Preamplification procedure for the analysis of ancient DNA samples

Area of Science:

• Paleogenetics
• Molecular Biology
• Archaeology

Background:

• Low endogenous DNA quantity is a major limitation in ancient DNA studies.
• DNA extraction from human skeletal remains from Byzantine and medieval Greek sites was performed.
• Quantitative polymerase chain reaction (qPCR) was used to assess DNA content and inhibitors.

Purpose of the Study:

• To evaluate the effectiveness of a preamplification strategy for improving ancient DNA analysis.
• To compare amplification success rates between preamplified and non-preamplified ancient DNA samples.
• To enhance the sensitivity of qPCR for detecting low-yield nuclear DNA targets.

Main Methods:

• DNA extraction from nine human skeletal remains.
• Real-time quantitative polymerase chain reaction (qPCR) for DNA quantification and inhibitor detection.
• Application of TaqMan PreAmp Master Mix for preamplification of nuclear targets.
• Amplification of nuclear targets (amelogenin, CFTR gene polymorphism M470V).

Main Results:

• Mitochondrial DNA was detected in all samples.
• Nuclear DNA targets were successfully amplified in only one non-preamplified sample.
• Preliminary data suggest improved sensitivity with the TaqMan PreAmp procedure.
• The preamplification strategy showed potential for increasing amplification success rates.

Conclusions:

• Ancient DNA studies are often limited by low endogenous DNA amounts.
• A preamplification strategy using TaqMan PreAmp Master Mix may enhance qPCR sensitivity for nuclear DNA.
• This approach shows promise for improving the analysis of degraded ancient DNA samples.
• Further research is needed to fully validate the efficacy of this preamplification technique.