DNA regeneration in the polymerase chain reaction

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• DNA damage in ancient or weathered specimens can affect PCR.
• Recombination between similar DNA sequences, termed "jumping PCR," is a potential source of error.

Purpose of the Study:

• To analyze a model of DNA regeneration during PCR.
• To estimate the impact of jumping PCR on sequence determination.
• To investigate methods for increasing DNA fragment length for PCR.

Main Methods:

• Mathematical modeling of DNA regeneration and priming during PCR.
• Analysis of oligonucleotide priming competition.
• Extension of the model to assess jumping PCR in standard protocols and pretreatment.

Main Results:

• Oligonucleotide priming is highly effective against regeneration from damaged DNA overlaps.
• Jumping PCR is unlikely to cause inaccurate sequencing in standard PCR protocols.
• Increased input of less-damaged DNA is theoretically achievable through primer-less cycles, but jumping PCR may occur.

Conclusions:

• Standard PCR protocols are generally robust against jumping PCR errors.
• Pretreatment methods to increase DNA fragment length require careful consideration of jumping PCR.
• Targeting conserved sequences like mtDNA or rDNA can mitigate jumping PCR during pretreatment.