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Related Experiment Videos

Complex spliceosomal organization ancestral to extant eukaryotes.

Lesley Collins1, David Penny

  • 1Allan Wilson Centre for Molecular Ecology and Evolution, Massey University, Palmerston North, New Zealand. L.J.Collins@massey.ac.nz

Molecular Biology and Evolution
|January 22, 2005
PubMed
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The spliceosome, crucial for RNA splicing in eukaryotes, was surprisingly complex in the last common ancestor, containing most core components and functions seen today. Minor splicing (U12-dependent) is not evident in this ancestral spliceosome.

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genetics

Background:

  • The spliceosome is a large molecular machine responsible for removing introns from pre-mRNAs in eukaryotes.
  • Its evolution and complexity in early eukaryotes are not fully understood.
  • Intron length has increased in multicellular eukaryotes, suggesting spliceosome evolution.

Purpose of the Study:

  • To infer the properties of the spliceosome in the last common eukaryotic ancestor.
  • To test the hypothesis that spliceosome complexity increased throughout eukaryotic evolution.

Main Methods:

  • Comparative analysis of spliceosomal protein components across diverse basal eukaryotic lineages.
  • Inference of ancestral spliceosome composition and function based on present-day distribution.

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Main Results:

  • The spliceosome in the eukaryotic ancestor likely contained most core components found in extant eukaryotes, including all small nuclear ribonucleoprotein (snRNP) proteins.
  • Both major and trans-splicing were likely present, with connections to transcription and capping.
  • No evidence supports the presence of minor (U12-dependent) splicing in the eukaryotic ancestor.

Conclusions:

  • The ancestral spliceosome was already highly complex, challenging the notion of gradual increase in complexity throughout evolution.
  • Most fundamental splicing machinery and functions were established early in eukaryotic evolution.
  • The study provides insights into the early molecular architecture of eukaryotes but does not address the 'first eukaryote'.