Affinage

WDR19

WD repeat-containing protein 19 · UniProt Q8NEZ3

Length
1342 aa
Mass
151.6 kDa
Annotated
2026-06-11
21 papers in source corpus 8 papers cited in narrative 8 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 7/7 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

WDR19 (IFT144) is a WD-repeat protein that functions as a core subunit of the intraflagellar transport complex A (IFT-A), the machinery that drives retrograde ciliary transport and is required for ciliary biogenesis and integrity (PMID:16957054, PMID:22019273). First defined through its C. elegans ortholog DYF-2, the protein is a component of the IFT machinery whose loss disrupts assembly and motility of distinct IFT components and produces structural cilia and chemosensation defects, with genetic interactions implicating it in IFT particle assembly across both complex A and complex B (PMID:16957054). WDR19 localizes to cilia and is required for proper allocation of other IFT subunits, including its predicted direct interactors IFT140 and IFT88, which become mislocalized when WDR19 is absent (PMID:32323121). Pathogenic WDR19 mutations abolish or redistribute the protein from the ciliary compartment and perturb ciliary abundance and morphology in patient fibroblasts, sperm flagella, and kidney epithelium, establishing a ciliary basis for disease (PMID:22019273, PMID:32323121, PMID:25726036). Reconstitution in IFT144-knockout cells distinguishes hypomorphic from loss-of-function alleles, which differ in their interactions with IFT-A and IFT-B subunits and combine to produce graded ciliogenesis defects matching patient genotypes (PMID:33517396). In kidney organoid models, both hypomorphic and loss-of-function variants reduce ciliation and dysregulate Sonic hedgehog signaling, with severe loss-of-function upregulating Shh and downregulating FGF8, impairing nephron development and causing cystogenesis (PMID:41141533). These molecular defects underlie a spectrum of ciliopathies including Sensenbrenner/cranioectodermal dysplasia and NPHP13 nephronophthisis, as well as MMAF-associated male infertility (PMID:22019273, PMID:33517396, PMID:32323121, PMID:25726036).

Mechanistic history

Synthesis pass · year-by-year structured walk · 8 steps
  1. 2006 High

    Established WDR19 (via the C. elegans ortholog DYF-2) as a genuine component of the intraflagellar transport machinery, answering whether the protein acts within cilia and how it relates to IFT complexes A and B.

    Evidence Transgenic rescue, allele sequencing, live imaging of IFT component movement and BBS double-mutant epistasis in C. elegans, plus mouse WDR19 ciliary localization

    PMID:16957054

    Open questions at the time
    • Direct biochemical demonstration of IFT-A subunit composition in mammals not shown
    • Distinct contributions to anterograde versus retrograde transport not resolved
    • Human protein function inferred from ortholog, not directly tested here
  2. 2003 Medium

    Provided the first molecular characterization of human WDR19, defining its WD-repeat and clathrin heavy-chain repeat domain architecture and androgen-regulated prostate expression before its ciliary role was known.

    Evidence cDNA cloning, sequence analysis, RNA in situ hybridization and androgen regulation assay in prostate tissue

    PMID:12906858

    Open questions at the time
    • No functional link between prostate expression and ciliary biology established
    • Functional role of the reported transmembrane domains not characterized
    • Significance of the prostate-restricted splice isoforms unknown
  3. 2011 Medium

    Connected WDR19/IFT144 mutations to human ciliopathy by showing loss of the protein from cilia in patient cells, answering whether disease mutations act through a ciliary mechanism.

    Evidence Exome sequencing and immunofluorescence of Sensenbrenner syndrome patient-derived fibroblasts

    PMID:22019273

    Open questions at the time
    • Single lab, descriptive localization without functional rescue
    • Mechanism linking absent protein to altered ciliary morphology not dissected
  4. 2015 Low

    Showed that pathogenic WDR19 mutations redistribute the protein from the ciliary border to diffuse cytoplasm in kidney, linking mislocalization to nephronophthisis (NPHP13).

    Evidence Immunohistochemistry on NPHP13 patient and control kidney biopsy tissue

    PMID:25726036

    Open questions at the time
    • Single localization method (IHC) in patient tissue with no functional rescue
    • Causality between mislocalization and tubular pathology not established
    • No quantification of ciliary defect
  5. 2020 Medium

    Extended WDR19 function to sperm flagella, demonstrating it is required for proper IFT subunit allocation (IFT140, IFT88) and flagellar microtubule organization, explaining a male infertility (MMAF) phenotype.

    Evidence Whole exome sequencing, immunofluorescence and scanning/transmission electron microscopy of patient sperm

    PMID:32323121

    Open questions at the time
    • Direct physical interaction with IFT140/IFT88 inferred, not biochemically demonstrated here
    • Single patient/single lab without rescue
    • Tissue-specific requirements versus shared ciliary mechanism not separated
  6. 2020 Medium

    Demonstrated in a bovine model that even a synonymous WDR19 variant compromising splicing and protein level reduces semen quality, reinforcing a dose-dependent requirement for WDR19 in male fertility.

    Evidence GWAS, whole-genome sequencing, splice-site analysis, mRNA transcription analysis and Western blot in cattle

    PMID:32407316

    Open questions at the time
    • Ciliary/flagellar mechanism not directly imaged in this study
    • Relevance of bovine finding to human alleles not tested
  7. 2021 High

    Resolved how compound heterozygous alleles combine to cause disease, distinguishing hypomorphic from loss-of-function variants by their differential ciliogenesis rescue and altered IFT-A/IFT-B interactions.

    Evidence IFT144-knockout cell reconstitution with WT and mutant variants, ciliogenesis rescue assays, immunofluorescence and co-immunoprecipitation for IFT-A and IFT-B interactions

    PMID:33517396

    Open questions at the time
    • Which specific IFT-A/IFT-B contacts are lost for each variant not mapped at residue level
    • Structural basis of variant-specific interaction changes not determined
  8. 2025 Medium

    Linked WDR19 dysfunction to a downstream signaling defect, showing both hypomorphic and loss-of-function variants reduce ciliation and dysregulate Sonic hedgehog signaling to impair nephron development.

    Evidence CRISPR-Cas9 engineering of patient variants in hESCs, patient iPSC-derived kidney organoids, immunofluorescence, electron microscopy and RNA-sequencing pathway analysis

    PMID:41141533

    Open questions at the time
    • Mechanistic link between IFT-A retrograde transport and Shh/FGF8 dysregulation not directly traced
    • Single lab organoid model; in vivo kidney correlation not established
    • Allele-specific severity gradient not fully mapped to transport defects

Open questions

Synthesis pass · forward-looking unresolved questions
  • How WDR19 physically organizes IFT-A architecture at the structural level and how disrupted retrograde transport mechanistically translates into Shh signaling dysregulation across tissues remains unresolved.
  • No structural model of WDR19 within the IFT-A complex in the corpus
  • Direct biochemical mapping of WDR19-IFT140/IFT88 contacts not established
  • Causal chain from IFT-A defect to Shh/FGF8 transcriptional changes not defined

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0060090 molecular adaptor activity 3
Localization
GO:0005929 cilium 4 GO:0005856 cytoskeleton 1
Pathway
R-HSA-5653656 Vesicle-mediated transport 2 R-HSA-1266738 Developmental Biology 1 R-HSA-162582 Signal Transduction 1
Partners
IFT140IFT88
Complex memberships
IFT-A complexintraflagellar transport (IFT) machinery

Evidence

Reading pass · 8 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2006 C. elegans DYF-2 (WDR19 ortholog) is a component of the IFT machinery in sensory cilia; loss of DYF-2 selectively affects assembly and motility of different IFT components and leads to cilia structural defects and chemosensation defects. DYF-2 associates with IFT complex B, and mutations in dyf-2 also interfere with complex A function, suggesting a role in IFT particle assembly as a whole. The mouse ortholog WDR19 localizes to cilia. Transgenic rescue of mutant phenotypes, sequencing of mutant alleles, fluorescence imaging of IFT component movement, Bardet-Biedl syndrome double-mutant analysis (genetic epistasis), localization of mouse WDR19 to cilia Molecular biology of the cell High 16957054
2011 WDR19 encodes IFT144, a member of IFT complex A that drives retrograde ciliary transport. In fibroblasts from a Sensenbrenner syndrome patient with WDR19 mutations, IFT144 protein is absent from cilia and ciliary abundance and morphology are perturbed, demonstrating ciliary pathogenesis. Exome sequencing to identify mutations; immunofluorescence of patient-derived fibroblasts to assess ciliary localization and morphology American journal of human genetics Medium 22019273
2021 Compound heterozygous IFT144/WDR19 mutations (missense L710S and nonsense R1103*) cause severe ciliary defects via a specific mechanism: L710S is hypomorphic (partially rescues ciliogenesis and ciliary protein localization in IFT144-KO cells), while R1103* exacerbates ciliogenesis defects on its own but rescues defects when co-expressed with WT. Co-expression of R1103* with the hypomorphic L710S mimics the CED patient genotype and results in severe ciliogenesis defects. The two variants differ in their interactions with other IFT-A subunits and with the IFT-B complex. IFT144-knockout (KO) cell lines, exogenous expression of WT and mutant IFT144 variants, ciliogenesis rescue assays, immunofluorescence for ciliary protein localization, co-immunoprecipitation to assess IFT-A and IFT-B interactions Human molecular genetics High 33517396
2020 WDR19 localizes to the sperm neck and flagella; a homozygous missense mutation (p.K1271E) causes complete absence of WDR19 from sperm neck and flagella, leading to ultrastructural disorganization of sperm flagella microtubules and MMAF. IFT140 and IFT88 (predicted direct interactors of WDR19) are mis-allocated in WDR19-mutated sperm, indicating WDR19 is required for proper IFT complex assembly and localization in sperm flagella. Whole exome sequencing, immunofluorescence of patient sperm, scanning and transmission electron microscopy of sperm ultrastructure Journal of assisted reproduction and genetics Medium 32323121
2015 In control kidney tissue, WDR19 protein localizes along the luminal borders of renal tubular epithelium (consistent with ciliary localization). In kidneys of NPHP13 patients with WDR19 mutations, the protein shows diffuse cytoplasmic staining instead, indicating that pathogenic mutations alter the subcellular localization of WDR19 in kidney cells. Immunohistochemistry on patient kidney biopsy tissue and control kidney tissue Pediatric nephrology (Berlin, Germany) Low 25726036
2020 A synonymous variant in bovine WDR19 (BTA6:58373887C>T) activates a cryptic exonic splice site that eliminates three evolutionarily conserved amino acids from the WDR19 protein and decreases protein expression, resulting in compromised semen quality and male fertility. Genome-wide association study, whole-genome sequencing, bioinformatic splice-site analysis, transcription analysis (mRNA), Western blot for protein expression PLoS genetics Medium 32407316
2025 A hypomorphic WDR19 variant (p.Cys293Tyr) impairs nephron development in kidney organoids, causing delayed differentiation, cystogenesis, and structural abnormalities in tubular and glomerular structures. Mutant organoids show reduced ciliation and shortened cilia. Both hypomorphic and loss-of-function WDR19 variants dysregulate Sonic hedgehog (Shh) signaling; severe loss-of-function upregulates Shh and significantly reduces ciliation, which is associated with downregulation of FGF8 and alterations in associated transcriptomic pathways. CRISPR-Cas9 engineering of patient-specific variants in human embryonic stem cells (hESCs), patient-derived iPSC differentiation into kidney organoids, immunofluorescence, electron microscopy, RNA-sequencing and pathway analysis Kidney international reports Medium 41141533
2003 WDR19 encodes a WD-repeat protein containing six WD repeats, a clathrin heavy-chain repeat, and three transmembrane domains. It is expressed in prostate epithelium, regulated by androgenic hormones, and exhibits alternative splicing producing two prostate-restricted isoforms. cDNA cloning, sequence analysis, RNA in situ hybridization, androgen regulation assay in prostate tissue Genomics Medium 12906858

Source papers

Stage 0 corpus · 21 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2011 Ciliopathies with skeletal anomalies and renal insufficiency due to mutations in the IFT-A gene WDR19. American journal of human genetics 190 22019273
2006 Caenorhabditis elegans DYF-2, an orthologue of human WDR19, is a component of the intraflagellar transport machinery in sensory cilia. Molecular biology of the cell 60 16957054
2013 WDR19: an ancient, retrograde, intraflagellar ciliary protein is mutated in autosomal recessive retinitis pigmentosa and in Senior-Loken syndrome. Clinical genetics 59 23683095
2020 A novel homozygous mutation in WDR19 induces disorganization of microtubules in sperm flagella and nonsyndromic asthenoteratospermia. Journal of assisted reproduction and genetics 43 32323121
2014 Mutations in WDR19 encoding the intraflagellar transport component IFT144 cause a broad spectrum of ciliopathies. Pediatric nephrology (Berlin, Germany) 37 24504730
2020 Activation of cryptic splicing in bovine WDR19 is associated with reduced semen quality and male fertility. PLoS genetics 36 32407316
2021 Molecular basis of ciliary defects caused by compound heterozygous IFT144/WDR19 mutations found in cranioectodermal dysplasia. Human molecular genetics 24 33517396
2015 Nephronophthisis 13: implications of its association with Caroli disease and altered intracellular localization of WDR19 in the kidney. Pediatric nephrology (Berlin, Germany) 21 25726036
2008 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. Clinical cancer research : an official journal of the American Association for Cancer Research 17 18316561
2017 Diversity of renal phenotypes in patients with WDR19 mutations: Two case reports. Nephrology (Carlton, Vic.) 16 28621010
2003 Isolation and characterization of human and mouse WDR19,a novel WD-repeat protein exhibiting androgen-regulated expression in prostate epithelium. Genomics 14 12906858
2023 Stargardt-like Clinical Characteristics and Disease Course Associated with Variants in the WDR19 Gene. Genes 6 36833218
2024 A case report of intrahepatic bile duct dilatation caused by WDR19 gene mutation and presented as Caroli syndrome. Translational pediatrics 4 38715676
2023 Compound heterozygous WDR19 variants associated with nephronophthisis, Caroli disease, refractory epilepsy and congenital bilateral central blindness: Case report. Heliyon 4 38163131
2025 WDR19-associated retinopathy presenting with adult-onset Stargardt-like phenotype. Ophthalmic genetics 1 39967245
2022 A unique pancreatic phenotype in a child with a WDR19-related ciliopathy: A case report and literature review of pancreatic involvement in ciliopathies. American journal of medical genetics. Part A 1 35362211
2021 Is C1q nephropathy associated with a WDR19 gene mutation? A case report. Hippokratia 1 35937515
2026 [Clinical characteristics and genetic analysis of a case of ciliopathy caused by novel WDR19 gene variants]. Zhonghua nei ke za zhi 0 41942325
2025 Phenotypic spectrum and theoretical prime editing analysis of WDR19-mediated retinal degeneration. Documenta ophthalmologica. Advances in ophthalmology 0 40183892
2025 Early-Onset Retinal Dysfunction Associated with Novel WDR19 Variants in Sensenbrenner Syndrome. Diagnostics (Basel, Switzerland) 0 40647705
2025 Elucidating Mechanisms of Hypomorphic WDR19-Related Kidney Failure. Kidney international reports 0 41141533

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