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Detection of Nuclear Blebbing and DNA Leakage in Mammalian Cells by Immunofluorescence
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A lamin in lower eukaryotes?

Petros Batsios1, Tatjana Peter, Otto Baumann

  • 1Department of Cell Biology, Institute for Biochemistry and Biology, University of Potsdam, Potsdam-Golm, Germany.

Nucleus (Austin, Tex.)
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Summary
This summary is machine-generated.

Dictyostelium NE81 is the first identified lamin-like protein in lower eukaryotes, crucial for nuclear envelope organization. Its evolution likely coincided with the emergence of multicellularity in these organisms.

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Biochemistry

Background:

  • Lamins are essential nuclear lamina components in metazoans, involved in mechanical support, chromatin organization, and gene regulation.
  • Lamins have historically been considered exclusive to metazoans.
  • The discovery of Dictyostelium NE81 challenges this view, representing the first lamin-like protein found in a lower eukaryote.

Purpose of the Study:

  • To model nuclear envelope organization in Dictyostelium based on the identification of NE81.
  • To review experimental evidence supporting NE81's classification as a lamin-like protein.
  • To investigate the evolutionary relationship between NE81 and metazoan lamins.

Main Methods:

  • Identification and characterization of Dictyostelium NE81.
  • Analysis of experimental data on NE81 function and localization.
  • Sequence comparison of NE81 with bona fide lamins.
  • Investigation of posttranslational CaaX-box processing for protein localization.

Main Results:

  • Dictyostelium NE81 is classified as the first lamin-like protein in a lower eukaryote.
  • Posttranslational CaaX-box processing is essential for NE81's proper localization to the nuclear envelope.
  • Sequence comparisons reveal evolutionary links between NE81 and metazoan lamins.

Conclusions:

  • A model for nuclear envelope organization in Dictyostelium involving NE81 is proposed.
  • The evolution of lamin-like proteins may be linked to the development of multicellularity.
  • NE81 provides insights into the early evolution of nuclear lamina components.