Abstract
Infection of rats with Friend murine leukemia virus (Fr-MLV) clone A8 causes thymoma in all the animals within 7 weeks. The rapid induction of thymoma is associated with a unique enhancer structure in the U3 region of the A8-LTR. Our Southern blot analyses showed that the thymomas were oligo clonal. The A8-induced thymomas showed 3-to 11-fold overexpression of c-myc mRNA. These results suggest that provirus insertion into particular positions of the host genome is correlated with tumorigenesis after A8 infection and that up-regulation of c-myc plays an important role in the induction of thymoma.
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