Torix group Rickettsia are widespread in Culicoides biting midges (Diptera: Ceratopogonidae), reach high frequency and carry unique genomic features

Pilgrim Jack, Ander Mats, Garros Claire, Baylis Matthew, Hurst Gregory D.D., Siozos Stefanos. 2017. Torix group Rickettsia are widespread in Culicoides biting midges (Diptera: Ceratopogonidae), reach high frequency and carry unique genomic features. Environmental Microbiology, 19 (10), n.spéc. Pathogen and Drug Resistance Ecology : 4238-4255.

Quartile : Q1, Sujet : MICROBIOLOGY

Résumé : There is increasing interest in the heritable bacteria of invertebrate vectors of disease as they present novel targets for control initiatives. Previous studies on biting midges (Culicoides spp.), known to transmit several RNA viruses of veterinary importance, have revealed infections with the endosymbiotic bacteria, Wolbachia and Cardinium. However, rickettsial symbionts in these vectors are underexplored. Here, we present the genome of a previously uncharacterized Rickettsia endosymbiont from Culicoides newsteadi (RiCNE). This genome presents unique features potentially associated with host invasion and adaptation, including genes for the complete non-oxidative phase of the pentose phosphate pathway, and others predicted to mediate LPS and cell wall modification. Screening of 414 Culicoides individuals from 29 Palearctic or Afrotropical species revealed Rickettsia represent a widespread but previously overlooked association, reaching high frequencies in midge populations and present in 38% of the species tested. Sequence typing clusters the Rickettsia within the Torix group of the genus, a group known to infect several aquatic and hematophagous taxa. FISH analysis indicated the presence of Rickettsia bacteria in ovary tissue, indicating their maternal inheritance. Given the importance of biting midges as vectors, a key area of future research is to establish the impact of this endosymbiont on vector competence. This article is protected by copyright. All rights reserved.

Mots-clés Agrovoc : Rickettsia, Culicoides, symbiote, génome, flore bactérienne, infection, symbiose, vecteur de maladie, transmission des maladies, interactions biologiques, relation hôte parasite, Cecidomyiidae

Mots-clés complémentaires : Endosymbiote

Classification Agris : L72 - Organismes nuisibles des animaux
L73 - Maladies des animaux

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

• Pilgrim Jack, University of Liverpool (GBR)
• Ander Mats, National Veterinary Institute (SWE)
• Garros Claire, CIRAD-BIOS-UMR ASTRE (REU) ORCID: 0000-0003-4378-5031
• Baylis Matthew, University of Liverpool (GBR)
• Hurst Gregory D.D., University of Liverpool (GBR)
• Siozos Stefanos, University of Liverpool (GBR)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/585234/)

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