Molecular characterization of a Chinese isolate of potato virus A (PVA) and evidence of a genome recombination event between PVA variants at the 3′-proximal end of the genome

Molecular characterization of a Chinese isolate of potato virus A (PVA) and evidence of a genome... Potato plants that exhibited mosaic symptoms were collected in Xiangxi, Hunan province, China. Multiplex RT-PCR screening for common viruses revealed the presence of potato virus A (PVA) in these samples. ELISA with virus-specific antibodies confirmed infection by PVA in the plants. Rod-shaped virions of ~750 nm in length and ~13 nm in width were observed by transmission electron microscopy. One virus isolate (designated PVA-Hunan) was subjected to molecular characterization. The viral genome consisted of 9,567 nucleotides, excluding the poly(A) tail, and encoded a polyprotein of 3,059 amino acids. A second characteristic potyvirus open reading frame (ORF), pretty interesting Potyviridae ORF ( pipo ), was located at nucleotides 2,834-3,139. The isolate shared 84 % to 98 % and 93 % to 99 % sequence identity with other PVA isolates at the nucleotide and amino acid level, respectively. Phylogenetic analysis demonstrated that, within the PVA group, PVA-Hunan clustered most closely with the Finnish isolate Her, then with isolates 143, U, Ali, M and B11. The isolate TamMV stood alone at a separate branch. However, scanning of complete genome sequences using SimPlot revealed 99 %-sequence identity between PVA-Hunan and TamMV in the 3′-proximal end of the genome (~nt 9,160 to the 3′end) and a 50 %-94 % (average ~83 %) identity upstream of nt 9,160. In contrast, 98 % identity between PVA-Hunan and isolates M and B11 was detected for nucleotides 1 to ~9,160, but only ~94 % for the 3′-proximal region, suggesting a genome recombination event (RE) at nt 9,133. The recombination breakpoint also was identified by the Recombination Detection Program (RDP). The RE was further confirmed by analysis of the CP gene, where the apparent RE was located. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Virology Springer Journals

Molecular characterization of a Chinese isolate of potato virus A (PVA) and evidence of a genome recombination event between PVA variants at the 3′-proximal end of the genome

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Publisher
Springer Vienna
Copyright
Copyright © 2014 by Springer-Verlag Wien
Subject
Biomedicine; Virology; Medical Microbiology; Infectious Diseases
ISSN
0304-8608
eISSN
1432-8798
D.O.I.
10.1007/s00705-014-2053-z
Publisher site
See Article on Publisher Site

Abstract

Potato plants that exhibited mosaic symptoms were collected in Xiangxi, Hunan province, China. Multiplex RT-PCR screening for common viruses revealed the presence of potato virus A (PVA) in these samples. ELISA with virus-specific antibodies confirmed infection by PVA in the plants. Rod-shaped virions of ~750 nm in length and ~13 nm in width were observed by transmission electron microscopy. One virus isolate (designated PVA-Hunan) was subjected to molecular characterization. The viral genome consisted of 9,567 nucleotides, excluding the poly(A) tail, and encoded a polyprotein of 3,059 amino acids. A second characteristic potyvirus open reading frame (ORF), pretty interesting Potyviridae ORF ( pipo ), was located at nucleotides 2,834-3,139. The isolate shared 84 % to 98 % and 93 % to 99 % sequence identity with other PVA isolates at the nucleotide and amino acid level, respectively. Phylogenetic analysis demonstrated that, within the PVA group, PVA-Hunan clustered most closely with the Finnish isolate Her, then with isolates 143, U, Ali, M and B11. The isolate TamMV stood alone at a separate branch. However, scanning of complete genome sequences using SimPlot revealed 99 %-sequence identity between PVA-Hunan and TamMV in the 3′-proximal end of the genome (~nt 9,160 to the 3′end) and a 50 %-94 % (average ~83 %) identity upstream of nt 9,160. In contrast, 98 % identity between PVA-Hunan and isolates M and B11 was detected for nucleotides 1 to ~9,160, but only ~94 % for the 3′-proximal region, suggesting a genome recombination event (RE) at nt 9,133. The recombination breakpoint also was identified by the Recombination Detection Program (RDP). The RE was further confirmed by analysis of the CP gene, where the apparent RE was located.

Journal

Archives of VirologySpringer Journals

Published: Sep 1, 2014

References

  • Expression and function of potyviral gene products
    Dougherty, WG; Carrington, JC

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