Retrovirus-mediated gene transfer of human adenosine deaminase: expression of functional enzyme in murine hematopoietic stem cells in vivo.
Simplified Moloney murine leukemia virus-based recombinant retrovirus vectors have been constructed which transduce human adenosine deaminase (ADA) cDNA. ADA transcription is under the control of the constitutive promoter for the human X chromosome phosphoglycerate kinase (pgk) gene. In these simplified vectors, dominant selectable markers are not included and selection is dependent on overproduction of functional ADA enzyme. Primary murine hematopoietic cells were infected with helper-free recombinant ADA virus generated from Psi-2 packaging cells. Protein analysis revealed that human ADA enzyme was expressed in progenitor-derived hematopoietic colonies in vitro and CFU-S-derived spleen colonies in vivo. Enzyme expression was dependent on transcription from the pgk promoter. ADA expression in primary murine hematopoietic cells directed by the internal promoter was not adversely affected by the presence of the Moloney virus long terminal repeat enhancer sequence. Use of these vectors allows systematic evaluation of the effects of specific sequences in recombinant retrovirus vectors on expression in primary murine hematopoietic cells in vivo.
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