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Human oral metagenome

ABSTRACT: Late 19th and early 20th century dental calculus metagenomes

PROVIDER: PRJNA643812 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	JACBON01.dat.gz	Other
	JACBON01.fasta.gz	Fasta.gz
	JACBON01.master.dat	Other
	JACBOO01.dat.gz	Other

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Project description:Mineralised dental plaque (calculus) has proven to be an excellent source of ancient biomolecules. In this study we present a Mycobacterium leprae genome (6.6-fold), the causative agent of leprosy, recovered via shotgun sequencing of 16th century human dental calculus from an individual from Trondheim, Norway. Moreover, ancient mycobacterial peptides were retrieved via mass spectrometry-based proteomics, further validating the presence of the pathogen. M. leprae can readily be detected in the oral cavity and associated mucosal membranes, which likely contributed to it being incorporated into this individual’s dental calculus. This individual showed some possible, but not definitive, evidence of skeletal lesions associated with early stage leprosy. This study is the first known example of successful multi-omics retrieval of M. leprae from archaeological dental calculus. Furthermore, we offer new insights into dental calculus as an alternative sample source to bones or teeth for detecting and molecularly characterizing M. leprae in individuals from the archaeological record.

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Project description:Detailed investigation of extremely severe pathological conditions present in ancient human skeletons is important because they can illuminate the breadth of potential interactions between humans and disease etiologies in the past. Here, we applied palaeoproteomics to investigate the bacterial pathogenic factors and host defense response to an ancient human skeletal individual with severe oral pathology. This female skeleton, from the Okhotsk period (i.e., 5th–13th century) of northern Japan, poses abnormal deposition of large amounts of dental calculus and oral dysfunction due to severe periodontal disease. A shotgun mass-spectrometry analysis identified 81 human proteins and 15 bacterial proteins from her calculus. Two pathogenic or bio-invasive proteins originating from two of the three “red complex” bacteria, the core species associated with severe periodontal disease in modern humans, as well as additional two bio-invasive proteins of periodont-associated bacteria were identified. Human proteins associated with the defense response system were identified, but their proportion was mostly similar to that reported in ancient and modern human individuals with lower calculus deposition. These results suggest that the bacterial etiology was similar and the host defense response was not necessarily higher in ancient individuals with abnormal deposition of large amounts of dental calculus.

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