slik04807b homozygosity leads to ectopic localization of inner proliferating center (IPC) neuroblasts in the medulla of third instar larvae; defects in optic lobe organization with an absence of the organization of photoreceptor cell axons in pupae; and elongated optic lobes with architecture defects (such as absence of organization of the medulla and elongated lobula plate but no changes in the organization of lobula or lamina), ectopic projections in the medulla (likely to be originated from lamina neurons), ectopic localization of IPC-derived cell populations (such as lobula plate T4/T5 neurons) misplaced in the proximal medulla and incorrect connection of the lamina to the medulla through its proximal region (next to the lobula plate) instead of connecting through the distal medulla in adults when compared to controls.
slik04807b homozygous adults exhibit defects in response to the light compared to controls.
slik04807b heterozygous adults do not exhibit any optic lobe neuropil defects when compared to controls.
The adult brain of sli2/slik04807b transheterozygotes exhibits major defects in neuropil organization in several central brain areas including the central complex, mushroom body lobes, antennal lobes and Robo2/Robo3-expressing axons, as compared to either heterozygous controls; their adult sLNv neurons exhibit significantly longer axon projections compared to controls.
The adult brain of slik04807b homozygotes exhibits defects in the organization of the ellipsoid body and the mushroom body, and their adult sLNv neurons exhibit significantly longer axon projections, as compared to controls.
Photoreceptor cell axons do not form an optic chiasm in slik04807b mutants.
There are gaps in the lamina neuropil in the visual system of homozygous third instar larvae and increased numbers of photoreceptor axons enter the medulla; many R2-R5 axons pass through the lamina and enter the medulla, in contrast to wild type where they stop in the lamina neuropil. slik04807b/sli05248, slik04807b/sliE-158 and slik04807b/sli2 third instar larvae show defects in photoreceptor axon targeting, with gaps in the lamina and increased numbers of axons entering the medulla. slik04807b/sli2 animals show disruption of the lamina glia layer; clumps of glia and gaps in the glial layers are seen. The regions of photoreceptor axon mistargeting correlate with areas of lamin glial disruption. Many distal cell neurons enter the base of the lamina in slik04807b/sli2 third instar larvae and some distal cell neurons invade the lamina neuropil, disrupting photoreceptor innervation.
Mutant strongly disrupts the target layer selections of R1-R6 photoreceptor axons.