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• W1991587024 abstract "Polyadenylation is a 3' mRNA processing event that contributes to gene expression by affecting stability, export and translation of mRNA. Human polyadenylation signals (PAS) have core and auxiliary elements that bind polyadenylation factors upstream and downstream of the cleavage site. The majority of mRNAs do not have optimal upstream and downstream core elements and therefore auxiliary elements can aid in polyadenylation efficiency. Auxiliary elements have previously been identified and studied in a small number of mRNAs. We previously used a global approach to examine auxiliary elements to identify overrepresented motifs by a bioinformatic survey. This predicted information was used to direct our in vivo validation studies, all of which were accomplished using both a tandem in vivo polyadenylation assay and using reporter protein assays measured as luciferase activity. Novel auxiliary elements were placed in a test polyadenylation signal. An in vivo polyadenylation assay was used to determine the strength of the polyadenylation signal. All but one of the novel auxiliary elements enhanced the test polyadenylation signal. Effects of these novel auxiliary elements were also measured by a luciferase assay when placed in the 3' UTR of a firefly luciferase reporter. Two novel downstream auxiliary elements and all of the novel upstream auxiliary elements showed an increase in reporter protein levels. Many well known auxiliary polyadenylation elements have been found to occur in multiple sets. However, in our study, multiple copies of novel auxiliary elements brought reporter protein levels as well as polyadenylation choice back to wild type levels. Structural features of these novel auxiliary elements may also affect the role of auxiliary elements. A MS2 structure placed upstream of the polyadenylation signal can affect polyadenylation in both the positive and negative direction. A large change in RNA structure by using novel complementary auxiliary element also decreased polyadenylation choice and reporter protein levels. Therefore, we conclude that RNA structure has an important role in polyadenylation efficiency." @default.
• W1991587024 created "2016-06-24" @default.
• W1991587024 creator A5035785741 @default.
• W1991587024 creator A5052690597 @default.
• W1991587024 date "2012-10-01" @default.
• W1991587024 modified "2023-10-16" @default.
• W1991587024 title "Novel upstream and downstream sequence elements contribute to polyadenylation efficiency" @default.
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• W1991587024 doi "https://doi.org/10.4161/rna.21957" @default.
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