A functional investigation of the suppression of CpG and UpA dinucleotide frequencies in plant RNA virus genomes.

Abstract:

:Frequencies of CpG and UpA dinucleotides in most plant RNA virus genomes show degrees of suppression comparable to those of vertebrate RNA viruses. While pathways that target CpG and UpAs in HIV-1 and echovirus 7 genomes and restrict their replication have been partly characterised, whether an analogous process drives dinucleotide underrepresentation in plant viruses remains undetermined. We examined replication phenotypes of compositionally modified mutants of potato virus Y (PVY) in which CpG or UpA frequencies were maximised in non-structural genes (including helicase and polymerase encoding domains) while retaining protein coding. PYV mutants with increased CpG dinucleotide frequencies showed a dose-dependent reduction in systemic spread and pathogenicity and up to 1000-fold attenuated replication kinetics in distal sites on agroinfiltration of tobacco plants (Nicotiana benthamiana). Even more extraordinarily, comparably modified UpA-high mutants displayed no pathology and over a million-fold reduction in replication. Tobacco plants with knockdown of RDP6 displayed similar attenuation of CpG- and UpA-high mutants suggesting that restriction occurred independently of the plant siRNA antiviral responses. Despite the evolutionary gulf between plant and vertebrate genomes and encoded antiviral strategies, these findings point towards the existence of novel virus restriction pathways in plants functionally analogous to innate defence components in vertebrate cells.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Ibrahim A,Fros J,Bertran A,Sechan F,Odon V,Torrance L,Kormelink R,Simmonds P

doi

10.1038/s41598-019-54853-0

subject

Has Abstract

pub_date

2019-12-04 00:00:00

pages

18359

issue

1

issn

2045-2322

pii

10.1038/s41598-019-54853-0

journal_volume

9

pub_type

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