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Comparative 3'UTR analysis allows identification of regulatory clusters that drive Eph/ephrin expression in cancer cell lines

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Item Type:Article
Title:Comparative 3'UTR analysis allows identification of regulatory clusters that drive Eph/ephrin expression in cancer cell lines
Creators Name:Winter, J. and Roepcke, S. and Krause, S. and Mueller, E.C. and Otto, A. and Vingron, M. and Schweiger, S.
Abstract:Eph receptors are the largest family of receptor tyrosine kinases. Together with their ligands, the ephrins, they fulfill multiple biological functions. Aberrant expression of Ephs/ephrins leading to increased Eph receptor to ephrin ligand ratios is a critical factor in tumorigenesis, indicating that tight regulation of Eph and ephrin expression is essential for normal cell behavior. The 3'-untranslated regions (3'UTRs) of transcripts play an important yet widely underappreciated role in the control of protein expression. Based on the assumption that paralogues of large gene families might exhibit a conserved organization of regulatory elements in their 3'UTRs we applied a novel bioinformatics/molecular biology approach to the 3'UTR sequences of Eph/ephrin transcripts. We identified clusters of motifs consisting of cytoplasmic polyadenylation elements (CPEs), AU-rich elements (AREs) and HuR binding sites. These clusters bind multiple RNA-stabilizing and destabilizing factors, including HuR. Surprisingly, despite its widely accepted role as an mRNA-stabilizing protein, we further show that binding of HuR to these clusters actually destabilizes Eph/ephrin transcripts in tumor cell lines. Consequently, knockdown of HuR greatly modulates expression of multiple Ephs/ephrins at both the mRNA and protein levels. Together our studies suggest that overexpression of HuR as found in many progressive tumors could be causative for disarranged Eph receptor to ephrin ligand ratios leading to a higher degree of tissue invasiveness.
Keywords:3' Untranslated Regions, Amino Acid Motifs, Base Sequence, Cytoplasm, Eph Family Receptors, Ephrin-A1, Ephrin-B2, Molecular Sequence Data, Neoplastic Gene Expression Regulation, Nucleic Acid Sequence Homology, RNA-Binding Proteins, Surface Antigens, Tumor Cell Line, Animals, Mice
Source:PLoS ONE
Publisher:Public Library of Science
Page Range:e2780
Date:23 July 2008
Official Publication:https://doi.org/10.1371/journal.pone.0002780
PubMed:View item in PubMed

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