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It has been reported that loss of the tumorigenic potential of attenuated Marek's disease virus (MDV) is strongly associated with amplification of the 132-bp repeat sequences found within the BamHI-D and BamHI-H fragments contained within the long terminal repeat and the long internal repeat, respectively. The expansion of this region results in loss of transcripts that are 3.8, 3.0, and 1.8 kbp long that are produced by tumorigenic strains of MDV. This evidence suggests that production of one or more of these three RNAs is strongly associated with the tumorigenic potential of the virus. In this study, we have cloned and sequenced 1.69-, 1.5-, 1.9-, and 2.2-kbp cDNAs from the BamHI-H gene family RNAs associated with tumorigenicity. The 1.69- and 2.2-kbp cDNAs are derived from nonspliced transcripts, whereas the 1.5- and 1.9-kbp cDNAs are from single spliced mRNAs spanning the BamHI-H and BamHI-I2 fragments of MDV DNA. Sequence analysis has shown two potential open reading frames in each of the cDNAs. The putative 63-amino-acid protein encoded by the first open reading frame in the 1.69-kbp cDNA and a putative 75-amino-acid protein encoded by the first open reading frame in the 1.5-kbp cDNA showed limited homology with the mouse T-cell lymphoma oncogene and the fes/fps family of kinase-related transforming proteins.

Isolation and characterization of cDNAs from BamHI-H gene family RNAs associated with the tumorigenicity of Marek's disease virus