Nucleotide sequence of classical swine fever virus strain Alfort/187 and transcription of infectious RNA from stably cloned full-length cDNA.

Abstract:

:The complete nucleotide sequence of the genome of classical swine fever virus (CSFV) strain Alfort/187 was determined from three cDNA libraries constructed by cloning of DNA fragments obtained from independent sets of reverse transcription and PCR. The cDNA fragments were then assembled and inserted downstream of a T7 promoter in a P15A-derived plasmid vector to obtain the full-length cDNA clone pA187-1. The first nucleotide of the CSFV genome was positioned at the transcription start site of the T7 promoter. Cleavage at an SrfI restriction site introduced at the exact 3' end of the cloned viral cDNA allowed the in vitro synthesis of full-length viral RNA by runoff transcription. This RNA proved to be infectious after transfection into porcine kidney cells. Infectivity was not increased after capping of the synthetic RNA. Virus recovered from transfected cells was titrated in porcine kidney cells by endpoint dilution using indirect immunofluorescence and a CSFV-specific monoclonal antibody. RNA transcripts generated from plasmid DNA isolated from bacteria which had been cultured and cloned 10 times remained infectious, indicating that the full-length clone is stable in bacterial cells. A silent point mutation introduced at position 11842 of the genome was retained in the recombinant virus recovered from transfected cells. An infectious chimeric construct was obtained by replacing a 696-bp fragment in pA187-1 with the corresponding cDNA fragment from the CSFV strain CAP. The stably cloned full-length CSFV cDNA allows site-specific mutagenesis of the viral genome and thus will be useful for detailed molecular characterization of the virus as well as for studies of viral pathogenesis.

journal_name

J Virol

journal_title

Journal of virology

authors

Ruggli N,Tratschin JD,Mittelholzer C,Hofmann MA

doi

10.1128/JVI.70.6.3478-3487.1996

subject

Has Abstract

pub_date

1996-06-01 00:00:00

pages

3478-87

issue

6

eissn

0022-538X

issn

1098-5514

journal_volume

70

pub_type

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