A variant of Rubus yellow net virus with altered genomic organization

Virus Genes. 2015 Feb;50(1):104-10. doi: 10.1007/s11262-014-1149-6. Epub 2014 Dec 6.

Abstract

Rubus yellow net virus (RYNV) is a member of the genus Badnavirus (family: Caulimoviridae). RYNV infects Rubus species causing chlorosis of the tissue along the leaf veins, giving an unevenly distributed netted symptom in some cultivars of red and black raspberry. Recently, a strain of RYNV was sequenced from a Rubus idaeus plant in Alberta, Canada, exhibiting such symptoms. The viral genome contained seven open reading frames (ORFs) with five of them in the sense-strand, including a large polyprotein. Here we describe a graft-transmissible strain of RYNV from Europe infecting cultivar 'Baumforth's Seedling A' (named RYNV-BS), which was sequenced using rolling circle amplification, enzymatic digestion, cloning and primer walking, and it was resequenced at a 5X coverage. This sequence was then compared with the RYNV-Ca genome and significant differences were observed. Genomic analysis identified differences in the arrangement of coding regions, promoter elements, and presence of motifs. The genomic organization of RYNV-BS consisted of five ORFs (four ORFs in the sense-strand and one ORF in the antisense-strand). ORFs 1, 2, and 3 showed a high degree of homology to RYNV-Ca, while ORFs 4 and 6 of RYNV-BS were quite distinct. Also, the predicted ORFs 5 and 7 in the RYNV-Ca were absent in the RYNV-BS sequence. These differences may account for the lack of aphid transmissibility of RYNV-BS.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Badnavirus / genetics*
  • Badnavirus / isolation & purification*
  • Cluster Analysis
  • DNA, Viral / chemistry
  • DNA, Viral / genetics
  • Europe
  • Gene Order*
  • Genes, Viral
  • Genome, Viral*
  • Molecular Sequence Data
  • Open Reading Frames
  • Phylogeny
  • Plant Diseases / virology
  • Promoter Regions, Genetic
  • Rubus / virology
  • Sequence Analysis, DNA
  • Sequence Homology

Substances

  • DNA, Viral

Associated data

  • GENBANK/KM078034
  • RefSeq/NC_026238