Microbiome 16S rRNA gene amplicon data from human body sites

Recent advances in next-generation sequencing have opened up new possibilities for utilizing the human microbiome in various fields, including forensics. Researchers have capitalized on the site-specific microbial communities found in different parts of the body to identify body fluids from biological evidence. Despite promising results, microbiome-based methods have not been integrated into forensic practice due to the lack of standardized protocols and systematic testing of methods on forensically relevant samples. Our study addresses critical decisions in establishing these protocols, focusing on bioinformatics choices and the use of machine learning to present microbiome results in case reports for forensically relevant and challenging samples. In our study, we propose using Operational Taxonomic Units (OTUs) for read data processing and generating heterogeneous training datasets for training a random forest classifier. We incorporated six forensically relevant classes: saliva, semen, hand skin, penile skin, urine, and vaginal/menstrual fluid and our classifier achieved a high weighted average F1 score of 0.89. Systematic testing on mock forensic samples including mixed-source samples and underwear revealed reliable detection of at least one component of the mixture and the identification of vaginal fluid from underwear substrates. Additionally, when investigating the sexually shared microbiome (sexome) of heterosexual couples, our classifier could potentially infer the nature of sexual activity. We therefore highlight the value of the sexome for assessing the nature of sexual activities in forensic investigations, while delineating areas that warrant further research.