Copy number variation and differential expression of a protective endogenous retrovirus in sheep.
The Jaagsiekte sheep retrovirus exJSRV and its endogenous counterpart enJSRV co-exist in sheep. exJSRV, a betaretrovirus, is the etiological agent of ovine pulmonary adenocarcinoma, and it has been demonstrated in vitro that an enJSRV Gag variant bearing the R-to-W amino acid change at position 21 was able to block exJSRV budding from the cells, providing a potential protective role for the host. In this work, we developed a fast mutation detection assay based on the oligo ligation assay (OLA) that permits the quantification of the relative proportions of the R21 and W21 Gag variants present in individual genomes and in cDNA obtained from normal and exJSRV-induced lung tumors. We have shown that the W21/R21 ratio is variable within and between breeds. We also describe for the first time that putative protecting enJSRV variants were expressed in alveolar type II cells (AECII), the major target of exJSRV.
UMR754 Rétrovirus et Pathologie Comparée INRA, Université Lyon 1, Université de Lyon, Lyon, France.
Barbara
B
Viginier
Christine
C
Dolmazon
Isabelle
I
Lantier
Frédéric
F
Lantier
Fabienne
F
Archer
Caroline
C
Leroux
Christophe
C
Terzian
D000818:Animals; D001483:Base Sequence; D056915:DNA Copy Number Variations / Q000235:genetics*; D004273:DNA, Neoplasm / Q000302:isolation & purification; D020077:Endogenous Retroviruses / Q000235:genetics*; D015967:Gene Expression Regulation, Viral; D015683:Gene Products, gag / Q000235:genetics; D016678:Genome / Q000235:genetics; D007178:Inbreeding; D022141:Jaagsiekte sheep retrovirus / Q000235:genetics; D008168:Lung / Q000473:pathology / Q000821:virology; D008969:Molecular Sequence Data; D050505:Mutant Proteins / Q000235:genetics; D009154:Mutation / Q000235:genetics; D011533:Proviruses / Q000235:genetics; D011648:Pulmonary Adenomatosis, Ovine / Q000473:pathology / Q000821:virology; D012334:RNA, Neoplasm / Q000302:isolation & purification; D015203:Reproducibility of Results; D012756:Sheep / Q000821:virology*
D004273:DNA, Neoplasm; D015683:Gene Products, gag; D050505:Mutant Proteins; D012334:RNA, Neoplasm