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Ex Vivo Expansion of Retrovirally Transduced Primate CD34+ Cells Results in Overrepresentation of Clones With MDS1/EVI1 Insertion Sites in the Myeloid Lineage After Transplantation.
- Source :
-
Molecular Therapy . Sep2010, Vol. 18 Issue 9, p1633-1639. 7p. - Publication Year :
- 2010
-
Abstract
- Activation of proto-oncogenes by retroviral insertion is an important issue delaying clinical development of gene therapy. We have reported the nonrandom persistence of hematopoietic clones with vector insertions within the MDS1/EVI1 locus following transplantation of rhesus macaques. We now ask whether prolonged culture of transduced CD34+ cells before transplantation selects for clones with insertions in the MDS1/EVI11 or other proto-oncogene loci. CD34+ cells were transduced with standard retroviral vectors for 4 days and then continued in culture for an additional 6 days before transplantation. A 15% of insertions identified in granulocytes 6 months post-transplant were in MDS1/EVI11, significantly increased compared to the frequency in animals transplanted with cells immediately following transduction. MDS1/EVI1 clones became more dominant over time post-transplantation in one animal that was followed long term, accompanied by an increased overall copy number of vector-containing granulocytes, with one MDS1/EVI1 clone eventually accounting for 100% of transduced granulocytes and marrow colony-forming unit (CFU). This vector insertion increased the expression of Evi1 mRNA. There was no overrepresentation of MDS1/EVI1 insertions contributing to lymphoid lineages. Strategies involving prolonged ex vivo expansion of transduced cells may increase the risk of genotoxicity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15250016
- Volume :
- 18
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Molecular Therapy
- Publication Type :
- Academic Journal
- Accession number :
- 53300640
- Full Text :
- https://doi.org/10.1038/mt.2010.117