We identified and determined the nucleotide sequence of Marek's disease virus serotype 2 (MDV2) UL25, UL26 and UL26.5 homologous genes of herpes simplex virus type 1 (HSV-1). The UL25, UL26 and UL26.5 genes of HSV-1 encode virion proteins (UL25 and UL26.5) and serine protease (UL26). The deduced amino acid sequences of the three proteins show a high degree of homology to counterparts of HSV-1. By northern blot analyses we found that four transcripts whose sizes arc 4.9, 3.9, 2.0 and 1.3 kb are transcribed from the domains of MDV2 genome containing the three genes. This is the first report dealing with UL25, UL26 and UL26.5 homologues of HSV-1 in MDV serotypes.
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