A 'reality check' for lab-grown human embryo models
University of Sydney researchers have developed a new way to test how closely lab-grown biological models resemble real human embryos, finding that while some models perform well, none yet fully capture the complexity of early human development.
Researchers at the University of Sydney have created a new computational framework to evaluate how accurately lab-grown human embryo models, known as blastoids, mimic genuine early human development. While some blastoid models perform well, none currently accurately replicate the full complexity of natural human embryos. Blastoids are grown from stem cells and represent a promising tool for studying fertility, pregnancy success, and early human development without using donated embryos, which face technical and ethical challenges.
The study, published in Cell Systems, analyzed four leading methods for creating blastoids and found significant differences in how faithfully they reproduce the cell types and developmental processes seen in natural human embryos. By comparing these models against a detailed reference map of early human embryo development compiled from over 14,000 single-cell transcriptomes, researchers were able to benchmark their biological accuracy.
The findings show that while some blastoid models capture key aspects of early embryonic development reasonably well, none fully match the biological characteristics of real human embryos. Lead author Pengyi Yang emphasized that the framework provides a standardized way to assess model fidelity and limitations, enabling researchers to better understand what these models can and cannot reveal about early human development.
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