FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Aberration: Dmel\Df(2L)pr-A20
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General Information
Symbol
Df(2L)pr-A20
Species
D. melanogaster
Name
Deficiency (2L) purple
FlyBase ID
FBab0001870
Feature type
chromosomal_deletion
Computed Breakpoints include

38A1;38B6-38C1

Features within 38A1--38C1
Sequence coordinates
Member of large scale dataset(s)
Nature of Aberration
Cytological Order
Progenitor
Mutagen
X ray
(Ganetzky, 1977)
Class of aberration (relative to wild type)
chromosomal_deletion
(FlyBase, 2007)
Class of aberration (relative to progenitor)
chromosomal_deletion
(Alphey et al., 1997, Molina et al., 1997, Pentz et al., 1990)
Breakpoints

38A3-38A4;38B6-38C1

(Alphey et al., 1997, Molina et al., 1997, Pentz et al., 1990)
Causes alleles
Carries alleles
Transposon Insertions
Formalized genetic data

l(2)37Fg << bk1 << Lar << tyr1 << bk2 << ms(2)38C

Genetic mapping information
Comments
Comments on Cytology

Left limit of break 1 from non-inclusion of l(2)37Fg (citation unavailable) Right limit of break 1 from inclusion of Lar (FBrf0086508) Limits of break 2 from polytene analysis (FBrf0051216)

Sequence Crossreferences
DDBJ / EMBL / GenBank
DNA sequence
Protein sequence
Gene Deletion and Duplication Data
Genes Deleted / Disrupted
Genes NOT Deleted / Disrupted
Genes Duplicated
Complementation Data
Completely duplicated
Partially duplicated
Molecular Data
Completely duplicated
Partially duplicated
Genes NOT Duplicated
Complementation Data
 
Molecular Data
 
Affected Genes Inferred by Location (0)
    If no genes are listed here, it may be because the affected region is very large. The JBrowse insert above may show an error for the same reason, and other FlyBase tools such as CytoSearch may also fail for large regions. You can contact FlyBase for more help.
    In these cases, there will be no "Export to Hitlist" button to the left.
    Phenotypic Data
    In combination with other aberrations
    NOT in combination with other aberrations
    Stocks (2)
    Notes on Origin
    Discoverer
     
    Balancer / Genotype Variants of the Aberration
     
    Separable Components
     
    Other Comments
     

    The Df(2L)pr-A20 chromosome acts as a dominant weak suppressor of telomeric silencing (assayed using the effect of the chromosome on the eye colour phenotype of flies carrying "P{wvar}KR3-2", a stable "brown-red" variant of the P{3'WP-2,wvar}2Lt insertion), but this is a false positive result (the suppressor is not within the bounds of the deficient region) because the region of the deficiency is covered by one or more nonsuppressing deficiencies.

    (Mason et al., 2004)
    Synonyms and Secondary IDs (6)
    Reported As
    Symbol Synonym
    A20
    (Ganetzky, 1977)
    Df(2L)A20
    Df(2L)pr-A20
    (Crest et al., 2007, Kuranaga et al., 2006)
    Df(2L)prA20
    (Molina et al., 1997)
    Df(2L)prA20
    (Krueger et al., 1996)
    Name Synonyms
    Deficiency (2L) purple
    Secondary FlyBase IDs
      References (14)