1887

Abstract

Previous research revealed the induction of chicken () in the lungs of chickens infected with highly pathogenic avian influenza viruses (HPAIVs). This activity was correlated with the degree of pathogenicity of the viruses to chickens. As mammalian ubiquitin-specific protease (USP18) is known to remove type I interferon (IFN I)-inducible ubiquitin-like molecules from conjugated proteins and block IFN I signalling, we explored the function of the chicken homologue of USP18 during avian influenza virus infection. With this aim, we cloned from cultured chicken cells and revealed that the putative ORF comprises 1137 bp. Comparative analysis of the predicted aa sequence of chUSP18 with those of human and mouse USP18 revealed relatively high sequence similarity among the sequences, including domains specific for the ubiquitin-specific processing protease family. Furthermore, we found that chUSP18 expression was induced by chicken IFN I, as observed for mammalian USP18. Experiments based on over-expression and depletion demonstrated that chUSP18 significantly enhanced the replication of a low-pathogenic avian influenza virus (LPAIV), but not an HPAIV. Our findings suggest that chUSP18, being similar to mammalian USP18, acts as a pro-viral factor during LPAIV replication .

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2017-09-01
2024-12-05
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