Affinage

WASHC1

WASH complex subunit 1 · UniProt A8K0Z3

Length
465 aa
Mass
50.3 kDa
Annotated
2026-04-28
23 papers in source corpus 10 papers cited in narrative 10 extracted findings

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

WASHC1 (WASH1) is an actin nucleation-promoting factor that activates the Arp2/3 complex to generate branched actin filaments on endosomal membranes, driving membrane tubulation and receptor recycling critical for lipid metabolism, neurotrophin signaling, and cell division. Recruited to endosomes via the retromer complex (VPS35/VPS29/VPS26) as part of a multisubunit WASH complex containing strumpellin, WASHC1 promotes tubule-based retrieval of transmembrane cargoes including LDLR, LRP1, SR-BI, and TrkA, and its hepatic or intestinal ablation impairs cholesterol homeostasis (PMID:20923837, PMID:31167970, PMID:34486665, PMID:38086439). Beyond endosomal functions, nuclear WASHC1 interacts with MCM2-7 helicase components at replication origins to promote origin licensing and protect against replication stress-induced chromosomal instability (PMID:35733063), and cytoplasmic WASHC1 binds the p62 UBA domain to suppress mitophagy by blocking recognition of damaged mitochondria (PMID:41740506).

Mechanistic history

Synthesis pass · year-by-year structured walk · 8 steps
  1. 2010 High

    Establishing that WASHC1 functions as an endosomal actin nucleation-promoting factor recruited by retromer resolved how branched actin assembly is spatially targeted to endosomal membranes to control tubule dynamics.

    Evidence Co-immunoprecipitation and endosomal localization studies identifying the WASH complex (including strumpellin) and its retromer interaction

    PMID:20923837

    Open questions at the time
    • Specific cargo molecules recycled via WASH-dependent tubules were not identified
    • Structural basis of retromer–WASH interaction not resolved
    • Whether WASH has functions beyond endosomal actin nucleation was unknown
  2. 2014 High

    Demonstrating that WASHC1 activates Arp2/3 to generate actin networks required for polar body extrusion during oocyte meiosis extended its role beyond endosomal trafficking to cell division.

    Evidence Morpholino knockdown and antibody injection in mouse oocytes with time-lapse microscopy showing spindle migration and asymmetric division defects

    PMID:24998208

    Open questions at the time
    • Whether the oocyte function is endosome-dependent or reflects a distinct pool of WASHC1 was not resolved
    • Downstream signaling consequences of symmetric division were not explored
  3. 2015 Low

    Showing that strumpellin depletion destabilizes WASHC1 protein and that proteasomal inhibition rescues WASHC1 levels established that WASHC1 stability depends on WASH complex integrity and proteasomal regulation.

    Evidence siRNA knockdown and MG132 treatment in cortical neurons with Western blot

    PMID:25987849

    Open questions at the time
    • WASHC1 finding is secondary to strumpellin–spartin study; no direct ubiquitination mapping performed
    • Whether proteasomal regulation of WASHC1 is tissue-specific was not addressed
  4. 2019 High

    Identifying LDLR, LRP1, and SR-BI as specific cargoes of WASH-dependent endosomal recycling in hepatocytes provided the first in vivo link between WASHC1 and cholesterol/lipoprotein metabolism.

    Evidence Liver-specific conditional Washc1 knockout in mice with surface receptor quantification, IDOL-dependent proteolysis, and cholesterol metabolism assays

    PMID:31167970

    Open questions at the time
    • Whether WASHC1 directly sorts these receptors or acts broadly on all retromer cargo was not resolved
    • Compensatory endosomal sorting mechanisms in vivo were not characterized
  5. 2021 Medium

    Two studies expanded WASHC1's cargo repertoire and cellular contexts: WASHC1 participates in Rab7-positive late endosome tubulation to retrieve TrkA in neurons, and BBS1-dependent proteasomal clearance of centrosomal WASHC1 enables immune synapse formation in T cells.

    Evidence siRNA knockdown with live imaging in neuronal cultures (TrkA retrieval) and T cells (centrosome polarization); immunofluorescence and co-IP

    PMID:34423835 PMID:34486665

    Open questions at the time
    • Whether WASHC1's role in TrkA retrieval is disrupted in Charcot-Marie-Tooth 2B patients was not directly tested
    • Mechanism of BBS1-directed proteasomal targeting of WASHC1 at centrosomes needs further dissection
  6. 2022 Medium

    Discovering that nuclear WASHC1 interacts with MCM2-7 helicase subunits and promotes their loading at replication origins revealed an unexpected non-endosomal function in genome stability maintenance.

    Evidence Co-IP, proximity ligation assay, ChIP at replication origins, WASHC1 knockout and rescue in HeLa and 3T3 cells

    PMID:35733063

    Open questions at the time
    • How WASHC1 is imported into the nucleus and whether this pool is regulated independently of endosomal WASHC1 is unknown
    • Whether WASHC1's actin-nucleation activity is relevant at origins was not tested
    • Single-lab finding awaits independent replication
  7. 2023 Medium

    Demonstrating that enterocyte-specific Washc1 ablation halves intestinal cholesterol absorption extended WASHC1's metabolic role from hepatic to intestinal lipid handling.

    Evidence Intestine-specific conditional knockout in mice with cholesterol absorption and bile acid composition assays

    PMID:38086439

    Open questions at the time
    • The specific cholesterol transporter(s) recycled by WASHC1 in enterocytes were not identified
    • Whether the bile acid composition change is a direct or indirect consequence of WASHC1 loss was not resolved
  8. 2026 Medium

    Establishing that WASHC1 binds the p62 UBA domain to block damaged-mitochondria recognition revealed a mitophagy-suppressive function independent of its actin nucleation and endosomal recycling roles.

    Evidence GST pull-down and co-IP confirming direct WASH1–p62 interaction; CUT&Tag, ChIP-qPCR for transcriptional regulation by H3K18 lactylation; mitophagy and apoptosis readouts in prolactinoma cells

    PMID:41740506

    Open questions at the time
    • Whether the WASH1–p62 interaction occurs broadly or is restricted to prolactinoma/high-lactylation contexts is unknown
    • How WASH1 binding to p62 is regulated relative to its endosomal functions was not addressed
    • Single-lab finding in a specific tumor model

Open questions

Synthesis pass · forward-looking unresolved questions
  • Key unresolved questions include how WASHC1's distinct functional pools (endosomal, nuclear, cytoplasmic/mitophagy) are partitioned and regulated, what structural features determine cargo selectivity, and whether WASHC1 mutations cause human Mendelian disease.
  • No structural model of WASHC1 within the WASH complex or bound to retromer
  • Mechanism of nuclear import and regulation of nuclear vs. endosomal WASHC1 pools unknown
  • No human genetic disease directly attributed to WASHC1 mutations in the literature

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0008092 cytoskeletal protein binding 4
Localization
GO:0005768 endosome 3 GO:0005634 nucleus 1 GO:0005829 cytosol 1
Pathway
R-HSA-5653656 Vesicle-mediated transport 4 R-HSA-1430728 Metabolism 2 R-HSA-9612973 Autophagy 1
Partners
ARPC2MCM2SQSTM1STRUMPELLINVPS26VPS29VPS35
Complex memberships
WASH complex

Evidence

Reading pass · 10 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2010 WASH1 is part of a protein complex that includes strumpellin and is recruited to endosomal membranes via interactions with the cargo-selective retromer complex (VPS35/VPS29/VPS26 trimer), where it functions as an actin-nucleation promoting factor to regulate endosomal tubule dynamics. Co-immunoprecipitation, protein complex identification, endosomal localization studies Journal of cell science High 20923837
2014 WASH1 functions as a nucleation-promoting factor activating the Arp2/3 complex to generate branched actin filaments required for polar body extrusion and asymmetric division during mouse oocyte meiosis; depletion of WASH1 reduces Arp2/3 complex expression, disrupts actin filament distribution, causes spindle formation and migration defects, and leads to symmetric division. Morpholino knockdown, antibody injection, time-lapse microscopy, immunofluorescence in mouse oocytes Scientific reports High 24998208
2019 Hepatic WASHC1 is required for endosomal recycling of LDL receptor (LDLR) and LRP1 to the hepatocyte surface; Washc1 ablation reduces surface LDLR and LRP1, increases LDLR proteolysis by IDOL (inducible degrader of LDLR), and reduces scavenger receptor class B type I surface levels, impairing selective HDL cholesterol uptake. Liver-specific conditional knockout in mice, flow cytometry for surface receptor levels, Western blot, cholesterol metabolism assays JCI insight High 31167970
2021 BBS1 promotes centrosome polarization toward the immune synapse by enabling proteasome-dependent clearance of centrosomal F-actin and its positive regulator WASH1 (WASHC1); BBS1 couples the 19S proteasome regulatory subunit to dynein for transport to the centrosome, functioning upstream of WASH1 in T cell synapse assembly. siRNA knockdown, live imaging, immunofluorescence, co-immunoprecipitation in T cells Journal of cell science Medium 34423835
2021 WASH1 (WASHC1) is involved in the tubulation of Rab7-positive late endosomes/MVBs to retrieve TrkA through tubular microdomains; together with endophilinA1/A2/A3, WASH1 participates in the tubulation process, and this mechanism is disrupted in Charcot-Marie-Tooth disease 2B. siRNA knockdown, live imaging, immunofluorescence in neuronal cultures Journal of cell science Medium 34486665
2022 Nuclear WASHC1 interacts with multiple components of the MCM2-7 replicative helicase complex and associates with DNA replication origins; WASHC1 promotes MCM protein loading at origins, and its loss sensitizes cells to replication stress (hydroxyurea) and increases chromosomal instability. Co-immunoprecipitation, proximity ligation assay, chromatin immunoprecipitation, WASHC1 knockout and rescue in HeLa and 3T3 cells Molecular biology reports Medium 35733063
2023 Intestinal WASHC1 is required for efficient intestinal cholesterol absorption; enterocyte-specific Washc1 ablation reduces intestinal cholesterol absorption ~2-fold, increases fecal neutral sterol loss, and alters biliary bile acid composition (reduced 12α-/non-12α-hydroxylated BA ratio), implicating the WASH complex in endosomal recycling of cholesterol absorption machinery. Intestine-specific conditional knockout in mice, cholesterol absorption assays, bile acid composition analysis, gene expression analysis Biochimica et biophysica acta. Molecular and cell biology of lipids Medium 38086439
2025 During cytomegalovirus infection, WASHC1 is recruited to Rab10-positive tubular membrane machinery that drives membrane tubulation; increased ubiquitination of WASHC1 is consistent with ubiquitin-dependent rheostatic control of membrane tubulation. siRNA depletion, immunofluorescence, HA-ubiquitin inducible cell line, Western blot in MCMV-infected cells Life (Basel, Switzerland) Low 40868860
2026 p300-dependent histone H3K18 lactylation transcriptionally upregulates WASHC1; WASH1 protein then binds the ubiquitin-associated domain of p62, impairing recognition and clearance of damaged mitochondria and suppressing mitophagy, thereby sustaining mitochondrial ROS accumulation and promoting apoptosis in prolactinoma cells. CUT&Tag, ChIP-qPCR, co-immunoprecipitation, GST pull-down, genetic manipulation, flow cytometry Redox biology Medium 41740506
2015 Strumpellin (WASH complex subunit) interacts with spartin (another HSP protein) in an interaction that is independent of WASH1, as spartin is not co-immunoprecipitated with WASH1; knockdown of strumpellin in cortical neurons reduces expression of WASH1 protein, and proteasomal inhibition stabilizes WASH1 protein levels, indicating WASH1 stability is proteasome-dependent. Co-immunoprecipitation, Western blot, siRNA knockdown in neurons, proteasomal inhibition assay Journal of experimental neuroscience Low 25987849

Source papers

Stage 0 corpus · 23 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2010 The cargo-selective retromer complex is a recruiting hub for protein complexes that regulate endosomal tubule dynamics. Journal of cell science 204 20923837
2017 Cellular functions of WASP family proteins at a glance. Journal of cell science 157 28646090
2020 SARS-CoV-2 growth, furin-cleavage-site adaptation and neutralization using serum from acutely infected hospitalized COVID-19 patients. The Journal of general virology 110 32821033
2014 Missense variant in CCDC22 causes X-linked recessive intellectual disability with features of Ritscher-Schinzel/3C syndrome. European journal of human genetics : EJHG 45 24916641
2019 The hepatic WASH complex is required for efficient plasma LDL and HDL cholesterol clearance. JCI insight 33 31167970
2014 WASH complex regulates Arp2/3 complex for actin-based polar body extrusion in mouse oocytes. Scientific reports 25 24998208
2019 Investigating the genetic determination of clutch traits in laying hens. Poultry science 23 30101314
2021 The Bardet-Biedl syndrome complex component BBS1 controls T cell polarity during immune synapse assembly. Journal of cell science 14 34423835
2018 Wash exhibits context-dependent phenotypes and, along with the WASH regulatory complex, regulates Drosophila oogenesis. Journal of cell science 11 29549166
2020 SARS-CoV-2 growth, furin-cleavage-site adaptation and neutralization using serum from acutely infected, hospitalized COVID-19 patients. bioRxiv : the preprint server for biology 8 32607507
2024 The T2T-CHM13 reference assembly uncovers essential WASH1 and GPRIN2 paralogues. Bioinformatics advances 7 38464973
2021 Tubular microdomains of Rab7-positive endosomes retrieve TrkA, a mechanism disrupted in Charcot-Marie-Tooth disease 2B. Journal of cell science 6 34486665
2020 Genome-scale CRISPR screening for potential targets of ginsenoside compound K. Cell death & disease 6 31959745
2018 Homologue-specific chromosome sequencing characterizes translocation junctions and permits allelic assignment. DNA research : an international journal for rapid publication of reports on genes and genomes 6 29518182
2017 Genetic analysis of VCP and WASH complex genes in a German cohort of sporadic ALS-FTD patients. Neurobiology of aging 6 28551275
2024 Deciphering the toxicity of polyhexamethylene guanidine phosphate in lung carcinogenesis: Mutational profiles and molecular mechanisms. Chemosphere 4 39577803
2015 Strumpellin and Spartin, Hereditary Spastic Paraplegia Proteins, are Binding Partners. Journal of experimental neuroscience 3 25987849
2022 WASHC1 interacts with MCM2-7 complex to promote cell survival under replication stress. Molecular biology reports 2 35733063
2023 Identification of Genetic Risk Factors for Keratinocyte Cancer in Immunosuppressed Solid Organ Transplant Recipients: A Case-Control Study. Cancers 1 37444464
2026 p300-mediated histone H3K18 lactylation promotes mitochondrial ROS accumulation via mitophagy inhibition to potentiate dopamine agonists efficacy in prolactinomas. Redox biology 0 41740506
2025 Ubiquitination Regulates Reorganization of the Membrane System During Cytomegalovirus Infection. Life (Basel, Switzerland) 0 40868860
2023 Lost in the WASH. The functional human WASH complex 1 gene is on chromosome 20. bioRxiv : the preprint server for biology 0 37398104
2023 Changes in bile acid composition are correlated with reduced intestinal cholesterol uptake in intestine-specific WASH-deficient mice. Biochimica et biophysica acta. Molecular and cell biology of lipids 0 38086439