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Mobile genetic elements in protozoan parasites.

Sudha Bhattacharya1, Abhijeet Bakre, Alok Bhattacharya

  • 1School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110 067, India. sb@mail.jnu.ac.in

Journal of Genetics
|January 18, 2003
PubMed
Summary

Mobile genetic elements, like retrotransposons, are crucial for genome evolution in protozoan parasites. These elements, found across various species, show early acquisition and diverse evolutionary paths.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Parasitology

Background:

  • Mobile genetic elements (MGEs) significantly influence genome evolution by relocating within chromosomes.
  • Protozoan parasites harbor diverse transposable elements (TEs), with trypanosomatids exhibiting the widest variety.
  • These TEs are found in various genomic locations, including spliced-leader RNA genes and dispersed throughout the genome.

Purpose of the Study:

  • To analyze the types and genomic distribution of transposable elements in key protozoan parasites.
  • To understand the evolutionary origins and functional potential of these mobile genetic elements.
  • To compare the characteristics of protozoan TEs with those found in other organisms, such as mammals.

Main Methods:

  • Nucleotide sequence analysis of transposable elements from various protozoan parasites.

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  • Comparative genomics to identify different families and their locations.
  • Phylogenetic analysis to infer evolutionary relationships and acquisition times.

    • Main Results:

    • All analyzed elements are retrotransposons, primarily non-long-terminal-repeat retrotransposons.
    • Elements exhibit diverse insertion sites, including site-specific and dispersed genomic locations.
    • Protozoan retrotransposons potentially encode key enzymatic activities and show evidence of early evolutionary acquisition.

    Conclusions:

    • Retrotransposons were acquired early in protozoan parasite evolution, indicating ancient origins.
    • The presence of autonomous and non-autonomous elements parallels mammalian LINEs and SINEs, suggesting convergent evolutionary themes.
    • Further genomic studies are essential to elucidate the precise functions and evolutionary trajectories of these MGEs in parasites.