Sequencing, genome analysis and prevalence of a cytorhabdovirus discovered in Carica papaya

PLoS One. 2019 Jun 20;14(6):e0215798. doi: 10.1371/journal.pone.0215798. eCollection 2019.

Abstract

The complete genome of a new rhabdovirus infecting papaya (Carica papaya L.) in Ecuador, named papaya virus E, was sequenced and characterized. The negative-sense single-stranded RNA genome consists of 13,469 nucleotides with six canonical open reading frames (ORFs) and two accessory short ORFs predicted between ORFs corresponding to P3 (movement protein) and M (matrix protein). Phylogenetic analyses using amino acid sequences from the nucleocapsid, glycoprotein and polymerase, grouped the virus with members of the genus Cytorhabdovirus, with rice stripe mosaic virus, yerba mate chlorosis-associated virus and Colocasia bobone disease-associated virus as closest relatives. The 3' leader and 5' trailer sequences were 144 and 167 nt long, respectively, containing partially complementary motifs. The motif 3'-AUUCUUUUUG-5', conserved across rhabdoviruses, was identified in all but one intergenic regions; whereas the motif 3'-ACAAAAACACA-5' was found in three intergenic junctions. This is the first complete genome sequence of a cytorhabdovirus infecting papaya. The virus was prevalent in commercial plantings of Los Ríos, the most important papaya producing province of Ecuador. Recently, the genome sequence of bean-associated cytorhabdovirus was reported. The genome is 97% identical to that of papaya virus E, indicating that both should be considered strains of the same virus.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carica / genetics
  • Carica / virology*
  • Genome Size
  • Genome, Viral
  • High-Throughput Nucleotide Sequencing
  • Open Reading Frames
  • Phylogeny
  • Plant Viruses / genetics
  • Rhabdoviridae / classification*
  • Rhabdoviridae / genetics
  • Whole Genome Sequencing / methods*

Grants and funding

This work was funded by Escuela Superior Politécnica del Litoral (ESPOL), through the Ecuadorean Universities Network for Research and Postdoctoral Studies (REDU) grant # PREDU-2016-001 to DFQ-A. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.