The 50% lethal phase of Khc6/Khc27 animals on normal and rich food is the third larval instar stage. On poor food, the 50% lethal phase is shifted to the pupal stage.
Khc6/Khc27 larvae show reduced flux of both neurosecretory dense core vesicles and mitochondria along the axons compared to wild type.
In Khc6/Khc27 larval motor axons, the anterograde and retrograde flux of mitochondria is reduced by 70-90%.
Khc6/Df(2R)Jp6 larvae exhibit early loss of motor activity in the ventral posterior segments causing an inbalance in bodywall contractions such that larvae rhythmically flip their tails upward during locomotion. Mutation causes organelle-filled axonal swellings that exhibit abnormal accumulation of nerve terminal proteins, syt, Csp, Syx1A and Fas3. Slow axonal transport does not make a substantial contribution to the swellings. Mutation causes dystrophic neuromuscular junctions; the number of synaptic boutons per muscle 6/7 junction in segments A2 and A6 in wandering third instar larvae is reduced threefold and fivefold respectively.
Khc6/KhcBD heteroallelic flies cultured at 22oC become paralysed at 39oC. The temperature threshold for this behavior is higher than that for mlenap-ts1 or parats1, and the timecourse of recovery is slower. For many minutes the flies remain sluggish. Shows no bang sensitivity.
Impairs action potential propagation in axons and neurotransmitter release at nerve terminals, but has no effect on the concentration of synaptic vesicles in nerve terminal cytoplasm, nor the number of axons in a nerve bundle. Post-synaptic response to spontaneous vesicle release is normal. The phenotype is more severe for the A6 segment than the A2 segment demonstrating a correlation between severity of phenotype and axon length.
Larval growth abnormalities and lack of mobility.