FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\snBL4
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General Information
Symbol
Dmel\snBL4
Species
D. melanogaster
Name
FlyBase ID
FBal0062454
Feature type
allele
Associated gene
Dmel\sn
Associated Insertion(s)
P{}snBL4
Carried in Construct
Also Known As
loua sn4
Key Links
Allele class
Mutagen
Nature of the Allele
Allele class
Mutagen
PM hybrid dysgenesis
(Brookfield and Lewis, 1989, Brookfield and Mitchell, 1985)
Progenitor genotype
Associated Insertion(s)
P{}snBL4
Cytology
Description

Insertion of a P-element.

(Brookfield and Lewis, 1989)
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
      Detailed Description
      Statement
      Reference

      Male flies can show mosaicism, having areas of cuticle that are wild-type for sn.

      (Brookfield and Lewis, 1989)
      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
      Comments
      Comments

      Generated using the Loua 83 P-strain. Unstable allele, reverting either to wild-type or a weaker sn phenotype. The reversion rate is 0.92%. The revertant alleles are dominant over the progenitor snBL4 allele.

      (Brookfield and Mitchell, 1985)

      The alleles snBL4, snBL6 and snBL8 may be derived from a single premeiotic event. Appreciable somatic reversion of this allele, generating mosaics having patches of cuticle with a wild-type phenotype, is seen. The rate of somatic reversion is 1.85%. The movements of the P-elements in these somatic reversions occur early in development, and require a trans-acting maternal effect component (P\TMo). Somatic reversion occurs preferentially in attached-X stocks.

      (Brookfield and Lewis, 1989)
      External Crossreferences and Linkouts ( 0 )
      Synonyms and Secondary IDs (3)
      Reported As
      Symbol Synonym
      LOUA sn4
      (Brookfield and Mitchell, 1985)
      loua sn4
      (Brookfield and Lewis, 1989)
      snBL4
      Name Synonyms
      Secondary FlyBase IDs
        References (2)