Characterization of hematopoietic progenitor cells that express the transcription factor SCL, using a lacZ "knock-in" strategy.
Gene targeting experiments have demonstrated that the transcription factor SCL is essential for primitive and definitive hematopoiesis in the mouse. To study the functional properties of hematopoietic cells expressing SCL, we have generated mutant mice (SCLlacZ/w) in which the Escherichia coli lacZ reporter gene has been "knocked in" to the SCL locus, thereby linking beta-galactosidase expression to transcription from the SCL promoter. Bone marrow cells from heterozygous SCLlacZ/w mice were sorted into fractions expressing high, intermediate and low levels of beta-galactosidase (designated lacZhigh, lacZint, and lacZneg). Cells that were lacZhigh or lacZint were enriched for day 12 spleen colony-forming units and myeloid and erythroid colony-forming cells (CFCs). These fractions included >99% of the erythroid and >90% of the myeloid CFCs. Culture of sorted bone marrow populations on stromal cells secreting interleukin-7 or in fetal thymic organ cultures showed that B and T lymphoid progenitors were also present in the lacZhigh and lacZint fractions. These data provide a functional correlation between SCL expression and colony-forming ability in immature hematopoietic cells. Our data also suggested that expression of SCL was transient and confined to hematopoietic stem and/or progenitor cells, because the differentiated progeny of most lineages (except the erythroid) were beta-galactosidase-negative.
Elefanty
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AG
The Walter and Eliza Hall Institute of Medical Research and the Cooperative Research Centre for Cellular Growth Factors, P.O. Royal Melbourne Hospital, Victoria 3050, Australia. elefanty@wehi.edu.au
Begley
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CG
Metcalf
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D
Barnett
L
L
Köntgen
F
F
Robb
L
L
D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology; D051792:Basic Helix-Loop-Helix Proteins; D003114:Colony-Forming Units Assay; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D015870:Gene Expression; D018390:Gene Targeting; D017930:Genes, Reporter; D005818:Genetic Engineering; D005822:Genetic Vectors; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000378:metabolism*; D007763:Lac Operon; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D008822:Mice, Transgenic; D011518:Proto-Oncogene Proteins; D000073942:T-Cell Acute Lymphocytic Leukemia Protein 1; D013601:T-Lymphocytes / Q000166:cytology; D014157:Transcription Factors; D001616:beta-Galactosidase / Q000235:genetics
D051792:Basic Helix-Loop-Helix Proteins; D004268:DNA-Binding Proteins; D011518:Proto-Oncogene Proteins; D000073942:T-Cell Acute Lymphocytic Leukemia Protein 1; D014157:Transcription Factors; D001616:beta-Galactosidase; C489366:Tal1 protein, mouse