NDLI: Constitutive expression of the Period1 gene impairs behavioral and molecular circadian rhythms

Content Provider	PubMed Central
Author	Numano, Rika Yamazaki, Shin Umeda, Nanae Samura, Tomonori Sujino, Mitsugu Takahashi, Ri-ichi Ueda, Masatsugu Mori, Akiko Yamada, Kazunori Sakaki, Yoshiyuki Inouye, Shin-ichi T. Menaker, Michael Tei, Hajime
Copyright Year	2006
Abstract	Three mammalian Period (Per) genes, termed Per1, Per2, and Per3, have been identified as structural homologues of the Drosophila circadian clock gene, period (per). The three Per genes are rhythmically expressed in the suprachiasmatic nucleus (SCN), the central circadian pacemaker in mammals. The phases of peak mRNA levels for the three Per genes in the SCN are slightly different. Light sequentially induces the transcripts of Per1 and Per2 but not of Per3 in mice. These data and others suggest that each Per gene has a different but partially redundant function in mammals. To elucidate the function of Per1 in the circadian system in vivo, we generated two transgenic rat lines in which the mouse Per1 (mPer1) transcript was constitutively expressed under the control of either the human elongation factor-1α (EF-1α) or the rat neuron-specific enolase (NSE) promoter. The transgenic rats exhibited an ≈0.6–1.0-h longer circadian period than their wild-type siblings in both activity and body temperature rhythms. Entrainment in response to light cycles was dramatically impaired in the transgenic rats. Molecular analysis revealed that the amplitudes of oscillation in the rat Per1 (rPer1) and rat Per2 (rPer2) mRNAs were significantly attenuated in the SCN and eyes of the transgenic rats. These results indicate that either the level of Per1, which is raised by overexpression, or its rhythmic expression, which is damped or abolished in over expressing animals, is critical for normal entrainment of behavior and molecular oscillation of other clock genes.
Related Links	http://dx.doi.org/10.1073/pnas.0600060103
Ending Page	3721
Page Count	6
Starting Page	3716
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	10
Volume Number	103
Language	English
Publisher	National Academy of Sciences
Publisher Date	2006-03-07
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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