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A group of cross-hybridizing DNA segments contained within the restriction fragments RK', RL, RJ, and RD' of African swine fever virus DNA were mapped and sequenced. Analysis of these sequences revealed the presence of a family of homologous open reading frames in regions close to the DNA ends. The whole family is composed of six open reading frames with an average length of 360 coding triplets (multigene family 360), four of which are located in the left part of the genome and two of which are in the right terminal EcoRI fragment. In close proximity to the right terminal inverted repeat, we found an additional small open reading frame which was homologous to the 5'-terminal portion of the other open reading frames, suggesting that most of that open reading frame has been deleted. These repeated sequences account for the previously described inverted internal repetitions (J.M. Sogo, J.M. Almendral, A. Talavera, and E. Viñuela, Virology 133:271-275, 1984). Most of the genes of multigene family 360 are transcribed in African swine fever virus-infected cells. A comparison of the predicted protein sequences of family 360 indicated that several residues are conserved, suggesting that an overall structure is maintained for every member of the family. The transcription direction of each open reading frame, as well as the evolutionary relationships among the genes, suggests that the family originated by gene duplication and translocation of sequences between the DNA ends.

Multigene families in African swine fever virus: family 360