TY - JOUR
T1 - A vaccinia virus MVA-T7-mediated recovery of infectious hepatitis A virus from full-size cDNA or from two cDNAs, both by themselves unable to complete the virus life cycle
AU - Kusov, Yuri Y.
AU - Shatirishvili, Gocha
AU - Klinger, Matthias
AU - Gauss-Müller, Verena
N1 - Funding Information:
The recombinant VV MVA-T7 was kindly provided by S. Leyrer. We thank M. Beard for providing Huh-T7 cells, A. Dotzauer for HAV anti-VP1 serum and M. Jecht for pT7*-18f. This work was supported by the Deutsche Forschungsgemeinschaft, SFB 367 project B7.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2002/10/1
Y1 - 2002/10/1
N2 - The replication-deficient vaccinia virus (VV) MVA-T7 produces large amounts of T7 RNA polymerase and permits efficient protein expression from cDNA of T7-promoted genes. Yet, unlike recombinant VV vTF7-3, (VV) MVA-T7 produces no cytopathic effect in primate cells, thus allowing the study of processes with slow kinetics. We have applied MVA-T7 to aid genome expression of HAV, a representative of the Picornaviridae family that is well known for its inefficient replication in mammalian cell cultures. After cDNA transfection and MVA-T7 infection, empty capsids and mature HAV particles were formed with different kinetics and were characterized by their morphology, protein content, and infectivity. The data suggests that HAV genome replication is initiated from RNA, which was transcribed in vivo by the MVA-T7-encoded T7 RNA polymerase. HAV genome replication was also demonstrated in a recombination assay. After co-expression of two subgenomic HAV cDNAs, both by themselves unable to complete the viral life cycle, infectious HAV was rescued, indicating that replication-dependent genetic recombination has occurred. We propose that the high-level genome expression mediated in vivo by the VV-encoded T7 RNA polymerase augments the amount of viral RNA, such that replication of viruses poorly replicating in cell cytoplasm is detectable.
AB - The replication-deficient vaccinia virus (VV) MVA-T7 produces large amounts of T7 RNA polymerase and permits efficient protein expression from cDNA of T7-promoted genes. Yet, unlike recombinant VV vTF7-3, (VV) MVA-T7 produces no cytopathic effect in primate cells, thus allowing the study of processes with slow kinetics. We have applied MVA-T7 to aid genome expression of HAV, a representative of the Picornaviridae family that is well known for its inefficient replication in mammalian cell cultures. After cDNA transfection and MVA-T7 infection, empty capsids and mature HAV particles were formed with different kinetics and were characterized by their morphology, protein content, and infectivity. The data suggests that HAV genome replication is initiated from RNA, which was transcribed in vivo by the MVA-T7-encoded T7 RNA polymerase. HAV genome replication was also demonstrated in a recombination assay. After co-expression of two subgenomic HAV cDNAs, both by themselves unable to complete the viral life cycle, infectious HAV was rescued, indicating that replication-dependent genetic recombination has occurred. We propose that the high-level genome expression mediated in vivo by the VV-encoded T7 RNA polymerase augments the amount of viral RNA, such that replication of viruses poorly replicating in cell cytoplasm is detectable.
UR - http://www.scopus.com/inward/record.url?scp=0036802209&partnerID=8YFLogxK
U2 - 10.1016/S0168-1702(02)00115-6
DO - 10.1016/S0168-1702(02)00115-6
M3 - Journal articles
C2 - 12367752
AN - SCOPUS:0036802209
SN - 0168-1702
VL - 89
SP - 75
EP - 88
JO - Virus Research
JF - Virus Research
IS - 1
ER -
