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• W2891739829 abstract "The compound eye of Periplaneta americana contains two spectral classes of photoreceptors: narrow-band UV-sensitive and broad-band green-sensitive. In intracellular recordings, stimulation of green-sensitive photoreceptors with flashes of relatively bright UV/violet light produced anomalous delayed depolarization after the end of the normal light response, whereas stimulation of UV-sensitive photoreceptors with green light elicited biphasic responses characterized by initial transient hyperpolarization followed by prolonged delayed depolarization. To explore the basis for these findings, we used RNA interference to selectively suppress expression of the genes coding either green opsin (GO1) or UV opsin (UVO) or both. The hyperpolarizing component in UV-sensitive photoreceptors was eliminated and the delayed depolarization reduced after GO1 knock-down, suggesting that the hyperpolarization represents fast inhibitory interactions between green- and UV-sensitive photoreceptors. Green-sensitive photoreceptor responses of GO1 knockdowns to flashes of UV/violet were almost exclusively biphasic, while residual responses to green had normal kinetics. Knock-down of UVO reduced the responses of UV-sensitive photoreceptors but had minor effects on delayed depolarization in green-sensitive photoreceptors. Angular sensitivity analysis indicated that delayed depolarization of green-sensitive photoreceptors by violet light originates from excitation of (an)other photoreceptor(s) in the same ommatidium. The angle at which the maximal delayed depolarization was observed in green-sensitive photoreceptors stimulated with violet light did not match the angle of the maximal transient depolarization. In contrast, no significant mismatch was observed for delayed depolarization elicited by green light. These results suggest that the cellular sources of the normal transient and additional delayed depolarization by violet light are separate and distinct." @default.
• W2891739829 created "2018-09-27" @default.
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• W2891739829 date "2018-01-01" @default.
• W2891739829 modified "2023-09-27" @default.
• W2891739829 title "Electrical interactions between photoreceptors in the compound eye of <i>Periplaneta americana</i>" @default.
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• W2891739829 doi "https://doi.org/10.1242/jeb.189340" @default.
• W2891739829 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30224371" @default.
• W2891739829 hasPublicationYear "2018" @default.
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