Spatial chromatin accessibility sequencing resolves high-order spatial interactions of epigenomic markers.

Area of Science:

• Genomics
• Epigenetics
• Molecular Biology

Background:

• The genome's 3D structure influences epigenomic information, but spatial arrangement is often overlooked in studies.
• Current epigenetic studies primarily focus on horizontal dimensions, lacking comprehensive spatial data.
• Understanding 3D genome organization is crucial for interpreting epigenomic regulation.

Purpose of the Study:

• To develop a method for simultaneously capturing 3D genome conformation and epigenomic information.
• To investigate spatial interactions of chromatin accessibility, DNA methylation, and regulatory elements.
• To explore the role of CCCTC-binding factor in spatial genome insulation.

Main Methods:

• Designed and implemented spatial chromatin accessibility sequencing (SCA-seq).
• Achieved single-molecular resolution for capturing both genome conformation and epigenetic marks.
• Integrated analysis of chromatin accessibility, CpG island methylation, and CTCF binding in 3D space.

Main Results:

• SCA-seq successfully resolved 3D genome conformation alongside epigenomic data.
• Demonstrated the ability to examine spatial interactions, including enhancer-promoter contacts.
• Visualized the spatial insulating functions of the CCCTC-binding factor.

Conclusions:

• SCA-seq provides unprecedented insights into the spatial organization of epigenomic information.
• The method enables exploration of mechanisms underlying epigenetic interactions in 3D.
• Advances knowledge of DNA packaging within the nucleus and its functional implications.