Abstract
Aphids have a high adaptative potential and their capacity to adapt to various environments could be linked with specific expansions in gene repertoires. A large scale acquisition of genomic data has been recently undertaken with the genome of Acyrthosiphon pisum (reference gene set) and EST data from three other species: Myzus persicae, Aphis gossypii and Toxoptera citricida. We identified paralogs through an intra-genomic Reciprocical Best Hit search in A. pisum and highlighted a high and steady level of duplications in A. pisum. We assembled, ESTs, predicted coding sequences and identified pairs of orthologs with A. pisum. We identified a fraction of fast-evolving sequences (high ratio of non-synonymous to synonymous rates) including genes shared by aphids but not identified in non-aphid species. Phylogenetic study of fast-evolving genes (Apo, C002, Spaetzel) shows that rate accelerations and duplication events are linked and could favour the emergence of specific biological functions.
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Ollivier, M., Rispe, C. (2010). Evolutionary Dynamics in the Aphid Genome: Search for Genes Under Positive Selection and Detection of Gene Family Expansions. In: Pontarotti, P. (eds) Evolutionary Biology – Concepts, Molecular and Morphological Evolution. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-12340-5_8
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DOI: https://doi.org/10.1007/978-3-642-12340-5_8
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