Abstract
We constructed helper-dependent, fiber-chimeric adenoviral vectors that efficiently transduce human hematopoietic stem cells. We found that vectors carrying a 23-kb fragment of the β-globin locus control region (LCR) flanked by adeno-associated virus inverted terminal repeats (Ad.LCR) preferentially integrated into the chromosomal β-globin LCR of human erythroid Mo7e cells. We hypothesized that this targeted integration involves β-globin LCR-specific chromatin structures. Chromatin immunoprecipitation assays of the β-globin LCR revealed active chromatin within, and immediately downstream of, DNase hypersensitivity region 2 (HS2) in erythroid Mo7e cells, but not in nonerythroid cells. Importantly, most of the Ad.LCR integrations in Mo7e cells were found within this area. We provide further data indicating tethering of incoming Ad.LCR genomes to the chromosomal LCR. We also provide data that suggest a role for active chromatin in AAV Rep78-mediated Ad.LCR integration. Our findings support a new strategy for achieving targeted integration through chromatin tethering of vector DNA.
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