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The DNA polymerase gene of African swine fever virus (ASFV) was mapped by marker rescue experiments using a phosphonoacetic acid-resistant mutant and hybridization with an oligonucleotide probe designed from the most conserved motif of family B DNA polymerases. Viral DNA fragments mapping in this region were cloned and sequenced. An open reading frame coding for a 1244 amino acid long peptide with a molecular mass of 142.5 kDa was determined from the sequence. A unique feature of ASFV DNA polymerase is the presence of 13 tandem repeats of the sequence Ala-Gly-Asp-Pro near the carboxyl end of the molecule. Comparison with 30 sequences of alpha-like DNA polymerases of cellular and viral origin showed that ASFV DNA polymerase has all the conserved motifs of family B DNA polymerases. A 3.9 kb transcript was detected by Northern hybridization and the transcription initiation and termination sites were mapped by S1 analysis and primer extension. Late transcription was initiated at a site different from the early transcription initiation site. A 145 kDa protein, consistent with the size of the gene, was identified by an in situ enzyme assay after gel electrophoresis of infected cell extracts.

Genetic identification and nucleotide sequence of the DNA polymerase gene of African swine fever virus