A high-throughput assay for quantitative measurement of PCR errors

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• DNA polymerase accuracy is crucial for sensitive PCR-based assays and varies significantly between enzymes.
• Assessing polymerase error rates is essential but challenging with existing methods.
• Factors like PCR conditions and enzyme proofreading influence nucleotide misincorporation.

Purpose of the Study:

• To develop and validate a high-resolution, scalable, and accurate method for studying DNA polymerase errors.
• To comprehensively characterize individual errors introduced by different polymerases under various conditions.
• To identify factors influencing PCR error rates, including template sequence position and polymerase-specific preferences.

Main Methods:

• Utilized unique molecular identifier (UMI) tagging combined with high-throughput sequencing.
• Developed a less laborious, scalable, robust, and accurate protocol for error analysis.
• Conducted nine PCR assays to measure polymerase accuracies and characterize error profiles.

Main Results:

• Measured a range of DNA polymerase accuracies consistent with previous observations.
• Comprehensively described individual errors after 20 PCR cycles and linear amplification.
• Revealed specific substitution preferences and diverse PCR error frequency profiles.
• Demonstrated that high-frequency PCR errors are recurrent and influenced by template position and polymerase type.

Conclusions:

• The novel UMI and high-throughput sequencing method provides exceptional resolution for studying polymerase errors.
• The method allows for detailed characterization of polymerase fidelity and error patterns.
• Template sequence position and polymerase-specific substitution preferences are key determinants of PCR error rates.