The feasibility of establishing parentage through hair samples hinges on the presence of nuclear DNA. While hair shafts primarily contain mitochondrial DNA, which can only trace maternal lineage, a hair sample with an attached follicle (the root) offers a greater chance of containing nucleated cells. These cells possess nuclear DNA, the genetic material required for accurate identification and comparison necessary for paternity testing. A plucked hair, as opposed to a naturally shed hair, is more likely to include this vital follicle material.
The potential of using hair in paternity determination offers benefits, particularly in situations where conventional DNA sources, like buccal swabs or blood samples, are unavailable or difficult to obtain. This method can be crucial in forensic investigations, historical analyses, or cases involving deceased individuals. However, the reliability of this process is significantly affected by the condition of the hair sample and the degradation of the DNA it contains. Historical attempts to extract and analyze DNA from hair have faced challenges due to DNA fragmentation and contamination.
