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Scientific article
English

Alternative splicing within the elk-1 5' untranslated region serves to modulate initiation events downstream of the highly conserved upstream open reading frame 2

Published inMolecular and cellular biology, vol. 32, no. 9, p. 1745-1756
Publication date2012
Abstract

The 5' untranslated region (UTR) plays a central role in the regulation of mammalian translation initiation. Key components include RNA structure, upstream AUGs (uAUGs), upstream open reading frames (uORFs), and internal ribosome entry site elements that can interact to modulate the readout. We previously reported the characterization of two alternatively spliced 5' UTR isoforms of the human elk-1 gene. Both contain two uAUGs and a stable RNA stem-loop, but the long form (5' UTR(L)) was more repressive than the short form (5' UTR(S)) for initiation at the ELK-1 AUG. We now demonstrate that ELK-1 expression arises by a combination of leaky scanning and reinitiation, with the latter mediated by the small uORF2 conserved in both spliced isoforms. In HEK293T cells, a considerable fraction of ribosomes scans beyond the ELK-1 AUG in a reinitiation mode. These are sequestered by a series of out-of-frame AUG codons that serve to prevent access to a second in-frame AUG start site used to express short ELK-1 (sELK-1), an N-terminally truncated form of ELK-1 that has been observed only in neuronal cells. We present evidence that all these events are fine-tuned by the nature of the 5' UTR and the activity of the α subunit of eukaryotic initiation factor 2 and provide insights into the neuronal specificity of sELK-1 expression.

Keywords
  • 5' Untranslated Regions
  • Alternative Splicing
  • Animals
  • Base Sequence
  • Conserved Sequence
  • Humans
  • Molecular Sequence Data
  • Open Reading Frames
  • Protein Binding
  • Ribosomes/metabolism
  • Sequence Alignment
  • Ets-Domain Protein Elk-1/genetics/metabolism
Citation (ISO format)
RAHIM, Gwendoline et al. Alternative splicing within the elk-1 5′ untranslated region serves to modulate initiation events downstream of the highly conserved upstream open reading frame 2. In: Molecular and cellular biology, 2012, vol. 32, n° 9, p. 1745–1756. doi: 10.1128/MCB.06751-11
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Article (Published version)
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Identifiers
ISSN of the journal0270-7306
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