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Reverse transcription of retroviral genomic RNA in a target cell is influenced by cellular factors, including the concentration of deoxyribonucleoside triphosphates (dNTPs). In addition, recent data have demonstrated that reverse transcription can be driven within human immunodeficiency virus type 1 virions, prior to infection of a cell, by increasing extracellular concentrations of dNTPs. In attempts to increase the transduction efficiency of recombinant murine leukemia virus vectors, endogenous reverse transcription was initiated within cell-free, recombinant murine leukemia virus virions in the presence of relatively high concentrations of dNTPs. As a result, the expression of transduced genes via these retroviral vectors was increased approximately 10-fold by treatment of virions with dNTPs. Combined with our previous data, these observations suggest that virion-associated DNA synthesis can occur in diverse groups of retroviruses and positively alter retroviral infectivity. As such, these manipulations may be useful for increasing the efficiency of retrovirus-mediated gene delivery.

journal of virology

Increasing transduction efficiency of recombinant murine retrovirus vectors by initiation of endogenous reverse transcription: potential utility for genetic therapies