The goal of this project is to develop a computational framework that can learn microbe-microbe and host-microbe interactions from time series of small and large microbial communities. Molecular analyses of human-associated microbial communities have already started to reveal associations between community structure and human health and disease. Also apparent from these initial studies is the dynamic nature of the host-associated microbiomes ? even in healthy individuals the microbiome changes even within days, let alone over longer periods of a person's life. These changes, as well as the microbiome changes that underlie the initiation of disease, or the restoration of health after treatment, can only be fully understood by elucidating the complex networks of interactions between the members of the community. These networks cannot currently be observed experimentally as scientists have yet to fully characterize the genomic structure of the members of the community. The current proposal targets methods for inferring the interaction networks, and their parameters, by indirectly examining time-series data about the composition of host-associated communities. Novel analytical methods will be developed that can robustly learn the parameters of dynamic models from time-series data. Furthermore, several approaches will be explored for reducing the complexity of the systems derived from large microbial communities comprising hundreds to thousands of microbes. The methods developed will be evaluated on simulated and real datasets, both to validate the methods, and to evaluate the effects of experimental parameters (such as processing of microbiome data, level of noise, or sparsity of time-series information) on the ability to reconstruct dynamic models of typically encountered human-associated microbial communities.

Public Health Relevance

The structure and dynamics of microbial communities is determined by microbe-microbe and microbe-environment interactions. Dynamic changes within the host-associated microbiome possibly explain the mechanisms that underlie the transition from health to disease. This proposal will develop a computational framework that can determine microbe-microbe and host-microbe interactions from time series of small and large microbial communities.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Exploratory/Developmental Grants (R21)
Project #
1R21GM107683-01
Application #
8570943
Study Section
Modeling and Analysis of Biological Systems Study Section (MABS)
Program Officer
Sledjeski, Darren D
Project Start
2013-09-20
Project End
2015-08-31
Budget Start
2013-09-20
Budget End
2014-08-31
Support Year
1
Fiscal Year
2013
Total Cost
$162,913
Indirect Cost
$41,079
Name
Virginia Polytechnic Institute and State University
Department
Biostatistics & Other Math Sci
Type
Schools of Arts and Sciences
DUNS #
003137015
City
Blacksburg
State
VA
Country
United States
Zip Code
24061