FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\chbEP3403
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General Information
Symbol
Dmel\chbEP3403
Species
D. melanogaster
Name
FlyBase ID
FBal0118303
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
EP(3)3403
Key Links
Genomic Maps

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

The orientation of the P{EP} element is the same as the direction of chb transcription.

The P{EP} insertion maps to the 5' end of the long chb transcription unit, 2317bp upstream of the predicted ATG.

Allele components
Component
Use(s)
Mutations Mapped to the Genome
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

Embryos expressing chbEP3403 under the control of Scer\GAL4elav.PLu show a low but significant number of axons ectopically crossing the midline.

Mutant larvae expressing chbEP3403 under the control of Scer\GAL4elav-C155 have reduced or abnormal synapses. Mutant larvae expressing chbEP3403 under the control of Scer\GAL4elav-C155 have ISN neuron pathfinding defects.

Mutant larval brains have a mitotic index significantly higher than wild-type, (1.94 compared to 1.14), the majority of cells are arrested in metaphase or prometaphase, polyploid cells, cells with abnormal anaphases and circular mitotic figures are also seen.

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

Co-expression of chbEP3403 and AblScer\UAS.cFa under the control of Scer\GAL4elav.PLu in embryos results in an increased frequency of axons ectopically crossing the midline compared to embryos expressing either chbEP3403 or AblScer\UAS.cFa singly under the control of Scer\GAL4elav.PLu. Co-expression of chbEP3403 enhances the expressivity of the ISNb axons phenotype caused by expression of AblScer\UAS.cFa under the control of Scer\GAL4elav.PLu, although the effect is subtle.

Strong enhancer of ksr::torΔNksr.hs.sev and moderate suppressor of Ras85DV12.sev, when expression is driven by Scer\GAL4hs.2sev.

Xenogenetic Interactions
Statement
Reference

The rough eye phenotype caused by expression of Hsap\MAPTV337M.Scer\UAS under the control of Scer\GAL4GMR.PF is enhanced by chbEP3403.

Complementation and Rescue Data
Comments
Images (0)
Mutant
Wild-type
Stocks (0)
Notes on Origin
Discoverer
Comments
Comments

The effects on viability, mitotic phenotype and mitotic progression suggest an allelic series: chbEP3515 < chbv40 < chbEP3403 < chbP4.

Precise excision of the P{EP} element reverts the modifying effect of chbEP3403 on the rough eye phenotype caused by expression of Hsap\MAPTV337M.Scer\UAS under the control of Scer\GAL4GMR.PF.

External Crossreferences and Linkouts ( 2 )
Crossreferences
GenBank Nucleotide - A collection of sequences from several sources, including GenBank, RefSeq, TPA, and PDB.
GenBank Protein - A collection of sequences from several sources, including translations from annotated coding regions in GenBank, RefSeq and TPA, as well as records from SwissProt, PIR, PRF, and PDB.
Synonyms and Secondary IDs (3)
Reported As
Symbol Synonym
chbEP3403
Name Synonyms
Secondary FlyBase IDs
    References (6)