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Essential role of Mash-2 in extraembryonic development
F Guillemot1, A Nagy, A Auerbach
1Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.
Nature
|September 22, 1994
Summary
The Mash-2 gene is critical for mammalian placental development. Mice lacking Mash-2 function die due to placental failure, highlighting its essential role in trophoblast lineage development.
Area of Science:
- Developmental Biology
- Genetics
- Mammalian Embryogenesis
Background:
- Trophectoderm differentiation is the initial cell lineage specification in mouse embryos.
- The genetic control of trophectoderm development is largely unknown.
- Mash-2 is a transcription factor expressed in the extraembryonic trophoblast lineage.
Purpose of the Study:
- To investigate the role of the Mash-2 gene in mammalian embryonic development.
- To determine the function of Mash-2 in trophoblast lineage specification and placental formation.
Main Methods:
- Gene targeting was used to create Mash-2 knockout mice (Mash-2-/-).
- Analysis of embryonic development and placental morphology in Mash-2-/- embryos.
- Chimeric analysis using tetraploid wild-type embryos to rescue placental defects.
Main Results:
- Mash-2-/- embryos exhibit placental failure and die at 10 days postcoitum.
- Mutant placentas lack spongiotrophoblast cells and show reduced chorionic ectoderm.
- Mash-2 is dispensable for embryonic development, as Mash-2-/- embryos are viable and develop normally.
Conclusions:
- Mash-2 is essential for proper mammalian placental development.
- The Mash-2 gene plays a critical role in the development of the trophoblast lineage.
- Mash-2 function is specifically required for extraembryonic tissues, not the embryo proper.