FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\Ninnull.R
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General Information
Symbol
Dmel\Ninnull.R
Species
D. melanogaster
Name
FlyBase ID
FBal0346145
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Key Links
Genomic Maps

Nature of the Allele
Progenitor genotype
Associated Insertion(s)
Cytology
Description

All Bsg25D protein coding sequence has been deleted. The following sequence (derived from the pTV[Cherry]-based donor) has been inserted in place of the deleted Bsg25D sequence: a single attP site and a loxP cassette which itself contains an mFRT71 cassette followed by Scer\GAL4 coding sequence and a polyadenylation signal (this GAL4 sequence is non-functional). The mFRT71 cassette contains 1: the mCherry coding region tagged with a membrane-targeting signal (Tag:Myr(Unk)) and followed by a polyadenylation signal, 2: a w+* marker.

Allele components
Component
Use(s)
Inserted element
Encoded product / tool
Mutations Mapped to the Genome
Curation Data
Type
Location
Additional Notes
References
Comment:

The Bsg25D protein sequence has been deleted and replaced with a pTV[Cherry]-based sequence (see allele description).

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
Detailed Description
Statement
Reference

Bsg25Dnull.R maternal-zygotic mutants show a modest decrease in survival to adulthood compared to controls but adults are fertile; third instar larvae crawl lower distances than controls.

Bsg25Dnull.R homozygous stage 16 embryo myotubes exhibit apparently normal nuclear spread and positioning; the microtubule organization is apparently normal. The same is observed in larval muscles.

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
Phenotype Manifest In
Suppressed by
Statement
Reference
NOT Enhancer of
Additional Comments
Genetic Interactions
Statement
Reference

The progeny from the cross between Bsg25Dnull.R/Bsg25Dnull.R fathers and either Bsg25Dnull.R/Bsg25Dnull.R, ensswo/+ or Bsg25Dnull.R/Df(2L)BSC693, ensswo/+ mothers is embryonic or larval lethal; progeny from the reciprocal cross does not show any major viability defects, as compared to controls. The lethality of the former is rescued by one copy of Dp(2;3)GV-CH321-49G22.

Bsg25Dnull.R/Bsg25Dnull.R, ensswo/+ and Bsg25Dnull.R/Df(2L)BSC693, ensswo/+ stage 16 embryos exhibit a small but significantly higher frequency of nucleus positioning defects in myotubes as compared to ensswo/+ individuals: nucleus clusters traverse less of the distance toward the muscle poles; in some myotubes, myonuclei are present as one cluster. The nucleus positioning defects of the former individuals are partially rescued by one copy of Dp(2;3)GV-CH321-49G22.

Bsg25Dnull.R, ensswo double homozygous stage 16 embryos exhibit the same severe myotube nucleus clustering as observed in ensswo single homozygotes.

Both Bsg25Dnull.R/Bsg25Dnull.R, Khc8/+ and Bsg25Dnull.R/Bsg25Dnull.R, Dhc64C4-19/+ stage 16 embryo myotubes present normal nuclear positioning.

Xenogenetic Interactions
Statement
Reference
Complementation and Rescue Data
Comments
Images (0)
Mutant
Wild-type
Stocks (0)
Notes on Origin
Discoverer
External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (3)
Reported As
Symbol Synonym
Bsg25Dnull.R
Bsg25Dnull
Ninnull.R
Name Synonyms
Secondary FlyBase IDs
    References (1)