title: MYC and the art of microRNA maintenance.
abstract: MYC is a noncanonical transcription factor that binds to thousands of genomic loci and affects >15% of the human transcriptome, with surprisingly little overlap between MYC-bound and -regulated genes. This discordance raises the question whether MYC chooses its targets based on their individual biological effects ("a la carte") or by virtue of belonging to a certain group of genes (on a "prix fixe" basis). This review presents evidence for a prix fixe, posttranscriptional model whereby MYC initially deregulates a select number of microRNAs. These microRNAs then target a broad spectrum of genes based solely on the presence in their 3' UTRs (untranslated regions) of distinct "seed" sequences. Existing evidence suggests that there are significant microRNA components to all key MYC-driven phenotypes, including cell-cycle progression, apoptosis, metabolism, angiogenesis, metastasis, stemness, and hematopoiesis. Furthermore, each of these cell-intrinsic and -extrinsic phenotypes is likely attributable to deregulation of multiple microRNA targets acting in different, yet frequently overlapping, pathways. The habitual targeting of multiple genes within the same pathway might account for the robustness and persistence of MYC-induced phenotypes.
authors.affiliation: Division of Cancer Pathobiology and Center for Childhood Cancer Research, Children's Hospital of Philadelphia and Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104.
authors.forename: James N
authors.initials: JN
authors.lastname: Psathas
authors.affiliation: Division of Cancer Pathobiology and Center for Childhood Cancer Research, Children's Hospital of Philadelphia and Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104.
authors.forename: Andrei
authors.initials: A
authors.lastname: Thomas-Tikhonenko
mesh_terms: D017209:Apoptosis / Q000502:physiology; D002453:Cell Cycle / Q000502:physiology; D006410:Hematopoiesis / Q000502:physiology; D006801:Humans; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D008938:Mitosis / Q000502:physiology; D018919:Neovascularization, Physiologic / Q000502:physiology; D016271:Proto-Oncogene Proteins c-myc / Q000502:physiology*; D013234:Stem Cells / Q000502:physiology
chemical_list: D035683:MicroRNAs; D016271:Proto-Oncogene Proteins c-myc
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