title: RNAi of the circadian clock gene period disrupts the circadian rhythm but not the circatidal rhythm in the mangrove cricket.
abstract: The clock mechanism for circatidal rhythm has long been controversial, and its molecular basis is completely unknown. The mangrove cricket, Apteronemobius asahinai, shows two rhythms simultaneously in its locomotor activity: a circatidal rhythm producing active and inactive phases as well as a circadian rhythm modifying the activity intensity of circatidal active phases. The role of the clock gene period (per), one of the key components of the circadian clock in insects, was investigated in the circadian and circatidal rhythms of A. asahinai using RNAi. After injection of double-stranded RNA of per, most crickets did not show the circadian modulation of activity but the circatidal rhythm persisted without a significant difference in the period from controls. Thus, per is functionally involved in the circadian rhythm but plays no role, or a less important role, in the circatidal rhythm. We conclude that the circatidal rhythm in A. asahinai is controlled by a circatidal clock whose molecular mechanism is different from that of the circadian clock.
authors.affiliation: Graduate School of Science, Osaka City University, Sumiyoshi, Osaka 558-8585, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takekata
authors.forename: Yu
authors.initials: Y
authors.lastname: Matsuura
authors.forename: Shin G
authors.initials: SG
authors.lastname: Goto
authors.forename: Aya
authors.initials: A
authors.lastname: Satoh
authors.forename: Hideharu
authors.initials: H
authors.lastname: Numata
mesh_terms: D000818:Animals; D001483:Base Sequence; D057906:Circadian Clocks / Q000235:genetics* / Q000502:physiology; D002940:Circadian Rhythm / Q000235:genetics* / Q000502:physiology; D017344:Genes, Insect; D006135:Gryllidae / Q000235:genetics* / Q000378:metabolism / Q000502:physiology; D008124:Locomotion; D008297:Male; D034622:RNA Interference; D012330:RNA, Double-Stranded / Q000235:genetics / Q000378:metabolism
chemical_list: D012330:RNA, Double-Stranded