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The SCL gene specifies haemangioblast development from early mesoderm
M Gering1, A R Rodaway, B Göttgens
1University of Cambridge, Department of Haematology, MRC Centre, Hills Road, Cambridge CB2 2QH, UK.
The EMBO Journal
|July 22, 1998
Summary
The SCL gene is crucial for developing blood and blood vessel precursors, known as haemangioblasts. This study reveals SCL
Area of Science:
- Developmental Biology
- Hematology
- Genetics
Background:
- The SCL gene encodes a basic helix-loop-helix (bHLH) transcription factor vital for hematopoietic lineage development.
- SCL's role in endothelial cell development is unclear, despite its expression in these cells.
Purpose of the Study:
- To investigate the function of the zebrafish SCL homologue in early embryonic development.
- To determine if SCL plays a role in specifying common hematopoietic and endothelial precursors (haemangioblasts).
Main Methods:
- Isolated the zebrafish SCL homologue.
- Examined SCL co-expression patterns in early mesoderm with progenitor markers.
- Analyzed the effects of ectopic SCL mRNA expression in zebrafish embryos.
Main Results:
- Zebrafish SCL is co-expressed with hematopoietic, endothelial, and pronephric progenitor markers in early mesoderm.
- Ectopic SCL expression led to increased hematopoietic and endothelial precursors, disrupted vasculogenesis, and loss of pronephric duct and somitic tissue.
- Notochord and neural tube formation remained unaffected by SCL overexpression.
Conclusions:
- Provides the first evidence that SCL specifies the formation of haemangioblasts, the common precursor for blood and endothelial lineages.
- Highlights conserved roles of bHLH proteins in specifying different cell lineages, including hematopoietic/endothelial and muscle/neural development.