Hi-C 3.0: Improved Protocol for Genome-Wide Chromosome Conformation Capture

Area of Science:

• Genomics
• Molecular Biology
• Epigenetics

Background:

• Chromatin folding is crucial for genome storage and cell function.
• Hi-C (chromosome conformation capture) is a key technology for studying genome organization by detecting pairwise chromatin interactions.
• Advancements in next-generation sequencing have enabled higher resolution chromatin interaction maps.

Purpose of the Study:

• To provide an in-depth, up-to-date guide for performing Hi-C on mammalian cell lines.
• To present protocol improvements for enhanced resolution in chromatin interaction mapping.
• To offer a versatile Hi-C procedure for detecting genome folding features across various distances.

Main Methods:

• Chemical cross-linking to capture nuclear conformation.
• Restriction enzyme digestion and biotin labeling of DNA fragments.
• Ligation of proximally located fragments, enrichment, and high-throughput sequencing.
• Incorporation of enhanced cross-linking and restriction enzyme cocktails for improved resolution.

Main Results:

• The described Hi-C protocol enables high-resolution mapping of chromatin interactions.
• Improvements in cross-linking and enzyme digestion increase the assay's resolution potential.
• The procedure is versatile, allowing detection of genome folding at diverse genomic distances.

Conclusions:

• The updated Hi-C protocol provides a robust method for studying 3D genome organization in mammalian cells.
• Enhanced techniques lead to more detailed chromatin interaction maps.
• This protocol facilitates a comprehensive understanding of genome folding and its functional implications.