Embryos expressing kirreUAS.cRa under the control of Scer\GAL4GMR88F09 show lateral transverse muscle defects: muscle splitting and increased number of nuclei.
Wild-type garland cell nephrocytes (GCNs) fuse to form binucleate GCNs in third instar larvae. In contrast, overexpression of kirreScer\UAS.cRa driven by Scer\GAL4pros.PMG results in excessive GCN fusion resulting in multinucleate GCN cells in third instar larvae.
Overexpression of kirreScer\UAS.cRa using Scer\GAL4hs.2sev results in a rough eye phenotype.
Overexpression of kirreScer\UAS.cRa using Scer\GAL4MZ1369 results in optic lobe abnormalities with variable penetrance.
Overexpression of kirreScer\UAS.cRa using Scer\GAL4kirre.PR leads to an increased number of nuclei in all muscles analysed (VA2 and SBM).
There is no change in the numbero of SBM nuclei upon expression of kirreScer\UAS.cRa using Scer\GAL4slou.S59.
When kirreScer\UAS.cRa is expressed under the control of Scer\GAL4Dll-md23 in a Df(1)w67k30 background, the migration of myoblasts is redirected toward sites of ectopic kirre expression. In these embryos, there is a substantial aggregation of myoblasts in the head and on the primordia of the leg discs. When kirreScer\UAS.cRa is expressed under the control of Scer\GAL4wg.PM in a Df(1)w67k30 background, myoblasts migrate towards the site of ectopic kirre expression; unfused myoblasts distribute themselves on the inner face of the epidermis in a segmentally repated pattern of bands at stage 12 and myoblasts are also attracted toward a restricted region of the visceral mesoderm surrounding the midgut (parasegment 8), where wg is normally expressed.
Scer\GAL4how-24B/kirreUAS.cRa partially rescues Df(1)w67k30
Scer\GAL4ap-md544/kirreUAS.cRa partially rescues Df(1)w67k30
Scer\GAL4twi.PB/kirreUAS.cRa partially rescues Df(1)w67k30
kirreUAS.cRa/Scer\GAL4sns.PK fails to rescue Df(1)w67k30
The garland cell phenotype associated with kirresps-1 mutants is rescued by the expression of kirreScer\UAS.cRa using Scer\GAL4sns.GCN.
Expression of kirreScer\UAS.cRa under the control of Scer\GAL4sns.PK does not rescue myoblast fusion in Df(1)w67k30 embryos.
Expression of kirreScer\UAS.cRa under the control of Scer\GAL4how-24B restores the ability of myoblast founders to attract fusion-competent myoblasts in Df(1)w67k30 mutant embryos. Myoblast fusion occurs to a significant extent and a wild type muscle pattern in every segment is observed.
Expression of kirreScer\UAS.cRa under the control of Scer\GAL4twi.PB restores fusion in every muscle of Df(1)w67k30 embryos. The muscle pattern is almost wild type in the rescued embryos, though with some smaller muscles and scattered unfused myoblasts. There is an accumulation of unfused myoblasts around the hindgut and at other locations where twi is normally expressed at high levels (these phenotypes may be a consequence of using Scer\GAL4twi.PB as the driver). Expression of kirreScer\UAS.cRa under the control of Scer\GAL4ap-md544 restores fusion exclusively in LT and VA muscles.