First complete genome sequence of a capsicum chlorosis tospovirus isolate from Australia with an unusually large S RNA intergenic region (original) (raw)

Abstract

The first complete genome sequence of capsicum chlorosis virus (CaCV) from Australia was determined using a combination of Illumina HiSeq RNA and Sanger sequencing technologies. Australian CaCV had a tripartite genome structure like other CaCV isolates. The large (L) RNA was 8913 nucleotides (nt) in length and contained a single open reading frame (ORF) of 8634 nt encoding a predicted RNA-dependent RNA polymerase (RdRp) in the viral-complementary (vc) sense. The medium (M) and small (S) RNA segments were 4846 and 3944 nt in length, respectively, each containing two non-overlapping ORFs in ambisense orientation, separated by intergenic regions (IGR). The M segment contained ORFs encoding the predicted non-structural movement protein (NSm; 927 nt) and precursor of glycoproteins (GP; 3366 nt) in the viral sense (v) and vc strand, respectively, separated by a 449-nt IGR. The S segment coded for the predicted nucleocapsid (N) protein (828 nt) and non-structural suppressor of silencing protein (NSs; 1320 nt) in the vc and v strand, respectively. The S RNA contained an IGR of 1663 nt, being the largest IGR of all CaCV isolates sequenced so far. Comparison of the Australian CaCV genome with complete CaCV genome sequences from other geographic regions showed highest sequence identity with a Taiwanese isolate. Genome sequence comparisons and phylogeny of all available CaCV isolates provided evidence for at least two highly diverged groups of CaCV isolates that may warrant re-classification of AIT-Thailand and CP-China isolates as unique tospoviruses, separate from CaCV.

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Acknowledgments

We thank Illumina® for financial support through its Miseq Pilot the Possibilities Grant Programme. Funding support by the Queensland Alliance for Agriculture and Food Innovation is also gratefully acknowledged. SWG was supported by a ‘Faculty for the Future’ Fellowship from the Schlumberger Foundation, The Netherlands.

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Authors and Affiliations

  1. Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD, 4072, Australia
    Shirani Widana Gamage & Ralf G. Dietzgen
  2. Queensland Department of Agriculture, Fisheries and Forestry, AgriScience Queensland, Ecosciences Precint, GPO Box 267, Brisbane, QLD, 4001, Australia
    Denis M. Persley
  3. Institute of Applied Ecology, School of Applied Sciences, Auckland University of Technology, Private Bag 92006, Auckland, 1142, New Zealand
    Colleen M. Higgins

Authors

  1. Shirani Widana Gamage
  2. Denis M. Persley
  3. Colleen M. Higgins
  4. Ralf G. Dietzgen

Corresponding author

Correspondence toRalf G. Dietzgen.

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Widana Gamage, S., Persley, D.M., Higgins, C.M. et al. First complete genome sequence of a capsicum chlorosis tospovirus isolate from Australia with an unusually large S RNA intergenic region.Arch Virol 160, 869–872 (2015). https://doi.org/10.1007/s00705-014-2324-8

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