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Mobile Group II Introns as Ancestral Eukaryotic Elements.

Olga Novikova1, Marlene Belfort2

  • 1Department of Biological Sciences and RNA Institute, University at Albany, 1400 Washington Avenue, Albany, NY 12222, USA.

Trends in Genetics : TIG
|August 19, 2017
PubMed
Summary
This summary is machine-generated.

Group II introns, mobile genetic elements, are key to eukaryotic evolution. Their self-splicing and retromobility likely shaped retroelements and the spliceosome, impacting all domains of life.

Keywords:
retrotransposonribozymespliceosometelomerase

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Group II introns exhibit dual functions: self-splicing and retromobility.
  • These introns are found across all three domains of life, indicating their evolutionary success.
  • While related to prokaryotic and organellar introns, eukaryotic introns show distinct survival strategies.

Purpose of the Study:

  • To explore the hypothesized role of group II introns in the evolution of eukaryotes.
  • To investigate the contribution of group II introns to the emergence of eukaryotic retroelements and spliceosomes.
  • To understand the evolutionary relationship between group II introns and eukaryotic genetic components.

Main Methods:

  • Comparative genomics analysis of group II intron distribution.
  • Phylogenetic analysis of intron sequences.
  • Functional studies of self-splicing and retromobility mechanisms.

Main Results:

  • Group II introns are proposed as foundational elements for eukaryotic retroelements and spliceosomal introns.
  • Evidence suggests a direct evolutionary link between group II introns and key eukaryotic genetic machinery.
  • Differences in survival strategies are noted between prokaryotic/organellar and potentially eukaryotic group II introns.

Conclusions:

  • The unique duality of group II introns was crucial for eukaryotic genome evolution.
  • These mobile genetic elements likely facilitated the development of complex eukaryotic features.
  • Understanding group II introns offers insights into the origin of spliceosomes and retroelements.