Stem-loops, bulges, and pseudoknots within these regions create specific three-dimensional architectures that proteins and RNAs can recognize. The 5' UTR contains sequences that are recognized by the eukaryotic initiation factors (eIFs) and the small ribosomal subunit.
Evolutionary Adaptations of RNA UTR Sequences in Gene Regulation
These structural features are fundamental to the post-transcriptional control of gene expression. For example, the loss of a stabilizing element in the 3' UTR of a proto-oncogene can result in its overexpression and contribute to tumorigenesis.
Similarly, expansions of nucleotide repeats within UTRs, such as the CAG repeats in the Huntingtin gene, can create toxic RNA structures that drive pathology, highlighting the dark side of these regulatory sequences. UTRs also dictate the subcellular localization of the mRNA, directing it to specific compartments within the cell where the protein is needed.
Evolutionary Adaptations of RNA UTR Sequences in Gene Regulation
The Architecture of Control: 5' and 3' UTRs The primary division of RNA untranslated regions occurs between the 5' UTR and the 3' UTR, separated by the open reading frame that encodes the protein. Diagnostic and Therapeutic Potential.
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