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Membrane heredity and early chloroplast evolution.

T Cavalier-Smith1

  • 1Dept of Zoology, University of Oxford, UK. tom.cavalier-smith@zoo.ox.ac.uk

Trends in Plant Science
|March 31, 2000
PubMed
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Membrane heredity drove chloroplast origin from cyanobacteria and subsequent plastid transfers. This process integrated diverse genomes and membranes, creating complex photosynthetic organisms.

Area of Science:

  • * Evolutionary biology
  • * Molecular biology
  • * Cell biology

Background:

  • * Chloroplasts originated from cyanobacteria via symbiogenesis in the ancestor of Plantae.
  • * Plastids have been laterally transferred, leading to complex chimeric photosynthetic organisms.
  • * Early eukaryotic cells evolved mechanisms for protein import into plastids.

Purpose of the Study:

  • * To explore the role of membrane heredity in plastid evolution.
  • * To investigate the development of protein import machinery in early Plantae.
  • * To analyze signal sequence evolution during secondary symbiogenesis.

Main Methods:

  • * Comparative analysis of genetic membranes and genomes.
  • * Reconstruction of evolutionary pathways for plastid protein targeting.

Related Experiment Videos

  • * Examination of signal sequence diversity across different algal lineages.

    • Main Results:

    • * Membrane heredity was crucial for initial chloroplast integration and subsequent plastid transfers.
    • * The common ancestor of Plantae developed protein import machinery for plastids.
    • * Signal sequences evolved independently to target proteins across host perialgal membranes in secondary symbiogenesis.

    Conclusions:

    • * Membrane heredity is a fundamental mechanism in plastid evolution and diversification.
    • * The evolution of protein import systems facilitated the integration of endosymbionts.
    • * Independent evolution of targeting signals highlights the adaptability of plastid systems.