title: Comparison of pseudorabies virus China reference strain with emerging variants reveals independent virus evolution within specific geographic regions.
abstract: Pseudorabies virus (PRV) China reference strain Ea is genetically closely related to newly emerged variants; however, there is limited information about PRV Ea. Here, we compared PRV Ea with new variant strains by growth kinetics, genome sequencing, and protein expression analysis. Growth analysis showed that strain Ea forms smaller plaques than strain HNX. The full-length genome sequence of Ea revealed that it is clustered in the same subgroup as HNX. Ea and HNX strains exhibited similar extracellular virion protein polymorphisms, whereas strain Bartha expressed less VP26 and more GAPDH. In infected cells, strain Ea expressed high levels of IE180 protein, and Ea and HNX produced higher levels of UL21 protein than strain Bartha. These findings provide evidence that PRV China reference strain Ea is genetically closely related to the newly emerged variant strains, indicating that strain PRV China may have evolved independently leading to the emergence of a variant strain.
authors.affiliation: State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Chang-Xian
authors.initials: CX
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Xian-Rong
authors.initials: XR
authors.lastname: Song
authors.affiliation: State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Huan-Chun
authors.initials: HC
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: lzf6789@mail.hzau.edu.cn.
authors.forename: Zheng-Fei
authors.initials: ZF
authors.lastname: Liu
mesh_terms: D000818:Animals; D001483:Base Sequence; D002681:China; D019143:Evolution, Molecular; D011558:Herpesvirus 1, Suid / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification* / Q000378:metabolism; D010802:Phylogeny; D011557:Pseudorabies / Q000821:virology*; D013552:Swine; D013553:Swine Diseases / Q000821:virology*
keywords: Pseudorabies virus; Reference strain; Variant strain