Symbiosis is well known to influence bacterial symbiont genome evolution and has recently been shown to shape eukaryotic host genomes. Intriguing patterns of host genome evolution, including remarkable numbers of gene duplications, have been observed in the pea aphid, a sap-feeding insect that relies on a bacterial endosymbiont for amino acid provisioning. Previously, we proposed that gene duplication has been important for the evolution of symbiosis based on aphid-specific gene duplication in amino acid transporters (AATs), with some paralogs highly expressed in the cells housing symbionts (bacteriocytes). Here, we use a comparative approach to test the role of gene duplication in enabling recruitment of AATs to bacteriocytes. Using genomic and transcriptomic data, we annotate AATs from sap-feeding and non sap-feeding insects and find that, like aphids, AAT gene families have undergone independent large-scale gene duplications in three of four additional sap-feeding insects. RNA-seq differential expression data indicate that, like aphids, the sap-feeding citrus mealybug possesses several lineage-specific bacteriocyte-enriched paralogs. Further, differential expression data combined with quantitative PCR support independent evolution of bacteriocyte enrichment in sap-feeding insect AATs. Although these data indicate that gene duplication is not necessary to initiate host/symbiont amino acid exchange, they support a role for gene duplication in enabling AATs to mediate novel host/symbiont interactions broadly in the sap-feeding suborder Sternorrhyncha. In combination with recent studies on other symbiotic systems, gene duplication is emerging as a general pattern in host genome evolution.

Department of Biology Indiana University Bloomington IN 47405 USA

Department of Biology University of Miami Coral Gables FL 33146 USA

Department of Ecology and Evolution and Consortium for Inter Disciplinary Environmental Research State University of New York at Stony Brook Stony Brook NY 11794 USA

Division of Biological Sciences University of Montana Missoula MT 59812 USA

Faculty of Science University of South Bohemia and Institute of Parasitology Czech Academy of Sciences Ceske Budejovice 37005 Czech Republic

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