Progress toward an enhanced vaccine: Eight marked attenuated viruses to porcine reproductive and respiratory disease virus.

Autor: Spear A; Virus and Prion Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA, USA. Electronic address: Allyn.Spear@elanco.com., Wang FX; Virus and Prion Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA, USA. Electronic address: wangfx_vet@163.com., Kappes MA; Virus and Prion Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA, USA. Electronic address: kappes_matthew@bah.com., Das PB; Virus and Prion Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA, USA. Electronic address: phanidas1@yahoo.com., Faaberg KS; Virus and Prion Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA, USA. Electronic address: kay.faaberg@ars.usda.gov.
Jazyk: angličtina
Zdroj: Virology [Virology] 2018 Mar; Vol. 516, pp. 30-37. Date of Electronic Publication: 2018 Jan 08.
DOI: 10.1016/j.virol.2017.12.029
Abstrakt: Recombinant viruses of strain Ingelvac® PRRS porcine reproductive and respiratory syndrome virus (PRRSV) modified live virus vaccine were produced with two individual small in-frame deletions in nonstructural protein 2 (nsp2; Δ23 and Δ87) and also the same deletions supplanted with foreign tags (Δ23-V5, Δ23-FLAG, Δ23-S, Δ87-V5, Δ87-FLAG, Δ87-S). The viruses, but one (Δ87-FLAG), were stable for 10 passages and showed minimal effects on in vitro growth. Northern hybridization showed that the Δ23-tagged probe detected intracellular viral genome RNA as well as shorter RNAs that may represent heteroclite species, while the Δ87-tagged probe detected predominantly only genome length RNAs. When the tagged viruses were used to probe nsp2 protein in infected cells, perinuclear localization similar to native nsp2 was seen. Dual infection of Δ23-S and Δ87-S viruses allowed some discrimination of individual tagged nsp2 protein, facilitating future research. The mutants could potentially also be used to differentiate infected from vaccinated animals.
(Published by Elsevier Inc.)
Databáze: MEDLINE
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