The population biology of Coccidioides: Epidemiologic implications for disease outbreaks

Bridget M. Barker, K. A. Jewell, S. Kroken, M. J. Orbach

Research output: Chapter in Book/Report/Conference proceedingConference contribution

39 Scopus citations

Abstract

Studies of field- and patient-derived isolates conducted over the past 75 years have provided a general picture of the population structure of Coccidioides, the cause of coccidioidomycosis. Premolecular studies provided a general outline of the geographical range, epidemiology and distribution of the fungus. Recent studies based on molecular markers have demonstrated that the genus is comprised of two genetically diverse, and genetically isolated, species: Coccidioides immitis and C. posadasii. Both species are composed of biogeographically distinct populations. Structure for two of these populations (C. immitis from central California, and C. posadasii from southern Arizona) indicates that frequent genetic recombination occurs within the entire geographic range of each population, even though sex has never been observed in the genus. Outbreaks of coccidioidomycosis are not the result of the spread of a single clonal isolate, but are caused by a diversity of genotypes. Although it is now possible to match patient isolates to populations, the lack of apparent structure within each population and the current paucity of environmental isolates limit map-based epidemiological approaches to understanding outbreaks. Therefore, a comprehensive database comprised of soil-derived isolates from across the biogeographic range of Coccidioides will improve the utility of this approach. Appropriate collection of environmental isolates will assist the investigation of remaining questions regarding the population biology of Coccidioides. The comparative genomics of representative genotypes from both species and all populations of Coccidioides will provide a thorough set of genetic markers in order to resolve the population genetics of this pathogenic fungus.

Original languageEnglish (US)
Title of host publicationCoccidioidomycosis Sixth International Symposium
PublisherBlackwell Publishing Inc.
Pages147-163
Number of pages17
ISBN (Print)1573316881, 9781573316880
DOIs
StatePublished - Sep 2007

Publication series

NameAnnals of the New York Academy of Sciences
Volume1111
ISSN (Print)0077-8923
ISSN (Electronic)1749-6632

Keywords

  • Coccidioidomycosis
  • Microsatellites
  • Morphological species concept
  • Phylogenetic species concept
  • Population genetics
  • RFLPs
  • SNPs
  • SSRs
  • STRs

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • History and Philosophy of Science

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    Barker, B. M., Jewell, K. A., Kroken, S., & Orbach, M. J. (2007). The population biology of Coccidioides: Epidemiologic implications for disease outbreaks. In Coccidioidomycosis Sixth International Symposium (pp. 147-163). (Annals of the New York Academy of Sciences; Vol. 1111). Blackwell Publishing Inc.. https://doi.org/10.1196/annals.1406.040