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General Information
D. melanogaster
Deficiency (3R) Ultrabithorax
FlyBase ID
Feature type
Also Known As
Df(3R)Ubx109, Df(3R)109, Df109, Ubx109, Df(3R)P109, Df(Ubx)109, DfUbx109
Computed Breakpoints include
Sequence coordinates
3R:16,576,189..16,639,771 (Df(3R)Ubx109:bk1)
3R:16,831,116..16,923,231 (Df(3R)Ubx109:bk2)
Member of large scale dataset(s)
Nature of Aberration
Cytological Order
Class of aberration (relative to wild type)




Causes alleles
Carries alleles
Transposon Insertions
Formalized genetic data

l(3)89Da << bk1 << l(3)89Df << bk2 hits abd-A

Genetic mapping information

The 3R:16576189..16639771 release 6 coordinates of the left breakpoint are estimates. The left extent corresponds to the estimated position of the left end of polytene band 89D2, because published cytologies indicate the Df(3R)Ubx109 breakpoint lies right of 89D1. The right extent corresponds to the right end of Fas1, which published results say is deleted.

The 3R:16831116..16923231 release 6 coordinates of the right breakpoint are estimates corresponding to the left and right ends of iab-8. FBrf0042053 mapped the right breakpoint of Df(3R)Ubx109 within iab-8.

Breakpoint(s) molecularly mapped

Right breakpoint 86 to 93 kb distal to the right breakpoint of In(3R)Cbxrv1 (Karch et al., 1985)

Comments on Cytology

Left limit of break 1 from non-inclusion of l(3)89Da (FBrf0043252) Right limit of break 1 from inclusion of Fas1 (FBrf0047653) Left limit of break 2 from inclusion of abd-A (FBrf0043252) Right limit of break 2 from polytene analysis (FBrf0034411)

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

The early stages of cardiac tube morphogenesis occur normally in Df(3R)Ubx109/Dp(3;3)P5 embryos, but later differentiation of the cardiomyocytes is impaired; the cardiac tube shows no heterogeneity along the anterior-posterior axis (in contrast to wild type) and the aorta and heart do not differentiate normally. The cells are not conspicuously polarised along the whole length of the cardiac tube and appear most similar to the cells that are normally found in the anterior-most segments (T3 and A1). Other cells, which may be lymph gland cells, are found in ectopic locations along the cardiac tube.

Does not show a dose-sensitive interaction with Df(3R)by10, Df(3R)by416 or Df(3L)AC1.

Germ line clonal analysis shows that the combination Df(3R)P9/Df(3R)Ubx109 lacks germ line functions necessary for normal egg production. The combination Dp(3;3)bxd100 Df(3R)Ubx109/Df(3R)P9 is viable in germ line clones.

Viable in heterozygous combination with In(3LR)P88. Viable in heterozygous combination with Tp(3;3)sbd104. Viable in heterozygous combination with Df(3R)sbd104. Viable in heterozygous combination with Tp(3;1)P115. Viable in heterozygous combination with Df(3R)P115 Dp(3;3)S462. Lethal in heterozygous combination with Tp(3;3)bxd100. Lethal in heterozygous combination with Df(3R)bxd100. Lethal in heterozygous combination with Df(3R)P115. Lethal in heterozygous combination with Tp(3;2)iab2P10. Lethal in heterozygous combination with Df(3R)P10. Lethal in heterozygous combination with Df(3R)P10 Dp(3;3)sbd104.

NOT in combination with other aberrations

Df(3R)Ubx109 mutant embryos show a significant increase in the proportion of mitotic neuroblasts only in A9-10 ventral nerve cord segments, and a significant increase in the proportion of mitotic neuroblast daughter cells in A1, A7, A8 and A9-10 ventral nerve cord segments, as compared to controls.

Df(3R)Ubx109/Df(3R)Ubx109 mutant embryos exhibit transformation of abdominal segments A2-A8 into T3 identity, and show severe defects in Malpighian tubule migration and organization, with tubules failing to migrate anteriorly beyond the A3 or A4 segment and often being thicker than normal, but tubules do maintain their ability to form loops, as compared to wild type.

Ubx6.28 Df(3R)Ubx109 heterozygous larvae exhibit mild transformations of the A1 denticle belts towards an intermediate T3/A1 identity. UbxΔQA/Ubx6.28 Df(3R)Ubx109 larvae form ectopic A1 Keilin's Organs with up to three bristles. UbxΔQA/Ubx6.28 Df(3R)Ubx109 embryos generate small but robust ectopic limb primordia of up to half the size of thoracic limb primordia. Df(3R)Ubx109 homozygous larvae form full three-bristle ectopic Keilin's Organs on A1-A7 larval segments. These mutants also exhibit ectopic limb primordia in the A1 embryonic segment. Df(3R)Ubx109 homozygous larvae exhibit mild transformations of the A1 denticle belts towards an intermediate T3/A1 identity.

In stage 16 Df(3R)Ubx109 homozygous embryos there is a significant reduction in the total number of cells in the embryonic dorsal vessel from 104 to around 80.

In mutant embryos, the heart and the posterior aorta are transformed into anterior aorta, with the exception of segment A1.

BrdU incorporation appears normal in the suboesophageal ganglion and in the thorax of homozygous stage 16/17 embryos. However, in the abdominal neuromeres (except for the terminal region) lateral cells incorporate BrdU in patterns reminiscent of the thoracic region. Heterozygous larvae have additional large clusters of BrdU labelled cells in segments A3, A4 and sometimes A5.

Heterozygotes show a partial transformation of haltere to wing, characterised by the appearance of bristles and an apparent anterior wing margin. This phenotype is enhanced if the flies are also homozygous for RasGAP1sxt-BJ61. The enhancement of the Df(3R)Ubx109/+ phenotype by RasGAP1sxt-BJ61 is partially reversed if the flies also carry Ras85De1B.

Does not support transvection effects.

Homozygotes fail to form gonads.

Ectopic Scr expression causes T1 beard formation in thoracic segments 1 to 3 and abdominal segments 1 to 7 and ectopic salivary glands formation in parasegments 0 and 1.

In embryos, denticle belts of T3-A7 resemble those of T2. Anterior spiracles form in each segment from T1 to A6. All dorsal Poxn expressing cells in the abdomen migrate ventrally and differentiate as kolbchen.

Embryos have no A- and B- cells in A1-7, where instead thorax-speciifc A/B-like glial cells could be detected, which do not derive from NB1-1.

Transformation of parasegment 5 to 12 into copies of parasegment 4. Heat induction of UbxIb.hs in these homozygotes causes transformation of parasegments 1 to 12 into copies of parasegment 6.

When in combination with salm mutations embryos exhibit the Df(3R)Ubx109 phenotype in parasegments 5 to 13 and the salm mutant phenotype in the tail region.

In homozygotes all abdominal segments except the last segment are transformed into thorax.

Heterozygotes have halteres that are 2-3 times their normal size, never have hypopleural bristles or metanotal tissue and a weak transformation of anterior third leg to anterior second leg.

Deficiency of Ubx, lethal when heterozygous with Df(3R)P9.

Homozygous lethal.

Homozygous embryos have 10 segments with mesothoracic characteristics, followed by a small eighth abdominal segment. The ventral cord of central nervous system is longer and thicker than wild-type, and has 10 clearly defined intracortical cell bands, one at the anterior margin of the first 10 neuromeres.

Stocks (3)
Notes on Origin

Lewis, 1956.


Balancer / Genotype Variants of the Aberration
Separable Components
Other Comments
Synonyms and Secondary IDs (17)
Reported As
Symbol Synonym
Name Synonyms
Deficiency (3R) Ultrabithorax
Secondary FlyBase IDs
  • FBab0002467
  • FBal0017397
References (96)