25% of mutant pharate adults have a bent leg phenotype.
Mutant embryos show ISNb axon pathfinding defects.
Motorneuron pathfinding is disrupted in these embryos as although the ISNb and SNa axons exit the ventral nerve cord correctly and extend into their target field, they fail to advance far enough to innervate the appropriate muscle. The ISNb axons commonly stall at muscle 6 and fail to form synapses on muscles 12 and 13, or reach muscle 12 but are unable to form a synapse. The SNa usually extends into the target muscle but frequently exhibits the loss of one or both branches.
dawΔ1/daw3 is rescued by dawUAS.cPa/Scer\GAL4repo
dawΔ1/daw3 is rescued by dawUAS.cPa/Scer\GAL4Mef2.PR
dawΔ1/daw3 is rescued by dawUAS.cPa/Scer\GAL4RapGAP1-OK6
Two copies of dawScer\UAS.cPa, under the control of Scer\GAL4repo or Scer\GAL4Mef2.PR, rescues the axon guidance defects of daw3/dawδ1 embryos, while one copy provides partial rescue. Expression driven by Scer\GAL4OK6 also reverses the defects.