Stem cell marking with promotor-deprived self-inactivating retroviral vectors does not lead to induced clonal imbalance.
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Stem cell marking with promotor-deprived self-inactivating retroviral vectors does not lead to induced clonal imbalance. / Cornils, Kerstin; Lange, Claudia; Schambach, Axel; Brugman, Martijn H; Nowak, Regine; Lioznov, Michael; Baum, Christopher; Fehse, Boris.
In: MOL THER, Vol. 17, No. 1, 1, 2009, p. 131-143.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Stem cell marking with promotor-deprived self-inactivating retroviral vectors does not lead to induced clonal imbalance.
AU - Cornils, Kerstin
AU - Lange, Claudia
AU - Schambach, Axel
AU - Brugman, Martijn H
AU - Nowak, Regine
AU - Lioznov, Michael
AU - Baum, Christopher
AU - Fehse, Boris
PY - 2009
Y1 - 2009
N2 - Stable genetic modification of stem cells holds great promise for gene therapy and marking, but commonly used gamma-retroviral vectors were found to influence growth/survival characteristics of hematopoietic stem cells (HSCs) by insertional mutagenesis. In this article, we show that promoter-deprived gamma-retroviral self-inactivating (pd-SIN) vectors allow stable genetic marking of serially reconstituting murine HSC. In contrast to findings with gamma-retroviral long terminal repeat (LTR) vectors, serial transplantation of pd-SIN-marked HSC in a sensitive mouse model was apparently not associated with induced clonal imbalance of gene-marked HSC. Furthermore, insertions of pd-SIN into protooncogenes, growth-promoting and signaling genes occurred significantly less frequent than in control experiments with LTR vectors. Also, transcriptional dysregulation of neighboring genes potentially caused by the pd-SIN insertion was rarely seen and comparatively weak. The integration pattern of promotor-deprived SIN vectors in reconstituting HSC seems to depend on the transcriptional activity of the respective gene loci reflecting the picture described for LTR vectors. In conclusion, our data strongly support the use of SIN vectors for gene-marking studies and suggest an increased therapeutic index for vectors lacking enhancers active in HSC.
AB - Stable genetic modification of stem cells holds great promise for gene therapy and marking, but commonly used gamma-retroviral vectors were found to influence growth/survival characteristics of hematopoietic stem cells (HSCs) by insertional mutagenesis. In this article, we show that promoter-deprived gamma-retroviral self-inactivating (pd-SIN) vectors allow stable genetic marking of serially reconstituting murine HSC. In contrast to findings with gamma-retroviral long terminal repeat (LTR) vectors, serial transplantation of pd-SIN-marked HSC in a sensitive mouse model was apparently not associated with induced clonal imbalance of gene-marked HSC. Furthermore, insertions of pd-SIN into protooncogenes, growth-promoting and signaling genes occurred significantly less frequent than in control experiments with LTR vectors. Also, transcriptional dysregulation of neighboring genes potentially caused by the pd-SIN insertion was rarely seen and comparatively weak. The integration pattern of promotor-deprived SIN vectors in reconstituting HSC seems to depend on the transcriptional activity of the respective gene loci reflecting the picture described for LTR vectors. In conclusion, our data strongly support the use of SIN vectors for gene-marking studies and suggest an increased therapeutic index for vectors lacking enhancers active in HSC.
M3 - SCORING: Zeitschriftenaufsatz
VL - 17
SP - 131
EP - 143
JO - MOL THER
JF - MOL THER
SN - 1525-0016
IS - 1
M1 - 1
ER -
