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Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models
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Diversity and reductive evolution of mitochondria among microbial eukaryotes.

Karin Hjort1, Alina V Goldberg, Anastasios D Tsaousis

  • 1Institute for Cell and Molecular Biosciences, University of Newcastle, Newcastle upon Tyne NE2 4HH, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|February 4, 2010
PubMed
Summary

Mitochondria exist in all eukaryotes, with reduced forms like hydrogenosomes and mitosomes found in parasites. Studying these diverse mitochondrial variants reveals insights into eukaryote evolution and essential organelle functions.

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Microbiology

Background:

  • All eukaryotes possess mitochondria, though many parasites and anaerobic protists have highly reduced versions.
  • These reduced organelles, such as hydrogenosomes and mitosomes, often lack genomes and ATP generation capacity.
  • Recent discoveries include organelles blurring distinctions between mitochondria, hydrogenosomes, and mitosomes, retaining mitochondrial genomes.

Purpose of the Study:

  • To explore eukaryotic diversity through the lens of mitochondrial variants.
  • To gain insights into eukaryote molecular cell biology and evolutionary pathways.
  • To understand the essential functions of mitochondria and the limits of reductive evolution.

Main Methods:

  • Comparative analysis of mitochondrial variants across eukaryotic diversity.
  • Investigating the functions and genomic content of reduced mitochondria.
  • Identifying and characterizing novel mitochondrial-like organelles in protists and parasites.

Main Results:

  • Identification of diverse mitochondrial forms, including hydrogenosomes, mitosomes, and novel intermediate organelles.
  • Demonstration that some reduced organelles retain mitochondrial genomes, challenging previous assumptions.
  • Insights into the essential, conserved functions of mitochondria despite extreme reduction.

Conclusions:

  • Mitochondrial variants are crucial for understanding eukaryote evolution and cell biology.
  • Reductive evolution of mitochondria can proceed to varying degrees while maintaining essential functions.
  • The study of mitochondrial diversity expands our definition of essential mitochondrial roles.