Nucleotide substitution: G to A. Amino acid replacement: G1105R. Mutation replaces an invariant Gly residue flanking the active site of the first phosphatase domain.
G12739550A
G?A
G1105R | Ptp69D-PA; G1104R | Ptp69D-PB
G1105R
photoreceptor cell & axon | somatic clone
photoreceptor cell R1 & axon | somatic clone
photoreceptor cell R2 & axon | somatic clone
photoreceptor cell R3 & axon | somatic clone
photoreceptor cell R4 & axon | somatic clone
photoreceptor cell R5 & axon | somatic clone
photoreceptor cell R6 & axon | somatic clone
photoreceptor cell R7 & axon | somatic clone
Photoreceptor fates are correctly specified, but their axons project abnormally into the optic lobes in homozygous clones in the eye. Some of the axons of R1-R6, which normally terminate in the lamina, instead continue through the lamina to terminate in the medulla, terminating at the same level as either the R8 or R7 axons. Frequent gaps in the array of R7 axon termini in the medulla are seen. 47% of R7 axons fail to reach their normal target layer in the medulla (although the R7 cell is missing in only 1% of ommatidia). Approximately 70% of R7 axons terminate prematurely within the medulla at the same level as the R8 axons.