The system is fully automatable, provides operator-independent results, and
allows combining tissue identification with profiling in a single procedure. The assay was tested on 50
DNA samples from blood, saliva, semen, and skin epidermis, and the source tissue was successfully
identified in all cases. Detection of semen and DNA profiling were combined into one assay and the
ability to detect mixtures of semen and saliva in various ratios was demonstrated. The assay correctly
detected semen in all samples where it was present, and the calculated percentage of semen was
comparable to the fraction of semen in the samples. The results demonstrate that methylation-based
tissue identification is more than a proof-of-concept. The methodology holds promise as another viable
forensic DNA analysis tool for characterization of biological materials.
The system is fully automatable, provides operator-independent results, andallows combining tissue identification with profiling in a single procedure. The assay was tested on 50DNA samples from blood, saliva, semen, and skin epidermis, and the source tissue was successfullyidentified in all cases. Detection of semen and DNA profiling were combined into one assay and theability to detect mixtures of semen and saliva in various ratios was demonstrated. The assay correctlydetected semen in all samples where it was present, and the calculated percentage of semen wascomparable to the fraction of semen in the samples. The results demonstrate that methylation-basedtissue identification is more than a proof-of-concept. The methodology holds promise as another viableforensic DNA analysis tool for characterization of biological materials.
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