FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\btnr3
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General Information
Symbol
Dmel\btnr3
Species
D. melanogaster
Name
FlyBase ID
FBal0039189
Feature type
allele
Associated gene
Dmel\btn
Associated Insertion(s)
Carried in Construct
Key Links
Allele class

amorphic allele - genetic evidence

Mutagen
Nature of the Allele
Allele class

amorphic allele - genetic evidence

(Chiang et al., 1994)
Mutagen
Delta2-3 transposase
(Chiang et al., 1994)
Progenitor genotype
P{rib7}Efa694B
(Chiang et al., 1994)
Cytology
Description

Deletion from P element site of insertion (coordinate 0) to +3.2kb, including the entire btn coding region.

(Chiang et al., 1994)
Mutations Mapped to the Genome
Curation Data
Type
Location
Additional Notes
References
Variant Molecular Consequences
Associated Sequence Data
DDBJ / EMBL / GenBank
DNA sequence
Protein sequence
 
UniProtKB/Swiss-Prot
    UniProtKB/TrEMBL
      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

      larval thoracic perisympathetic organ

      (Chiang et al., 1994)

      larval transverse nerve

      (Chiang et al., 1994)

      transverse nerve & mesothoracic segment

      (Chiang et al., 1994)

      transverse nerve & metathoracic segment

      (Chiang et al., 1994)

      transverse nerve & prothoracic segment

      (Chiang et al., 1994)
      Detailed Description
      Statement
      Reference

      Dorsal median cells are completely absent. Transverse nerves are not present in btn mutant embryos at stage 14. By stage 16 abnormally long and thick axon bundles extend along the midline at the dorsal surface of the VNC.

      (Chiang et al., 1994)
      External Data
      Interactions
      Show genetic interaction network for Enhancers & Suppressors
      Phenotypic Class
      Phenotype Manifest In
      Additional Comments
      Genetic Interactions
      Statement
      Reference
      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
      btn
      (Chiang et al., 1994)
      btnR3
      (Luer et al., 1997)
      btnr3
      Name Synonyms
      Secondary FlyBase IDs
        References (2)