Circadian oscillations outside the optic lobe in the cricket Gryllus bimaculatus

Outa Uryu, Kenji Tomioka

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Although circadian rhythms are found in many peripheral tissues in insects, the control mechanism is still to be elucidated. To investigate the central and peripheral relationships in the circadian organization, circadian rhythms outside the optic lobes were examined in the cricket Gryllus bimaculatus by measuring mRNA levels of period (per) and timeless (tim) genes in the brain, terminal abdominal ganglion (TAG), anterior stomach, mid-gut, testis, and Malpighian tubules. Except for Malpighian tubules and testis, the tissues showed a daily rhythmic expression in either both per and tim or tim alone in LD. Under constant darkness, however, the tested tissues exhibited rhythmic expression of per and tim mRNAs, suggesting that they include a circadian oscillator. The amplitude and the levels of the mRNA rhythms varied among those rhythmic tissues. Removal of the optic lobe, the central clock tissue, differentially affected the rhythms: the anterior stomach lost the rhythm of both per and tim; in the mid-gut and TAG, tim expression became arrhythmic but per maintained rhythmic expression; a persistent rhythm with a shifted phase was observed for both per and tim mRNA rhythms in the brain. These data suggest that rhythms outside the optic lobe receive control from the optic lobe to different degrees, and that the oscillatory mechanism may be different from that of Drosophila.

Original languageEnglish
Pages (from-to)1284-1290
Number of pages7
JournalJournal of Insect Physiology
Volume56
Issue number9
DOIs
Publication statusPublished - Sep 2010

Fingerprint

optic lobe
Gryllidae
Gryllus bimaculatus
oscillation
Malpighian Tubules
abdominal ganglia
Messenger RNA
Malpighian tubules
Circadian Rhythm
midgut
Ganglia
circadian rhythm
Testis
Stomach
testes
stomach
Insect Control
insect control
Darkness
Brain

Keywords

  • Circadian clock
  • Clock gene
  • Cricket
  • Period
  • Peripheral oscillator
  • Timeless

ASJC Scopus subject areas

  • Insect Science
  • Physiology

Cite this

Circadian oscillations outside the optic lobe in the cricket Gryllus bimaculatus. / Uryu, Outa; Tomioka, Kenji.

In: Journal of Insect Physiology, Vol. 56, No. 9, 09.2010, p. 1284-1290.

Research output: Contribution to journalArticle

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