George A. O'Toole, PhD
Professor of Microbiology and Immunology
Microbiology and Immunology
University of Wisconsin - Madison, Ph.D., 1994
Cornell University, B.S., 1988
After postdoctoral work at the University of Wisconsin-Madison and Harvard Medical School, Dr. O'Toole joined the faculty of the Department of Microbiology at Dartmouth Medical School in 1999
Molecular and Cellular Biology Graduate Programs
Molecular Pathogenesis Program
Dartmouth Medical School
Vail Building - HB 7550
Hanover NH 03755
The main focus of the Oâ€™Toole laboratory is the study of complex surface-attached bacterial communities known as biofilms. Biofilms can form on a wide variety of surfaces including catheter lines, surgical implants, contact lenses, the lungs of patients with cystic fibrosis, industrial and drinking water pipelines, and on the surfaces of plant roots. In most natural, clinical, and industrial settings bacteria live predominantly in biofilms and not as planktonic (free-swimming) cells such as those typically studied in the laboratory. Bacteria growing in biofilm communities are of great interest to the medical community, because these bacteria become highly resistant to antibiotics by an as yet unknown mechanism. Although much has been learned about the types of microbes that can form biofilms, the morphology of these communities, and their chemical/physical properties, until recently little was known about the molecular genetic basis of biofilm formation or antibiotic resistance.
Studies in the Oâ€™Toole lab focus on:
â€¢ The molecular genetic basis of biofilm formation.
â€¢ The role of the intracellular signaling molecule c-di-GMP in controlling biofilm formation by pseudomonads.
â€¢ The signal transduction pathways regulating biofilm formation.
â€¢ The mechanisms by which biofilms form on biotic, or living surfaces, and why these biofilms are so highly resistant to antibiotics. We have developed a novel model system for studying biofilms on airway epithelial cells, and these studies are done, in particular, in the context of cystic fibrosis.
â€¢ The role of lysogenic phages in impacting biofilm formation.
Recent collaborative studies with Dr. Bruce Stantonâ€™s group here at Dartmouth have explored questions of host-pathogen interactions, using the interplay between the bacterial pathogen Pseudomonas aeruginosa and airway epithelial cells as a model system. We are particularly interested in the role of the toxin, Cif, in altering epithelial cell biology and protein trafficking. We are also studying mechanisms by which P. aeruginosa delivers toxins to host cells.
Please visit the O'Toole Lab Home Page.
A Symphony of Cyclases: Specificity in Diguanylate Cyclase Signaling.
Classic Spotlights: Selected Highlights from the First 100 Years of the <i>Journal of Bacteriology</i>.
Pseudomonas aeruginosa-Derived Rhamnolipids and Other Detergents Modulate Colony Morphotype and Motility in the Burkholderia cepacia Complex.
<i>Pseudomonas aeruginosa</i> Alginate Overproduction Promotes Coexistence with <i>Staphylococcus aureus</i> in a Model of Cystic Fibrosis Respiratory Infection.
Bacteria, Rev Your Engines: Stator Dynamics Regulate Flagellar Motility.
Role of Cyclic Di-GMP and Exopolysaccharide in Type IV Pilus Dynamics.
Classic Spotlight: How the Gram Stain Works.
Classic Spotlight: Plate Counting You Can Count On.
Requirements for Pseudomonas aeruginosa Type I-F CRISPR-Cas Adaptation Determined Using a Biofilm Enrichment Assay.
Classic Spotlight: Bacteroides thetaiotaomicron, Starch Utilization, and the Birth of the Microbiome Era.