title: Comprehensive analysis of microRNA-mRNA co-expression in circadian rhythm.
abstract: To investigate the potential role of microRNA (miRNA) in the regulation of circadian rhythm, we performed microarray-based expression profiling study of both miRNA and mRNA in mouse liver for 48 h at 4-hour intervals. Circadian miRNA-mRNA target pair is defined as the pair both elements of which show circadian expression patterns and the sequence-based target relationship of which can be predicted. Circadian initiators, Clock and Bmal1, showed inversely correlated circadian expression patterns against their corresponding miRNAs, miR-181d and miR-191, targeting them. In contrast, circadian suppressors, Per, Cry, CKIe and Rev-erba, exhibited positively correlated circadian expression patterns to their corresponding miRNAs. Genomic location analysis revealed that intronic region showed higher abundance of cyclic than non-cyclic miRNAs targeting circadian genes while other (i.e., 3-UTR, exon and intergenic) regions showed no difference. It is suggested that miRNAs are involved in the regulation of peripheral circadian rhythm in mouse liver by modulating Clock:Bmal1 complex. Identifying specific miRNAs and their targets that are critically involved in circadian rhythm will provide a better understanding of the regulation of circadian- clock system.
authors.affiliation: Seoul National University Biomedical Informatics (SNUBI), Seoul National University College of Medicine, Seoul 110-799, Korea.
authors.forename: Young Ji
authors.initials: YJ
authors.lastname: Na
authors.forename: Jung Hwan
authors.initials: JH
authors.lastname: Sung
authors.forename: Suk Chan
authors.initials: SC
authors.lastname: Lee
authors.forename: Young Ju
authors.initials: YJ
authors.lastname: Lee
authors.forename: Yeun Joo
authors.initials: YJ
authors.lastname: Choi
authors.forename: Woong Yang
authors.initials: WY
authors.lastname: Park
authors.forename: Hee Sup
authors.initials: HS
authors.lastname: Shin
authors.forename: Ju Han
authors.initials: JH
authors.lastname: Kim
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D008099:Liver / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D035683:MicroRNAs / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics*
chemical_list: D035683:MicroRNAs; D012333:RNA, Messenger