FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\fest1
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General Information
Symbol
Dmel\fest1
Species
D. melanogaster
Name
FlyBase ID
FBal0316827
Feature type
allele
Associated gene
Dmel\fest
Associated Insertion(s)
Carried in Construct
Key Links
Genomic Maps

Allele class
Mutagen
Nature of the Allele
Allele class
Mutagen
CRISPR/Cas9
(Baker et al., 2015)
Progenitor genotype
Cytology
Description

8 nucleotide deletion starting 25 nucleotides into the fest coding sequence. This is predicted to result in a premature stop codon after only 8 amino acids.

(Baker et al., 2015)
Mutations Mapped to the Genome
Curation Data
Type
Location
Additional Notes
References
deletion
2R:19,342,108..19,342,115 [+]
Comment:

8 nucleotide deletion starting 25 nucleotides into the fest coding sequence. This is predicted to result in a premature stop codon after only 8 amino acids.

(Baker et al., 2015)
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

      fest1/Df(2R)BSC26 males show a germ cell arrest phenotype; the testes are half-filled with small, sausage-shaped cells and no sperm or elongating spermatids are seen. The mutant spermatocytes appear to arrest prior to meiosis I metaphase; bivalent chromosomes are seen paired, tightly condensed and congressed near the centre of the cell but prometaphase asters and metaphase spindles are never formed. The mutant spermatocytes instead contain a diffuse microtubule array which eventually becomes dense and disorganised, filling the cells and compressing the arrested nuclear material.

      (Baker et al., 2015)
      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 (1)
      Reported As
      Symbol Synonym
      fest1
      (Fingerhut et al., 2019)
      Name Synonyms
      Secondary FlyBase IDs
        References (2)