Geographic and developmental variation in expression of the circadian rhythm gene, timeless, in the pitcher-plant mosquito, Wyeomyia smithii

D. Mathias, L. Jacky, W. E. Bradshaw, C. M. Holzapfel

Research output: Contribution to journalArticlepeer-review

Abstract

Expression of the circadian rhythm gene timeless was investigated in the pitcher-plant mosquito, Wyeomyia smithii (Coq.), and was found to vary with time of day, instar of diapause, and latitude of origin. The temporal pattern of timeless expression differed between the two diapausing instars and was significantly higher in southern (38-40°N) than in northern (50°N) populations, when diapausing instar was held constant. Expression of timeless is therefore both developmentally and evolutionarily variable. This result provides the first example of a latitudinal difference in the expression of timeless, suggesting that, along with evidence from other insects, timeless has the potential to affect photoperiodic response and its adaptive evolution in temperate seasonal environments.

Original languageEnglish (US)
Pages (from-to)661-667
Number of pages7
JournalJournal of Insect Physiology
Volume51
Issue number6 SPEC. ISS.
DOIs
StatePublished - Jun 2005

Keywords

  • Circadian rhythm
  • Latitude
  • Photoperiodism
  • Stage of diapause
  • timeless

ASJC Scopus subject areas

  • Physiology
  • Insect Science

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