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• W4293484770 abstract "Hyperconserved genomic sequences have great promise for understanding core biological processes. It has been recently proposed that scores of hyperconserved 5' untranslated regions (UTRs), also known as transcript leaders (hTLs), encode internal ribosome entry sites (IRESes) that drive cap-independent translation, in part, via interactions with ribosome expansion segments. However, the direct functional significance of such interactions has not yet been definitively demonstrated. We provide evidence that the putative IRESes previously reported in Hox gene hTLs are rarely included in transcript leaders. Instead, these regions function independently as transcriptional promoters. In addition, we find the proposed RNA structure of the putative Hoxa9 IRES is not conserved. Instead, sequences previously shown to be essential for putative IRES activity encode a hyperconserved transcription factor binding site (E-box) that contributes to its promoter activity and is bound by several transcription factors, including USF1 and USF2. Similar E-box sequences enhance the promoter activities of other putative Hoxa gene IRESes. Moreover, we provide evidence that the vast majority of hTLs with putative IRES activity overlap transcriptional promoters, enhancers, and 3' splice sites that are most likely responsible for their reported IRES activities. These results argue strongly against recently reported widespread IRES-like activities from hTLs and contradict proposed interactions between ribosomal expansion segment ES9S and putative IRESes. Furthermore, our work underscores the importance of accurate transcript annotations, controls in bicistronic reporter assays, and the power of synthesizing publicly available data from multiple sources." @default.
• W4293484770 created "2022-08-29" @default.
• W4293484770 creator A5006028021 @default.
• W4293484770 creator A5088486292 @default.
• W4293484770 creator A5088627617 @default.
• W4293484770 date "2022-08-29" @default.
• W4293484770 modified "2023-09-30" @default.
• W4293484770 title "False-positive IRESes from <i>Hoxa9</i> and other genes resulting from errors in mammalian 5′ UTR annotations" @default.
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• W4293484770 doi "https://doi.org/10.1073/pnas.2122170119" @default.
• W4293484770 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36037358" @default.
• W4293484770 hasPublicationYear "2022" @default.
• W4293484770 type Work @default.
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