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Related Experiment Videos

Plastid division: its origins and evolution.

Haruki Hashimoto1

  • 1Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo 153-8902, Japan.

International Review of Cytology
|December 31, 2002
PubMed
Summary
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Plastid division evolved complex mechanisms from cyanobacteria and host eukaryotes. These mechanisms, including the plastid-dividing (PD) ring, ensure faithful DNA transmission during cell division.

Area of Science:

  • * Cell Biology
  • * Evolutionary Biology
  • * Photosynthesis Research

Background:

  • * Photosynthetic eukaryotes possess plastids, organelles acquired via endosymbiosis.
  • * The evolutionary origins of plastid division mechanisms are intricate and multifaceted.
  • * Plastid division involves components derived from both ancestral cyanobacteria and eukaryotic hosts.

Purpose of the Study:

  • * To elucidate the complex evolutionary origins of plastid division machinery.
  • * To understand the roles of different components in plastid and cyanelle division.
  • * To explore the mechanisms of nucleoid partitioning and DNA transmission during plastid division.

Main Methods:

  • * Comparative analysis of plastid division components across different eukaryotic lineages.

Related Experiment Videos

  • * Examination of cyanelle division in relation to bacterial cell division.
  • * Review of existing hypotheses on primary and secondary endosymbiosis and their impact on plastid evolution.

    • Main Results:

    • * Plastid division utilizes the FtsZ ring (from cyanobacteria) and concentric plastid-dividing (PD) rings (from host eukaryotes).
    • * Cyanelles exhibit division via septum formation and a cyanelle ring, resembling bacterial division.
    • * Plastid nucleoid partitioning may involve membrane binding, facilitating DNA transmission during binary division.

    Conclusions:

    • * Plastid division mechanisms are a mosaic of endosymbiotic and host-derived components.
    • * Cyanelle division represents a potential intermediate evolutionary stage.
    • * The division of secondary plastids involves PD rings for inner membranes, with outer membrane division mechanisms remaining unclear.