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The genome of the cereal pest Sitophilus oryzae : a transposable element haven

Abstract : Abstract Among beetles, the rice weevil Sitophilus oryzae is one of the most important pests causing extensive damage to cereal in fields and to stored grains. S. oryzae has an intracellular symbiotic relationship (endosymbiosis) with the Gram-negative bacterium Sodalis pierantonius and is a valuable model to decipher host-symbiont molecular interactions. We sequenced the Sitophilus oryzae genome using a combination of short and long reads to produce the best assembly for a Curculionidae species to date. We show that S. oryzae has undergone successive bursts of transposable element (TE) amplification, representing 72% of the genome. In addition, we show that many TE families are transcriptionally active, and changes in their expression are associated with insect endosymbiotic state. S. oryzae has undergone a high gene expansion rate, when compared to other beetles. Reconstruction of host-symbiont metabolic networks revealed that, despite its recent association with cereal weevils (30 Kyear), S. pierantonius relies on the host for several amino acids and nucleotides to survive and to produce vitamins and essential amino-acids required for insect development and cuticle biosynthesis. In addition to being an agricultural pest and a valuable endosymbiotic system, S. oryzae can be a remarkable model for studying TE evolution and regulation, along with the impact of TEs on eukaryotic genomes.
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https://hal.inrae.fr/hal-03320933
Contributor : Stefano Colella Connect in order to contact the contributor
Submitted on : Monday, August 16, 2021 - 4:51:01 PM
Last modification on : Monday, September 20, 2021 - 12:00:02 PM

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Nicolas Parisot, Carlos Vargas-Chavez, Clément Goubert, Patrice Baa-Puyoulet, Séverine Balmand, et al.. The genome of the cereal pest Sitophilus oryzae : a transposable element haven. 2021. ⟨hal-03320933⟩

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