Cas12a-Capture: A Novel, Low-Cost, and Scalable Method for Targeted Sequencing

Area of Science:

• Molecular Biology
• Genomics
• Biotechnology

Background:

• Targeted sequencing is crucial for clinical and research uses.
• Existing methods face challenges like GC bias, high DNA input, and cost.
• CRISPR-Cas12a technology offers potential for DNA manipulation.

Purpose of the Study:

• To develop a novel, cost-effective, and scalable targeted sequencing method.
• To address limitations of current targeted sequencing technologies.
• To create a versatile tool for DNA enrichment and analysis.

Main Methods:

• Developed Cas12a-Capture, a CRISPR-Cas12a-based targeted DNA enrichment method.
• Utilized guide RNAs to direct Cas12a cleavage and adapter ligation.
• Optimized guide set design through pilot experiments and modeling.
• Generated targeted sequence libraries via adapter addition and enrichment.

Main Results:

• Achieved an average 64-fold enrichment of targeted DNA regions.
• Demonstrated minimal Guanine-Cytosine (GC) sequence content bias.
• Showed strong concordance with established variant calling methods (Illumina Platinum Genome).
• Identified potential for improved variant calling with quality heuristics.

Conclusions:

• Cas12a-Capture is a low-cost, scalable, and efficient targeted sequencing solution.
• The method overcomes key limitations of existing technologies.
• Cas12a-Capture has broad potential in clinical diagnostics and biological research.
• The technology is adaptable for selective enrichment of any double-stranded DNA template.