Affinage

WDR19

WD repeat-containing protein 19 · UniProt Q8NEZ3

Length
1342 aa
Mass
151.6 kDa
Annotated
2026-04-28
24 papers in source corpus 8 papers cited in narrative 8 extracted findings

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

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).

Mechanistic history

Synthesis pass · year-by-year structured walk · 7 steps
  1. 2003 Medium

    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

    PMID:12906858

    Open questions at the time
    • Androgen regulation has not been linked to ciliary function
    • Prostate-specific isoform functions remain uncharacterized
    • Predicted transmembrane domains have not been experimentally validated
  2. 2006 High

    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

    PMID:16957054

    Open questions at the time
    • 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
  3. 2011 High

    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

    PMID:22019273

    Open questions at the time
    • Genotype-phenotype correlations across the ciliopathy spectrum were not delineated
    • Molecular mechanism by which specific mutations disrupt IFT-A assembly was unknown
  4. 2015 Medium

    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

    PMID:25726036

    Open questions at the time
    • 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
  5. 2020 Medium

    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)

    PMID:32323121 PMID:32407316

    Open questions at the time
    • Structural basis for IFT144 interaction with IFT140 and IFT88 remains unresolved
    • Whether WDR19 has flagella-specific functions beyond canonical IFT-A is unknown
  6. 2021 High

    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

    PMID:33517396

    Open questions at the time
    • Structural basis for differential interaction defects of missense vs. truncation variants is unknown
    • In vivo validation of the compound heterozygote model was not performed
  7. 2025 High

    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

    PMID:41141533

    Open questions at the time
    • 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

Open questions

Synthesis pass · forward-looking unresolved questions
  • 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.
  • 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

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0005198 structural molecule activity 3
Localization
GO:0005929 cilium 4 GO:0005856 cytoskeleton 1
Pathway
R-HSA-1852241 Organelle biogenesis and maintenance 4 R-HSA-1266738 Developmental Biology 1 R-HSA-162582 Signal Transduction 1
Partners
IFT140IFT88
Complex memberships
IFT-A complex

Evidence

Reading pass · 8 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2006 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. 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 Molecular biology of the cell High 16957054
2011 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. Exome sequencing of patient families combined with immunofluorescence of patient fibroblasts showing IFT144 absence from cilia and perturbed ciliary morphology American journal of human genetics High 22019273
2003 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. cDNA isolation, sequence analysis, RNA in situ hybridization, androgen regulation assays in prostate tissue Genomics Medium 12906858
2020 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. Immunofluorescence of patient sperm, scanning and transmission electron microscopy of sperm ultrastructure, whole exome sequencing Journal of assisted reproduction and genetics Medium 32323121
2021 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. 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 Human molecular genetics High 33517396
2015 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. Immunohistochemistry on renal biopsy tissue from patients vs. controls Pediatric nephrology (Berlin, Germany) Medium 25726036
2020 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. Genome-wide association testing, whole-genome sequencing, bioinformatic splice site analysis, transcription analysis of cryptic splicing, Western blot of protein expression PLoS genetics Medium 32407316
2025 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. CRISPR-Cas9 knock-in of patient variants in hESCs, patient-derived iPSC kidney organoids, immunofluorescence, electron microscopy, RNA-sequencing and pathway analysis Kidney international reports High 41141533

Source papers

Stage 0 corpus · 24 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 189 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 58 23683095
2020 A novel homozygous mutation in WDR19 induces disorganization of microtubules in sperm flagella and nonsyndromic asthenoteratospermia. Journal of assisted reproduction and genetics 42 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 35 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
2017 Antigenic and Biological Characterization of ORF2-6 Variants at Early Times Following PRRSV Infection. Viruses 15 28509878
2007 Evaluation of global clustering patterns and strain variation over an extended ORF26 gene locus from Kaposi's sarcoma herpesvirus. Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology 15 17690010
2003 Isolation and characterization of human and mouse WDR19,a novel WD-repeat protein exhibiting androgen-regulated expression in prostate epithelium. Genomics 14 12906858
2024 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. Veterinary research 7 38449049
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 3 38163131
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 WDR19-associated retinopathy presenting with adult-onset Stargardt-like phenotype. Ophthalmic genetics 0 39967245
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