Analysis of shed epidermal cells from touch DNA samples

What is it about?

Touch DNA samples are prevalent in forensic DNA casework. In this study we show that extracellular or 'cell-free' DNA can be a significant portion of the total DNA recovered from touch samples and that epidermal cells can be recovered even if no DNA is detected from the sample.

Featured Image

Why is it important?

'Touch' or trace DNA can be one of the most challenging forms of biological evidence. Understanding the biochemical and cellular context of amplifiable DNA in touch samples can lead to improved methods for DNA collection, preservation, and analysis methods. Additionally this work may lead to new non-genetic signature systems based on the characteristics of intact epidermal cells.