Studies of the Drosophila norpA phototransduction mutant. I. Electrophysiological changes and the offsetting effect of light

The electrophysiological characteristics of norpA super(H52), a temperature sensitive phototransduction mutant of Drosophila melanogaster , were studied in vivo. The authors conclude that the primary defect of norpA affects the efficiency of the phototransduction process. The study indicates that the PI cycle, which is inhibited in norpA mutants, is an important light-sensitive positive step or effector in the production of receptor potential responses.