Ancient Dna: Methods And Protocols Instant

Synthetic DNA "adapters" are attached to the ends of the fragments, allowing them to bind to the sequencing platform.

Samples are ground into a fine powder and soaked in EDTA, which chelates calcium and dissolves the bone matrix. Ancient DNA: Methods and Protocols

The silica-based extraction method is the industry standard. DNA binds to silica in the presence of high concentrations of chaotic salts, allowing impurities to be washed away before the DNA is eluted into a clean buffer. 4. Library Preparation and Sequencing Synthetic DNA "adapters" are attached to the ends

Deamination (the conversion of cytosine to uracil) occurs frequently at the ends of fragments, leading to sequencing errors (C-to-T transitions). DNA binds to silica in the presence of

Software checks for high rates of C-to-T transitions at the ends of DNA fragments. If these "nicks" are present, it’s a signature of authenticity.

Proteinase K is added to break down cellular proteins and nucleases.

The exterior of the bone or tooth is usually mechanically removed (sanding) or treated with bleach and UV light to remove surface contaminants. 3. Extraction Methods