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Jack Gilbert

Jack Gilbert

Bldg: 202 Room: B373
Phone: (630) 252- 7489

Publication List
Earth Microbiome Project
Full Information

> Research Highlights:

Microbial communities: temporal and biogeographic structure

Coming primarily from a marine background I have been very interested in how bacteria exist in such a fluid matrix. Specifically, what determines how microbes exist when the medium in which they live is moving around so much? My research site in the Western English Channel has demonstrated that even though the sampling location is flushed with new water every two weeks, the same communities of microbes appear year after year. This highlights that microbes exist in robust and well-defined communities in this ecosystem. My ongoing research is to determine how true this is for all ecosystems around the planet.

Taxonomic diversity

There are a nonillion bacteria in the world (1 x 1030 cells) give or a take a few quadrillion. This almost incomprehensible number is greater than the number of stars in the known universe. To date no one has ever fully characterized the biodiversity of a microbial sample. Even the simplest communities seem to have a never-ending ‘tail’ of rare microorganisms, some of which seem to respond to episodic events producing ‘blooms’, while others seem to just exist in this rare state. We have now applied more the 20 million sequences to one sample from a marine ecosystem and still failed to catalogue all the diversity therein. Until we are able to fully characterize one of these communities, every effort to describe the global extent of microbial diversity will be extrapolative. Understanding biodiversity in any ecosystem, gives you an appropriate metric by which to describe it. Until we can do that we are describing the relative abundance of a subset of a given community. Understanding this concept, and exploring the limits of diversity are fundamental to my research goals.

Microbial Metabolic Dynamics

Microbes are vital to the success of life on this planet. They perform the vast majority of all metabolic processes, and also control health in every living organism on this planet. My lab uses metagenomics (literally meaning ‘beyond the genome’) to characterize the metabolic potential of a microbial community. We also use metatranscriptomics to explore the genes that are transcribed in every cell in a community. We then turn the sequence data into metabolic information by ascribing function to each potential gene or transcript and then defining their metabolic activity. Through comparison between one sample and another we can effectively describe how the metabolic activity of a community changes over time or space. This is essential to exploring functional and trophic interactions in a community, i.e. who eats who, who feeds of what, and who needs what?


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