2007 Fiscal Year Final Research Report Summary
Molecular mechanism of circadian oscillation by real-time rhythm monitoring
| Project/Area Number |
18390093
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General medical chemistry
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| Research Institution | Osaka Bioscience Institute |
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Principal Investigator |
TAKUMI Toru Osaka Bioscience Institute, Neuroscience, Lab Head (00222092)
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| Co-Investigator(Kenkyū-buntansha) |
TAKANO Atsuko Osaka Bioscience Institute, Neuroscience, 研究員 (70390812)
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| Project Period (FY) |
2006 – 2007
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| Keywords | gene / gene expression / behavior / physiology |
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| Research Abstract |
The circadian expression of the mammalian clock genes is based on transcriptional feedback loops. Two bHLH-PAS domain-containing transcriptional activators, CLOCK and BMAL1, are known to regulate gene expression by interacting with a promoter element termed the E-box (CACGTG). The non-canonical E-boxed or E-box-like sequences have also been reported to be necessary for circadian oscillation. We found a new cis-element required for cell-autonomous circadian transcription of cock genes. This new element consists of a canonical E-box or a non-canonical E-box and an E-box-like sequence in tandem with the latter with a short interval, 6 base pairs, between them. We demonstrated that both E-box or E-box-like sequences are needed to generate cell-autonomous oscillation. We also verified that the spacing nucleotides with constant length between these 2 E-elements are crucial for robust oscillation. Thus, the direct repeat of the E-box-like elements is the minimal required element for the generation of cell-autonomous transcriptional oscillation of clock and clock-controlled genes.
On the other hand, we developed in vivo monitoring of circadian timing in freely moving mice by recording multi-unit neural activity (MIJA). Suprachiasmatic nucleus (SCN), the mammalian circadian center, neural activity is tightly coupled to environmental photic input and anticorrelated with MUA rhythm in the subparaventricular zone (SPZ). In Clock mutant mice exhibiting attenuated circadian locomotor rhythmicity, MUA rhythmicity in the SCN and SPZ is similarly blunted. These results suggest that the SPZ plays a functional role in relaying circadian and photic signals to centers involved in generating behavioral activity.
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[Journal Article] Of mice and men-universalit and breakdown of behavioral organization2008
Author(s)
Nakamura T, Takumi, T., Takano, A., Aoyagi, N., Yoshiuchi, K., Struzik, ZR., Yamamoto, Y.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] In vivomonitoring of circadian timing in freely moving mice.2008
Author(s)
Nakamura, W., Yamazaki, S., Nakamura, TJ., Shirakawa, T., Block, GD., Takumi, T.
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Journal Title
Curr. Biol. 18
Pages: 381-385
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] A direct repeat of E-box-like element is required for cell-autonomous circadian rhythm of clock genes.2008
Author(s)
Nakahata, Y., Yoshida, M., Takano, A., Soma, H., Yamamoto, T., Yasuda, A., Nakatsu, T., Takumi, T.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Myosin-Va facilitates the accumulation of mRNA/Protein (mRNP) complex in dendritic spines.2006
Author(s)
Yoshimura,A.,Fujii,R.,Watanabe,Y,Okabe,S.,Fukui,K.and Takumi,T.
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Journal Title
Curr.Biol. 16
Pages: 2345-2351
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Molecular mechanism of cell-autonomous circadian gene expression of Period2, a crucial regulator of the mammalian circadian clock2006
Author(s)
Akashi, M., Ichise, T., Mamine, T., Fukui, K., Takumi, T.
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Journal Title
Mol. Biol. Cell. 17
Pages: 555-565
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Myosin-Va facilitates the accumulation of mRNA/Protein(mRNP) complex in dendritic spines.2006
Author(s)
Yoshimura, A., Fujii, R., Watanabe, Y., Okabe, S., Fukui, K., Takumi, T.
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Journal Title
Curr. Biol. 16
Pages: 2345-2351
Description
「研究成果報告書概要(欧文)」より
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