title: Predicted microRNAs for mammalian circadian rhythms.
abstract: There is little evidence for the involvement of microRNAs (miRs) in the regulation of circadian rhythms, despite the potential relevance of these elements in the posttranscriptional regulation of the clock machinery. The present work aimed to identify miRs targeting circadian genes through a predictive analysis of conserved miRs in mammals. Besides 23 miRs previously associated with circadian rhythms, we found a number of interesting candidate genes, equally predicted by the 3 software programs used, including miR-9, miR-24, miR25, miR-26, miR-27, miR-29, miR-93, miR-211, miR-302, and miR-346. Moreover, several miRs are predicted to be regulated by circadian transcription factors, such as CLOCK/BMAL, DEC2, and REV-ERBalpha. Using real-time PCR we demonstrated that the selected candidate miR-27b showed a daily variation in human leukocytes. This study presents predicted feedback loops for mammalian molecular clock and the first description of an miR with in vivo daily variation in humans.
authors.affiliation: Laboratory of Molecular Biology and Gene Expression Analysis, Universidade Federal de Alagoas, Campus Arapiraca, Alagoas, Brazil.
authors.forename: Diego de Siqueira
authors.initials: Dde S
authors.lastname: Figueredo
authors.forename: Mayara Rodrigues
authors.initials: MR
authors.lastname: Barbosa
authors.forename: Daniel Leite Góes
authors.initials: DL
authors.lastname: Gitaí
authors.forename: Tiago Gomes
authors.initials: TG
authors.lastname: de Andrade
mesh_terms: D020413:3' Untranslated Regions; D000818:Animals; D002940:Circadian Rhythm; D019295:Computational Biology; D005786:Gene Expression Regulation; D006801:Humans; D007962:Leukocytes / Q000378:metabolism*; D051379:Mice; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction; D013045:Species Specificity; D014157:Transcription Factors / Q000378:metabolism
chemical_list: D020413:3' Untranslated Regions; C531388:MIRN27 microRNA, human; D035683:MicroRNAs; D014157:Transcription Factors