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Expression patterns of cryptochrome genes in avian retina suggest involvement of Cry4 in light-dependent magnetoreception

Author:
  • Atticus Pinzon-Rodriguez
  • Staffan Bensch
  • Rachel Muheim
Publishing year: 2018-01-01
Language: English
Publication/Series: Journal of the Royal Society Interface
Volume: 15
Issue: 140
Document type: Journal article
Publisher: The Royal Society of Canada

Abstract english

The light-dependent magnetic compass of birds provides orientation information about the spatial alignment of the geomagnetic field. It is proposed to be located in the avian retina, and be mediated by a light-induced, biochemical radical-pair mechanism involving cryptochromes as putative receptor molecules. At the same time, cryptochromes are known for their role in the negative feedback loop in the circadian clock. We measured gene expression of Cry1, Cry2 and Cry4 in the retina, muscle and brain of zebra finches over the circadian day to assess whether they showed any circadian rhythmicity. We hypothesized that retinal cryptochromes involved in magnetoreception should be expressed at a constant level over the circadian day, because birds use a light-dependent magnetic compass for orientation not only during migration, but also for spatial orientation tasks in their daily life. Cryptochromes serving in circadian tasks, on the other hand, are expected to be expressed in a rhythmic (circadian) pattern. Cry1 and Cry2 displayed a daily variation in the retina as expected for circadian clock genes, while Cry4 expressed at constant levels over time. We conclude that Cry4 is the most likely candidate magnetoreceptor of the light-dependent magnetic compass in birds.

Keywords

  • Zoology
  • Circadian clock
  • Circadian rhythm
  • Clock genes
  • Magnetic compass
  • Orientation

Other

Published
  • Centre for Animal Movement Research
  • ISSN: 1742-5689
Staffan Bensch
E-mail: staffan [dot] bensch [at] biol [dot] lu [dot] se

Professor

MEMEG

+46 46 222 42 92

E-C213

Sölvegatan 37, Lund

50

Head of unit

MEMEG

+46 46 222 42 92

E-C213

Sölvegatan 37, Lund

50

Research group

Molecular Ecology and Evolution Lab

Projects

Doctoral students and postdocs

PhD students, main supervisor

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