Knockout of the WD40 domain of ATG16L1 enhances foot and mouth disease virus replication
Xiuping Wu,
Yang Yang,
Yi Ru,
Rongzeng Hao,
Dongmei Zhao,
Ruifang Ren,
Bingzhou Lu,
Yajun Li,
Shengzhen Sun,
Haixue Zheng,
Wenhui Wang
Affiliations
Xiuping Wu
College of Veterinary Medicine, Gansu Agricultural University
Yang Yang
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Lanzhou University, Chinese Academy of Agricultural Sciences
Yi Ru
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Lanzhou University, Chinese Academy of Agricultural Sciences
Rongzeng Hao
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Lanzhou University, Chinese Academy of Agricultural Sciences
Dongmei Zhao
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Lanzhou University, Chinese Academy of Agricultural Sciences
Ruifang Ren
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Lanzhou University, Chinese Academy of Agricultural Sciences
Bingzhou Lu
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Lanzhou University, Chinese Academy of Agricultural Sciences
Yajun Li
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Lanzhou University, Chinese Academy of Agricultural Sciences
Shengzhen Sun
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Lanzhou University, Chinese Academy of Agricultural Sciences
Haixue Zheng
State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou Veterinary Research Institute, Lanzhou University, Chinese Academy of Agricultural Sciences
Wenhui Wang
College of Veterinary Medicine, Gansu Agricultural University
Abstract The WD40 domain is one of the most abundant domains and is among the top interacting domains in eukaryotic genomes. The WD40 domain of ATG16L1 is essential for LC3 recruitment to endolysosomal membranes during non-canonical autophagy, but dispensable for canonical autophagy. Canonical autophagy was utilized by FMDV, while the relationship between FMDV and non-canonical autophagy is still elusive. In the present study, WD40 knockout (KO) PK15 cells were successfully generated via CRISPR/cas9 technology as a tool for studying the effect of non-canonical autophagy on FMDV replication. The results of growth curve analysis, morphological observation and karyotype analysis showed that the WD40 knockout cell line was stable in terms of growth and morphological characteristics. After infection with FMDV, the expression of viral protein, viral titers, and the number of copies of viral RNA in the WD40-KO cells were significantly greater than those in the wild-type PK15 cells. Moreover, RNA‒seq technology was used to sequence WD40-KO cells and wild-type cells infected or uninfected with FMDV. Differentially expressed factors such as Mx1, RSAD2, IFIT1, IRF9, IFITM3, GBP1, CXCL8, CCL5, TNFRSF17 were significantly enriched in the autophagy, NOD-like receptor signaling pathway, RIG-I-like receptor signaling pathway, Toll-like receptor signaling pathway, cytokine-cytokine receptor interaction and TNF signaling pathway, etc. The expression levels of differentially expressed genes were detected via qRT‒PCR, which was consistent with the RNA‒seq data. Here, we experimentally demonstrate for the first time that knockout of the WD40 domain of ATG16L1 enhances FMDV replication by downregulation innate immune factors. In addition, this result also indicates non-canonical autophagy inhibits FMDV replication. In total, our results play an essential role in regulating the replication level of FMDV and providing new insights into virus–host interactions and potential antiviral strategies.
