The Oral Microbiome for Geographic Origin: An Italian Study

Ogbanga, Nengi, Nelson, Andrew, Ghignone, Stefano, Voyron, Samuele, Lovisolo, Flavia, Sguazzi, Giulia, Renò, Filippo, Migliario, Mario, Gino, Sarah and Procopio, Noemi (2023) The Oral Microbiome for Geographic Origin: An Italian Study. Forensic Science International: Genetics, 64. p. 102841. ISSN 1872-4973

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The human oral microbiome has primarily been studied in clinical settings and for medical purposes. More recently, oral microbial research has been incorporated into other areas of study. In forensics, research has aimed to exploit the variation in composition of the oral microbiome to answer forensic relevant topics, such as human identification and geographical provenience. Several studies have focused on the use of microbiome for continental, national, or ethnic origin evaluations. However, it is not clear how the microbiome varies between similar ethnic populations across different regions in a country. We report here a comparison of the oral microbiomes of individuals living in two regions of Italy – Lombardy and Piedmont. Oral samples were obtained by swabbing the donors’ oral mucosa, and the V4 region of the 16S rRNA gene was sequenced from the extracted microbial DNA. Additionally, we compared the oral and the skin microbiome from a subset of these individuals, to provide an understanding of which anatomical region may provide more robust results that can be useful for forensic human identification. Initial analysis of the oral microbiota revealed the presence of a core oral microbiome, consisting of nine taxa shared across all oral samples, as well as unique donor characterising taxa in 31 out of 50 samples. We also identified a trend between the abundance of Proteobacteria and Bacteroidota and the smoking habits, and of Spirochaetota and Synergistota and the age of the enrolled participants. Whilst no significant differences were observed in the oral microbial diversity of individuals from Lombardy or Piedmont, we identified two bacterial families – Corynebacteriaceae and Actinomycetaceae – that showed abundance trends between the two regions. Comparative analysis of the skin and oral microbiota showed significant differences in the alpha (p = 0.0011) and beta (Pr(>F) = 9.999e-05) diversities. Analysis of skin and oral samples from the same donor further revealed that the skin microbiome contained more unique donor characterising taxa than the oral one. Overall, this study demonstrates that whilst the oral microbiome of individuals from the same country and of similar ethnicity are largely similar, there may be donor characterising taxa that might be useful for identification purposes. Furthermore, the bacterial signatures associated with certain lifestyles could provide useful information for investigative purposes. Finally, additional studies are required, the skin microbiome may be a better discriminant for human identification than the oral one.

Item Type: Article
Additional Information: Funding Information: This research received funding from UKRI through a Future Leaders Fellowship (Noemi Procopio - MR/S032878/1 ) and was funded by the University of Eastern Piedmont ( FAR 2017 - Filippo Renò, Mario Migliario and Sarah Gino).
Uncontrolled Keywords: Forensics, Geographical origin, Human identification, Microbiome, Oral, Skin
Subjects: A300 Clinical Medicine
B100 Anatomy, Physiology and Pathology
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: Rachel Branson
Date Deposited: 22 Feb 2023 09:19
Last Modified: 22 Feb 2023 09:30

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