Antiphase circadian expression between BMAL1 and period homologue mRNA in the suprachiasmatic nucleus and peripheral tissues of rats.
BMAL1 is a putative transcription factor which is involved in circadian rhythm generation in Drosophila. Northern blot analysis was performed to investigate the expression of rat BMAL1 mRNA in the suprachiasmatic nucleus (SCN) and peripheral tissues. In the SCN, circadian expression of BMAL1 mRNA which reaches its peak level at the time of dark-light transition was observed, and the expression pattern was antiphase to those of two period (per) homologues, rPer1 and rPer2. However, no circadian oscillation for rat Clock mRNA was detected. The circadian expression of BMAL1 mRNA was also observed in peripheral tissues such as brain (excluding the SCN), eye, heart, kidney, and lung. The amplitudes of BMAL1 and rPer2 mRNA expression levels were correlated between the different tissues, suggesting that the circadian expression of BMAL1 mRNA plays an important role in generating the circadian expression of per homologue genes in mammals.
Oishi
K
K
National Institute of Bioscience and Human Technology, Agency of Industrial Science and Technology, Tsukuba, Japan.
Sakamoto
K
K
Okada
T
T
Nagase
T
T
Ishida
N
N
D056930:ARNTL Transcription Factors; D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins; D015152:Blotting, Northern; D056926:CLOCK Proteins; D018797:Cell Cycle Proteins; D002940:Circadian Rhythm / Q000235:genetics*; D003624:Darkness; D008297:Male; D009687:Nuclear Proteins / Q000096:biosynthesis / Q000235:genetics*; D009928:Organ Specificity / Q000235:genetics; D056950:Period Circadian Proteins; D012333:RNA, Messenger / Q000096:biosynthesis*; D051381:Rats; D017208:Rats, Wistar; D012689:Sequence Homology, Nucleic Acid; D013493:Suprachiasmatic Nucleus / Q000378:metabolism*; D015534:Trans-Activators / Q000235:genetics; D014157:Transcription Factors / Q000096:biosynthesis / Q000235:genetics*
D056930:ARNTL Transcription Factors; D051792:Basic Helix-Loop-Helix Proteins; D056926:CLOCK Proteins; D018797:Cell Cycle Proteins; D009687:Nuclear Proteins; D056950:Period Circadian Proteins; D012333:RNA, Messenger; D015534:Trans-Activators; D014157:Transcription Factors; C538960:BMAL1 protein, human; C513311:Per2 protein, rat; C538943:CLOCK protein, human; C538945:Clock protein, rat