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  • 1
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    Frontiers Media SA
    Publication Date: 2023-12-20
    Description: The oral cavity harbors an immense diversity of microorganisms, including bacteria, fungi, archaea, protozoa and viruses. At health, oral microbial community is thought to be in a state of homeostasis, even after numerous perturbations (e.g., toothbrushing, food intake) a day. The breach in this homeostasis can occur for instance if the perturbations become too excessive (e.g., frequent carbohydrate intake leading to acidification of the community) or the host is compromised (e.g., inadequate immune response resulting in persistent inflammation of periodontal tissue). Aggressive antimicrobial therapy (e.g., antibiotics in case of periodontal disease or preventive antibiotic therapy before and after dental extractions) is commonly applied with all the negative consequences of this approach. So far little is known on the interplay between the environmental, host and microbial factors in maintaining an ecological balance. What are the prerequisites for a healthy oral ecosystem? Can we restore an unbalanced oral microbiome? How stable is the oral microbiome through time and how robust it is to external perturbations? Gaining new insights in the ecological factors sustaining oral health will lead to conceptually new therapies and preventive programs. Recent advances in high throughput technologies have brought microbiology as a science to a new era, allowing an open-ended approach instead of focusing on few opportunistic pathogens. With this topic we would like to integrate the current high-throughput ‘omics’ tools such as metagenomics, metatranscriptomics, metaproteomics or metabolomics with biochemical, physiological, genetic or clinical parameters within the oral microbial ecosystem. We aim to address questions underlying the regulation of the ecological balance in the oral cavity by including the following areas: • Ecology of oral microbiome at health • Ecology of oral microbiome under oral diseases • Ecology of oral microbiome during non-oral diseases • Shifts in the oral microbiome by therapeutic approaches (e.g., antimicrobials, replacement therapy, pre- and probiotics) • Modeling of oral ecological shifts (e.g., animal models, in vitro microcosm models) • Complex inter- and intra-kingdom interactions (e.g., bacterial-fungal-host) related to oral ecology • Environmental (e.g., diet, tobacco), host-related (e.g., immune response, saliva composition and flow) and biotic (e.g., bacterial competition) factors influencing oral ecology • Geographic variation in oral microbial ecology and diversity
    Keywords: Q1-390 ; RC109-216 ; Oral ecology ; Quorum Sensing ; Immune System ; metatranscriptomics ; Biofilm ; horizontal gene transfer ; Fungal bacterial interactions ; Dental Plaque ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GP Research & information: general
    Language: English
    Format: image/jpeg
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  • 2
    Publication Date: 2015-07-03
    Description: Background: Recognition of microorganisms by antibodies is a vital component of the human immune response. However, there is currently very limited understanding of immune recognition of 50 % of the human microbiome which is made up of as yet un-culturable bacteria. We have combined the use of flow cytometry and pyrosequencing to describe the microbial composition of human samples, and its interaction with the immune system. Results: We show the power of the technique in human faecal, saliva, oral biofilm and breast milk samples, labeled with fluorescent anti-IgG or anti-IgA antibodies. Using Fluorescence-Activated Cell Sorting (FACS), bacterial cells were separated depending on whether they are coated with IgA or IgG antibodies. Each bacterial population was PCR-amplified and pyrosequenced, characterizing the microorganisms which evade the immune system and those which were recognized by each immunoglobulin. Conclusions: The application of the technique to healthy and diseased individuals may unravel the contribution of the immune response to microbial infections and polymicrobial diseases.
    Electronic ISSN: 1471-2180
    Topics: Biology
    Published by BioMed Central
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  • 3
    Publication Date: 2014-04-28
    Description: Background: Micro-organisms inhabiting teeth surfaces grow on biofilms where a specific and complex succession of bacteria has been described by co-aggregation tests and DNA-based studies. Although the composition of oral biofilms is well established, the active portion of the bacterial community and the patterns of gene expression in vivo have not been studied. Results: Using RNA-sequencing technologies, we present the first metatranscriptomic study of human dental plaque, performed by two different approaches: (1) A short-reads, high-coverage approach by Illumina sequencing to characterize the gene activity repertoire of the microbial community during biofilm development; (2) A long-reads, lower-coverage approach by pyrosequencing to determine the taxonomic identity of the active microbiome before and after a meal ingestion. The high-coverage approach allowed us to analyze over 398 million reads, revealing that microbial communities are individual-specific and no bacterial species was detected as key player at any time during biofilm formation. We could identify some gene expression patterns characteristic for early and mature oral biofilms. The transcriptomic profile of several adhesion genes was confirmed through qPCR by measuring expression of fimbriae-associated genes. In addition to the specific set of gene functions overexpressed in early and mature oral biofilms, as detected through the short-reads dataset, the long-reads approach detected specific changes when comparing the metatranscriptome of the same individual before and after a meal, which can narrow down the list of organisms responsible for acid production and therefore potentially involved in dental caries. Conclusions: The bacteria changing activity during biofilm formation and after meal ingestion were person-specific. Interestingly, some individuals showed extreme homeostasis with virtually no changes in the active bacterial population after food ingestion, suggesting the presence of a microbial community which could be associated to dental health.
    Electronic ISSN: 1471-2164
    Topics: Biology
    Published by BioMed Central
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  • 4
    Publication Date: 2018-06-14
    Description: Oral microbiome development during childhood: an ecological succession influenced by postnatal factors and associated with tooth decay Oral microbiome development during childhood: an ecological succession influenced by postnatal factors and associated with tooth decay, Published online: 13 June 2018; doi:10.1038/s41396-018-0204-z Oral microbiome development during childhood: an ecological succession influenced by postnatal factors and associated with tooth decay
    Print ISSN: 1751-7362
    Electronic ISSN: 1751-7370
    Topics: Biology
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  • 5
    Publication Date: 2018
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 6
    Publication Date: 2018-11-09
    Description: Author Correction: Multiple Approaches Detect the Presence of Fungi in Human Breastmilk Samples from Healthy Mothers Author Correction: Multiple Approaches Detect the Presence of Fungi in Human Breastmilk Samples from Healthy Mothers, Published online: 09 November 2018; doi:10.1038/s41598-018-35165-1 Author Correction: Multiple Approaches Detect the Presence of Fungi in Human Breastmilk Samples from Healthy Mothers
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 7
    Publication Date: 2017-10-13
    Description: Multiple Approaches Detect the Presence of Fungi in Human Breastmilk Samples from Healthy Mothers Scientific Reports, Published online: 12 October 2017; doi:10.1038/s41598-017-13270-x
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 8
    Publication Date: 2014-01-01
    Electronic ISSN: 2296-7745
    Topics: Biology
    Published by Frontiers Media
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillan Magazines Ltd.
    Nature 403 (2000), S. 501-501 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Krakauer and Mira reply Many of the issues raised by Perez et al. concern molecular mechanism rather than evolutionary function. Thus ‘cause’ does not carry the same meaning in evolution as in physiology. The evolutionary cause or function of sexual ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillan Magazines Ltd.
    Nature 400 (1999), S. 125-126 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In birds and mammals, most of the female germ cells are destroyed before fertilization in a process known as atresia, reducing the population of cells to a small fraction of that present in early fetal life. We suggest that this death of germ cells can be interpreted as a developmental solution ...
    Type of Medium: Electronic Resource
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