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Related Experiment Video

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Testing Tactile Masking between the Forearms
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Touching from a distance.

Jennifer M Holden1, Ludek Koreny, Steven Kelly

  • 1a Division of Biological Chemistry and Drug Discovery; University of Dundee, Dundee, UK.

Nucleus (Austin, Tex.)
|December 9, 2014
PubMed
Summary
This summary is machine-generated.

The nuclear pore complex (NPC) in trypanosomes, TbNup92, shares functions with yeast/animal proteins but likely evolved independently. This highlights novel protein complexes in the trypanosome nucleus, impacting our understanding of nuclear organization evolution.

Keywords:
MlpTrypanosoma bruceichromosome segregationmitosismitotic spindlenuclear basketnuclear evolutionnuclear pore complex

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Area of Science:

  • Cell Biology
  • Molecular Evolution
  • Eukaryotic Genomics

Background:

  • The nuclear pore complex (NPC) is crucial for nucleo-cytoplasmic transport, chromatin organization, and transcriptional regulation.
  • Proteomic studies indicated conserved NPC structures across eukaryotes, suggesting ancient origins.
  • However, recent findings reveal more complex evolutionary histories for specific NPC components.

Purpose of the Study:

  • To investigate the evolutionary history and function of TbNup92, a nuclear basket protein in trypanosomes.
  • To compare TbNup92 with homologous proteins (Mlp, Tpr) in yeasts and animals.
  • To understand the implications of divergent protein complexes in the trypanosome nucleus.

Main Methods:

  • Comparative genomics analysis.
  • Functional studies of TbNup92 in trypanosomes.
  • Interaction studies with the NPC and mitotic spindle.

Main Results:

  • TbNup92 performs roles similar to yeast Mlp and animal Tpr proteins.
  • Comparative genomics suggests TbNup92 and Mlp/Tpr may be analogs, not direct orthologs, due to distinct evolutionary paths.
  • Trypanosome nucleus utilizes novel or divergent protein complexes alongside conserved elements.

Conclusions:

  • The trypanosome nuclear basket protein TbNup92 has a unique evolutionary trajectory.
  • This divergence, along with other nuclear components, indicates a unique nuclear organization strategy in trypanosomatids.
  • Findings challenge the assumption of universal conservation for all NPC-associated structures and have implications for nuclear evolution.