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The complete nucleotide sequence of prune dwarf ilarvirus RNA1 and virus detection by reverse transcription PCR and triple-antibody sandwich ELISA Rampitsch, Christof

Abstract

A triple antibody sandwich enzyme-linked immunosorbent assay (TAS-ELISA) with a monoclonal antibody was developed and evaluated for the detection of prune dwarf ilarvirus (PDV) in sweet cherry trees {Prunus avium). A reverse transcribed polymerase chain reaction test was also developed to establish the incidence of PDV in 40 sweet cherry trees and to confirm the absence of virus in 15 control trees. Trees with two-thirds of their leaves positive for PDV by TAS-ELISA would be identified with 99% probability by testing four leaves per tree. The monoclonal antibody did not cross- react with Prunus necrotic ringspot ilarvirus in the TASELISA. The nucleotide sequence of PDV RNA1 was determined. The RNA consists of 3374 nucleotides and encodes a single open reading frame of 3168 nucleotides. The putative translation product is 1055 amino acids in length with a calculated molecular mass of 118.9 kDa. Both the nucleic acid and the translated amino acid sequences show stronger homology to RNA1 and the corresponding translation product (ORF1) of alfalfa mosaic alfamovirus (AMV) than' to citrus leaf rugose ilarvirus, the only other ilarvirus for which RNA1 sequence data is available. There is extensive sequence homology in the 3'-untranslated regions of PDV RNA1 and the 3'-regions of other ilarvirus and AMV RNAs. The reported sequence and its single open reading frame conform to the genomic organization typical of the Bromoviridae genus. Clones representing sequence from the 5'and 3'-end of RNA1 were used to construct a deletion-type defective interfering particle and its ability to replicate in vivo was assessed.

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