Publications by authors named "Magali Eychenne"
Article Synopsis
- Thousands of endoparasitoid wasp species from the Braconidae and Ichneumonidae families carry domesticated endogenous viruses (DEVs), specifically ichnoviruses (IVs), in their genomes.
- The study focuses on how large quantities of IV virions are produced in the ovary calyx cells of female wasps, especially during pupal and adult stages, and how these virions aid in the successful development of wasp offspring by infecting host insects.
- Researchers generated a detailed genome assembly for the Hyposoter didymator wasp and identified 67 HdIV loci, concluding that a specific gene, U16, is crucial for both the amplification of these loci and the formation of vir
Upon infection, the phenoloxidase system in arthropods is rapidly mobilized and constitutes a major defense system against invaders. The activation of the key enzymes prophenoloxidase (PPO) and their action in immunity through melanization and encapsulation of foreign bodies in hemolymph has been described in many insects. On the other hand, little is known about PPOs involvement in other essential functions related to insect development.
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- The study explores how ichneumonid parasitic wasps have integrated viral genes into their genomes, enabling them to produce virus-derived particles known as ichnoviruses (IVs), which aid in the infestation of their hosts.
- Researchers focused on specific regions in the wasp genomes called IVSPERs, which contain putative viral genes believed to be crucial for the formation and transport of these virus-derived particles within the wasp's ovarian cells.
- By using RNA interference and electron microscopy, the study identifies these IVSPER genes and suggests that they have evolved to function as vehicles for delivering virulence genes to the host, showcasing the benefits of viral gene retention in these organisms.*
Polydnaviruses (PDVs) are obligatory symbionts found in thousands of endoparasitoid species and essential for successful parasitism. The two genera of PDVs, ichnovirus (IV) and bracovirus (BV), use different sets of virulence factors to ensure successful parasitization of the host. Previous studies have shown that PDVs target apoptosis, one of the innate antiviral responses in many host organisms.
View Article and Find Full Text PDFThe bacterial pathogen Erwinia amylovora causes the devastating disease known as fire blight in some rosaceous plants including apple and pear. One of the pathogenicity factors affecting fire blight development is the production of a siderophore, desferrioxamine, which overcomes the limiting conditions in plant tissues and also protects bacteria against active oxygen species. In this paper we examine the effect of an iron chelator protein encoded by the pea ferritin gene on the fire blight susceptibility of pear (Pyrus communis).
View Article and Find Full Text PDF* Coffea arabica (Arabica) and Coffea canephora (Robusta) are the two main cultivated species used for coffee bean production. Arabica genotypes generally produce a higher coffee quality than Robusta genotypes. Understanding the genetic basis for sucrose accumulation during coffee grain maturation is an important goal because sucrose is an important coffee flavor precursor.
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