The DOI matches its Crossref record; 6 of the 6 references it cites were found in a registry or an index.
Photic Induction of mPer1 and mPer2 in Cry -Deficient Mice Lacking a Biological Clock
Abstract
Mice lacking mCry1 and mCry2 are behaviorally arrhythmic. As shown here, cyclic expression of the clock genes mPer1 and mPer2 (mammalian Period genes 1 and 2) in the suprachiasmatic nucleus and peripheral tissues is abolished and mPer1 and mPer2 mRNA levels are constitutively high. These findings indicate that the biological clock is eliminated in the absence of both mCRY1 and mCRY2 (mammalian cryptochromes 1 and 2) and support the idea that mammalian CRY proteins act in the negative limb of the circadian feedback loop. The mCry double-mutant mice retain the ability to have mPer1 and mPer2 expression induced by a brief light stimulus known to phase-shift the biological clock in wild-type animals. Thus, mCRY1 and mCRY2 are dispensable for light-induced phase shifting of the biological clock.
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Cites
Molecular Bases for Circadian Clocks
Dunlap, J. C. (1999) · Cell · doi:10.1016/s0092-8674(00)80566-8 · Cited by 2,900
Melanopsin: An opsin in melanophores, brain, and eye
Provencio, I., Jiang, G., De Grip, W. J., Hayes, W. P., & Rollag, M. D. (1998) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.95.1.340 · Cited by 975
A Differential Response of Two Putative Mammalian Circadian Regulators, mper1and mper2, to Light
Albrecht, U., Sun, Z. S., Eichele, G., & Lee, C. C. (1997) · Cell · doi:10.1016/s0092-8674(00)80495-x · Cited by 879
Circadian oscillation of a mammalian homologue of the Drosophila period gene
Tei, H., Okamura, H., Shigeyoshi, Y., Fukuhara, C., Ozawa, R., Hirose, M., & Sakaki, Y. (1997) · Nature · doi:10.1038/39086 · Cited by 792
Self-citationTwo period Homologs: Circadian Expression and Photic Regulation in the Suprachiasmatic Nuclei
Shearman, L. P., Zylka, M. J., Weaver, D. R., Kolakowski, L. F., & Reppert, S. M. (1997) · Neuron · doi:10.1016/s0896-6273(00)80417-1 · Cited by 781
Putative Human Blue-Light Photoreceptors hCRY1 and hCRY2 Are Flavoproteins
Hsu, D. S., Zhao, X., Zhao, S., Kazantsev, A., Wang, R.-P., Todo, T., Wei, Y.-F., & Sancar, A. (1996) · Biochemistry · doi:10.1021/bi962209o · Cited by 291
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Coordination of circadian timing in mammals
Reppert, S. M., & Weaver, D. R. (2002) · Nature · doi:10.1038/nature00965 · Cited by 4,379
Mop3 is an essential component of the master circadian pacemaker in mammals.
Bunger, M. K., Wilsbacher, L. D., Moran, S. M., Clendenin, C., Radcliffe, L. A., Hogenesch, J. B., Simon, M. C., Takahashi, J. S., & Bradfield, C. A. (2000) · Cell · doi:10.1016/s0092-8674(00)00205-1 · Cited by 1,621
Molecular analysis of mammalian circadian rhythms
Reppert, S. M., & Weaver, D. R. (2001) · Annual Review of Physiology · doi:10.1146/annurev.physiol.63.1.647 · Cited by 1,444
Interacting molecular loops in the mammalian circadian clock
Shearman, L. P., Sriram, S., Weaver, D. R., Maywood, E. S., Chaves, I., Zheng, B., Kume, K., Lee, C. C., van der, G. T. J., Horst, et al. (2000) · Science · doi:10.1126/science.288.5468.1013 · Cited by 1,367
Posttranslational Mechanisms Regulate the Mammalian Circadian Clock
Lee, C., Etchegaray, J.-P., Cagampang, F. R. A., Loudon, A. S. I., & Reppert, S. M. (2001) · Cell · doi:10.1016/s0092-8674(01)00610-9 · Cited by 1,160
Metadata
- Authors
- Okamura, H., Miyake, S., Sumi, Y., Yamaguchi, S., Yasui, A., Muijtjens, M., Hoeijmakers, J. H. J., & van der Horst, G. T. J.
- Venue
- Science
- Published
- 1999-12-24
- Volume
- 286
- Issue
- 5449
- Pages
- 2531-2534
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2061764511
- Cited by
- 376
- References
- 6
- FWCI
- 12.59
- Type
- journal article
- Language
- en
- Open access
- closed
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- Okamura, H., Miyake, S., Sumi, Y., Yamaguchi, S., Yasui, A., Muijtjens, M., Hoeijmakers, J. H. J., & van der Horst, G. T. J. (1999). Photic Induction of mPer1 and mPer2 in Cry -Deficient Mice Lacking a Biological Clock. Science. https://doi.org/10.1126/science.286.5449.2531
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
