Expression of Trim9Scer\UAS.T:Ivir\HA1 specifically in v'ada cells (using the MARCM system under the control of Scer\GAL4ppk.PG) causes ectopic formation of contralateral projections; 26.9% of cells show more than one ectopic commissural branch. Doubling the copy number of the Trim9Scer\UAS.T:Ivir\HA1 transgene results in an even higher number of commissural branches (43.5%). No defects in dendrite morphogenesis are observed.
Scer\GAL4ppk.PG, Trim9UAS.Tag:HA has abnormal neuroanatomy | somatic clone | third instar larval stage phenotype, suppressible by fra3/fra4
Scer\GAL4ppk.PG, Trim9UAS.Tag:HA has abdominal anterior ventral multidendritic neuron vdaa phenotype, suppressible by fra3/fra4
A fra4 mutant background suppresses the ectopic contralateral projections seen when Trim9Scer\UAS.T:Ivir\HA1 is expressed in v'ada neurons under the control of Scer\GAL4ppk.PG.