Fanconi anemia (FA) is a rare autosomal recessive disease, characterized by bone marrow failure and cancer predisposition. So far, 8 complementation groups have been identified, although mutations in FANCA account for the disease in the majority of FA patients. In this study we characterized the hematopoietic phenotype of a Fanca knockout mouse model and corrected the main phenotypic characteristics of the bone marrow (BM) progenitors using retroviral vectors. The hematopoiesis of these animals was characterized by a modest though significant thrombocytopenia, consistent with reduced numbers of BM megakaryocyte progenitors. As observed in other FA models, the hematopoietic progenitors from Fanca-/- mice were highly sensitive to mitomycin C (MMC). In addition, we observed for the first time in a FA mouse model a marked in vitro growth defect of Fanca-/- progenitors, either when total BM or when purified Lin-Sca-1+ cells were subjected to in vitro stimulation. Liquid cultures of Fanca-/- BM that were stimulated with stem cell factor plus interleukin-11 produced low numbers of granulocyte macrophage colony-forming units, contained a high proportion of apoptotic cells, and generated a decreased proportion of granulocyte versus macrophage cells, compared to normal BM cultures. Aiming to correct the phenotype of Fanca-/- progenitors, purified Lin-Sca-1+ cells were transduced with retroviral vectors encoding the enhanced green fluorescent protein (EGFP) gene and human FANCA genes. Lin-Sca-1+ cells from Fanca-/- mice were transduced with an efficiency similar to that of samples from wild-type mice. More significantly, transductions with FANCA vectors corrected both the MMC hypersensitivity as well as the impaired ex vivo expansion ability that characterized the BM progenitors of Fanca-/- mice.
|Original language||English (US)|
|Number of pages||8|
|State||Published - Sep 15 2002|
ASJC Scopus subject areas
- Cell Biology