FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\WASp1
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General Information
Symbol
Dmel\WASp1
Species
D. melanogaster
Name
FlyBase ID
FBal0121875
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
wsp1
Key Links
Genomic Maps

Allele class
Mutagen
    Nature of the Allele
    Allele class
    Mutagen
    Progenitor genotype
    Cytology
    Description

    A 34 nucleotide deletion between positions 24652161-24652128 on arm 3R of genome sequence release 4.3. Missing sequence is: aacgacgaagtgctgaacgagttcttcgtgaagg. This deletion results in a frameshift after residue Glu-260 of the protein and termination after 8 additional residues.

    Small intragenic deletion resulting in a predicted frameshift which causes the cytoskeleton-interacting carboxy-terminal domain to be lost.

    Mutations Mapped to the Genome
    Curation Data
    Type
    Location
    Additional Notes
    References
    Comment:

    WASp[1]- A 34 nt deletion within WASp. The missing sequence is: aacgacgaagtgctgaacgagttcttcgtgaagg. The deletion results in a frameshift after residue Glu-260 of the protein and early translation termination after the addition of 7 novel amino acids.

    Variant Molecular Consequences
    Associated Sequence Data
    DNA sequence
    Protein sequence
     
    Expression Data
    Reporter Expression
    Additional Information
    Statement
    Reference
     
    Marker for
    Reflects expression of
    Reporter construct used in assay
    Human Disease Associations
    Disease Ontology (DO) Annotations
    Models Based on Experimental Evidence ( 0 )
    Disease
    Evidence
    References
    Modifiers Based on Experimental Evidence ( 0 )
    Disease
    Interaction
    References
    Comments on Models/Modifiers Based on Experimental Evidence ( 0 )
     
    Disease-implicated variant(s)
     
    Phenotypic Data
    Phenotypic Class
    Phenotype Manifest In

    adult thorax & microchaeta (with Df(3R)3450)

    interommatidial bristle & eo neuron | supernumerary (with Df(3R)3450)

    interommatidial bristle & tormogen cell (with Df(3R)3450)

    interommatidial bristle & trichogen cell (with Df(3R)3450)

    leg & microchaeta (with Df(3R)3450)

    macrochaeta & adult head | somatic clone

    microchaeta & adult head | somatic clone

    Detailed Description
    Statement
    Reference

    Bouton numbers are unaffected at the NMJ of WASp1/+ third instar larvae.

    Isolated pupal macrophages (plated on cover slips) deficient of WASp1/Df(3R)3450 do not show defects in hemocyte size.

    WASp1/Df(3R)3450 or WASp1/WASp1 survive until early adulthood, though many flies fail to fully eclose from the pupal case.

    WASp1/Df(3R)3450 newly eclosed flies have significantly fewer macrochaetes on the head and thorax compared to wild type. WASp1/Df(3R)3450 pupal (24h APF) notae have a significantly increased number of neurons per sensory organ.

    WASp1/WASp1 newly eclosed flies have significantly fewer macrochaetes on the head compared to wild type and late stage embryos show attachment defects of lateral transverse muscles.

    Mutant larvae do not show dorsal closure defects.

    WASp1/Df(3R)3450 do not show a kinked microchaete phenotype.

    Minor shape abnormalities are seen in the rhabdomeres of WASp1/Df(3R)3450 mutant adult eye clones. However rhabdomere extension occurs normally and the underlying fenestrated membrane is intact. Retina depth and external morphology are also normal. Many of the interommatidial bristles are missing.

    As in wild type, flies expressing WASpScer\UAS.cBa under the control of Scer\GAL4arm.PS in a WASp1/Df(3R)3450 mutant background display elongated cysts and a seminal vesicle that is full of individualised, mature sperm.

    Flies expressing WASpH242D.Scer\UAS under the control of Scer\GAL4arm.PS in a WASp1/Df(3R)3450 mutant background display similarly elongated cysts to wild type, but no sperm is released into the seminal vesicle. Coiling of the cysts does not take place, and the extreme basal end of the testis tube, lined by the terminal epithelium and leading up to the seminal vesicle, is free of cysts altogether. Sperm individualisation in these mutants proceeds normally. The microfilaments and nuclei of late-stage cysts show significant structural alterations. There is a consistent failure to achieve the intertwined and tightly packed organisation of head cyst cell F-actin arrays and associated spermatid nuclei. The microfilament arrays appear sparse and misshapen, and the normally tight and uniformly oriented bundles of nuclei are loosely packed and partially split.

    WASp1/Df(3R)3450 third instar larvae exhibit neuromuscular junction overgrowth.

    WASp1/Df(3R)3450 third instar larvae exhibit reduced vesicle cycling (reduced uptake of FM 1-43 dye) compared to controls.

    Third instar WASp1/Df(3R)3450 larvae show an increase in bouton number/muscle area and satellite bouton number at the neuromuscular junction compared to wild type.

    WASp1 heterozygous neuromuscular junctions do not exhibit any morphological changes.

    Muscle pattern in WASp1 maternal/zygotic embryos are severely disrupted. A prominent feature is groups of mononucleated myoblasts clustered around thin, abnormally elongated fibers, suggesting WASp is required for myoblast fusion during embryonic myogenesis.

    WASp1 maternal/zygotic embryos display 2-3 DA1 nuclei per segment, implying that fusion is arrested after a single round of founder cell-fusion-competent myoblasts, generating a bi-/trinucleated myotube precursor.

    WASp1 homozygous embryos do not show a myoblast fusion phenotype.

    WASp3D3-035/WASp1 transheterozygotes exhibit a myoblast fusion phenotype.

    WASp1/Df(3R)3450 mutants loss of sensory organ precursor cells in the wing imaginal disc.

    Occasional escapers survive to the pharate adult stage. Homozygous and hemizygous larvae show defects at the neuromuscular junction; bouton number, branch number, total NMJ length and hyperbranching of boutons are all increased compared to wild type. Heterozygotes show a low incidence of hyperbranching of boutons at the larval NMJ.

    WASp1/WASp3 transheterozygotes survive to pharate adults. In these flies, many rhabdomeres do not obtain the normal characteristic oval shape, but rather are pointed and squared, with 2-3% of the mutant rhabdomeres split.

    In WASp1/Df(3R)3450 mutants, interommatidial bristles are missing, along with nearly all bristles present on the dorsal aspect of the head in wild-type. However the ommatidial array is normal in these eyes.

    Hemizygotes complete nearly all stages of imaginal development and die as young adults, most commonly failing to eclose from the pupal case. Those that eclose can survive for a few days, but are lethargic and passive in their behaviour. WASp1/Df(3R)3450 flies show a pronounced lack of neurosensory bristles, particularly on the head capsule and abdomen. Significant, but less severe effects are also seen on the legs and thorax, where microchaetae are primarily affected. Loss of both the bristle shaft and bristle socket is seen (smooth cuticle phenotype) and occasionally, bristles are duplicated. Bristles that do form have normal morphology. Strong loss of interommatidial bristles is seen in WASp1/Df(3R)3450 flies, although the ordered spatial pattern of the eye facets is normal. Mutant pupae at 30 hours after puparium formation show an excess of neurons and a near absence of bristle shaft, socket and sheath cells in the developing retina.

    External Data
    Interactions
    Show genetic interaction network for Enhancers & Suppressors
    Phenotypic Class
    Enhanced by
    Statement
    Reference

    WASp1 has abnormal neuroanatomy phenotype, enhanceable by Cdc42[+]/Cip41/Cip4[+]/Cdc422

    WASp1 has abnormal neuroanatomy phenotype, enhanceable by nwk2

    Suppressed by
    Enhancer of
    Statement
    Reference

    WASp[+]/WASp1 is an enhancer of abnormal neuroanatomy phenotype of Cip41

    Cdc42[+], WASp[+], WASp1, Cdc422 is an enhancer of abnormal neuroanatomy phenotype of Cip41

    Cip41, WASp[+], WASp1, Cip4[+] is an enhancer of abnormal neuroanatomy phenotype of Cdc422

    WASp1 is an enhancer of abnormal neuroanatomy phenotype of nwk2

    Suppressor of
    Statement
    Reference
    Other
    Phenotype Manifest In
    Enhanced by
    Statement
    Reference

    WASp1 has NMJ bouton phenotype, enhanceable by Cip41/Cip4[+]

    WASp1 has neuromuscular junction phenotype, enhanceable by Cip41/Cip4[+]

    WASp1 has NMJ bouton phenotype, enhanceable by Cdc42[+]/Cip41/Cip4[+]/Cdc422

    WASp1 has neuromuscular junction phenotype, enhanceable by Cdc42[+]/Cip41/Cip4[+]/Cdc422

    WASp1 has bouton | increased number phenotype, enhanceable by nwk2

    WASp1 has bouton phenotype, enhanceable by nwk2

    Df(3R)3450/WASp1 has adult thorax & microchaeta phenotype, enhanceable by Nl1N-ts1

    NOT Enhanced by
    Suppressed by
    Enhancer of
    Statement
    Reference

    WASp[+]/WASp1 is an enhancer of neuromuscular junction phenotype of Cip41

    Cdc42[+], WASp[+], WASp1, Cdc422 is an enhancer of NMJ bouton phenotype of Cip41

    Cdc42[+], WASp[+], WASp1, Cdc422 is an enhancer of neuromuscular junction phenotype of Cip41

    Cip41, WASp[+], WASp1, Cip4[+] is an enhancer of NMJ bouton phenotype of Cdc422

    Cip41, WASp[+], WASp1, Cip4[+] is an enhancer of neuromuscular junction phenotype of Cdc422

    WASp[+]/WASp1 is an enhancer of NMJ bouton phenotype of Cip41

    WASp1 is an enhancer of bouton | increased number phenotype of nwk2

    WASp1 is an enhancer of bouton phenotype of nwk2

    NOT Enhancer of
    Suppressor of
    NOT Suppressor of
    Statement
    Reference
    Other
    Additional Comments
    Genetic Interactions
    Statement
    Reference

    Presence of WhamyΔ109/WhamyΔ109 enhances early adulthood lethality seen in in WASp1/WASp1, whereby double mutants are late-embryonic lethal with few larval escapers.

    WhamyΔ109/+ shifts lethality from late pupal or adult to early larval stages in WASp1/Df(3R)3450 transheterozygotes. WhamyΔ109/+ enhances the decrease of macrochaetes on the head and notum of WASp1/Df(3R)3450 immature adults and the increased number of neurons per sensory organ in WASp1/Df(3R)3450 (24h APF) pupal notae.

    Expression of WhamyScer\UAS.T:Avic\GFP-EGFP driven by Scer\GAL4sca.PU partially suppresses the loss of sensory macrochaetes from the heads of WASp1/WASp1 flies.

    WASp1/WASp1;WhamyΔ109/WhamyΔ109 double mutant stage 16 embryos have strong defects in muscle size and morphology, including a reduction in the number of nuclei contained in segmental border muscle (disturbed myoblast fusion). WASp1/WASp1;WhamyΔ109/WhamyΔ109 double mutant stage 11 embryos have similar numbers of founder cells compared to wild type.

    Heterozygosity for WASp1 does not suppress the split microchaete phenotype caused by expression of Abp1Scer\UAS.T:Myr-Src64B,T:Avic\GFP under the control of Scer\GAL4sca.PU.

    nwk1 enhances the overgrown neuromuscular junction phenotype seen in WASp1/Df(3R)3450 third instar larvae.

    WASp1/Df(3R)3450 enhances the overgrown neuromuscular junction phenotype seen in homozygous nwk1 third instar larvae.

    WASp1/Df(3R)3450 partially suppresses the small neuromuscular junction phenotype seen in witA12/witB11 mutants.

    Expression of tkvQ253D.Scer\UAS.cNb under the control of Scer\GAL4n-syb.PS does not enhance the neuromuscular junction overgrowth phenotype seen in WASp1/Df(3R)3450 third instar larvae.

    WASp1/Df(3R)3450 does not enhance the neuromuscular junction overgrowth phenotype seen in tweek1/tweek2 third instar larvae.

    The increase in bouton number/muscle area and satellite bouton number at the neuromuscular junction seen in third instar WASp1/Df(3R)3450 larvae is partially suppressed by RhoGAP92B1/RhoGAP92B2.

    The decrease in bouton number/muscle area and satellite bouton number at the neuromuscular junction which is seen in third instar RhoGAP92B1/RhoGAP92B2 larvae is significantly suppressed by WASp1/+.

    WASp1/Cip41 double heterozygotes exhibit an increase in total bouton number, satellite bouton formation and neuromuscular junction length.

    Cdc422/+; Cip41/+; WASp1/+ trans-heterozygous larvae exhibit an increase in total bouton number, neuromuscular junction length and in particular satellite bouton formation.

    WASp1 nwk2 double mutant larvae display more severe neuromuscular junction (NMJ) phenotypes than either single mutant with respect to bouton number, branch formation and NMJ length. The complexity of hyperbranching at the NMJ is also dramatically increased in the double mutants.

    In the ventral nerve cord of SCARK13811/+; WASp1/Df(3R)3450 embryos, breaks occur in both longitudinal and commissural axon bundles, and axons are medially displaced. In the ventral nerve cord of SCARK13811/SCARK13811; WASp1/+ embryos, there is an severe depletion of axons in both longitudinal and commissural bundles, often leading to gaps.

    WASp1/Df(3R)3450 Nl1N-ts1 flies show an enhancement of the WASp1/Df(3R)3450 bristle loss phenotype; the flies lack practically all bristles on regions of the cuticle such as the thorax. The loss of interommatidial bristles seen in WASp1/Df(3R)3450 flies is almost completely suppressed by H3. A significant restoration of the bristle pattern is seen in WASp1/Df(3R)3450 flies expressing Nint.hs, particularly in the abdomen. Large numb2 clones in the head of WASp1/Df(3R)3450 animals rarely show the numb2 multiple socket phenotype, while the WASp1/Df(3R)3450 smooth cuticle phenotype predominates, indicating that WASp is epistatic to numb.

    Xenogenetic Interactions
    Statement
    Reference

    Expression of Hsap\PLCD1PH.Scer\UAS.T:Avic\GFP-EGFP under the control of Scer\GAL4n-syb.PS does not enhance the neuromuscular junction overgrowth seen in WASp1/Df(3R)3450 third instar larvae.

    Expression of Hsap\PLCD1PH.S39R.Scer\UAS.T:Avic\GFP-EGFP under the control of Scer\GAL4n-syb.PS does not enhance the neuromuscular overgrowth seen in WASp1/Df(3R)3450 third instar larvae.

    Complementation and Rescue Data
    Fails to complement
    Partially rescued by
    Comments

    Expression of WASpScer\UAS.cBa under the control of Scer\GAL4n-syb.PS rescues the neuromuscular junction overgrowth seen in WASp1/Df(3R)3450 third instar larvae.

    Expression of WASpΔB.H242D.Scer\UAS under the control of Scer\GAL4n-syb.PS fails to rescue the neuromuscular junction overgrowth seen in WASp1/Df(3R)3450 third instar larvae.

    Expression of WASpΔB.Scer\UAS under the control of Scer\GAL4n-syb.PS fails to rescue the neuromuscular junction overgrowth seen in WASp1/Df(3R)3450 third instar larvae.

    Expression of WASpH242D.Scer\UAS under the control of Scer\GAL4n-syb.PS rescues the neuromuscular junction overgrowth seen in WASp1/Df(3R)3450 third instar larvae.

    Expression of WASp1/Df(3R)3450 does not enhance the enlarged neuromuscular junction phenotype seen when Hsap\PLCD1PH.Scer\UAS.T:Avic\GFP-EGFP is expressed under the control of Scer\GAL4n-syb.PS in homozygous nwk1 third instar larvae.

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    Mutant
    Wild-type
    Stocks (1)
    Notes on Origin
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    External Crossreferences and Linkouts ( 0 )
    Synonyms and Secondary IDs (6)
    References (27)