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Related Experiment Video

Updated: Feb 7, 2026

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From 1D sequence to 3D chromatin dynamics and cellular functions: a phase separation perspective.

Sirui Liu1, Ling Zhang1,2, Hui Quan1

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Summary

Genomic regions called CpG island (CGI) forests and prairies segregate spatially, influencing gene regulation. This segregation changes with cell type and biological processes like development and aging.

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Area of Science:

  • Genomics
  • Epigenetics
  • Cell Biology

Background:

  • High-order chromatin structure is crucial for gene regulation, but its sequence-dependent formation in different cells is unclear.
  • Genomes exhibit uneven nucleotide distributions, leading to distinct genomic domains.
  • CpG island (CGI) densities define unique genomic regions.

Purpose of the Study:

  • To investigate the mechanism of varied chromatin structure formation.
  • To define and characterize CGI forests and prairies as distinct genomic domains.
  • To understand how these domains contribute to cell identity and biological processes.

Main Methods:

  • Identification of CGI forests and prairies based on species-specific CGI densities.
  • Analysis of spatial segregation of these domains in different cell types.
  • Correlation of domain segregation with development, differentiation, and senescence.

Main Results:

  • CpG island (CGI) forests and prairies are megabase-sized, distinct genomic domains.
  • These domains exhibit cell-type-specific spatial segregation.
  • Segregation patterns change during development, differentiation, and senescence, contributing to cell identity.

Conclusions:

  • The 1D mosaic genome sequence, through phase separation, shapes 3D chromatin structure.
  • Epigenetic marks and transcription factors further refine cell-type-specific chromatin organization.
  • This model explains chromatin and epigenetic changes across biological processes and species.