Nucleotides +359 to +361 in the coding region are substituted by the two nucleotides AG, resulting in a frameshift.
AG
The three nucleotides CCA at postion 259-361 in the CDS are replaced by the sequence AG resulting in a frame shift at amino acid 120.
Compared with wild-type, ort5 mutants show moderate reduction in the 1F1 component of frequency-tagged steady-state visually evoked potentials. 2F1 responses are almost completely eliminated in the mutant flies. The 2F1 response in ort5 mutants is only evident at high contrast, where it is approximately 20% of the wild-type, though significantly above the system noise. The fourth-order intermodulation term 2F1+2F2 is entirely abolished in the mutant, with the level of signal similar to the system noise.
The depolarizing "on" and "off" transients that are normally seen in the electroretinograms of wild type flies are absent in ort5 mutant flies, even at saturating light intensities.
Mutant larvae and adults show increased susceptibility to abamectin or ivermectin compared to wild type (viability is reduced). They do not show any increased sensitivity to ethanol compared to wild type. ort5/Df(3R)12 adults and ortP364/ort5 show increased susceptibility to abamectin compared to wild type (viability is reduced). Mutant adults do not show increased sensitivity to dieldrin compared to wild type.
Rhabdomeres of young flies are reduced in size and show aberrant packing of microvilli. Rhabdomeres are nearly wild type in adults.
Hardy, Orevi and Merriam.