Hi-C in Budding Yeast.

Area of Science:

• Genomics
• Molecular Biology
• Biotechnology

Background:

• Chromosome conformation capture (3C) is a foundational technique for studying 3D genome organization.
• Understanding spatial chromatin interactions is crucial for deciphering gene regulation and genome function.

Purpose of the Study:

• To describe a detailed protocol for the Hi-C method.
• To enable simultaneous detection of interaction frequencies between all genomic restriction fragments.
• To achieve high-resolution mapping of chromatin interactions and chromosome conformation.

Main Methods:

• Formaldehyde cross-linking to fix interacting chromatin regions in vivo.
• Digestion with restriction enzyme HindIII, followed by biotinylated nucleotide fill-in.
• Ligation of proximity-ligated fragments to create chimeric molecules.
• Purification, shearing, and enrichment of biotinylated ligation junctions using streptavidin beads.
• Adaptor ligation, PCR amplification, and high-throughput sequencing.

Main Results:

• Simultaneous detection of interaction frequencies across all pairs of restriction fragments.
• Generation of genome-wide chromatin interaction maps.
• Potential for single restriction fragment resolution depending on sequencing depth.

Conclusions:

• The described Hi-C protocol provides a comprehensive method for genome-wide interaction analysis.
• Hi-C facilitates detailed insights into chromosome conformation and spatial genome architecture.
• The resolution and utility of Hi-C data are directly influenced by sequencing depth and enzyme choice.