A novel CRISPR/Cas9 associated technology for sequence-specific nucleic acid enrichment

Area of Science:

• Genomics
• Molecular Biology
• Biotechnology

Background:

• Massively parallel sequencing generates vast data, but clinical applications require targeted analyses due to cost and throughput limitations.
• Current sample enrichment methods, like PCR amplification and hybrid capture, struggle with long contiguous sequences and can degrade native DNA features such as methylation.
• There is a need for efficient enrichment techniques that preserve DNA integrity for clinical sequencing.

Purpose of the Study:

• To develop and demonstrate a novel Negative Enrichment technology for targeting long genomic regions (>10 kb).
• To overcome the limitations of existing enrichment methods in terms of sequence length and preservation of native DNA characteristics.
• To provide an effective method for preparing long, non-amplified target sequences for next-generation sequencing.

Main Methods:

• Utilized CRISPR-Cas9 single guide RNA (sgRNA) complexes to specifically define the 5' and 3' termini of genomic loci.
• Targeted genomic regions ranging from 10 to 36 kb.
• Leveraged Cas9/sgRNA complexes to protect targeted DNA sequences from exonuclease degradation, enabling negative enrichment.

Main Results:

• Successfully demonstrated the targeting and enrichment of long genomic regions (10-36 kb).
• The CRISPR-Cas9 complex-mediated protection prevented DNA degradation, yielding intact target sequences.
• Produced double-strand, non-amplified target DNA suitable for downstream applications like next-generation sequencing library preparation.

Conclusions:

• The developed Negative Enrichment technology effectively targets and enriches long genomic regions.
• This method preserves native DNA features, unlike PCR-based approaches.
• The technology offers a promising solution for clinical sequencing applications requiring large, intact DNA fragments.