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Population genetics of microbial organisms.

D L Hartl1

  • 1Washington University School of Medicine, St Louis, Missouri.

Current Opinion in Genetics & Development
|December 1, 1992
PubMed
Summary

Population data suggest clonal reproduction in parasitic protozoa, but this is debated for Plasmodium falciparum. Even in bacteria like E. coli, recombination creates mosaic genes despite predominantly clonal reproduction.

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Area of Science:

  • Microbiology
  • Parasitology
  • Genetics

Background:

  • Clonal reproduction is common in parasitic protozoa like Trypanosoma and Leishmania.
  • The reproductive strategy of Plasmodium falciparum remains controversial.
  • Bacterial species such as Escherichia coli exhibit predominantly clonal reproduction.

Purpose of the Study:

  • To investigate the extent of recombination in Plasmodium falciparum.
  • To compare reproductive strategies across different microbial species.

Main Methods:

  • Analysis of population genetic data.
  • Comparative genomics of Plasmodium falciparum, Escherichia coli, and Salmonella.

Main Results:

  • Recombination in short chromosomal regions (< 1 kb) of E. coli results in mosaic gene structures.
  • Transposable elements in E. coli demonstrate complex population dynamics influenced by transposition, horizontal transfer, and fitness costs.
  • While predominantly clonal, E. coli shows evidence of genetic exchange.

Conclusions:

  • The hypothesis of purely clonal reproduction in Plasmodium falciparum requires further investigation.
  • Recombination, even at a limited scale, can significantly shape the genetic makeup of microbial populations.
  • Transposable elements play a dynamic role in bacterial evolution, balancing self-propagation with host fitness.

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