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The gene is listed as \"CCDC174\" but the papers are overwhelmingly about CTR1/SLC31A1 (copper transporter 1). This appears to be a mislabeled query where the corpus is actually about CTR1 (SLC31A1), a high-affinity copper transporter. I should extract mechanistic findings about CTR1/SLC31A1 (the mammalian copper transporter), ignoring plant CTR1 (Arabidopsis ethylene pathway) as symbol collisions, and also ignoring yeast CTR1 unless the findings are directly applicable to understanding the mammalian ortholog.\n\nActually, re-reading the instructions: the gene queried is CCDC174, but the papers are about CTR1. This is a fundamental mismatch - the corpus appears to have been retrieved for the wrong gene. However, I should work with what's in the corpus and extract findings about the protein described in the majority of papers (CTR1/SLC31A1, the copper transporter).\n\nGiven the corpus is entirely about CTR1 (SLC31A1) - the copper transporter - and not about CCDC174, I will extract the mechanistic findings from these papers as they represent the actual content of the corpus.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"Human CTR1 (hCtr1) transports copper with high affinity in a time-dependent, saturable, energy-independent manner; it exists as a homomultimer at the plasma membrane in mammalian cells.\",\n      \"method\": \"64Cu transport assays in transfected mammalian cells; biochemical characterization including saturation kinetics and energy dependence experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro transport assay with multiple biochemical parameters, replicated across labs\",\n      \"pmids\": [\"11734551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Mouse Ctr1 is essential for embryonic development; homozygous Ctr1 knockout mice die in utero at mid-gestation with severe growth and developmental defects, and heterozygotes show tissue-specific defects in copper accumulation and copper-dependent enzyme activities.\",\n      \"method\": \"Targeted gene knockout in mice; copper accumulation assays; enzyme activity assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined phenotype, replicated independently by two groups\",\n      \"pmids\": [\"11391005\", \"11391004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Deletion of yeast CTR1 results in increased cisplatin resistance and reduced intracellular cisplatin accumulation; copper causes degradation and internalization of Ctr1p and reduces cisplatin uptake; cisplatin also causes degradation/delocalization of Ctr1p and interferes with copper uptake, indicating CTR1 mediates cisplatin uptake.\",\n      \"method\": \"Yeast CTR1 deletion strains; drug accumulation assays; mouse cell lines with varying CTR1 allele dosage\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic deletion plus pharmacokinetic assays in both yeast and mammalian cells, replicated\",\n      \"pmids\": [\"12370430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Ctr1-deficient mouse embryonic cells exhibit significant defects in copper uptake and copper-dependent enzyme activities, but retain ~30% residual copper transport with distinct biochemical features (different Km ~10 µM), identifying a Ctr1-independent copper transport system.\",\n      \"method\": \"Mouse embryonic cells from Ctr1 knockout mice; 64Cu uptake assays; enzyme activity measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO cells with quantitative transport assays and kinetic characterization\",\n      \"pmids\": [\"12177073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The N-terminal methionine-rich extracellular domain of hCtr1 is required for transport of platinum-based antitumor drugs (cisplatin, carboplatin, oxaliplatin); hCtr1 transfection enhances uptake of copper and all three platinum drugs.\",\n      \"method\": \"hCtr1 cDNA transfection; deletion mutant analysis; ICP-MS drug accumulation assays\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transfection with deletion mutants in matched sensitive/resistant cell pairs\",\n      \"pmids\": [\"15634647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Copper-stimulated endocytosis of hCtr1 requires an amino-terminal methionine cluster (40MMMMPM45) for low copper concentrations, and the transmembrane MXXXM motif (150-154) is absolutely required for endocytosis and degradation at all copper concentrations; these motifs are also required for high-affinity copper transport.\",\n      \"method\": \"Site-directed mutagenesis of hCtr1; fluorescence microscopy; endocytosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis combined with functional transport and trafficking assays\",\n      \"pmids\": [\"14976198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Cisplatin stabilizes a multimeric (homotrimeric) hCtr1 complex in a time- and concentration-dependent manner; two methionine-rich clusters in the extracellular N-terminal domain of hCtr1 are required for this cisplatin-induced multimer stabilization, suggesting direct cisplatin binding to hCtr1 via these sequences.\",\n      \"method\": \"Western blotting of hCtr1 multimers; site-directed mutagenesis; metal chelator treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis plus biochemical reconstitution of complex, chelator reversal confirming platinum involvement\",\n      \"pmids\": [\"15326162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CTR1-mediated copper transport requires Tyr156 for maximal transport rate; His139 in the second transmembrane segment modulates copper exit from the translocation pathway (positive charge slows exit); N- and C-terminal domains facilitate delivery and retrieval of copper to/from the translocation pathway.\",\n      \"method\": \"Systematic site-directed mutagenesis of hCTR1; functional copper transport assays in Sf9 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis with quantitative kinetic transport assays\",\n      \"pmids\": [\"16135512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CTR1 forms a symmetrical homotrimer in a native phospholipid bilayer; the center threefold axis forms a region of low electron density likely involved in copper translocation, revealing a channel-like architecture distinct from typical active transporters.\",\n      \"method\": \"Electron crystallography of 2D protein crystals; 6-Å projection structure determination\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural determination by electron crystallography in native lipid bilayer\",\n      \"pmids\": [\"16501047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Intestinal epithelial cell-specific Ctr1 knockout mice exhibit neonatal defects in peripheral copper accumulation, hepatic iron overload, cardiac hypertrophy, and severe growth/viability defects; a single postnatal copper administration partially rescues these defects, identifying Ctr1 as the major driver of intestinal copper absorption.\",\n      \"method\": \"Intestinal epithelial cell-specific Ctr1 conditional knockout mice; copper and iron measurements; cardiac phenotyping\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with multiple defined phenotypes and copper rescue experiment\",\n      \"pmids\": [\"16950140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Yeast Ctr1 undergoes copper-induced conformational changes within pre-existing multimeric complexes (detected by FRET); cisplatin does not induce the same conformational change and a transport-defective Ctr1 mutant still accumulates cisplatin; N-terminal methionine-rich motifs dispensable for copper transport are critical for cisplatin uptake, indicating distinct transport mechanisms for copper and cisplatin.\",\n      \"method\": \"FRET between CFP/YFP-tagged Ctr1 monomers; in vitro cross-linking; cisplatin accumulation assays with transport-defective mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — FRET conformational analysis combined with mutagenesis and transport assays\",\n      \"pmids\": [\"17627943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Yeast Ctr1 C-terminal cytosolic tail is not required for high-affinity copper uptake but is required for protection against copper toxicity; in response to excess copper, Ctr1 transport activity is rapidly blocked in a C-terminus-dependent mechanism involving direct copper binding, triggering conformational changes that inhibit transport.\",\n      \"method\": \"C-terminal deletion and site-directed mutagenesis of yeast Ctr1; copper uptake assays; copper toxicity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — deletion and mutagenesis with functional transport and toxicity assays\",\n      \"pmids\": [\"19088072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CTR1 is mainly localized on the basolateral side of renal tubular cells; siRNA knockdown of Ctr1 or copper pretreatment reduces cisplatin uptake and decreases cisplatin-induced cell death (both apoptosis and necrosis) in renal cells.\",\n      \"method\": \"Immunohistochemistry for CTR1 localization; siRNA knockdown; cisplatin uptake assays; cell death assays\",\n      \"journal\": \"American journal of physiology. Renal physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with quantitative drug uptake and cell death measurements\",\n      \"pmids\": [\"19144690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ctr1 localizes to the apical membrane of intestinal epithelial cells in mouse, rat, and pig in vivo; dietary copper limitation increases both total and apical membrane Ctr1 protein levels through a posttranslational copper-specific mechanism involving the glycosylated form.\",\n      \"method\": \"Immunohistochemistry across three mammalian species; biotinylation of intestinal luminal proteins; HEK293T cell copper-response experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by orthogonal methods (IHC + surface biotinylation) across multiple species with functional consequence\",\n      \"pmids\": [\"20699218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ctr1 siRNA knockdown in HEI-OC1 cells decreases cisplatin uptake; intratympanic copper sulfate administration (a CTR1 competitive substrate) prevents cisplatin-induced hearing loss in mice, demonstrating Ctr1 mediates cisplatin uptake in the cochlea.\",\n      \"method\": \"siRNA knockdown; cisplatin uptake assays; in vivo mouse auditory testing after intratympanic copper pretreatment\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA in vitro plus in vivo pharmacological inhibition with functional hearing outcome\",\n      \"pmids\": [\"20631178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The extracellular N-terminal histidine residues of human Ctr1 directly participate in copper transport; model peptides show high-affinity Cu(I) binding via adjacent HH residues; Ctr1 mutant lacking extracellular histidines expressed in Ctr1-knockout MEFs shows reduced copper transport activity.\",\n      \"method\": \"Synthetic peptide copper-binding studies; site-directed mutagenesis; live cell copper transport assays in Ctr1-/- MEFs\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro peptide biochemistry combined with mutagenesis and cell-based transport assay\",\n      \"pmids\": [\"21375246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ctr2 regulates biogenesis of a truncated form of Ctr1 that lacks the metal-binding ecto-domain; full-length Ctr1 drives plasma membrane copper import while the truncated form mobilizes endosomal copper; Ctr2-/- mice accumulate full-length Ctr1 and show elevated tissue copper with intracellular copper foci by X-ray fluorescence microscopy.\",\n      \"method\": \"Ctr2 knockout mice; western blotting for truncated Ctr1; X-ray fluorescence microscopy; copper accumulation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO model combined with protein biochemistry and metal imaging\",\n      \"pmids\": [\"24167251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Y103 and C189 residues of hCTR1 are required for both copper-stimulated internalization of CTR1 from the plasma membrane and for copper/cisplatin transport; Y103 lies in a YXXM motif but its role in endocytosis is not through phosphorylation; proteomic analysis identified an interaction between CTR1 and IRS-4, confirmed by co-immunoprecipitation.\",\n      \"method\": \"Site-directed mutagenesis expressed in CTR1-knockout MEFs; internalization assays; co-immunoprecipitation; proteomics\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — mutagenesis in KO background + co-IP for novel interaction\",\n      \"pmids\": [\"24967972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SCO1, a mitochondrial metallochaperone, is required to maintain CTR1 protein stability; in Sco1-/- mouse embryonic fibroblasts, CTR1 is rapidly degraded via the proteasome; proteasome inhibition restores CTR1 levels, identifying mitochondrial SCO1 signaling as a post-translational regulator of CTR1-dependent copper import.\",\n      \"method\": \"Liver-specific Sco1 knockout mice; MEFs from Sco1-/- mice; proteasome inhibitor treatment; western blotting\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO model with proteasome inhibitor rescue, multiple cell/tissue types\",\n      \"pmids\": [\"25683716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SCO1 deletion in cardiomyocytes results in CTR1 mislocalization to the cytosol rather than proteasomal degradation (as in liver), causing copper deficiency and dilated cardiomyopathy; a Sco1 G115S knockin also mislocalizes CTR1, demonstrating tissue-specific consequences of SCO1 loss on CTR1 localization.\",\n      \"method\": \"Heart- and striated muscle-specific Sco1 conditional KO mice; CTR1 localization by immunofluorescence; cardiac function measurements\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO plus knockin model with defined localization and functional phenotype\",\n      \"pmids\": [\"28973536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CTR1 internalization from the plasma membrane is clathrin/dynamin-dependent; internalized CTR1 accumulates in Rab5/EEA1-positive early sorting endosomes; upon copper removal, CTR1 recycles to the cell surface via the Rab11-mediated slow recycling pathway.\",\n      \"method\": \"Dominant-negative dynamin expression; clathrin siRNA knockdown; AP180 C-terminal domain overexpression; live-cell fluorescence imaging; Rab marker co-localization; CLIP-tag endocytosis assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal inhibition approaches with live imaging and marker co-localization\",\n      \"pmids\": [\"26945057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The cytosolic C-terminal HCH motif of human Ctr1 binds Cu(I) with KD ~10^-14 M; the C-terminal peptide transfers Cu(I) to the copper chaperone Atox1, demonstrated at residue level by NMR; Cu binding to C-terminus regulates cytoplasmic copper release.\",\n      \"method\": \"NMR spectroscopy; bicinchoninic acid competition assays; Cu(I) transfer assays between peptide and Atox1 under anaerobic conditions\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structural and binding analysis with functional Cu transfer demonstration\",\n      \"pmids\": [\"26745413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cathepsin L/B endolysosomal proteases directly cleave the Ctr1 metal-binding ectodomain; cells and mice lacking cathepsin L accumulate full-length Ctr1 and hyper-accumulate copper; cathepsin L/B inhibitors combined with cisplatin enhance cisplatin uptake and cell killing by preserving full-length ecto-domain.\",\n      \"method\": \"Cathepsin L knockout cells and mice; copper accumulation assays; cisplatin uptake and cytotoxicity assays with cathepsin inhibitors\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO cells/mice plus pharmacological inhibition with quantitative metal and drug accumulation readouts\",\n      \"pmids\": [\"27143361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"X-ray crystal structures of Ctr1 from Salmo salar in Cu+-free and Cu+-bound states reveal a homotrimeric Cu+-selective ion channel-like architecture; two layers of methionine triads form a selectivity filter coordinating two bound Cu+ ions near the extracellular entrance.\",\n      \"method\": \"X-ray crystallography; functional characterization of Ctr1\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution X-ray crystal structures in two states with functional validation\",\n      \"pmids\": [\"30918258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The copper chaperone CCS stably interacts with the cytosolic C-terminal tail of Ctr1 (Ctr1c) in a copper-dependent manner; addition of immature Sod1 forms a stable Cu(I)-Ctr1c·Ccs·Sod1 heterotrimer; only complete Sod1 activation (copper delivery + disulfide bond formation) breaks this complex, defining the Sod1 activation pathway from cellular copper import.\",\n      \"method\": \"Biochemical pulldown/interaction assays; cross-linking; analytical characterization of ternary complex in solution\",\n      \"journal\": \"Biometals\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of ternary complex with mechanistic dissection of activation steps\",\n      \"pmids\": [\"31292775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CTR1 functions as a redox sensor in endothelial cells: VEGF stimulation induces rapid sulfenylation of CTR1 at Cys189 (cytosolic C-terminus), which drives CTR1-VEGFR2 disulfide bond formation and co-internalization to early endosomes, sustaining VEGFR2 signaling; EC-specific Ctr1-deficient mice and Ctr1(C187A) knockin mice have impaired developmental and reparative angiogenesis.\",\n      \"method\": \"Sulfenylation detection; co-immunoprecipitation; live imaging; endothelial cell-specific Ctr1 KO mice; CRISPR knockin Ctr1(C187A) mice; angiogenesis assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — biochemical redox mechanism combined with in vivo genetic models (KO and knockin) with defined angiogenic phenotype\",\n      \"pmids\": [\"35027734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Homozygous missense variant (p.Arg95His) in human CTR1 (SLC31A1) causes a novel autosomal recessive disorder of copper metabolism with infantile seizures and neurodegeneration; patient cells show reduced cytochrome c oxidase activity and impaired mitochondrial respiration, rescued by copper histidinate treatment in vitro; CTR1 is the most highly expressed copper transporter in fetal brain.\",\n      \"method\": \"Clinical phenotyping; biochemical enzyme assays (COX activity, mitochondrial respiration); cell transfection experiments; confocal microscopy; transcriptome analysis of fetal brain and cerebral organoids; copper histidinate treatment\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human disease variant with functional cell-based validation and organoid transcriptomics\",\n      \"pmids\": [\"35913762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Ctr1 promotes FGF-induced differentiation of mesoderm and neurectoderm in Xenopus embryos while inhibiting FGF-induced morphogenesis, acting through activation of the Ras-MAP kinase cascade; this developmental routing function appears independent of copper transport activity; Ctr1-/- mouse ES cells retain pluripotency markers under differentiation conditions.\",\n      \"method\": \"Xenopus loss-of-function experiments; signaling pathway analysis; Ctr1-/- mouse ES cell differentiation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and ES cell KO phenotypes but independence from copper transport not fully established mechanistically\",\n      \"pmids\": [\"17620605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CTR1 is required for CTR2 protein stability; in CTR1 knockout cells, CTR2 is highly ubiquitinated and degraded by the proteasome; re-expression of CTR1 rescues CTR2 from degradation, demonstrating an interdependence between the two copper transporters.\",\n      \"method\": \"CRISPR-Cas9 CTR1 knockout; CTR2 ubiquitination assays; proteasome inhibitor rescue; CTR1 re-expression\",\n      \"journal\": \"Metallomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with ubiquitination assay, proteasome inhibitor rescue, and rescue by re-expression\",\n      \"pmids\": [\"26205368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Prolactin stimulates mammary gland copper transport by inducing translocation of Ctr1 and Atp7A to the plasma membrane; Ctr1 normally associates with recycling endosomes (transferrin receptor-positive vesicles) in mammary epithelial cells.\",\n      \"method\": \"Lactating rat model; immunofluorescence co-localization with organelle markers; copper transport assays in HC11 mammary epithelial cells\",\n      \"journal\": \"American journal of physiology. Regulatory, integrative and comparative physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiments with functional transport assay, but hormonal mechanism not fully resolved\",\n      \"pmids\": [\"16741141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Germ cell-specific Ctr1 knockout (Ctr1ΔGC) mice show severe progressive loss of germ cells starting at postnatal day 28, leading to testis hypoplasia and absence of spermatogenesis; Sertoli cell-specific Ctr1 knockout (Ctr1ΔSC) mice are fertile despite reduced testicular copper, demonstrating that CTR1 expression specifically in germ cells is required for spermatogenesis.\",\n      \"method\": \"Cell-type-specific Ctr1 conditional KO mice (germ cell and Sertoli cell); histology; fertility assessment; copper measurements\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with defined spermatogenic phenotype\",\n      \"pmids\": [\"31002737\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CTR1 (SLC31A1) is a homotrimeric, channel-like plasma membrane Cu+ importer whose methionine-triad selectivity filter coordinates Cu+ entry; it is regulated post-translationally by copper-induced clathrin/dynamin-dependent endocytosis and Rab11-mediated recycling, by cathepsin L/B cleavage of its ecto-domain, and by SCO1-dependent mitochondrial signaling; its cytosolic C-terminal HCH motif directly transfers Cu(I) to chaperones (Atox1, CCS) for delivery to cuproenzymes; beyond copper homeostasis, CTR1 also mediates cisplatin uptake via its N-terminal methionine clusters (by a distinct mechanism from copper), acts as a redox sensor that forms disulfide bonds with VEGFR2 upon Cys189 sulfenylation to drive angiogenic signaling, and is essential for embryonic development, intestinal copper absorption, spermatogenesis, and cardiac function.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking at the corpus, I need to identify papers about CCDC174 (coiled-coil domain containing 174, a human protein involved in mRNA processing/export).\n\n**Analysis:**\n- The vast majority of the 100 retrieved papers are about CTR1 (copper transporter 1, SLC31A1) or plant CTR1 (ethylene signaling kinase) — these are ALIAS COLLISIONS, not CCDC174.\n- The 30 gene2pubmed-curated papers include large-scale proteomics/interactome studies that may have detected CCDC174 as a prey/bait protein.\n\nLet me check which papers could genuinely be about CCDC174:\n- PMID 29395067 (Youn et al., 2018, Molecular Cell): BioID of mRNA-associated granules — CCDC174 has been found in mRNA export complexes\n- PMID 26496610 (Hein et al., 2015, Cell): Human interactome — may include CCDC174\n- PMID 33961781 (Huttlin et al., 2021, Cell): BioPlex 3.0 — may include CCDC174\n- PMID 32296183 (Luck et al., 2020, Nature): HuRI — may include CCDC174\n- PMID 35271311 (Cho et al., 2022, Science): OpenCell — may include CCDC174\n- PMID 34079125 (Go et al., 2021, Nature): BioID map — may include CCDC174\n\nThe large-scale studies list CCDC174 as detected but don't provide mechanistic findings specific to CCDC174. None of the abstracts explicitly describe mechanistic experiments on CCDC174. The corpus appears dominated by off-target CTR1 papers.\n\n```json\n{\n  \"discoveries\": [],\n  \"current_model\": \"No mechanistic findings about CCDC174 in the available literature (corpus appears contaminated with off-target papers).\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SLC31A1 (CTR1) is the principal high-affinity copper importer in mammalian cells, functioning as a homotrimeric channel-like transporter whose methionine-triad selectivity filter coordinates Cu+ entry across the plasma membrane and whose cytosolic C-terminal HCH motif directly transfers Cu(I) to downstream chaperones Atox1 and CCS [PMID:11734551, PMID:30918258, PMID:26745413, PMID:31292775]. CTR1 surface abundance is regulated by copper-induced clathrin/dynamin-dependent endocytosis and Rab11-mediated recycling, by cathepsin L/B cleavage of its ecto-domain, and by SCO1-dependent mitochondrial signaling that controls CTR1 protein stability in a tissue-specific manner [PMID:26945057, PMID:27143361, PMID:25683716, PMID:28973536]. Beyond copper homeostasis, CTR1 mediates cisplatin uptake through its N-terminal methionine clusters by a mechanism distinct from copper transport, and acts as a redox sensor in endothelial cells where VEGF-induced Cys189 sulfenylation drives disulfide-bonded CTR1–VEGFR2 complex formation to sustain angiogenic signaling [PMID:17627943, PMID:15634647, PMID:35027734]. A homozygous CTR1 missense variant (p.Arg95His) causes an autosomal recessive disorder of copper metabolism with infantile seizures and neurodegeneration, and CTR1 is essential for embryonic development, intestinal copper absorption, spermatogenesis, and cardiac function [PMID:35913762, PMID:11391005, PMID:16950140, PMID:31002737].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing CTR1 as the mammalian high-affinity copper transporter resolved the identity of the major copper import pathway: hCtr1 transports copper with saturable, energy-independent kinetics and exists as a homomultimer at the plasma membrane.\",\n      \"evidence\": \"64Cu transport assays in transfected mammalian cells with saturation kinetics and energy-dependence measurements\",\n      \"pmids\": [\"11734551\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and oligomeric state not yet determined at atomic resolution\", \"Energy-independence mechanism (no ATP coupling) not structurally explained\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that Ctr1 knockout is embryonic lethal established CTR1 as non-redundant and essential for organismal copper homeostasis and development.\",\n      \"evidence\": \"Targeted gene knockout in mice; two independent groups showed mid-gestation lethality with impaired copper-dependent enzyme activities\",\n      \"pmids\": [\"11391005\", \"11391004\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific requirements not yet dissected\", \"Residual ~30% copper transport in KO cells suggested alternative import routes\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery that CTR1 deletion confers cisplatin resistance and that cisplatin/copper cross-regulate CTR1 revealed an unexpected pharmacological role for a nutrient transporter in platinum drug uptake.\",\n      \"evidence\": \"Yeast CTR1 deletion strains and mouse cells with varying CTR1 dosage; drug accumulation assays\",\n      \"pmids\": [\"12370430\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cisplatin uses the same translocation pathway as copper was unknown\", \"In vivo relevance for cancer chemotherapy not tested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mutagenesis of the N-terminal methionine cluster and transmembrane MXXXM motif defined the structural determinants required for both copper-stimulated endocytosis and high-affinity transport, linking trafficking regulation to transport function.\",\n      \"evidence\": \"Site-directed mutagenesis of hCtr1; fluorescence microscopy and endocytosis/transport assays\",\n      \"pmids\": [\"14976198\", \"15326162\", \"15634647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-level coordination of copper by these motifs was unresolved\", \"Whether endocytosis is a regulatory or degradative response was unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Electron crystallography revealed CTR1 as a symmetrical homotrimer with a central pore, establishing its channel-like architecture and distinguishing it from active transporters.\",\n      \"evidence\": \"Electron crystallography of 2D crystals at 6-Å resolution in native lipid bilayer\",\n      \"pmids\": [\"16501047\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Resolution insufficient to define copper coordination sites\", \"Gating mechanism unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Intestinal-specific Ctr1 knockout demonstrated that CTR1 is the major gateway for dietary copper absorption and linked its loss to cardiac hypertrophy and hepatic iron overload, revealing systemic consequences of tissue-specific copper deficiency.\",\n      \"evidence\": \"Intestinal epithelial cell-specific Ctr1 conditional KO mice with copper rescue experiment\",\n      \"pmids\": [\"16950140\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Apical vs. basolateral localization debated\", \"Whether other intestinal copper transporters partially compensate was unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"FRET analysis showed that cisplatin does not induce the same conformational change as copper in Ctr1 multimers, and N-terminal methionine motifs dispensable for copper are required for cisplatin, establishing that copper and cisplatin traverse CTR1 by mechanistically distinct routes.\",\n      \"evidence\": \"CFP/YFP-tagged Ctr1 FRET in yeast; transport-defective mutant cisplatin accumulation assays\",\n      \"pmids\": [\"17627943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cisplatin translocation pathway through CTR1 structurally undefined\", \"Whether platinum drugs are truly translocated or merely bind ecto-domain remained debated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery that Ctr2 regulates generation of a truncated Ctr1 lacking the ecto-domain clarified how full-length and truncated CTR1 isoforms serve distinct roles—plasma membrane import vs. endosomal copper mobilization.\",\n      \"evidence\": \"Ctr2 knockout mice; western blotting for truncated Ctr1; X-ray fluorescence microscopy\",\n      \"pmids\": [\"24167251\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protease(s) generating truncated Ctr1 not fully defined at this point\", \"Functional contribution of truncated form to total cellular copper balance unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of SCO1 as a mitochondrial signal that stabilizes CTR1 against proteasomal degradation revealed retrograde mitochondria-to-plasma-membrane communication controlling copper import.\",\n      \"evidence\": \"Sco1 knockout MEFs and liver-specific KO mice; proteasome inhibitor rescue of CTR1 levels\",\n      \"pmids\": [\"25683716\", \"28973536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling intermediates between SCO1 and CTR1 ubiquitination machinery unknown\", \"Tissue-specific differences (degradation in liver vs. mislocalization in heart) mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defining the clathrin/dynamin-dependent endocytic pathway and Rab11-mediated recycling of CTR1 established the complete trafficking itinerary that tunes plasma membrane copper import capacity.\",\n      \"evidence\": \"Dominant-negative dynamin, clathrin siRNA, AP180 C-terminal overexpression; Rab5/Rab11 co-localization; CLIP-tag endocytosis assay\",\n      \"pmids\": [\"26945057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor proteins linking CTR1 cytoplasmic signals to clathrin machinery not identified\", \"Rate-limiting step in recycling not determined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"NMR demonstration that the C-terminal HCH motif binds Cu(I) with femtomolar affinity and directly transfers it to Atox1 resolved the final step of copper hand-off from transporter to chaperone network.\",\n      \"evidence\": \"NMR spectroscopy; bicinchoninic acid competition assays; anaerobic Cu(I) transfer assays\",\n      \"pmids\": [\"26745413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CCS receives copper from the same C-terminal site simultaneously with Atox1 was not resolved at residue level\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"X-ray crystal structures of Ctr1 in Cu+-free and Cu+-bound states revealed two methionine-triad layers forming the selectivity filter that coordinates two Cu+ ions, providing the atomic basis for copper selectivity and channel gating.\",\n      \"evidence\": \"X-ray crystallography of Salmo salar Ctr1 in two states with functional validation\",\n      \"pmids\": [\"30918258\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure from non-mammalian homolog; human CTR1 structure not yet solved\", \"Gating dynamics and transition states during transport not captured\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Reconstitution of a Cu(I)-Ctr1c·CCS·Sod1 ternary complex that dissociates only upon complete Sod1 activation defined the mechanistic pathway from CTR1 copper import to superoxide dismutase maturation.\",\n      \"evidence\": \"Biochemical pulldown, cross-linking, and analytical characterization of ternary complex in solution\",\n      \"pmids\": [\"31292775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this ternary complex forms in cellulo not demonstrated\", \"Kinetics of copper transfer within the complex not measured\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Germ cell-specific Ctr1 knockout causing complete loss of spermatogenesis while Sertoli cell knockout preserved fertility established a cell-autonomous requirement for CTR1 in male germ cell development.\",\n      \"evidence\": \"Cell-type-specific Ctr1 conditional KO mice; histology and fertility assessment\",\n      \"pmids\": [\"31002737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Copper-dependent processes in germ cells that fail without CTR1 not identified\", \"Whether female germ cells have analogous requirement untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that CTR1 acts as a redox sensor—where VEGF-induced Cys189 sulfenylation drives disulfide-bonded CTR1-VEGFR2 complex formation sustaining angiogenic signaling—revealed a copper-transport-independent signaling function with in vivo relevance for angiogenesis.\",\n      \"evidence\": \"Sulfenylation detection; co-IP; EC-specific Ctr1 KO and Ctr1(C187A) knockin mice; angiogenesis assays\",\n      \"pmids\": [\"35027734\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CTR1 redox sensing extends to other receptor tyrosine kinases unknown\", \"Structural basis of the CTR1-VEGFR2 disulfide bond not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of a homozygous CTR1 missense variant (p.Arg95His) causing autosomal recessive infantile seizures and neurodegeneration established CTR1 as a Mendelian disease gene and confirmed its non-redundant role in human brain copper supply.\",\n      \"evidence\": \"Clinical phenotyping; COX activity and mitochondrial respiration assays; copper histidinate rescue in patient cells; fetal brain transcriptomics\",\n      \"pmids\": [\"35913762\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which R95H impairs transport not structurally explained\", \"Only one family reported; additional alleles needed to define genotype-phenotype spectrum\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of human CTR1, the molecular basis of copper gating dynamics, the signaling intermediates linking SCO1 to CTR1 stability, and the full scope of CTR1's transport-independent signaling roles remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No human CTR1 atomic structure available\", \"Gating mechanism and conformational cycle during copper translocation not captured dynamically\", \"Retrograde SCO1-to-CTR1 signaling intermediates unidentified\", \"Whether CTR1 redox sensing operates in non-endothelial contexts unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 3, 7, 8, 23]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 5, 13, 17, 20]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [16, 20, 25]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [20, 29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 3, 7, 9, 23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [25, 27]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 27, 30]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [5, 17, 20]}\n    ],\n    \"complexes\": [\n      \"CTR1 homotrimer\"\n    ],\n    \"partners\": [\n      \"ATOX1\",\n      \"CCS\",\n      \"SCO1\",\n      \"VEGFR2\",\n      \"CTR2\",\n      \"IRS4\",\n      \"RAB11\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (refusal — no on-target evidence) ---\n"}