FB2024_03 , released June 25, 2024
Allele: Dmel\snsXB3
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General Information
Symbol
Dmel\snsXB3
Species
D. melanogaster
Name
FlyBase ID
FBal0117349
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Key Links
Genomic Maps

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

Nucleotide substitution: G?A. The lesion creates a novel 3' splice acceptor site within an intron and leads to incorrect splicing of the transcript, which introduces a stop codon 67bp from the splice junction.

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

G8830819A

Reported nucleotide change:

G?A

Comment:

The mutation creates a novel 3' splice acceptor site within an intron and leads to incorrect splicing of the transcript, which introduces a stop codon 67bp from the splice junction.

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 ( 1 )
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
Detailed Description
Statement
Reference

Mutant stage 16 embryos show a severe myoblast fusion defect in the dorsal pharyngeal muscle.

The eve-expressing DA1 founder cell, the Kr-expressing DO1 founder cell, and the nau-expressing VA1 founder cell undergo limited fusion in snsXB3 embryos to generate bi- or tri-nucleate syncitia.

Mutant embryonic garland cells lack diaphragms and lacunae, and instead the nephrocyte surface contains frequent, small patches of electron-dense subcortical material.

snsXB3 embryos do not exhibit actin foci in founder cell-fusion competent myoblast development, leading to defects in fusion.

The extent of myoblast fusion in snsXB3 mutant embryos is significantly reduced compared to wild type.

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
Phenotype Manifest In
Additional Comments
Genetic Interactions
Statement
Reference

There is a lower number of eve-expressing DA1 founder cells, Kr-expressing DO1 founder cells, and nau-expressing VA1 founder cells in snsXB3 hbs2593 double mutant embryos than in snsXB3 embryos - these founder cells remain mononucleate in most hemi-segments.

snsXB3, hbs2593 / snsD1, hbs459 embryos have a relatively low number of eve-expressing DA1 founder cells - fewer than in snsXB3 embryos.

The limited number of unfused myoblasts in hbs2593/hbs459 embryos increases when embryos are also heterozygous for snsXB3.

Scer\GAL4Mef2.PR-mediated expression of sns20-5.Scer\UAS.T:Ivir\HA1 or hbsΔICD.Scer\UAS.T:Ivir\HA1 fails to rescue formation of eve-positive DA1 or Kr-positive DO1 bi- and tri-nucleate muscle precursors in snsXB3, hbs2593 double mutant embryos.

Almost 60% of garland cell nephrocytes (GCNs) remain mononucleate at early stage 16 in snsXB3 hbs2593 double mutant embryos (in contrast to wild-type embryos where 99.6% of the GCNs are binucleate at this stage). The GCNs of stage 16 snsXB3 hbs2593 double mutant embryos are disorganised, misshapen and more loosely associated than in wild-type embryos.

The extent of myoblast fusion in hbs2593; snsXB3 embryos is significantly reduced compared to wild type.

Expression of Fas1::snsGPI.Scer\UAS under the control of Scer\GAL4how-24B fails to rescue the mutant phenotype of snsZF1.4/snsXB3 embryos. Fusion competent myoblasts do not appear to migrate towards the founder cells in these embryos.

Both the gut and the somatic mesoderm phenotypers seen in hbs459/hbs2593 embryos are suppressed by the addition of snsXB3.

Xenogenetic Interactions
Statement
Reference
Complementation and Rescue Data
Fails to complement
Comments
Images (0)
Mutant
Wild-type
Stocks (1)
Notes on Origin
Discoverer
External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (1)
References (14)