A lethal DENV-2 wild-type mouse model for mutagenesis investigations
2025
Zhiran Qin | Xiaoting Xie | Hua Ye | Hao Wu | Zhuoyun Li | Jingshu Li | Xiaoen He | Zuxin Liang | Xuling Liu | Li Zhu | Qinghua Wu | Weiwei Xiao | Kefeng Wu | Chengsong Wan | Bao Zhang | Zhaohui Sun | Jianhai Yu | Chenguang Shen | Linzhong Yu | Wei Zhao
Abstract Background Effective mouse models for testing antiviral medications should be both cost-effective and require minimal labor. Immunodeficient mouse models, such as AG129, are commonly used in dengue virus (DENV) research; however, their high import and maintenance costs make them relatively expensive. Moreover, the absence of IFN-γ signaling limits the capacity of the AG129 model. To date, wild-type mouse models of DENV infection have only exhibited mild symptoms without lethality, limiting their research applicability. In this study, we developed a lethal C57BL/6 wild-type mouse model infected with DENV-2 365 strain. By blocking the type I interferon receptor before the virus challenge, we allowed the immune response to be restored at a later stage of infection. Results Following infection, the mice exhibited severe symptoms, including weight loss, high viremia levels, elevated inflammatory cytokines, significant vascular leakage, and pathological changes in the brain, kidney, liver and spleen. The model also displayed severe central nervous symptoms and 100% mortality. Additionally, we used this model to evaluate an adaptable NS2A protein mutation found in both Zika virus and DENV-2. Conclusions Our study introduces an alternative model design for investigating viral mutations, providing a valuable tool for future research.
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