FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\futschN94
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General Information
Symbol
Dmel\futschN94
Species
D. melanogaster
Name
FlyBase ID
FBal0118230
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Key Links
Mutagen
    Nature of the Allele
    Mutagen
    Progenitor genotype
    Cytology
    Description
    Mutations Mapped to the Genome
    Curation Data
    Type
    Location
    Additional Notes
    References
    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 ( 1 )
    Disease
    Interaction
    References
    Comments on Models/Modifiers Based on Experimental Evidence ( 0 )
     
    Disease-implicated variant(s)
     
    Phenotypic Data
    Phenotypic Class
    Phenotype Manifest In
    Detailed Description
    Statement
    Reference

    In futschN94/futschN94 embryos the axons of ap-expressing neurons are mildly disorganized, with no impact on the overall organization of the Fas2-immunopositive scaffold.

    futschN94 mutant pupae prune all ddaC dendrites by 16 h after puparium formation (APF), similar to controls.

    The third instar larval neuromuscular junctions of futschN94 heterozygotes display a significant decrease in the number, and a significant increase in the size, of terminal boutons, as compared to controls.

    No defects in microtubule stability are observed in the distal boutons of the futschN94 mutant NMJ.

    futschN94 heterozygotes exhibit wild-type synaptic differentiation.

    futschN94 mutants exhibit a reduction in synaptic mitochondria.

    There is a decrease in the number of synaptic boutons at the neuromuscular junction in mutant third instar larvae.

    futschN94 mutants display a 20% decrease in the number of boutons in larval neuromuscular junctions and a decrease in the number of "satellite" boutons, defined as boutons that are present in the axon of a branch or that bud off from neuronal connections between two boutons.

    Mutants show no circadian defect detectable with actograms.

    Phenotype is similar to that of Fmr1 gain of function mutants - reduced neuromuscular junction growth with decreased synaptic area, branching and bouton number. Neurotransmission at the NMJ is elevated, and in the photoreceptor is depressed.

    In futschN94 homozygotes, synaptic microtubules no longer form a filamentous cytoskeletal shaft that runs through the nerve terminal, and microtubule loop formation is absent. There is also a reduction in bouton number and an increase in bouton size (bouton sizes increase over two-fold). Bouton number is reduced from an average of 64.8 boutons at muscle 4 in wild-type to 40.8 in mutants. Also mutant nerve-terminals at muscle 4 rarely have branch-points. In futschN94 heterozygotes, a small but statistically significant reduction of numbers of boutons (about 51.2 at muscle 4). No change in muscle size is seen in these mutants.

    External Data
    Interactions
    Show genetic interaction network for Enhancers & Suppressors
    Phenotypic Class
    NOT Enhanced by
    Statement
    Reference

    futschN94 has abnormal neuroanatomy | dominant phenotype, non-enhanceable by NaPi-III21-4/NaPi-III[+]

    futschN94 has abnormal size | dominant phenotype, non-enhanceable by NaPi-III21-4/NaPi-III[+]

    futschN94 has abnormal neuroanatomy | dominant phenotype, non-enhanceable by NaPi-III15-1/NaPi-III[+]

    futschN94 has abnormal size | dominant phenotype, non-enhanceable by NaPi-III15-1/NaPi-III[+]

    Suppressed by
    Statement
    Reference
    Enhancer of
    Statement
    Reference

    futschN94/futsch[+] is an enhancer of abnormal neuroanatomy | dominant phenotype of NaPi-III21-4

    futschN94/futsch[+] is an enhancer of abnormal size | dominant phenotype of NaPi-III21-4

    futschN94/futsch[+] is an enhancer of abnormal neuroanatomy | dominant phenotype of NaPi-III15-1

    futschN94/futsch[+] is an enhancer of abnormal size | dominant phenotype of NaPi-III15-1

    NOT Enhancer of
    Statement
    Reference

    futschN94 is a non-enhancer of semi-sterile phenotype of Fmr1Δ50M

    Suppressor of
    Statement
    Reference

    futschN94/futsch[+] is a suppressor of abnormal neuroanatomy phenotype of NFATEP19579

    futschN94/futsch[+] is a suppressor of abnormal neuroanatomy phenotype of NFATEP1508

    futschN94/futsch[+] is a suppressor of abnormal neuroanatomy phenotype of Lrrke03680

    NOT Suppressor of
    Statement
    Reference

    futschN94 is a non-suppressor of semi-sterile phenotype of Fmr1Δ50M

    Phenotype Manifest In
    NOT Enhanced by
    Suppressed by
    Statement
    Reference

    futschN94 has bouton phenotype, suppressible by Fmr1Δ50M

    futschN94 has synapse phenotype, suppressible by Fmr1Δ50M

    NOT suppressed by
    Enhancer of
    Suppressor of
    Statement
    Reference

    futschN94/futsch[+] is a suppressor of ommatidium | adult stage phenotype of ND-42ninaE.GD6220

    futschN94/futsch[+] is a suppressor of microtubule phenotype of foxo21

    futschN94/futsch[+] is a suppressor of synapse phenotype of NFATEP1508, Scer\GAL4Toll-6-D42

    futschN94/futsch[+] is a suppressor of synapse phenotype of NFATEP19579, Scer\GAL4Toll-6-D42

    futschN94/futsch[+] is a suppressor of neuromuscular junction phenotype of Lrrke03680

    futschN94/futsch[+] is a suppressor of NMJ bouton phenotype of Lrrke03680

    futschN94 is a suppressor of bouton phenotype of Fmr1Δ50M

    futschN94 is a suppressor of synapse phenotype of Fmr1Δ50M

    NOT Suppressor of
    Other
    Additional Comments
    Genetic Interactions
    Statement
    Reference

    The decreased number and increased size of terminal boutons in third instar larval neuromuscular junctions of NaPi-III21-4, futschN94 and NaPi-III15-1, futschN94 double heterozygotes is similar to NaPi-III21-4 single heterozygotes and enhanced compared to futschN94 single heterozygotes.

    A futschN94 background dominantly suppresses the elevated number of microtubule loops present in foxo21 mutants.

    A futschN94 heterozygous background restores normal synaptic length when NFATEP1508 is expressed under the control of Scer\GAL4D42.

    A futschN94 heterozygous background restores normal synaptic length when NFATEP19579 is expressed under the control of Scer\GAL4D42.

    One copy of futschN94 prevents expression of TBPHScer\UAS.T:Zzzz\FLAG under the control of Scer\GAL4elav.PU from rescuing the reduction in bouton number and terminal branches seen in muscles 6 and 7 of homozygous TBPHΔ23 third instar larvae. futschN94/+ also prevents TBPHScer\UAS.T:Zzzz\FLAG from restoring microtubule stability in the TBPHΔ23 mutant flies.

    Removal of futsch activity in a heterozygous futschN94 background rescues the synaptic overgrowth phenotype found in Lrrke03680 heterozygotes.

    Expression of sggA81T.Scer\UAS under the control of Scer\GAL4OK6, in a futschN94 background suppresses the increased larval neuromuscular bouton number phenotype, seen when sggA81T.Scer\UAS is expressed in a wild-type background. The phenotype is nearer to that seen in futschN94 single mutants, although the bouton number is not decreased as much.

    Xenogenetic Interactions
    Statement
    Reference
    Complementation and Rescue Data
    Images (0)
    Mutant
    Wild-type
    Stocks (1)
    Notes on Origin
    Discoverer
    External Crossreferences and Linkouts ( 0 )
    Synonyms and Secondary IDs (1)
    References (24)