Based on high-level secondary research, current production systems allow for titers of ~106 – 108 functional virus particles per ml of lysate. Neverthe-less, optimization of virus yield may be of interest (i) for economic reasons and (ii) for larger Phase II / Phase III trials.<br><br> A novel possibility has been found to increase the yield of retroviruses or viral particles thereof from cells by APOBEC4 (Apolipoprotein B mRNA-editing catalytic polypeptide 4) or a modified APOBEC4. APOBEC4 is a human cellular gene belonging to the super family of RNA/DNA editing cytidine deaminases. It could be shown that the presence of N-terminal modified APOBEC4 may increase the yield of retro- or lentiviral vectors produced by a factor of up to 6. <br><br> Thus, these results position N-terminal modified stabilized APOBEC4 as a new agent to increase the production of retroviral vectors for gene therapy and offer a new interesting approach to identify drugs in a cell-based assay that may suppress HIV replication by suppressing APOBEC4. <br><br>
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