title: Micro-RNA regulation of the mammalian lin-28 gene during neuronal differentiation of embryonal carcinoma cells.
abstract: Vertebrate genomes each encode hundreds of micro-RNAs (miRNAs), yet for few of these miRNAs is there empirical evidence as to which mRNA(s) they regulate. Here we report the identification of human lin-28 mRNA as a regulatory target of human miR-125b and its homolog miR-125a. Studies of miR-125b function in mouse P19 embryonal carcinoma cells induced to develop into neurons suggest a role for this regulatory miRNA in mammalian neuronal differentiation, since its increased concentration in these cells contributes to lin-28 downregulation. Within the lin-28 3' untranslated region (UTR) are two conserved miRNA responsive elements (miREs) that mediate repression by miR-125b and miR-125a. Simultaneous deletion of both miREs renders the lin-28 3' UTR almost completely insensitive to these miRNAs, indicating that these two miREs are the principal elements in the lin-28 3' UTR that respond to miR-125. At the 3' end of each element is an adenosine residue that makes a significant contribution to function irrespective of its complementarity to the 5'-terminal nucleotide of miR-125. By contrast to most earlier reports of gene repression by other miRNAs that are imperfectly complementary to their targets, lin-28 downregulation by miR-125 involves reductions in both translational efficiency and mRNA abundance. The decrease in the mRNA concentration is achieved by a posttranscriptional mechanism that is independent of the inhibitory effect on translation.
authors.affiliation: Skirball Institute of Biomolecular Medicine, New York University School of Medicine, 540 First Avenue, New York, NY 10016, USA.
authors.forename: Ligang
authors.initials: L
authors.lastname: Wu
authors.forename: Joel G
authors.initials: JG
authors.lastname: Belasco
mesh_terms: D020413:3' Untranslated Regions / Q000378:metabolism; D000818:Animals; D002454:Cell Differentiation / Q000502:physiology*; D002460:Cell Line; D015536:Down-Regulation; D054278:Embryonal Carcinoma Stem Cells; D017930:Genes, Reporter; D006801:Humans; D051379:Mice; D035683:MicroRNAs / Q000378:metabolism*; D014411:Neoplastic Stem Cells / Q000166:cytology / Q000378:metabolism*; D009474:Neurons / Q000166:cytology / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D020413:3' Untranslated Regions; D035683:MicroRNAs; D012333:RNA, Messenger; D016601:RNA-Binding Proteins