title: Function and regulation of let-7 family microRNAs.
abstract: MicroRNAs (miRNAs) are a group of small noncoding RNAs capable of regulating specific gene expression. Let-7 miRNA was first discovered in Caenorhabditis elegans and it is highly conserved in human tissues. The human let- 7 family of miRNA contains 12 members of miRNA. Today, these members have become the most studied miRNAs and they have attracted attention of researchers in various fields, such as development, stem cell biology, aging, and metabolism. Furthermore, there is a large body of evidence linking the loss of let-7 expression and the development of poorly differentiated, aggressive cancers. In addition to the canonical biogenesis pathway, let-7 has been found to be regulated by protein factors, such as RNA binding proteins previously identified as regulators of protein-coding mRNAs. Moreover, the direct interaction between miRNAs has recently been identified as a novel pathway to control let-7 expression. In this review, we discuss the multifaceted roles of let-7 and provide an overview of its regulation at multiple levels.
authors.forename: Jen-Liang
authors.initials: JL
authors.lastname: Su
authors.forename: Pai-Sheng
authors.initials: PS
authors.lastname: Chen
authors.forename: Gunnar
authors.initials: G
authors.lastname: Johansson
authors.affiliation: Institute of Toxicology, National Taiwan University, No. 1, Section 1, Jen-Ai Road, Taipei 100, Taiwan.
authors.forename: Min-Liang
authors.initials: ML
authors.lastname: Kuo
mesh_terms: D000818:Animals; D018507:Gene Expression Regulation, Developmental; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism* / Q000627:therapeutic use; D005810:Multigene Family; D009369:Neoplasms / Q000235:genetics; D020871:RNA Stability
chemical_list: D035683:MicroRNAs; C487931:mirnlet7 microRNA, human