James Andrew Alspaugh, MD

Professor of Medicine
Professor in Molecular Genetics and Microbiology
Campus mail DUMC Box 102359, 303 Sands Building, Research Drive, Durham, NC 27710
Phone (919) 684-0045
Email address andrew.alspaugh@duke.edu

The focus of my research is to understand the ways in which microorganisms sense and respond to changes in their environment. As microbial pathogens enter the infected host, dramatic genetic and phenotypic events occur that allow these organisms to survive in this harsh environment. We study the model fungal organism Cryptococcus neoformans to define signal transduction pathways associated with systemic fungal diseases. This pathogenic fungus causes lethal infections of the central nervous system in patients with AIDS and other immunological disorders. In addition to being an important pathogen, C. neoformans displays well-characterized and inducible virulence determinants. It is an outstanding system for dissecting the signaling pathways associated with pathogenicity.

The main techniques used in the lab are those of molecular genetics. We are able to readily mutate C. neoformans genes by homologous recombination. Mutant strains with disruptions in targeted genes are then evaluated in vitro for various phenotypes including altered expression of polysaccharide capsule and melanin. The effects of gene disruption on pathogenicity are also evaluated in animal models of cryptococcal disease. Using these techniques, we have identified a novel G-alpha protein/cAMP-dependent signaling pathway associated with mating and pathogenicity.

This research is complemented by the other investigators in the Duke University Mycology Research Unit. The members of this research community are pursuing studies in fungal pathogenesis, identifying novel antifungal drug targets, and studying the ecology of several medically important fungi.

Keywords: Microbial Pathogenesis
Cryptococcus neoformans
Signal transduction
Fungal mating
G proteins

Education and Training

  • M.D., Duke University, 1991

Publications

Nichols, CB, Ferreyra, J, Ballou, ER, and Alspaugh, JA. "Subcellular localization directs signaling specificity of the Cryptococcus neoformans Ras1 protein." Eukaryot Cell 8, no. 2 (February 2009): 181-189.

PMID
19098128
Full Text

Fortwendel, JR, Juvvadi, PR, Pinchai, N, Perfect, BZ, Alspaugh, JA, Perfect, JR, and Steinbach, WJ. "Differential effects of inhibiting chitin and 1,3-{beta}-D-glucan synthesis in ras and calcineurin mutants of Aspergillus fumigatus." Antimicrob Agents Chemother 53, no. 2 (February 2009): 476-482.

PMID
19015336
Full Text

Price, MS, Nichols, CB, and Alspaugh, JA. "The Cryptococcus neoformans Rho-GDP dissociation inhibitor mediates intracellular survival and virulence." Infect Immun 76, no. 12 (December 2008): 5729-5737.

PMID
18779335
Full Text

Olson, GM, Fox, DS, Wang, P, Alspaugh, JA, and Buchanan, KL. "Role of protein O-mannosyltransferase Pmt4 in the morphogenesis and virulence of Cryptococcus neoformans." Eukaryot Cell 6, no. 2 (February 2007): 222-234.

PMID
17142566
Full Text

Nichols, CB, Perfect, ZH, and Alspaugh, JA. "A Ras1-Cdc24 signal transduction pathway mediates thermotolerance in the fungal pathogen Cryptococcus neoformans." Mol Microbiol 63, no. 4 (February 2007): 1118-1130.

PMID
17233829
Full Text

Giles, SS, Stajich, JE, Nichols, C, Gerrald, QD, Alspaugh, JA, Dietrich, F, and Perfect, JR. "The Cryptococcus neoformans catalase gene family and its role in antioxidant defense." Eukaryot Cell 5, no. 9 (September 2006): 1447-1459.

PMID
16963629
Full Text

Cramer, KL, Gerrald, QD, Nichols, CB, Price, MS, and Alspaugh, JA. "Transcription factor Nrg1 mediates capsule formation, stress response, and pathogenesis in Cryptococcus neoformans." Eukaryot Cell 5, no. 7 (July 2006): 1147-1156.

PMID
16835458
Full Text

Alexander, BD, Dodds Ashley, ES, Addison, RM, Alspaugh, JA, Chao, NJ, and Perfect, JR. "Non-comparative evaluation of the safety of aerosolized amphotericin B lipid complex in patients undergoing allogeneic hematopoietic stem cell transplantation." Transpl Infect Dis 8, no. 1 (March 2006): 13-20.

PMID
16623816
Full Text

Vallim, MA, Nichols, CB, Fernandes, L, Cramer, KL, and Alspaugh, JA. "A Rac homolog functions downstream of Ras1 to control hyphal differentiation and high-temperature growth in the pathogenic fungus Cryptococcus neoformans." Eukaryot Cell 4, no. 6 (June 2005): 1066-1078.

PMID
15947199
Full Text

Fraser, JA, Huang, JC, Pukkila-Worley, R, Alspaugh, JA, Mitchell, TG, and Heitman, J. "Chromosomal translocation and segmental duplication in Cryptococcus neoformans." Eukaryot Cell 4, no. 2 (February 2005): 401-406.

PMID
15701802
Full Text

Pages