The compositional organization and the expression of the Arabidopsis genome

The base composition patterns of genes, coding sequences and gene expressio n levels were analyzed in the available longs sequences (contigs) of Arabid opsis. Chromosome 5 was analyzed in detail and all chromosomes for which se quence data are now available show essentially the same large-scale composi tional properties. Guanine+cytosine levels of genes and of their coding reg ions, as well as gene densities and expression levels, all show a marked te ndency to be higher in the distal regions of. Arabidopsis chromosomes. (C) 2000 Federation of European Biochemical Societies.