BBS Faculty Member - Paula Watnick

Paula Watnick

Division of Infectious Diseases


Boston Children's Hospital
Enders 760
300 Longwood Ave
Boston, MA 02115
Tel: 617-919-2918
Fax: 617-730-0254
Email: paula.watnick@childrens.harvard.edu



Vibrio cholerae is a marine organism, a symbiont of arthropods, and a pathogen of humans that causes severe and pandemic diarrheal disease. Cholera is acquired by ingestion of contaminated water or food. Because environmental persistence is critical to the epidemic spread of V. cholerae, our laboratory studies the adaptations V. cholerae uses to survive in aquatic environments and in arthropods. The following avenues of investigation are being pursued in our laboratory:

1) Structure and regulation of the Vibrio cholerae biofilm. Adhesion to abiotic surfaces in multicellular structures known as a biofilms is thought to be critical to the environmental survival of V. cholerae. Biofilm formation requires the synthesis of an extracellular matrix that may include exopolysaccharide, proteins, and DNA. In V. cholerae, synthesis of this matrix is very tightly regulated. We are studying signal transduction cascades that regulate synthesis of the V. cholerae biofilm matrix. In addition, we are defining the role that matrix-associated structural proteins play in the architecture of the biofilm.

2) Drosophila melanogaster as a model host for Vibrio cholerae. Arthropods are found with Vibrio species in the environment. We are using the model arthropod Drosophila melanogaster to better understand the association of V. cholerae with arthropods in the environment and to study the interaction of V. cholerae with a model host intestine. This system allows us to apply both host and pathogen genetics to our investigations. We have recently discovered that Vibrio cholerae manipulates intestinal stem cell turnover to decrease host tolerance to this infection. In addition, we are investigating products of bacterial metabolism that modulate host resistance and tolerance.



Last Update: 6/3/2014



Publications

For a complete listing of publications click here.

 


 

Vibrio cholerae biofilm references:
Karatan E, Watnick P, Signals, regulatory networks and materials that build and break bacterial biofilms, Microbiol Mol Biol Rev. 2009; 73:310-347.

Absalon C, Van Dellen K, and Watnick PI, A communal adhesion mediates attachment of
Vibrio cholerae to surfaces, PLoS Pathogens, 2011; 7:e1002210.

Absalon C, Ymele-Leki P, Watnick PI, The biofilm matrix as a platform for protein delivery, MBio, 2012; 4: e00127-2.

Pickering, BS, Smith DR, Watnick PI, Glucose-specific EllA has unique binding partners in the
Vibrio cholerae biofilm, MBio, 2012; 3:e00228-12.

Drosophila melanogaster as a model host references:
Blow N, Watnick PI, Vibrio cholerae infection of Drosophila melanogaster mimics the human disease cholera, PLoS Pathogens, 2005; 1:92-98.

Purdy A, and Watnick PI, Spatially selective colonization of the arthropod intestine through activation of
Vibrio cholerae biofilm formation, PNAS, 2011; 108: 19737-42.

Wang Z, Hang S, Purdy AE, Watnick PI, Mutations in the IMD pathway and Mustard counter
Vibrio cholerae suppression of intestinal stem cell division, MBio, 2013, 4: e00337-13.

Guichard A, Cruz Moreno B, Aguilar B, van Sorge NM, Kuang J, Kurkciyan AA, Wang Z, Hang S, Pineton de Chambrun GP, McCole DF, Watnick P, Nizet V, Bier E, Cholera toxin disrupts exocyst-mediated trafficking to intestinal cell junctions, Cell Host and Microbe, 2013, 14:294-305.



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