scholarly journals The Human Oral Microbiome in Health and Disease: From Sequences to Ecosystems

2020 ◽  
Vol 8 (2) ◽  
pp. 308 ◽  
Author(s):  
Jesse R. Willis ◽  
Toni Gabaldón
Keyword(s):  
Oral Cavity ◽  
Ribosomal Rna ◽  
Oral Microbiome ◽  
Health Conditions ◽  
Future Prospects ◽  
Health And Disease ◽  
Oral Microbes ◽  
Recent Sequencing ◽  
Intense Research

The human oral cavity is home to an abundant and diverse microbial community (i.e., the oral microbiome), whose composition and roles in health and disease have been the focus of intense research in recent years. Thanks to developments in sequencing-based approaches, such as 16S ribosomal RNA metabarcoding, whole metagenome shotgun sequencing, or meta-transcriptomics, we now can efficiently explore the diversity and roles of oral microbes, even if unculturable. Recent sequencing-based studies have charted oral ecosystems and how they change due to lifestyle or disease conditions. As studies progress, there is increasing evidence of an important role of the oral microbiome in diverse health conditions, which are not limited to diseases of the oral cavity. This, in turn, opens new avenues for microbiome-based diagnostics and therapeutics that benefit from the easy accessibility of the oral cavity for microbiome monitoring and manipulation. Yet, many challenges remain ahead. In this review, we survey the main sequencing-based methodologies that are currently used to explore the oral microbiome and highlight major findings enabled by these approaches. Finally, we discuss future prospects in the field.

scholarly journals Role of Oral Microbiome Signatures in Diagnosis and Prognosis of Oral Cancer

2019 ◽  
Vol 18 ◽  
pp. 153303381986735 ◽  
Author(s):  
Indranil Chattopadhyay ◽  
Mukesh Verma ◽  
Madhusmita Panda
Keyword(s):  
Oral Cancer ◽  
Epithelial Cells ◽  
Oral Cavity ◽  
Bacterial Species ◽  
Treatment Strategies ◽  
Genetic Alterations ◽  
Oral Microbiome ◽  
Oral Carcinogenesis ◽  
Early Diagnostic

Despite advancement in cancer treatment, oral cancer has a poor prognosis and is often detected at late stage. To overcome these challenges, investigators should search for early diagnostic and prognostic biomarkers. More than 700 bacterial species reside in the oral cavity. The oral microbiome population varies by saliva and different habitats of oral cavity. Tobacco, alcohol, and betel nut, which are causative factors of oral cancer, may alter the oral microbiome composition. Both pathogenic and commensal strains of bacteria have significantly contributed to oral cancer. Numerous bacterial species in the oral cavity are involved in chronic inflammation that lead to development of oral carcinogenesis. Bacterial products and its metabolic by-products may induce permanent genetic alterations in epithelial cells of the host that drive proliferation and/or survival of epithelial cells. Porphyromonas gingivalis and Fusobacterium nucleatum induce production of inflammatory cytokines, cell proliferation, and inhibition of apoptosis, cellular invasion, and migration thorough host cell genomic alterations. Recent advancement in metagenomic technologies may be useful in identifying oral cancer–related microbiome, their genomes, virulence properties, and their interaction with host immunity. It is very important to address which bacterial species is responsible for driving oral carcinogenesis. Alteration in the oral commensal microbial communities have potential application as a diagnostic tool to predict oral squamous cell carcinoma. Clinicians should be aware that the protective properties of the resident microflora are beneficial to define treatment strategies. To develop highly precise and effective therapeutic approaches, identification of specific oral microbiomes may be required. In this review, we narrate the role of microbiome in the progression of oral cancer and its role as an early diagnostic and prognostic biomarker for oral cancer.

scholarly journals Sex Steroid Hormones as a Balancing Factor in Oral Host Microbiome Interactions

2021 ◽  
Vol 11 ◽  
Author(s):  
Pilar Cornejo Ulloa ◽  
Bastiaan P. Krom ◽  
Monique H. van der Veen
Keyword(s):  
Oral Cavity ◽  
Steroid Hormones ◽  
Sex Steroid Hormones ◽  
Oral Microbiome ◽  
Host Cells ◽  
Sex Steroid ◽  
Hormonal Changes ◽  
Host Microbe Interactions ◽  
Oral Microorganisms

Sex steroid hormones (SSH) are cholesterol-derived molecules. They are secreted into saliva and enter the oral cavity, triggering physiological responses from oral tissues, with possible clinical implications, such as gingival inflammation and bleeding. SSH and hormonal changes affect not only oral host cells but also oral microorganisms.Historically, most research has focused on the effect of hormonal changes on specific bacteria and yeasts. Recently a broader effect of SSH on oral microorganisms was suggested. In order to assess the role of SSH in host-microbe interactions in the oral cavity, this review focuses on how and up to what extent SSH can influence the composition and behavior of the oral microbiome. The available literature was reviewed and a comprehensive hypothesis about the role of SSH in host-microbiome interactions is presented. The limited research available indicates that SSH may influence the balance between the host and its microbes in the oral cavity.

scholarly journals Genome Comparison of Actinomyces Naeslundii with known Probiotics

2020 ◽  
Vol 18 (2) ◽  
Author(s):  
Noor Afifah Hanin Mohamad ◽  
Mohd Hafiz Arzmi ◽  
Noratikah Othman
Keyword(s):  
Oral Cavity ◽  
Phylogenetic Tree ◽  
Evolutionary Relationship ◽  
Oral Microbiome ◽  
Genome Comparison ◽  
Probiotic Properties ◽  
High Similarity ◽  
Bifidobacterium Species ◽  
Actinomyces Naeslundii

Introduction: Actinomyces naeslundii  is an oral microbiome that has been suggested to involve in actinomycosis particularly in immunocompromised patients. However, studies have also shown that the bacterium can inhibit the colonisation of Candida albicans and cariogenic bacterium, Streptococcus mutans. Even though various studies have been conducted to characterise  A. naeslundii, however, the role of the bacterium in the oral cavity either to induce pathogenicity or to improve oral health remain unclear. The objective of this study is to determine the role of A. naeslundii  in the oral cavity using bioinformatic tools with the hypothesis that A. naeslundii  possesses genome similarity to oral probiotics. Materials and method: The study was conducted by data mining of the genomic sequences of A. naeslundii  NCTC10301 from GenBank. Following that, genomic comparison was performed with 25 species of well-known probiotics. MAUVE version 2.3.1 was used to find similarities between  A. naeslundii with the known probiotics through identification of potential relevance probiotic properties in A. naeslundii. Phylogenetic tree was constructed using PHYLIP package to identify evolutionary relationship of A. naeslundii with the known probiotics. The 16s rRNA sequences of A. naeslundii and known probiotics were harvested from GenBank using BLAST. Finally, the functions of all A. naeslundii  genes that shared similarity with known probiotics were identified using INTERPRO. Result: Genome comparison analysis of the present study showed that A. naeslundii  genome exhibited high similarity to Bifidobacterium species such as B. animalis subsp. lactis, B. bifidum, B. longum and B. breve. In addition, phylogenetic tree analysis showed that  Bacillus  species, B. subtilis  and  B. cereus , appeared to clade together with A. naeslundii, with bootstrap value of 98%. Conclusion: A. naeslundii had high similarity with probiotic Bifidobacterium species thus supported the hypothesis of the present study that A. naeslundii possesses genome similarity to oral probiotic.

scholarly journals Role of salivary glycopatterns for oral microbiota associated with gastric cancer

2021 ◽  
Author(s):  
Jian Shu ◽  
Hanjie Yu ◽  
Xiameng Ren ◽  
Yan Wang ◽  
Kun Zhang ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Oral Cavity ◽  
Healthy Volunteers ◽  
Human Health ◽  
Oral Microbiome ◽  
Oral Microbiota ◽  
Oral Cells

Abstract Microbiota in the oral cavity plays an important role in maintaining human health. Our previous studies have revealed significant alterations of salivary glycopatterns in gastric cancer (GC) patients, but it is unclear whether these altered salivary glycopatterns can cause the dysbiosis of oral microbiota. In this study, the oral microbiome of healthy volunteers and GC patients were detected. The neoglycoproteins were then synthesized according to the altered glycopatterns in GC patients and used to explore the effects of specific glycopattern against oral microbiota. The results showed that the fucose-neoglycoproteins could reduce the adhesion and toxicity of A. segnis to oral cells, change the glycan structures of lipopolysaccharide, and enhance the immunogenicity of A. segnis. This study revealed that the changes of salivary glycopatterns in GC patients might contribute to the dysbiosis of oral microbiota, had important implications in developing new carbohydrate drugs to maintain a balanced microbiota in the oral.

scholarly journals The Human Oral Microbiome

2010 ◽  
Vol 192 (19) ◽  
pp. 5002-5017 ◽  
Author(s):  
Floyd E. Dewhirst ◽  
Tuste Chen ◽  
Jacques Izard ◽  
Bruce J. Paster ◽  
Anne C. R. Tanner ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Species Level ◽  
Oral Microbiome ◽  
Rrna Gene ◽  
Oral Microbiota ◽  
16S Rrna Gene Sequences ◽  
Culture Independent ◽  
Health And Disease

ABSTRACT The human oral cavity contains a number of different habitats, including the teeth, gingival sulcus, tongue, cheeks, hard and soft palates, and tonsils, which are colonized by bacteria. The oral microbiome is comprised of over 600 prevalent taxa at the species level, with distinct subsets predominating at different habitats. The oral microbiome has been extensively characterized by cultivation and culture-independent molecular methods such as 16S rRNA cloning. Unfortunately, the vast majority of unnamed oral taxa are referenced by clone numbers or 16S rRNA GenBank accession numbers, often without taxonomic anchors. The first aim of this research was to collect 16S rRNA gene sequences into a curated phylogeny-based database, the Human Oral Microbiome Database (HOMD), and make it web accessible (www.homd.org ). The HOMD includes 619 taxa in 13 phyla, as follows: Actinobacteria, Bacteroidetes, Chlamydiae, Chloroflexi, Euryarchaeota, Firmicutes, Fusobacteria, Proteobacteria, Spirochaetes, SR1, Synergistetes, Tenericutes, and TM7. The second aim was to analyze 36,043 16S rRNA gene clones isolated from studies of the oral microbiota to determine the relative abundance of taxa and identify novel candidate taxa. The analysis identified 1,179 taxa, of which 24% were named, 8% were cultivated but unnamed, and 68% were uncultivated phylotypes. Upon validation, 434 novel, nonsingleton taxa will be added to the HOMD. The number of taxa needed to account for 90%, 95%, or 99% of the clones examined is 259, 413, and 875, respectively. The HOMD is the first curated description of a human-associated microbiome and provides tools for use in understanding the role of the microbiome in health and disease.

scholarly journals The Promising Role of Antioxidant Phytochemicals in the Prevention and Treatment of Periodontal Disease via the Inhibition of Oxidative Stress Pathways: Updated Insights

Antioxidants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1211
Author(s):  
Thi Thuy Tien Vo ◽  
Pei-Ming Chu ◽  
Vo Phuoc Tuan ◽  
Joyce Si-Liang Te ◽  
I-Ta Lee
Keyword(s):  
Oxidative Stress ◽  
Oral Cavity ◽  
Periodontal Disease ◽  
Inflammatory Disease ◽  
Therapeutic Agents ◽  
Future Prospects ◽  
Pharmacological Activities ◽  
Current Review ◽  
Prevention And Treatment

There is growing evidence on the involvement of oxidative stress, which is simply described as the imbalance between oxidants and antioxidants in favor of the former, in the development of periodontal disease that is the most common inflammatory disease in the oral cavity. Thus, the potential of antioxidant phytochemicals as adjunctively preventive and therapeutic agents against the initiation and progression of periodontal disease is a topic of great interest. The current review firstly aims to provide updated insights about the immuno-inflammatory pathway regulated by oxidative stress in periodontal pathology. Then, this work further presents the systemic knowledge of antioxidant phytochemicals, particularly the pharmacological activities, which can be utilized in the prevention and treatment of periodontal disease. Additionally, the challenges and future prospects regarding such a scope are figured out.

scholarly journals The Oral Microbiome in Pediatric IBD: A Source of Pathobionts or Biomarkers?

2021 ◽  
Vol 8 ◽  
Author(s):  
Khalid Elmaghrawy ◽  
Séamus Hussey ◽  
Gary P. Moran
Keyword(s):  
Potential Role ◽  
Inflammatory Responses ◽  
Current Knowledge ◽  
Oral Bacteria ◽  
Oral Microbiome ◽  
Gi Tract ◽  
Clinical Indicator ◽  
Microbial Dysbiosis ◽  
Oral Microbes

The oral cavity is continuous with the gastrointestinal tract and in children, oral health may be closely linked with the overall health of the GI tract. In the case of pediatric Crohn's disease (CD), oral manifestations are an important clinical indicator of intestinal disease. Recent studies of the microbiome in IBD suggest that translocation of oral microbes to the gut may be a common feature of the microbial dysbiosis which is a signature of both CD and ulcerative colitis (UC). Murine studies suggest that translocation of oral bacteria and yeasts to the lower GI tract may trigger inflammation in susceptible hosts, providing a mechanistic link to the development of IBD. Conversely, some studies have shown that dysbiosis of the oral microbiome may occur, possibly as a result of inflammatory responses and could represent a useful source of biomarkers of GI health. This review summarizes our current knowledge of the oral microbiome in IBD and presents current hypotheses on the potential role of this community in the pathogenesis of these diseases.

scholarly journals Relationships Between Oral Microecosystem and Respiratory Diseases

2022 ◽  
Vol 8 ◽  
Author(s):  
Jiajia Dong ◽  
Wei Li ◽  
Qi Wang ◽  
Jiahao Chen ◽  
Yue Zu ◽  
...  
Keyword(s):  
Oral Health ◽  
Respiratory Infection ◽  
Respiratory Diseases ◽  
Oral Microbiome ◽  
Chronic Obstructive ◽  
Oral Microbiota ◽  
Respiratory Pathogens ◽  
Oral Diseases ◽  
Oral Microbes

Oral microecosystem is a very complicated ecosystem that is located in the mouth and comprises oral microbiome, diverse anatomic structures of oral cavity, saliva and interactions between oral microbiota and between oral microbiota and the host. More and more evidence from studies of epidemiology, microbiology and molecular biology is establishing a significant link between oral microecosystem and respiratory diseases. Microbiota settling down in oral microecosystem is known as the main source of lung microbiome and has been associated with the occurrence and development of respiratory diseases like pneumonia, chronic obstructive pulmonary disease, lung cancer, cystic fibrosis lung disease and asthma. In fact, it is not only indigenous oral microbes promote or directly cause respiratory infection and inflammation when inhaled into the lower respiratory tract, but also internal environment of oral microecosystem serves as a reservoir for opportunistic respiratory pathogens. Moreover, poor oral health and oral diseases caused by oral microecological dysbiosis (especially periodontal disease) are related with risk of multiple respiratory diseases. Here, we review the research status on the respiratory diseases related with oral microecosystem. Potential mechanisms on how respiratory pathogens colonize oral microecosystem and the role of indigenous oral microbes in pathogenesis of respiratory diseases are also summarized and analyzed. Given the importance of oral plaque control and oral health interventions in controlling or preventing respiratory infection and diseases, we also summarize the oral health management measures and attentions, not only for populations susceptible to respiratory infection like the elderly and hospitalized patients, but also for dentist or oral hygienists who undertake oral health care. In conclusion, the relationship between respiratory diseases and oral microecosystem has been established and supported by growing body of literature. However, etiological evidence on the role of oral microecosystem in the development of respiratory diseases is still insufficient. Further detailed studies focusing on specific mechanisms on how oral microecosystem participate in the pathogenesis of respiratory diseases could be helpful to prevent and treat respiratory diseases.

scholarly journals Oral Microbes, Biofilms and Their Role in Periodontal and Peri-Implant Diseases

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1802 ◽  
Author(s):  
Lasserre Frédéric ◽  
Brecx Michel ◽  
Toma Selena
Keyword(s):  
Oral Health ◽  
Current Treatment ◽  
Treatment Principles ◽  
General Overview ◽  
The Past ◽  
Microbial Biofilms ◽  
Health And Disease ◽  
Oral Microbes ◽  
New Strategies

Despite many discoveries over the past 20 years regarding the etio-pathogenesis of periodontal and peri-implant diseases, as well as significant advances in our understanding of microbial biofilms, the incidence of these pathologies still continues to rise. This review presents a general overview of the main protagonists and phenomena involved in oral health and disease. A special emphasis on the role of certain keystone pathogens in periodontitis and peri-implantitis is underlined. Their capacity to bring a dysregulation of the homeostasis with their host and the microbial biofilm lifestyle are also discussed. Finally, the current treatment principles of periodontitis and peri-implantitis are presented and their limits exposed. This leads to realize that new strategies must be developed and studied to overcome the shortcomings of existing approaches.

Sign in / Sign up

Export Citation Format

Share Document