Targeted amplification for enhanced detection of biothreat agents by next-generation sequencing

Area of Science:

• Molecular Biology
• Genomics
• Pathogen Detection

Background:

• Traditional pathogen identification methods (culture, serology, PCR) have limitations, including the need for updates and potential biases.
• Next-Generation Sequencing (NGS) offers potential but requires targeted approaches to overcome complex sample backgrounds and ensure sequencing of critical genomic regions.

Purpose of the Study:

• To assess the feasibility of targeted sequence amplification for enhancing the detection of bacterial pathogens in low-abundance samples.
• To improve pathogen identification accuracy and strain-level discrimination using NGS.

Main Methods:

• Utilized targeted amplification of specific genomic regions to enrich pathogen DNA from complex samples containing human genomic material.
• Assessed the efficacy of this approach for detecting bacterial pathogens present at low copy numbers (as low as 10 copies/mL).

Main Results:

• Targeted amplification successfully identified pathogen genomic material in samples with as few as 10 genome equivalents.
• Accurate species and strain identification was achieved with amplified samples, a feat not possible with unamplified samples.

Conclusions:

• Targeted amplification is an effective strategy for biothreat detection, offering redundancy through multiple discriminative amplicons.
• Strain-level discrimination is achievable at 10 genome equivalents, highlighting the method's sensitivity and specificity.
• This approach is crucial for overcoming the challenges posed by complex clinical and environmental samples in NGS-based pathogen detection.