Genome Sequencing of the Phytoseiid Predatory Mite Metaseiulus occidentalis Reveals Completely Atomized Hox Genes and Superdynamic Intron Evolution.

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Serval ID
serval:BIB_3E378A9BBF46
Type
Article: article from journal or magazin.
Publication sub-type
Minutes: analyse of a published work.
Collection
Publications
Title
Genome Sequencing of the Phytoseiid Predatory Mite Metaseiulus occidentalis Reveals Completely Atomized Hox Genes and Superdynamic Intron Evolution.
Journal
Genome Biology and Evolution
Author(s)
Hoy M.A., Waterhouse R.M., Wu K., Estep A.S., Ioannidis P., Palmer W.J., Pomerantz A.F., Simão F.A., Thomas J., Jiggins F.M., Murphy T.D., Pritham E.J., Robertson H.M., Zdobnov E.M., Gibbs R.A., Richards S.
ISSN
1759-6653 (Electronic)
ISSN-L
1759-6653
Publication state
Published
Issued date
2016
Peer-reviewed
Oui
Volume
8
Number
6
Pages
1762-1775
Language
english
Abstract
Metaseiulus occidentalis is an eyeless phytoseiid predatory mite employed for the biological control of agricultural pests including spider mites. Despite appearances, these predator and prey mites are separated by some 400 Myr of evolution and radically different lifestyles. We present a 152-Mb draft assembly of the M. occidentalis genome: Larger than that of its favored prey, Tetranychus urticae, but considerably smaller than those of many other chelicerates, enabling an extremely contiguous and complete assembly to be built-the best arachnid to date. Aided by transcriptome data, genome annotation cataloged 18,338 protein-coding genes and identified large numbers of Helitron transposable elements. Comparisons with other arthropods revealed a particularly dynamic and turbulent genomic evolutionary history. Its genes exhibit elevated molecular evolution, with strikingly high numbers of intron gains and losses, in stark contrast to the deer tick Ixodes scapularis Uniquely among examined arthropods, this predatory mite's Hox genes are completely atomized, dispersed across the genome, and it encodes five copies of the normally single-copy RNA processing Dicer-2 gene. Examining gene families linked to characteristic biological traits of this tiny predator provides initial insights into processes of sex determination, development, immune defense, and how it detects, disables, and digests its prey. As the first reference genome for the Phytoseiidae, and for any species with the rare sex determination system of parahaploidy, the genome of the western orchard predatory mite improves genomic sampling of chelicerates and provides invaluable new resources for functional genomic analyses of this family of agriculturally important mites.
Keywords
Acari/genetics, Animals, Genes, Homeobox/genetics, Genome, Genomics, High-Throughput Nucleotide Sequencing, Introns/genetics, Pest Control, Biological, Tetranychidae/genetics, Transcriptome/genetics, Dicer-2 gene duplication, Helitron rolling-circle transposons, Metaseiulus Typhlodromus Galendromus occidentalis, genome assembly, parahaploid sex determination, western orchard predatory mite
Pubmed
Web of science
Open Access
Yes
Create date
20/09/2017 8:55
Last modification date
03/01/2020 17:48
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