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General Information
D. melanogaster
FlyBase ID
Feature type
Computed Breakpoints include
Sequence coordinates
2R:21,089,480..21,119,799 (Df(2R)AA21:bk1)
2R:21,394,608..21,499,204 (Df(2R)AA21:bk2)
Member of large scale dataset(s)
Nature of Aberration
Cytological Order

2Lt - 56D | 58E - 57D12 | 56F - 56E | 58F - 2Rt

Class of aberration (relative to wild type)
Class of aberration (relative to progenitor)


Causes alleles
Carries alleles
Transposon Insertions
Formalized genetic data

mei-W68 << bk1 << l(2)57Bd << l(2)57Dc << bk2 << Egfr << bk3 << l(2)57Ec

Genetic mapping information

This deletion removes multiple ribosomal protein-coding genes (in addition to other genes).

Comments on Cytology

The left Df(2R)AA21 breakpoint lies within CG4030 or CG9394 or in the region between them, and lies in the range 2R:16976985..17007304 (R5) (predicted cytology: 57B19-57C1).

The right Df(2R)AA21 breakpoint lies within Sdc or CG10496 or in the region between them, and lies in the range 2R:17282113..17386709 (R5) (predicted cytology: 57E1-57E6).


Ref: Lindsley and Zimm, 1992

Ref: Mackay et al., 1985, Genetics 111: 885--904.

Limits of break 1 from polytene analysis (FBrf0076124) Left limit of break 2 from polytene analysis (FBrf0080145) Right limit of break 2 from polytene analysis (FBrf0076124) Right limit of break 3 from complementation mapping against l(2)57Ec (citation unavailable)

Sequence Crossreferences
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
Phenotypic Data
In combination with other aberrations
NOT in combination with other aberrations

Flies heterozygous for the deletion do not show a Minute bristle phenotype.

Heterozygosity for Df(2R)AA21 results in 1.1% X chromosome nondisjunction and 1.1% fourth chromosome nondisjunction in In(1)FM7/X ; svspa-pol females.

Does not cause unconditional lethality in hybrid females when heterozygous with D.simulans chromosome.

No second site non-complementing phenotype with zipEbr and zipmhc-c6.1.

Shows no maternal enhancement of dpphr4.

Does not uncover Dsim\jba in D.melanogaster/D.simulans hybrids. Uncovers Dsim\pm in D.melanogaster/D.simulans hybrids.

Midgut development of mutant embryos is wild type.

Does not suppress variegation of bwD.

Stocks (2)
Notes on Origin

The Df(2R)AA21 chromosome also carries the Obp57eAA21 mutation.

Balancer / Genotype Variants of the Aberration
Separable Components
Other Comments

The Df(2R)AA21 chromosome may act as a dominant 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 the eye colour phenotype in the presence of Df(2R)AA21 overlaps the eye colour phenotype in a wild-type background so it cannot be unequivocally demonstrated that the deficiency chromosome uncovers a suppressor of telomeric silencing. In addition, any suppression 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 a combination of nonsuppressing deficiencies and deficiencies with suppressors that map to the 2L tip.

"57B4-57D12;<up></up>" was stated as revision.

Synonyms and Secondary IDs (9)
References (55)