Foamy viruses are retroviruses of the spumavirus family that are often isolated from primary cultures of primate cells. We previously constructed vectors based on human foamy virus (HFV) and found that they were able to transduce a wide variety of vertebrate cells by integration of the vector genome. Here we show that several types of hematopoietic cells are efficiently transduced by an HFV vector that encodes alkaline phosphatase (AP). These cell types include transformed cell lines and primary hematopoietic progenitors from mice, baboons, and humans. The transduction rates of HFV vectors compare favorably with those obtained by murine leukemia virus vectors, which suggests that HFV vectors may be effective in the treatment of hematologic diseases by gene therapy.

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