Genome Sequence of the Pea Aphid Acyrthosiphon pisum
Widespread gene duplication in an ancestor of the pea aphid, as suggested by the frequency distribution of synonymous divergence (dS) between pairs of recent paralogs (Reciprocal Best Hits) within pea aphid, honey bee, and Drosophila.
Vertical dotted lines show the estimated average dS between orthologs from different aphid species. 1: A. pisum and Myzus persicae (two species of the tribe Macrosiphini), mean dS = 0.25; 2: A. pisum and Aphis gossypii (tribe Aphidini), mean dS = 0.35 (estimates from ). Paralogs resulting from ancient duplications (dS>1.5) are also abundant in all three genomes (1,449 pairs in aphid, 1,726 in drosophila, 1,010 in bee; not shown).