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Updated: Jul 9, 2026
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Protocol for Human Blastoids Modeling Blastocyst Development and Implantation
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A barrier to human embryogenesis involves dysregulated 3D genome reprogramming and ZGA collapse
Yuedi Cao1, Geng G Tian2, Changliang Hou1
1Key Laboratory for the Genetics of Development & Neuropsychiatric Disorders (Ministry of Education), Bio-X Institutes, Shanghai Jiao Tong University, Shanghai, China.
Communications Biology
|July 7, 2026
Summary
Early embryonic arrest in human development is linked to failed genome reorganization and gene activation during the zygotic genome activation (ZGA) stage. This study reveals 3D genome defects and transcriptomic dysregulation contribute to embryo developmental arrest.
Area of Science:
- Reproductive Biology
- Genomics
- Developmental Biology
Background:
- Early embryonic arrest (EEA) hinders assisted reproductive technology success.
- The molecular underpinnings of EEA, particularly 3D genome organization during zygotic genome activation (ZGA), are poorly understood.
Purpose of the Study:
- To investigate the role of 3D genome reorganization and transcriptome dynamics in human embryos experiencing EEA at the ZGA stage.
Main Methods:
- Integrated analysis of chromatin architecture and transcriptome in arrested human embryos.
- Examined chromosomal compartment switching, TADs, and chromatin looping.
- Assessed gene expression related to ZGA, developmental pathways, RNA processing, and metabolism.
Main Results:
- Arrested embryos exhibit altered 3D genome organization, including compartment switching and disrupted TADs/looping.
- EEA is associated with reduced ZGA gene expression, premature activation of later developmental genes, suppressed RNA processing, and impaired energy metabolism.
- Specific transcription factors (e.g., KLF17, ZNF family) are implicated as potential regulators.
Conclusions:
- Defective 3D genome reprogramming and transcriptomic dysregulation during ZGA are key factors in human embryonic arrest at the eight-cell stage.
- Findings provide insights into preimplantation development failures and offer a framework for future research.
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