The Distribution of the GC Content in the Spatial Structure of the Fragments of Mitochondrial, Chloroplast, and Bacterial Genomes

The spatial distribution of GC content of fragments of the genomes of chloroplasts, mitochondria and bacteria was considered. It was found that the GC content of fragments of most genomes were distributed not chaotically, but in an orderly manner. Two principal types of distribution were found, gradient and centrally symmetric. Chloroplast genomes had only a gradient distribution. Bacteria had a centrally symmetric distribution for GC-poor genomes, and a gradient distribution for GC-rich ones. Both types of distributions occurred in mitochondria; the type of distribution depended on the type of organism.