BBS Faculty Member - Matthew Waldor

Matthew Waldor

Department of Medicine

Brigham and Women's Hospital
Channing Laboratory and HHMI
181 Longwood Avenue
Boston MA 02115
Tel: 617-525-4646
Fax: 617-525-4660
Email: mwaldor@rics.bwh.harvard.edu
Lab Members: 7 postdoctoral fellows, 2 graduate students, 2 research associates



We are exploring pathogen-host interactions, particularly in the context of animal models relevant to human infection of clinically important enteric pathogens including Vibrio cholerae, Vibrio parahaemolyticus and enterohemorrhagic Escherichia coli (EHEC).

Major on-going projects include:

I. Use of infant rabbit models of diarrheal disease to study host-pathogen interactions. Studies of the biology of enteric pathogens during infection have been hampered by the lack of non-surgical small animal models of diarrheal disease. We found that infant rabbits orally inoculated with EHEC,
V. cholerae or V. parahaemolyticus develop diarrheal diseases that mimic the respective human infections. We are taking advantage of these models to gain insights into bacterial physiology during growth in the host as well as host-pathogen interactions.

II. Development and implementation of new approaches to comprehensively identify pathogen and host factors critical for virulence using high throughput transposon- and CRISPR-based screens.

III. We developed an approach (STAMP) that utilizes high-throughput sequencing data to characterize pathogen population dynamics within an infected host. Such analyses reveal the extent and sites of host barriers to infection, as well as pathways by which pathogens disseminate within hosts. We are using STAMP to investigate
V. cholerae transmission and to define the factors that control V. cholerae population dynamics. STAMP analyses are particularly interesting for pathogens that disseminate to secondary sites of infection through uncharacterized bottlenecks; e.g., we are using STAMP to investigate passage of Listeria monocytogenes from the GI tract to secondary infection sites. These studies will also identify pathogen and host factors that modulate dissemination routes and founding population sizes.

IV. D-amino acids in bacterial and host physiology. We found that diverse bacteria release a variety of D-amino acids both in culture and in the intestine. We are studying the mechanisms by which released D- amino acids control cell wall metabolism and cell shape as well as modulate host defense against pathogens and the composition of the intestinal microbiota.

V. Applying single molecule real time DNA sequencing to assess the extent, diversity and functional consequences of DNA modifications (e.g. methylation) in enteric pathogens.



Last Update: 8/4/2015



Publications

For a complete listing of publications click here.

 


 

Abel S, Abel Zur Wiesch P, Chang HH, Davis BM, Lipsitch M, Waldor MK. Sequence tag-based analysis of microbial population dynamics. Nature Methods. 12: 223-6, 2015.

Dörr T, Davis BM, Waldor MK. Endopeptidase-mediated beta lactam tolerance.
PLoS Pathog. 11(4):e1004850, 2015.

Pritchard JR, Chao MC, Abel S, Davis BM, Baranowski C, Zhang YJ, Rubin EJ, Waldor MK. ARTIST: high-resolution genome-wide assessment of fitness using transposon-insertion sequencing.
PLoS Genet. 10(11): e1004782, 2014.



© 2015 by the President and Fellows of Harvard College