Abstract
Aphids are important model organisms in ecological, developmental, and evolutionary studies of, for example, symbiosis, insect-plant interactions, pest management, and developmental polyphenism. Here, we review the recent progress made in the genomics of aphids and their symbionts: hologenomics. The reference genome of Acyrthosiphon pisum has been greatly improved, and chromosome-level assembly is now available. The genomes of over 20 aphid species have been sequenced, and comparative genomic analyses have revealed pervasive gene duplication and dynamic chromosomal rearrangements. Over 120 symbiont genomes (both obligate and facultative) have been sequenced, and modern deep-sequencing technologies have identified novel symbionts. The advances in hologenomics have helped to elucidate the dynamic evolution of facultative and co-obligate symbionts with the ancient obligate symbiont Buchnera.
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