Introns Structure Patterns of Variation in Nucleotide Composition in Arabidopsis thaliana and Rice Protein-Coding Genes.

ABSTRACT: Plant genomes present a continuous range of variation in nucleotide composition (G + C content). In coding regions, G + C-poor species tend to have unimodal distributions of G + C content among genes within genomes and slight 5'-3' gradients along genes. In contrast, G + C-rich species display bimodal distributions of G + C content among genes and steep 5'-3' decreasing gradients along genes. The causes of these peculiar patterns are still poorly understood. Within two species (Arabidopsis thaliana and rice), each representative of one side of the continuum, we studied the consequences of intron presence on coding region and intron G + C content at different scales. By properly taking intron structure into account, we showed that, in both species, intron presence is associated with step ch

SUBMITTER: Ressayre A 

PROVIDER: S-EPMC4684703 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature