{"gene":"IQCB1","run_date":"2026-06-10T01:55:23","timeline":{"discoveries":[{"year":2014,"finding":"NPHP5 contains two separate BBSome-binding sites and interacts with the BBSome to mediate its integrity; depletion of NPHP5 specifically causes dissociation of BBS2 and BBS5 from the BBSome and loss of their ciliary trafficking without compromising other subunits. CEP290, which directly binds NPHP5, additionally controls BBS8 integrity within the BBSome. Loss of NPHP5 or CEP290 selectively impairs delivery of BBSome cargos (smoothened, VPAC2, Rab8a) to cilia.","method":"siRNA depletion, co-immunoprecipitation, mapping of binding sites, immunofluorescence of ciliary BBSome subunits and cargos","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding-site mapping, multiple orthogonal methods (Co-IP, siRNA, cargo trafficking assays), replicated across multiple conditions in one rigorous study","pmids":["25552655"],"is_preprint":false},{"year":2008,"finding":"Nephrocystin-5 (NPHP5) physically interacts with the N-terminal domain of nephrocystin-6 (NPHP6/CEP290); the interacting region was mapped to amino acids 696–896 of NPHP6. Knockdown of NPHP5 in Xenopus caused neural tube closure defects that were phenocopied by expression of the nephrocystin-5-binding fragment of NPHP6 and rescued by co-expression of NPHP5, confirming functional in vivo interaction. Combined knockdown of zNPHP5 and zNPHP6 in zebrafish produced synergistic phenotypes.","method":"Co-immunoprecipitation with deletion mapping, Xenopus morpholino knockdown and rescue, zebrafish double knockdown","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding-site mapping plus in vivo rescue in Xenopus and genetic synergy in zebrafish across two model organisms","pmids":["18723859"],"is_preprint":false},{"year":2013,"finding":"NPHP5 is a centriolar/transition zone protein whose depletion inhibits an early step of ciliogenesis. NPHP5 interacts with both CEP290 and calmodulin (CaM): CEP290 binding is required for ciliogenesis, while CaM binding prevents NPHP5 self-aggregation. Disease-causing truncating mutations abolish CEP290 binding and centrosomal localization, compromising cilia formation. A modifier mutation disrupts CaM binding without affecting ciliogenesis.","method":"siRNA depletion, co-immunoprecipitation, domain mapping, immunofluorescence/localization, disease-mutation functional analysis, pharmacological rescue","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, mutagenesis, localization, KD phenotype, pharmacological rescue) in single rigorous study","pmids":["23446637"],"is_preprint":false},{"year":2017,"finding":"NPHP5 undergoes cell-cycle-dependent K63 ubiquitination by the E3 ligase BBS11/TRIM32, and K48/K63 ubiquitination by MARCH7/axotrophin. The deubiquitinase USP9X directly binds NPHP5 and is recruited to the centrosome by NPHP5 during G0/G1/S phase to protect NPHP5 from ubiquitination and favour cilia assembly. In G2/M, USP9X dissociates from the centrosome, allowing BBS11-mediated K63 ubiquitination of NPHP5, triggering its delocalization and cilia loss. USP9X depletion also allows centrosomal accumulation of MARCH7, which K48 ubiquitinates NPHP5 to trigger its proteasomal degradation.","method":"Co-immunoprecipitation, ubiquitination assays distinguishing K48/K63 linkages, siRNA depletion, cell-cycle synchronization, immunofluorescence","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, linkage-specific ubiquitination assays, cell-cycle synchronization, KD phenotype) in one rigorous study","pmids":["28498859"],"is_preprint":false},{"year":2016,"finding":"In Nphp5-knockout mice, basal bodies form but transition zones are aberrant (reduced diameter), and outer segment transmembrane proteins accumulate in the ER by postnatal day 6. NPHP5 is essential for photoreceptor outer segment formation but is dispensable for ciliogenesis in mouse embryonic fibroblasts and kidney function, indicating a cell-type-specific requirement.","method":"Germline Nphp5-knockout mouse (gene-trap), electroretinography, immunofluorescence with EGFP-CETN2, electron microscopy of transition zones, ER accumulation assay, kidney histology","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — constitutive KO with multiple orthogonal readouts (ERG, EM ultrastructure, IHC, histology) in single rigorous study","pmids":["27328943"],"is_preprint":false},{"year":2019,"finding":"NPHP5 is a novel sub-distal appendage (SDA) and basal foot (BF) component of the mother centriole/basal body. NPHP5 is specifically required for basal foot (BF) assembly during ciliogenesis but is dispensable for SDA assembly. NPHP5 cooperates with a subset of SDA/BF proteins in a defined hierarchical order to organize BF; loss of NPHP5 simultaneously inhibits BF assembly and primary ciliogenesis, phenotypes rescuable by manipulating BF assembly pathway components.","method":"siRNA depletion, immunofluorescence co-localization, epistasis by sequential depletion of BF/SDA components, rescue experiments","journal":"Cellular and molecular life sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis analysis with multiple BF/SDA proteins, localization, KD, and rescue experiments providing convergent mechanistic evidence","pmids":["31177295"],"is_preprint":false},{"year":2022,"finding":"Patient-derived iPSC-differentiated RPE and retinal organoids carrying NPHP5 mutations show aberrantly elongated ciliary axonemes, impaired photoreceptor outer segment development, and mislocalization of visual pigments to the cell soma. All patient-derived cells show reduced levels of CEP290 protein, suggesting NPHP5 loss impairs ciliary gating and cargo transport through destabilization of CEP290. AAV-mediated IQCB1 gene augmentation rescues these phenotypes.","method":"iPSC reprogramming, differentiation to RPE and retinal organoids, immunofluorescence, Western blot for CEP290 levels, AAV rescue","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived human cell models with multiple phenotypic readouts and rescue, single lab","pmids":["36084637"],"is_preprint":false},{"year":2020,"finding":"EPB41L5 forms a complex with IQCB1/NPHP5 and regulates its localization at the ciliary base. Overexpression of EPB41L5 reduces IQCB1 localization at the ciliary base, while EPB41L5 knockdown increases it. EPB41L5 also decreases IQCB1 interaction with CEP290. Genetic synergy between epb41l5 and iqcb1 was observed in zebrafish, and epb41l5-deficient embryos showed reduced cilia motility and left-right patterning defects.","method":"Co-immunoprecipitation, overexpression and knockdown immunofluorescence in mammalian cells, zebrafish genetic interaction/synergy, left-right patterning assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus localization experiments and in vivo genetic synergy in zebrafish, single lab","pmids":["32501287"],"is_preprint":false},{"year":2018,"finding":"CNNM4 physically interacts with IQCB1; a truncated CNNM4 protein starting at R605 significantly increases the interaction with IQCB1 and the rate of apoptosis.","method":"Co-immunoprecipitation, apoptosis assay with truncated CNNM4 construct","journal":"Molecular genetics and genomics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with limited follow-up, no mechanistic dissection of how this interaction affects IQCB1 function, single lab","pmids":["29322253"],"is_preprint":false},{"year":2016,"finding":"In the canine NPHP5-LCA model, rod and cone photoreceptors form a sensory cilium but develop and function abnormally; L/M cones are more severely affected than S-cones. Absence of outer segments in mutant cones indicates ciliary dysfunction. Genes expressed in rod (or both rod and cone) photoreceptors are significantly downregulated in mutants, while cone-only expressed genes are unchanged.","method":"Comparative phenotyping of canine NPHP5-mutant retinas, gene expression profiling, confocal microscopy","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — large animal model with morphological and transcriptomic analysis, but primarily phenotypic characterization with limited pathway mechanistic detail","pmids":["27506978"],"is_preprint":false}],"current_model":"NPHP5/IQCB1 is a transition zone and basal body protein that is required for ciliogenesis by binding CEP290 (a prerequisite for cilia formation) and mediating BBSome integrity and ciliary cargo delivery; its activity is regulated by cell-cycle-dependent ubiquitination (K63 by BBS11/TRIM32, K48 by MARCH7) counteracted by the deubiquitinase USP9X, and it also participates in basal foot assembly at the mother centriole, with calmodulin binding preventing its self-aggregation and EPB41L5 modulating its centrosomal localization."},"narrative":{"mechanistic_narrative":"IQCB1 (NPHP5) is a centriolar, transition-zone and basal-body protein required for ciliogenesis and for the selective delivery of signaling cargo to cilia [PMID:25552655, PMID:23446637]. Its central function is exerted through a direct interaction with CEP290, mapped to the CEP290 N-terminal region (aa 696–896), which is required for cilia formation; truncating disease mutations abolish CEP290 binding and centrosomal localization and block ciliogenesis [PMID:18723859, PMID:23446637]. NPHP5 carries two BBSome-binding sites and maintains BBSome integrity, with its loss selectively dissociating BBS2 and BBS5 and impairing ciliary trafficking of cargos such as smoothened, VPAC2 and Rab8a, while CEP290 governs BBS8 integrity [PMID:25552655]. NPHP5 also acts as a sub-distal appendage and basal foot component of the mother centriole, where it is specifically required for basal foot assembly during ciliogenesis [PMID:31177295]. Its abundance and localization are controlled by cell-cycle-dependent ubiquitination: BBS11/TRIM32 adds K63 chains and MARCH7 adds K48 chains, while the deubiquitinase USP9X is recruited to the centrosome by NPHP5 in G0/G1/S to protect it and favor cilia assembly [PMID:28498859]. Calmodulin binding prevents NPHP5 self-aggregation, and EPB41L5 modulates its ciliary-base localization and its interaction with CEP290 [PMID:23446637, PMID:32501287]. Loss of IQCB1 produces a cell-type-specific defect most severe in photoreceptors, where transition zones are malformed and outer-segment proteins fail to traffic, while some other ciliated tissues are spared [PMID:27328943, PMID:36084637].","teleology":[{"year":2008,"claim":"Established that NPHP5 acts within the nephrocystin network by physically engaging CEP290, defining a molecular partnership underlying ciliopathy phenotypes.","evidence":"Co-IP with deletion mapping plus morpholino knockdown/rescue in Xenopus and double knockdown in zebrafish","pmids":["18723859"],"confidence":"High","gaps":["Did not resolve where in ciliogenesis the NPHP5–CEP290 complex acts","No structural detail of the interaction interface"]},{"year":2013,"claim":"Defined NPHP5 as a transition-zone/centriolar protein acting at an early ciliogenesis step and separated its two interactions functionally — CEP290 binding drives cilia formation while calmodulin binding prevents self-aggregation.","evidence":"siRNA depletion, domain mapping, localization, disease-mutation analysis and pharmacological rescue","pmids":["23446637"],"confidence":"High","gaps":["Mechanism by which CEP290 binding promotes ciliogenesis not detailed","Role of self-aggregation control in vivo unresolved"]},{"year":2014,"claim":"Showed NPHP5 maintains BBSome integrity through two BBSome-binding sites and is required for ciliary cargo delivery, linking it directly to ciliary signaling output.","evidence":"siRNA depletion, Co-IP, binding-site mapping, immunofluorescence of ciliary BBSome subunits and cargos","pmids":["25552655"],"confidence":"High","gaps":["How NPHP5 mechanically stabilizes BBS2/BBS5 within the BBSome unknown","Whether cargo selectivity is direct or via BBSome remodeling not resolved"]},{"year":2016,"claim":"Demonstrated a cell-type-specific requirement: NPHP5 is essential for photoreceptor outer-segment formation and proper transition-zone architecture but dispensable for ciliogenesis in fibroblasts and kidney.","evidence":"Germline gene-trap Nphp5-knockout mouse with ERG, EM, IHC and kidney histology","pmids":["27328943"],"confidence":"High","gaps":["Molecular basis of tissue specificity unexplained","Why transition-zone diameter is reduced not mechanistically defined"]},{"year":2016,"claim":"Characterized photoreceptor pathology in a large-animal NPHP5-LCA model, showing sensory cilia form but outer segments fail, with rod-expressed transcripts selectively downregulated.","evidence":"Comparative phenotyping, gene expression profiling and confocal microscopy of canine NPHP5-mutant retinas","pmids":["27506978"],"confidence":"Medium","gaps":["Primarily descriptive, limited pathway-level mechanism","Cause of differential rod versus cone vulnerability unresolved"]},{"year":2017,"claim":"Revealed that NPHP5 levels and localization are gated through the cell cycle by opposing ubiquitination (TRIM32/BBS11 K63, MARCH7 K48) and USP9X-mediated deubiquitination, coupling ciliogenesis to cell-cycle state.","evidence":"Co-IP, linkage-specific ubiquitination assays, cell-cycle synchronization and siRNA depletion","pmids":["28498859"],"confidence":"High","gaps":["Signals controlling USP9X centrosomal dissociation in G2/M unknown","Whether ubiquitination directly modulates CEP290/BBSome binding not tested"]},{"year":2018,"claim":"Reported a physical interaction between CNNM4 and IQCB1 modulated by CNNM4 truncation and associated with apoptosis.","evidence":"Co-IP and apoptosis assay with a truncated CNNM4 construct","pmids":["29322253"],"confidence":"Low","gaps":["Single Co-IP without reciprocal or functional dissection of how the interaction affects IQCB1","No link to ciliary function established"]},{"year":2019,"claim":"Placed NPHP5 in the sub-distal appendage/basal foot of the mother centriole, identifying it as specifically required for basal foot assembly during ciliogenesis.","evidence":"siRNA depletion, co-localization, epistasis by sequential depletion of BF/SDA components and rescue","pmids":["31177295"],"confidence":"High","gaps":["How basal foot assembly couples to ciliogenesis mechanistically unclear","Direct partners within the BF hierarchy not all identified"]},{"year":2020,"claim":"Identified EPB41L5 as a regulator of IQCB1 ciliary-base localization and of its CEP290 interaction, adding an upstream modulator of the NPHP5–CEP290 axis.","evidence":"Co-IP, overexpression/knockdown localization in mammalian cells, and zebrafish genetic synergy with left-right patterning readout","pmids":["32501287"],"confidence":"Medium","gaps":["Mechanism by which EPB41L5 displaces IQCB1 not defined","Single-lab finding without reciprocal structural validation"]},{"year":2022,"claim":"Showed in patient-derived iPSC retinal models that IQCB1 mutations cause CEP290 destabilization, axoneme/outer-segment defects and visual-pigment mislocalization, all rescuable by AAV gene augmentation.","evidence":"Patient iPSC-derived RPE and retinal organoids with immunofluorescence, CEP290 Western blot and AAV rescue","pmids":["36084637"],"confidence":"Medium","gaps":["Whether CEP290 loss is cause or consequence of the gating defect not fully resolved","Single-lab human model system"]},{"year":null,"claim":"How NPHP5 integrates its multiple roles — CEP290 binding, BBSome cargo gating, basal foot assembly, and ubiquitin-regulated turnover — into a single coordinated ciliogenesis program, and what underlies its tissue-specific essentiality, remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No integrated structural model of the NPHP5–CEP290–BBSome assembly","Molecular basis of photoreceptor-selective requirement unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,2]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[2,4]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[2,3,5]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,2,5]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0]}],"complexes":["BBSome","basal foot","sub-distal appendage"],"partners":["CEP290","USP9X","TRIM32","MARCH7","EPB41L5","CALM1","CNNM4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15051","full_name":"IQ calmodulin-binding motif-containing protein 1","aliases":["Nephrocystin-5","p53 and DNA damage-regulated IQ motif protein","PIQ"],"length_aa":598,"mass_kda":68.9,"function":"Involved in ciliogenesis. The function in an early step in cilia formation depends on its association with CEP290/NPHP6 (PubMed:21565611, PubMed:23446637). Involved in regulation of the BBSome complex integrity, specifically for presence of BBS2 and BBS5 in the complex, and in ciliary targeting of selected BBSome cargos. May play a role in controlling entry of the BBSome complex to cilia possibly implicating CEP290/NPHP6 (PubMed:25552655)","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole","url":"https://www.uniprot.org/uniprotkb/Q15051/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/IQCB1","classification":"Not Classified","n_dependent_lines":31,"n_total_lines":1208,"dependency_fraction":0.02566225165562914},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CALM1","stoichiometry":0.2},{"gene":"CALM2","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/IQCB1","total_profiled":1310},"omim":[{"mim_id":"610142","title":"CENTROSOMAL PROTEIN, 290-KD; CEP290","url":"https://www.omim.org/entry/610142"},{"mim_id":"609254","title":"SENIOR-LOKEN SYNDROME 5; SLSN5","url":"https://www.omim.org/entry/609254"},{"mim_id":"609237","title":"IQ MOTIF-CONTAINING PROTEIN B1; IQCB1","url":"https://www.omim.org/entry/609237"},{"mim_id":"606844","title":"ALMS1 CENTROSOME AND BASAL BODY ASSOCIATED PROTEIN; ALMS1","url":"https://www.omim.org/entry/606844"},{"mim_id":"600053","title":"CYCLIC NUCLEOTIDE-GATED CHANNEL, ALPHA-3; CNGA3","url":"https://www.omim.org/entry/600053"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Microtubules","reliability":"Uncertain"},{"location":"Cytokinetic bridge","reliability":"Uncertain"},{"location":"Mitotic spindle","reliability":"Uncertain"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/IQCB1"},"hgnc":{"alias_symbol":["KIAA0036","NPHP5","SLSN5"],"prev_symbol":[]},"alphafold":{"accession":"Q15051","domains":[{"cath_id":"1.25.10.10","chopping":"9-286","consensus_level":"medium","plddt":85.0168,"start":9,"end":286}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15051","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15051-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15051-F1-predicted_aligned_error_v6.png","plddt_mean":82.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=IQCB1","jax_strain_url":"https://www.jax.org/strain/search?query=IQCB1"},"sequence":{"accession":"Q15051","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15051.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15051/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15051"}},"corpus_meta":[{"pmid":"21245082","id":"PMC_21245082","title":"Cone photoreceptors are the main targets for gene therapy of NPHP5 (IQCB1) or NPHP6 (CEP290) blindness: generation of an all-cone Nphp6 hypomorph mouse that mimics the human retinal ciliopathy.","date":"2011","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21245082","citation_count":102,"is_preprint":false},{"pmid":"20881296","id":"PMC_20881296","title":"IQCB1 mutations in patients with leber congenital amaurosis.","date":"2011","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/20881296","citation_count":96,"is_preprint":false},{"pmid":"25552655","id":"PMC_25552655","title":"Nephrocystin proteins NPHP5 and Cep290 regulate BBSome integrity, ciliary trafficking and cargo delivery.","date":"2014","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25552655","citation_count":75,"is_preprint":false},{"pmid":"18723859","id":"PMC_18723859","title":"Genetic and physical interaction between the NPHP5 and 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insertion in IQCB1 as causative variant for Senior-Løken syndrome.","date":"2025","source":"NPJ genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40263280","citation_count":1,"is_preprint":false},{"pmid":"41316455","id":"PMC_41316455","title":"Senior-Løken syndrome with IQCB1/NPHP5 mutation in an adult: a case report.","date":"2025","source":"Journal of medical case reports","url":"https://pubmed.ncbi.nlm.nih.gov/41316455","citation_count":0,"is_preprint":false},{"pmid":"40331022","id":"PMC_40331022","title":"A Novel NPHP5 Gene Mutation in Three Siblings With Nephronophthisis Without Retinitis Pigmentosa: A Case Report.","date":"2025","source":"Case reports in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/40331022","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.01.15.633139","title":"Evaluation of Prostaglandin Receptor Agonists and Eupatilin in the Context of Nephronophthisis","date":"2025-01-15","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.15.633139","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14949,"output_tokens":2980,"usd":0.044774,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10267,"output_tokens":3435,"usd":0.068605,"stage2_stop_reason":"end_turn"},"total_usd":0.113379,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2014,\n      \"finding\": \"NPHP5 contains two separate BBSome-binding sites and interacts with the BBSome to mediate its integrity; depletion of NPHP5 specifically causes dissociation of BBS2 and BBS5 from the BBSome and loss of their ciliary trafficking without compromising other subunits. CEP290, which directly binds NPHP5, additionally controls BBS8 integrity within the BBSome. Loss of NPHP5 or CEP290 selectively impairs delivery of BBSome cargos (smoothened, VPAC2, Rab8a) to cilia.\",\n      \"method\": \"siRNA depletion, co-immunoprecipitation, mapping of binding sites, immunofluorescence of ciliary BBSome subunits and cargos\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding-site mapping, multiple orthogonal methods (Co-IP, siRNA, cargo trafficking assays), replicated across multiple conditions in one rigorous study\",\n      \"pmids\": [\"25552655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nephrocystin-5 (NPHP5) physically interacts with the N-terminal domain of nephrocystin-6 (NPHP6/CEP290); the interacting region was mapped to amino acids 696–896 of NPHP6. Knockdown of NPHP5 in Xenopus caused neural tube closure defects that were phenocopied by expression of the nephrocystin-5-binding fragment of NPHP6 and rescued by co-expression of NPHP5, confirming functional in vivo interaction. Combined knockdown of zNPHP5 and zNPHP6 in zebrafish produced synergistic phenotypes.\",\n      \"method\": \"Co-immunoprecipitation with deletion mapping, Xenopus morpholino knockdown and rescue, zebrafish double knockdown\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding-site mapping plus in vivo rescue in Xenopus and genetic synergy in zebrafish across two model organisms\",\n      \"pmids\": [\"18723859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NPHP5 is a centriolar/transition zone protein whose depletion inhibits an early step of ciliogenesis. NPHP5 interacts with both CEP290 and calmodulin (CaM): CEP290 binding is required for ciliogenesis, while CaM binding prevents NPHP5 self-aggregation. Disease-causing truncating mutations abolish CEP290 binding and centrosomal localization, compromising cilia formation. A modifier mutation disrupts CaM binding without affecting ciliogenesis.\",\n      \"method\": \"siRNA depletion, co-immunoprecipitation, domain mapping, immunofluorescence/localization, disease-mutation functional analysis, pharmacological rescue\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, mutagenesis, localization, KD phenotype, pharmacological rescue) in single rigorous study\",\n      \"pmids\": [\"23446637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NPHP5 undergoes cell-cycle-dependent K63 ubiquitination by the E3 ligase BBS11/TRIM32, and K48/K63 ubiquitination by MARCH7/axotrophin. The deubiquitinase USP9X directly binds NPHP5 and is recruited to the centrosome by NPHP5 during G0/G1/S phase to protect NPHP5 from ubiquitination and favour cilia assembly. In G2/M, USP9X dissociates from the centrosome, allowing BBS11-mediated K63 ubiquitination of NPHP5, triggering its delocalization and cilia loss. USP9X depletion also allows centrosomal accumulation of MARCH7, which K48 ubiquitinates NPHP5 to trigger its proteasomal degradation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays distinguishing K48/K63 linkages, siRNA depletion, cell-cycle synchronization, immunofluorescence\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, linkage-specific ubiquitination assays, cell-cycle synchronization, KD phenotype) in one rigorous study\",\n      \"pmids\": [\"28498859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In Nphp5-knockout mice, basal bodies form but transition zones are aberrant (reduced diameter), and outer segment transmembrane proteins accumulate in the ER by postnatal day 6. NPHP5 is essential for photoreceptor outer segment formation but is dispensable for ciliogenesis in mouse embryonic fibroblasts and kidney function, indicating a cell-type-specific requirement.\",\n      \"method\": \"Germline Nphp5-knockout mouse (gene-trap), electroretinography, immunofluorescence with EGFP-CETN2, electron microscopy of transition zones, ER accumulation assay, kidney histology\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — constitutive KO with multiple orthogonal readouts (ERG, EM ultrastructure, IHC, histology) in single rigorous study\",\n      \"pmids\": [\"27328943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NPHP5 is a novel sub-distal appendage (SDA) and basal foot (BF) component of the mother centriole/basal body. NPHP5 is specifically required for basal foot (BF) assembly during ciliogenesis but is dispensable for SDA assembly. NPHP5 cooperates with a subset of SDA/BF proteins in a defined hierarchical order to organize BF; loss of NPHP5 simultaneously inhibits BF assembly and primary ciliogenesis, phenotypes rescuable by manipulating BF assembly pathway components.\",\n      \"method\": \"siRNA depletion, immunofluorescence co-localization, epistasis by sequential depletion of BF/SDA components, rescue experiments\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis analysis with multiple BF/SDA proteins, localization, KD, and rescue experiments providing convergent mechanistic evidence\",\n      \"pmids\": [\"31177295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Patient-derived iPSC-differentiated RPE and retinal organoids carrying NPHP5 mutations show aberrantly elongated ciliary axonemes, impaired photoreceptor outer segment development, and mislocalization of visual pigments to the cell soma. All patient-derived cells show reduced levels of CEP290 protein, suggesting NPHP5 loss impairs ciliary gating and cargo transport through destabilization of CEP290. AAV-mediated IQCB1 gene augmentation rescues these phenotypes.\",\n      \"method\": \"iPSC reprogramming, differentiation to RPE and retinal organoids, immunofluorescence, Western blot for CEP290 levels, AAV rescue\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived human cell models with multiple phenotypic readouts and rescue, single lab\",\n      \"pmids\": [\"36084637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EPB41L5 forms a complex with IQCB1/NPHP5 and regulates its localization at the ciliary base. Overexpression of EPB41L5 reduces IQCB1 localization at the ciliary base, while EPB41L5 knockdown increases it. EPB41L5 also decreases IQCB1 interaction with CEP290. Genetic synergy between epb41l5 and iqcb1 was observed in zebrafish, and epb41l5-deficient embryos showed reduced cilia motility and left-right patterning defects.\",\n      \"method\": \"Co-immunoprecipitation, overexpression and knockdown immunofluorescence in mammalian cells, zebrafish genetic interaction/synergy, left-right patterning assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus localization experiments and in vivo genetic synergy in zebrafish, single lab\",\n      \"pmids\": [\"32501287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CNNM4 physically interacts with IQCB1; a truncated CNNM4 protein starting at R605 significantly increases the interaction with IQCB1 and the rate of apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, apoptosis assay with truncated CNNM4 construct\",\n      \"journal\": \"Molecular genetics and genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with limited follow-up, no mechanistic dissection of how this interaction affects IQCB1 function, single lab\",\n      \"pmids\": [\"29322253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In the canine NPHP5-LCA model, rod and cone photoreceptors form a sensory cilium but develop and function abnormally; L/M cones are more severely affected than S-cones. Absence of outer segments in mutant cones indicates ciliary dysfunction. Genes expressed in rod (or both rod and cone) photoreceptors are significantly downregulated in mutants, while cone-only expressed genes are unchanged.\",\n      \"method\": \"Comparative phenotyping of canine NPHP5-mutant retinas, gene expression profiling, confocal microscopy\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — large animal model with morphological and transcriptomic analysis, but primarily phenotypic characterization with limited pathway mechanistic detail\",\n      \"pmids\": [\"27506978\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NPHP5/IQCB1 is a transition zone and basal body protein that is required for ciliogenesis by binding CEP290 (a prerequisite for cilia formation) and mediating BBSome integrity and ciliary cargo delivery; its activity is regulated by cell-cycle-dependent ubiquitination (K63 by BBS11/TRIM32, K48 by MARCH7) counteracted by the deubiquitinase USP9X, and it also participates in basal foot assembly at the mother centriole, with calmodulin binding preventing its self-aggregation and EPB41L5 modulating its centrosomal localization.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"IQCB1 (NPHP5) is a centriolar, transition-zone and basal-body protein required for ciliogenesis and for the selective delivery of signaling cargo to cilia [#0, #2]. Its central function is exerted through a direct interaction with CEP290, mapped to the CEP290 N-terminal region (aa 696–896), which is required for cilia formation; truncating disease mutations abolish CEP290 binding and centrosomal localization and block ciliogenesis [#1, #2]. NPHP5 carries two BBSome-binding sites and maintains BBSome integrity, with its loss selectively dissociating BBS2 and BBS5 and impairing ciliary trafficking of cargos such as smoothened, VPAC2 and Rab8a, while CEP290 governs BBS8 integrity [#0]. NPHP5 also acts as a sub-distal appendage and basal foot component of the mother centriole, where it is specifically required for basal foot assembly during ciliogenesis [#5]. Its abundance and localization are controlled by cell-cycle-dependent ubiquitination: BBS11/TRIM32 adds K63 chains and MARCH7 adds K48 chains, while the deubiquitinase USP9X is recruited to the centrosome by NPHP5 in G0/G1/S to protect it and favor cilia assembly [#3]. Calmodulin binding prevents NPHP5 self-aggregation, and EPB41L5 modulates its ciliary-base localization and its interaction with CEP290 [#2, #7]. Loss of IQCB1 produces a cell-type-specific defect most severe in photoreceptors, where transition zones are malformed and outer-segment proteins fail to traffic, while some other ciliated tissues are spared [#4, #6].\"\n  ,\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established that NPHP5 acts within the nephrocystin network by physically engaging CEP290, defining a molecular partnership underlying ciliopathy phenotypes.\",\n      \"evidence\": \"Co-IP with deletion mapping plus morpholino knockdown/rescue in Xenopus and double knockdown in zebrafish\",\n      \"pmids\": [\"18723859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve where in ciliogenesis the NPHP5–CEP290 complex acts\", \"No structural detail of the interaction interface\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined NPHP5 as a transition-zone/centriolar protein acting at an early ciliogenesis step and separated its two interactions functionally — CEP290 binding drives cilia formation while calmodulin binding prevents self-aggregation.\",\n      \"evidence\": \"siRNA depletion, domain mapping, localization, disease-mutation analysis and pharmacological rescue\",\n      \"pmids\": [\"23446637\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CEP290 binding promotes ciliogenesis not detailed\", \"Role of self-aggregation control in vivo unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed NPHP5 maintains BBSome integrity through two BBSome-binding sites and is required for ciliary cargo delivery, linking it directly to ciliary signaling output.\",\n      \"evidence\": \"siRNA depletion, Co-IP, binding-site mapping, immunofluorescence of ciliary BBSome subunits and cargos\",\n      \"pmids\": [\"25552655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NPHP5 mechanically stabilizes BBS2/BBS5 within the BBSome unknown\", \"Whether cargo selectivity is direct or via BBSome remodeling not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated a cell-type-specific requirement: NPHP5 is essential for photoreceptor outer-segment formation and proper transition-zone architecture but dispensable for ciliogenesis in fibroblasts and kidney.\",\n      \"evidence\": \"Germline gene-trap Nphp5-knockout mouse with ERG, EM, IHC and kidney histology\",\n      \"pmids\": [\"27328943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of tissue specificity unexplained\", \"Why transition-zone diameter is reduced not mechanistically defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Characterized photoreceptor pathology in a large-animal NPHP5-LCA model, showing sensory cilia form but outer segments fail, with rod-expressed transcripts selectively downregulated.\",\n      \"evidence\": \"Comparative phenotyping, gene expression profiling and confocal microscopy of canine NPHP5-mutant retinas\",\n      \"pmids\": [\"27506978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Primarily descriptive, limited pathway-level mechanism\", \"Cause of differential rod versus cone vulnerability unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed that NPHP5 levels and localization are gated through the cell cycle by opposing ubiquitination (TRIM32/BBS11 K63, MARCH7 K48) and USP9X-mediated deubiquitination, coupling ciliogenesis to cell-cycle state.\",\n      \"evidence\": \"Co-IP, linkage-specific ubiquitination assays, cell-cycle synchronization and siRNA depletion\",\n      \"pmids\": [\"28498859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals controlling USP9X centrosomal dissociation in G2/M unknown\", \"Whether ubiquitination directly modulates CEP290/BBSome binding not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reported a physical interaction between CNNM4 and IQCB1 modulated by CNNM4 truncation and associated with apoptosis.\",\n      \"evidence\": \"Co-IP and apoptosis assay with a truncated CNNM4 construct\",\n      \"pmids\": [\"29322253\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single Co-IP without reciprocal or functional dissection of how the interaction affects IQCB1\", \"No link to ciliary function established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed NPHP5 in the sub-distal appendage/basal foot of the mother centriole, identifying it as specifically required for basal foot assembly during ciliogenesis.\",\n      \"evidence\": \"siRNA depletion, co-localization, epistasis by sequential depletion of BF/SDA components and rescue\",\n      \"pmids\": [\"31177295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How basal foot assembly couples to ciliogenesis mechanistically unclear\", \"Direct partners within the BF hierarchy not all identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified EPB41L5 as a regulator of IQCB1 ciliary-base localization and of its CEP290 interaction, adding an upstream modulator of the NPHP5–CEP290 axis.\",\n      \"evidence\": \"Co-IP, overexpression/knockdown localization in mammalian cells, and zebrafish genetic synergy with left-right patterning readout\",\n      \"pmids\": [\"32501287\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which EPB41L5 displaces IQCB1 not defined\", \"Single-lab finding without reciprocal structural validation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed in patient-derived iPSC retinal models that IQCB1 mutations cause CEP290 destabilization, axoneme/outer-segment defects and visual-pigment mislocalization, all rescuable by AAV gene augmentation.\",\n      \"evidence\": \"Patient iPSC-derived RPE and retinal organoids with immunofluorescence, CEP290 Western blot and AAV rescue\",\n      \"pmids\": [\"36084637\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CEP290 loss is cause or consequence of the gating defect not fully resolved\", \"Single-lab human model system\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NPHP5 integrates its multiple roles — CEP290 binding, BBSome cargo gating, basal foot assembly, and ubiquitin-regulated turnover — into a single coordinated ciliogenesis program, and what underlies its tissue-specific essentiality, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No integrated structural model of the NPHP5–CEP290–BBSome assembly\", \"Molecular basis of photoreceptor-selective requirement unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [2, 3, 5]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"BBSome\", \"basal foot\", \"sub-distal appendage\"],\n    \"partners\": [\"CEP290\", \"USP9X\", \"TRIM32\", \"MARCH7\", \"EPB41L5\", \"CALM1\", \"CNNM4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}