Tubular structure induced by a plant virus facilitates viral spread in its vector insect.

Abstract:

:Rice dwarf virus (RDV) replicates in and is transmitted by a leafhopper vector in a persistent-propagative manner. Previous cytopathologic and genetic data revealed that tubular structures, constructed by the nonstructural viral protein Pns10, contain viral particles and are directly involved in the intercellular spread of RDV among cultured leafhopper cells. Here, we demonstrated that RDV exploited these virus-containing tubules to move along actin-based microvilli of the epithelial cells and muscle fibers of visceral muscle tissues in the alimentary canal, facilitating the spread of virus in the body of its insect vector leafhoppers. In cultured leafhopper cells, the knockdown of Pns10 expression due to RNA interference (RNAi) induced by synthesized dsRNA from Pns10 gene strongly inhibited tubule formation and prevented the spread of virus among insect vector cells. RNAi induced after ingestion of dsRNA from Pns10 gene strongly inhibited formation of tubules, preventing intercellular spread and transmission of the virus by the leafhopper. All these results, for the first time, show that a persistent-propagative virus exploits virus-containing tubules composed of a nonstructural viral protein to traffic along actin-based cellular protrusions, facilitating the intercellular spread of the virus in the vector insect. The RNAi strategy and the insect vector cell culture provide useful tools to investigate the molecular mechanisms enabling efficient transmission of persistent-propagative plant viruses by vector insects.

journal_name

PLoS Pathog

journal_title

PLoS pathogens

authors

Chen Q,Chen H,Mao Q,Liu Q,Shimizu T,Uehara-Ichiki T,Wu Z,Xie L,Omura T,Wei T

doi

10.1371/journal.ppat.1003032

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

e1003032

issue

11

eissn

1553-7366

issn

1553-7374

pii

PPATHOGENS-D-12-00350

journal_volume

8

pub_type

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