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Updated: Jun 19, 2026
Structure-function Studies in Mouse Embryonic Stem Cells Using Recombinase-mediated Cassette Exchange
Published on: April 27, 2017
Chemical genetics identifies c-Src as an activator of primitive ectoderm formation in murine embryonic stem cells
Malcolm A Meyn1, Thomas E Smithgall
1University of Pittsburgh School of Medicine, Department of Microbiology and Molecular Genetics, Pittsburgh, PA 15213-2536, USA. mam71@pitt.edu
Abstract:
Multiple Src family kinases (SFKs) are present in murine embryonic stem (mES) cells. Whereas complete inhibition of SFK activity blocks mES cell differentiation, sole inhibition of the SFK member c-Yes induces differentiation. Thus, individual SFKs may have opposing roles in the regulation of mES cell fate. To test this possibility, we generated SFK mutants with engineered resistance to a nonselective SFK inhibitor. The presence of an inhibitor-resistant c-Src mutant, but not analogous mutants of Hck, Lck, c-Yes, or Fyn, reversed the differentiation block associated with inhibitor treatment, resulting in the formation of cells with properties of primitive ectoderm. These results show that distinct SFK signaling pathways regulate mES cell fate and demonstrate that the formation of primitive ectoderm is regulated by the activity of c-Src.
Insights
Murine embryonic stem cell (mESC) differentiation is regulated by Src family kinases (SFKs). Specific SFK activity, particularly c-Src, is crucial for primitive ectoderm formation, opposing other SFKs like c-Yes.
Area of Science:
- Stem cell biology
- Molecular and cellular biology
- Biochemistry
Background:
- Murine embryonic stem cells (mESCs) possess multiple Src family kinases (SFKs).
- Complete SFK inhibition halts mESC differentiation, while c-Yes inhibition promotes it, suggesting opposing roles in cell fate.
- Understanding the specific roles of individual SFKs is key to controlling mESC differentiation.
Purpose of the Study:
- To investigate the distinct roles of individual SFKs in regulating mESC fate.
- To determine if specific SFKs can override differentiation blocks induced by broad SFK inhibition.
- To elucidate the signaling pathways governing primitive ectoderm formation in mESCs.
Main Methods:
- Generation of SFK mutants engineered for resistance to a nonselective SFK inhibitor.
- Treatment of mESCs with the SFK inhibitor in the presence of wild-type or resistant SFK mutants.
- Assessment of mESC differentiation and formation of primitive ectoderm-like cells.
Main Results:
- The presence of an inhibitor-resistant c-Src mutant reversed the differentiation block caused by SFK inhibition.
- Mutants of Hck, Lck, c-Yes, and Fyn did not rescue the differentiation block.
- Specific SFK signaling pathways differentially regulate mESC fate, with c-Src activity being critical for primitive ectoderm formation.
Conclusions:
- Distinct SFK signaling pathways exert opposing effects on mESC fate determination.
- c-Src activity is a key regulator of primitive ectoderm formation in mESCs.
- Targeting specific SFKs offers a potential strategy for controlling mESC differentiation.
