The environmental fungal pathogens Coccidioides and Histoplasma have been proposed as agents of warfare because of their easy availability, stability of spores, and infection by aerosolization (Casadevall and Pirofski, 2006);thus more knowledge about the pathogenesis of these closely related organisms is critical to biodefense. Each of these organisms converts to a parasitic form in mammalian hosts after inhalation of infectious spores from the soil.
We aim to understand pathogenesis of these fungi by identifying fungal genes that promote disease and manipulate the host. To do so, we propose a collaboration between two biologists who study human pathogenic fungi, one experienced in fungal evolutionary biology (John Taylor, UC Berkeley) and one experienced in fungal molecular and developmental molecular biology (Anita Sil, UCSF). Use of a comparative genomics approach to analyze Coccidioides and Histoplasma is likely to be fruitful because of their close evolutionary relationship and the similarities of their lifestyles in the soil and the host. We will take advantage of information inherent in the genomes of these pathogens and related fungi to generate a set of genes most likely to influence disease. This comparative approach will reveal genes that have undergone strong positive selection in these fungal pathogens. Additionally, we will identify conserved genes in Coccidioides and Histoplasma that are implicated in the conversion to the parasitic form of each organism by virtue of their role in Histoplasma. These studies will allow us to prioritize a testable number of candidate virulence genes that will be assessed for their role in pathogenicity in the mouse models of Coccidioides and Histoplasma infection. In addition, these studies will identify organism-specific targets for diagnosis, therapy and vaccination, and thus are designed to interface closely with Coccidioides projects proposed by Marc Orbach and John Galgiani.
Coccidioides and Histoplasma are primary pathogens that infect several hundred thousand individuals per year in the U.S. alone. Each is a significant source of morbidity and mortality in immunocompromised patients. Since very little is understood about how either fungus causes disease, the identification of fungal factors that influence pathogenesis will significantly advance the field and provide fodder for the development of new diagnostics and therapeutics.
|Tsai, Wen-Yang; Youn, Han Ha; Tyson, Jasmine et al. (2018) Use of Urea Wash ELISA to Distinguish Zika and Dengue Virus Infections. Emerg Infect Dis 24:1355-1359|
|Thongsripong, Panpim; Chandler, James Angus; Green, Amy B et al. (2018) Mosquito vector-associated microbiota: Metabarcoding bacteria and eukaryotic symbionts across habitat types in Thailand endemic for dengue and other arthropod-borne diseases. Ecol Evol 8:1352-1368|
|Katzelnick, Leah C; Ben-Shachar, Rotem; Mercado, Juan Carlos et al. (2018) Dynamics and determinants of the force of infection of dengue virus from 1994 to 2015 in Managua, Nicaragua. Proc Natl Acad Sci U S A 115:10762-10767|
|Clemens, Daniel L; Lee, Bai-Yu; Horwitz, Marcus A (2018) The Francisella Type VI Secretion System. Front Cell Infect Microbiol 8:121|
|Huwyler, Camille; Heiniger, Nadja; Chomel, Bruno B et al. (2017) Dynamics of Co-Infection with Bartonella henselae Genotypes I and II in Naturally Infected Cats: Implications for Feline Vaccine Development. Microb Ecol 74:474-484|
|Norris, Michael H; Heacock-Kang, Yun; Zarzycki-Siek, Jan et al. (2017) Burkholderia pseudomallei natural competency and DNA catabolism: Identification and characterization of relevant genes from a constructed fosmid library. PLoS One 12:e0189018|
|Marques, Adriana R; Yang, Xiuli; Smith, Alexis A et al. (2017) Citrate Anticoagulant Improves the Sensitivity of Borreliella (Borrelia) burgdorferi Plasma Culture. J Clin Microbiol 55:3297-3299|
|Nualnoi, Teerapat; Norris, Michael H; Tuanyok, Apichai et al. (2017) Development of Immunoassays for Burkholderia pseudomallei Typical and Atypical Lipopolysaccharide Strain Typing. Am J Trop Med Hyg 96:358-367|
|Parameswaran, Poornima; Wang, Chunling; Trivedi, Surbhi Bharat et al. (2017) Intrahost Selection Pressures Drive Rapid Dengue Virus Microevolution in Acute Human Infections. Cell Host Microbe 22:400-410.e5|
|Bortell, Nikki; Flynn, Claudia; Conti, Bruno et al. (2017) Osteopontin Impacts West Nile virus Pathogenesis and Resistance by Regulating Inflammasome Components and Cell Death in the Central Nervous System at Early Time Points. Mediators Inflamm 2017:7582437|
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