Animal cells and systems

  • 제13권2호
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  • Pages.119-125
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  • 2009
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  • 1976-8354(pISSN)
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  • 2151-2485(eISSN)
한국통합생물학회 (The Korean Society for Integrative Biology)
권호 표지

Identification of a PAS Domain-containing Protein in a Mammalian Hibernator, Murina leucogaster

  • Cho, Sang-Gil (Division of Biological Science and Technology, Yonsei University) ;
  • Kim, Dong-Yong (Division of Biological Science and Technology, Yonsei University) ;
  • Eom, Ki-Hyuk (Division of Biological Science and Technology, Yonsei University) ;
  • Bae, Ki-Ho (Division of Biological Science and Technology, Yonsei University)
  • 발행 : 2009.06.30
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초록

Mammalian hibernation is a type of natural adaptation that allows organisms to avoid harsh environment and to increase the possibility of survival. To investigate the molecular link between circadian and hibernating rhythms in the greater tube-nosed bats, Murina leucogaster, we set out to identify circadian genes that are expressed in bats, with specific focus on the PAS domain by using PCR-based screens. We could isolate a eDNA clone, designated as LPAS1, that encodes a protein of 521 amino acid residues. LPAS1 is closely related with CLOCK family with the highest homology to human CLOCK. Based on RT-PCR analyses, LPAS1 transcripts are ubiquitously present in tissues from both summer active and winter dormant periods. Given that LPAS1 is a member of the bHLH-PAS protein superfamily but lacks polyglutamine transactivation domains, it is likely to function as a repressor for endogenous CLOCK to hinder its roles in promoting transcription. Our result will open a new avenue to further examine the functional interconnection between the circadian clock and the circannual clock such as mammalian hibernation.

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