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Analysis of a type D retroviral capsid gene expressed in ovine pulmonary carcinoma and present in both affected and unaffected sheep genomes.

Abstract：

:Ovine pulmonary carcinoma is a contagious neoplastic disease of sheep which can be transmitted experimentally with cell-free filtrate. Products homologous to structural proteins of type D and type B retroviruses are expressed in the tumors, but an infectious retrovirus has yet to be isolated. Retroviral RNA was isolated from an affected Peruvian sheep and used as a substrate for reverse transcription. The DNA obtained was subjected to polymerase chain reaction amplification using degenerate primers designed to amino acid sequences shared by the capsid peptides of the viruses that cross-react with the proteins found in the tumor tissues. A retroviral capsid region of type D lineage was isolated that proved to be highly homologous to the jaagsiekte sheep retrovirus isolated from affected sheep in South Africa. This capsid sequence was used to detect the virus in the genomes of sheep with and without ovine pulmonary carcinoma. More than 20 endogenous sequences that hybridized with the probe were found in the sheep examined, and assortment of these could be followed in sheep families. Initial experiments did not show any obvious differences in viral presence in the tumors compared with the background of endogenous viral sequences in unaffected lungs.

journal_name

Virology

journal_title

Virology

authors

Hecht SJ,Carlson JO,DeMartin JC

doi

10.1006/viro.1994.1366

subject

Has Abstract

pub_date

1994-07-01 00:00:00

pages

480-4

issue

1

eissn

0042-6822

issn

1096-0341

pii

S0042682284713663

journal_volume

202

pub_type

杂志文章

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