FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Aberration: Dmel\C(1)A
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General Information
Symbol
C(1)A
Species
D. melanogaster
Name
Compound (1) of Armentrout
FlyBase ID
FBab0000079
Feature type
homo_compound_chromosome
Computed Breakpoints include
Sequence coordinates
Member of large scale dataset(s)
Nature of Aberration
Cytological Order

| 1A - 6F2 | 6F2 - 1A | 20 - 7A1 | 7A1 - 20 . |

Progenitor
C(1)TR94
Mutagen
spontaneous
Class of aberration (relative to wild type)
homo_compound_chromosome
Class of aberration (relative to progenitor)
Breakpoints
Causes alleles
Carries alleles
y1
Transposon Insertions
Formalized genetic data
Genetic mapping information
Comments
Comments on Cytology

Ring shaped in mitotic metaphase.

Sequence Crossreferences
DDBJ / EMBL / GenBank
DNA sequence
Protein sequence
Gene Deletion and Duplication Data
Genes Deleted / Disrupted
Complementation Data
Completely deleted / disrupted
Partially deleted / disrupted
Molecular Data
Completely deleted
Partially deleted
Genes NOT Deleted / Disrupted
Complementation Data
 
Molecular Data
 
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.
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    Phenotypic Data
    In combination with other aberrations
    NOT in combination with other aberrations

    An apparently completely stable, compound-ring-X chromosome; cannot produce single-X chromosome derivative by heterochromatic exchange.

    Stocks (19)
    Notes on Origin
    Discoverer

    Armentrout, 1964.

     

    C(1)TR94 progenitor marked with y cv v sd . y sn g Apparently arose by a process describable as reversed crossing over in region 6F2 - 7A1. Current versions of this chromosome have apparently opened, since they are no longer ring-shaped in metaphase. Shown to have separated at 13E by Traverse and Pardue (1988, Proc. Nat. Acad. Sci. USA 85: 8116-20) such that the new order is 13E - 7A1 | 7A1 - 20.1 - 6F2 | 6F2 - 1 | 20 - 13E | 13E - 20.1 - 6F2 | 6F2 - 1 | 20 - 7A1 | 7A1 - 13E which are interconvertable by exchange between regions 20 and 13. The newly terminal ends at 13E have acquired moderately repeated sequences (He-T DNA) ordinarily encountered at telomeres and in the chromocenter (Traverse and Pardue). Transmission of C(1)A is reduced owing to the fact that half of meiotic exchanges lead to the production of dicentric chromosomes.

    Balancer / Genotype Variants of the Aberration
     
    Separable Components
     
    Other Comments
     

    The C(1)A chromosome has spontaneously opened in polytene region 13E to produce two new telomeres. Each of the new telomeres has acquired HeT-A DNA sequences.

    (Traverse and Pardue, 1988)

    Should be the best of all compound-X chromosomes for stock purposes. Probably originally heterozygous for cv1, sn1, v1, g1, and sd1.

    Synonyms and Secondary IDs (2)
    Reported As
    Symbol Synonym
    C(1)A
    (Tang and Presgraves, 2009)
    Name Synonyms
    Compound (1) of Armentrout
    Secondary FlyBase IDs
      References (7)