Murine norovirus virulence factor 1 (VF1) protein contributes to viral fitness during persistent infection.
Murine norovirus virulence factor 1 (VF1) protein contributes to viral fitness during persistent infection.
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鼠诺如病毒毒力因子1(VF 1)蛋白有助于持续感染期间的病毒适应性。
DOI:
10.1099/jgv.0.001651
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发表时间:
2021-09
期刊:
影响因子:
--
通讯作者:
Goodfellow IG
中科院分区:
文献类型:
--
作者:
Borg C;Jahun AS;Thorne L;Sorgeloos F;Bailey D;Goodfellow IG
Murine norovirus (MNV) is widely used as a model for studying norovirus biology. While MNV isolates vary in their pathogenesis, infection of immunocompetent mice mostly results in persistent infection. The ability of a virus to establish a persistent infection is dependent on its ability to subvert or avoid the host immune response. Previously, we described the identification and characterization of virulence factor 1 (VF1) in MNV, and demonstrated its role as an innate immune antagonist. Here, we explore the role of VF1 during persistent MNV infection in an immunocompetent host. Using reverse genetics, we generated MNV-3 viruses carrying a single or a triple termination codon inserted in the VF1 ORF. VF1-deleted MNV-3 replicated to comparable levels to the wildtype virus in tissue culture. Comparative studies between MNV-3 and an acute MNV-1 strain show that MNV-3 VF1 exerts the same functions as MNV-1 VF1, but with reduced potency. C57BL/6 mice infected with VF1-deleted MNV-3 showed significantly reduced replication kinetics during the acute phase of the infection, but viral loads rapidly reached the levels seen in mice infected with wildtype virus after phenotypic restoration of VF1 expression. Infection with an MNV-3 mutant that had three termination codons inserted into VF1, in which reversion was suppressed, resulted in consistently lower replication throughout a 3 month persistent infection in mice, suggesting a role for VF1 in viral fitness in vivo. Our results indicate that VF1 expressed by a persistent strain of MNV also functions to antagonize the innate response to infection. We found that VF1 is not essential for viral persistence, but instead contributes to viral fitness in mice. These data fit with the hypothesis that noroviruses utilize multiple mechanisms to avoid and/or control the host response to infection and that VF1 is just one component of this.
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影响因子:
7.7
作者:
Arias A;Thorne L;Goodfellow I
通讯作者:
Goodfellow I
影响因子:
30.3
作者:
Lee S;Wilen CB;Orvedahl A;McCune BT;Kim KW;Orchard RC;Peterson ST;Nice TJ;Baldridge MT;Virgin HW
通讯作者:
Virgin HW
影响因子:
56.9
作者:
Karst, SM;Wobus, CE;Virgin, HW
通讯作者:
Virgin, HW
影响因子:
15.9
作者:
Nice TJ;Robinson BA;Van Winkle JA
通讯作者:
Van Winkle JA
DOI:
10.1074/jbc.m115.688234
发表时间:
2015-11-13
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Emmott E;Sweeney TR;Goodfellow I
通讯作者:
Goodfellow I