Robust Sub-nanomolar Library Preparation for High Throughput Next Generation Sequencing

Area of Science:

• Genomics
• Molecular Biology
• Next-Generation Sequencing

Background:

• Standard Illumina protocols require high initial library concentrations (≥2 nM) for DNA sequencing.
• Low DNA/RNA input samples or limited PCR amplification present challenges for achieving sufficient library amounts.
• A validated sub-nanomolar protocol for Illumina sequencers is lacking.

Purpose of the Study:

• To develop and validate a robust sub-nanomolar library preparation protocol for Illumina sequencers.
• To enable high-quality sequencing from samples with limited DNA or RNA input.
• To achieve results comparable to standard protocols using higher library inputs.

Main Methods:

• Developed and tested a sub-nanomolar library preparation protocol, starting with 100 pM.
• Validated the protocol using PhiX DNA, genomic DNA, mRNA, microRNA, and small noncoding RNA.
• Evaluated protocol performance with library concentrations as low as 25 pM.

Main Results:

• The sub-nanomolar protocol (100 pM) generated robust next-generation sequencing (NGS) results comparable to standard Illumina protocols.
• Libraries prepared with concentrations as low as 25 pM yielded satisfactory and reproducible sequencing data.
• PhiX libraries at 25 pM achieved nearly 50% of reads compared to standard protocols (>2 nM).

Conclusions:

• A sub-nanomolar library preparation protocol (100 pM) is effective for generating high-quality NGS data.
• This protocol supports sequencing from low-input samples, overcoming limitations of standard methods.
• Satisfactory and reproducible results are achievable even with very low library concentrations (25 pM).