iHi-C 2.0: A simple approach for mapping native spatial chromatin organisation from low cell numbers

Area of Science:

• Genomics
• Molecular Biology
• Epigenetics

Background:

• Genome organization is crucial for genomic functions, including gene regulation and disease.
• 3C-based methods are vital for mapping higher-order chromosomal structures but have limitations.
• Existing protocols face challenges with fixation, enzyme use, and ligation efficiency.

Purpose of the Study:

• To introduce a streamlined protocol, iHi-C 2.0, for genome-wide analysis of native spatial chromatin contacts.
• To overcome limitations of current 3C-based approaches, such as chemical fixation dependencies.
• To enable high-resolution mapping of chromatin interactions in samples with limited cell numbers.

Main Methods:

• Development of the iHi-C 2.0 protocol, a fixation-free method for chromatin contact analysis.
• High-throughput sequencing of chromatin interactions.
• Generation of genome-wide maps of mammalian chromosome interactions.

Main Results:

• iHi-C 2.0 allows interrogation of native spatial chromatin contacts without chemical fixation.
• The protocol demonstrates improved ligation efficiency and minimal material loss.
• High signal-to-noise and focal maps of intra- and inter-chromosomal interactions are generated.

Conclusions:

• iHi-C 2.0 offers a streamlined and efficient approach for studying native chromatin organization.
• The protocol is suitable for samples with limited cell numbers, advancing genomic research.
• This method provides high-resolution insights into genome architecture under native conditions.