Automated, High-Throughput Phenotypic Screening and Analysis Platform to Study Pre- and Post-Implantation...

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Toxicology

Background:

• Early embryonic development is crucial for reproductive medicine and drug development.
• Current methods for studying early embryogenesis are limited in scale and throughput.
• Understanding peri-implantation development is key to addressing infertility and developmental abnormalities.

Purpose of the Study:

• To develop a scalable 3D stem cell model for studying peri-implantation epiblast (Epi)/extraembryonic endoderm (XEn) development.
• To establish an in situ imaging-based readout for high-content screening of developmental processes.
• To investigate the spatiotemporal effects of signaling pathway modulators on early embryonic development.

Main Methods:

• High-throughput generation and high-content imaging of a 3D stem cell model (XEn/EPiCs) with an expanded pro-amniotic cavity (PAC).
• Continuous culture and in situ imaging-based readout in microwell platforms.
• Automated image analysis and supervised machine learning for identifying developmental events and classifying phenotypes.
• Screening with signaling pathway modulators (Wnt, Fgf/MAPK, BMP, Tgfβ/Nodal) at different time windows (0-72h and 48-120h).

Main Results:

• The XEn/EPiCs model successfully recapitulates peri-implantation development from E3.5 to E5.5 with an expanded PAC.
• Automated analysis accurately identified embryonic morphogenesis, tissue compartmentalization, and cell differentiation.
• Wnt and Fgf/MAPK modulators impacted Epi differentiation and polarization.
• BMP and Tgfβ/Nodal modulators affected XEn specification and epithelialization.
• Signaling pathways collectively influence the timing of PAC formation and expansion.

Conclusions:

• A scalable culture and analysis platform for early embryonic development has been established.
• This platform enables quantitative and systematic study of signaling pathway effects on embryogenesis.
• The findings provide spatiotemporal insights into the roles of key signaling pathways in early development, with implications for toxicity screening and drug development.