title: Promoter analysis for daily expression of Drosophila timeless gene.
abstract: Drosophila circadian clock gene timeless (tim) displays circadian oscillation in its mRNA level, and such oscillation is transcriptionally regulated. The promoter region up to -756 of tim is suggested to promote the circadian mRNA expression, however, the role of the sequence upstream of tim promoter region in the transcriptional regulation is still unrevealed. We novelly isolated and determined tim 5'-flanking sequence -2764 to -757, and found a putative cAMP-response element, six regions of the half site for PAR-basic leucine zipper transcription factors and six nonpalindromic E-boxes. Our in vivo reporter assay showed that 966 bp of tim promoter region, including a palindromic CACGTG E-box and a half site of PAR-basic leucine zipper transcription factors, was minimally required for its daily mRNA expression. While, the deletion of the 5'-flanking region -1970 to -967 caused a slight decrease in the reporter mRNA levels. These results indicate that the 5'-flanking sequence upstream of the promoter region have a role in the daily regulation of tim mRNA expression in Drosophila.
authors.affiliation: Clock Cell Biology Group, Institute of Molecular and Cell Biology, Tsukuba Center, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 6, 1-1 Higashi 1-Chome, Tsukuba, Ibaraki, 305-8566, Japan
authors.forename: T
authors.initials: T
authors.lastname: Okada
authors.forename: T
authors.initials: T
authors.lastname: Sakai
authors.forename: T
authors.initials: T
authors.lastname: Murata
authors.forename: K
authors.initials: K
authors.lastname: Kako
authors.forename: K
authors.initials: K
authors.lastname: Sakamoto
authors.forename: M
authors.initials: M
authors.lastname: Ohtomi
authors.forename: T
authors.initials: T
authors.lastname: Katsura
authors.forename: N
authors.initials: N
authors.lastname: Ishida
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D001483:Base Sequence; D002940:Circadian Rhythm / Q000235:genetics*; D017931:DNA Primers / Q000235:genetics; D029721:Drosophila Proteins; D004331:Drosophila melanogaster / Q000235:genetics*; D005786:Gene Expression Regulation; D017344:Genes, Insect; D019476:Insect Proteins / Q000235:genetics*; D007763:Lac Operon; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000235:genetics; D014158:Transcription, Genetic
chemical_list: D017931:DNA Primers; D029721:Drosophila Proteins; D019476:Insect Proteins; D012333:RNA, Messenger; C096445:tim protein, Drosophila