Sonia Bardy

Assistant Professor
 (414) 229-6415
 Lapham Hall 464


  • Postdoctoral Research Fellow (Janine Maddock, advisor), University of Michigan, Ann Arbor Michigan, 2004-2009
  • PhD, Department of Microbiology and Immunology, Queen’s University, Kingston Canada (Ken Jarrell, advisor), 1999-­2004
  • BSc, Department of Microbiology, University of Guelph, Guelph, Canada, 1995-1999

Research Interests

There are currently two major research projects in our lab. The first focuses on spatial organization of proteins within a bacterial cell. We focus our studies on the chemotaxis systems within Pseudomonas aeruginosa, and seek to elucidate how protein localization is correlated to function. In this project, we are investigating the connection between polar localization and function of the Chp chemosensory system. In addition, we are also investigating the mechanism of partitioning chemotaxis proteins that regulate flagellar based motility.

The second project focuses on the role of pyomelanin in Pseudomonas aeruginosa virulence. Pyomelanin is an extracellular pigment produced by some clinical isolates. Pyomelanin protects P. aeruginosa from the immune response, by providing protection from oxidative stress. Inhibition of pyomelanin production results in increased sensitivity to oxidative stress, and results in increased bacterial death. We hope to develop an anti‑virulence agent that can be used in conjunction with antibiotics to increase clearing of infections. By targeting a non-essential virulence factor (pyomelanin), it is unlikely that resistance to the anti‑virulence agent will occur.

Selected Publications

Feriancikova, L., Bardy, Sonia L., Wang, L., Ki, J., and Xu, S. “Effects of outer membrane protein TolC on the transport of Escherichia coli within saturated quartz sands.” Environ. Sci. Technol. 47.11 (2013): 5720-5728.
Walczak, Jacob J., Wang, Lixia, Bardy, Sonia L., Feriancikova, Lucia, Li, Jin, and Xu, Shangping. “The effects of starvation on the transport of Escherichia coli in saturated porous media are dependent on pH and ionic strength.” Colloids and Surfaces B: Biointerfaces 90. (2012): 129-136.
Walczak, J. J., Bardy, Sonia L., Feriancikova, L., and Xu, S. “Transport of Escherichia coli isolated from Lake Michigan in saturated porous media: Influence of tetracycline resistance.” Water, Air and Soil Pollution 222.1-4 (2011): 305-314.
Walczak, Jacob J., Bardy, Sonia L., Feriancikova, Lucia, and Xu, Shangping. “Influence of tetracycline resistance on the transport of manure-derived Escherichia coli in saturated porous media.” Water Research 45.4 (2010): 1681-90.
Bardy, Sonia L., and Maddock, J. R. “Polar explorations: Recent insights into the polarity of bacterial proteins.” Curr. Opin. Microbiol. 10.6 (2007): 617-23.
Bardy, Sonia L., and Maddock, J. R. “Polar localization of a soluble MCP of Pseudomonas aeruginosa.” J. Bacteriol. 187.22 (2005): 7840-7844.