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Updated: Sep 23, 2025
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Double Whole Mount in situ Hybridization of Early Chick Embryos
Published on: October 27, 2008
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Genome architecture and totipotency: An intertwined relation during early embryonic development
1Laboratory of Genome Integrity, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA.
Summary
Early embryo development involves genome refolding, impacting cell plasticity and developmental potential. Chromatin organization loss can reawaken totipotent cell programs, highlighting the link between genome folding and developmental plasticity.
Area of Science:
- Epigenetics
- Developmental Biology
- Genomics
Background:
- Chromosomes form higher-order structures with specific functions.
- Early embryonic genomes undergo epigenetic reprogramming, characterized by chromatin relaxation and loss of 3D structure.
- This is followed by gradual genome refolding during preimplantation development.
Purpose of the Study:
- To discuss the impact of genome folding on controlling transcriptional programs in early development.
- To explore the association between chromatin organization and cell plasticity.
- To investigate how genome folding influences the expression of plastic-associated features.
Main Methods:
- Review of existing literature on chromatin structure and epigenetic reprogramming.
- Analysis of the relationship between genome refolding and developmental potential.
- Examination of studies involving CTCF depletion in embryonic stem cells.
Main Results:
- Genome refolding during early development correlates with a decrease in developmental potential.
- Loss of chromatin architecture, such as upon CTCF depletion, can lead to the upregulation of totipotent cell transcriptional programs.
- This suggests a direct link between chromatin organization and cell plasticity.
Conclusions:
- Genome folding plays a critical role in regulating gene expression during early development.
- Chromatin architecture influences cell plasticity and developmental potential.
- Understanding genome folding is key to comprehending early developmental processes and cell fate decisions.
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