Jun 19, 2014

Chromosome-scale genome assemblies of aphids reveal extensively rearranged autosomes and long-term conservation of the X chromosome

BioRxiv : the Preprint Server for Biology
Jennifer LachowiecSaskia A Hogenhout

Abstract

Large-scale chromosome rearrangements are arguably the most dramatic type of mutations, often leading to rapid evolution and speciation. However, chromosome dynamics have only been studied at the sequence level in a small number of model systems. In insects, Diptera (flies and mosquitoes) and Lepidoptera (butterflies and moths) have high levels of chromosome conservation. Whether this truly reflects the diversity of insect genome evolution is questionable given that many species exhibit rapid karyotype evolution. Here, we investigate chromosome evolution in aphids - an important group of hemipteran plant pests - using newly generated chromosome-scale genome assemblies of the green peach aphid ( Myzus persicae ) and the pea aphid ( Acyrthosiphon pisum ), and a previously published chromosome-scale assembly of the corn-leaf aphid ( Rhopalosiphum maidis ). We find that aphid autosomes have undergone dramatic reorganisation over the last 30 million years, to the extent that chromosome homology cannot be determined between aphids from the tribes Macrosiphini ( M. persicae and A. pisum ) and Aphidini ( R. maidis ). In contrast, gene content of the aphid sex (X) chromosome remained unchanged despite rapid sequence evolution, low gene ...Continue Reading

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Mentioned in this Paper

Heat shock proteins
MRNA Maturation
HSP90AA1 gene
Promoter
Biologic Development
HSP90 Heat-Shock Proteins
Gene Expression
Staphylococcal Protein A
HSPD1
HSP90AA1

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