Metagenomic analyses of bacteria on human hairs: a qualitative assessment for applications in forensic science
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Background: Mammalian hairs are one of the most ubiquitous types of trace evidence collected in the course of forensic investigations. However, hairs that are naturally shed or that lack roots are problematic substrates for DNA profiling; these hair types often contain insufficient nuclear DNA to yield short tandem repeat (STR) profiles. Whilst there have been a number of initial investigations evaluating the value of metagenomics analyses for forensic applications (e.g. examination of computer keyboards), there have been no metagenomic evaluations of human hairs—a substrate commonly encountered during forensic practice. This present study attempts to address thisforensic capability gap, by conducting a qualitative assessment into the applicability of metagenomic analyses of human scalp and pubic hair.Results: Forty-two DNA extracts obtained from human scalp and pubic hairs generated a total of 79,766 reads, yielding 39,814 reads post control and abundance filtering. The results revealed the presence of unique combinations of microbial taxa that can enable discrimination between individuals and signature taxa indigenous to female pubic hairs. Microbial data from a single co-habiting couple added an extra dimension to the study by suggesting that metagenomic analyses might be of evidentiary value in sexual assault cases when other associative evidence is not present.Conclusions: Of all the data generated in this study, the next-generation sequencing (NGS) data generated from pubic hair held the most potential for forensic applications. Metagenomic analyses of human hairs may provide independent data to augment other forensic results and possibly provide association between victims of sexual assault and offender when other associative evidence is absent. Based on results garnered in the present study, we believe that with further development, bacterial profiling of hair will become a valuable addition to the forensic toolkit.
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Tridico, S.; Murray, D.; Bunce, Michael; Kirkbride, K. (2017)© 2017 John Wiley & Sons Ltd. All rights reserved. Human hair is one of the most ubiquitous types of biological trace evidence encountered in forensic investigations. However, despite their prevalence, there is a paucity ...
Interpreting biological degradative processes acting on mammalian hair in the living and the dead: which ones are taphonomic?Tridico, S.; Koch, S.; Michaud, A.; Thomson, G.; Kirkbride, P.; Bunce, Michael (2014)Although the taphonomic (post-mortem) degradation processes relevant to teeth and bones have been well described, those taking place with regards to mammalian hairs have not been characterized to the same extent. This ...
Interpreting biological degradative processes acting on mammalian hair in the living and the dead: which ones are taphonomic?Tridico, S.; Koch, S.; Michaud, A.; Thomson, G.; Kirkbride, K.; Bunce, Michael (2014)Although the taphonomic (post-mortem) degradation processes relevant to teeth and bones have been well described, those taking place with regards to mammalian hairs have not been characterized to the same extent. This ...