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- W1801420105 abstract "Cell lines were established which produced high titers (approximately 10(6) infectious units per ml) of amphotropic, replication-defective recombinant retroviruses which transduced sequences encoding either human purine nucleoside phosphorylase (PNP) or adenosine deaminase (ADA). These viruses also contained a human hypoxanthine phosphoribosyltransferase gene as a selectable marker and a mouse metallothionein promoter (MMP) sequence just upstream from the PNP or ADA genes. Virus structure was maintained through the replication cycle if a short (216-base pair) MMP sequence was used. However, the use of a longer (1,834-base pair) MMP sequence resulted in the deletion of a significant portion of the recombinant virus genome, including the transcriptional regulatory elements of the MMP sequence. Northern analysis indicated a predominance of genome length transcripts in cells infected with deleted virus. The demonstration of substantial human PNP or ADA activity in virus-infected mouse fibroblasts by isozyme analysis suggested that active gene product was translated from either spliced or bicistronic message. The deleted ADA and PNP viruses were introduced into mouse hematopoietic stem cells by cocultivating freshly explanted bone marrow with virus producer cells. The infected marrow cells were injected into irradiated, syngeneic recipient mice, and the presence of integrated ADA or PNP proviral sequences was demonstrated in the DNA of spleen colonies by Southern analysis. Failure of these integrated proviral sequences to express active, human isozyme in spleen colony tissue indicated the existence of some regulatory constraint not active in cultured mouse cells." @default.
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- W1801420105 date "1987-02-01" @default.
- W1801420105 modified "2023-09-28" @default.
- W1801420105 title "Human purine nucleoside phosphorylase and adenosine deaminase: gene transfer into cultured cells and murine hematopoietic stem cells by using recombinant amphotropic retroviruses." @default.
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- W1801420105 doi "https://doi.org/10.1128/mcb.7.2.838" @default.
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