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Efficient translation initiation dictates codon usage at gene start

Open access
Bentele, Kajetan, Saffert, Paul, Rauscher, Robert, Ignatova, Zoya, Blüthgen, Nils·2013·Molecular Systems Biology

Abstract

The genetic code is degenerate; thus, protein evolution does not uniquely determine the coding sequence. One of the puzzles in evolutionary genetics is therefore to uncover evolutionary driving forces that result in specific codon choice. In many bacteria, the first 5–10 codons of protein‐coding genes are often codons that are less frequently used in the rest of the genome, an effect that has been argued to arise from selection for slowed early elongation to reduce ribosome traffic jams. However, genome analysis across many species has demonstrated that the region shows reduced mRNA folding consistent with pressure for efficient translation initiation. This raises the possibility that unusual codon usage is a side effect of selection for reduced mRNA structure. Here we discriminate between these two competing hypotheses, and show that in bacteria selection favours codons that reduce mRNA folding around the translation start, regardless of whether these codons are frequent or rare. Experiments confirm that primarily mRNA structure, and not codon usage, at the beginning of genes determines the translation rate.

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Metadata

Authors
Bentele, K., Saffert, P., Rauscher, R., Ignatova, Z., & Blüthgen, N.
Venue
Molecular Systems Biology
Published
2013-01
Volume
9
Issue
1
Pages
675-675
ISSN
1744-4292 (ISSN-L)
OpenAlex
W2157913328
Cited by
309
References
44
FWCI
9.55
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: Efficient translation initiation dictates codon usage at gene start. https://app.cochat.ai/papers/10.1038/msb.2013.32
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Bentele, K., Saffert, P., Rauscher, R., Ignatova, Z., & Blüthgen, N. (2013). Efficient translation initiation dictates codon usage at gene start. Molecular Systems Biology. https://doi.org/10.1038/msb.2013.32

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