Southern blotting shows a breakpoint in the +14.6 - +16.3 interval, DNA right of +16.3 is still present demonstrating that the 3' breakpoint is not one end of a deficiency. The relationship of the wgl-16 lesion to the cytology of the Df(2L)wg-CX3 chromosome is not clear; they might be related parts of a complex rearrangement, or might be independent events in the same chromosomal region. The wgl-16 mutation is associated with an insertion of unknown DNA just 3' to the transcription unit (FBrf0046100; FBrf0066940).
Insertion of DNA in the 3' control region.
17kb insertion into the 3' regulatory region.
Deletion that brings other sequences close to the transcription terminus, thereby reducing the production of mRNA and protein.
Approximately 17kb insertion at the 3' end of the wg transcript.
Deletion of sequences between position +10.8 and +15.6 on the wg map.
break between +10.8 and 15.0 kb
Mutants show ectopic retinogenesis along the dorsal margin of the eye disc.
wg17en40cP1/wgl-16 flies show the loss of nearly all pseudotracheae, which are structurally characteristic of the distiproboscis. These flies show no significant loss of taste bristles nor any significant change in mediproboscis morphology.
Dominantly enhances the appearance of an apoptotic cluster of cells in the primordial wing tip of the late third larval instar biomb-1/Y wing disc.
wgl-16/wgl-17 mutant clones cause a phenotype in the external male genitalia; a reduction in number of clasper teeth, two lateral plates are fused to one with reduced number of bristles and there is rudimentary penis apparatus. Internal male and female genitalia are completely deleted. External female genitalia is generally normal.
25% of wgl-16/wgP flies have wings on the prothoracic segment, and the mesothoracic wings and metathoracic halteres are always absent. 10% of wgl-16/wgP flies show a varying degree of transformation of the metathoracic legs to halteres, ranging from graded removal of the distal segments (tibia and tarsus), through distortion of the femur and graded removal of leg bristles, to transformation of the coxa and trochanter into the first and second segments of the haltere.
wgl-16/wgSp-1 individuals are lethal. Adult escapers lack one or both anterior dorsocentral bristles and more rarely also the posterior postalar bristle and the presutural bristle. They also exhibit loss of distal antennal segments and in rare cases exhibit antennal duplication. Individuals in combination with wgSp-revP, wgP and wgl-17 are pupal lethal. Individuals are adult viable and exhibit the wing phenotype when in combination with wg1. When in combination with wgspd-j2 individuals are lethal, escapers lack antennae and the first pair of legs.
The heteroallelic combination wgl-12/wgl-16 has been used as a temperature sensitive genotype to study the requirement for wg gene product in the development of the leg, wing and haltere imaginal discs: wg is required only during the second larval instar in the wing and haltere discs, whereas legs are affected by temperature shifts at all times up until 96 hours after egg laying (at 25oC).
Adult homeotic transformation of wing to notum.
pupal lethal
wgl-16/wgl-17 has visible phenotype, suppressible | partially by Scer\GAL4ptc-559.1/Wnt4UAS.cGa
wg[+]/wgl-16 is a suppressor of lethal | somatic clone | pupal stage phenotype of Stat92E85C9
wgl-16/wgl-17 has antenna phenotype, suppressible | partially by Scer\GAL4ptc-559.1/Wnt4UAS.cGa
wgl-16/wgl-17 has wing disc phenotype, suppressible by Scer\GAL4ptc-559.1/Wnt4UAS.cGa
wgl-16/wgl-17 has haltere phenotype, suppressible by Scer\GAL4ptc-559.1/Wnt4UAS.cGa
wgl-16/wgl-17 has leg phenotype, suppressible by Scer\GAL4ptc-559.1/Wnt4UAS.cGa
wgl-16/wgl-17 has mesonotum | ectopic phenotype, suppressible by Scer\GAL4ptc-559.1/Wnt4UAS.cGa
wgl-16/wgl-17 has wing phenotype, suppressible by Scer\GAL4ptc-559.1/Wnt4UAS.cGa
wgl-16/wgl-17 has wing phenotype, suppressible by Scer\GAL4dpp.blk1/vgUAS.cKa
wg[+]/wgl-16 is a suppressor of eye | somatic clone phenotype of Stat92E85C9
wg[+]/wgl-16 is a suppressor of cuticle & adult external head | somatic clone phenotype of Stat92E85C9
wg[+]/wgl-16 is a suppressor of head | somatic clone phenotype of Stat92E85C9
wgl-16 is a suppressor of arista | increased number phenotype of obk1
l(2)gd11, wgl-16 has metathoracic leg disc phenotype
Flies carrying Stat92E85C9 Minute clones in a wgl-16/+ background show a significantly increased rate of eclosion compared to those with a wild-type background. Further, eclosed wgl-16/+; Stat92E85C9 Minute flies show less severe phenotypes compared to eclosed Stat92E85C9 Minute flies.
Many of the phenotypes caused by wgl-16/wgl-17 can be rescued by expression of Wnt4Scer\UAS.cGa under the control of Scer\GAL4ptc-559.1; wing rescue is seen at high frequency, halteres appear well developed, leg morphology is often rescued, but partial rescue of the antenna is only occasionally seen.
Scer\GAL4dpp.blk1-mediated expression of vgScer\UAS.cKa restores the wing.
wgSp-1/wgl-16 is partially rescued by wgUAS.cLa/Scer\GAL4cad-em459
Expression of wgScer\UAS.cLa under the control of Scer\GAL4cad-em459 in wgl-16/wgSp-1 females sometimes results in recovery of the vaginal plates and tergite eight, but not the vulva. The analia are much reduced in some cases and some females have no genital and anal structures. Expression of wgScer\UAS.cLa under the control of Scer\GAL4cad-em459 in wgl-16/wgSp-1 males results in recovery of genital structures such as the claspers and penis apparatus, although the penis apparatus is sometimes still reduced. Analia are almost normal or reduced.
Baker.
There is enough wg activity in homozygotes to produce imaginal discs but not enough for normal disc development.