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The complete genome of the jaagsiekte sheep retrovirus (JSRV), the suspected etiological agent of ovine pulmonary carcinoma, has been cloned from viral particles secreted in lung exudates of affected animals and sequenced. The genome is 7,462 nucleotides long and exhibits a genetic organization characteristic of the type B and D oncoviruses. Comparison of the amino acid sequences of JSRV proteins with those of other retrovirus proteins and phylogenetic studies suggest that JSRV diverged from its type B and D lineage after the type B mouse mammary tumor virus but before the type D oncoviruses captured the env gene of a reticuloendotheliosislike virus. Southern blot studies show that closely related sequences are present in sheep and goat normal genomic DNA, indicating that JSRV could be endogenous in ovine and caprine species.

Nucleotide sequence of the jaagsiekte retrovirus, an exogenous and endogenous type D and B retrovirus of sheep and goats