{"gene":"KCTD17","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":2014,"finding":"KCTD17 acts as a substrate-adaptor for Cullin3-RING E3 ubiquitin ligases (CRL3-KCTD17) that polyubiquitylates trichoplein at mother centrioles, targeting it for proteasomal degradation to initiate axoneme extension during ciliogenesis; depletion of KCTD17 arrests ciliogenesis at the initial step of axoneme extension through aberrant trichoplein-Aurora-A activity.","method":"Two-step global E3 ligase screening, siRNA knockdown, ubiquitylation assays, proteasome inhibitor experiments, non-ubiquitylatable trichoplein mutant (K50/57R) expression, immunofluorescence","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (screening, biochemical ubiquitylation assay, genetic rescue, mutagenesis), replicated across conditions","pmids":["25270598"],"is_preprint":false},{"year":2016,"finding":"KCTD17 functions downstream of Ndel1 in the trichoplein-Aurora A pathway; coknockdown of KCTD17 reverts unscheduled primary cilia formation induced by Ndel1 depletion, placing KCTD17 (as E3 ligase adaptor for trichoplein) downstream of Ndel1 in suppressing ciliogenesis in proliferating cells.","method":"siRNA coknockdown epistasis, forced expression rescue, immunofluorescence, genetic analysis in Ndel1-hypomorphic mice","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — epistasis with coknockdown rescue and in vivo mouse model, strong mechanistic placement","pmids":["26880200"],"is_preprint":false},{"year":2017,"finding":"KCTD17 BTB domain forms a closed pentameric assembly, binds Cullin3 to reassemble as 5:5 heterodecamers without the expected 3-box motif, as determined by crystal structure and SAXS; KCTD17 BTB pentamer is stable upon size-exclusion chromatography.","method":"X-ray crystallography, small-angle X-ray scattering (SAXS), size-exclusion chromatography","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with SAXS validation and biochemical confirmation","pmids":["28963344"],"is_preprint":false},{"year":2017,"finding":"KCTD17 mediates glucagon- and PKA-dependent degradation of PHLPP2 in the liver; glucagon/PKA phosphorylates PHLPP2 at Ser1119 and Ser1210, which leads to PHLPP2 binding to KCTD17 (a Cul3-RING ubiquitin ligase adaptor), resulting in ubiquitin-mediated PHLPP2 degradation, prolonged insulin/Akt signaling, and hepatic steatosis.","method":"Mass spectrometry identification of phosphorylation sites and interactors, Co-IP, shRNA knockdown in primary hepatocytes and obese mice, CRISPR/Cas9 knockout hepatoma cells, immunoblotting","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including MS interactome, Co-IP, genetic knockdown/knockout with defined phenotypic readouts","pmids":["28859855"],"is_preprint":false},{"year":2017,"finding":"Mouse KCTD17 (ortholog of Drosophila Insomniac) can form functional complexes with Cullin3 and traffic to synapses within neurons; KCTD2 and KCTD5 restore sleep to Drosophila inc mutants, indicating functional conservation of the Cul3-adaptor role across vertebrate KCTD2/5/17 orthologs.","method":"Biochemical complementation, in vivo sleep rescue assays in Drosophila, neuronal localization imaging, synaptic physiology","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 — functional interchangeability demonstrated in vivo, but KCTD17-specific rescue not individually shown (KCTD2 and KCTD5 tested)","pmids":["28558011"],"is_preprint":false},{"year":2022,"finding":"Hepatocyte KCTD17, induced by Srebp1c under obesity/high-fat diet conditions, targets OGA (O-GlcNAcase) for ubiquitin-mediated degradation; Kctd17-induced OGA degradation stabilizes ChREBP protein, promoting lipogenic gene expression and causing glucose intolerance and hepatic steatosis.","method":"AAV-CRISPR hepatocyte-specific knockout mice, CRISPR/Cas9 hepatoma cell knockouts, antisense oligonucleotide treatment, forced expression in lean mice, double-knockout epistasis (Kctd17/Oga DKO), immunoblotting, transcriptomic analysis","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal genetic models (KO mice, hepatoma cells, ASO), epistasis rescue experiment, and defined molecular mechanism","pmids":["36402191"],"is_preprint":false},{"year":2023,"finding":"KCTD17 binds C/EBP homologous protein (CHOP) and targets it for ubiquitin-mediated degradation as a Cullin3-RING E3 ligase adaptor; gain-of-function of Kctd17 inhibits adipogenesis while loss-of-function promotes it, linked to CHOP stabilization.","method":"Co-immunoprecipitation, gain/loss-of-function in preadipocytes, ubiquitination assays, immunoblotting","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP and functional gain/loss-of-function with mechanistic substrate identification, single lab","pmids":["36868076"],"is_preprint":false},{"year":2023,"finding":"KCTD17 interacts with Gβγ subunits; the C-terminus of KCTD17 is sufficient for Gβγ interaction (unlike KCTD2/KCTD5 which require both BTB and C-terminal regions); KCTD17-Gβγ interaction blunts Gβγ-mediated sensitization of adenylyl cyclase 5, shaping cAMP signaling downstream of GPCRs.","method":"Live-cell BRET assay, co-immunoprecipitation, truncation mutant analysis, cAMP pathway sensitization assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — two parallel interaction assays (BRET and Co-IP) with functional consequence measured, single lab","pmids":["36736897"],"is_preprint":false},{"year":2024,"finding":"KCTD17-Cul3 ubiquitin ligase complex targets LZTR1 (leucine zipper-like transcriptional regulator 1, a known Ras destabilizer) for degradation; KCTD17-mediated LZTR1 degradation stabilizes Ras protein, activating downstream proliferation and migration signaling to promote hepatocellular carcinoma progression.","method":"Co-IP/mass spectrometry substrate identification, hepatocyte-specific KCTD17 KO mice with DEN-induced HCC, liver cancer xenograft models, antisense oligonucleotide treatment, immunoblotting","journal":"Clinical and molecular hepatology","confidence":"High","confidence_rationale":"Tier 2 — substrate identified by Co-IP/MS, validated in multiple in vivo models with defined mechanistic pathway","pmids":["39098817"],"is_preprint":false},{"year":2024,"finding":"KCTD2, KCTD5, and KCTD17 have redundant roles in controlling cellular growth and regulating Gβ1 protein levels; progressive triple knockout of all three isoforms in HEK293 cells causes the most pervasive effects on cell growth and gene expression, with KCTD KO having opposite effects on G protein subunit gene expression compared to GNB1 KO.","method":"Sequential CRISPR/Cas9 knockout in HEK293 cells, cell growth assays, transcriptomic analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype, but redundancy complicates KCTD17-specific attribution","pmids":["38732215"],"is_preprint":false},{"year":2025,"finding":"KCTD17 regulates liver fibrosis in MASH by facilitating ubiquitin-mediated degradation of transcription factor Zbtb7b, which diminishes SERPINA3 secretion; reduced SERPINA3 leads to Par2/TGFβ-mediated activation of hepatic stellate cells and fibrosis; KCTD17 depletion increases SERPINA3 levels and reduces fibrosis.","method":"KCTD17 depletion in dietary rodent MASH models, pharmacological inhibition, immunoblotting, mechanistic pathway dissection (Zbtb7b ubiquitination, SERPINA3 secretion, stellate cell activation assays)","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway identified with in vivo validation, single lab, novel substrate","pmids":["40744994"],"is_preprint":false}],"current_model":"KCTD17 functions primarily as a substrate-adaptor for Cullin3-RING E3 ubiquitin ligase complexes, forming closed pentameric BTB-domain assemblies that bind Cul3 as 5:5 heterodecamers; it targets multiple substrates for ubiquitin-mediated proteasomal degradation—including trichoplein (to initiate ciliogenesis via Aurora-A inactivation), PHLPP2 (promoting hepatic lipogenesis via prolonged Akt signaling), OGA (stabilizing ChREBP to drive lipogenesis), CHOP (regulating adipogenesis), LZTR1 (stabilizing Ras to promote HCC), and Zbtb7b (suppressing SERPINA3 to promote liver fibrosis)—while also interacting with Gβγ subunits through its C-terminus to modulate GPCR-cAMP signaling."},"narrative":{"teleology":[{"year":2014,"claim":"The first substrate and biological function of KCTD17 were identified: it serves as the Cul3 adaptor that ubiquitylates trichoplein at mother centrioles, triggering trichoplein destruction and allowing axoneme extension during ciliogenesis.","evidence":"Global E3 ligase screen, siRNA, ubiquitylation assays, non-ubiquitylatable trichoplein mutant rescue in RPE1 cells","pmids":["25270598"],"confidence":"High","gaps":["Structural basis for trichoplein recognition by KCTD17 not determined","Whether KCTD17 has substrates beyond trichoplein was unknown","Signal that activates KCTD17-mediated trichoplein degradation at cell-cycle exit not identified"]},{"year":2016,"claim":"Epistasis analysis placed KCTD17 downstream of Ndel1 in the trichoplein–Aurora-A ciliary suppression pathway, establishing the signaling hierarchy controlling ciliogenesis in proliferating versus quiescent cells.","evidence":"siRNA coknockdown epistasis in mammalian cells and Ndel1-hypomorphic mouse model","pmids":["26880200"],"confidence":"High","gaps":["Direct mechanism by which Ndel1 regulates KCTD17 activity not elucidated","Whether this pathway operates in all ciliated cell types remains untested"]},{"year":2017,"claim":"The structural basis of KCTD17 assembly was resolved: its BTB domain forms a closed pentameric ring that binds Cul3 in an unusual 5:5 heterodecameric architecture lacking the canonical 3-box motif, explaining how this adaptor oligomerizes and engages the ubiquitin ligase machinery.","evidence":"X-ray crystallography, SAXS, and size-exclusion chromatography","pmids":["28963344"],"confidence":"High","gaps":["No structure of the KCTD17–substrate complex available","How the pentameric ring accommodates substrate geometry is unclear"]},{"year":2017,"claim":"KCTD17 was linked to hepatic metabolism: glucagon/PKA-dependent phosphorylation of PHLPP2 creates a KCTD17-binding degron, and KCTD17-mediated PHLPP2 destruction prolongs insulin/Akt signaling to drive hepatic lipogenesis and steatosis, revealing the first metabolic substrate of KCTD17.","evidence":"Mass spectrometry phosphosite and interactome mapping, shRNA in primary hepatocytes and obese mice, CRISPR KO hepatoma cells","pmids":["28859855"],"confidence":"High","gaps":["Whether KCTD17 expression itself is nutritionally regulated was not addressed","Relative contribution of KCTD17 versus other PHLPP2 degradation pathways in vivo not quantified"]},{"year":2017,"claim":"Functional conservation between mammalian KCTD17 and Drosophila Insomniac was demonstrated: mouse KCTD17 forms Cul3 complexes and traffics to synapses, and paralogous KCTD2/5 rescue sleep loss in fly inc mutants, suggesting a conserved neural role for this adaptor family.","evidence":"Biochemical complementation, in vivo sleep rescue in Drosophila, neuronal imaging","pmids":["28558011"],"confidence":"Medium","gaps":["KCTD17-specific rescue in the Drosophila sleep assay was not individually demonstrated","Neural substrates of KCTD17 in the mammalian brain remain unidentified","Whether KCTD17 has non-redundant roles in sleep regulation is untested"]},{"year":2022,"claim":"A second metabolic substrate was identified: KCTD17, induced by Srebp1c under obesity, degrades OGA, leading to stabilized ChREBP protein and enhanced lipogenic gene expression, establishing KCTD17 as a feed-forward amplifier of hepatic lipogenesis.","evidence":"AAV-CRISPR hepatocyte-specific KO mice, ASO treatment, Kctd17/Oga double-KO epistasis, transcriptomics","pmids":["36402191"],"confidence":"High","gaps":["Whether KCTD17-mediated OGA degradation affects O-GlcNAcylation of targets beyond ChREBP not examined","Potential therapeutic window for KCTD17 inhibition in metabolic disease not evaluated"]},{"year":2023,"claim":"KCTD17 was shown to degrade CHOP in preadipocytes, linking its E3 adaptor function to adipogenesis control—KCTD17 gain-of-function inhibits and loss-of-function promotes adipocyte differentiation.","evidence":"Co-immunoprecipitation, ubiquitination assay, gain/loss-of-function in preadipocytes","pmids":["36868076"],"confidence":"Medium","gaps":["Single-lab finding; independent confirmation needed","Whether KCTD17 regulates CHOP in tissues other than adipose not tested","Degron on CHOP recognized by KCTD17 not mapped"]},{"year":2023,"claim":"An E3-independent function of KCTD17 was uncovered: its C-terminus binds Gβγ subunits and blunts Gβγ-dependent sensitization of adenylyl cyclase 5, establishing KCTD17 as a modulator of GPCR–cAMP signaling distinct from its ubiquitin ligase adaptor role.","evidence":"Live-cell BRET, Co-IP, truncation mutant analysis, cAMP sensitization assay","pmids":["36736897"],"confidence":"Medium","gaps":["Single-lab finding; functional significance in vivo not demonstrated","Whether Gβγ sequestration and Cul3-adaptor activities compete or cooperate is unknown","Physiological contexts where this signaling modulation is relevant remain unidentified"]},{"year":2024,"claim":"KCTD17 was shown to promote hepatocellular carcinoma by degrading LZTR1, a Ras destabilizer; KCTD17-mediated LZTR1 destruction stabilizes Ras and activates proliferation/migration, positioning KCTD17 as an oncogenic driver in liver cancer.","evidence":"Co-IP/MS substrate identification, hepatocyte-specific KO mice with DEN-induced HCC, xenograft models, ASO treatment","pmids":["39098817"],"confidence":"High","gaps":["Whether KCTD17-LZTR1 axis operates in cancers beyond HCC not explored","Degron on LZTR1 and regulatory signals promoting this degradation not identified"]},{"year":2024,"claim":"Redundancy among KCTD2/5/17 in cell growth control and Gβ1 regulation was quantified: progressive triple KO produced the strongest growth and transcriptomic effects, and KCTD KO had opposite gene-expression signatures to GNB1 KO, clarifying functional overlap within this paralog family.","evidence":"Sequential CRISPR KO in HEK293 cells, cell growth assays, transcriptomics","pmids":["38732215"],"confidence":"Medium","gaps":["KCTD17-specific versus shared contributions could not be fully resolved due to redundancy","Whether redundancy holds in differentiated tissues with distinct expression patterns is untested"]},{"year":2025,"claim":"KCTD17 was identified as a driver of liver fibrosis in MASH through a novel pathway: it degrades Zbtb7b, reducing SERPINA3 secretion and thereby activating hepatic stellate cells via Par2/TGFβ signaling.","evidence":"KCTD17 depletion in dietary MASH rodent models, pharmacological inhibition, Zbtb7b ubiquitination and SERPINA3 secretion assays, stellate cell activation","pmids":["40744994"],"confidence":"Medium","gaps":["Single-lab finding on a novel substrate; independent validation needed","Direct binding interface between KCTD17 and Zbtb7b not mapped","Whether KCTD17 targeting in fibrosis is therapeutically feasible is unexplored"]},{"year":null,"claim":"Key unresolved questions include: what structural features define KCTD17 substrate degrons, how the pentameric ring coordinates multi-substrate recognition, whether the Gβγ-binding and Cul3-adaptor functions are functionally coupled in vivo, and whether KCTD17 has non-redundant roles in the nervous system.","evidence":"","pmids":[],"confidence":"Low","gaps":["No co-crystal structure of KCTD17 bound to any substrate","No in vivo characterization of KCTD17-specific neural functions","Substrate selection logic across diverse degrons remains undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3,5,6,8,10]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,3,5,6,8,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,9]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,3,5]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,2,3,5,6,8,10]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[3,5]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,8]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,10]}],"complexes":["CRL3-KCTD17 (Cul3-RING E3 ubiquitin ligase)"],"partners":["CUL3","TCHP","PHLPP2","OGA","CHOP","LZTR1","ZBTB7B","GNB1"],"other_free_text":[]},"mechanistic_narrative":"KCTD17 is a substrate-adaptor for Cullin3-RING E3 ubiquitin ligase complexes that directs the ubiquitin-dependent proteasomal degradation of diverse substrates to regulate ciliogenesis, hepatic lipid metabolism, adipogenesis, liver fibrosis, and tumorigenesis. It assembles as a closed pentameric BTB-domain ring that forms 5:5 heterodecamers with Cul3 and recruits substrates including trichoplein (initiating ciliogenesis by inactivating Aurora-A), PHLPP2 (prolonging Akt signaling to promote hepatic steatosis), OGA (stabilizing ChREBP to drive lipogenic gene expression), CHOP (modulating adipogenesis), LZTR1 (stabilizing Ras to promote hepatocellular carcinoma), and Zbtb7b (suppressing SERPINA3 to drive liver fibrosis) [PMID:25270598, PMID:28963344, PMID:28859855, PMID:36402191, PMID:36868076, PMID:39098817, PMID:40744994]. Independent of its E3 ligase adaptor function, KCTD17 binds Gβγ subunits through its C-terminus to attenuate Gβγ-mediated sensitization of adenylyl cyclase 5, thereby shaping GPCR-cAMP signaling [PMID:36736897]. KCTD17 shares partially redundant roles with the paralogous adaptors KCTD2 and KCTD5 in controlling cell growth and Gβ1 protein levels [PMID:38732215]."},"prefetch_data":{"uniprot":{"accession":"Q8N5Z5","full_name":"BTB/POZ domain-containing protein KCTD17","aliases":[],"length_aa":314,"mass_kda":34.9,"function":"Substrate-adapter for CUL3-RING ubiquitin ligase complexes which mediates the ubiquitination and subsequent proteasomal degradation of TCHP, a protein involved in ciliogenesis down-regulation. Thereby, positively regulates ciliogenesis, playing a crucial role in the initial steps of axoneme extension (PubMed:25270598). May also play a role in endoplasmic reticulum calcium ion homeostasis (PubMed:25983243)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q8N5Z5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KCTD17","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KCTD17","total_profiled":1310},"omim":[{"mim_id":"616398","title":"DYSTONIA 26, MYOCLONIC; DYT26","url":"https://www.omim.org/entry/616398"},{"mim_id":"616386","title":"POTASSIUM CHANNEL TETRAMERIZATION DOMAIN-CONTAINING PROTEIN 17; KCTD17","url":"https://www.omim.org/entry/616386"},{"mim_id":"612654","title":"TRICHOPLEIN; TCHP","url":"https://www.omim.org/entry/612654"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":147.4}],"url":"https://www.proteinatlas.org/search/KCTD17"},"hgnc":{"alias_symbol":["FLJ12242"],"prev_symbol":[]},"alphafold":{"accession":"Q8N5Z5","domains":[{"cath_id":"3.30.710.10","chopping":"33-137","consensus_level":"high","plddt":91.0751,"start":33,"end":137},{"cath_id":"3.30.70.2000","chopping":"142-177_185-196","consensus_level":"high","plddt":89.6388,"start":142,"end":196}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N5Z5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N5Z5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N5Z5-F1-predicted_aligned_error_v6.png","plddt_mean":70.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KCTD17","jax_strain_url":"https://www.jax.org/strain/search?query=KCTD17"},"sequence":{"accession":"Q8N5Z5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N5Z5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N5Z5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N5Z5"}},"corpus_meta":[{"pmid":"25270598","id":"PMC_25270598","title":"Ubiquitin-proteasome 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depletion of KCTD17 arrests ciliogenesis at the initial step of axoneme extension through aberrant trichoplein-Aurora-A activity.\",\n      \"method\": \"Two-step global E3 ligase screening, siRNA knockdown, ubiquitylation assays, proteasome inhibitor experiments, non-ubiquitylatable trichoplein mutant (K50/57R) expression, immunofluorescence\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (screening, biochemical ubiquitylation assay, genetic rescue, mutagenesis), replicated across conditions\",\n      \"pmids\": [\"25270598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KCTD17 functions downstream of Ndel1 in the trichoplein-Aurora A pathway; coknockdown of KCTD17 reverts unscheduled primary cilia formation induced by Ndel1 depletion, placing KCTD17 (as E3 ligase adaptor for trichoplein) downstream of Ndel1 in suppressing ciliogenesis in proliferating cells.\",\n      \"method\": \"siRNA coknockdown epistasis, forced expression rescue, immunofluorescence, genetic analysis in Ndel1-hypomorphic mice\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis with coknockdown rescue and in vivo mouse model, strong mechanistic placement\",\n      \"pmids\": [\"26880200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KCTD17 BTB domain forms a closed pentameric assembly, binds Cullin3 to reassemble as 5:5 heterodecamers without the expected 3-box motif, as determined by crystal structure and SAXS; KCTD17 BTB pentamer is stable upon size-exclusion chromatography.\",\n      \"method\": \"X-ray crystallography, small-angle X-ray scattering (SAXS), size-exclusion chromatography\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with SAXS validation and biochemical confirmation\",\n      \"pmids\": [\"28963344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KCTD17 mediates glucagon- and PKA-dependent degradation of PHLPP2 in the liver; glucagon/PKA phosphorylates PHLPP2 at Ser1119 and Ser1210, which leads to PHLPP2 binding to KCTD17 (a Cul3-RING ubiquitin ligase adaptor), resulting in ubiquitin-mediated PHLPP2 degradation, prolonged insulin/Akt signaling, and hepatic steatosis.\",\n      \"method\": \"Mass spectrometry identification of phosphorylation sites and interactors, Co-IP, shRNA knockdown in primary hepatocytes and obese mice, CRISPR/Cas9 knockout hepatoma cells, immunoblotting\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including MS interactome, Co-IP, genetic knockdown/knockout with defined phenotypic readouts\",\n      \"pmids\": [\"28859855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Mouse KCTD17 (ortholog of Drosophila Insomniac) can form functional complexes with Cullin3 and traffic to synapses within neurons; KCTD2 and KCTD5 restore sleep to Drosophila inc mutants, indicating functional conservation of the Cul3-adaptor role across vertebrate KCTD2/5/17 orthologs.\",\n      \"method\": \"Biochemical complementation, in vivo sleep rescue assays in Drosophila, neuronal localization imaging, synaptic physiology\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional interchangeability demonstrated in vivo, but KCTD17-specific rescue not individually shown (KCTD2 and KCTD5 tested)\",\n      \"pmids\": [\"28558011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Hepatocyte KCTD17, induced by Srebp1c under obesity/high-fat diet conditions, targets OGA (O-GlcNAcase) for ubiquitin-mediated degradation; Kctd17-induced OGA degradation stabilizes ChREBP protein, promoting lipogenic gene expression and causing glucose intolerance and hepatic steatosis.\",\n      \"method\": \"AAV-CRISPR hepatocyte-specific knockout mice, CRISPR/Cas9 hepatoma cell knockouts, antisense oligonucleotide treatment, forced expression in lean mice, double-knockout epistasis (Kctd17/Oga DKO), immunoblotting, transcriptomic analysis\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genetic models (KO mice, hepatoma cells, ASO), epistasis rescue experiment, and defined molecular mechanism\",\n      \"pmids\": [\"36402191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KCTD17 binds C/EBP homologous protein (CHOP) and targets it for ubiquitin-mediated degradation as a Cullin3-RING E3 ligase adaptor; gain-of-function of Kctd17 inhibits adipogenesis while loss-of-function promotes it, linked to CHOP stabilization.\",\n      \"method\": \"Co-immunoprecipitation, gain/loss-of-function in preadipocytes, ubiquitination assays, immunoblotting\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP and functional gain/loss-of-function with mechanistic substrate identification, single lab\",\n      \"pmids\": [\"36868076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KCTD17 interacts with Gβγ subunits; the C-terminus of KCTD17 is sufficient for Gβγ interaction (unlike KCTD2/KCTD5 which require both BTB and C-terminal regions); KCTD17-Gβγ interaction blunts Gβγ-mediated sensitization of adenylyl cyclase 5, shaping cAMP signaling downstream of GPCRs.\",\n      \"method\": \"Live-cell BRET assay, co-immunoprecipitation, truncation mutant analysis, cAMP pathway sensitization assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two parallel interaction assays (BRET and Co-IP) with functional consequence measured, single lab\",\n      \"pmids\": [\"36736897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KCTD17-Cul3 ubiquitin ligase complex targets LZTR1 (leucine zipper-like transcriptional regulator 1, a known Ras destabilizer) for degradation; KCTD17-mediated LZTR1 degradation stabilizes Ras protein, activating downstream proliferation and migration signaling to promote hepatocellular carcinoma progression.\",\n      \"method\": \"Co-IP/mass spectrometry substrate identification, hepatocyte-specific KCTD17 KO mice with DEN-induced HCC, liver cancer xenograft models, antisense oligonucleotide treatment, immunoblotting\",\n      \"journal\": \"Clinical and molecular hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — substrate identified by Co-IP/MS, validated in multiple in vivo models with defined mechanistic pathway\",\n      \"pmids\": [\"39098817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KCTD2, KCTD5, and KCTD17 have redundant roles in controlling cellular growth and regulating Gβ1 protein levels; progressive triple knockout of all three isoforms in HEK293 cells causes the most pervasive effects on cell growth and gene expression, with KCTD KO having opposite effects on G protein subunit gene expression compared to GNB1 KO.\",\n      \"method\": \"Sequential CRISPR/Cas9 knockout in HEK293 cells, cell growth assays, transcriptomic analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, but redundancy complicates KCTD17-specific attribution\",\n      \"pmids\": [\"38732215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KCTD17 regulates liver fibrosis in MASH by facilitating ubiquitin-mediated degradation of transcription factor Zbtb7b, which diminishes SERPINA3 secretion; reduced SERPINA3 leads to Par2/TGFβ-mediated activation of hepatic stellate cells and fibrosis; KCTD17 depletion increases SERPINA3 levels and reduces fibrosis.\",\n      \"method\": \"KCTD17 depletion in dietary rodent MASH models, pharmacological inhibition, immunoblotting, mechanistic pathway dissection (Zbtb7b ubiquitination, SERPINA3 secretion, stellate cell activation assays)\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway identified with in vivo validation, single lab, novel substrate\",\n      \"pmids\": [\"40744994\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KCTD17 functions primarily as a substrate-adaptor for Cullin3-RING E3 ubiquitin ligase complexes, forming closed pentameric BTB-domain assemblies that bind Cul3 as 5:5 heterodecamers; it targets multiple substrates for ubiquitin-mediated proteasomal degradation—including trichoplein (to initiate ciliogenesis via Aurora-A inactivation), PHLPP2 (promoting hepatic lipogenesis via prolonged Akt signaling), OGA (stabilizing ChREBP to drive lipogenesis), CHOP (regulating adipogenesis), LZTR1 (stabilizing Ras to promote HCC), and Zbtb7b (suppressing SERPINA3 to promote liver fibrosis)—while also interacting with Gβγ subunits through its C-terminus to modulate GPCR-cAMP signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"KCTD17 is a substrate-adaptor for Cullin3-RING E3 ubiquitin ligase complexes that directs the ubiquitin-dependent proteasomal degradation of diverse substrates to regulate ciliogenesis, hepatic lipid metabolism, adipogenesis, liver fibrosis, and tumorigenesis. It assembles as a closed pentameric BTB-domain ring that forms 5:5 heterodecamers with Cul3 and recruits substrates including trichoplein (initiating ciliogenesis by inactivating Aurora-A), PHLPP2 (prolonging Akt signaling to promote hepatic steatosis), OGA (stabilizing ChREBP to drive lipogenic gene expression), CHOP (modulating adipogenesis), LZTR1 (stabilizing Ras to promote hepatocellular carcinoma), and Zbtb7b (suppressing SERPINA3 to drive liver fibrosis) [PMID:25270598, PMID:28963344, PMID:28859855, PMID:36402191, PMID:36868076, PMID:39098817, PMID:40744994]. Independent of its E3 ligase adaptor function, KCTD17 binds Gβγ subunits through its C-terminus to attenuate Gβγ-mediated sensitization of adenylyl cyclase 5, thereby shaping GPCR-cAMP signaling [PMID:36736897]. KCTD17 shares partially redundant roles with the paralogous adaptors KCTD2 and KCTD5 in controlling cell growth and Gβ1 protein levels [PMID:38732215].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"The first substrate and biological function of KCTD17 were identified: it serves as the Cul3 adaptor that ubiquitylates trichoplein at mother centrioles, triggering trichoplein destruction and allowing axoneme extension during ciliogenesis.\",\n      \"evidence\": \"Global E3 ligase screen, siRNA, ubiquitylation assays, non-ubiquitylatable trichoplein mutant rescue in RPE1 cells\",\n      \"pmids\": [\"25270598\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for trichoplein recognition by KCTD17 not determined\",\n        \"Whether KCTD17 has substrates beyond trichoplein was unknown\",\n        \"Signal that activates KCTD17-mediated trichoplein degradation at cell-cycle exit not identified\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Epistasis analysis placed KCTD17 downstream of Ndel1 in the trichoplein–Aurora-A ciliary suppression pathway, establishing the signaling hierarchy controlling ciliogenesis in proliferating versus quiescent cells.\",\n      \"evidence\": \"siRNA coknockdown epistasis in mammalian cells and Ndel1-hypomorphic mouse model\",\n      \"pmids\": [\"26880200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct mechanism by which Ndel1 regulates KCTD17 activity not elucidated\",\n        \"Whether this pathway operates in all ciliated cell types remains untested\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The structural basis of KCTD17 assembly was resolved: its BTB domain forms a closed pentameric ring that binds Cul3 in an unusual 5:5 heterodecameric architecture lacking the canonical 3-box motif, explaining how this adaptor oligomerizes and engages the ubiquitin ligase machinery.\",\n      \"evidence\": \"X-ray crystallography, SAXS, and size-exclusion chromatography\",\n      \"pmids\": [\"28963344\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structure of the KCTD17–substrate complex available\",\n        \"How the pentameric ring accommodates substrate geometry is unclear\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"KCTD17 was linked to hepatic metabolism: glucagon/PKA-dependent phosphorylation of PHLPP2 creates a KCTD17-binding degron, and KCTD17-mediated PHLPP2 destruction prolongs insulin/Akt signaling to drive hepatic lipogenesis and steatosis, revealing the first metabolic substrate of KCTD17.\",\n      \"evidence\": \"Mass spectrometry phosphosite and interactome mapping, shRNA in primary hepatocytes and obese mice, CRISPR KO hepatoma cells\",\n      \"pmids\": [\"28859855\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether KCTD17 expression itself is nutritionally regulated was not addressed\",\n        \"Relative contribution of KCTD17 versus other PHLPP2 degradation pathways in vivo not quantified\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Functional conservation between mammalian KCTD17 and Drosophila Insomniac was demonstrated: mouse KCTD17 forms Cul3 complexes and traffics to synapses, and paralogous KCTD2/5 rescue sleep loss in fly inc mutants, suggesting a conserved neural role for this adaptor family.\",\n      \"evidence\": \"Biochemical complementation, in vivo sleep rescue in Drosophila, neuronal imaging\",\n      \"pmids\": [\"28558011\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"KCTD17-specific rescue in the Drosophila sleep assay was not individually demonstrated\",\n        \"Neural substrates of KCTD17 in the mammalian brain remain unidentified\",\n        \"Whether KCTD17 has non-redundant roles in sleep regulation is untested\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A second metabolic substrate was identified: KCTD17, induced by Srebp1c under obesity, degrades OGA, leading to stabilized ChREBP protein and enhanced lipogenic gene expression, establishing KCTD17 as a feed-forward amplifier of hepatic lipogenesis.\",\n      \"evidence\": \"AAV-CRISPR hepatocyte-specific KO mice, ASO treatment, Kctd17/Oga double-KO epistasis, transcriptomics\",\n      \"pmids\": [\"36402191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether KCTD17-mediated OGA degradation affects O-GlcNAcylation of targets beyond ChREBP not examined\",\n        \"Potential therapeutic window for KCTD17 inhibition in metabolic disease not evaluated\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"KCTD17 was shown to degrade CHOP in preadipocytes, linking its E3 adaptor function to adipogenesis control—KCTD17 gain-of-function inhibits and loss-of-function promotes adipocyte differentiation.\",\n      \"evidence\": \"Co-immunoprecipitation, ubiquitination assay, gain/loss-of-function in preadipocytes\",\n      \"pmids\": [\"36868076\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding; independent confirmation needed\",\n        \"Whether KCTD17 regulates CHOP in tissues other than adipose not tested\",\n        \"Degron on CHOP recognized by KCTD17 not mapped\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"An E3-independent function of KCTD17 was uncovered: its C-terminus binds Gβγ subunits and blunts Gβγ-dependent sensitization of adenylyl cyclase 5, establishing KCTD17 as a modulator of GPCR–cAMP signaling distinct from its ubiquitin ligase adaptor role.\",\n      \"evidence\": \"Live-cell BRET, Co-IP, truncation mutant analysis, cAMP sensitization assay\",\n      \"pmids\": [\"36736897\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding; functional significance in vivo not demonstrated\",\n        \"Whether Gβγ sequestration and Cul3-adaptor activities compete or cooperate is unknown\",\n        \"Physiological contexts where this signaling modulation is relevant remain unidentified\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"KCTD17 was shown to promote hepatocellular carcinoma by degrading LZTR1, a Ras destabilizer; KCTD17-mediated LZTR1 destruction stabilizes Ras and activates proliferation/migration, positioning KCTD17 as an oncogenic driver in liver cancer.\",\n      \"evidence\": \"Co-IP/MS substrate identification, hepatocyte-specific KO mice with DEN-induced HCC, xenograft models, ASO treatment\",\n      \"pmids\": [\"39098817\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether KCTD17-LZTR1 axis operates in cancers beyond HCC not explored\",\n        \"Degron on LZTR1 and regulatory signals promoting this degradation not identified\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Redundancy among KCTD2/5/17 in cell growth control and Gβ1 regulation was quantified: progressive triple KO produced the strongest growth and transcriptomic effects, and KCTD KO had opposite gene-expression signatures to GNB1 KO, clarifying functional overlap within this paralog family.\",\n      \"evidence\": \"Sequential CRISPR KO in HEK293 cells, cell growth assays, transcriptomics\",\n      \"pmids\": [\"38732215\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"KCTD17-specific versus shared contributions could not be fully resolved due to redundancy\",\n        \"Whether redundancy holds in differentiated tissues with distinct expression patterns is untested\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"KCTD17 was identified as a driver of liver fibrosis in MASH through a novel pathway: it degrades Zbtb7b, reducing SERPINA3 secretion and thereby activating hepatic stellate cells via Par2/TGFβ signaling.\",\n      \"evidence\": \"KCTD17 depletion in dietary MASH rodent models, pharmacological inhibition, Zbtb7b ubiquitination and SERPINA3 secretion assays, stellate cell activation\",\n      \"pmids\": [\"40744994\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding on a novel substrate; independent validation needed\",\n        \"Direct binding interface between KCTD17 and Zbtb7b not mapped\",\n        \"Whether KCTD17 targeting in fibrosis is therapeutically feasible is unexplored\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: what structural features define KCTD17 substrate degrons, how the pentameric ring coordinates multi-substrate recognition, whether the Gβγ-binding and Cul3-adaptor functions are functionally coupled in vivo, and whether KCTD17 has non-redundant roles in the nervous system.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No co-crystal structure of KCTD17 bound to any substrate\",\n        \"No in vivo characterization of KCTD17-specific neural functions\",\n        \"Substrate selection logic across diverse degrons remains undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 5, 6, 8, 10]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 3, 5, 6, 8, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 2, 3, 5, 6, 8, 10]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 10]}\n    ],\n    \"complexes\": [\n      \"CRL3-KCTD17 (Cul3-RING E3 ubiquitin ligase)\"\n    ],\n    \"partners\": [\n      \"CUL3\",\n      \"TCHP\",\n      \"PHLPP2\",\n      \"OGA\",\n      \"CHOP\",\n      \"LZTR1\",\n      \"ZBTB7B\",\n      \"GNB1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}