Polytene chromosomes normal.
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.
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.
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.
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.
Ubx6.28 has visible | dominant phenotype, enhanceable by Df(2L)tkv2/+
Ubx6.28 has capitellum phenotype, enhanceable by Df(2L)tkv2/+
Ubx6.28/Ubxbx-8 has adult mesothoracic segment | anterior | ectopic phenotype, enhanceable by Df(3L)3643
Ubx6.28/Ubxbx-8 has adult metathoracic segment phenotype, enhanceable by Df(3L)3643
Ubx6.28/Ubxbx-34e has adult metathoracic segment phenotype, enhanceable by E(bx)ry122
Ubx6.28/Ubxbx-34e has haltere phenotype, enhanceable by E(bx)ry122
Ubx6.28/Ubxbx-34e has wing | ectopic phenotype, enhanceable by E(bx)ry122
Ubx6.28/Ubxbx-34e has adult mesothoracic segment | anterior | ectopic phenotype, enhanceable by E(bx)ry122
Ubx6.28/Ubxbx-8 has haltere phenotype, enhanceable by Df(3L)3643
Ubx6.28/Ubxbx-8 has wing | ectopic phenotype, enhanceable by Df(3L)3643
Ubx6.28/Ubxbx-8 has adult mesothoracic segment | anterior | ectopic phenotype, enhanceable by E(bx)Nurf301-2
Ubx6.28/Ubxbx-8 has adult metathoracic segment phenotype, enhanceable by E(bx)Nurf301-2
Ubx6.28/Ubxbx-34e has adult mesothoracic segment | anterior | ectopic phenotype, enhanceable by E(bx)Nurf301-2
Ubx6.28/Ubxbx-34e has adult metathoracic segment phenotype, enhanceable by E(bx)Nurf301-2
Ubx6.28/Ubxbx-34e has haltere phenotype, enhanceable by E(bx)Nurf301-2
Ubx6.28/Ubxbx-34e has wing | ectopic phenotype, enhanceable by E(bx)Nurf301-2
Ubxpbx-1/Ubx6.28 has haltere disc posterior compartment phenotype, suppressible | partially by Scer\GAL4en-e16E/tkvUAS.cLa
Ubxbx-3/Ubx6.28 has haltere disc anterior compartment phenotype, suppressible | partially by Scer\GAL4ptc-559.1/tkvUAS.cLa
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.