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Related Experiment Videos

The cryptomonad histone H4-encoding gene: structure and chromosomal localization

S B Müller1, S A Rensing, U G Maier

  • 1Institut für Biologie II, Zellbiologie, Freiburg, Germany.

Gene
|December 15, 1994
PubMed
Summary

Histone H4 is absent in the nucleomorph of cryptomonads, suggesting it is a vestigial nucleus. Cryptomonad H4 genes show an intermediate evolutionary position between animals and plants.

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Area of Science:

  • * Molecular Biology
  • * Cell Biology
  • * Evolutionary Biology

Background:

  • * Cryptomonads are unicellular flagellates with complex plastids enclosed by four membranes.
  • * A periplastidal compartment contains a nucleomorph, identified as the remnant nucleus of a eukaryotic endosymbiont.
  • * Understanding the nucleomorph's chromatin structure is crucial for evolutionary studies.

Purpose of the Study:

  • * To investigate the chromatin composition of the cryptomonad nucleomorph and host nuclear chromosomes.
  • * To determine the presence and distribution of histone H4 in the nucleomorph.
  • * To analyze the evolutionary placement of cryptomonad H4 genes.

Main Methods:

  • * Immunolocalization of histone H4.
  • * Southern hybridization to detect H4 DNA.

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  • * Sequence analysis of the cryptomonad H4 gene.
  • * Southern and Northern blot analyses.

    • Main Results:

    • * Histone H4 was undetectable in the nucleomorph via immunolocalization.
    • * H4 DNA was not demonstrable in the nucleomorph using Southern hybridization.
    • * Sequence and blot data indicated cryptomonad H4 genes are evolutionarily intermediate between animal and plant genes.

    Conclusions:

    • * The nucleomorph of cryptomonads lacks histone H4, supporting its nature as a vestigial nucleus.
    • * Cryptomonad H4 genes occupy an intermediate evolutionary position, offering insights into early eukaryotic evolution.
    • * Further research into nucleomorph genetics can illuminate endosymbiotic events and genome reduction.