FB2024_03 , released June 25, 2024
Allele: Dmel\Ubx6.28
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General Information
Symbol
Dmel\Ubx6.28
Species
D. melanogaster
Name
FlyBase ID
FBal0017486
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
Ubx6-28
Key Links
Genomic Maps

Mutagen
Nature of the Allele
Progenitor genotype
Cytology

Polytene chromosomes normal.

Description

Deletion of 32bp at the 5' end of exon 1 that causes a frame shift at codon 27 and a premature stop to translation.

32bp deletion in the major 5' exon, introducing a frame shift into the open reading frame (ORF) after 27 codons, and resulting in the premature termination of the ORF after a further 37 incorrect codons.

Deletion of 50bp at map position -31.5kb. very close to the site of the Doc element insertion in Ubx1.

Mutations Mapped to the Genome
Curation Data
Type
Location
Additional Notes
References
Variant Molecular Consequences
Associated Sequence Data
DNA sequence
Protein sequence
 
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

abdominal segment 1 & haltere | ectopic

abdominal segment 1 & Keilin's organ | ectopic

abdominal segment 1 & metathoracic leg | ectopic

mesothoracic laterotergite & macrochaeta | ectopic (with UbxΔQA)

trichome & mesothoracic leg (with UbxΔQA)

trichome & metathoracic leg (with UbxΔQA)

Detailed Description
Statement
Reference

Homozygous clones in the haltere discs of late third instar larvae are of similar size to their twin spots.

The capitellum of the haltere is enlarged compared to wild type in Ubx6.28 heterozygotes.

The posterior compartment is increased in size in Ubx6.28/Ubxpbx-1 haltere discs.

The anterior compartment is increased in size in Ubx6.28/Ubxbx-3 haltere discs.

Homozygous clones in the haltere show transformation of haltere tissue to wing and the haltere is larger than that seen in wild-type flies.

In Ubxbx-3 Ubxpbx-1 Ubx6.28 L3 larvae, tracheal metamere 3 is transformed into tracheal metamere 2. Tracheal metamere 2 appears normal.

Ubx6.28 heterozygotes exhibit halteres that are about twice the volume of wild-type and often have multiple ectopic bristles (2.59 bristles per haltere). Ubx6.28 larvae form only partial two-bristle ectopic Keilin's Organs on the A1 segment, with only incomplete ectopic limb primordia formed in the A1 segment. UbxΔQA/Ubx6.28 larvae form ectopic A1 Keilin's Organs with up to two bristles. Ubx6.28 heterozygotes only very rarely develop limited postnotal tissue, due to transformation of T3 towards a T2 identity. Ubx6.28 heterozygous larvae exhibit mild transformations of the A1 denticle belts towards an intermediate T3/A1 identity. Ubx6.28 homozygotes exhibit complete transformations of the A1 denticle belts to T2 identity. UbxΔQA/Ubx6.28 mutant T3 laterotergites transform towards a T2 thorax identity, as expressed by the number of ectopic bristles present. UbxΔQA mutants adults have moderate transformations of the T3 laterotergite towards T2 identity, with up to three ectopic bristles per half-laterotergite. UbxΔQA/Ubx6.28 mutants exhibit extensive postnotal tissue, with up to a dozen ectopic bristles per half-laterotergite. UbxΔQA/Ubx6.28 adults exhibit severely reduced A1 tergites, which in extreme cases are nearly absent. In many UbxΔQA/Ubx6.28 adults, the combination of an extremely reduced A1 tergite and a partial transformation of the T3 laterotergite toward an intermediate T2/T3 postnotal identity create an indistinct boundary between the dorsal thorax and abdomen. In UbxΔQA/Ubx6.28 mutants, the area of naked cuticle which in wild-type is without non-sensory microtrichiae (trichomes) in the posterior of the T2 legs (T2p) is reduced, and in some cases, nearly eliminated, whereas the phenotype of Ubx6.28 heterozygotes is closer to wild-type. In UbxΔQA/Ubx6.28 mutants, the area of naked cuticle which in wild-type is without non-sensory microtrichiae (trichomes) in the posterior of the T3 legs (T3p), exhibits expansive regions of trichomes formed distally and ventrally, while Ubx6.28 heterozygous T3p exhibit only a few distal trichomes compared with the wild-type.

Ubx6.28/Ubxbx-34e and Ubx6.28/Ubxbx-8 mutant combinations cause a homeotic transformation of the third thoracic segment to the anterior second thoracic segment. The haltere (T3) is also transformed toward wing fate (t2), manifested by increases in size and the development of bristles.

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

Expression of βTub60D in visceral mesoderm reduced, particularly in A1 and A2.

Anterior constriction of the midgut has formed and is slightly more posterior as compared to wild type.

Ubx6.28 embryos have no dpp protein in the mesoderm of parasegments 6 or 7, a faint band can be seen at the posterior part of the domain directly adjacent to wg and abd-A expression.

Homozygotes complete embryogenesis and occasionally survive as third instar larvae. They have the characteristic Ubx phenotype of transformed denticle belts and three pairs of anterior spiracles.

The frequency of variegated bithorax transformations seen in Df(3R)red-P52 heterozygotes is not increased in flies also heterozygous for Ubx6.28.

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
Enhanced by
Statement
Reference

Ubx6.28 has visible | dominant phenotype, enhanceable by Df(2L)tkv2/+

Phenotype Manifest In
Enhanced by
Statement
Reference

Ubx6.28 has capitellum phenotype, enhanceable by Df(2L)tkv2/+

Suppressed by
Other
Statement
Reference

Scrhs.PZ, Ubx6.28 has T1 beard & abdominal segment 1 phenotype

Additional Comments
Genetic Interactions
Statement
Reference

The enlarged capitellum phenotype seen in Ubx6.28 heterozygotes is enhanced by Df(2L)tkv2/+.

The increased size of the posterior compartment that is seen in the haltere discs of Ubx6.28/Ubxpbx-1 animals is partially suppressed by expression of tkvScer\UAS.cLa under the control of Scer\GAL4en-e16E.

The increased size of the anterior compartment that is seen in the haltere discs of Ubx6.28/Ubxbx-3 animals is partially suppressed by expression of tkvScer\UAS.cLa under the control of Scer\GAL4ptc-559.1.

The addition of E(bx)Nurf301-2, E(bx)ry122 or Df(3L)3643 to Ubxbx-34e/Ubx6.28 animals enhances the anterior transformation seen in both the third thoracic segment and the haltere. The addition of E(bx)Nurf301-2 or Df(3L)3643 to Ubxbx-8/Ubx6.28 animals enhances the anterior transformation seen in both the third thoracic segment and the haltere.

Scrhs.PZ expression in Ubx6.28 heterozygotes or homozygotes causes T1 beard formation in abdominal segment 1.

Xenogenetic Interactions
Statement
Reference
Complementation and Rescue Data
Comments
Images (0)
Mutant
Wild-type
Stocks (0)
Notes on Origin
Discoverer
External Crossreferences and Linkouts ( 2 )
Crossreferences
GenBank Nucleotide - A collection of sequences from several sources, including GenBank, RefSeq, TPA, and PDB.
GenBank Protein - A collection of sequences from several sources, including translations from annotated coding regions in GenBank, RefSeq and TPA, as well as records from SwissProt, PIR, PRF, and PDB.
Synonyms and Secondary IDs (2)
Reported As
Name Synonyms
Secondary FlyBase IDs
    References (22)