Assembly of a stem cell-derived human postimplantation embryo model

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Human Embryogenesis

Background:

• Human embryonic and extraembryonic tissue interactions during implantation are poorly understood.
• Studying these early developmental stages in human embryos is challenging.
• Pluripotent stem cells offer a model system for investigating early human development.

Purpose of the Study:

• To develop a tractable in vitro model for studying human embryogenesis at implantation.
• To investigate the roles of specific transcription factors in extraembryonic lineage specification.
• To create self-organized embryo-like structures from human stem cells.

Main Methods:

• Activation of specific transcription factors (GATA6, SOX17, GATA3, TFAP2C) in human embryonic stem (ES) cells to induce extraembryonic-like cell fates.
• Co-culture of induced extraembryonic-like cells with wild-type ES cells to form self-organized structures (human inducible embryoids, hiEmbryoids).
• Observation of hiEmbryoid development, including epiblast polarization, differentiation, and specification of extraembryonic lineages.

Main Results:

• Human ES cells can be converted to extraembryonic-like cells by activating specific transcription factors.
• Co-culture of these cells generates self-organized human inducible embryoids (hiEmbryoids).
• hiEmbryoids recapitulate key aspects of early human development, including epiblast differentiation and extraembryonic tissue formation.

Conclusions:

• Human inducible embryoids provide a novel model for studying peri-implantation human development.
• This model allows for tractable experimentation on embryonic-extraembryonic interactions.
• The protocol is efficient (7-10 days) and accessible to researchers with basic stem cell expertise.