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    Bombyx mori cypovirus (BmCPV), a member of the family Reoviridae, is a model of Cypovirus, has a 10 segmented double-stranded RNA genome. However, so far, only one viral small peptide vSP27 with negative regulation on viral infection was identified; the mechanisms underlying host-BmCPV interaction are still unknown. Here, we identified that vSP27 was translated from a BmCPV derived circular RNA (circRNA-vSP27). Subsequently, results showed that vSP27 induced generation of ROS activated the NF-κB signaling pathway, induced the expression of antimicrobial peptides, and suppressed BmCPV infection. On the other hand, we identified a nuclear protein Akirin that could hijack vSP27, positively regulate the NF-κB pathway, and lead to inhibiting the viral infection. Altogether, our data suggested that BmCPV derived circRNA-vSP27 with small peptide translation activity may be employed by the host immunity in defense against the BmCPV infection. Copyright © 2021 Elsevier B.V. All rights reserved.


    Yunshan Zhang, Xing Zhang, Kun Dai, Min Zhu, Zi Liang, Jun Pan, Ziyao Zhang, Renyu Xue, Guangli Cao, Xiaolong Hu, Chengliang Gong. Bombyx mori Akirin hijacks a viral peptide vSP27 encoded by BmCPV circRNA and activates the ROS-NF-κB pathway against viral infection. International journal of biological macromolecules. 2022 Jan 01;194:223-232

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    PMID: 34875309

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