Early developmental plasticity enables the induction of an intermediate extraembryonic cell state

Area of Science:

• Developmental biology
• Stem cell biology
• Genetics

Background:

• Pre-implantation embryogenesis involves complex self-organization and developmental plasticity.
• Understanding the mechanisms governing these processes, particularly in extraembryonic lineages, remains a challenge.

Purpose of the Study:

• To investigate the self-organization program and developmental plasticity of extraembryonic lineages during pre-implantation embryogenesis.
• To establish culture conditions that allow the coexistence of primitive endoderm and trophectoderm fates.

Main Methods:

• Developed novel in vitro culture conditions for mouse blastocysts.
• Analyzed cell fate plasticity and self-organization of extraembryonic lineages.

Main Results:

• Established conditions enabling primitive endoderm and trophectoderm to coexist.
• Demonstrated extended potential for extraembryonic chimerism following first lineage segregation.
• Observed robust assembly into blastocyst-like structures, showcasing combined cell fate plasticity and self-organization.

Conclusions:

• The study reveals a shared state of plasticity in early extraembryonic lineages.
• This plasticity is crucial for self-organization and the formation of higher-order structures during pre-implantation development.
• The findings provide new insights into the fundamental mechanisms of early embryonic development.