Pathogenesis of mucosal disease: a cytopathogenic pestivirus generated by an internal deletion.
Cytopathogenic bovine viral diarrhea virus (BVDV) arises by RNA recombination in animals persistently infected with noncytopathogenic BVDV. Such animals develop fatal mucosal disease. In this report, the genome of a cytopathogenic BVDV isolate, termed CP9, is characterized. CP9-infected cells contained not only viral genomic RNA of 12.3 kb but also a BVDV-specific RNA of 8 kb. cDNA cloning and sequencing revealed that the 8-kb RNA is a BVDV genome with an internal deletion of 4.3 kb. The 8-kb RNA represents the genome of a typical defective interfering particle (DI), since its replication was strictly dependent on the presence of a helper virus and strongly interfered with the replication of the helper. Cell culture experiments demonstrated that the CP9 virus stock contains two viruses, namely, a helper virus and DI9. While the helper virus alone was noncytopathogenic, the presence of the DI conferred cytopathogenicity. Expression experiments demonstrated that p80, the marker protein of cytopathogenic BVDV, is translated from the defective genome. The occurrence of this cytopathogenic DI is linked to a fatal disease in cattle.
Tautz
N
N
Federal Research Centre for Virus Diseases of Animals, Tübingen, Germany.
Thiel
H J
HJ
Dubovi
E J
EJ
Meyers
G
G
D000595:Amino Acid Sequence; D000818:Animals; D015152:Blotting, Northern; D001912:Bovine Virus Diarrhea-Mucosal Disease / Q000382:microbiology*; D002417:Cattle; D003588:Cytopathogenic Effect, Viral; D003673:Defective Viruses / Q000235:genetics*; D001908:Diarrhea Viruses, Bovine Viral / Q000235:genetics*; D008969:Molecular Sequence Data; D010447:Peptide Hydrolases; D010576:Pestivirus / Q000145:classification / Q000235:genetics*; D020365:RNA Helicases; D012367:RNA, Viral / Q000235:genetics*; D017384:Sequence Deletion; D017386:Sequence Homology, Amino Acid; D017361:Viral Nonstructural Proteins / Q000096:biosynthesis; D014764:Viral Proteins / Q000378:metabolism; D012697:Serine Endopeptidases; D043583:Nucleoside-Triphosphatase; D053487:DEAD-box RNA Helicases; D000085242:Viral Proteases
D010447:Peptide Hydrolases; D020365:RNA Helicases; D012367:RNA, Viral; D017361:Viral Nonstructural Proteins; D014764:Viral Proteins; C074956:p125 protein, bovine diarrhea virus; C086730:p80 protein, bovine viral diarrhea virus; D012697:Serine Endopeptidases; D043583:Nucleoside-Triphosphatase; D053487:DEAD-box RNA Helicases; D000085242:Viral Proteases