The Affecting Factors of Touch DNA

Abstract

Touch DNA, trace DNA or Low copy number has become an area of interest in recent years because of its importance when other type of biological evidences might not be available. However, minimal efforts have been devoted to develop the collection methods of touch DNA, and the success of DNA typing depends on the availability of existing DNA templates. In most cases DNA leaves sufficient quantity and quality of genomic DNA to produce a DNA profile. However, some variables affect the success of obtaining a good quality DNA profile. Such variables include shedder status, surface type, pressure of contact; other variables include the methods of DNA collection and the methods of DNA extraction.