Cited by 781Circadian rhythm and melatoninSleep and Wakefulness ResearchLight effects on plants

Two period Homologs: Circadian Expression and Photic Regulation in the Suprachiasmatic Nuclei

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Shearman, Lauren P., Zylka, Mark J., Weaver, David R., Kolakowski, Lee F., Reppert, Steven M.·1997·Neuron

Abstract

We have characterized a mammalian homolog of the Drosophila period gene and designated it Per2. The PER2 protein shows >40% amino acid identity to the protein of another mammalian per homolog (designated Per1) that was recently cloned and characterized. Both PER1 and PER2 proteins share several regions of homology with the Drosophila PER protein, including the protein dimerization PAS domain. Phylogenetic analysis supports the existence of a family of mammalian per genes. In the mouse, Per1 and Per2 RNA levels exhibit circadian rhythms in the SCN and eyes, sites of circadian clocks. Both Per1 and Per2 RNAs in the SCN are increased by light exposure during subjective night but not during subjective day. The results advance our knowledge of candidate clock elements in mammals.

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Crossref · 10.1016/s0896-6273(00)80417-1

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  • Light exposure during the night phase shifts the clock transcription-translation cycle by rapidly inducing expression of Per1 or Per2, depending on whether the light occurs during the early or late night.

    “Light exposure during the night phase shifts the clock transcription-translations cycle by rapidly inducing expression of Per1 or Per2, depending on whether the light occurs during the early or late night42–44.”

    From Circadian rhythm disruption and mental health (2020) · cites this paper as [43]

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Authors
Shearman, L. P., Zylka, M. J., Weaver, D. R., Kolakowski, L. F., & Reppert, S. M.
Affiliations
  • Harvard University (US)
  • The University of Texas at San Antonio Health Science Center (US)
Corresponding author
Reppert, Steven M.
Venue
Neuron
Publisher
Elsevier BV
Published
1997-12
Volume
19
Issue
6
Pages
1261-1269
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2048466060
Cited by
781
References
35
Citations by year
2026: 10 · 2025: 14 · 2024: 10 · 2023: 12 · 2022: 24 · 2021: 22 · 2020: 10 · 2019: 21 · 2018: 16 · 2017: 19 · 2016: 21 · 2015: 20 · 2014: 16 · 2013: 26 · 2012: 22
FWCI
14.29
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (4r37hd014427-17, 5f31mh011547-02)
  • National Institute of Mental Health (MH11547)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R 37 HD14427)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
Keywords
period gene, Per2, Per1, circadian clock, suprachiasmatic nucleus, circadian gene expression, PAS domain, phylogenetic analysis, clock genes, light exposure, subjective night
MeSH terms
Amino Acid Sequence, Animals, Circadian Rhythm, Drosophila, Gene Expression Regulation, Multigene Family, Humans, Light, Male, Mice, Inbred C57BL, Molecular Sequence Data, Nuclear Proteins, Phylogeny, Suprachiasmatic Nucleus, Transcription Factors, Sequence Alignment, Sequence Homology, Amino Acid, DNA, Complementary, Cell Cycle Proteins, Drosophila Proteins, Mice, Period Circadian Proteins

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