Building Efficient Stem Cell-Derived Mouse Blastocyst Models for Environmental Studies

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Reproductive Biology

Background:

• Stem cell-based embryo models are crucial for studying early mammalian development and environmental impacts.
• Existing models may lack fidelity or scalability for comprehensive analysis.

Purpose of the Study:

• To present a robust and accessible protocol for generating high-fidelity mouse blastoids.
• To establish a scalable platform for modeling pre-implantation development and assessing environmental influences.

Main Methods:

• Generation of iGATA4-blastoids using embryonic stem cells (ESCs), trophoblast stem cells (TSCs), and inducible GATA4-ESCs.
• Detailed step-by-step protocol for blastoid assembly, fixation, staining, and imaging.
• Application in high-throughput assays to assess environmental factors on blastoid development.

Main Results:

• iGATA4-blastoids accurately recapitulate E4.5 blastocyst morphology, lineage proportions (primitive endoderm, epiblast, trophectoderm), and transcriptional signatures.
• The protocol enables reproducible quantification of morphological and developmental changes in response to environmental factors.
• Demonstrated utility in high-throughput screening of environmental influences.

Conclusions:

• The developed protocol provides a scalable and reliable in vitro system for studying pre-implantation mammalian development.
• This platform facilitates dissection of early lineage decisions and multiparametric screening of developmental influences.
• Enables rapid and reproducible assessment of environmental or molecular impacts on blastocyst formation.