Abstract:
:X-linked chronic granulomatous disease (X-CGD) is an inherited immunodeficiency with absent phagocyte NADPH-oxidase activity caused by defects in the gene-encoding gp91(phox). Here, we evaluated strategies for less intensive conditioning for gene therapy of genetic blood disorders without selective advantage for gene correction, such as might be used in a human X-CGD protocol. We compared submyeloablative with ablative irradiation as conditioning in murine X-CGD, examining engraftment, oxidase activity and vector integration in mice transplanted with marrow transduced with a gamma-retroviral vector for gp91(phox) expression. The frequency of oxidase-positive neutrophils in the donor population was unexpectedly higher in many 300 cGy-conditioned mice compared with lethally irradiated recipients, as was the fraction of vector-marked donor secondary CFU-S12. Vector integration sites in marrow, spleen and secondary CFU-S12 DNA from primary recipients were enriched for cancer-associated genes, including Evi1, and integrations in or near cancer-associated genes were more frequent in marrow and secondary CFU-S12 from 300 cGy-conditioned mice compared with fully ablated mice. These findings support the concept that vector integration can confer a selection bias, and suggest that the intensity of the conditioning regimen may further influence the effects of vector integration on clonal selection in post-transplant engraftment and hematopoiesis.
journal_name
Gene Therjournal_title
Gene therapyauthors
Sadat MA,Dirscherl S,Sastry L,Dantzer J,Pech N,Griffin S,Hawkins T,Zhao Y,Barese CN,Cross S,Orazi A,An C,Goebel WS,Yoder MC,Li X,Grez M,Cornetta K,Mooney SD,Dinauer MCdoi
10.1038/gt.2009.96subject
Has Abstractpub_date
2009-12-01 00:00:00pages
1452-64issue
12eissn
0969-7128issn
1476-5462pii
gt200996journal_volume
16pub_type
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