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Nucleic Acids Research, Vol 24, Issue 13 2525-2527, Copyright © 1996 by Oxford University Press

ARTICLES

Preference for guanosine at first codon position in highly expressed Escherichia coli genes. A relationship with translational efficiency

G Gutierrez, L Marquez and A Marin
Departamento de Genetica, Universidad de Sevilla, Spain.

The variation in base composition at the three codon sites in relation to gene expressivity, the latter estimated by the Codon Adaptation Index, has been studied in a sample of 1371 Escherichia coli genes. Correlation and regression analyses show that increasing expression levels are accompanied by higher frequencies of base G at first, of base A at second and of base C at third codon positions. However, correlation between expressivity and base compositional biases at each codon site was only significant and positive at first codon position. The preference for G-starting codons as gene expression level increases is discussed in terms of translational optimization.
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