A method for the temperature-controlled extraction of DNA from ancient bones

Area of Science:

• Paleogenomics
• Molecular Biology
• Ancient DNA Research

Background:

• Contamination from exogenous DNA is a major obstacle in ancient DNA (aDNA) sequencing.
• Obtaining high-quality genome-wide data from ancient skeletal remains is crucial for evolutionary and demographic studies.
• Existing decontamination methods can be harsh and damage fragile aDNA.

Purpose of the Study:

• To develop and evaluate a new DNA extraction technique for ancient skeletal remains.
• To improve the enrichment of endogenous DNA while minimizing exogenous contaminants.
• To offer a gentler alternative to harsh decontamination protocols.

Main Methods:

• A novel DNA extraction method utilizing sequential temperature-controlled release of DNA.
• Fractionation of DNA into multiple aliquots using sodium phosphate buffer.
• Comparative analysis of the new method against standard extraction and hypochlorite treatment.

Main Results:

• The new method achieved 1.6- to 32-fold enrichment of endogenous DNA across three ancient bone samples.
• It demonstrated superior performance compared to previous decontamination techniques, including hypochlorite treatment.
• Hypochlorite treatment led to significant DNA degradation in poorly preserved samples.

Conclusions:

• This sequential temperature-controlled DNA extraction method effectively enriches endogenous DNA from ancient skeletal remains.
• The technique offers a valuable advancement in ancient DNA research by reducing contamination and preserving DNA integrity.
• It expands the toolkit for researchers working with challenging ancient DNA samples.