{"gene":"DPCD","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2003,"finding":"DPCD expression increases during ciliated cell differentiation of human airway epithelial cells, whereas POLL expression decreases, suggesting DPCD (not POLL) is the relevant gene for the PCD phenotype observed in the Poll knockout mouse. No disease-causing mutations in DPCD were confirmed in 51 PCD patients, though one variant could not be excluded.","method":"Northern analysis of DPCD and POLL expression during ciliogenesis; sequencing of DPCD coding region in PCD patients","journal":"American journal of respiratory cell and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct expression assay during ciliogenesis in human airway cells, single lab, two orthogonal methods (Northern blot + sequencing)","pmids":["14630615"],"is_preprint":false},{"year":2010,"finding":"Dpcd/Poll double-knockout mice exhibit situs inversus, hydrocephalus, sinusitis, and male infertility—phenotypes consistent with deficient motile cilia function—placing DPCD in the pathway required for ciliary motility and left-right asymmetry determination.","method":"Knockout mouse phenotyping (loss-of-function with specific phenotypic readouts including organ laterality, hydrocephalus, sinusitis, infertility)","journal":"Veterinary pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined KO phenotypes with multiple specific readouts in a single study, single lab","pmids":["20080492"],"is_preprint":false},{"year":2011,"finding":"Dpcd knockout mice develop autosomal recessive congenital hydrocephalus with evidence that dysfunctional motile cilia represent the underlying pathogenetic mechanism.","method":"Knockout mouse phenotyping with histopathological analysis","journal":"Veterinary pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined phenotype; corroborates findings from PMID 20080492, providing independent replication","pmids":["21746835"],"is_preprint":false},{"year":2022,"finding":"DPCD directly interacts with RUVBL1 (R1) and RUVBL2 (R2) AAA-ATPases both in vitro and in cells. DPCD disrupts the dodecameric state of the R1R2 complex upon binding, and this interaction occurs mainly via the DII domains of R1 and R2. A 3D structural model of DPCD was built, and biophysical characterization showed DPCD's physico-chemical properties in solution.","method":"Co-immunoprecipitation (in vivo), direct binding assays (in vitro), small-angle X-ray scattering (SAXS), structural mass spectrometry, electron microscopy, and 3D modeling","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal structural and biochemical methods (SAXS, structural MS, EM, in vitro binding, co-IP) in a single rigorous study establishing direct interaction and structural disruption","pmids":["35901867"],"is_preprint":false},{"year":2024,"finding":"DPCD functions as an adaptor of the R2TP chaperone complex (RUVBL1, RUVBL2, RPAP3, PIH1D1) and regulates ciliogenesis initiation through interaction with Akt kinase, modulating Akt phosphorylation levels rather than its stability. DPCD is a heart-shaped monomeric protein with two domains; a highly conserved CS (CHORD- and SGT1-containing) domain in DPCD interacts with the RUVBL2 DII domain with high affinity to form a stable R2TP-DPCD complex both in cellulo and in vitro. RUVBL1/2 are proposed to be CS-domain-binding proteins.","method":"Proximity-labeling mass spectrometry, co-immunoprecipitation, in vitro binding assays, Akt phosphorylation assays, loss-of-function ciliogenesis assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — proximity-labeling MS, reciprocal co-IP, in vitro binding, mutagenesis-level domain mapping, functional ciliogenesis readout, and kinase phosphorylation assay in one study with multiple orthogonal methods","pmids":["38306274"],"is_preprint":false},{"year":2025,"finding":"In Dpcd-/- mice, ependymal cilia show decreased amplitude, abnormal waveforms, and low cerebrospinal fluid flow velocity. The amount of dynein axonemal heavy chains in some inner dynein arms (IDAs) is decreased in ependymal cilia of Dpcd-/- mice, indicating that DPCD is required for proper IDA assembly. In wild-type mice, DPCD localizes to both the cytoplasm and cilia of ependymal cells.","method":"Knockout mouse analysis, high-speed video microscopy of ciliary motility, immunofluorescence/immunohistochemistry for dynein heavy chain quantification, subcellular localization by imaging","journal":"Cytoskeleton (Hoboken, N.J.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with direct functional readouts (motility, CSF flow), protein localization, and axonemal component quantification in a single study","pmids":["40719343"],"is_preprint":false}],"current_model":"DPCD is a CS-domain-containing adaptor protein that associates with the R2TP chaperone complex (via high-affinity interaction with the RUVBL2 DII domain) to regulate ciliogenesis initiation through modulation of Akt kinase phosphorylation; in motile cilia, DPCD localizes to the cytoplasm and ciliary compartment of ependymal cells and is required for proper inner dynein arm (IDA) assembly, such that its loss causes partial IDA defects, aberrant ciliary motility, impaired CSF flow, and downstream phenotypes of primary ciliary dyskinesia including hydrocephalus, situs inversus, sinusitis, and male infertility."},"narrative":{"mechanistic_narrative":"DPCD is a CS-domain adaptor protein required for motile cilia function and the determination of left-right asymmetry [PMID:20080492, PMID:38306274]. It associates with the R2TP chaperone complex (RUVBL1, RUVBL2, RPAP3, PIH1D1), binding the RUVBL2 DII domain through its highly conserved CS domain to form a stable R2TP-DPCD complex; binding to the RUVBL1/2 AAA-ATPases disrupts the dodecameric R1R2 assembly [PMID:35901867, PMID:38306274]. Through this adaptor role DPCD regulates ciliogenesis initiation by modulating Akt kinase phosphorylation rather than Akt stability [PMID:38306274]. In motile cilia DPCD localizes to both the cytoplasm and the ciliary compartment of ependymal cells and is required for proper inner dynein arm assembly, with its loss reducing axonemal dynein heavy chain content, producing abnormal ciliary waveforms and reduced cerebrospinal fluid flow [PMID:40719343]. Loss of DPCD in mice causes phenotypes characteristic of primary ciliary dyskinesia, including hydrocephalus, situs inversus, sinusitis, and male infertility [PMID:20080492, PMID:21746835].","teleology":[{"year":2003,"claim":"Established DPCD, rather than the adjacent POLL gene, as the ciliogenesis-relevant gene by showing its expression is induced during differentiation of ciliated airway epithelium.","evidence":"Northern analysis during ciliated-cell differentiation of human airway epithelial cells plus sequencing of DPCD in PCD patients","pmids":["14630615"],"confidence":"Medium","gaps":["No confirmed disease-causing DPCD mutation identified in PCD patients","Expression correlation does not define molecular function"]},{"year":2010,"claim":"Demonstrated that DPCD loss in mice produces the canonical motile-cilia disease spectrum, placing it functionally in the pathway for ciliary motility and laterality.","evidence":"Dpcd/Poll double-knockout mouse phenotyping with laterality, hydrocephalus, sinusitis and fertility readouts","pmids":["20080492"],"confidence":"Medium","gaps":["Double-knockout design confounds attribution to DPCD alone","Molecular basis of the ciliary defect not addressed"]},{"year":2011,"claim":"Independently confirmed that DPCD-dependent hydrocephalus arises from dysfunctional motile cilia, reinforcing the cilia-centered pathogenesis.","evidence":"Dpcd knockout mouse phenotyping with histopathological analysis","pmids":["21746835"],"confidence":"Medium","gaps":["Does not identify the molecular target of DPCD within the cilium","Mechanism linking cilia dysfunction to hydrocephalus at molecular level unresolved"]},{"year":2022,"claim":"Defined DPCD as a direct binding partner of the RUVBL1/RUVBL2 AAA-ATPases and showed it remodels their oligomeric state, providing the first molecular interaction for the protein.","evidence":"Co-IP, in vitro binding, SAXS, structural mass spectrometry, electron microscopy and 3D modeling","pmids":["35901867"],"confidence":"High","gaps":["Functional consequence of R1R2 dodecamer disruption not established","Link between RUVBL binding and ciliary phenotype not yet shown"]},{"year":2024,"claim":"Integrated DPCD into the R2TP chaperone complex as a CS-domain adaptor and connected it to ciliogenesis initiation via modulation of Akt phosphorylation.","evidence":"Proximity-labeling MS, reciprocal co-IP, in vitro binding, domain mapping, Akt phosphorylation assays and loss-of-function ciliogenesis assays","pmids":["38306274"],"confidence":"High","gaps":["How R2TP-DPCD mechanistically alters Akt phosphorylation is undefined","Whether Akt regulation is the same mechanism operating in motile cilia is unclear"]},{"year":2025,"claim":"Localized DPCD within ependymal cells and tied its loss to defective inner dynein arm assembly, providing a concrete axonemal mechanism for the ciliary motility defect.","evidence":"Dpcd-/- mouse analysis with high-speed video microscopy, dynein heavy chain immunoquantification and subcellular localization imaging","pmids":["40719343"],"confidence":"Medium","gaps":["Only some IDAs affected; basis of selectivity unknown","Mechanistic link between R2TP/Akt activity and IDA assembly not established"]},{"year":null,"claim":"How DPCD's R2TP-adaptor and Akt-modulating activities mechanistically drive inner dynein arm assembly in motile cilia remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified mechanism connecting R2TP chaperone function to axonemal dynein assembly","No human disease-causing mutation confirmed","Structural detail of the R2TP-DPCD-dynein assembly pathway lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,4]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,4]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[5]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5]}],"pathway":[],"complexes":["R2TP"],"partners":["RUVBL1","RUVBL2","RPAP3","PIH1D1","AKT1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BVM2","full_name":"Protein DPCD","aliases":[],"length_aa":203,"mass_kda":23.2,"function":"May play a role in the formation or function of ciliated cells","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q9BVM2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DPCD","classification":"Not Classified","n_dependent_lines":20,"n_total_lines":1208,"dependency_fraction":0.016556291390728478},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DPCD","total_profiled":1310},"omim":[{"mim_id":"619545","title":"HYPOPLASTIC FEMURS AND PELVIS; HYPOFP","url":"https://www.omim.org/entry/619545"},{"mim_id":"616467","title":"DELETED IN PRIMARY CILIARY DYSKINESIA, MOUSE, HOMOLOG OF; DPCD","url":"https://www.omim.org/entry/616467"},{"mim_id":"609721","title":"POLYCYSTIN 1-LIKE 1; PKD1L1","url":"https://www.omim.org/entry/609721"},{"mim_id":"608071","title":"F-BOX AND WD40 DOMAIN PROTEIN 4; FBXW4","url":"https://www.omim.org/entry/608071"},{"mim_id":"606343","title":"POLYMERASE, DNA, LAMBDA; POLL","url":"https://www.omim.org/entry/606343"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Mitotic spindle","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"choroid plexus","ntpm":141.8},{"tissue":"testis","ntpm":135.5}],"url":"https://www.proteinatlas.org/search/DPCD"},"hgnc":{"alias_symbol":["DKFZP566F084","RP11-529I10.4"],"prev_symbol":[]},"alphafold":{"accession":"Q9BVM2","domains":[{"cath_id":"2.60.40.790","chopping":"7-70_90-195","consensus_level":"medium","plddt":94.7294,"start":7,"end":195}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BVM2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BVM2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BVM2-F1-predicted_aligned_error_v6.png","plddt_mean":89.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DPCD","jax_strain_url":"https://www.jax.org/strain/search?query=DPCD"},"sequence":{"accession":"Q9BVM2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BVM2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BVM2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BVM2"}},"corpus_meta":[{"pmid":"21746835","id":"PMC_21746835","title":"Congenital hydrocephalus in genetically engineered mice.","date":"2011","source":"Veterinary pathology","url":"https://pubmed.ncbi.nlm.nih.gov/21746835","citation_count":115,"is_preprint":false},{"pmid":"20080492","id":"PMC_20080492","title":"Situs inversus in Dpcd/Poll-/-, Nme7-/- , and Pkd1l1-/- mice.","date":"2010","source":"Veterinary pathology","url":"https://pubmed.ncbi.nlm.nih.gov/20080492","citation_count":73,"is_preprint":false},{"pmid":"28274425","id":"PMC_28274425","title":"Changes in the myosin secondary structure and shrimp surimi gel strength induced by dense phase carbon dioxide.","date":"2017","source":"Food chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28274425","citation_count":56,"is_preprint":false},{"pmid":"30793182","id":"PMC_30793182","title":"Plant proteases during developmental programmed cell death.","date":"2019","source":"Journal of experimental 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N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/40719343","citation_count":0,"is_preprint":false},{"pmid":"41757576","id":"PMC_41757576","title":"Programmed cell death during plant development.","date":"2026","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/41757576","citation_count":0,"is_preprint":false},{"pmid":"40930353","id":"PMC_40930353","title":"Reducing allergenicity of Trachinotus ovatus parvalbumin: Insights into digestibility and IgE-binding ability after dense phase CO₂ treatment.","date":"2025","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/40930353","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13987,"output_tokens":1714,"usd":0.033835,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8557,"output_tokens":2310,"usd":0.050267,"stage2_stop_reason":"end_turn"},"total_usd":0.084102,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"DPCD expression increases during ciliated cell differentiation of human airway epithelial cells, whereas POLL expression decreases, suggesting DPCD (not POLL) is the relevant gene for the PCD phenotype observed in the Poll knockout mouse. No disease-causing mutations in DPCD were confirmed in 51 PCD patients, though one variant could not be excluded.\",\n      \"method\": \"Northern analysis of DPCD and POLL expression during ciliogenesis; sequencing of DPCD coding region in PCD patients\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct expression assay during ciliogenesis in human airway cells, single lab, two orthogonal methods (Northern blot + sequencing)\",\n      \"pmids\": [\"14630615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Dpcd/Poll double-knockout mice exhibit situs inversus, hydrocephalus, sinusitis, and male infertility—phenotypes consistent with deficient motile cilia function—placing DPCD in the pathway required for ciliary motility and left-right asymmetry determination.\",\n      \"method\": \"Knockout mouse phenotyping (loss-of-function with specific phenotypic readouts including organ laterality, hydrocephalus, sinusitis, infertility)\",\n      \"journal\": \"Veterinary pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined KO phenotypes with multiple specific readouts in a single study, single lab\",\n      \"pmids\": [\"20080492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Dpcd knockout mice develop autosomal recessive congenital hydrocephalus with evidence that dysfunctional motile cilia represent the underlying pathogenetic mechanism.\",\n      \"method\": \"Knockout mouse phenotyping with histopathological analysis\",\n      \"journal\": \"Veterinary pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined phenotype; corroborates findings from PMID 20080492, providing independent replication\",\n      \"pmids\": [\"21746835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DPCD directly interacts with RUVBL1 (R1) and RUVBL2 (R2) AAA-ATPases both in vitro and in cells. DPCD disrupts the dodecameric state of the R1R2 complex upon binding, and this interaction occurs mainly via the DII domains of R1 and R2. A 3D structural model of DPCD was built, and biophysical characterization showed DPCD's physico-chemical properties in solution.\",\n      \"method\": \"Co-immunoprecipitation (in vivo), direct binding assays (in vitro), small-angle X-ray scattering (SAXS), structural mass spectrometry, electron microscopy, and 3D modeling\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal structural and biochemical methods (SAXS, structural MS, EM, in vitro binding, co-IP) in a single rigorous study establishing direct interaction and structural disruption\",\n      \"pmids\": [\"35901867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DPCD functions as an adaptor of the R2TP chaperone complex (RUVBL1, RUVBL2, RPAP3, PIH1D1) and regulates ciliogenesis initiation through interaction with Akt kinase, modulating Akt phosphorylation levels rather than its stability. DPCD is a heart-shaped monomeric protein with two domains; a highly conserved CS (CHORD- and SGT1-containing) domain in DPCD interacts with the RUVBL2 DII domain with high affinity to form a stable R2TP-DPCD complex both in cellulo and in vitro. RUVBL1/2 are proposed to be CS-domain-binding proteins.\",\n      \"method\": \"Proximity-labeling mass spectrometry, co-immunoprecipitation, in vitro binding assays, Akt phosphorylation assays, loss-of-function ciliogenesis assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — proximity-labeling MS, reciprocal co-IP, in vitro binding, mutagenesis-level domain mapping, functional ciliogenesis readout, and kinase phosphorylation assay in one study with multiple orthogonal methods\",\n      \"pmids\": [\"38306274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Dpcd-/- mice, ependymal cilia show decreased amplitude, abnormal waveforms, and low cerebrospinal fluid flow velocity. The amount of dynein axonemal heavy chains in some inner dynein arms (IDAs) is decreased in ependymal cilia of Dpcd-/- mice, indicating that DPCD is required for proper IDA assembly. In wild-type mice, DPCD localizes to both the cytoplasm and cilia of ependymal cells.\",\n      \"method\": \"Knockout mouse analysis, high-speed video microscopy of ciliary motility, immunofluorescence/immunohistochemistry for dynein heavy chain quantification, subcellular localization by imaging\",\n      \"journal\": \"Cytoskeleton (Hoboken, N.J.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with direct functional readouts (motility, CSF flow), protein localization, and axonemal component quantification in a single study\",\n      \"pmids\": [\"40719343\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DPCD is a CS-domain-containing adaptor protein that associates with the R2TP chaperone complex (via high-affinity interaction with the RUVBL2 DII domain) to regulate ciliogenesis initiation through modulation of Akt kinase phosphorylation; in motile cilia, DPCD localizes to the cytoplasm and ciliary compartment of ependymal cells and is required for proper inner dynein arm (IDA) assembly, such that its loss causes partial IDA defects, aberrant ciliary motility, impaired CSF flow, and downstream phenotypes of primary ciliary dyskinesia including hydrocephalus, situs inversus, sinusitis, and male infertility.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DPCD is a CS-domain adaptor protein required for motile cilia function and the determination of left-right asymmetry [#1, #4]. It associates with the R2TP chaperone complex (RUVBL1, RUVBL2, RPAP3, PIH1D1), binding the RUVBL2 DII domain through its highly conserved CS domain to form a stable R2TP-DPCD complex; binding to the RUVBL1/2 AAA-ATPases disrupts the dodecameric R1R2 assembly [#3, #4]. Through this adaptor role DPCD regulates ciliogenesis initiation by modulating Akt kinase phosphorylation rather than Akt stability [#4]. In motile cilia DPCD localizes to both the cytoplasm and the ciliary compartment of ependymal cells and is required for proper inner dynein arm assembly, with its loss reducing axonemal dynein heavy chain content, producing abnormal ciliary waveforms and reduced cerebrospinal fluid flow [#5]. Loss of DPCD in mice causes phenotypes characteristic of primary ciliary dyskinesia, including hydrocephalus, situs inversus, sinusitis, and male infertility [#1, #2].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established DPCD, rather than the adjacent POLL gene, as the ciliogenesis-relevant gene by showing its expression is induced during differentiation of ciliated airway epithelium.\",\n      \"evidence\": \"Northern analysis during ciliated-cell differentiation of human airway epithelial cells plus sequencing of DPCD in PCD patients\",\n      \"pmids\": [\"14630615\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No confirmed disease-causing DPCD mutation identified in PCD patients\",\n        \"Expression correlation does not define molecular function\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated that DPCD loss in mice produces the canonical motile-cilia disease spectrum, placing it functionally in the pathway for ciliary motility and laterality.\",\n      \"evidence\": \"Dpcd/Poll double-knockout mouse phenotyping with laterality, hydrocephalus, sinusitis and fertility readouts\",\n      \"pmids\": [\"20080492\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Double-knockout design confounds attribution to DPCD alone\",\n        \"Molecular basis of the ciliary defect not addressed\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Independently confirmed that DPCD-dependent hydrocephalus arises from dysfunctional motile cilia, reinforcing the cilia-centered pathogenesis.\",\n      \"evidence\": \"Dpcd knockout mouse phenotyping with histopathological analysis\",\n      \"pmids\": [\"21746835\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Does not identify the molecular target of DPCD within the cilium\",\n        \"Mechanism linking cilia dysfunction to hydrocephalus at molecular level unresolved\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined DPCD as a direct binding partner of the RUVBL1/RUVBL2 AAA-ATPases and showed it remodels their oligomeric state, providing the first molecular interaction for the protein.\",\n      \"evidence\": \"Co-IP, in vitro binding, SAXS, structural mass spectrometry, electron microscopy and 3D modeling\",\n      \"pmids\": [\"35901867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional consequence of R1R2 dodecamer disruption not established\",\n        \"Link between RUVBL binding and ciliary phenotype not yet shown\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Integrated DPCD into the R2TP chaperone complex as a CS-domain adaptor and connected it to ciliogenesis initiation via modulation of Akt phosphorylation.\",\n      \"evidence\": \"Proximity-labeling MS, reciprocal co-IP, in vitro binding, domain mapping, Akt phosphorylation assays and loss-of-function ciliogenesis assays\",\n      \"pmids\": [\"38306274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How R2TP-DPCD mechanistically alters Akt phosphorylation is undefined\",\n        \"Whether Akt regulation is the same mechanism operating in motile cilia is unclear\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Localized DPCD within ependymal cells and tied its loss to defective inner dynein arm assembly, providing a concrete axonemal mechanism for the ciliary motility defect.\",\n      \"evidence\": \"Dpcd-/- mouse analysis with high-speed video microscopy, dynein heavy chain immunoquantification and subcellular localization imaging\",\n      \"pmids\": [\"40719343\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Only some IDAs affected; basis of selectivity unknown\",\n        \"Mechanistic link between R2TP/Akt activity and IDA assembly not established\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DPCD's R2TP-adaptor and Akt-modulating activities mechanistically drive inner dynein arm assembly in motile cilia remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No unified mechanism connecting R2TP chaperone function to axonemal dynein assembly\",\n        \"No human disease-causing mutation confirmed\",\n        \"Structural detail of the R2TP-DPCD-dynein assembly pathway lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0030317\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [\"R2TP\"],\n    \"partners\": [\"RUVBL1\", \"RUVBL2\", \"RPAP3\", \"PIH1D1\", \"AKT1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}