Quantitative analysis of chromatin interaction changes upon a 4.3 Mb deletion at mouse 4E2

Area of Science:

• Genomics
• Molecular Biology
• Biophysics

Background:

• Circular chromosome conformation capture (4C) is crucial for understanding 3D genome organization and gene expression regulation.
• Previous methods lacked quantitative analysis for complex 4C data.

Purpose of the Study:

• To develop a quantitative polymer physics framework for analyzing paired-end sequencing 4C (PE-4Cseq) data.
• To investigate the impact of a large DNA deletion on chromatin interactions and gene expression.

Main Methods:

• Development of a novel quantitative framework based on polymer physics for PE-4Cseq data analysis.
• Application of the framework to study chromatin changes in a mouse model with a 4.3 Mb DNA deletion.
• Validation of identified differentially interacting regions (DIRs) using 3D DNA FISH.

Main Results:

• Significant changes in chromatin interactions (DIRs) and compaction were detected upon DNA deletion compared to wild-type.
• Validated DIRs show robustness of the PE-4Cseq analysis pipeline.
• Overlaps found between DIRs, CTCF/Smc1 binding sites, and differentially expressed genes.

Conclusions:

• The PE-4Cseq analysis pipeline offers a comprehensive method for characterizing DNA deletion effects on chromatin structure.
• This approach provides insights into the functional consequences of altered 3D genome organization.