Blunervirus

Blunervirus est un genre de virus de la famille des Kitaviridae, créé en 2016, qui comprend 2 espèces acceptées par l'ICTV. Ce sont des virus à ARN linéaire à simple brin à polarité positive, qui infectent des plantes (phytovirus). La famille est rattachée au groupe IV de la classification Baltimore.

Le BNRBV (Blueberry necrotic ring blotch virus) pourrait être transmis par des acariens du genre Calacarus de la famille des Eriophyidae. Le mécanisme spécifique par lequel le vecteur transmet le virus n'est pas connu[2].

Étymologie

Le nom générique, « Blunervirus », est une combinaison dérivée du nom de l'espèce-type, Blueberry necrotic ring blotch virus[3].

Structure

Le génome est segmenté, quadripartite, linéaire, et constitué d'ARN simple brin de polarité positive. Les quatre segments, ARN1, ARN2, ARN3 et ARN4, ont une taille d'environ 5,9, 3,9, 2,6 et 1,7 kb respectivement. L'ARN génomique est coiffé, mais non polyadénylé[3].

Les ARN génomiques servent d'ARN messagers. L'ARN1 contient un cadre de lecture ouvert (ORF) codant les domaines méthyltransférase, protéase et hélicase. L'ARN2 code un second domaine hélicase et un domaine ARN polymérase dépendant de l'ARN (RdRp). L'ARN3 contient cinq ORF codant les protéines p7, p9, p22, p28 et p31 et l'ARN4 semble coder une protéine de mouvement[3].

Liste des espèces

Selon NCBI (20 janvier 2021)[4] :

Notes et références

  1. ICTV. International Committee on Taxonomy of Viruses. Taxonomy history. Published on the Internet https://talk.ictvonline.org/., consulté le 23 janvier 2021
  2. (en) C. Burkle, J.W. Olmstead, P.F. Harmon, « A potential vector of Blueberry necrotic ring blotch virus and symptoms on various host genotypes », sur apsnet.org, American Phytopathological Society (APS) (consulté le ).
  3. a b et c (en) « Blunervirus », sur ViralZone (consulté le ).
  4. NCBI, consulté le 20 janvier 2021

Liens externes

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