Comparative genomic analyses of a virulent pseudorabies virus and a series of its in vitro passaged strains.

Abstract:

BACKGROUND:Pseudorabies virus (PRV) of the family Herpesviridae is the causative agent of Aujeszky's disease. Attenuation of PRV by serial passaging in vitro is a well-established method; however, the dynamic variations occurring on viral genome during this process have not been characterized. METHODS:Genome sequencing and comparative genomic analyses of a virulent pseudorabies virus and a series of its plaque-purified strains via serial passaging in vitro were performed, and the properties in vitro and in vivo of which were further characterized. RESULTS:Compared to the parental virus, replication in vitro was enhanced in the highly passaged F50, F91, and F120. In contrast, lethality in mice decreased gradually with passage number. Genome sequencing of F50, F91, and F120 showed deletion of a large fragment containing gE, which is likely related to their attenuation. In addition, single nucleotide variations were identified in many genes of F50, F91, and F120. In-frame and frameshift indels were also detected in specific genes of passaged strains. Particularly frameshift mutations were observed in highly passaged strains, resulting in a truncated but overexpressed pUL46. CONCLUSION:During attenuation of PRV by serial passaging in Vero cells, dynamic variation patterns including a large deletion, single nucleotide variations, small in-frame indels, and also frameshifts mutations successively emerged, contributing to evolution of the viral population and enabling the gradual attenuation of the virus. These data provide clues to better understand PRV attenuation during passaging.

journal_name

Virol J

journal_title

Virology journal

authors

Ye C,Wu J,Tong W,Shan T,Cheng X,Xu J,Liang C,Zheng H,Li G,Tong G

doi

10.1186/s12985-018-1102-8

subject

Has Abstract

pub_date

2018-12-29 00:00:00

pages

195

issue

1

issn

1743-422X

pii

10.1186/s12985-018-1102-8

journal_volume

15

pub_type

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