibitor rescue of SPRY4-silenced CRC cells with xenograft\",\n      \"pmids\": [\"34339801\", \"33230474\", \"33879635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MEF2D/HDAC4 and LSD1-mediated mechanisms operate in the same tissues is untested\", \"EZH2 as downstream effector of SPRY4 lacks direct biochemical evidence of connection\", \"Chromatin regulation of SPRY4 in non-cancer contexts unexplored\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Single-cell signaling analysis in spermatogonial stem cells established that SPRY4 is an ERK-specific negative feedback regulator induced by GDNF/FGF2 that maintains stem cell identity by preventing premature differentiation, while a miR-1293/SPRY4/ERK1/2 axis was shown to control tumor-associated angiogenesis.\",\n      \"evidence\": \"Single-cell ERK analysis in Spry4 KO SSC cultures, Spry4 reporter mouse; miR-1293 KD with SPRY4 siRNA rescue and HUVEC tube formation\",\n      \"pmids\": [\"37552049\", \"38972427\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SPRY4 controls SSC self-renewal versus differentiation balance cell-autonomously versus via niche signals not resolved\", \"miR-1293/SPRY4 axis tested only in lung adenocarcinoma context\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"SPRY4's direct interaction partners were expanded and reproductive functions solidified: exosomal SPRY4 binds PTPRB to enhance its phosphatase activity against TIE2 and suppress angiogenic PI3K/AKT signaling, a SPRY4 coding variant disrupts oocyte redox homeostasis and mitochondrial function with partial rescue by Nrf1, and a familial thyroid cancer variant activates MAPK/ERK signaling.\",\n      \"evidence\": \"Co-IP/mass spectrometry for SPRY4-PTPRB with in vivo SONFH rat model; Spry4−/− mice with oocyte ROS/mitochondrial assays and Nrf1 cRNA rescue; phosphokinase array for SPRY4 Thr234Met variant in thyroid cancer cells\",\n      \"pmids\": [\"40660390\", \"39348320\", \"33906393\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SPRY4-PTPRB binding interface not mapped\", \"Whether Nrf1-mediated rescue of oocyte defects reflects a direct SPRY4-Nrf1 regulatory axis or parallel pathway is unclear\", \"Thyroid cancer variant functional effect tested in a single cell line\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Germline-specific Spry4 conditional knockout confirmed that SPRY4 provides an ERK-specific checkpoint essential for spermatogonial stem cell recovery after injury, with MEK1/2 inhibitor rescue demonstrating pathway specificity over mTOR.\",\n      \"evidence\": \"Conditional Spry4 G-KO with busulfan injury, PD0325901 rescue versus rapamycin control, fertility assays\",\n      \"pmids\": [\"41852347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream ERK substrates mediating SSC recovery not identified\", \"Whether SPRY4's checkpoint function operates in female germline stem cells is untested\", \"Long-term fertility restoration after MEK inhibitor withdrawal not assessed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of SPRY4's interactions with KIT, PTPRB, and other RTKs, the molecular mechanism by which SPRY4 inhibits RAS-ERK signaling (direct RAS binding versus adaptor sequestration versus other), and how SPRY4 oligomerization with other Sprouty family members modulates its activity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal structure or cryo-EM structure of SPRY4 or its complexes\", \"Whether SPRY4 directly binds RAS (as suggested for SPRY2) has not been demonstrated\", \"Tissue-specific and context-dependent switching between tumor suppressor and oncogenic functions lacks a unifying mechanistic model\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 7, 9, 13, 18, 22, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 9, 22]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [3, 7, 9, 13, 18, 22, 23, 26]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 18, 23, 25]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 13, 14, 20, 26]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"KIT\",\n      \"PTPRB\",\n      \"SPRY2\",\n      \"MEF2D\",\n      \"HDAC4\",\n      \"KSRP\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}