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. 2014 Mar 9;6(3):727–740. doi: 10.1093/gbe/evu052

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© The Author(s) 2014. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Fig. 2.— — Global gene orientation for 1,727 circular bacterial chromosomes. (A) General gene orientation excluding IS-related and RNA-encoding genes. The chromosomes of four major bacterial phyla are represented: Proteobacteria (blue diamonds, 1,009 chromosomes, 3,067,992 genes, leading/lagging strand ratio = 1.07, R²= 0.89), Actinobacteria (red circles, 224 chromosomes, 837,682 genes, ratio = 0.79, R²= 0.82), and Firmicutes and Tenericutes (green triangles, 494 chromosomes, 1,287,236 genes, ratio = 2.58, R²= 0.76). (B) Orientation of IS-related genes (transposases and associated factors) in genomes for the Proteobacteria (44,504 transposase genes, ratio = 1.05, R²= 0.94), Actinobacteria (9,202 transposase genes, ratio = 1.00, R²= 0.92), and Firmicutes and Tenericutes (17,255 transposase genes, ratio = 0.97, R²= 0.79). (C) Correlation between the ratios of IS-gene orientation and no-IS gene orientation is inexistent in Firmicutes.