BTK gene targeting in a hematopoietic stem cell using an adenovirus adeno-associate virus hybrid vector

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For gene therapy of X-linked agammaglobulinemia, a helper-dependent adenovirus adeno-associated virus hybrid vector was constructed that contains Bruton' s tyrosin kinase gene. We analyzed an efficiency of targeted integration or gene repair through homologous recombination(HR) into hematopoietic stem cells(HSCs). The efficiency of HR reached 0. 073% per infected Nalm-6 cells. In HSCs derived human cord blood, integration was detected at 3. 6^* 10e-6 per spreading cells, and HR was revealed 0. 7% of those integrations. Furthermore, detection of integration or HR at DNA level by PCR revealed IgM positive-immature B cells that induced from HSCs. We also characterized chromosomal sites where the vector tends to integrate in a non-random manner by LAM-PCR.