Periodontal diseases are one of the most common bacterial infections of humans and impose a significant burden on the health care system. Recent developments in molecular based bacterial detection technologies have identified a number of previously unrecognized or under-appreciated organisms as associated with periodontal lesions. Here we propose to challenge an existing, well-defined model early-stage oral microbial consortium, consisting of Porphyromonas gingivalis, Fusobacterium nucleatum, and Streptococcus gordonii, with a newly recognized gram positive organism, Filifactor alocis, that has been strongly implicated as an important constituent of pathogenic biofilms associated with periodontal disease. As periodontal diseases are polymicrobial infections, in Aims 1 and 2 we shall characterize relative abundance changes in the transcriptomes and proteomes of F. alocis that occur as a result of close contact with the other organisms of differing pathogenic potential listed above. The transcriptome measurements will be time-coursed over the interval most likely to be informative of early stage adaptation to the community environment, from t=0 to t=12 hours, while proteomes will be sampled at 18 hours and other selected time points for non-targeted and targeted analyses.
In Aim 3 mutants of F. alocis based on differential expression data will be generated and tested for community development by confocal microscopy and quantitative image analysis. As bacteria adapt to a community environment on a global scale, the systems based approaches of RNA-Seq and proteomics are essential for a full understanding of the differential expression patterns that characterize adaptation to polymicrobial communities. Interrogation of these datasets will provide novel insights into the pathoecology of F. alocis in the context of interactions with other organisms that are well-characterized. Overall, this project involves a comprehensive approach to address the pathoecology this newly recognized pathogen. Ultimately, the knowledge gained could be translated into novel diagnostic, therapeutic or preventive strategies for periodontal diseases.

Public Health Relevance

Periodontal diseases afflict millions of Americans, and new molecular techniques have identified a variety of bacteria associated with the disease, many of which have only recently been grown in the laboratory. In this project we will challenge an existing microbial community model that is applicable to the early stages of oral biofilm formation with Filifactor alocis. F. alocis is a recently cultivated organism that shows evidence o significant pathogenic potential with respect to periodontal disease. The information to be gathered could result in a re-evaluation of the causes of periodontal disease, and ultimately be used to identify targets for novel therapeutic agents or diagnostic tests.

Agency
National Institute of Health (NIH)
Institute
National Institute of Dental & Craniofacial Research (NIDCR)
Type
High Priority, Short Term Project Award (R56)
Project #
2R56DE014372-10
Application #
9055003
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Lunsford, Dwayne
Project Start
2002-01-01
Project End
2017-05-31
Budget Start
2015-06-01
Budget End
2017-05-31
Support Year
10
Fiscal Year
2015
Total Cost
Indirect Cost
Name
University of Washington
Department
Engineering (All Types)
Type
Biomed Engr/Col Engr/Engr Sta
DUNS #
605799469
City
Seattle
State
WA
Country
United States
Zip Code
98195
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Hendrickson, Erik L; Beck, David A C; Miller, Daniel P et al. (2017) Insights into Dynamic Polymicrobial Synergy Revealed by Time-Coursed RNA-Seq. Front Microbiol 8:261
Hutcherson, J A; Gogeneni, H; Yoder-Himes, D et al. (2016) Comparison of inherently essential genes of Porphyromonas gingivalis identified in two transposon-sequencing libraries. Mol Oral Microbiol 31:354-64
Wang, Huizhi; Zhou, Huaxin; Duan, Xiaoxian et al. (2014) Porphyromonas gingivalis-induced reactive oxygen species activate JAK2 and regulate production of inflammatory cytokines through c-Jun. Infect Immun 82:4118-26
Hendrickson, Erik L; Wang, Tiansong; Beck, David A C et al. (2014) Proteomics of Fusobacterium nucleatum within a model developing oral microbial community. Microbiologyopen 3:729-51
Wright, C J; Wu, H; Melander, R J et al. (2014) Disruption of heterotypic community development by Porphyromonas gingivalis with small molecule inhibitors. Mol Oral Microbiol 29:185-93
Wright, Christopher J; Xue, Peng; Hirano, Takanori et al. (2014) Characterization of a bacterial tyrosine kinase in Porphyromonas gingivalis involved in polymicrobial synergy. Microbiologyopen 3:383-94
Hirano, T; Beck, D A C; Wright, C J et al. (2013) Regulon controlled by the GppX hybrid two component system in Porphyromonas gingivalis. Mol Oral Microbiol 28:70-81
Kuboniwa, Masae; Tribble, Gena D; Hendrickson, Erik L et al. (2012) Insights into the virulence of oral biofilms: discoveries from proteomics. Expert Rev Proteomics 9:311-23
Hendrickson, Erik L; Wang, Tiansong; Dickinson, Brittany C et al. (2012) Proteomics of Streptococcus gordonii within a model developing oral microbial community. BMC Microbiol 12:211

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