home

 

Bruce R. Levin

Samuel Candler Dobbs Professor of Biology

Emory University

Dept. of Biology
1510 Clifton Road
Atlanta, GA 30322
Office: 404 - 727 - 2826
Lab: 404 - 727 - 2956
Fax:  404 - 727 - 2880
 
e-mail me:  blevin@emory.edu

Some recognized prejudices

'Doing research in population biology without mathematical and/or computer simulation models is like playing tennis without a net or boundary lines'.

'Data may be a crutch for the insecure, but really self-confident scientists subject their hypotheses to tests that can reject them'

'Just because a project may be useful, that doesn't mean its not interesting, high-quality and delicious to work on Science.'

'For us, natural and not-so-natural selection is about dN/dt and not dN/dS.'

Our research includes mathematical and computer simulation modeling and in vitro and laboratory animal experiments on the population and evolutionary biology of bacteria and their viruses and accessory genetic elements. In addition to investigations addressing precious academic ecological and evolutionary questions,  we also do studies applying population dynamic and evolutionary theory and experiments to health-related problems. Among the latter are investigations of the epidemiology of pathogenic bacteria, antimicrobial chemotherapy and the evolution of resistance, the pharmacodynamics and pharamacokinetics of antibiotics and the within-host population and evolutionary dynamics of bacterial infections and their treatment with antibiotics.

The following is a list the projects on which we are currently (February 2009) working and the names of the primary investigator(s) involved in these studies. Unless otherwise noted, BRL’s role in these endeavors is more that of a producer, advisor, prodder, kibitzer, modeler, programmer, occasional, overpaid technician, editor and general busybody rather than a day-to-day collaborator. For more information about these projects, write to the first investigator listed for that project.

Those projects in bold print are at the stage where we are ready to show them off; draft manuscripts describing the results of some or all elements of these projects are available. You are welcome to copies of these manuscripts. You are also welcome to information about the goals, status and major results of our other ongoing projects.  Just write to Bruce

  1. The population and evolutionary dynamics of Vibrio cholerae in experimental communities with bacteriophage JSF4, alge and crustecea - Yan Wei (PhD Student), Paulo Ocampo (PhD student, ETH Zurich) and Bruce R. Levin
  2. The population and evolutionary dynamics of the bacteriophage Peru 2 and Vibrio cholerae in experimental populations.  Yan Wei (PhD student),  Jim Bull (University of Texas Austin) and Bruce R. Levin 
  3. A theoretical and experimental study of the role of motility on the competitive performance of bacteria in physically structured habitats. Yan Wei (PhD student), Howie Weiss (Dept. of Mathematics, GA Tech), Bruce R. Levin 
  4. A theoretical and experimental study of the contributions of the physiological state to the pharmacodynamics of antibiotics and the treatment of Staphylococcus aureus. Klas Udekwu (Postdoc) Bruce R. Levin.
  5. An experimental study of the effects of biofilms and clumping on the pharmacodynamics of antibiotics with E. coli, Staphylococcus aureus and Mycobacteria marinium.  Kim Garner (Super Technician Emeritus), Pierre Ankomah (MD/PhD student), Amy Pierce (Postdoc) and Bruce R. Levin
     
  6. The population dynamics of plasmid-mediated recombination in E. coli.  Omar Cornejo (PhD - now Postdoc at Cornell University) and Bruce R. Levin
  7. The contribution of antibiotic prophylaxis and treatment to the epidemiology and rates of mortality of pandemic influenza, Yu-Wen Chien (PhD Student, Emory Univeristy School of Public Health), Keith Klugman and Bruce R. Levin.
  8. Within-host population and evolutionary dynamics of tuberculosis and its treatment – in silico, in vitro and possibly in vivo studies using Mycobacterium marinum and as a model organisms. Pierre Ankomah MD/PhD student.
  9. Epidemiology of hospital-acquired infections. Antibiotic control of antibioitic resistance in hopsitals. Michael Haber (Emory School of Public Health), Piotr Kramarz (WHO), Bruce R. Levin
  10. A theoretical study of the population and evolutionary dynamics of lytic phage and conjugative plasmids with bacteria bearing CRISPR - mediated acquired immunity, Bruce R. Levin 

Some recent publications from our Lab: For an almost complete list of our articles, click on "Publications"

  • Haber, M. B.R. Levin and P. Kramarz (2010) Antibiotic control of antibiotic resistance in hospitals: A simulation study. BMC (In Press)
  • Wei, Y, P. Ocampo and B. R. Levin (2010) An Experimental study of the population and evolutionary dynamics of vibrio cholerae O1 and the Bacteriophage JSF4. Proc. Royal Soc. Lond. B On Line [PDF]
  • Levin, B.R. and K. Udekwu (2010) The population dynamics of antibiotic treatment:  a mathematical model and hypotheses for time-Kill and continuous culture experiments. Antimicrobial Agents and Chemotherapy 54(8): 3414-3426 [PDF]
  • Margolis, E. A. Yates, and B.R. Levin (2010) The ecology of nasal colonization of Streptococcus pneumoniae, Haemophilus influenzae and Staphylococcus aureus: the role of competition and interactions with host's immune response.  BMC Microbiology 2010, 10:59 doi:10.1186/1471-2180-10-59 [PDF]
  • Cornejo OE, McGee, L. and DE Rozen (2010).   Polymorphic competence peptides does not restrict recombination in Streptococcus pneumoniae.  Molecular Biology and Evolution 27(3): 694-702. [PDF] [Supplementary Online Materials]
  • Johnsen, P.J and B.R. Levin (2010) Adjusting to alien genes.  Molecular Microbiology On Line [PDF]
  • Levin, B.R. and O.E. Cornejo (2009) The population and evolutionary dynamics of homologous gene recombination in bacteria. PLoS Genetics 5 (8) e1000601 [PDF]
  • Johnsen, P.J, D. Dubnau, and B. R. Levin (2009) Episodic selection and the maintenance of competence and natural transformation in Bacillus subtilis  GENETICS  181: 1521-1533 [PDF]
  • Udekwu, K,  N. Parrish, P. Ankomah, , F. Baquero and BR Levin (2009) Functional relationship between cell density and the efficacy of antibiotics. Journal of Antimicrobial Chemotherapy 63:745-767 [PDF]
  • Margolis, E. (2009) Hydrogen peroxide mediated interference competition by Streptococcus pneumoniae has no significant effect on Staphylococcal nasal colonization of neonatal rats J. Bact. 191: 571-575 [PDF]
  • Cornejo, O.E., D. Rozen, R.M. May and B.R. Levin (2009) Oscillations in continuous culture populations ofStreptococcus pneumoniae: Population dynamics and the evolution of clonal suicide  (Proceeding Royal Society B, 276: 999-1008  [PDF] [Supplemental On Line Material]
  • Handel, A, E. Margolis and B.R. Levin (2008) Exploring the role of the immune response in preventing antibiotic resistance Journal of Theoretical Biology 256:666-662 [PDF]
  • Margolis, E. and B. R. Levin (2008) The evolution of bacteria-host interactions: virulence and the immune over-response. IN “Introduction to the Evolutionary Biology of Bacterial and Fungal Pathogens ” J-A. Gutteriez and F.M. Baquero Editors (ASM Press)  [PDF] Also published in "Microbial Evoiution and Co-Adaptation: A Tribute to the Life and Scientific Legacies of Joshua Lederberg (2009) P. 137:157 ( http://www.nap.edu/catalog/12586.html)  For the whole Pathogen Evolution Chapter[PDF]
  • Lemonnier , M, B.R. Levin, T. Romeo, K, Garner, M-R. Baquero, J. Mercante, E. Lemichez, F. Baquero, and J. Blázquez (2008) Evolution of contact-dependent inhibition in non-growing populations of E. coli. Proc. Roy. Society B Proc. Royal Soc. B. 275:3-10[PDF] [Supplemental On Line Material]
  • Margolis, E. and B.R. Levin 2007 Within–Host Evolution for the Invasiveness of Commensal Bacteria: an experimental study of bacteremias resulting from Haemophilus influenzae nasal carriage, Journal of Infectious Disease 175: 1069-1075.[PDF]
  • Rozen, D. E. L.E. McGee, B.R. Levin and K. P. Klugman (2007) .The fitness costs of fluoroquinolone resistance in Streptococcus pneumoniae. Antimicrobial Agents and Chemotherapy, 51:412-416.[PDF]
  • Meltz-Steinberg, K. and B.R. Levin (2007) Grazing protozoa and the evolution of the Escherichia coli O157:H7 Shigatoxin-encoding prophage. Proceedings of the Royal Society of London B Series (Biology) 274: 1921 - 1929.[PDF]
  • Lipsitch, M., T. Cohen, M. Murray, B.R. Levin (2007) Antiviral resistance and the control of pandemic influenza. PLoS Med 41: e15.[PDF]

Current research support (grants):

  • Theoretical and experimental studies of the population and evolutionary dynamics of antibiotic treatment. National Institutes of Health 9R01GM091875-10