A 205-nucleotide Deletion in the 3' Untranslated Region of Avian Leukosis Virus Subgroup J, Currently Emergent in China, Contributes to Its Pathogenicity

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 2012 Sep 21

PMID 22993155

Citations 24

Authors

Qi Wang

Yulong Gao

Yongqiang Wang

Liting Qin

Xiaole Qi

Yue Qu

Honglei Gao

Xiaomei Wang

Affiliations

Soon will be listed here.

Abstract

In the past 5 years, an atypical clinical outbreak of avian leukosis virus subgroup J (ALV-J), which contains a unique 205-nucleotide deletion in its 3' untranslated region (3'UTR), has become epidemic in chickens in China. To determine the role of the 205-nucleotide deletion in the pathogenicity of ALV-J, a pair of viruses were constructed and rescued. The first virus was an ALV-J Chinese isolate (designated HLJ09SH01) containing the 205-nucleotide deletion in its 3'UTR. The second virus was a chimeric clone in which the 3'UTR contains a 205-nucleotide sequence corresponding to a region of the ALV-J prototype virus. The replication and pathogenicity of the rescued viruses (rHLJ09SH01 and rHLJ09SH01A205) were investigated. Compared to rHLJ09SH01A205, rHLJ09SH01 showed a moderate growth advantage in vitro and in vivo, in addition to exhibiting a higher oncogenicity rate and lethality rate in layers and broilers. Increased vascular endothelial growth factor A (VEGF-A) and vascular endothelial growth receptor subtype 2 (VEGFR-2) expression was induced by rHLJ09SH01 more so than by rHLJ09SH01A205 during early embryonic vascular development, but this increased expression disappeared when the expression levels were normalized to the viral levels. This finding suggests that the expression of VEGF-A and VEGFR-2 is associated with viral replication and may also represent a novel molecular mechanism underlying the oncogenic potential of ALV-J. Overall, our findings not only indicate that the unique 205-nucleotide deletion in the ALV-J genome occurred naturally in China and contributes to increased pathogenicity but also point to the possible mechanism of ALV-J-induced oncogenicity.

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