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Genetic complementation in apicomplexan parasites.

Boris Striepen1, Michael W White, Catherine Li

  • 1Department of Cellular Biology and Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA 30602, USA. striepen@cb.uga.edu

Proceedings of the National Academy of Sciences of the United States of America
|April 18, 2002
PubMed
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A new genetic tool for Apicomplexa, like Toxoplasma gondii, enables gene discovery and functional studies. This method also identified a bacterial-like gene in Cryptosporidium parvum, a potential therapeutic target.

Area of Science:

  • Parasitology
  • Molecular Biology
  • Genetics

Background:

  • Apicomplexa are important protozoan pathogens.
  • Functional analysis of genes in Apicomplexa is challenging.
  • A robust forward genetic model is needed for Apicomplexa.

Purpose of the Study:

  • To develop and test a genetic complementation strategy for Apicomplexa.
  • To establish an efficient tool for gene recovery and functional assessment.
  • To explore cloning genes based on function from other apicomplexan parasites.

Main Methods:

  • Genomic insertion-based genetic complementation in Toxoplasma gondii.
  • Adaptation of recombination cloning for genomic DNA.
  • Generation of a heterologous library using Cryptosporidium parvum genomic DNA.

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Main Results:

  • Successfully demonstrated genetic complementation and gene cloning in T. gondii.
  • Identified a Cryptosporidium parvum gene encoding inosine 5-monophosphate-dehydrogenase (IMPDH).
  • Phylogenetic analysis revealed a eubacterial origin of the C. parvum IMPDH gene, suggesting lateral gene transfer.

Conclusions:

  • The developed genetic strategy is an efficient tool for Apicomplexa functional genomics.
  • The identified C. parvum IMPDH gene of eubacterial origin presents a potential therapeutic target.
  • This approach facilitates the study of apicomplexan pathogens and their unique genetic elements.