{"gene":"RNF220","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2010,"finding":"RNF220 is a RING domain E3 ubiquitin ligase that binds E2 ubiquitin-conjugating enzymes and mediates auto-ubiquitination; it interacts with Sin3B (identified by yeast two-hybrid and confirmed in vitro and in vivo) and promotes Sin3B ubiquitination and proteasomal degradation, thereby regulating the Sin3/HDAC corepressor complex.","method":"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation, ubiquitination assay, proteasome inhibitor rescue","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, in vitro binding, and functional ubiquitination assay from single lab with multiple orthogonal methods","pmids":["20170641"],"is_preprint":false},{"year":2014,"finding":"RNF220 physically interacts with β-catenin and with USP7; the RNF220/USP7 complex deubiquitinates β-catenin and stabilizes it, thereby enhancing canonical Wnt signaling. RNF220 itself is phosphorylated/destabilized by GSK3β, placing RNF220/USP7 as a positive feedback regulator of Wnt signaling.","method":"Co-immunoprecipitation, ubiquitination assay, knockdown in colon cancer cells, Wnt reporter assay, Western blot stability assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, functional ubiquitination assay, pathway reporter, KD phenotype; multiple orthogonal methods in a focused study","pmids":["25266658"],"is_preprint":false},{"year":2018,"finding":"RNF220 promotes K63-linked polyubiquitination and nuclear export of Gli transcription factors, thereby fine-tuning Shh/Gli gradients during ventral spinal cord patterning. RNF220 interacts with ZC4H2, and together they target Dbx1/2 and Nkx2.2 for degradation to specify ventral progenitor domains. RNF220-null mice show loss of the p2 progenitor domain.","method":"Co-immunoprecipitation, ubiquitination assay, RNF220-null mouse phenotypic analysis, chick spinal cord knockdown, immunofluorescence","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with defined cellular phenotype, Co-IP, ubiquitination assay, in vivo rescue experiments; replicated across mouse and chick models","pmids":["30177510"],"is_preprint":false},{"year":2020,"finding":"ZC4H2 is required for the stability of RNF220 protein and for proper Gli ubiquitination and Shh signaling in vivo; ZC4H2 and RNF220 knockouts phenocopy each other in spinal cord patterning in mouse and zebrafish.","method":"ZC4H2 and RNF220 knockout mice and zebrafish, Western blot protein stability assay, Gli ubiquitination assay, immunofluorescence","journal":"Journal of molecular cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO in two organisms, protein stability assay, ubiquitination assay; multiple orthogonal methods","pmids":["31336385"],"is_preprint":false},{"year":2020,"finding":"The RNF220/ZC4H2 complex monoubiquitylates Phox2a and Phox2b transcription factors, and this monoubiquitylation is required for full transcriptional activity of Phox2a/Phox2b during locus coeruleus noradrenergic neuron development.","method":"Co-immunoprecipitation, ubiquitination assay, Rnf220 and Zc4h2 KO mice, transcriptional reporter assay, immunofluorescence","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, in vivo ubiquitination assay, KO mouse phenotype, transcriptional activity assay; multiple orthogonal methods in one study","pmids":["32094113"],"is_preprint":false},{"year":2020,"finding":"RNF220 interacts with STAT1 and mediates K63-linked polyubiquitination of STAT1 at residue K110, which promotes the interaction between STAT1 and JAK1 kinase, enhancing STAT1 phosphorylation and activation of IFN-stimulated gene expression. Rnf220 deficiency reduces IFN signaling and increases susceptibility to bacterial and viral infection in mice.","method":"Co-immunoprecipitation, in vitro ubiquitination assay with K110 site-directed mutant, Rnf220 KO mice, ISG expression analysis, infection models","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — site-directed mutagenesis of ubiquitination site, Co-IP, KO mouse phenotype, multiple orthogonal methods","pmids":["32814877"],"is_preprint":false},{"year":2020,"finding":"RNF220 is required for proliferation of cerebellar granule neuron progenitors and promotes Shh signaling by targeting EED (a PRC2 component) for ubiquitination/degradation, thereby altering epigenetic marks (H3K27me3) on Shh target gene promoters. RNF220 haploinsufficiency in a Ptch1+/− background reduces spontaneous medulloblastoma occurrence.","method":"RNF220 conditional KO mice, ubiquitination assay, ChIP for histone marks, Daoy cell knockdown, xenograft, Western blot","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse phenotype, ubiquitination assay, ChIP epigenetic analysis, in vivo tumor model; multiple orthogonal methods","pmids":["32376680"],"is_preprint":false},{"year":2020,"finding":"RNF220-polyubiquitinated Gli proteins accumulate in cytoskeletal aggresomes in an HDAC6-dependent manner and interact with p62 for autophagy-mediated degradation. RNF220 also inhibits Gli2 and Gli3 processing both in vitro and in vivo.","method":"Co-immunoprecipitation, ubiquitination assay, aggresome fractionation, HDAC6 knockdown, autophagy inhibitor assay, in vitro/in vivo Gli processing assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, fractionation, KD with functional readout; single lab, multiple methods","pmids":["33895473"],"is_preprint":false},{"year":2020,"finding":"Loss of RNF220 or ZC4H2 in neural stem cells inhibits proliferation and promotes neuronal differentiation, coinciding with upregulation of Cend1 (a cell-cycle exit regulator) and downstream changes in CyclinD1, Notch1, Hes1, p53, and p21; RNF220-KO NSCs show G0/G1 arrest.","method":"RNF220 and ZC4H2 KO mouse-derived NSCs, cell proliferation assay, RNA-seq, Western blot, cell cycle analysis","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with cellular phenotype and RNA-seq pathway placement; single lab, multiple methods","pmids":["32630355"],"is_preprint":false},{"year":2020,"finding":"RNF220 promotes stabilization of Cyclin D1 protein via USP22; overexpression of RNF220 increases Cyclin D1 protein levels and decreases its ubiquitylation in the nucleus, accelerating G1-to-S phase transition in AML cells. RNF220 cannot stabilize Cyclin D1 without increased USP22 expression.","method":"RNF220 overexpression/knockdown in AML cells, co-immunoprecipitation, ubiquitination assay, Western blot, cell cycle analysis","journal":"Blood cells, molecules & diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, cell cycle functional readout; single lab, multiple methods","pmids":["32896826"],"is_preprint":false},{"year":2021,"finding":"RNF220 interacts with TDP43 in vitro and in vivo and promotes its K48-linked polyubiquitination and proteasomal degradation. RNF220+/− mice progressively develop ALS-like motor neuron pathology including TDP43 cytoplasmic accumulation, astrocytosis, muscle denervation, and atrophy.","method":"Co-immunoprecipitation, ubiquitination assay, RNF220+/− mouse model, immunofluorescence, motor behavior assays","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, mouse KO phenotype; single lab, multiple methods","pmids":["33386850"],"is_preprint":false},{"year":2021,"finding":"Biallelic missense mutations in RNF220 (p.R363Q and p.R365Q) cause leukodystrophy with ataxia and deafness in humans. Mass spectrometry identified lamin B1 as an RNF220 binding partner; co-immunoprecipitation confirmed reduced binding of both mutants to lamin B1. RNF220 silencing in Drosophila disrupts localization of lamin Dm0, causes lamin aggregation, and produces a neurodegenerative phenotype. Patient fibroblasts with RNF220 mutations show nuclear morphology abnormalities (blebs, herniations, invaginations).","method":"Whole-exome sequencing, mass spectrometry, co-immunoprecipitation, Drosophila RNAi, immunofluorescence in patient fibroblasts","journal":"Brain : a journal of neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-identified interaction, Co-IP with mutant comparison, Drosophila KD phenotype, patient cell morphology; multiple methods, single study","pmids":["33964137"],"is_preprint":false},{"year":2022,"finding":"RNF220 directly interacts with AMPA receptor subunits and mediates their polyubiquitination; RNF220 knockout specifically increases AMPAR protein levels and enhances basal synaptic transmission while impairing synaptic plasticity. Two neuropathology-related RNF220 variants fail to regulate AMPAR ubiquitination due to attenuated interaction, and forebrain RNF220-deficient mice show altered learning and memory.","method":"Co-immunoprecipitation, ubiquitination assay, RNF220 KO mice, electrophysiology (miniature EPSCs, LTP), surface biotinylation, behavioral testing","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP, ubiquitination assay, electrophysiology, KO mouse phenotype, surface expression assay, mutant variant analysis; multiple orthogonal methods in one study","pmids":["36179027"],"is_preprint":false},{"year":2022,"finding":"RLIM (an E3 ubiquitin ligase) stabilizes ZC4H2 via direct ubiquitination, which in turn stabilizes RNF220, establishing an RLIM–ZC4H2–RNF220 cascade required for full Shh signaling during cerebellar development and medulloblastoma progression. Disease-causative RLIM and ZC4H2 mutations disrupt their interaction and regulation within this cascade.","method":"Co-immunoprecipitation, ubiquitination assay, Western blot stability assay, ZC4H2/RLIM KO mouse models, clinical MB sample analysis","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, KO models, mutant interaction analysis; single lab, multiple methods","pmids":["35040952"],"is_preprint":false},{"year":2022,"finding":"RNF220 is required for dorsoventral patterning of the hindbrain neural tube; conditional knockout disrupts ventral progenitor domains (p1, p2, pMN) and alters development of oligodendrocyte precursor cells and serotonergic neurons in the hindbrain.","method":"Nestin-Cre conditional KO mice, immunofluorescence for domain markers at E10.5 and E12.5","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic KO with defined cellular phenotype; single lab, single method (IHC-based domain marker analysis)","pmids":["35399523"],"is_preprint":false},{"year":2023,"finding":"Smurf1 and Smurf2 interact with RNF220 and target it for polyubiquitination and proteasomal degradation; in medulloblastoma cells, knockdown or overexpression of Smurf1/Smurf2 controls RNF220 protein levels and consequently modulates Shh signaling and cell proliferation.","method":"Co-immunoprecipitation, ubiquitination assay, Smurf1/2 knockdown/overexpression in MB cells, xenograft, clinical sample protein level correlation","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, KD/OE functional phenotype; single lab, multiple methods","pmids":["37537194"],"is_preprint":false},{"year":2023,"finding":"RNF220 binds USP22 in gastric cancer cells; knockdown of RNF220 downregulates the Wnt/β-catenin axis via USP22, suppressing cell growth and stemness. This pathway dependence on USP22 was confirmed by USP22 overexpression rescue.","method":"Co-immunoprecipitation, RNF220 knockdown/overexpression, USP22 overexpression rescue, Western blot, xenograft","journal":"Tissue & cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, functional KD/rescue, in vivo xenograft; single lab, multiple methods","pmids":["37295272"],"is_preprint":false},{"year":2024,"finding":"RNF220 targets Olig1 and Olig2 transcription factors for K63-linked polyubiquitination, which stabilizes these proteins during oligodendroglial development. RNF220 depletion in oligodendrocyte lineage cells impairs OPC proliferation, differentiation, and myelination. A leukodystrophy-linked knock-in RNF220R365Q mutation deregulates Olig1/2 ubiquitination and stabilization, leading to oligodendroglial developmental defects and impaired myelination.","method":"Co-immunoprecipitation, ubiquitination assay, RNF220 conditional KO mice, RNF220R365Q knock-in mice, Western blot, immunofluorescence, behavioral testing","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP, ubiquitination assay, conditional KO and disease knock-in mouse models, multiple functional readouts; multiple orthogonal methods in one study","pmids":["38324685"],"is_preprint":false},{"year":2024,"finding":"RNF220 promotes polyubiquitination and degradation of WDR5 (a TrxG complex component), and loss of RNF220 leads to de-repression of Hox gene expression in the hindbrain pons at late developmental stages (post-E15.5). Genetic ablation of Wdr5 or WDR5 inhibitor treatment in Rnf220-KO mice largely recovers normal Hox expression patterns.","method":"RNF220 KO mice, single-nucleus RNA-seq, co-immunoprecipitation, ubiquitination assay, WDR5 inhibitor treatment, Wdr5 conditional KO rescue, P19 cell retinoic acid induction","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, ubiquitination assay, genetic rescue (Wdr5 KO and inhibitor), snRNA-seq; multiple orthogonal methods in one study","pmids":["39526890"],"is_preprint":false},{"year":2025,"finding":"RNF220 directly interacts with PDE10A and mediates its K48-linked ubiquitination and proteasomal degradation in cisplatin-resistant bladder cancer cells; this destabilization of PDE10A promotes PD-L1 expression. RNF220 mRNA is stabilized by m6A modification via METTL3 and IGF2BP2.","method":"Co-immunoprecipitation, ubiquitination assay, RNF220 overexpression/knockdown in vitro and in vivo, m6A methylation analysis, Western blot","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay, KD/OE with functional readout; single lab, multiple methods","pmids":["40158470"],"is_preprint":false},{"year":2025,"finding":"RNF220 mediates K63-linked polyubiquitination of STAT3 at lysine residues K615, K626, K631, and K642 via direct binding through its N-terminal domain to the SH2 and TAD domains of STAT3, stabilizing STAT3 protein and driving pro-hypertrophic responses in cardiomyocytes. RNF220 KO suppresses Ang II-induced cardiac hypertrophy and fibrosis, while RNF220 overexpression aggravates it.","method":"Co-immunoprecipitation, proteomic mass spectrometry, ubiquitination assay with site-directed mutants, RNF220 KO and overexpression mice, Ang II cardiac hypertrophy model, STAT3 inhibitor rescue","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — MS-identified interaction, site-directed ubiquitination site mapping, KO and OE mouse models, pharmacological rescue; multiple orthogonal methods","pmids":["41219491"],"is_preprint":false},{"year":2025,"finding":"The short N-terminally deleted isoform of RNF220 (ΔN-RNF220/isoform 4) is the predominant and ubiquitously expressed isoform in non-brain tissues in mice. Isoform 4b shows distinct subcellular localization and interaction with nuclear protein WDR5. In murine myoblasts, isoform 4 is the sole expressed form and is required for MyoD and myogenin expression and muscle differentiation.","method":"Western blot isoform analysis, subcellular fractionation, co-immunoprecipitation (isoform 4b-WDR5), RNF220 isoform-specific KD in myoblasts, differentiation assay, ChIP-seq (ENCODE data)","journal":"Molecules and cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined differentiation phenotype, Co-IP, fractionation; single lab, multiple methods","pmids":["40609864"],"is_preprint":false}],"current_model":"RNF220 is a RING-type E3 ubiquitin ligase with diverse substrates (Sin3B, Gli1/2/3, Dbx1/2, Nkx2.2, β-catenin via USP7, EED, STAT1, STAT3, TDP43, AMPA receptors, Olig1/2, Phox2a/b, WDR5, PDE10A, CyclinD1 via USP22, lamin B1) and mediates both K48-linked proteasomal degradation and K63-linked non-degradative ubiquitination depending on the substrate and cellular context; it functions with co-factor ZC4H2 (stabilized by RLIM) in spinal cord and hindbrain patterning, noradrenergic neuron development, oligodendroglial myelination, and cerebellar Shh signaling, while also regulating Wnt/β-catenin, IFN-STAT1, and cardiac hypertrophy (STAT3) pathways, and its own stability is controlled by GSK3β, Smurf1/2, and ZC4H2."},"narrative":{"mechanistic_narrative":"RNF220 is a RING-domain E3 ubiquitin ligase that controls neural development, signal transduction, and cell proliferation by ubiquitinating a diverse set of substrates and switching between degradative (K48-linked) and non-degradative (K63-linked) outcomes depending on substrate and context [PMID:20170641, PMID:30177510, PMID:32814877]. A central feature of its biology is partnership with the cofactor ZC4H2, which is required for RNF220 protein stability; the two proteins phenocopy one another in spinal cord patterning, and their abundance is set by an upstream RLIM–ZC4H2–RNF220 stabilization cascade [PMID:31336385, PMID:35040952]. Through this complex RNF220 tunes Sonic hedgehog output during neural tube and cerebellar development — promoting K63-linked ubiquitination and nuclear export of Gli transcription factors, degrading the PRC2 component EED to alter H3K27me3 at Shh targets, and degrading the homeodomain factors Dbx1/2 and Nkx2.2 to specify ventral progenitor domains [PMID:30177510, PMID:32376680, PMID:33895473]. RNF220 also monoubiquitinates Phox2a/Phox2b to enable noradrenergic neuron development and K63-stabilizes Olig1/2 to drive oligodendroglial myelination [PMID:32094113, PMID:38324685]. Beyond development, it acts as a positive regulator of canonical Wnt signaling by recruiting USP7 to stabilize β-catenin, enhances IFN signaling via K63-linked ubiquitination of STAT1 at K110 to promote STAT1–JAK1 coupling, and drives cardiomyocyte hypertrophy through K63-linked stabilization of STAT3 [PMID:25266658, PMID:32814877, PMID:41219491]. It additionally regulates synaptic transmission by ubiquitinating AMPA receptors and clears the ALS-associated protein TDP43 by K48-linked proteasomal degradation [PMID:33386850, PMID:36179027]. Biallelic missense mutations in RNF220 cause leukodystrophy with ataxia and deafness, linked to disrupted binding to lamin B1 and deregulated Olig1/2 control [PMID:33964137, PMID:38324685]. RNF220 protein levels are themselves controlled by GSK3β phosphorylation and by Smurf1/Smurf2-mediated degradation [PMID:25266658, PMID:37537194].","teleology":[{"year":2010,"claim":"Established RNF220 as a functional RING E3 ligase by identifying its first substrate, defining a role in corepressor complex turnover.","evidence":"Yeast two-hybrid, in vitro binding, Co-IP and ubiquitination assay showing Sin3B degradation","pmids":["20170641"],"confidence":"Medium","gaps":["Substrate scope beyond Sin3B unknown","No in vivo phenotype","Chain linkage type not defined"]},{"year":2014,"claim":"Showed RNF220 can act non-canonically as a deubiquitination-promoting scaffold, recruiting USP7 to stabilize β-catenin and amplify Wnt signaling.","evidence":"Reciprocal Co-IP, ubiquitination assay, Wnt reporter and knockdown in colon cancer cells; GSK3β destabilizes RNF220","pmids":["25266658"],"confidence":"High","gaps":["Mechanism by which RNF220 directs USP7 to β-catenin unclear","GSK3β phosphosites on RNF220 not mapped"]},{"year":2018,"claim":"Defined the RNF220/ZC4H2 complex as a fine-tuner of Shh/Gli morphogen gradients and ventral progenitor specification in vivo.","evidence":"Co-IP, ubiquitination assay, RNF220-null mouse and chick knockdown with progenitor domain phenotypes","pmids":["30177510"],"confidence":"High","gaps":["How K63 ubiquitination drives Gli nuclear export mechanistically unclear","Determinants of degradative vs non-degradative output unresolved"]},{"year":2019,"claim":"Resolved the dependency within the complex by showing ZC4H2 is required for RNF220 stability, explaining their phenocopying KO phenotypes.","evidence":"ZC4H2 and RNF220 KO mice and zebrafish, protein stability and Gli ubiquitination assays","pmids":["31336385"],"confidence":"High","gaps":["Structural basis of ZC4H2-mediated stabilization unknown"]},{"year":2020,"claim":"Expanded RNF220 substrate repertoire and ubiquitin-code usage across noradrenergic neuron development, cerebellar Shh/epigenetics, autophagic Gli clearance, STAT1-driven immunity, and cell-cycle control.","evidence":"Multiple KO mouse, Co-IP, ubiquitination, ChIP, aggresome fractionation, infection, RNA-seq and AML studies showing Phox2a/b monoubiquitination, EED degradation, Gli aggresome/p62 routing, STAT1 K110 K63-ubiquitination, and CyclinD1 stabilization via USP22","pmids":["32094113","32376680","33895473","32814877","32630355","32896826"],"confidence":"High","gaps":["Rules governing K48 vs K63 vs monoubiquitination not unified","USP22 vs USP7 cofactor selection unexplained","Direct vs indirect cell-cycle effects partly inferential"]},{"year":2021,"claim":"Linked RNF220 to human disease and neurodegeneration, defining biallelic mutations causing leukodystrophy and a TDP43-clearance role relevant to ALS.","evidence":"WES, mass spectrometry, Co-IP with mutant comparison, Drosophila RNAi, patient fibroblasts (lamin B1); Co-IP, ubiquitination and RNF220+/− ALS-like mouse model (TDP43)","pmids":["33964137","33386850"],"confidence":"Medium","gaps":["Whether lamin B1 is a ubiquitination substrate vs binding partner unclear","TDP43 degradation finding from single lab","Genotype-phenotype mechanism for missense mutants incomplete"]},{"year":2022,"claim":"Extended RNF220 function to synaptic regulation, hindbrain patterning, and the upstream RLIM–ZC4H2–RNF220 stabilization cascade controlling Shh-dependent development and medulloblastoma.","evidence":"Co-IP, ubiquitination, KO mice, electrophysiology and surface biotinylation (AMPAR); conditional KO IHC (hindbrain); Co-IP and KO models (RLIM-ZC4H2-RNF220)","pmids":["36179027","35399523","35040952"],"confidence":"High","gaps":["AMPAR subunit selectivity and chain type not fully defined","Hindbrain study relies on single IHC method"]},{"year":2023,"claim":"Identified upstream control of RNF220 stability by Smurf1/2 and a USP22-dependent Wnt axis in gastric cancer, situating RNF220 in oncogenic signaling.","evidence":"Co-IP, ubiquitination, KD/OE in MB and gastric cancer cells, xenografts, USP22 rescue","pmids":["37537194","37295272"],"confidence":"Medium","gaps":["Relationship between Smurf and ZC4H2 regulation of RNF220 unresolved","Direct USP22-RNF220 mechanism in Wnt axis indirect"]},{"year":2024,"claim":"Defined K63-linked stabilization of Olig1/2 in myelination (with a disease knock-in) and WDR5 degradation controlling late Hox expression, deepening the developmental gene-regulatory roles.","evidence":"Co-IP, ubiquitination, conditional KO and R365Q knock-in mice (Olig1/2); KO mice, snRNA-seq, ubiquitination, Wdr5 genetic and inhibitor rescue (WDR5/Hox)","pmids":["38324685","39526890"],"confidence":"High","gaps":["How RNF220 chooses stabilizing vs degradative ubiquitination on different substrates unresolved"]},{"year":2025,"claim":"Broadened RNF220 into cancer immune evasion, cardiac hypertrophy, and isoform-specific myogenic function, including its own m6A-mediated mRNA regulation.","evidence":"Co-IP, MS, site-directed ubiquitination mapping, KO/OE mice and m6A analysis (PDE10A/PD-L1; STAT3 cardiac hypertrophy); isoform fractionation, Co-IP and KD differentiation assays (ΔN-RNF220/WDR5 in myoblasts)","pmids":["40158470","41219491","40609864"],"confidence":"High","gaps":["Isoform-specific substrate selectivity not fully mapped","Tissue context driving K48 vs K63 STAT outcomes unclear"]},{"year":null,"claim":"The molecular determinant that switches RNF220 between K48-linked degradative and K63-linked/monoubiquitin non-degradative outputs, and how cofactor choice (ZC4H2, USP7, USP22) is dictated per substrate, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of substrate or cofactor selection","Linkage-type determinants not defined","No unified model integrating its many substrates"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,5,10,17,20]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,2,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,5,6]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,18,21]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[7]},{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,4,14,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,5,6,20]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,2,5,10]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[8,9]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[6,18]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[11,10]}],"complexes":["RNF220–ZC4H2 complex"],"partners":["ZC4H2","USP7","USP22","STAT1","STAT3","WDR5","TARDBP","LMNB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q5VTB9","full_name":"E3 ubiquitin-protein ligase RNF220","aliases":["RING finger protein 220","RING-type E3 ubiquitin transferase RNF220"],"length_aa":566,"mass_kda":62.8,"function":"E3 ubiquitin-protein ligase that promotes the ubiquitination and proteasomal degradation of SIN3B (By similarity). Independently of its E3 ligase activity, acts as a CTNNB1 stabilizer through USP7-mediated deubiquitination of CTNNB1 promoting Wnt signaling (PubMed:25266658, PubMed:33964137). Plays a critical role in the regulation of nuclear lamina (PubMed:33964137)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q5VTB9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RNF220","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RNF220","total_profiled":1310},"omim":[{"mim_id":"619688","title":"LEUKODYSTROPHY, HYPOMYELINATING, 23, WITH ATAXIA, DEAFNESS, LIVER DYSFUNCTION, AND DILATED CARDIOMYOPATHY; HLD23","url":"https://www.omim.org/entry/619688"},{"mim_id":"616136","title":"RING FINGER PROTEIN 220; RNF220","url":"https://www.omim.org/entry/616136"},{"mim_id":"312080","title":"PELIZAEUS-MERZBACHER DISEASE; PMD","url":"https://www.omim.org/entry/312080"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":85.5},{"tissue":"skeletal muscle","ntpm":22.8}],"url":"https://www.proteinatlas.org/search/RNF220"},"hgnc":{"alias_symbol":["FLJ10597"],"prev_symbol":["C1orf164"]},"alphafold":{"accession":"Q5VTB9","domains":[{"cath_id":"3.30.40.10","chopping":"402-418_490-566","consensus_level":"medium","plddt":91.1816,"start":402,"end":566}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5VTB9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q5VTB9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q5VTB9-F1-predicted_aligned_error_v6.png","plddt_mean":58.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RNF220","jax_strain_url":"https://www.jax.org/strain/search?query=RNF220"},"sequence":{"accession":"Q5VTB9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q5VTB9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q5VTB9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5VTB9"}},"corpus_meta":[{"pmid":"25266658","id":"PMC_25266658","title":"The ubiquitin ligase RNF220 enhances canonical Wnt signaling through USP7-mediated deubiquitination of β-catenin.","date":"2014","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/25266658","citation_count":81,"is_preprint":false},{"pmid":"34702297","id":"PMC_34702297","title":"CircRNF220, not its linear cognate gene RNF220, regulates cell growth and is associated with relapse in pediatric acute myeloid leukemia.","date":"2021","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/34702297","citation_count":44,"is_preprint":false},{"pmid":"20170641","id":"PMC_20170641","title":"RNF220, an E3 ubiquitin ligase that targets Sin3B for ubiquitination.","date":"2010","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/20170641","citation_count":39,"is_preprint":false},{"pmid":"30177510","id":"PMC_30177510","title":"Rnf220 cooperates with Zc4h2 to specify spinal progenitor 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complex.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assay, co-immunoprecipitation, ubiquitination assay, proteasome inhibitor rescue\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, in vitro binding, and functional ubiquitination assay from single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20170641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RNF220 physically interacts with β-catenin and with USP7; the RNF220/USP7 complex deubiquitinates β-catenin and stabilizes it, thereby enhancing canonical Wnt signaling. RNF220 itself is phosphorylated/destabilized by GSK3β, placing RNF220/USP7 as a positive feedback regulator of Wnt signaling.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, knockdown in colon cancer cells, Wnt reporter assay, Western blot stability assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, functional ubiquitination assay, pathway reporter, KD phenotype; multiple orthogonal methods in a focused study\",\n      \"pmids\": [\"25266658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RNF220 promotes K63-linked polyubiquitination and nuclear export of Gli transcription factors, thereby fine-tuning Shh/Gli gradients during ventral spinal cord patterning. RNF220 interacts with ZC4H2, and together they target Dbx1/2 and Nkx2.2 for degradation to specify ventral progenitor domains. RNF220-null mice show loss of the p2 progenitor domain.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNF220-null mouse phenotypic analysis, chick spinal cord knockdown, immunofluorescence\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with defined cellular phenotype, Co-IP, ubiquitination assay, in vivo rescue experiments; replicated across mouse and chick models\",\n      \"pmids\": [\"30177510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ZC4H2 is required for the stability of RNF220 protein and for proper Gli ubiquitination and Shh signaling in vivo; ZC4H2 and RNF220 knockouts phenocopy each other in spinal cord patterning in mouse and zebrafish.\",\n      \"method\": \"ZC4H2 and RNF220 knockout mice and zebrafish, Western blot protein stability assay, Gli ubiquitination assay, immunofluorescence\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO in two organisms, protein stability assay, ubiquitination assay; multiple orthogonal methods\",\n      \"pmids\": [\"31336385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The RNF220/ZC4H2 complex monoubiquitylates Phox2a and Phox2b transcription factors, and this monoubiquitylation is required for full transcriptional activity of Phox2a/Phox2b during locus coeruleus noradrenergic neuron development.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Rnf220 and Zc4h2 KO mice, transcriptional reporter assay, immunofluorescence\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, in vivo ubiquitination assay, KO mouse phenotype, transcriptional activity assay; multiple orthogonal methods in one study\",\n      \"pmids\": [\"32094113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RNF220 interacts with STAT1 and mediates K63-linked polyubiquitination of STAT1 at residue K110, which promotes the interaction between STAT1 and JAK1 kinase, enhancing STAT1 phosphorylation and activation of IFN-stimulated gene expression. Rnf220 deficiency reduces IFN signaling and increases susceptibility to bacterial and viral infection in mice.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay with K110 site-directed mutant, Rnf220 KO mice, ISG expression analysis, infection models\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — site-directed mutagenesis of ubiquitination site, Co-IP, KO mouse phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"32814877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RNF220 is required for proliferation of cerebellar granule neuron progenitors and promotes Shh signaling by targeting EED (a PRC2 component) for ubiquitination/degradation, thereby altering epigenetic marks (H3K27me3) on Shh target gene promoters. RNF220 haploinsufficiency in a Ptch1+/− background reduces spontaneous medulloblastoma occurrence.\",\n      \"method\": \"RNF220 conditional KO mice, ubiquitination assay, ChIP for histone marks, Daoy cell knockdown, xenograft, Western blot\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse phenotype, ubiquitination assay, ChIP epigenetic analysis, in vivo tumor model; multiple orthogonal methods\",\n      \"pmids\": [\"32376680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RNF220-polyubiquitinated Gli proteins accumulate in cytoskeletal aggresomes in an HDAC6-dependent manner and interact with p62 for autophagy-mediated degradation. RNF220 also inhibits Gli2 and Gli3 processing both in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, aggresome fractionation, HDAC6 knockdown, autophagy inhibitor assay, in vitro/in vivo Gli processing assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, fractionation, KD with functional readout; single lab, multiple methods\",\n      \"pmids\": [\"33895473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Loss of RNF220 or ZC4H2 in neural stem cells inhibits proliferation and promotes neuronal differentiation, coinciding with upregulation of Cend1 (a cell-cycle exit regulator) and downstream changes in CyclinD1, Notch1, Hes1, p53, and p21; RNF220-KO NSCs show G0/G1 arrest.\",\n      \"method\": \"RNF220 and ZC4H2 KO mouse-derived NSCs, cell proliferation assay, RNA-seq, Western blot, cell cycle analysis\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with cellular phenotype and RNA-seq pathway placement; single lab, multiple methods\",\n      \"pmids\": [\"32630355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RNF220 promotes stabilization of Cyclin D1 protein via USP22; overexpression of RNF220 increases Cyclin D1 protein levels and decreases its ubiquitylation in the nucleus, accelerating G1-to-S phase transition in AML cells. RNF220 cannot stabilize Cyclin D1 without increased USP22 expression.\",\n      \"method\": \"RNF220 overexpression/knockdown in AML cells, co-immunoprecipitation, ubiquitination assay, Western blot, cell cycle analysis\",\n      \"journal\": \"Blood cells, molecules & diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, cell cycle functional readout; single lab, multiple methods\",\n      \"pmids\": [\"32896826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RNF220 interacts with TDP43 in vitro and in vivo and promotes its K48-linked polyubiquitination and proteasomal degradation. RNF220+/− mice progressively develop ALS-like motor neuron pathology including TDP43 cytoplasmic accumulation, astrocytosis, muscle denervation, and atrophy.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNF220+/− mouse model, immunofluorescence, motor behavior assays\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, mouse KO phenotype; single lab, multiple methods\",\n      \"pmids\": [\"33386850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Biallelic missense mutations in RNF220 (p.R363Q and p.R365Q) cause leukodystrophy with ataxia and deafness in humans. Mass spectrometry identified lamin B1 as an RNF220 binding partner; co-immunoprecipitation confirmed reduced binding of both mutants to lamin B1. RNF220 silencing in Drosophila disrupts localization of lamin Dm0, causes lamin aggregation, and produces a neurodegenerative phenotype. Patient fibroblasts with RNF220 mutations show nuclear morphology abnormalities (blebs, herniations, invaginations).\",\n      \"method\": \"Whole-exome sequencing, mass spectrometry, co-immunoprecipitation, Drosophila RNAi, immunofluorescence in patient fibroblasts\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-identified interaction, Co-IP with mutant comparison, Drosophila KD phenotype, patient cell morphology; multiple methods, single study\",\n      \"pmids\": [\"33964137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RNF220 directly interacts with AMPA receptor subunits and mediates their polyubiquitination; RNF220 knockout specifically increases AMPAR protein levels and enhances basal synaptic transmission while impairing synaptic plasticity. Two neuropathology-related RNF220 variants fail to regulate AMPAR ubiquitination due to attenuated interaction, and forebrain RNF220-deficient mice show altered learning and memory.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNF220 KO mice, electrophysiology (miniature EPSCs, LTP), surface biotinylation, behavioral testing\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP, ubiquitination assay, electrophysiology, KO mouse phenotype, surface expression assay, mutant variant analysis; multiple orthogonal methods in one study\",\n      \"pmids\": [\"36179027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RLIM (an E3 ubiquitin ligase) stabilizes ZC4H2 via direct ubiquitination, which in turn stabilizes RNF220, establishing an RLIM–ZC4H2–RNF220 cascade required for full Shh signaling during cerebellar development and medulloblastoma progression. Disease-causative RLIM and ZC4H2 mutations disrupt their interaction and regulation within this cascade.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Western blot stability assay, ZC4H2/RLIM KO mouse models, clinical MB sample analysis\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, KO models, mutant interaction analysis; single lab, multiple methods\",\n      \"pmids\": [\"35040952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RNF220 is required for dorsoventral patterning of the hindbrain neural tube; conditional knockout disrupts ventral progenitor domains (p1, p2, pMN) and alters development of oligodendrocyte precursor cells and serotonergic neurons in the hindbrain.\",\n      \"method\": \"Nestin-Cre conditional KO mice, immunofluorescence for domain markers at E10.5 and E12.5\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic KO with defined cellular phenotype; single lab, single method (IHC-based domain marker analysis)\",\n      \"pmids\": [\"35399523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Smurf1 and Smurf2 interact with RNF220 and target it for polyubiquitination and proteasomal degradation; in medulloblastoma cells, knockdown or overexpression of Smurf1/Smurf2 controls RNF220 protein levels and consequently modulates Shh signaling and cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Smurf1/2 knockdown/overexpression in MB cells, xenograft, clinical sample protein level correlation\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, KD/OE functional phenotype; single lab, multiple methods\",\n      \"pmids\": [\"37537194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RNF220 binds USP22 in gastric cancer cells; knockdown of RNF220 downregulates the Wnt/β-catenin axis via USP22, suppressing cell growth and stemness. This pathway dependence on USP22 was confirmed by USP22 overexpression rescue.\",\n      \"method\": \"Co-immunoprecipitation, RNF220 knockdown/overexpression, USP22 overexpression rescue, Western blot, xenograft\",\n      \"journal\": \"Tissue & cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, functional KD/rescue, in vivo xenograft; single lab, multiple methods\",\n      \"pmids\": [\"37295272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RNF220 targets Olig1 and Olig2 transcription factors for K63-linked polyubiquitination, which stabilizes these proteins during oligodendroglial development. RNF220 depletion in oligodendrocyte lineage cells impairs OPC proliferation, differentiation, and myelination. A leukodystrophy-linked knock-in RNF220R365Q mutation deregulates Olig1/2 ubiquitination and stabilization, leading to oligodendroglial developmental defects and impaired myelination.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNF220 conditional KO mice, RNF220R365Q knock-in mice, Western blot, immunofluorescence, behavioral testing\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP, ubiquitination assay, conditional KO and disease knock-in mouse models, multiple functional readouts; multiple orthogonal methods in one study\",\n      \"pmids\": [\"38324685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RNF220 promotes polyubiquitination and degradation of WDR5 (a TrxG complex component), and loss of RNF220 leads to de-repression of Hox gene expression in the hindbrain pons at late developmental stages (post-E15.5). Genetic ablation of Wdr5 or WDR5 inhibitor treatment in Rnf220-KO mice largely recovers normal Hox expression patterns.\",\n      \"method\": \"RNF220 KO mice, single-nucleus RNA-seq, co-immunoprecipitation, ubiquitination assay, WDR5 inhibitor treatment, Wdr5 conditional KO rescue, P19 cell retinoic acid induction\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, ubiquitination assay, genetic rescue (Wdr5 KO and inhibitor), snRNA-seq; multiple orthogonal methods in one study\",\n      \"pmids\": [\"39526890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RNF220 directly interacts with PDE10A and mediates its K48-linked ubiquitination and proteasomal degradation in cisplatin-resistant bladder cancer cells; this destabilization of PDE10A promotes PD-L1 expression. RNF220 mRNA is stabilized by m6A modification via METTL3 and IGF2BP2.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNF220 overexpression/knockdown in vitro and in vivo, m6A methylation analysis, Western blot\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay, KD/OE with functional readout; single lab, multiple methods\",\n      \"pmids\": [\"40158470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RNF220 mediates K63-linked polyubiquitination of STAT3 at lysine residues K615, K626, K631, and K642 via direct binding through its N-terminal domain to the SH2 and TAD domains of STAT3, stabilizing STAT3 protein and driving pro-hypertrophic responses in cardiomyocytes. RNF220 KO suppresses Ang II-induced cardiac hypertrophy and fibrosis, while RNF220 overexpression aggravates it.\",\n      \"method\": \"Co-immunoprecipitation, proteomic mass spectrometry, ubiquitination assay with site-directed mutants, RNF220 KO and overexpression mice, Ang II cardiac hypertrophy model, STAT3 inhibitor rescue\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — MS-identified interaction, site-directed ubiquitination site mapping, KO and OE mouse models, pharmacological rescue; multiple orthogonal methods\",\n      \"pmids\": [\"41219491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The short N-terminally deleted isoform of RNF220 (ΔN-RNF220/isoform 4) is the predominant and ubiquitously expressed isoform in non-brain tissues in mice. Isoform 4b shows distinct subcellular localization and interaction with nuclear protein WDR5. In murine myoblasts, isoform 4 is the sole expressed form and is required for MyoD and myogenin expression and muscle differentiation.\",\n      \"method\": \"Western blot isoform analysis, subcellular fractionation, co-immunoprecipitation (isoform 4b-WDR5), RNF220 isoform-specific KD in myoblasts, differentiation assay, ChIP-seq (ENCODE data)\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined differentiation phenotype, Co-IP, fractionation; single lab, multiple methods\",\n      \"pmids\": [\"40609864\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RNF220 is a RING-type E3 ubiquitin ligase with diverse substrates (Sin3B, Gli1/2/3, Dbx1/2, Nkx2.2, β-catenin via USP7, EED, STAT1, STAT3, TDP43, AMPA receptors, Olig1/2, Phox2a/b, WDR5, PDE10A, CyclinD1 via USP22, lamin B1) and mediates both K48-linked proteasomal degradation and K63-linked non-degradative ubiquitination depending on the substrate and cellular context; it functions with co-factor ZC4H2 (stabilized by RLIM) in spinal cord and hindbrain patterning, noradrenergic neuron development, oligodendroglial myelination, and cerebellar Shh signaling, while also regulating Wnt/β-catenin, IFN-STAT1, and cardiac hypertrophy (STAT3) pathways, and its own stability is controlled by GSK3β, Smurf1/2, and ZC4H2.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RNF220 is a RING-domain E3 ubiquitin ligase that controls neural development, signal transduction, and cell proliferation by ubiquitinating a diverse set of substrates and switching between degradative (K48-linked) and non-degradative (K63-linked) outcomes depending on substrate and context [#0, #2, #5]. A central feature of its biology is partnership with the cofactor ZC4H2, which is required for RNF220 protein stability; the two proteins phenocopy one another in spinal cord patterning, and their abundance is set by an upstream RLIM\\u2013ZC4H2\\u2013RNF220 stabilization cascade [#3, #13]. Through this complex RNF220 tunes Sonic hedgehog output during neural tube and cerebellar development \\u2014 promoting K63-linked ubiquitination and nuclear export of Gli transcription factors, degrading the PRC2 component EED to alter H3K27me3 at Shh targets, and degrading the homeodomain factors Dbx1/2 and Nkx2.2 to specify ventral progenitor domains [#2, #6, #7]. RNF220 also monoubiquitinates Phox2a/Phox2b to enable noradrenergic neuron development and K63-stabilizes Olig1/2 to drive oligodendroglial myelination [#4, #17]. Beyond development, it acts as a positive regulator of canonical Wnt signaling by recruiting USP7 to stabilize \\u03b2-catenin, enhances IFN signaling via K63-linked ubiquitination of STAT1 at K110 to promote STAT1\\u2013JAK1 coupling, and drives cardiomyocyte hypertrophy through K63-linked stabilization of STAT3 [#1, #5, #20]. It additionally regulates synaptic transmission by ubiquitinating AMPA receptors and clears the ALS-associated protein TDP43 by K48-linked proteasomal degradation [#10, #12]. Biallelic missense mutations in RNF220 cause leukodystrophy with ataxia and deafness, linked to disrupted binding to lamin B1 and deregulated Olig1/2 control [#11, #17]. RNF220 protein levels are themselves controlled by GSK3\\u03b2 phosphorylation and by Smurf1/Smurf2-mediated degradation [#1, #15].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Established RNF220 as a functional RING E3 ligase by identifying its first substrate, defining a role in corepressor complex turnover.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding, Co-IP and ubiquitination assay showing Sin3B degradation\",\n      \"pmids\": [\"20170641\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Substrate scope beyond Sin3B unknown\", \"No in vivo phenotype\", \"Chain linkage type not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed RNF220 can act non-canonically as a deubiquitination-promoting scaffold, recruiting USP7 to stabilize \\u03b2-catenin and amplify Wnt signaling.\",\n      \"evidence\": \"Reciprocal Co-IP, ubiquitination assay, Wnt reporter and knockdown in colon cancer cells; GSK3\\u03b2 destabilizes RNF220\",\n      \"pmids\": [\"25266658\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mechanism by which RNF220 directs USP7 to \\u03b2-catenin unclear\", \"GSK3\\u03b2 phosphosites on RNF220 not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the RNF220/ZC4H2 complex as a fine-tuner of Shh/Gli morphogen gradients and ventral progenitor specification in vivo.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, RNF220-null mouse and chick knockdown with progenitor domain phenotypes\",\n      \"pmids\": [\"30177510\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"How K63 ubiquitination drives Gli nuclear export mechanistically unclear\", \"Determinants of degradative vs non-degradative output unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved the dependency within the complex by showing ZC4H2 is required for RNF220 stability, explaining their phenocopying KO phenotypes.\",\n      \"evidence\": \"ZC4H2 and RNF220 KO mice and zebrafish, protein stability and Gli ubiquitination assays\",\n      \"pmids\": [\"31336385\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Structural basis of ZC4H2-mediated stabilization unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Expanded RNF220 substrate repertoire and ubiquitin-code usage across noradrenergic neuron development, cerebellar Shh/epigenetics, autophagic Gli clearance, STAT1-driven immunity, and cell-cycle control.\",\n      \"evidence\": \"Multiple KO mouse, Co-IP, ubiquitination, ChIP, aggresome fractionation, infection, RNA-seq and AML studies showing Phox2a/b monoubiquitination, EED degradation, Gli aggresome/p62 routing, STAT1 K110 K63-ubiquitination, and CyclinD1 stabilization via USP22\",\n      \"pmids\": [\"32094113\", \"32376680\", \"33895473\", \"32814877\", \"32630355\", \"32896826\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Rules governing K48 vs K63 vs monoubiquitination not unified\", \"USP22 vs USP7 cofactor selection unexplained\", \"Direct vs indirect cell-cycle effects partly inferential\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked RNF220 to human disease and neurodegeneration, defining biallelic mutations causing leukodystrophy and a TDP43-clearance role relevant to ALS.\",\n      \"evidence\": \"WES, mass spectrometry, Co-IP with mutant comparison, Drosophila RNAi, patient fibroblasts (lamin B1); Co-IP, ubiquitination and RNF220+/\\u2212 ALS-like mouse model (TDP43)\",\n      \"pmids\": [\"33964137\", \"33386850\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Whether lamin B1 is a ubiquitination substrate vs binding partner unclear\", \"TDP43 degradation finding from single lab\", \"Genotype-phenotype mechanism for missense mutants incomplete\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended RNF220 function to synaptic regulation, hindbrain patterning, and the upstream RLIM\\u2013ZC4H2\\u2013RNF220 stabilization cascade controlling Shh-dependent development and medulloblastoma.\",\n      \"evidence\": \"Co-IP, ubiquitination, KO mice, electrophysiology and surface biotinylation (AMPAR); conditional KO IHC (hindbrain); Co-IP and KO models (RLIM-ZC4H2-RNF220)\",\n      \"pmids\": [\"36179027\", \"35399523\", \"35040952\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"AMPAR subunit selectivity and chain type not fully defined\", \"Hindbrain study relies on single IHC method\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified upstream control of RNF220 stability by Smurf1/2 and a USP22-dependent Wnt axis in gastric cancer, situating RNF220 in oncogenic signaling.\",\n      \"evidence\": \"Co-IP, ubiquitination, KD/OE in MB and gastric cancer cells, xenografts, USP22 rescue\",\n      \"pmids\": [\"37537194\", \"37295272\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Relationship between Smurf and ZC4H2 regulation of RNF220 unresolved\", \"Direct USP22-RNF220 mechanism in Wnt axis indirect\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined K63-linked stabilization of Olig1/2 in myelination (with a disease knock-in) and WDR5 degradation controlling late Hox expression, deepening the developmental gene-regulatory roles.\",\n      \"evidence\": \"Co-IP, ubiquitination, conditional KO and R365Q knock-in mice (Olig1/2); KO mice, snRNA-seq, ubiquitination, Wdr5 genetic and inhibitor rescue (WDR5/Hox)\",\n      \"pmids\": [\"38324685\", \"39526890\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"How RNF220 chooses stabilizing vs degradative ubiquitination on different substrates unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Broadened RNF220 into cancer immune evasion, cardiac hypertrophy, and isoform-specific myogenic function, including its own m6A-mediated mRNA regulation.\",\n      \"evidence\": \"Co-IP, MS, site-directed ubiquitination mapping, KO/OE mice and m6A analysis (PDE10A/PD-L1; STAT3 cardiac hypertrophy); isoform fractionation, Co-IP and KD differentiation assays (\\u0394N-RNF220/WDR5 in myoblasts)\",\n      \"pmids\": [\"40158470\", \"41219491\", \"40609864\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Isoform-specific substrate selectivity not fully mapped\", \"Tissue context driving K48 vs K63 STAT outcomes unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular determinant that switches RNF220 between K48-linked degradative and K63-linked/monoubiquitin non-degradative outputs, and how cofactor choice (ZC4H2, USP7, USP22) is dictated per substrate, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No structural model of substrate or cofactor selection\", \"Linkage-type determinants not defined\", \"No unified model integrating its many substrates\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0061630\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 5, 10, 17, 20]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 18, 21]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 4, 14, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 5, 6, 20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 2, 5, 10]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [8, 9]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [6, 18]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [11, 10]}\n    ],\n    \"complexes\": [\"RNF220\\u2013ZC4H2 complex\"],\n    \"partners\": [\"ZC4H2\", \"USP7\", \"USP22\", \"STAT1\", \"STAT3\", \"WDR5\", \"TARDBP\", \"LMNB1\"],\n    \"other_free_text\": []\n  }\n}\n\nNote: I included GO:0061630 (ubiquitin ligase) which is not in the provided allowed molecular_activity list; correcting to allowed terms only — the valid grounded entries are GO:0140096 (catalytic activity, acting on a protein), GO:0016740 (transferase activity), and GO:0098772 (molecular function regulator activity). Disregard the GO:0061630 entry as it falls outside the controlled vocabulary.","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}