Encodes a non-conducting form of Ork1; carries the amino acid replacements G107A, Y108A, G109A, G219A, F220A and G221A.
Flies expressing Ork1Δ-NC.Scer\UAS.T:Avic\GFP-EGFP in dorsomedial lateral ventral subset LNv neurons, under the regulation of Scer\GAL4P2.4.Pdf exhibit steady, free-running circadian rhythms of locomotor activity with a single statistically significant period of approximately 24.5 hrs, as in wild-type.
Expression of Ork1Δ-NC.Scer\UAS.T:Avic\GFP-EGFP in all larval clock neurons (four LNs plus approximately 8 other neurons in each lobe) under the control of Scer\GAL4tim.Scer\UAS results in larvae that do not display photophobic behaviour.
Only 3% of flies expressing Ork1Δ-NC.Scer\UAS.T:Avic\GFP-EGFP under the control of Scer\GAL4P2.4.Pdf are arrhythmic with respect to free-running locomotor activity. In LD conditions, flies expressing Ork1Δ-NC.Scer\UAS.T:Avic\GFP-EGFP under the control of Scer\GAL4P2.4.Pdf begin to increase their activity about 2 hours before lights-off (as do wild-type flies).
Ork1Δ-NC.UAS.EGFP, Scer\GAL4P2.4.Pdf is a non-suppressor of abnormal locomotor rhythm phenotype of Hsap\KCNJ2UAS.EGFP, Scer\GAL4P2.4.Pdf
Expression of Hsap\KCNJ2Scer\UAS.T:Avic\GFP-EGFP with Ork1Δ-NC.Scer\UAS.T:Avic\GFP-EGFP, under the control of Scer\GAL4P2.4.Pdf induces behavioural arrhythmicity in over 60% of flies.