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Prepublished online as a Blood First Edition Paper on May 22, 2003; DOI 10.1182/blood-2003-02-0536.
Blood, 15 September 2003, Vol. 102, No. 6, pp. 2081-2084 Fanconi anemia type Cdeficient hematopoietic stem/progenitor cells exhibit aberrant cell cycle controlFrom the Department of Pediatrics, Herman B Wells Center for Pediatric Research, Department of Medicine, Department of Microbiology/Immunology, Indiana University School of Medicine, Indianapolis, IN.
The pathogenesis of bone marrow failure in Fanconi anemia is poorly understood. Suggested mechanisms include enhanced apoptosis secondary to DNA damage and altered inhibitory cytokine signaling. Recent data determined that disrupted cell cycle control of hematopoietic stem and/or progenitor cells disrupts normal hematopoiesis with increased hematopoietic stem cell cycling resulting in diminished function and increased sensitivity to cell cyclespecific apoptotic stimuli. Here, we used Fanconi anemia complementation type Cdeficient (Fancc/) mice to demonstrate that Fancc/ phenotypically defined cell populations enriched for hematopoietic stem and progenitor cells exhibit increased cycling. In addition, we established that the defect in cell cycle regulation is not a compensatory mechanism from enhanced apoptosis occurring in vivo. Collectively, these data provide a previously unrecognized phenotype in Fancc/ hematopoietic stem/progenitor cells, which may contribute to the progressive bone marrow failure in Fanconi anemia.
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