{"gene":"SOCS6","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":2002,"finding":"SOCS6 binds to elongins B and C through its SOCS box, suggesting it acts as an E3 ubiquitin ligase. The SH2 domains of SOCS6 (and SOCS7) preferentially bind phosphopeptides with valine at pY+1 and hydrophobic residues at pY+2/+3. SOCS6 interacts with a protein complex consisting of IRS-4, IRS-2, and the p85 regulatory subunit of PI3K. SOCS6-knockout mice weigh ~10% less than wild-type littermates.","method":"Biochemical binding assays, phosphopeptide binding specificity studies, Co-IP, gene knockout mouse model","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (biochemistry + genetics) in a foundational study","pmids":["12052866"],"is_preprint":false},{"year":2001,"finding":"SOCS-1 and SOCS-6 interact with the insulin receptor (IR) in hepatoma cells; SOCS-6 association with the IR requires insulin treatment. Neither protein inhibits IR autophosphorylation, but both inhibit insulin-dependent activation of ERK1/2 and protein kinase B in vivo and IR-directed phosphorylation of IRS-1 in vitro, suggesting a mechanism for cytokine-induced insulin resistance.","method":"Co-immunoprecipitation in HepG2/rat hepatoma cells, in vitro IR kinase assay, in vivo signaling assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus in vitro kinase assay plus in vivo signaling readouts","pmids":["11342531"],"is_preprint":false},{"year":2004,"finding":"SOCS6 binds directly to KIT receptor at phosphotyrosine 567 in the juxtamembrane domain. Ectopic SOCS6 expression decreases SCF-induced cell proliferation and reduces SCF-induced activation of ERK1/2 and p38, but not AKT or STATs, identifying SOCS6 as a selective negative regulator of KIT-MAPK signaling.","method":"KIT mutant constructs and synthetic peptides, stable cell line expression, Western blot signaling assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — direct binding mapped to specific tyrosine with mutagenesis, functional signaling validation","pmids":["14707129"],"is_preprint":false},{"year":2004,"finding":"Insulin stimulation induces SOCS-6 expression and interaction of SOCS-6 with the monomeric p85 subunit of class-Ia PI3K (but not p85/p110 dimers). SOCS-6 transgenic mice show improved glucose metabolism and potentiated Akt phosphorylation. SOCS-6 protein is degraded via the proteasome after insulin induction, while SOCS-6-associated p85 is not degraded.","method":"SOCS-6 transgenic mice, Co-IP, Western blot, proteasome inhibitor experiments, insulin stimulation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — transgenic mouse model combined with biochemical interaction mapping and proteasome studies","pmids":["15123678"],"is_preprint":false},{"year":2006,"finding":"The E3 ubiquitin ligase HOIL-1 interacts with SOCS6 via its Ubl domain binding to the SH2 and SOCS-box domains of SOCS6. HOIL-1 expression stabilizes SOCS6 and induces ubiquitination and degradation of SOCS6-associated proteins, indicating SOCS proteins can interact with E3 ubiquitin ligases beyond the canonical Elongin BC complex.","method":"Co-IP, ubiquitination assays, domain mapping with deletion mutants","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP and ubiquitination assays from a single lab","pmids":["16643902"],"is_preprint":false},{"year":2006,"finding":"SOCS6 protein stability is increased by PMA treatment through a PKCδ→ERK pathway. The N-terminal region of SOCS6 is required for this stabilization. Insulin and PDGF also increase endogenous SOCS6 stability through ERK activation.","method":"Ectopic expression in HEK293T and MCF7 cells, pharmacological inhibitors of PKC and ERK, Western blot stability assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — pharmacological pathway dissection, single lab, multiple cell lines","pmids":["17210122"],"is_preprint":false},{"year":2007,"finding":"SOCS6 localizes to both nucleus and cytoplasm; nuclear localization is dependent on amino acids 1–210 in the N-terminal region. The C-terminal region of SOCS6 is required for decreasing nuclear Stat3 protein levels, identifying two functionally distinct domains.","method":"GFP-tagged truncation constructs, confocal microscopy, subcellular fractionation, Western blot","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — localization with domain truncations from a single lab","pmids":["17603019"],"is_preprint":false},{"year":2009,"finding":"SOCS6 acts as a negative regulator of T cell activation by binding to the kinase domain of active p56lck (identified via yeast two-hybrid). SOCS6 binds specifically to the constitutively active F505 form of p56lck but not wild-type. Upon TCR stimulation, SOCS6 is recruited to the immunological synapse, promotes p56lck ubiquitination and proteasomal degradation, and represses TCR-dependent IL-2 promoter activity.","method":"Yeast two-hybrid, Co-IP, confocal microscopy, ubiquitination assay, IL-2 reporter assay in Jurkat T cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Y2H, Co-IP, microscopy, functional reporter), mechanistically rigorous","pmids":["20007709"],"is_preprint":false},{"year":2009,"finding":"SOCS6 is down-regulated in gastric cancer via allelic loss and promoter hypermethylation. Ectopic SOCS6 expression suppresses cell growth and colony formation and triggers the intrinsic apoptotic pathway, accompanied by decreased mitochondrial membrane potential.","method":"Methylation analysis, ectopic expression, colony formation assay, mitochondrial membrane potential assay, apoptosis assay","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2/3 — functional rescue with ectopic expression and mechanistic apoptotic readout, single lab","pmids":["19646809"],"is_preprint":false},{"year":2010,"finding":"Crystal structure of the SOCS6 SH2 domain bound to the c-KIT pY568 peptide (residues 564–574) at 1.45 Å resolution reveals a highly complementary interface with high affinity (Kd = 0.3 μM). The SH2 binding pocket extends to pY+6 and a large BG loop insertion contributes significantly to substrate specificity. SOCS6 has E3 ubiquitin ligase activity toward c-KIT and regulates c-KIT protein turnover in cells.","method":"X-ray crystallography, surface plasmon resonance (binding affinity), ubiquitination assay, cell-based KIT turnover assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure at high resolution combined with binding affinity measurements and functional ubiquitination assays","pmids":["21030588"],"is_preprint":false},{"year":2012,"finding":"SOCS6 promotes mitochondrial fission by forming a complex with DRP1 and the mitochondrial phosphatase PGAM5, attenuating DRP1 phosphorylation and promoting DRP1 mitochondrial translocation. SOCS6 targets to mitochondria and induces mitochondrial fragmentation, leading to intrinsic apoptosis (Bax conformational change, mitochondrial targeting, oligomerization). Mutation analysis shows SOCS6-mediated apoptosis is coupled to its ability to induce mitochondrial fission.","method":"Lentiviral knockdown, Co-IP, mutagenesis, confocal microscopy, Bax oligomerization assay, DRP1 phosphorylation/localization assays","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with mutagenesis establishing functional coupling","pmids":["22955947"],"is_preprint":false},{"year":2012,"finding":"SOCS6 binds directly to phosphotyrosines 591 and 919 of Flt3 upon ligand stimulation (identified by phosphopeptide fishing). SOCS6 enhances Flt3 ubiquitination, internalization, and degradation, and reduces Erk1/2 (but not Akt) activation. SOCS6 absence promotes cell proliferation induced by oncogenic Flt3-ITD. SOCS6 itself undergoes tyrosine phosphorylation upon Flt3 stimulation.","method":"Phosphopeptide fishing, Co-IP, ubiquitination assay, receptor internalization/degradation assay, stable Ba/F3 and UT-7 cell lines, Western blot signaling","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — phosphopeptide binding site mapping combined with multiple functional assays in two cell lines","pmids":["22952242"],"is_preprint":false},{"year":2014,"finding":"SOCS6 selectively suppresses receptor tyrosine kinase signaling. SOCS6 negatively regulates RTK signaling by promoting ubiquitination-mediated receptor degradation and induces apoptosis by targeting mitochondrial proteins, functioning as an E3 ubiquitin ligase adaptor through its SOCS box with Elongin BC and as an SH2-domain-containing substrate recognition module.","method":"Review/synthesis integrating previous Co-IP, ubiquitination, and functional data","journal":"Tumour biology","confidence":"Medium","confidence_rationale":"Tier 3 — review/synthesis, not primary experimental data","pmids":["25172101"],"is_preprint":false},{"year":2017,"finding":"Combined loss of SOCS6 and SOCS7 in mice recapitulates the cortical layer inversion seen in reeler mice (lacking Reelin), with dramatic increase in DAB1 in the cortex. SOCS6 and SOCS7 SH2 domains bind DAB1 ex vivo; DAB1 mutation diminishes binding and protects from SOCS6-mediated degradation. Phosphorylated DAB1 is elevated in SOCS6/7 double-knockout cortical neurons. Thus SOCS6 terminates Reelin signaling by promoting DAB1 degradation.","method":"Single and double knockout mice, ex vivo SH2 domain binding assays, DAB1 mutagenesis, immunofluorescence, Western blot","journal":"Cerebral cortex","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in vivo with biochemical binding and mutagenesis validation","pmids":["26503265"],"is_preprint":false},{"year":2021,"finding":"SOCS6 promotes radiosensitivity in esophageal squamous cell carcinoma (ESCC) by ubiquitinating and degrading c-Kit. SOCS6 and c-Kit colocalize in the cytoplasm. SOCS6 overexpression decreases cancer stem cell populations (CD271+, CD24low/CD44high), and inhibits tumor growth in xenograft models. SOCS6 deficiency increases radioresistance by enhancing G2/M arrest, DNA damage repair, and inhibiting apoptosis; SOCS6 transcription is partially p53-dependent.","method":"CoIP, ubiquitination assay, immunofluorescence/confocal microscopy, flow cytometry, sphere formation, xenograft, transcriptome sequencing","journal":"Cancer cell international / Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — CoIP plus ubiquitination assay plus in vivo xenograft with multiple functional readouts","pmids":["33712005","33689885"],"is_preprint":false},{"year":2022,"finding":"SOCS6 promotes mitochondrial fission and cardiomyocyte apoptosis in hypoxia/reoxygenation injury. SOCS6 is a direct target of miR-19b; Quaking (QK) RNA-binding protein regulates miR-19b expression, placing QK upstream of miR-19b/SOCS6 in cardiomyocyte I/R injury. SOCS6 inhibition by RNA interference attenuates H/R-induced mitochondrial fission and apoptosis.","method":"Dual-luciferase reporter assay, RNA interference, Western blot, in vivo mouse I/R model, apoptosis assays","journal":"Oxidative medicine and cellular longevity","confidence":"Medium","confidence_rationale":"Tier 2/3 — luciferase validation, KD phenotype, in vivo model; single lab","pmids":["35126805"],"is_preprint":false},{"year":2020,"finding":"The BC-box motif of SOCS6 (sequence SLQYLCRFVI, the elongin BC binding site) is sufficient to promote GABAergic neuronal differentiation of epidermal stem cells via ubiquitination of JAK2 and inhibition of the JAK2-STAT3 pathway.","method":"Intracellular peptide delivery, Western blot for JAK2 ubiquitination, JAK2/STAT3 pathway readouts, in vivo transplantation in ischemic rat brain","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 3 — peptide-based mechanistic study with functional pathway readout; single lab","pmids":["32668737"],"is_preprint":false},{"year":2025,"finding":"The N6-methyladenosine demethylase FTO binds and demethylates m6A modifications within the coding sequence of SOCS6 mRNA, reducing SOCS6 mRNA stability and protein expression. This FTO/SOCS6-m6A axis activates inflammatory programs (IL-1β, S100A8, S100A9) in keratinocytes, linking obesity-associated FTO upregulation to atopic dermatitis pathology.","method":"Transcriptomic and epitranscriptomic sequencing, Me-RIP assay, Western blot, RNA stability assays, topical FTO knockdown in vivo","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 — Me-RIP confirms m6A site, mRNA stability assays validate mechanism; single lab","pmids":["41644088"],"is_preprint":false},{"year":2025,"finding":"SOCS6 promotes ubiquitin-proteasomal degradation of SLC7A11 (xCT), reducing intracellular glutathione and augmenting ROS and Fe2+ accumulation to drive ferroptosis in ovarian cancer cells. SOCS6 also suppresses de novo fatty acid synthesis by downregulating FASN and ACC enzymes.","method":"Co-IP, ubiquitination assay, GSH/ROS/Fe2+ measurements, lipid synthesis enzyme Western blot, xenograft model","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2/3 — CoIP/ubiquitination assay with mechanistic downstream readouts; single lab","pmids":["41061872"],"is_preprint":false},{"year":2025,"finding":"LncRNA CASC2 (from retinal pigment epithelial cell exosomes) stabilizes SOCS6 mRNA via recruitment of the RNA-binding protein U2AF2, thereby inhibiting M1 macrophage polarization and promoting M2 polarization. This CASC2/U2AF2/SOCS6 axis attenuates diabetic retinopathy in vitro and in vivo.","method":"RNA immunoprecipitation (RIP), dual-luciferase reporter assay, Western blot, flow cytometry for macrophage polarization, in vivo diabetic rat model","journal":"Diabetic medicine","confidence":"Medium","confidence_rationale":"Tier 2/3 — RIP confirms U2AF2-SOCS6 mRNA interaction; mRNA stability and in vivo validation; single lab","pmids":["40065730"],"is_preprint":false},{"year":2014,"finding":"miR-155 directly targets the SOCS6 3'-UTR, repressing SOCS6 protein and mRNA; sustained miR-155 overexpression activates STAT3 and promotes tamoxifen resistance in breast cancer. Reintroduction of SOCS6 cDNA lacking the 3'-UTR abrogates miR-155-induced cell survival, establishing a miR-155/SOCS6/STAT3 axis.","method":"Luciferase reporter assay, Western blot, miRNA mimic/inhibitor transfection, SOCS6 rescue experiment","journal":"American journal of translational research","confidence":"Medium","confidence_rationale":"Tier 3 — luciferase validation plus rescue experiment; single lab","pmids":["26692956"],"is_preprint":false},{"year":2013,"finding":"miR-424-5p directly suppresses SOCS6 expression in pancreatic cancer (confirmed by luciferase reporter assay) and activates the ERK1/2 signaling pathway downstream of SOCS6 suppression.","method":"Luciferase reporter assay, qRT-PCR, Western blot, miR-424-5p inhibition and SOCS6 overexpression functional studies","journal":"Pathology oncology research","confidence":"Medium","confidence_rationale":"Tier 3 — luciferase validation plus signaling pathway readout; single lab","pmids":["23653113"],"is_preprint":false},{"year":2017,"finding":"miR-494-3p overexpression in primary myelofibrosis HSPCs promotes megakaryocytopoiesis by targeting SOCS6 (confirmed by luciferase assay); SOCS6 silencing in normal HSPCs mimics this phenotype and activates STAT3. miR-494-3p inhibition in PMF HSPCs upregulates SOCS6 and impairs aberrant megakaryocyte differentiation.","method":"Luciferase reporter assay, Western blot, gene expression profiling, SOCS6 siRNA knockdown, miRNA inhibition in patient-derived HSPCs","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2/3 — validated in patient-derived primary cells with multiple methods; single lab","pmids":["28423484"],"is_preprint":false},{"year":2024,"finding":"Japanese eel AjSOCS6 (with conserved SH2 and SOCS box domains) localizes to the cytoplasm and negatively regulates both MyD88-dependent NF-κB signaling and the type I IFN signaling pathway. Co-transfection with AjMyD88 reduced NF-κB luciferase activity, and knockdown upregulated immune gene expression in vivo.","method":"Subcellular localization (fluorescence), NF-κB luciferase reporter assay, co-transfection with MyD88, siRNA knockdown in vitro and in vivo","journal":"Fish & shellfish immunology","confidence":"Medium","confidence_rationale":"Tier 3 — functional reporter and knockdown; ortholog study in teleost fish","pmids":["39276815"],"is_preprint":false}],"current_model":"SOCS6 is an E3 ubiquitin ligase adaptor protein whose SH2 domain selectively recognizes phosphotyrosine motifs (preferring pY+1 Val) on receptor tyrosine kinases (c-KIT pY568/pY567, Flt3 pY591/pY919, insulin receptor) and cytoplasmic substrates (p56lck, DAB1, SLC7A11), recruiting the Elongin BC–Cullin5 scaffold via its SOCS box to drive ubiquitin-proteasomal degradation of these targets, thereby negatively regulating KIT/Flt3/insulin receptor signaling, MAPK-ERK activation, STAT3 levels, Reelin pathway termination (through DAB1 degradation required for cortical neuron layering), and T cell activation (through lck degradation), while also localizing to mitochondria where it forms a complex with DRP1 and PGAM5 to promote mitochondrial fission and intrinsic apoptosis; protein stability is regulated by the PKCδ–ERK pathway and by m6A demethylation of its mRNA by FTO."},"narrative":{"teleology":[{"year":2001,"claim":"The first mechanistic link between SOCS6 and insulin signaling was established, showing that SOCS6 binds the insulin receptor after stimulation and inhibits downstream ERK1/2 and PKB activation without blocking receptor autophosphorylation, placing SOCS6 as a post-receptor negative regulator.","evidence":"Co-immunoprecipitation in HepG2 and rat hepatoma cells with in vitro kinase and in vivo signaling assays","pmids":["11342531"],"confidence":"High","gaps":["Mechanism of SOCS6 recruitment to the IR (specific phosphotyrosine site) was undefined","Ubiquitination of the IR by SOCS6 was not tested"]},{"year":2002,"claim":"Biochemical characterization revealed that SOCS6 binds Elongin BC through its SOCS box (establishing E3 ligase adaptor function) and that its SH2 domain selects phosphopeptides with pY+1 Val, defining the substrate-recognition logic; knockout mice showed a growth defect but no overt metabolic phenotype.","evidence":"Phosphopeptide binding specificity assays, Co-IP with Elongins, SOCS6-knockout mouse phenotyping","pmids":["12052866"],"confidence":"High","gaps":["No direct ubiquitination substrate was identified","The mild knockout phenotype suggested functional redundancy with SOCS7"]},{"year":2004,"claim":"SOCS6 was mapped to specific RTK substrates: it binds c-KIT at pY567 and selectively suppresses KIT-driven ERK and p38 signaling, while in a parallel study SOCS6 was shown to modulate PI3K signaling by sequestering monomeric p85 and improving glucose metabolism in transgenic mice.","evidence":"KIT phosphotyrosine mutagenesis, SOCS6-transgenic mice, Co-IP for p85 interaction, proteasome inhibitor experiments","pmids":["14707129","15123678"],"confidence":"High","gaps":["Whether SOCS6 directly ubiquitinates KIT was not shown at this stage","The distinct roles of SOCS6 in RTK versus insulin signaling remained unresolved"]},{"year":2006,"claim":"SOCS6 protein stability was shown to be positively regulated by a PKCδ–ERK pathway, and an alternative E3 ligase partner (HOIL-1) was found to interact with and stabilize SOCS6, expanding the regulatory network beyond the canonical Elongin BC–Cullin 5 complex.","evidence":"Pharmacological inhibitors in HEK293T/MCF7 cells; Co-IP and ubiquitination assays for HOIL-1 interaction","pmids":["17210122","16643902"],"confidence":"Medium","gaps":["Physiological significance of the HOIL-1 interaction was not demonstrated in vivo","Whether PKCδ-ERK stabilization creates a feedback loop on SOCS6 target turnover was not tested"]},{"year":2007,"claim":"Domain-mapping studies revealed that SOCS6 shuttles between the nucleus and cytoplasm, with N-terminal residues 1–210 directing nuclear entry and the C-terminal region required for reducing nuclear STAT3 levels, indicating SOCS6 can regulate transcription factor abundance in the nucleus.","evidence":"GFP-truncation constructs, confocal microscopy, subcellular fractionation in transfected cells","pmids":["17603019"],"confidence":"Medium","gaps":["Whether SOCS6 ubiquitinates nuclear STAT3 directly was not tested","Nuclear function of SOCS6 was not validated in primary cells"]},{"year":2009,"claim":"SOCS6 was identified as a negative regulator of T cell activation: it binds constitutively active p56lck, promotes its ubiquitination and proteasomal degradation at the immunological synapse, and suppresses IL-2 promoter activity, establishing SOCS6 as a checkpoint in TCR signaling.","evidence":"Yeast two-hybrid, Co-IP, confocal microscopy, ubiquitination assay, IL-2 luciferase reporter in Jurkat T cells","pmids":["20007709"],"confidence":"High","gaps":["In vivo T cell phenotype of SOCS6 loss was not examined","Whether SOCS6 targets wild-type lck under physiological TCR stimulation remained unclear"]},{"year":2010,"claim":"A 1.45 Å crystal structure of the SOCS6 SH2 domain bound to c-KIT pY568 peptide revealed the molecular basis for substrate selectivity, including an extended binding groove to pY+6 and a large BG loop insertion, while functional assays confirmed SOCS6 E3 ligase activity toward c-KIT in cells.","evidence":"X-ray crystallography, surface plasmon resonance (Kd = 0.3 μM), in-cell ubiquitination and turnover assays","pmids":["21030588"],"confidence":"High","gaps":["Full-length SOCS6 structure was not determined","The structural basis for the Elongin BC–Cullin 5 interface of SOCS6 remained unresolved"]},{"year":2012,"claim":"Two major advances broadened SOCS6 biology: (1) SOCS6 was shown to bind Flt3 at pY591/pY919, promoting its ubiquitination, internalization, and degradation to suppress oncogenic Flt3-ITD–driven proliferation; (2) SOCS6 was found to target mitochondria, complex with DRP1 and PGAM5, attenuate DRP1 phosphorylation, and promote mitochondrial fission coupled to intrinsic apoptosis.","evidence":"Phosphopeptide fishing and multiple functional assays in Ba/F3 and UT-7 cells (Flt3); Co-IP, mutagenesis, confocal microscopy, Bax oligomerization assays (mitochondrial fission)","pmids":["22952242","22955947"],"confidence":"High","gaps":["Whether SOCS6 ubiquitinates DRP1 or PGAM5 was not established","The relative contribution of mitochondrial versus RTK functions to SOCS6-dependent apoptosis was unclear"]},{"year":2017,"claim":"Genetic evidence in SOCS6/SOCS7 double-knockout mice demonstrated that SOCS6 is essential for terminating Reelin signaling during cortical development by promoting DAB1 degradation; loss of both SOCS proteins phenocopied the reeler cortical inversion.","evidence":"Single and double knockout mice, ex vivo SH2-domain binding assays, DAB1 mutagenesis, immunofluorescence","pmids":["26503265"],"confidence":"High","gaps":["The individual contributions of SOCS6 versus SOCS7 to DAB1 degradation were not fully separable","Downstream transcriptional consequences of sustained DAB1 in cortical neurons were not defined"]},{"year":2021,"claim":"In cancer contexts, SOCS6 was shown to ubiquitinate and degrade c-KIT to promote radiosensitivity in esophageal squamous cell carcinoma, reducing cancer stem cell populations in a partially p53-dependent manner.","evidence":"Co-IP, ubiquitination assay, flow cytometry, sphere formation, xenograft tumors","pmids":["33712005","33689885"],"confidence":"High","gaps":["Whether SOCS6 directly interacts with p53 or is transcriptionally induced was not fully delineated","Applicability to other c-KIT-driven cancers was not tested"]},{"year":2025,"claim":"Recent work expanded SOCS6 substrates and regulatory inputs: SOCS6 was shown to ubiquitinate SLC7A11 (xCT) to drive ferroptosis in ovarian cancer, and FTO-mediated m6A demethylation of SOCS6 mRNA was found to reduce SOCS6 expression, linking epitranscriptomic regulation to inflammatory signaling in keratinocytes.","evidence":"Co-IP and ubiquitination assay for SLC7A11, GSH/ROS/Fe²⁺ measurements, xenograft; Me-RIP, mRNA stability assays, in vivo FTO knockdown for epitranscriptomic regulation","pmids":["41061872","41644088"],"confidence":"Medium","gaps":["The specific SOCS6 SH2-binding phosphotyrosine on SLC7A11 is not identified","Whether FTO-SOCS6 regulation operates beyond keratinocytes is unknown","Independent replication of SLC7A11 as a direct SOCS6 substrate is needed"]},{"year":null,"claim":"Key unresolved questions include the full-length structure of SOCS6 in complex with Elongin BC–Cullin 5, the extent of functional redundancy with SOCS7, the in vivo immunological phenotype of SOCS6 loss in T cells, and how the nuclear, mitochondrial, and cytoplasmic functions of SOCS6 are coordinated.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length SOCS6-Elongin BC-Cullin 5 structure exists","In vivo T cell-specific SOCS6 knockout phenotype not reported","Coordination of subcellular pools of SOCS6 is unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,9,11,14,18]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[9,11,14,18,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2,3,13]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6,14,23]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[10,15]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,3,11,20,22]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,9,7,14,18]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,23]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[8,10,15]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[13]}],"complexes":["Elongin BC–Cullin 5 (CRL5) E3 ligase complex","DRP1–PGAM5 mitochondrial fission complex"],"partners":["KIT","FLT3","LCK","DAB1","DRP1","PGAM5","TCEB1","SLC7A11"],"other_free_text":[]},"mechanistic_narrative":"SOCS6 is an SH2-domain-containing adaptor that recruits the Elongin BC–Cullin 5 E3 ubiquitin ligase complex via its SOCS box to target phosphotyrosine-bearing substrates for ubiquitin-proteasomal degradation, thereby negatively regulating receptor tyrosine kinase signaling, cytokine-JAK-STAT signaling, and T cell activation. Its SH2 domain preferentially recognizes pY+1 Val motifs and binds specific phosphotyrosines on c-KIT (pY568), Flt3 (pY591/pY919), the insulin receptor, p56lck, DAB1, and SLC7A11, promoting their ubiquitination and degradation to attenuate ERK1/2 and STAT3 signaling [PMID:12052866, PMID:21030588, PMID:22952242, PMID:20007709, PMID:41061872]. SOCS6 also localizes to mitochondria where it complexes with DRP1 and PGAM5 to promote mitochondrial fission and intrinsic apoptosis [PMID:22955947]. Combined loss of SOCS6 and SOCS7 in mice causes cortical layer inversion resembling the reeler phenotype, establishing SOCS6 as a required terminator of Reelin–DAB1 signaling during cortical development [PMID:26503265]."},"prefetch_data":{"uniprot":{"accession":"O14544","full_name":"Suppressor of cytokine signaling 6","aliases":["Cytokine-inducible SH2 protein 4","CIS-4","Suppressor of cytokine signaling 4","SOCS-4"],"length_aa":535,"mass_kda":59.5,"function":"SOCS family proteins form part of a classical negative feedback system that regulates cytokine signal transduction. May be a substrate recognition component of a SCF-like ECS (Elongin BC-CUL2/5-SOCS-box protein) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins (By similarity). Regulates KIT degradation by ubiquitination of the tyrosine-phosphorylated receptor","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/O14544/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SOCS6","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SOCS6","total_profiled":1310},"omim":[{"mim_id":"605118","title":"SUPPRESSOR OF CYTOKINE SIGNALING 6; SOCS6","url":"https://www.omim.org/entry/605118"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear speckles","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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hydrophobic residues at pY+2/+3; the SH2 domain interacts with a protein complex consisting of IRS-4, IRS-2, and the p85 regulatory subunit of PI3K. SOCS6-/- mice exhibit ~10% reduced body weight.\",\n      \"method\": \"Biochemical binding assays, phosphopeptide binding specificity, co-immunoprecipitation, knockout mouse generation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical and genetic methods in a single study, foundational paper\",\n      \"pmids\": [\"12052866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"After insulin stimulation, SOCS6 interacts with the monomeric p85 subunit of class-Ia PI3K (but not p85/p110 dimers), and SOCS6 expression is transiently induced by insulin/serum and degraded via the proteasome. SOCS6 transgenic mice show improved glucose metabolism and potentiated Akt/PKB activation, phenocopying p85 knockout mice.\",\n      \"method\": \"Co-immunoprecipitation, proteasome inhibitor treatment, transgenic mouse model, insulin signaling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, transgenic model, multiple functional readouts in one study\",\n      \"pmids\": [\"15123678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The E3 ubiquitin ligase HOIL-1 interacts with SOCS6 (requiring the Ubl domain of HOIL-1 and the SH2 and SOCS-box domains of SOCS6), stabilizes SOCS6 protein, and induces polyubiquitination and degradation of SOCS6-associated proteins.\",\n      \"method\": \"Co-immunoprecipitation, domain-deletion mapping, ubiquitination assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with domain mapping and functional ubiquitination readout, single lab\",\n      \"pmids\": [\"16643902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SOCS6 localizes to both the nucleus and cytoplasm; nuclear localization requires amino acids 1–210 of the N-terminal region. The C-terminal region (SOCS box) is required for SOCS6 to decrease nuclear STAT3 protein levels.\",\n      \"method\": \"GFP-tagged truncation constructs, confocal microscopy, subcellular fractionation, Western blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with domain mapping and functional consequence (STAT3 degradation), single lab\",\n      \"pmids\": [\"17603019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SOCS6 protein stability is increased by PMA treatment via a PKCδ→ERK pathway; this stabilization requires the N-terminal region of SOCS6. Insulin and PDGF also increase endogenous SOCS6 stability with concurrent ERK activation.\",\n      \"method\": \"Pharmacological inhibitors of PKCδ and ERK, Western blot time-course, truncation mutants\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal agents and cell lines, domain mapping, single lab\",\n      \"pmids\": [\"17210122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SOCS6 is a negative regulator of T cell activation: it binds specifically to the active form of p56lck (F505 mimetic), is recruited to the immunological synapse upon TCR stimulation, promotes p56lck ubiquitination and proteasomal degradation, and represses TCR-dependent IL-2 promoter activity.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, confocal microscopy (immunological synapse), ubiquitination assay, luciferase reporter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (Y2H, Co-IP, confocal, ubiquitination, reporter) in a single mechanistic study\",\n      \"pmids\": [\"20007709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The SOCS6 SH2 domain binds c-KIT phosphotyrosine 568 (pY568) with high affinity (Kd = 0.3 µM); the 1.45-Å crystal structure reveals a highly complementary interface with a large BG loop insertion extending binding to pY+6. SOCS6 promotes ubiquitin ligase activity toward c-KIT and regulates c-KIT protein turnover in cells.\",\n      \"method\": \"Crystal structure (1.45 Å), surface plasmon resonance/binding affinity measurement, ubiquitination assay, cell-based c-KIT turnover assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus in vitro ubiquitination and cell-based validation, strong mechanistic evidence\",\n      \"pmids\": [\"21030588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOCS6 promotes mitochondrial fission and intrinsic apoptosis: it localizes to mitochondria, forms a complex with DRP1 and the mitochondrial phosphatase PGAM5, attenuates DRP1 phosphorylation, and promotes DRP1 mitochondrial translocation. Mutation analyses show SOCS6-mediated apoptosis is coupled to its ability to induce mitochondrial fission.\",\n      \"method\": \"Lentiviral knockdown, co-immunoprecipitation (SOCS6/DRP1/PGAM5 complex), phosphorylation assays, mitochondrial fractionation, confocal microscopy, mutation analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — complex reconstitution (Co-IP), mutation analysis, subcellular fractionation, and multiple functional readouts in one study\",\n      \"pmids\": [\"22955947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOCS6 negatively regulates Flt3 signal transduction by directly binding to phosphotyrosines 591 and 919 of Flt3 (identified by phosphopeptide fishing), is tyrosine-phosphorylated upon ligand stimulation, enhances ubiquitination and degradation of Flt3, promotes receptor internalization, and attenuates ERK1/2 (but not Akt) activation. SOCS6 suppresses proliferation driven by oncogenic Flt3 internal tandem duplications.\",\n      \"method\": \"Phosphopeptide fishing, co-immunoprecipitation, ubiquitination assay, receptor internalization/degradation assay, stable Ba/F3 transfection, proliferation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — phosphopeptide site mapping, Co-IP, ubiquitination, and cell-based functional readouts, multiple orthogonal methods\",\n      \"pmids\": [\"22952242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Combined loss of SOCS6 and SOCS7 in mice recapitulates the cortical layer inversion seen in reeler (reelin-null) mice, with dramatic accumulation of the reelin signaling adaptor DAB1 in the cortex. SOCS6 and SOCS7 SH2 domains bind DAB1 ex vivo; mutation of DAB1 diminishes this binding and protects DAB1 from degradation by SOCS6. Phosphorylated DAB1 is elevated in cortical neurons lacking SOCS6/SOCS7, indicating SOCS6 terminates reelin signaling by targeting DAB1 for degradation.\",\n      \"method\": \"Double-knockout mouse (SOCS6/SOCS7), ex vivo SH2 domain binding assay, DAB1 mutagenesis, immunostaining/cortical layer analysis, Western blot\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (double KO phenocopying reeler), ex vivo binding, mutagenesis, and in vivo phospho-DAB1 analysis\",\n      \"pmids\": [\"26503265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SOCS6 is down-regulated in gastric cancer via allelic loss and promoter hypermethylation; ectopic SOCS6 expression suppresses cell growth and colony formation and activates the intrinsic apoptotic pathway with decreased mitochondrial membrane potential.\",\n      \"method\": \"Methylation analysis, allelic loss assay, ectopic overexpression, colony formation, apoptosis assay, mitochondrial membrane potential measurement\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays with clear phenotypic readouts, single lab\",\n      \"pmids\": [\"19646809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Risperidone induces SOCS3 and SOCS6 mRNA expression through cAMP-dependent PKA→ERK activation in neuroblastoma cells; elevated SOCS6 (and SOCS3) subsequently inhibits insulin-induced Akt phosphorylation and leptin-stimulated STAT3 phosphorylation.\",\n      \"method\": \"Pharmacological pathway dissection, RT-PCR, Western blot (p-Akt, p-STAT3), SH-SY5Y cell model\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, pharmacological induction linked to downstream signaling, no direct SOCS6 KO confirmation\",\n      \"pmids\": [\"24626642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The BC-box motif of SOCS6 (SLQYLCRFVI), corresponding to the elongin BC binding site, promotes neuronal differentiation of epidermal stem cells into GABAergic neurons by inducing ubiquitination of JAK2 and inhibiting the JAK2-STAT3 pathway.\",\n      \"method\": \"Intracellular peptide delivery, ubiquitination assay, JAK2-STAT3 pathway inhibition, stem cell differentiation assay, in vivo transplantation\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — peptide domain function linked to ubiquitination and pathway inhibition, single lab\",\n      \"pmids\": [\"32668737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SOCS6 promotes radiosensitivity and reduces cancer stem cell properties in esophageal squamous cell carcinoma by promoting ubiquitylation and degradation of c-Kit; SOCS6 and c-Kit co-localize in the cytoplasm, confirmed by co-immunoprecipitation and immunofluorescence.\",\n      \"method\": \"Coimmunoprecipitation, immunofluorescence/confocal microscopy, ubiquitination assay, colony formation post-radiation, flow cytometry (CSC markers), xenograft model\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP, ubiquitination assay, and in vivo validation; consistent with prior structural data on c-KIT/SOCS6 interaction\",\n      \"pmids\": [\"33712005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SOCS6 deficiency in ESCC cells confers radioresistance by increasing radiation-induced G2/M arrest, enhancing DNA damage repair, and inhibiting radiation-induced apoptosis. Transcriptome sequencing reveals SOCS6 transcription is partially p53-dependent.\",\n      \"method\": \"Knockdown/knockout in vitro and in vivo, transcriptome sequencing, cell cycle analysis, DNA damage repair assays, apoptosis assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined phenotypic readouts and transcriptomic pathway analysis, single lab\",\n      \"pmids\": [\"33689885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SOCS6 promotes mitochondrial fission and cardiomyocyte apoptosis in ischemia/reperfusion injury; miR-19b directly targets the 3'-UTR of SOCS6 mRNA (validated by luciferase assay), and the RNA-binding protein Quaking (QK) regulates miR-19b levels upstream of SOCS6.\",\n      \"method\": \"RNAi knockdown, dual-luciferase reporter assay, H/R cardiomyocyte model, in vivo I/R mouse model, Western blot\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — luciferase validation, in vitro and in vivo functional readouts, consistent with prior SOCS6 mitochondrial fission mechanism\",\n      \"pmids\": [\"35126805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LncRNA CASC2 stabilizes SOCS6 mRNA by recruiting U2AF2 (an RNA-binding protein); exosomal CASC2 from retinal pigment epithelial cells is transferred to macrophages and induces M2 polarization through this SOCS6 mRNA stabilization mechanism.\",\n      \"method\": \"RNA immunoprecipitation (RIP), dual-luciferase reporter assay, exosome isolation/characterization, macrophage polarization assay, in vivo diabetic rat model\",\n      \"journal\": \"Diabetic medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP confirming U2AF2-SOCS6 mRNA interaction, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"40065730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"FTO (N6-methyladenosine demethylase) selectively binds and demethylates m6A modifications within the coding sequence of SOCS6 mRNA, reducing SOCS6 mRNA stability and protein expression in keratinocytes, thereby activating inflammatory programs (IL-1β, S100A8, S100A9) and contributing to atopic dermatitis pathology.\",\n      \"method\": \"Transcriptomic and epitranscriptomic sequencing, MeRIP (m6A mapping), FTO knockdown in vivo (topical), Western blot, inflammatory readouts\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MeRIP site mapping, in vivo topical KD rescue, multiple downstream effectors identified, single lab\",\n      \"pmids\": [\"41644088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SOCS6 promotes ubiquitin-proteasomal degradation of SLC7A11 (a ferroptosis antagonist), reducing intracellular glutathione levels and increasing ROS and Fe2+ accumulation, thereby sensitizing ovarian cancer cells to ferroptosis. SOCS6 also suppresses de novo fatty acid synthesis by downregulating FASN and ACC.\",\n      \"method\": \"SOCS6 overexpression, ubiquitination/co-immunoprecipitation assays, glutathione/ROS/Fe2+ measurement, FASN/ACC Western blot, xenograft model\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ubiquitination assay linking SOCS6 to SLC7A11 degradation with in vivo confirmation, single lab\",\n      \"pmids\": [\"41061872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"miR-494-3p overexpression in primary myelofibrosis hematopoietic stem/progenitor cells promotes megakaryocytopoiesis by directly targeting SOCS6 (validated by luciferase assay); SOCS6 silencing in normal HSPCs mimics this phenotype. SOCS6 suppression is associated with STAT3 activation.\",\n      \"method\": \"miRNA overexpression/inhibition in HSPCs, luciferase reporter assay, Western blot (SOCS6, p-STAT3), gene expression profiling, PMF patient samples\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — luciferase validation, loss-of-function, and patient-derived material, single lab\",\n      \"pmids\": [\"28423484\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SOCS6 is an SH2 domain- and SOCS box-containing E3 ubiquitin ligase that negatively regulates receptor tyrosine kinase signaling (c-KIT, Flt3, p56lck) by binding specific phosphotyrosine motifs on substrates and promoting their ubiquitination and proteasomal degradation; it forms a complex with DRP1 and PGAM5 at mitochondria to promote fission-coupled apoptosis; terminates reelin signaling by targeting DAB1 for degradation; interacts with monomeric p85 to modulate PI3K/Akt signaling downstream of insulin; and its mRNA stability and protein expression are regulated by m6A modification (via FTO), miRNAs, and lncRNA-mediated mRNA stabilization (via U2AF2).\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"SOCS6 binds to elongins B and C through its SOCS box, suggesting it acts as an E3 ubiquitin ligase. The SH2 domains of SOCS6 (and SOCS7) preferentially bind phosphopeptides with valine at pY+1 and hydrophobic residues at pY+2/+3. SOCS6 interacts with a protein complex consisting of IRS-4, IRS-2, and the p85 regulatory subunit of PI3K. SOCS6-knockout mice weigh ~10% less than wild-type littermates.\",\n      \"method\": \"Biochemical binding assays, phosphopeptide binding specificity studies, Co-IP, gene knockout mouse model\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (biochemistry + genetics) in a foundational study\",\n      \"pmids\": [\"12052866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SOCS-1 and SOCS-6 interact with the insulin receptor (IR) in hepatoma cells; SOCS-6 association with the IR requires insulin treatment. Neither protein inhibits IR autophosphorylation, but both inhibit insulin-dependent activation of ERK1/2 and protein kinase B in vivo and IR-directed phosphorylation of IRS-1 in vitro, suggesting a mechanism for cytokine-induced insulin resistance.\",\n      \"method\": \"Co-immunoprecipitation in HepG2/rat hepatoma cells, in vitro IR kinase assay, in vivo signaling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus in vitro kinase assay plus in vivo signaling readouts\",\n      \"pmids\": [\"11342531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SOCS6 binds directly to KIT receptor at phosphotyrosine 567 in the juxtamembrane domain. Ectopic SOCS6 expression decreases SCF-induced cell proliferation and reduces SCF-induced activation of ERK1/2 and p38, but not AKT or STATs, identifying SOCS6 as a selective negative regulator of KIT-MAPK signaling.\",\n      \"method\": \"KIT mutant constructs and synthetic peptides, stable cell line expression, Western blot signaling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding mapped to specific tyrosine with mutagenesis, functional signaling validation\",\n      \"pmids\": [\"14707129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Insulin stimulation induces SOCS-6 expression and interaction of SOCS-6 with the monomeric p85 subunit of class-Ia PI3K (but not p85/p110 dimers). SOCS-6 transgenic mice show improved glucose metabolism and potentiated Akt phosphorylation. SOCS-6 protein is degraded via the proteasome after insulin induction, while SOCS-6-associated p85 is not degraded.\",\n      \"method\": \"SOCS-6 transgenic mice, Co-IP, Western blot, proteasome inhibitor experiments, insulin stimulation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — transgenic mouse model combined with biochemical interaction mapping and proteasome studies\",\n      \"pmids\": [\"15123678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The E3 ubiquitin ligase HOIL-1 interacts with SOCS6 via its Ubl domain binding to the SH2 and SOCS-box domains of SOCS6. HOIL-1 expression stabilizes SOCS6 and induces ubiquitination and degradation of SOCS6-associated proteins, indicating SOCS proteins can interact with E3 ubiquitin ligases beyond the canonical Elongin BC complex.\",\n      \"method\": \"Co-IP, ubiquitination assays, domain mapping with deletion mutants\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP and ubiquitination assays from a single lab\",\n      \"pmids\": [\"16643902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SOCS6 protein stability is increased by PMA treatment through a PKCδ→ERK pathway. The N-terminal region of SOCS6 is required for this stabilization. Insulin and PDGF also increase endogenous SOCS6 stability through ERK activation.\",\n      \"method\": \"Ectopic expression in HEK293T and MCF7 cells, pharmacological inhibitors of PKC and ERK, Western blot stability assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pharmacological pathway dissection, single lab, multiple cell lines\",\n      \"pmids\": [\"17210122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SOCS6 localizes to both nucleus and cytoplasm; nuclear localization is dependent on amino acids 1–210 in the N-terminal region. The C-terminal region of SOCS6 is required for decreasing nuclear Stat3 protein levels, identifying two functionally distinct domains.\",\n      \"method\": \"GFP-tagged truncation constructs, confocal microscopy, subcellular fractionation, Western blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — localization with domain truncations from a single lab\",\n      \"pmids\": [\"17603019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SOCS6 acts as a negative regulator of T cell activation by binding to the kinase domain of active p56lck (identified via yeast two-hybrid). SOCS6 binds specifically to the constitutively active F505 form of p56lck but not wild-type. Upon TCR stimulation, SOCS6 is recruited to the immunological synapse, promotes p56lck ubiquitination and proteasomal degradation, and represses TCR-dependent IL-2 promoter activity.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, confocal microscopy, ubiquitination assay, IL-2 reporter assay in Jurkat T cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Y2H, Co-IP, microscopy, functional reporter), mechanistically rigorous\",\n      \"pmids\": [\"20007709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SOCS6 is down-regulated in gastric cancer via allelic loss and promoter hypermethylation. Ectopic SOCS6 expression suppresses cell growth and colony formation and triggers the intrinsic apoptotic pathway, accompanied by decreased mitochondrial membrane potential.\",\n      \"method\": \"Methylation analysis, ectopic expression, colony formation assay, mitochondrial membrane potential assay, apoptosis assay\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — functional rescue with ectopic expression and mechanistic apoptotic readout, single lab\",\n      \"pmids\": [\"19646809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Crystal structure of the SOCS6 SH2 domain bound to the c-KIT pY568 peptide (residues 564–574) at 1.45 Å resolution reveals a highly complementary interface with high affinity (Kd = 0.3 μM). The SH2 binding pocket extends to pY+6 and a large BG loop insertion contributes significantly to substrate specificity. SOCS6 has E3 ubiquitin ligase activity toward c-KIT and regulates c-KIT protein turnover in cells.\",\n      \"method\": \"X-ray crystallography, surface plasmon resonance (binding affinity), ubiquitination assay, cell-based KIT turnover assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure at high resolution combined with binding affinity measurements and functional ubiquitination assays\",\n      \"pmids\": [\"21030588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOCS6 promotes mitochondrial fission by forming a complex with DRP1 and the mitochondrial phosphatase PGAM5, attenuating DRP1 phosphorylation and promoting DRP1 mitochondrial translocation. SOCS6 targets to mitochondria and induces mitochondrial fragmentation, leading to intrinsic apoptosis (Bax conformational change, mitochondrial targeting, oligomerization). Mutation analysis shows SOCS6-mediated apoptosis is coupled to its ability to induce mitochondrial fission.\",\n      \"method\": \"Lentiviral knockdown, Co-IP, mutagenesis, confocal microscopy, Bax oligomerization assay, DRP1 phosphorylation/localization assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with mutagenesis establishing functional coupling\",\n      \"pmids\": [\"22955947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SOCS6 binds directly to phosphotyrosines 591 and 919 of Flt3 upon ligand stimulation (identified by phosphopeptide fishing). SOCS6 enhances Flt3 ubiquitination, internalization, and degradation, and reduces Erk1/2 (but not Akt) activation. SOCS6 absence promotes cell proliferation induced by oncogenic Flt3-ITD. SOCS6 itself undergoes tyrosine phosphorylation upon Flt3 stimulation.\",\n      \"method\": \"Phosphopeptide fishing, Co-IP, ubiquitination assay, receptor internalization/degradation assay, stable Ba/F3 and UT-7 cell lines, Western blot signaling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — phosphopeptide binding site mapping combined with multiple functional assays in two cell lines\",\n      \"pmids\": [\"22952242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SOCS6 selectively suppresses receptor tyrosine kinase signaling. SOCS6 negatively regulates RTK signaling by promoting ubiquitination-mediated receptor degradation and induces apoptosis by targeting mitochondrial proteins, functioning as an E3 ubiquitin ligase adaptor through its SOCS box with Elongin BC and as an SH2-domain-containing substrate recognition module.\",\n      \"method\": \"Review/synthesis integrating previous Co-IP, ubiquitination, and functional data\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review/synthesis, not primary experimental data\",\n      \"pmids\": [\"25172101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Combined loss of SOCS6 and SOCS7 in mice recapitulates the cortical layer inversion seen in reeler mice (lacking Reelin), with dramatic increase in DAB1 in the cortex. SOCS6 and SOCS7 SH2 domains bind DAB1 ex vivo; DAB1 mutation diminishes binding and protects from SOCS6-mediated degradation. Phosphorylated DAB1 is elevated in SOCS6/7 double-knockout cortical neurons. Thus SOCS6 terminates Reelin signaling by promoting DAB1 degradation.\",\n      \"method\": \"Single and double knockout mice, ex vivo SH2 domain binding assays, DAB1 mutagenesis, immunofluorescence, Western blot\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in vivo with biochemical binding and mutagenesis validation\",\n      \"pmids\": [\"26503265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SOCS6 promotes radiosensitivity in esophageal squamous cell carcinoma (ESCC) by ubiquitinating and degrading c-Kit. SOCS6 and c-Kit colocalize in the cytoplasm. SOCS6 overexpression decreases cancer stem cell populations (CD271+, CD24low/CD44high), and inhibits tumor growth in xenograft models. SOCS6 deficiency increases radioresistance by enhancing G2/M arrest, DNA damage repair, and inhibiting apoptosis; SOCS6 transcription is partially p53-dependent.\",\n      \"method\": \"CoIP, ubiquitination assay, immunofluorescence/confocal microscopy, flow cytometry, sphere formation, xenograft, transcriptome sequencing\",\n      \"journal\": \"Cancer cell international / Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CoIP plus ubiquitination assay plus in vivo xenograft with multiple functional readouts\",\n      \"pmids\": [\"33712005\", \"33689885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SOCS6 promotes mitochondrial fission and cardiomyocyte apoptosis in hypoxia/reoxygenation injury. SOCS6 is a direct target of miR-19b; Quaking (QK) RNA-binding protein regulates miR-19b expression, placing QK upstream of miR-19b/SOCS6 in cardiomyocyte I/R injury. SOCS6 inhibition by RNA interference attenuates H/R-induced mitochondrial fission and apoptosis.\",\n      \"method\": \"Dual-luciferase reporter assay, RNA interference, Western blot, in vivo mouse I/R model, apoptosis assays\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — luciferase validation, KD phenotype, in vivo model; single lab\",\n      \"pmids\": [\"35126805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The BC-box motif of SOCS6 (sequence SLQYLCRFVI, the elongin BC binding site) is sufficient to promote GABAergic neuronal differentiation of epidermal stem cells via ubiquitination of JAK2 and inhibition of the JAK2-STAT3 pathway.\",\n      \"method\": \"Intracellular peptide delivery, Western blot for JAK2 ubiquitination, JAK2/STAT3 pathway readouts, in vivo transplantation in ischemic rat brain\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — peptide-based mechanistic study with functional pathway readout; single lab\",\n      \"pmids\": [\"32668737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The N6-methyladenosine demethylase FTO binds and demethylates m6A modifications within the coding sequence of SOCS6 mRNA, reducing SOCS6 mRNA stability and protein expression. This FTO/SOCS6-m6A axis activates inflammatory programs (IL-1β, S100A8, S100A9) in keratinocytes, linking obesity-associated FTO upregulation to atopic dermatitis pathology.\",\n      \"method\": \"Transcriptomic and epitranscriptomic sequencing, Me-RIP assay, Western blot, RNA stability assays, topical FTO knockdown in vivo\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Me-RIP confirms m6A site, mRNA stability assays validate mechanism; single lab\",\n      \"pmids\": [\"41644088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SOCS6 promotes ubiquitin-proteasomal degradation of SLC7A11 (xCT), reducing intracellular glutathione and augmenting ROS and Fe2+ accumulation to drive ferroptosis in ovarian cancer cells. SOCS6 also suppresses de novo fatty acid synthesis by downregulating FASN and ACC enzymes.\",\n      \"method\": \"Co-IP, ubiquitination assay, GSH/ROS/Fe2+ measurements, lipid synthesis enzyme Western blot, xenograft model\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — CoIP/ubiquitination assay with mechanistic downstream readouts; single lab\",\n      \"pmids\": [\"41061872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LncRNA CASC2 (from retinal pigment epithelial cell exosomes) stabilizes SOCS6 mRNA via recruitment of the RNA-binding protein U2AF2, thereby inhibiting M1 macrophage polarization and promoting M2 polarization. This CASC2/U2AF2/SOCS6 axis attenuates diabetic retinopathy in vitro and in vivo.\",\n      \"method\": \"RNA immunoprecipitation (RIP), dual-luciferase reporter assay, Western blot, flow cytometry for macrophage polarization, in vivo diabetic rat model\",\n      \"journal\": \"Diabetic medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — RIP confirms U2AF2-SOCS6 mRNA interaction; mRNA stability and in vivo validation; single lab\",\n      \"pmids\": [\"40065730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-155 directly targets the SOCS6 3'-UTR, repressing SOCS6 protein and mRNA; sustained miR-155 overexpression activates STAT3 and promotes tamoxifen resistance in breast cancer. Reintroduction of SOCS6 cDNA lacking the 3'-UTR abrogates miR-155-induced cell survival, establishing a miR-155/SOCS6/STAT3 axis.\",\n      \"method\": \"Luciferase reporter assay, Western blot, miRNA mimic/inhibitor transfection, SOCS6 rescue experiment\",\n      \"journal\": \"American journal of translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — luciferase validation plus rescue experiment; single lab\",\n      \"pmids\": [\"26692956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"miR-424-5p directly suppresses SOCS6 expression in pancreatic cancer (confirmed by luciferase reporter assay) and activates the ERK1/2 signaling pathway downstream of SOCS6 suppression.\",\n      \"method\": \"Luciferase reporter assay, qRT-PCR, Western blot, miR-424-5p inhibition and SOCS6 overexpression functional studies\",\n      \"journal\": \"Pathology oncology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — luciferase validation plus signaling pathway readout; single lab\",\n      \"pmids\": [\"23653113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"miR-494-3p overexpression in primary myelofibrosis HSPCs promotes megakaryocytopoiesis by targeting SOCS6 (confirmed by luciferase assay); SOCS6 silencing in normal HSPCs mimics this phenotype and activates STAT3. miR-494-3p inhibition in PMF HSPCs upregulates SOCS6 and impairs aberrant megakaryocyte differentiation.\",\n      \"method\": \"Luciferase reporter assay, Western blot, gene expression profiling, SOCS6 siRNA knockdown, miRNA inhibition in patient-derived HSPCs\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — validated in patient-derived primary cells with multiple methods; single lab\",\n      \"pmids\": [\"28423484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Japanese eel AjSOCS6 (with conserved SH2 and SOCS box domains) localizes to the cytoplasm and negatively regulates both MyD88-dependent NF-κB signaling and the type I IFN signaling pathway. Co-transfection with AjMyD88 reduced NF-κB luciferase activity, and knockdown upregulated immune gene expression in vivo.\",\n      \"method\": \"Subcellular localization (fluorescence), NF-κB luciferase reporter assay, co-transfection with MyD88, siRNA knockdown in vitro and in vivo\",\n      \"journal\": \"Fish & shellfish immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional reporter and knockdown; ortholog study in teleost fish\",\n      \"pmids\": [\"39276815\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SOCS6 is an E3 ubiquitin ligase adaptor protein whose SH2 domain selectively recognizes phosphotyrosine motifs (preferring pY+1 Val) on receptor tyrosine kinases (c-KIT pY568/pY567, Flt3 pY591/pY919, insulin receptor) and cytoplasmic substrates (p56lck, DAB1, SLC7A11), recruiting the Elongin BC–Cullin5 scaffold via its SOCS box to drive ubiquitin-proteasomal degradation of these targets, thereby negatively regulating KIT/Flt3/insulin receptor signaling, MAPK-ERK activation, STAT3 levels, Reelin pathway termination (through DAB1 degradation required for cortical neuron layering), and T cell activation (through lck degradation), while also localizing to mitochondria where it forms a complex with DRP1 and PGAM5 to promote mitochondrial fission and intrinsic apoptosis; protein stability is regulated by the PKCδ–ERK pathway and by m6A demethylation of its mRNA by FTO.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SOCS6 is an SH2-domain and SOCS-box-containing adaptor that functions as a substrate-recognition subunit of an elongin B/C–cullin E3 ubiquitin ligase complex, targeting multiple receptor tyrosine kinases and signaling intermediates for ubiquitin-dependent proteasomal degradation. Its SH2 domain selectively recognizes phosphotyrosine motifs with hydrophobic residues at pY+1/+2/+3 positions, enabling high-affinity binding to activated c-KIT (pY568), Flt3 (pY591/pY919), p56lck, and the reelin adaptor DAB1, thereby terminating RTK, TCR, and reelin signaling [PMID:21030588, PMID:22952242, PMID:20007709, PMID:26503265]. Beyond canonical SOCS-box–mediated ubiquitination, SOCS6 localizes to mitochondria where it forms a complex with DRP1 and PGAM5, attenuates DRP1 phosphorylation, and promotes mitochondrial fission coupled to intrinsic apoptosis [PMID:22955947]. SOCS6 expression is itself regulated post-transcriptionally by m6A modification (demethylated by FTO), microRNAs including miR-19b, and lncRNA CASC2-mediated mRNA stabilization through U2AF2 recruitment [PMID:41644088, PMID:35126805, PMID:40065730].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing SOCS6 as an elongin-binding E3 ubiquitin ligase component with a phosphotyrosine-selective SH2 domain resolved its molecular framework: the SOCS box recruits elongins B/C while the SH2 domain preferentially recognizes hydrophobic residues at pY+1 through pY+3, and its SH2 domain engages IRS-2/IRS-4/p85 complexes, linking SOCS6 to insulin/PI3K signaling.\",\n      \"evidence\": \"Phosphopeptide library screening, co-immunoprecipitation, SOCS6 knockout mice\",\n      \"pmids\": [\"12052866\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural basis for SH2 selectivity yet determined\", \"Mechanism by which SOCS6 loss causes reduced body weight unexplained\", \"Direct ubiquitin ligase activity not reconstituted in vitro\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating that SOCS6 selectively binds monomeric p85 (not p85/p110 dimers) and that transgenic SOCS6 mice phenocopy p85 knockout mice with enhanced Akt activation established SOCS6 as a negative regulator of free p85, which itself inhibits PI3K signaling.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, transgenic mouse insulin signaling assays\",\n      \"pmids\": [\"15123678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SOCS6 ubiquitinates p85 directly or acts as a sequestering factor unclear\", \"Tissue-specific relevance beyond insulin signaling not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Two studies illuminated SOCS6 protein stability control: HOIL-1 interacts with SOCS6 via its Ubl domain and stabilizes SOCS6 while promoting degradation of SOCS6-associated substrates, and separately, PKCδ→ERK signaling stabilizes SOCS6 protein via its N-terminal region, explaining how growth factor stimulation increases SOCS6 levels.\",\n      \"evidence\": \"Co-immunoprecipitation with domain mapping, pharmacological inhibitors of PKCδ/ERK, truncation mutants\",\n      \"pmids\": [\"16643902\", \"17210122\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether HOIL-1 ubiquitinates SOCS6 substrates directly or through the SOCS6 SOCS-box not resolved\", \"Phosphorylation site(s) on SOCS6 mediating ERK-dependent stabilization not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapping SOCS6 subcellular localization showed it resides in both nucleus and cytoplasm, with residues 1–210 required for nuclear entry and the C-terminal SOCS box required for reducing nuclear STAT3, connecting SOCS6 to JAK-STAT pathway termination.\",\n      \"evidence\": \"GFP-tagged truncation constructs, confocal microscopy, subcellular fractionation\",\n      \"pmids\": [\"17603019\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SOCS6 directly ubiquitinates STAT3 or acts indirectly not determined\", \"Nuclear localization signal not precisely defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identifying SOCS6 as a negative regulator of T cell activation through binding active p56lck, promoting its ubiquitination and proteasomal degradation, and suppressing IL-2 transcription extended its substrate repertoire beyond RTKs to non-receptor tyrosine kinases in adaptive immunity.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, confocal imaging at the immunological synapse, ubiquitination assay, luciferase reporter\",\n      \"pmids\": [\"20007709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo T cell phenotype in SOCS6 knockout mice not characterized\", \"Redundancy with other SOCS family members at the immunological synapse not assessed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The 1.45-Å crystal structure of the SOCS6 SH2 domain bound to c-KIT pY568 revealed a uniquely large BG loop insertion that extends substrate contacts to pY+6, explaining high-affinity binding (Kd 0.3 µM) and providing the first structural rationale for SOCS6 substrate selectivity.\",\n      \"evidence\": \"X-ray crystallography, surface plasmon resonance, cell-based c-KIT turnover and ubiquitination assays\",\n      \"pmids\": [\"21030588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length SOCS6 structure including SOCS box and elongin complex\", \"Whether the extended BG loop contact applies to all SOCS6 substrates untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Two parallel studies revealed SOCS6 functions beyond classical SOCS-box signaling: it directly binds Flt3 pY591/pY919 to promote receptor ubiquitination, internalization, and ERK attenuation (suppressing oncogenic Flt3-ITD proliferation), and independently localizes to mitochondria where it forms a DRP1–PGAM5 complex to promote fission-coupled apoptosis.\",\n      \"evidence\": \"Phosphopeptide fishing and Co-IP for Flt3; Co-IP of DRP1/PGAM5/SOCS6 complex, mitochondrial fractionation, mutation analysis for fission\",\n      \"pmids\": [\"22952242\", \"22955947\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SOCS6 is recruited to mitochondria mechanistically undefined\", \"Whether DRP1/PGAM5 interaction requires the SH2 domain or SOCS box not fully resolved\", \"Flt3-ITD therapeutic relevance of SOCS6 restoration not tested in vivo\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genetic loss of both SOCS6 and SOCS7 in mice phenocopied the cortical layer inversion of reeler mice with dramatic DAB1 accumulation, establishing SOCS6 as a physiological terminator of reelin signaling by targeting phospho-DAB1 for degradation—the first demonstration of SOCS6's role in brain development.\",\n      \"evidence\": \"SOCS6/SOCS7 double-knockout mice, ex vivo SH2 domain binding, DAB1 mutagenesis, cortical layer immunostaining\",\n      \"pmids\": [\"26503265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual contributions of SOCS6 vs. SOCS7 to DAB1 degradation not separable\", \"Whether SOCS6 ubiquitinates DAB1 directly or recruits another ligase not shown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"SOCS6 was shown to promote c-KIT ubiquitination and degradation in esophageal squamous cell carcinoma, conferring radiosensitivity and reducing cancer stem cell properties, while separately SOCS6 deficiency was shown to enhance DNA damage repair and confer radioresistance, with SOCS6 transcription being partially p53-dependent.\",\n      \"evidence\": \"Co-IP and ubiquitination assays in ESCC, xenograft models, transcriptome sequencing, DNA damage repair assays\",\n      \"pmids\": [\"33712005\", \"33689885\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct p53 binding to SOCS6 promoter not confirmed by ChIP\", \"Relative contribution of c-KIT degradation vs. other SOCS6 substrates to radiosensitivity unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that miR-19b directly targets SOCS6 3′-UTR (regulated upstream by Quaking) in cardiomyocytes linked post-transcriptional SOCS6 regulation to mitochondrial fission and apoptosis in ischemia/reperfusion injury, extending the DRP1-PGAM5 mechanism to cardiac pathology.\",\n      \"evidence\": \"Dual-luciferase reporter assay, H/R cardiomyocyte model, in vivo I/R mouse model\",\n      \"pmids\": [\"35126805\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether other miRNAs cooperatively regulate SOCS6 in cardiac tissue not explored\", \"Quaking's mechanism of miR-19b regulation not fully defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Two studies expanded SOCS6 substrates and regulatory layers: SOCS6 was shown to ubiquitinate SLC7A11 (cystine/glutamate antiporter) promoting ferroptosis in ovarian cancer, and lncRNA CASC2 was found to stabilize SOCS6 mRNA by recruiting U2AF2, with exosomal transfer driving macrophage M2 polarization.\",\n      \"evidence\": \"Ubiquitination/co-IP of SLC7A11, glutathione/ROS/Fe²⁺ measurements, xenograft; RIP for U2AF2-SOCS6 mRNA interaction, exosome isolation, diabetic rat model\",\n      \"pmids\": [\"41061872\", \"40065730\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SLC7A11 binding site on SOCS6 SH2 domain not mapped\", \"Whether SLC7A11 is phosphotyrosine-dependent substrate unknown\", \"U2AF2 binding site on SOCS6 mRNA not precisely defined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"FTO-mediated m6A demethylation of SOCS6 mRNA coding sequence reduces SOCS6 mRNA stability and protein expression in keratinocytes, activating inflammatory programs—establishing epitranscriptomic regulation as a major control layer for SOCS6 abundance.\",\n      \"evidence\": \"MeRIP m6A mapping, FTO knockdown with topical delivery in vivo, transcriptomic and protein-level validation\",\n      \"pmids\": [\"41644088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the m6A reader stabilizing SOCS6 mRNA not determined\", \"Whether m6A regulation of SOCS6 operates in non-epithelial tissues unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the full-length structure of SOCS6 in complex with elongin B/C and a cullin scaffold; how SOCS6 is recruited to mitochondria; whether all identified substrates (c-KIT, Flt3, p56lck, DAB1, SLC7A11, JAK2) require SH2-phosphotyrosine recognition; and the physiological consequences of SOCS6 loss in specific immune cell compartments in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length SOCS6/elongin/cullin structural model exists\", \"Mitochondrial targeting mechanism unknown\", \"In vivo immune phenotype of SOCS6 single knockout poorly characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 5, 6, 8, 12, 13, 18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 6, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 5, 9, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 13]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [7, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 5, 6, 8, 9, 19]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 5, 6, 8, 12, 13, 18]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [7, 10, 15]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [\n      \"Elongin B/C–SOCS6 E3 ligase complex\",\n      \"DRP1–PGAM5–SOCS6 mitochondrial fission complex\"\n    ],\n    \"partners\": [\n      \"KIT\",\n      \"FLT3\",\n      \"LCK\",\n      \"DAB1\",\n      \"DRP1\",\n      \"PGAM5\",\n      \"HOIL1\",\n      \"SLC7A11\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"SOCS6 is an SH2-domain-containing adaptor that recruits the Elongin BC–Cullin 5 E3 ubiquitin ligase complex via its SOCS box to target phosphotyrosine-bearing substrates for ubiquitin-proteasomal degradation, thereby negatively regulating receptor tyrosine kinase signaling, cytokine-JAK-STAT signaling, and T cell activation. Its SH2 domain preferentially recognizes pY+1 Val motifs and binds specific phosphotyrosines on c-KIT (pY568), Flt3 (pY591/pY919), the insulin receptor, p56lck, DAB1, and SLC7A11, promoting their ubiquitination and degradation to attenuate ERK1/2 and STAT3 signaling [PMID:12052866, PMID:21030588, PMID:22952242, PMID:20007709, PMID:41061872]. SOCS6 also localizes to mitochondria where it complexes with DRP1 and PGAM5 to promote mitochondrial fission and intrinsic apoptosis [PMID:22955947]. Combined loss of SOCS6 and SOCS7 in mice causes cortical layer inversion resembling the reeler phenotype, establishing SOCS6 as a required terminator of Reelin–DAB1 signaling during cortical development [PMID:26503265].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"The first mechanistic link between SOCS6 and insulin signaling was established, showing that SOCS6 binds the insulin receptor after stimulation and inhibits downstream ERK1/2 and PKB activation without blocking receptor autophosphorylation, placing SOCS6 as a post-receptor negative regulator.\",\n      \"evidence\": \"Co-immunoprecipitation in HepG2 and rat hepatoma cells with in vitro kinase and in vivo signaling assays\",\n      \"pmids\": [\"11342531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of SOCS6 recruitment to the IR (specific phosphotyrosine site) was undefined\", \"Ubiquitination of the IR by SOCS6 was not tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Biochemical characterization revealed that SOCS6 binds Elongin BC through its SOCS box (establishing E3 ligase adaptor function) and that its SH2 domain selects phosphopeptides with pY+1 Val, defining the substrate-recognition logic; knockout mice showed a growth defect but no overt metabolic phenotype.\",\n      \"evidence\": \"Phosphopeptide binding specificity assays, Co-IP with Elongins, SOCS6-knockout mouse phenotyping\",\n      \"pmids\": [\"12052866\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No direct ubiquitination substrate was identified\", \"The mild knockout phenotype suggested functional redundancy with SOCS7\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"SOCS6 was mapped to specific RTK substrates: it binds c-KIT at pY567 and selectively suppresses KIT-driven ERK and p38 signaling, while in a parallel study SOCS6 was shown to modulate PI3K signaling by sequestering monomeric p85 and improving glucose metabolism in transgenic mice.\",\n      \"evidence\": \"KIT phosphotyrosine mutagenesis, SOCS6-transgenic mice, Co-IP for p85 interaction, proteasome inhibitor experiments\",\n      \"pmids\": [\"14707129\", \"15123678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SOCS6 directly ubiquitinates KIT was not shown at this stage\", \"The distinct roles of SOCS6 in RTK versus insulin signaling remained unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"SOCS6 protein stability was shown to be positively regulated by a PKCδ–ERK pathway, and an alternative E3 ligase partner (HOIL-1) was found to interact with and stabilize SOCS6, expanding the regulatory network beyond the canonical Elongin BC–Cullin 5 complex.\",\n      \"evidence\": \"Pharmacological inhibitors in HEK293T/MCF7 cells; Co-IP and ubiquitination assays for HOIL-1 interaction\",\n      \"pmids\": [\"17210122\", \"16643902\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological significance of the HOIL-1 interaction was not demonstrated in vivo\", \"Whether PKCδ-ERK stabilization creates a feedback loop on SOCS6 target turnover was not tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Domain-mapping studies revealed that SOCS6 shuttles between the nucleus and cytoplasm, with N-terminal residues 1–210 directing nuclear entry and the C-terminal region required for reducing nuclear STAT3 levels, indicating SOCS6 can regulate transcription factor abundance in the nucleus.\",\n      \"evidence\": \"GFP-truncation constructs, confocal microscopy, subcellular fractionation in transfected cells\",\n      \"pmids\": [\"17603019\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SOCS6 ubiquitinates nuclear STAT3 directly was not tested\", \"Nuclear function of SOCS6 was not validated in primary cells\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"SOCS6 was identified as a negative regulator of T cell activation: it binds constitutively active p56lck, promotes its ubiquitination and proteasomal degradation at the immunological synapse, and suppresses IL-2 promoter activity, establishing SOCS6 as a checkpoint in TCR signaling.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, confocal microscopy, ubiquitination assay, IL-2 luciferase reporter in Jurkat T cells\",\n      \"pmids\": [\"20007709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo T cell phenotype of SOCS6 loss was not examined\", \"Whether SOCS6 targets wild-type lck under physiological TCR stimulation remained unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"A 1.45 Å crystal structure of the SOCS6 SH2 domain bound to c-KIT pY568 peptide revealed the molecular basis for substrate selectivity, including an extended binding groove to pY+6 and a large BG loop insertion, while functional assays confirmed SOCS6 E3 ligase activity toward c-KIT in cells.\",\n      \"evidence\": \"X-ray crystallography, surface plasmon resonance (Kd = 0.3 μM), in-cell ubiquitination and turnover assays\",\n      \"pmids\": [\"21030588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length SOCS6 structure was not determined\", \"The structural basis for the Elongin BC–Cullin 5 interface of SOCS6 remained unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Two major advances broadened SOCS6 biology: (1) SOCS6 was shown to bind Flt3 at pY591/pY919, promoting its ubiquitination, internalization, and degradation to suppress oncogenic Flt3-ITD–driven proliferation; (2) SOCS6 was found to target mitochondria, complex with DRP1 and PGAM5, attenuate DRP1 phosphorylation, and promote mitochondrial fission coupled to intrinsic apoptosis.\",\n      \"evidence\": \"Phosphopeptide fishing and multiple functional assays in Ba/F3 and UT-7 cells (Flt3); Co-IP, mutagenesis, confocal microscopy, Bax oligomerization assays (mitochondrial fission)\",\n      \"pmids\": [\"22952242\", \"22955947\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SOCS6 ubiquitinates DRP1 or PGAM5 was not established\", \"The relative contribution of mitochondrial versus RTK functions to SOCS6-dependent apoptosis was unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genetic evidence in SOCS6/SOCS7 double-knockout mice demonstrated that SOCS6 is essential for terminating Reelin signaling during cortical development by promoting DAB1 degradation; loss of both SOCS proteins phenocopied the reeler cortical inversion.\",\n      \"evidence\": \"Single and double knockout mice, ex vivo SH2-domain binding assays, DAB1 mutagenesis, immunofluorescence\",\n      \"pmids\": [\"26503265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The individual contributions of SOCS6 versus SOCS7 to DAB1 degradation were not fully separable\", \"Downstream transcriptional consequences of sustained DAB1 in cortical neurons were not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"In cancer contexts, SOCS6 was shown to ubiquitinate and degrade c-KIT to promote radiosensitivity in esophageal squamous cell carcinoma, reducing cancer stem cell populations in a partially p53-dependent manner.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, flow cytometry, sphere formation, xenograft tumors\",\n      \"pmids\": [\"33712005\", \"33689885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SOCS6 directly interacts with p53 or is transcriptionally induced was not fully delineated\", \"Applicability to other c-KIT-driven cancers was not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Recent work expanded SOCS6 substrates and regulatory inputs: SOCS6 was shown to ubiquitinate SLC7A11 (xCT) to drive ferroptosis in ovarian cancer, and FTO-mediated m6A demethylation of SOCS6 mRNA was found to reduce SOCS6 expression, linking epitranscriptomic regulation to inflammatory signaling in keratinocytes.\",\n      \"evidence\": \"Co-IP and ubiquitination assay for SLC7A11, GSH/ROS/Fe²⁺ measurements, xenograft; Me-RIP, mRNA stability assays, in vivo FTO knockdown for epitranscriptomic regulation\",\n      \"pmids\": [\"41061872\", \"41644088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The specific SOCS6 SH2-binding phosphotyrosine on SLC7A11 is not identified\", \"Whether FTO-SOCS6 regulation operates beyond keratinocytes is unknown\", \"Independent replication of SLC7A11 as a direct SOCS6 substrate is needed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full-length structure of SOCS6 in complex with Elongin BC–Cullin 5, the extent of functional redundancy with SOCS7, the in vivo immunological phenotype of SOCS6 loss in T cells, and how the nuclear, mitochondrial, and cytoplasmic functions of SOCS6 are coordinated.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length SOCS6-Elongin BC-Cullin 5 structure exists\", \"In vivo T cell-specific SOCS6 knockout phenotype not reported\", \"Coordination of subcellular pools of SOCS6 is unexplored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 9, 11, 14, 18]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [9, 11, 14, 18, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2, 3, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 14, 23]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [10, 15]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 3, 11, 20, 22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 9, 7, 14, 18]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 23]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [8, 10, 15]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"complexes\": [\n      \"Elongin BC–Cullin 5 (CRL5) E3 ligase complex\",\n      \"DRP1–PGAM5 mitochondrial fission complex\"\n    ],\n    \"partners\": [\n      \"KIT\",\n      \"FLT3\",\n      \"LCK\",\n      \"DAB1\",\n      \"DRP1\",\n      \"PGAM5\",\n      \"TCEB1\",\n      \"SLC7A11\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}