Possibility of paternity testing using RFLP analysis on a very small amount of material.

Paternity testing by DNA analysis was carried out using dental pulpal and chorionic villous tissue from two children respectively, and fresh blood samples obtained from the alleged parents. DNA was extracted spectroscopically from the pulp of an upper wisdom tooth (16 micrograms) and the chorionic villi (53 micrograms). The RFLP method was used for DNA analysis of the parent-child relationships because both of the DNAs extracted had a high molecular weight. Distinct bands were detected with 32P-labelled multi-locus (Myo) and single locus (pYNH24) DNA probes. In the case of the dental specimen all of the bands of the child's DNA were found to be derived from either of the alleged parents, demonstrating a consistent parent-child relationship (the probability of established paternity was 99.86%) whilst in the case of the villous specimen the father-child relationship was denied. This procedure can provide much information using very little material for analysis but where the samples are in a good condition.