Evidence from simulation studies for selective constraints on the codon usage of the Angiosperm psbA gene.

ABSTRACT: The codon usage of the Angiosperm psbA gene is atypical for flowering plant chloroplast genes but similar to the codon usage observed in highly expressed plastid genes from some other Plantae, particularly Chlorobionta, lineages. The pattern of codon bias in these genes is suggestive of selection for a set of translationally optimal codons but the degree of bias towards these optimal codons is much weaker in the flowering plant psbA gene than in high expression plastid genes from lineages such as certain green algal groups. Two scenarios have been proposed to explain these observations. One is that the flowering plant psbA gene is currently under weak selective constraints for translation efficiency, the other is that there are no current selective constraints and we are observing the remn

SUBMITTER: Kalkus A 

PROVIDER: S-EPMC8570520 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature