Figure 5 : Model for the formation of the arcs in dot plots of genome regions that have been inverted since the divergence of the A and B genomes.

From: The genome sequences of Arachis duranensis and Arachis ipaensis, the diploid ancestors of cultivated peanut

Figure 5

Gene densities are shown in gray. (a) The inversion transports repeat-rich, gene-poor DNA to the distal chromosomal region and repeat-poor, gene-rich DNA to the more central region. (b) In the distal region, the inverted segment then loses DNA by recombination-driven deletion, and the more central region gains DNA. (c) Thus, the characteristic arc and atypical gene, repetitive DNA and methylation density patterns are formed. The presence of these atypical patterns indicates that all major genome rearrangements occurred in the A-genome lineage (Supplementary Figs. 16, 24 and 26). (d) An example dot plot comparing A05 and B05 that shows the characteristic arc.