Abstract
The identification of biological traces provides vital evidence in forensic reconstruction at crime scenes, especially in sexual offences. Compared with traditional presumptive or confirmatory methods, the microbiome-based method has been proven to be of great value in body fluid identification. Mixture of body fluids or tissue is common in sexual assault cases; thus, it is essential to determine the sources of mixed samples. In this study, 60 samples consisting of skin, saliva, and a mixed model of saliva deposited on facial skin were collected from a population living in Guangdong. Through 16s rDNA high-throughput sequencing, we identified the predominant microbes in saliva samples, viz., Haemophilus parainfluenzae T3T1, Neisseria flava, Gemella haemolysans, Prevotella melaninogenica, and Actinomyces odontolyticus; in skin samples, Cutibacterium acnes and Corynebacterium tuberculostearicum were the predominant species. The microbial composition of the same body fluid or tissue is similar in different individuals. However, among different body fluids or tissue, the composition of microflora in saliva is more stable than that on skin. Additionally, the microbial community in the mixed model of saliva deposited on facial skin from the same and different individuals was clearly determined by the constituent fluids or tissue, apart from the differences among the donors. Overall, the microbiome-based method may have good potential as a tool for identifying single and mixed body fluid or tissue.
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Acknowledgments
We are grateful to all volunteers who contributed samples for this study.
Funding
This project was supported by the National Natural Science Foundation of China (Grant no. 81501627 and Grant no. 81930055) and Natural Science Foundation of Guangdong Province (Grant no. 2020A1515010938).
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The project was approved by the biomedical ethical committee of the Southern Medical University (No. 2019-0011).
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Highlights
1. In this study, a mixture of saliva deposited on facial skin was used to simulate mixed models, and microbial community of mixture was clearly dominated by the constituent fluid or tissue.
2. The microbial composition of skin and saliva were significantly different, and the microbes with significant abundance differences were listed.
3. Microbiome-based method could be useful in identification of skin, saliva, and mixture of them.
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Yao, T., Han, X., Guan, T. et al. Exploration of the microbiome community for saliva, skin, and a mixture of both from a population living in Guangdong. Int J Legal Med 135, 53–62 (2021). https://doi.org/10.1007/s00414-020-02329-6
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DOI: https://doi.org/10.1007/s00414-020-02329-6