Unconventional model organisms bend our view on mitochondrial cristae

Area of Science:

• Mitochondrial biology
• Eukaryotic cell structure
• Parasitology

Background:

• Cristae, inner mitochondrial membrane folds, increase surface area for ATP synthesis.
• Research on cristae structure is limited to model organisms, neglecting eukaryotic diversity.
• Euglenozoa and Alveolata represent divergent clades with medically important parasites.

Purpose of the Study:

• To provide a comprehensive overview of crista formation and maintenance in Euglenozoa and Alveolata.
• To compare cristae diversity across eukaryotes, focusing on conserved and unique traits.
• To synthesize a general model for crista formation principles.

Main Methods:

• Comparative analysis of crista structure and formation.
• Review of existing literature on cristae in Euglenozoa, Alveolata, and traditional model organisms.
• Focus on the roles of ATP synthase, MICOS, and cardiolipin in crista curvature.

Main Results:

• Cristae exhibit significant diversity across eukaryotic clades.
• Conserved and unique mechanisms govern crista formation and maintenance.
• ATP synthase, MICOS, and cardiolipin are key regulators of crista curvature.

Conclusions:

• A broadly applicable model for general principles of crista formation can be synthesized by comparing distantly related organisms.
• Understanding crista diversity is crucial for comprehending mitochondrial function in various eukaryotes, including parasites.
• This review highlights the importance of studying underrepresented eukaryotic clades for a complete picture of mitochondrial biology.