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a Pathology Department and
b Department of Cell Biology and Genetics, Erasmus University, Rotterdam, Netherlands
Key Words. Hematopoietic stem cells • Sca-1 • Ly-6A GFP • Transgenic mouse
Correspondence:
E. Dzierzak, Ph.D., Department of Cell Biology and Genetics, Erasmus University, P.O. Box 1738, 3000 DR Rotterdam, Netherlands. Telephone: 31-10-408-7169; Fax: 31-10-408-9468; e-mail: dzierzak{at}ch1.fgg.eur.nl
The Sca-1 cell surface glycoprotein is used routinely as a marker of adult hematopoietic stem cells (HSCs), allowing a >100-fold enrichment of these rare cells from the bone marrow of the adult mouse. The Sca-1 protein is encoded by the Ly-6A/E gene, a small 4-exon gene that is tightly controlled in its expression in HSCs and several hematopoietic cell types. For the ability to sort and localize HSCs directly from the mouse, we initiated a transgenic approach in which we created Ly-6A (Sca-1) green fluorescent protein (GFP) transgenic mice. We show here that a 14-kb Ly-6A expression cassette directs the transcription of the GFP marker gene in all functional repopulating HSCs in the adult bone marrow. A >100-fold enrichment of HSCs occurred by sorting for the GFP-expressing cells. Furthermore, as shown by fluorescence-activated cell sorting and histologic analysis of several hematopoietic tissues, the GFP transgene expression pattern generally corresponded to that of Sca-1. Thus, the Ly-6A GFP transgene facilitates the enrichment of HSCs and presents the likelihood of identifying HSCs in situ.
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