pksple-1/+ mutant flies are bang sensitive. A high proportion of pksple-1/pksple-1 mutant flies exhibit seizure activity in the "fly flip" assay, and seizure activity is partially suppressed upon feeding with Degrasyn.
pksple-1/+ adults are bang sensitive. In an electroconvulsive stimulation paradigm, pksple-1/+ flies show a lower threshold required to trigger seizure discharges, and more spikes are observed during seizure discharges, as compared to controls. pksple-1/+ larval segmental nerves display enhanced anterograde vesicle transport, as shown by reduced vesicle pause frequencies in the anterograde (but not retrograde) direction, and a decreased percentage of vesicles moving in the retrograde (but not anterograde) direction, as compared with controls. Vesicle velocity is not significantly changed in either direction.
pksple-1/pksple-1 mutants do not exhibit significantly reduced viability, as compared to wild type.
Mutant flies have ectopic joints on the leg. These ectopic joints are located proximal to the normal joint and have inverted polarity.
Rotation of ommatidia is normal in mutant eyes, although chirality is randomised.
pksple-1/pksple-1 or pksple-1/+ flies display severe delays in recovery from seizures (significantly more bang sensitive) compared to control flies. pksple-1/+ flies display an agitated recovery period with excessive grooming and flipping over. Administration of valproic acid to pksple-1/+ flies significantly decreases their bang sensitivity. pksple-1/+ flies show increased seizures regardless of genetic background. A small number of pksple-1/pksple-1 embryos have PNS defects (generalized disorganization, aberrant migration of neuronal processes).
Wing hairs of pksple-1/pksple-27 mutants display normal polarity across the wing.
pksple-1/pksple-27 mutant wings lack coherent ridges in the posterior region of the wing.
Chirality defects in the eye appear to be associated with a mutant R4 precursor.
Mutants show no significant disruption of ovarian morphology.
57.8% of ommatidia in pkpk-sple-13/pksple-1 mutant somatic clones in the eye are normal. 0.6% have rotated ommatidia, 41.6% have chirality defects, none are achiral (0% unscorable).
The orientation of projections of R1-R6 axons onto the lamina is normal for those ommatidia that are correctly orientated, and rotated for those ommatidia that are rotated.
Causes no embryonic phenotype even when homozygous mutant embryos develop from homozygous mutant mothers. Wing phenotype is normal. Affects the eye, abdomen and leg. pksple-1 eyes contain a mixture of ommatidia with reversed polarity and chirality in both hemispheres of the eye. These ommatidia remain aligned along the polar axis, but with their R3 photoreceptors receptors directed toward the equator rather than the pole giving rise to the dorsal-ventral mirror image reversals of the normal rhabdomere pattern. Wings are wild-type. About 1% of ommatidia are reversed in the anterior-posterior axis of the eye. Tarsal duplications affect T2, T3 and T4 segments, with an occasional incipient ectopic joint in the T1. T5 is unaffected. Denticle belt morphology and denticle orientation remains wild-type.
Many ommatidia show polarity reversals. Polarity of ommatidia is close to random in both the dorsal and ventral halves of the eye. Polarity reversals occur at 45%, A/P reversals occur at only 1%. The polarity of each ommatidium is independent of that of its neighbours. There is no abnormality in photoreceptor number per ommatidium, or in the hexagonal array of ommatidia. The D/V boundary is present, as in wild type.
Sections of pksple-1 mutant eyes show a disturbed ommatidial polarity within each ommatidium having the normal arrangement of photoreceptor cells.
RK1. Bristles on legs and abdomen direct abnormally. Sternital bristles point in a more anterior direction that in wild type and tergital bristles are directed toward the midline of the abdomen. Trichomes also are directed abnormally.
Polarity of chaetae and trichomes on legs irregular; relations between bracts and bristles disrupted. High incidence of ectopic tarsal joints with inverted polarity, especially in tarsae 3 and 4; incomplete intersegmental membranes between tarsal segments, especially between segments 3 and 4; no extra sensilla companiformia despite extra joints. Chaetae on abdominal tergites turned toward midline instead of pointing posteriorly as in wild type; polarity of bristles on sternites disrupted as well.