Evidence map›Paper›PMID 34593021›Full record

ArticleMicrobiome2021

Metagenomic analysis of ancient dental calculus reveals unexplored diversity of oral archaeal Methanobrevibacter.

Lena Granehäll, Kun D Huang, Adrian Tett, Paolo Manghi, Alice Paladin, Niall O'Sullivan, Omar Rota-Stabelli, Nicola Segata, Albert Zink, Frank Maixner

Open access · goldAbstract readVideo-Audio Media
In one paragraph

Article in Microbiome, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed
4.7field-weighted citation impact, top 4% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

25 citing papers in PubMed, 39 citations in OpenAlex.

  1. The Oral Microbiome of King Richard III of England.American journal of biological anthropology · 2026
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  14. Microorganisms · 2024
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  16. Journal of oral microbiology · 2024
    Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors at 4 institutions in 3 countries.

Lena Granehäll *Institute for Mummy Studies, Eurac Research, 39100, Bolzano, Italy. lena.granehaell@eurac.edu.ORCID 0000-0001-9970-4080
Kun D Huang *CIBIO Department, University of Trento, 38123, Trento, Italy. kun.huang@unitn.it.
Adrian TettCIBIO Department, University of Trento, 38123, Trento, Italy.
Paolo ManghiCIBIO Department, University of Trento, 38123, Trento, Italy.
Alice PaladinInstitute for Mummy Studies, Eurac Research, 39100, Bolzano, Italy.
Niall O'SullivanInstitute for Mummy Studies, Eurac Research, 39100, Bolzano, Italy.
Omar Rota-StabelliDepartment of Sustainable Agro-Ecosystems and Bioresources, Fondazione Edmund Mach, 38010, San Michele all'Adige, Italy.
Nicola SegataCIBIO Department, University of Trento, 38123, Trento, Italy. nicola.segata@unitn.it.
Albert ZinkInstitute for Mummy Studies, Eurac Research, 39100, Bolzano, Italy.
Frank MaixnerInstitute for Mummy Studies, Eurac Research, 39100, Bolzano, Italy. frank.maixner@eurac.edu.
Eurac Research · ITFondazione Edmund Mach · ITUniversity of Trento · ITUniversity of Vienna · AT

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundDental calculus (mineralised dental plaque) preserves many types of microfossils and biomolecules, including microbial and host DNA, and ancient calculus are thus an important source of information regarding our ancestral human oral microbiome. In this study, we taxonomically characterised the dental calculus microbiome from 20 ancient human skeletal remains originating from Trentino-South Tyrol, Italy, dating from the Neolithic (6000-3500 BCE) to the Early Middle Ages (400-1000 CE).

resultsWe found a high abundance of the archaeal genus Methanobrevibacter in the calculus. However, only a fraction of the sequences showed high similarity to Methanobrevibacter oralis, the only described Methanobrevibacter species in the human oral microbiome so far. To further investigate the diversity of this genus, we used de novo metagenome assembly to reconstruct 11 Methanobrevibacter genomes from the ancient calculus samples. Besides the presence of M. oralis in one of the samples, our phylogenetic analysis revealed two hitherto uncharacterised and unnamed oral Methanobrevibacter species that are prevalent in ancient calculus samples sampled from a broad range of geographical locations and time periods.

conclusionsWe have shown the potential of using de novo metagenomic assembly on ancient samples to explore microbial diversity and evolution. Our study suggests that there has been a possible shift in the human oral microbiome member Methanobrevibacter over the last millennia. Video abstract.

Indexed as

ArchaeaMetagenomeDental CalculusHumansMethanobrevibacterMiddle AgedPhylogenyAncient dental calculusAncient DNADe novo assemblyMetagenomicsMethanobrevibacterOral microbiome

Identifiers

PMID34593021
PMCPMC8485483
OpenAlexW3202774966

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.