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. 1994 Jan 25;22(2):208–213. doi: 10.1093/nar/22.2.208

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

A Martins 1, G Ribeiro 1, M I Marques 1, J V Costa 1
PMCID: PMC307773  PMID: 8121806

Abstract

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.

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Selected References

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