Cited by 421Electromagnetic Fields and Biological EffectsGeomagnetism and Paleomagnetism StudiesCircadian rhythm and melatonin

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Cryptochrome mediates light-dependent magnetosensitivity in Drosophila

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Gegear, Robert J., Casselman, Amy, Waddell, Scott, Reppert, Steven M.·2008·Nature

DOI 10.1038/nature07183PMC PMC2559964

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Abstract

Although many animals use the Earth's magnetic field for orientation and navigation, the precise biophysical mechanisms underlying magnetic sensing have been elusive. One theoretical model proposes that geomagnetic fields are perceived by chemical reactions involving specialized photoreceptors. However, the specific photoreceptor involved in such magnetoreception has not been demonstrated conclusively in any animal. Here we show that the ultraviolet-A/blue-light photoreceptor cryptochrome (Cry) is necessary for light-dependent magnetosensitive responses in Drosophila melanogaster. In a binary-choice behavioural assay for magnetosensitivity, wild-type flies show significant naive and trained responses to a magnetic field under full-spectrum light ( approximately 300-700 nm) but do not respond to the field when wavelengths in the Cry-sensitive, ultraviolet-A/blue-light part of the spectrum (<420 nm) are blocked. Notably, Cry-deficient cry(0) and cry(b) flies do not show either naive or trained responses to a magnetic field under full-spectrum light. Moreover, Cry-dependent magnetosensitivity does not require a functioning circadian clock. Our work provides, to our knowledge, the first genetic evidence for a Cry-based magnetosensitive system in any animal.

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Authors: Gegear, R. J., Casselman, A., Waddell, S., & Reppert, S. M.
Affiliations: University of Massachusetts Chan Medical School (US)
Corresponding author: Reppert, Steven M.
ORCID: Gegear, Robert J.
Waddell, Scott
Reppert, Steven M.
Venue: Nature
Publisher: Springer Science and Business Media LLC
Published: 2008-07-20
Volume: 454
Issue: 7207
Pages: 1014-1018
ISSN: 0028-0836 (ISSN-L)
1476-4687
DOI: 10.1038/nature07183
PMC: PMC2559964
OpenAlex: W2086367365
Cited by: 421
References: 31
Citations by year: 2026: 8 · 2025: 18 · 2024: 11 · 2023: 27 · 2022: 29 · 2021: 26 · 2020: 27 · 2019: 18 · 2018: 28 · 2017: 34 · 2016: 32 · 2015: 27 · 2014: 24 · 2013: 14 · 2012: 19
FWCI: 14.35
Type: journal article
Language: en
Open access: green
www.ncbi.nlm.nih.gov
Licence: www.springer.com/tdm (tdm)
Locations: Nature (publishedVersion)
PubMed (publishedVersion)
PubMed Central (acceptedVersion)
eScholarship@UMassChan (submittedVersion)
RePEc: Research Papers in Economics (submittedVersion)
Funders: National Institute of Mental Health (R01MH069883)
National Institute of Neurological Disorders and Stroke (R01NS047141)
Topics: Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Electromagnetic Fields and Biological Effects
Physical Sciences › Earth and Planetary Sciences › Geophysics › Geomagnetism and Paleomagnetism Studies
Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
Keywords: cryptochrome, magnetoreception, geomagnetic sensing, Drosophila melanogaster, circadian clock
MeSH terms: Animals, Behavior, Animal, Circadian Rhythm, Drosophila melanogaster, Flavoproteins, Light, Magnetics, Mutation, Sensation, Cryptochromes

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Cryptochrome mediates light-dependent magnetosensitivity in Drosophila

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