{"gene":"WDR19","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2006,"finding":"C. elegans DYF-2 (ortholog of human WDR19) is a component of the IFT machinery in sensory cilia; loss of DYF-2 selectively affects assembly and motility of IFT complex components and leads to defects in cilia structure and chemosensation. DYF-2 associates with IFT particle complex B, and mutations in dyf-2 interfere with complex A component function, indicating a role in assembly of the IFT particle as a whole. Mouse WDR19 also localizes to cilia, confirming evolutionary conservation.","method":"Transgenic rescue of mutant phenotypes, sequencing of mutant alleles, fluorescence imaging of IFT component movement in Bardet-Biedl syndrome mutant background, live imaging of DYF-2 movement in cilia","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal genetic epistasis, rescue experiments, and direct localization with functional consequence; replicated in two organisms","pmids":["16957054"],"is_preprint":false},{"year":2011,"finding":"WDR19 encodes IFT144, a member of the IFT complex A that drives retrograde ciliary transport. Fibroblasts from Sensenbrenner syndrome patients show absence of IFT144 from cilia and perturbed ciliary abundance and morphology, directly demonstrating the ciliary pathogenesis of WDR19 mutations.","method":"Exome sequencing of patient families combined with immunofluorescence of patient fibroblasts showing IFT144 absence from cilia and perturbed ciliary morphology","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiment with functional consequence in patient-derived cells, replicated across multiple families; foundational paper with 189 citations","pmids":["22019273"],"is_preprint":false},{"year":2003,"finding":"WDR19 encodes a WD-repeat protein with six WD repeats, a clathrin heavy-chain repeat, and three transmembrane domains, and is regulated by androgenic hormones in prostate epithelium. The gene comprises 36 exons on chromosome 4p15-4p11 and exhibits alternative splicing producing prostate-restricted isoforms.","method":"cDNA isolation, sequence analysis, RNA in situ hybridization, androgen regulation assays in prostate tissue","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — direct characterization of gene structure and androgen regulation; single lab but multiple methods","pmids":["12906858"],"is_preprint":false},{"year":2020,"finding":"WDR19 localizes to sperm neck and flagella, and a homozygous WDR19 mutation (p.K1271E) causes its absence from these structures, resulting in complete destruction of sperm flagella ultrastructure (MMAF). IFT140 and IFT88, predicted direct interactors of WDR19, are mis-allocated in WDR19-mutated sperm, demonstrating WDR19's role in coordinating IFT complex localization within flagella.","method":"Immunofluorescence of patient sperm, scanning and transmission electron microscopy of sperm ultrastructure, whole exome sequencing","journal":"Journal of assisted reproduction and genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization with functional consequence and downstream partner mislocalization shown in patient cells; single lab","pmids":["32323121"],"is_preprint":false},{"year":2021,"finding":"IFT144/WDR19 compound heterozygous mutations (missense L710S and nonsense R1103*) cause distinct molecular defects: L710S is hypomorphic and rescues ciliogenesis defects when expressed in IFT144-KO cells, while R1103* exacerbates ciliogenesis defects. The two variants differ in their interactions with other IFT-A subunits and with the IFT-B complex. Coexpression of R1103* with hypomorphic L710S in IFT144-KO cells mimics the severe compound heterozygous CED patient phenotype.","method":"IFT144-knockout cell generation, exogenous expression of variant constructs in KO cells, ciliogenesis rescue assays, co-immunoprecipitation to assess interactions with IFT-A subunits and IFT-B complex","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 — KO complementation with mutagenesis, protein interaction assays, and defined cellular phenotypic readouts in a single rigorous study","pmids":["33517396"],"is_preprint":false},{"year":2015,"finding":"Mutant WDR19 protein in kidney tubular epithelium shows altered subcellular localization: control kidneys display localized expression along the luminal borders of renal tubular epithelium, whereas in NPHP13 patients the protein shows diffuse cytoplasmic staining, indicating mislocalization of mutant WDR19 away from the ciliary/apical membrane compartment.","method":"Immunohistochemistry on renal biopsy tissue from patients vs. controls","journal":"Pediatric nephrology (Berlin, Germany)","confidence":"Medium","confidence_rationale":"Tier 3 — direct localization experiment in patient tissue with functional implication; single lab, single method","pmids":["25726036"],"is_preprint":false},{"year":2020,"finding":"A synonymous variant in bovine WDR19 activates a cryptic exonic splice site that eliminates three evolutionarily conserved amino acids, decreasing WDR19 protein expression and compromising semen quality and male fertility, consistent with WDR19's role in IFT complex function in motile cilia and flagella.","method":"Genome-wide association testing, whole-genome sequencing, bioinformatic splice site analysis, transcription analysis of cryptic splicing, Western blot of protein expression","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (transcription analysis + Western blot + genetic association) in a bovine ortholog study; single lab","pmids":["32407316"],"is_preprint":false},{"year":2025,"finding":"A hypomorphic WDR19 missense variant (p.Cys293Tyr) impairs nephron development in kidney organoids, causing delayed differentiation, cystogenesis, and structural abnormalities in tubular and glomerular structures. Mutant organoids display reduced ciliation and shortened cilia. Both hypomorphic and loss-of-function variants cause Sonic hedgehog pathway dysregulation, with upregulation associated with reduced ciliation and significant downregulation of FGF8, suggesting an inverse relationship between Shh and FGF8 pathways during kidney organoid development.","method":"CRISPR-Cas9 knock-in of patient variants in hESCs, patient-derived iPSC kidney organoids, immunofluorescence, electron microscopy, RNA-sequencing and pathway analysis","journal":"Kidney international reports","confidence":"High","confidence_rationale":"Tier 1-2 — reconstitution in organoid model with multiple orthogonal methods (EM, IF, RNA-seq) and CRISPR-engineered patient variants; single lab but rigorous","pmids":["41141533"],"is_preprint":false}],"current_model":"WDR19 encodes IFT144, a core subunit of the IFT-A complex that drives retrograde intraflagellar transport; it localizes to cilia and flagella where it is required for IFT particle assembly and integrity, coordinates the localization of partner IFT-A and IFT-B subunits, and its loss or mislocalization disrupts ciliogenesis, ciliary protein trafficking, and downstream hedgehog signaling, causing a spectrum of ciliopathies affecting the kidney, retina, skeleton, and male fertility."},"narrative":{"teleology":[{"year":2003,"claim":"Before its ciliary role was known, WDR19 was characterized as a WD-repeat protein with domain architecture including clathrin heavy-chain repeats and transmembrane domains, establishing its structural framework and revealing androgen-regulated expression in prostate epithelium.","evidence":"cDNA cloning, sequence analysis, RNA in situ hybridization, and androgen regulation assays in prostate tissue","pmids":["12906858"],"confidence":"Medium","gaps":["Androgen regulation has not been linked to ciliary function","Prostate-specific isoform functions remain uncharacterized","Predicted transmembrane domains have not been experimentally validated"]},{"year":2006,"claim":"Identification of C. elegans DYF-2 as a WDR19 ortholog revealed that the gene encodes an IFT machinery component: loss of DYF-2 disrupted IFT particle assembly, ciliary structure, and chemosensation, and mouse WDR19 localized to cilia, establishing an evolutionarily conserved role in intraflagellar transport.","evidence":"Transgenic rescue of C. elegans mutants, live imaging of IFT component movement in cilia, fluorescence localization in mouse","pmids":["16957054"],"confidence":"High","gaps":["Precise position of IFT144 within the IFT-A complex architecture was unknown","No human disease link had been established","Retrograde vs. anterograde transport contribution was not fully dissected"]},{"year":2011,"claim":"Exome sequencing of Sensenbrenner syndrome families established that WDR19 mutations cause human ciliopathy, and patient fibroblasts showed absence of IFT144 from cilia with perturbed ciliary morphology, directly linking WDR19 loss-of-function to defective ciliogenesis in disease.","evidence":"Exome sequencing of multiple patient families, immunofluorescence of patient fibroblasts","pmids":["22019273"],"confidence":"High","gaps":["Genotype-phenotype correlations across the ciliopathy spectrum were not delineated","Molecular mechanism by which specific mutations disrupt IFT-A assembly was unknown"]},{"year":2015,"claim":"Immunohistochemistry of NPHP13 patient kidneys showed that mutant WDR19 mislocalizes from the luminal/apical membrane to diffuse cytoplasm in renal tubular epithelium, demonstrating that pathogenic variants impair protein targeting to the ciliary compartment in disease-relevant tissue.","evidence":"Immunohistochemistry on renal biopsies from patients vs. controls","pmids":["25726036"],"confidence":"Medium","gaps":["Single method (IHC) without complementary biochemical confirmation","Whether mislocalization is cause or consequence of ciliary loss was not resolved","Mechanism of apical targeting was not identified"]},{"year":2020,"claim":"Two parallel studies extended WDR19 function to motile flagella and male fertility: human WDR19 mutation caused complete destruction of sperm flagellar ultrastructure with mislocalization of IFT140 and IFT88, while a bovine synonymous variant activated cryptic splicing that reduced WDR19 protein and impaired semen quality, establishing WDR19 as essential for flagellar assembly across species.","evidence":"Immunofluorescence and electron microscopy of patient sperm (human); GWAS, whole-genome sequencing, splice analysis, and Western blot (bovine)","pmids":["32323121","32407316"],"confidence":"Medium","gaps":["Structural basis for IFT144 interaction with IFT140 and IFT88 remains unresolved","Whether WDR19 has flagella-specific functions beyond canonical IFT-A is unknown"]},{"year":2021,"claim":"Knockout-rescue experiments demonstrated that distinct WDR19 mutations have quantitatively different effects on IFT-A and IFT-B complex interactions: a hypomorphic missense (L710S) rescued ciliogenesis while a truncating variant (R1103*) exacerbated defects, and their coexpression reconstituted the severe compound heterozygous patient phenotype, establishing an allelic mechanism for phenotypic severity.","evidence":"CRISPR IFT144-KO cells, exogenous variant expression, ciliogenesis rescue assays, co-immunoprecipitation","pmids":["33517396"],"confidence":"High","gaps":["Structural basis for differential interaction defects of missense vs. truncation variants is unknown","In vivo validation of the compound heterozygote model was not performed"]},{"year":2025,"claim":"Kidney organoid modeling revealed that hypomorphic WDR19 variants impair nephron development by reducing ciliation and dysregulating Sonic hedgehog signaling, with an inverse relationship between Shh upregulation and FGF8 downregulation, providing a mechanistic link from IFT defects through Shh to developmental kidney pathology.","evidence":"CRISPR knock-in of patient variants in hESCs, iPSC-derived kidney organoids, electron microscopy, immunofluorescence, RNA-sequencing","pmids":["41141533"],"confidence":"High","gaps":["Whether Shh-FGF8 axis dysregulation occurs in vivo in patient kidneys is not established","Direct versus indirect effects on hedgehog signaling components have not been dissected","Role of WDR19 in glomerular vs. tubular pathology needs further delineation"]},{"year":null,"claim":"High-resolution structural data for IFT144 within the assembled IFT-A complex are lacking, and the precise biochemical contributions of individual WD-repeat and clathrin-heavy-chain-repeat domains to IFT-A subunit interactions, cargo recognition, and retrograde motor coupling remain undefined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No atomic-resolution structure of IFT144 in the IFT-A context","Cargo specificity of IFT144 is unknown","Relationship between androgen regulation and ciliary function is entirely unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,4]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,3,5]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,4,7]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[7]}],"complexes":["IFT-A complex"],"partners":["IFT140","IFT88"],"other_free_text":[]},"mechanistic_narrative":"WDR19 encodes IFT144, a WD-repeat protein that serves as a core subunit of the intraflagellar transport complex A (IFT-A), essential for retrograde ciliary transport, ciliogenesis, and ciliary protein trafficking in both primary and motile cilia [PMID:16957054, PMID:22019273]. IFT144 localizes to cilia and flagella and coordinates the assembly and localization of other IFT-A and IFT-B subunits; its loss causes mislocalization of partner proteins IFT140 and IFT88 and destruction of flagellar ultrastructure [PMID:32323121, PMID:33517396]. WDR19 mutations disrupt Sonic hedgehog signaling and FGF8 pathway regulation downstream of impaired ciliation, leading to nephron developmental defects including cystogenesis [PMID:41141533]. Biallelic WDR19 mutations cause a spectrum of ciliopathies including Sensenbrenner syndrome (cranioectodermal dysplasia), nephronophthisis (NPHP13), retinal dystrophy, and male infertility due to multiple morphological abnormalities of the flagella [PMID:22019273, PMID:25726036, PMID:32323121]."},"prefetch_data":{"uniprot":{"accession":"Q8NEZ3","full_name":"WD repeat-containing protein 19","aliases":["Intraflagellar transport 144 homolog"],"length_aa":1342,"mass_kda":151.6,"function":"As component of the IFT complex A (IFT-A), a complex required for retrograde ciliary transport and entry into cilia of G protein-coupled receptors (GPCRs), it is involved in cilia function and/or assembly (PubMed:20889716). Essential for functional IFT-A assembly and ciliary entry of GPCRs (PubMed:20889716). Associates with the BBSome complex to mediate ciliary transport (By similarity)","subcellular_location":"Cell projection, cilium; Cytoplasm, cytoskeleton, cilium basal body; Cell projection, cilium, photoreceptor outer segment; Cell projection, cilium, flagellum","url":"https://www.uniprot.org/uniprotkb/Q8NEZ3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WDR19","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/WDR19","total_profiled":1310},"omim":[{"mim_id":"619867","title":"SPERMATOGENIC FAILURE 72; SPGF72","url":"https://www.omim.org/entry/619867"},{"mim_id":"616307","title":"SENIOR-LOKEN SYNDROME 8; SLSN8","url":"https://www.omim.org/entry/616307"},{"mim_id":"615462","title":"DYNEIN, CYTOPLASMIC 2, INTERMEDIATE CHAIN 1; DYNC2I1","url":"https://www.omim.org/entry/615462"},{"mim_id":"614378","title":"CRANIOECTODERMAL DYSPLASIA 4; CED4","url":"https://www.omim.org/entry/614378"},{"mim_id":"614377","title":"NEPHRONOPHTHISIS 13; NPHP13","url":"https://www.omim.org/entry/614377"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Nucleoplasm","reliability":"Uncertain"},{"location":"Mid piece","reliability":"Uncertain"},{"location":"Centrosome","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/WDR19"},"hgnc":{"alias_symbol":["Pwdmp","KIAA1638","FLJ23127","ORF26","DYF-2","Oseg6","IFT144","NPHP13","FAP66","CFAP66"],"prev_symbol":[]},"alphafold":{"accession":"Q8NEZ3","domains":[{"cath_id":"2.130.10.10","chopping":"231-350","consensus_level":"medium","plddt":86.079,"start":231,"end":350},{"cath_id":"-","chopping":"1168-1241","consensus_level":"medium","plddt":86.5392,"start":1168,"end":1241},{"cath_id":"3.30.40","chopping":"1248-1309_1321-1342","consensus_level":"medium","plddt":83.4231,"start":1248,"end":1342},{"cath_id":"1.25.40","chopping":"1007-1101","consensus_level":"medium","plddt":76.1593,"start":1007,"end":1101}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NEZ3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NEZ3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NEZ3-F1-predicted_aligned_error_v6.png","plddt_mean":86.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WDR19","jax_strain_url":"https://www.jax.org/strain/search?query=WDR19"},"sequence":{"accession":"Q8NEZ3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NEZ3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NEZ3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NEZ3"}},"corpus_meta":[{"pmid":"22019273","id":"PMC_22019273","title":"Ciliopathies with skeletal anomalies and renal insufficiency due to mutations in the IFT-A gene WDR19.","date":"2011","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22019273","citation_count":189,"is_preprint":false},{"pmid":"16957054","id":"PMC_16957054","title":"Caenorhabditis elegans DYF-2, an orthologue of human WDR19, is a component of the intraflagellar transport machinery in sensory cilia.","date":"2006","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/16957054","citation_count":60,"is_preprint":false},{"pmid":"23683095","id":"PMC_23683095","title":"WDR19: an ancient, retrograde, intraflagellar ciliary protein is mutated in autosomal recessive retinitis pigmentosa and in Senior-Loken syndrome.","date":"2013","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23683095","citation_count":58,"is_preprint":false},{"pmid":"32323121","id":"PMC_32323121","title":"A novel homozygous mutation in WDR19 induces disorganization of microtubules in sperm flagella and nonsyndromic asthenoteratospermia.","date":"2020","source":"Journal of assisted reproduction and genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32323121","citation_count":42,"is_preprint":false},{"pmid":"24504730","id":"PMC_24504730","title":"Mutations in WDR19 encoding the intraflagellar transport component IFT144 cause a broad spectrum of ciliopathies.","date":"2014","source":"Pediatric nephrology (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/24504730","citation_count":37,"is_preprint":false},{"pmid":"32407316","id":"PMC_32407316","title":"Activation of cryptic splicing in bovine WDR19 is associated with reduced semen quality and male fertility.","date":"2020","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32407316","citation_count":35,"is_preprint":false},{"pmid":"33517396","id":"PMC_33517396","title":"Molecular basis of ciliary defects caused by compound heterozygous IFT144/WDR19 mutations found in cranioectodermal dysplasia.","date":"2021","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33517396","citation_count":24,"is_preprint":false},{"pmid":"25726036","id":"PMC_25726036","title":"Nephronophthisis 13: implications of its association with Caroli disease and altered intracellular localization of WDR19 in the kidney.","date":"2015","source":"Pediatric nephrology (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/25726036","citation_count":21,"is_preprint":false},{"pmid":"18316561","id":"PMC_18316561","title":"WDR19 expression is increased in prostate cancer compared with normal cells, but low-intensity expression in cancers is associated with shorter time to biochemical failures and local recurrence.","date":"2008","source":"Clinical cancer research : an official journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/18316561","citation_count":17,"is_preprint":false},{"pmid":"28621010","id":"PMC_28621010","title":"Diversity of renal phenotypes in patients with WDR19 mutations: Two case reports.","date":"2017","source":"Nephrology (Carlton, Vic.)","url":"https://pubmed.ncbi.nlm.nih.gov/28621010","citation_count":16,"is_preprint":false},{"pmid":"17690010","id":"PMC_17690010","title":"Evaluation of global clustering patterns and strain variation over an extended ORF26 gene locus from Kaposi's sarcoma herpesvirus.","date":"2007","source":"Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology","url":"https://pubmed.ncbi.nlm.nih.gov/17690010","citation_count":15,"is_preprint":false},{"pmid":"28509878","id":"PMC_28509878","title":"Antigenic and Biological Characterization of ORF2-6 Variants at Early Times Following PRRSV Infection.","date":"2017","source":"Viruses","url":"https://pubmed.ncbi.nlm.nih.gov/28509878","citation_count":15,"is_preprint":false},{"pmid":"12906858","id":"PMC_12906858","title":"Isolation and characterization of human and mouse WDR19,a novel WD-repeat protein exhibiting androgen-regulated expression in prostate epithelium.","date":"2003","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/12906858","citation_count":14,"is_preprint":false},{"pmid":"38449049","id":"PMC_38449049","title":"A chimeric porcine reproductive and respiratory syndrome virus 1 strain containing synthetic ORF2-6 genes can trigger T follicular helper cell and heterologous neutralizing antibody responses and confer enhanced cross-protection.","date":"2024","source":"Veterinary research","url":"https://pubmed.ncbi.nlm.nih.gov/38449049","citation_count":7,"is_preprint":false},{"pmid":"36833218","id":"PMC_36833218","title":"Stargardt-like Clinical Characteristics and Disease Course Associated with Variants in the WDR19 Gene.","date":"2023","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/36833218","citation_count":6,"is_preprint":false},{"pmid":"38715676","id":"PMC_38715676","title":"A case report of intrahepatic bile duct dilatation caused by WDR19 gene mutation and presented as Caroli syndrome.","date":"2024","source":"Translational pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/38715676","citation_count":4,"is_preprint":false},{"pmid":"38163131","id":"PMC_38163131","title":"Compound heterozygous WDR19 variants associated with nephronophthisis, Caroli disease, refractory epilepsy and congenital bilateral central blindness: Case report.","date":"2023","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/38163131","citation_count":3,"is_preprint":false},{"pmid":"35937515","id":"PMC_35937515","title":"Is C1q nephropathy associated with a WDR19 gene mutation? A case report.","date":"2021","source":"Hippokratia","url":"https://pubmed.ncbi.nlm.nih.gov/35937515","citation_count":1,"is_preprint":false},{"pmid":"35362211","id":"PMC_35362211","title":"A unique pancreatic phenotype in a child with a WDR19-related ciliopathy: A case report and literature review of pancreatic involvement in ciliopathies.","date":"2022","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/35362211","citation_count":1,"is_preprint":false},{"pmid":"40183892","id":"PMC_40183892","title":"Phenotypic spectrum and theoretical prime editing analysis of WDR19-mediated retinal degeneration.","date":"2025","source":"Documenta ophthalmologica. Advances in ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/40183892","citation_count":0,"is_preprint":false},{"pmid":"41141533","id":"PMC_41141533","title":"Elucidating Mechanisms of Hypomorphic WDR19-Related Kidney Failure.","date":"2025","source":"Kidney international reports","url":"https://pubmed.ncbi.nlm.nih.gov/41141533","citation_count":0,"is_preprint":false},{"pmid":"40647705","id":"PMC_40647705","title":"Early-Onset Retinal Dysfunction Associated with Novel WDR19 Variants in Sensenbrenner Syndrome.","date":"2025","source":"Diagnostics (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/40647705","citation_count":0,"is_preprint":false},{"pmid":"41942325","id":"PMC_41942325","title":"[Clinical characteristics and genetic analysis of a case of ciliopathy caused by novel WDR19 gene variants].","date":"2026","source":"Zhonghua nei ke za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/41942325","citation_count":0,"is_preprint":false},{"pmid":"39967245","id":"PMC_39967245","title":"WDR19-associated retinopathy presenting with adult-onset Stargardt-like phenotype.","date":"2025","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/39967245","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14097,"output_tokens":2195,"usd":0.037608},"stage2":{"model":"claude-opus-4-6","input_tokens":5466,"output_tokens":2261,"usd":0.125782},"total_usd":0.16339,"stage1_batch_id":"msgbatch_01BparvgRZ9S2LMidvaoo86K","stage2_batch_id":"msgbatch_01NkBfv9SVZWthhS7j6mU6G3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"C. elegans DYF-2 (ortholog of human WDR19) is a component of the IFT machinery in sensory cilia; loss of DYF-2 selectively affects assembly and motility of IFT complex components and leads to defects in cilia structure and chemosensation. DYF-2 associates with IFT particle complex B, and mutations in dyf-2 interfere with complex A component function, indicating a role in assembly of the IFT particle as a whole. Mouse WDR19 also localizes to cilia, confirming evolutionary conservation.\",\n      \"method\": \"Transgenic rescue of mutant phenotypes, sequencing of mutant alleles, fluorescence imaging of IFT component movement in Bardet-Biedl syndrome mutant background, live imaging of DYF-2 movement in cilia\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal genetic epistasis, rescue experiments, and direct localization with functional consequence; replicated in two organisms\",\n      \"pmids\": [\"16957054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"WDR19 encodes IFT144, a member of the IFT complex A that drives retrograde ciliary transport. Fibroblasts from Sensenbrenner syndrome patients show absence of IFT144 from cilia and perturbed ciliary abundance and morphology, directly demonstrating the ciliary pathogenesis of WDR19 mutations.\",\n      \"method\": \"Exome sequencing of patient families combined with immunofluorescence of patient fibroblasts showing IFT144 absence from cilia and perturbed ciliary morphology\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence in patient-derived cells, replicated across multiple families; foundational paper with 189 citations\",\n      \"pmids\": [\"22019273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"WDR19 encodes a WD-repeat protein with six WD repeats, a clathrin heavy-chain repeat, and three transmembrane domains, and is regulated by androgenic hormones in prostate epithelium. The gene comprises 36 exons on chromosome 4p15-4p11 and exhibits alternative splicing producing prostate-restricted isoforms.\",\n      \"method\": \"cDNA isolation, sequence analysis, RNA in situ hybridization, androgen regulation assays in prostate tissue\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct characterization of gene structure and androgen regulation; single lab but multiple methods\",\n      \"pmids\": [\"12906858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WDR19 localizes to sperm neck and flagella, and a homozygous WDR19 mutation (p.K1271E) causes its absence from these structures, resulting in complete destruction of sperm flagella ultrastructure (MMAF). IFT140 and IFT88, predicted direct interactors of WDR19, are mis-allocated in WDR19-mutated sperm, demonstrating WDR19's role in coordinating IFT complex localization within flagella.\",\n      \"method\": \"Immunofluorescence of patient sperm, scanning and transmission electron microscopy of sperm ultrastructure, whole exome sequencing\",\n      \"journal\": \"Journal of assisted reproduction and genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional consequence and downstream partner mislocalization shown in patient cells; single lab\",\n      \"pmids\": [\"32323121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IFT144/WDR19 compound heterozygous mutations (missense L710S and nonsense R1103*) cause distinct molecular defects: L710S is hypomorphic and rescues ciliogenesis defects when expressed in IFT144-KO cells, while R1103* exacerbates ciliogenesis defects. The two variants differ in their interactions with other IFT-A subunits and with the IFT-B complex. Coexpression of R1103* with hypomorphic L710S in IFT144-KO cells mimics the severe compound heterozygous CED patient phenotype.\",\n      \"method\": \"IFT144-knockout cell generation, exogenous expression of variant constructs in KO cells, ciliogenesis rescue assays, co-immunoprecipitation to assess interactions with IFT-A subunits and IFT-B complex\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — KO complementation with mutagenesis, protein interaction assays, and defined cellular phenotypic readouts in a single rigorous study\",\n      \"pmids\": [\"33517396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Mutant WDR19 protein in kidney tubular epithelium shows altered subcellular localization: control kidneys display localized expression along the luminal borders of renal tubular epithelium, whereas in NPHP13 patients the protein shows diffuse cytoplasmic staining, indicating mislocalization of mutant WDR19 away from the ciliary/apical membrane compartment.\",\n      \"method\": \"Immunohistochemistry on renal biopsy tissue from patients vs. controls\",\n      \"journal\": \"Pediatric nephrology (Berlin, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct localization experiment in patient tissue with functional implication; single lab, single method\",\n      \"pmids\": [\"25726036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A synonymous variant in bovine WDR19 activates a cryptic exonic splice site that eliminates three evolutionarily conserved amino acids, decreasing WDR19 protein expression and compromising semen quality and male fertility, consistent with WDR19's role in IFT complex function in motile cilia and flagella.\",\n      \"method\": \"Genome-wide association testing, whole-genome sequencing, bioinformatic splice site analysis, transcription analysis of cryptic splicing, Western blot of protein expression\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (transcription analysis + Western blot + genetic association) in a bovine ortholog study; single lab\",\n      \"pmids\": [\"32407316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A hypomorphic WDR19 missense variant (p.Cys293Tyr) impairs nephron development in kidney organoids, causing delayed differentiation, cystogenesis, and structural abnormalities in tubular and glomerular structures. Mutant organoids display reduced ciliation and shortened cilia. Both hypomorphic and loss-of-function variants cause Sonic hedgehog pathway dysregulation, with upregulation associated with reduced ciliation and significant downregulation of FGF8, suggesting an inverse relationship between Shh and FGF8 pathways during kidney organoid development.\",\n      \"method\": \"CRISPR-Cas9 knock-in of patient variants in hESCs, patient-derived iPSC kidney organoids, immunofluorescence, electron microscopy, RNA-sequencing and pathway analysis\",\n      \"journal\": \"Kidney international reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution in organoid model with multiple orthogonal methods (EM, IF, RNA-seq) and CRISPR-engineered patient variants; single lab but rigorous\",\n      \"pmids\": [\"41141533\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WDR19 encodes IFT144, a core subunit of the IFT-A complex that drives retrograde intraflagellar transport; it localizes to cilia and flagella where it is required for IFT particle assembly and integrity, coordinates the localization of partner IFT-A and IFT-B subunits, and its loss or mislocalization disrupts ciliogenesis, ciliary protein trafficking, and downstream hedgehog signaling, causing a spectrum of ciliopathies affecting the kidney, retina, skeleton, and male fertility.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"WDR19 encodes IFT144, a WD-repeat protein that serves as a core subunit of the intraflagellar transport complex A (IFT-A), essential for retrograde ciliary transport, ciliogenesis, and ciliary protein trafficking in both primary and motile cilia [PMID:16957054, PMID:22019273]. IFT144 localizes to cilia and flagella and coordinates the assembly and localization of other IFT-A and IFT-B subunits; its loss causes mislocalization of partner proteins IFT140 and IFT88 and destruction of flagellar ultrastructure [PMID:32323121, PMID:33517396]. WDR19 mutations disrupt Sonic hedgehog signaling and FGF8 pathway regulation downstream of impaired ciliation, leading to nephron developmental defects including cystogenesis [PMID:41141533]. Biallelic WDR19 mutations cause a spectrum of ciliopathies including Sensenbrenner syndrome (cranioectodermal dysplasia), nephronophthisis (NPHP13), retinal dystrophy, and male infertility due to multiple morphological abnormalities of the flagella [PMID:22019273, PMID:25726036, PMID:32323121].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Before its ciliary role was known, WDR19 was characterized as a WD-repeat protein with domain architecture including clathrin heavy-chain repeats and transmembrane domains, establishing its structural framework and revealing androgen-regulated expression in prostate epithelium.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, RNA in situ hybridization, and androgen regulation assays in prostate tissue\",\n      \"pmids\": [\"12906858\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Androgen regulation has not been linked to ciliary function\", \"Prostate-specific isoform functions remain uncharacterized\", \"Predicted transmembrane domains have not been experimentally validated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of C. elegans DYF-2 as a WDR19 ortholog revealed that the gene encodes an IFT machinery component: loss of DYF-2 disrupted IFT particle assembly, ciliary structure, and chemosensation, and mouse WDR19 localized to cilia, establishing an evolutionarily conserved role in intraflagellar transport.\",\n      \"evidence\": \"Transgenic rescue of C. elegans mutants, live imaging of IFT component movement in cilia, fluorescence localization in mouse\",\n      \"pmids\": [\"16957054\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise position of IFT144 within the IFT-A complex architecture was unknown\", \"No human disease link had been established\", \"Retrograde vs. anterograde transport contribution was not fully dissected\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Exome sequencing of Sensenbrenner syndrome families established that WDR19 mutations cause human ciliopathy, and patient fibroblasts showed absence of IFT144 from cilia with perturbed ciliary morphology, directly linking WDR19 loss-of-function to defective ciliogenesis in disease.\",\n      \"evidence\": \"Exome sequencing of multiple patient families, immunofluorescence of patient fibroblasts\",\n      \"pmids\": [\"22019273\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype correlations across the ciliopathy spectrum were not delineated\", \"Molecular mechanism by which specific mutations disrupt IFT-A assembly was unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Immunohistochemistry of NPHP13 patient kidneys showed that mutant WDR19 mislocalizes from the luminal/apical membrane to diffuse cytoplasm in renal tubular epithelium, demonstrating that pathogenic variants impair protein targeting to the ciliary compartment in disease-relevant tissue.\",\n      \"evidence\": \"Immunohistochemistry on renal biopsies from patients vs. controls\",\n      \"pmids\": [\"25726036\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method (IHC) without complementary biochemical confirmation\", \"Whether mislocalization is cause or consequence of ciliary loss was not resolved\", \"Mechanism of apical targeting was not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Two parallel studies extended WDR19 function to motile flagella and male fertility: human WDR19 mutation caused complete destruction of sperm flagellar ultrastructure with mislocalization of IFT140 and IFT88, while a bovine synonymous variant activated cryptic splicing that reduced WDR19 protein and impaired semen quality, establishing WDR19 as essential for flagellar assembly across species.\",\n      \"evidence\": \"Immunofluorescence and electron microscopy of patient sperm (human); GWAS, whole-genome sequencing, splice analysis, and Western blot (bovine)\",\n      \"pmids\": [\"32323121\", \"32407316\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis for IFT144 interaction with IFT140 and IFT88 remains unresolved\", \"Whether WDR19 has flagella-specific functions beyond canonical IFT-A is unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Knockout-rescue experiments demonstrated that distinct WDR19 mutations have quantitatively different effects on IFT-A and IFT-B complex interactions: a hypomorphic missense (L710S) rescued ciliogenesis while a truncating variant (R1103*) exacerbated defects, and their coexpression reconstituted the severe compound heterozygous patient phenotype, establishing an allelic mechanism for phenotypic severity.\",\n      \"evidence\": \"CRISPR IFT144-KO cells, exogenous variant expression, ciliogenesis rescue assays, co-immunoprecipitation\",\n      \"pmids\": [\"33517396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for differential interaction defects of missense vs. truncation variants is unknown\", \"In vivo validation of the compound heterozygote model was not performed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Kidney organoid modeling revealed that hypomorphic WDR19 variants impair nephron development by reducing ciliation and dysregulating Sonic hedgehog signaling, with an inverse relationship between Shh upregulation and FGF8 downregulation, providing a mechanistic link from IFT defects through Shh to developmental kidney pathology.\",\n      \"evidence\": \"CRISPR knock-in of patient variants in hESCs, iPSC-derived kidney organoids, electron microscopy, immunofluorescence, RNA-sequencing\",\n      \"pmids\": [\"41141533\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Shh-FGF8 axis dysregulation occurs in vivo in patient kidneys is not established\", \"Direct versus indirect effects on hedgehog signaling components have not been dissected\", \"Role of WDR19 in glomerular vs. tubular pathology needs further delineation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"High-resolution structural data for IFT144 within the assembled IFT-A complex are lacking, and the precise biochemical contributions of individual WD-repeat and clathrin-heavy-chain-repeat domains to IFT-A subunit interactions, cargo recognition, and retrograde motor coupling remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No atomic-resolution structure of IFT144 in the IFT-A context\", \"Cargo specificity of IFT144 is unknown\", \"Relationship between androgen regulation and ciliary function is entirely unexplored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 3, 5]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 4, 7]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [\n      \"IFT-A complex\"\n    ],\n    \"partners\": [\n      \"IFT140\",\n      \"IFT88\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}