Flies expressing ninaCΔ174 in a ninaC5 background show similar rates of termination of the photoresponse (measured using an electroretinogram recording) as wild-type flies after pre-exposure to light.
Like ninaC5, but unlike ninaCΔ132, photoreceptors treated with 8-Br-cAMP or IBMX show no alteration in the kinetics of the macroscopic light response.
Voltage clamped flash response shows delayed response termination. Plateau responses are also large in response to steady light. Also exhibits quantam bump-like activity in the dark and larger and longer bumps in the light. Turn-off to the pupil mechanisms is defective and the pupillary pigment migration is smaller than that in wild type.
The electroretinogram of young ninaC5 flies carrying ninaCΔ174 reared in the dark is similar to that of ninaC5 mutant flies. ninaC5 flies carrying ninaCΔ174 show the same time course of retinal degeneration as ninaC5 flies.