The University of Massachusetts Amherst
 
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Susan Leschine

Professor

Humans and other animals comprise microbial communities that are essential for health. In particular, gastrointestinal tracts of animals are colonized by hundreds of microbial species that contribute to nutrition and health in myriad ways, many of which are only now being recognized. Our research is focused on microbes that convert complex plant polymers into chemicals that have commercial value, such as biofuels, or play a direct role in animal and human health. We are testing the hypothesis that these microbes link nutrition to health via their metabolism of plant polysaccharides. Our research is aimed at harnessing the diversity of gut microbial communities and the power of genomics for novel technologies to benefit animal and human health.

Current Research
The diversity of the microbial world is enormous, and microbes constitute a valuable physiological and genetic resource. The overarching goal of our research is to advance understanding of the biology of diverse microorganisms and interactions among these organisms and their environments.

The most abundant organic materials on Earth are plant structural polysaccharides such as cellulose, and the decomposition of these complex carbohydrates is carried out almost exclusively by microorganisms. A major objective of our research program is to expand our knowledge of the physiology, ecology, and diversity of polysaccharide-decomposing members of microbial communities, to discern the nature of key interactions among community members and with their insoluble substrates, and to understand how these interactions may contribute to the efficient degradation of insoluble polysaccharides. Much of our research has focused on Clostridium phytofermentans, a bacterium discovered in forest soil near Quabbin Reservoir, which possesses unique properties including the ability to catalyze the direct conversion of plant biomass to ethanol. Based on the capabilities of this microbe, we developed a technology for cellulosic biofuel production. This technology has been licensed by UMass to a Massachusetts biofuels company.

Most animals lack the enzymatic capacity required to digest cellulose and many other components of plant cell walls, and instead rely on plant biomass-decomposing microbial communities to provide nutrition from plant fiber. Ruminants, a group of herbivorous mammals, degrade forage in a specialized foregut organ, the rumen. The microbial community housed in the rumen plays an essential role in development and health of the ruminant by decomposing and fermenting plant materials, and forming products that serve as essential nutrients. In humans, complex plant carbohydrates, known as “dietary fiber,” serve as substrates for intestinal microbes that ferment these plant polymers to short chain fatty acids, such as butyrate, which are tied to colonic and systemic health.

With the recent explosion of metagenomic data and studies of human and animal microbiomes, it has become apparent that relatives of C. phytofermentans (members of the Lachnospiraceae family) form a significant component of beneficial intestinal microbial communities. This observation has led to the hypothesis that these microbes may form a link between nutrition and health, related to their metabolism and the ability to transform complex plant substances into health-promoting nutrients. Currently, we are testing this hypothesis by examining the potential of these microbes to enhance the nutritional value of fibrous animal feeds.

Learn more at www.vasci.umass.edu/research-faculty/susan-leschine

Academic Background

  • PhD University of Pittsburgh

Honors

  • Waksman Lecturer, Waksman Foundation for Microbiology; Women to Watch, Mass High Tech: The Journal of New England Technology; Top Ten Women in Cleantech, Earth2Tech; Top 25 Women in Technology, AlwaysOn Network; Top Ten Women of Biofuels, Women In Cleantech & Sustainability; Biotech Humanitarian Award, Biotechnology Industry Organization
Alvelo-Maurosa JG, Lee SJ, Hazen SP, Leschine SB. 2016. Direct image-based enumeration of Clostridium phytofermentans on insoluble plant biomass growth substrates. Applied and Environmental Microbiology 82:972–978 (doi:10.1128/AEM.03119-15).
Petit E, Coppi MV, Hayes JC, Tolonen AC, Warnick T, Latouf WG, Amisano D, Biddle A, Mukherjee S, Ivanova N, Lykidis A, Land M, Hauser L, Kyrpides N, Henrissat B, Lau J, Schnell DJ, Church GM, Leschine SB, Blanchard JL. 2015. Genome and transcriptome of Clostridium phytofermentans, catalyst for the direct conversion of plant feedstocks to fuels. PLoS ONE 10(6): e0118285 (doi:10.1371/journal.pone.0118285).
Leschine S, Paster BJ. 2015. Spirochaeta, p. 1 – 18. In W. B. Whitman (ed.), Bergey's Manual of Systematics of Archaea and Bacteria (Published Online 14 September 2015), John Wiley & Sons, Inc. (In association with Bergey’s Manual Trust), Hoboken, NJ. doi:10.1002/9781118960608.gbm01248
Biddle AS, Leschine S, Huntemann M, Han J, Chen A, Kyrpides N, Markowitz V, Palaniappan K, Ivanova N, Mikhailova N, Ovchinnikova G, Schaumberg A, Pati A, Stamatis D, Reddy T, Lobos E, Goodwin L, Nordberg HP, Cantor MN, Hua SX, Woyke T, Blanchard JL. 2014. The complete genome sequence of Clostridium indolis. Standards In Genomic Sciences, 9(3) (doi:10.4056/528).
Zuroff TR, Gu W, Fore RL, Leschine SB, Curtis WR. 2014. Insights into Clostridium phytofermentans biofilm formation: aggregation, microcolony development and the role of extracellular DNA. Microbiology 160:1134-1143 (doi: 10.1099/mic.0.078014-0) Epub 2014 Mar 13.
Tolonen AC, Petit E, Blanchard JL, Warnick T, Leschine SB. 2014. Technologies to study plant biomass fermentation using the model bacterium Clostridium phytofermentans, Chapter 7, p 114–139. In J Sun, S Ding, JD Peterson (ed.), Biological Conversion of Biomass for Fuels and Chemicals: Explorations from Natural Biomass Utilization Systems, Royal Society of Chemistry, London (doi: 10.1039/9781849734738-00114).
Petit E, LaTouf WG, Coppi MV, Warnick TA, Currie D, Romashko I, Deshpande S, Haas K, Alvelo-Maurosa JG, Wardman C, Schnell DJ, Leschine SB, Blanchard JL. 2013. Involvement of a bacterial microcompartment in the metabolism of fucose and rhamnose by Clostridium phytofermentans. PLoS ONE 8(1): e54337 (doi:10.1371/journal.pone.0054337).
Biddle A, Stewart L, Blanchard J, Leschine S. 2013. Untangling the genetic basis of fibrolytic specialization by Lachnospiraceae and Ruminococcaceae in diverse gut communities. Diversity 5(3):627-640 (doi:10.3390/d5030627).
 
Contact Info

Department of Veterinary & Animal Sciences
N467 Life Science Laboratories
240 Thatcher Rd
Amherst MA 01003-9364

413-335-8255
leschine@vasci.umass.edu

www.vasci.umass.edu/research-faculty/susan-leschine