Sulfa or sulfone prophylaxis and geographic region predict mutations in the Pneumocystis carinii dihydropteroate synthase gene

J Infect Dis. 2000 Oct;182(4):1192-8. doi: 10.1086/315824. Epub 2000 Sep 8.

Abstract

To determine factors associated with mutations in the Pneumocystis carinii dihydropteroate synthase (DHPS) gene, a prospective study of human immunodeficiency virus (HIV)-infected patients with confirmed P. carinii pneumonia was conducted in Atlanta, Seattle, and San Francisco. Clinical information was obtained from patient interview and chart abstraction. DHPS genotype was determined from DNA sequencing. Overall, 76 (68.5%) of 111 patients had a mutant DHPS genotype, including 22 (81.5%) of 27 patients from San Francisco. In multivariate analysis, sulfa or sulfone prophylaxis and study site were independent predictors of a mutant genotype. Fourteen (53.8%) of 26 patients who were newly diagnosed with HIV infection and had never taken prophylaxis had a mutant genotype. The significance of geographic location as a risk factor for mutant genotype and the high proportion of mutant genotypes among persons never prescribed prophylaxis, including those newly diagnosed with HIV infection, provide indirect evidence that these mutations are transmitted from person to person either directly or through a common environmental source.

Publication types

  • Multicenter Study
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • AIDS-Related Opportunistic Infections / microbiology
  • AIDS-Related Opportunistic Infections / prevention & control
  • Adult
  • Analysis of Variance
  • Antibiotic Prophylaxis*
  • Dihydropteroate Synthase / genetics*
  • Ethnicity
  • Female
  • Genotype
  • Geography
  • Georgia
  • HIV Infections / complications
  • HIV Infections / microbiology
  • Humans
  • Male
  • Mutation*
  • Pneumocystis / enzymology
  • Pneumocystis / genetics*
  • Pneumocystis / isolation & purification
  • Pneumonia, Pneumocystis / microbiology*
  • Pneumonia, Pneumocystis / prevention & control*
  • Racial Groups
  • San Francisco
  • Sulfonamides / therapeutic use*
  • Washington

Substances

  • Sulfonamides
  • Dihydropteroate Synthase