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Related Concept Videos

Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Updated: Jul 7, 2026

Analysis of the Expression and Complexes Assembly of the Mitochondrial Respiratory Chain Proteins in the Fission Yeast Schizosaccharomyces pombe
08:07

Analysis of the Expression and Complexes Assembly of the Mitochondrial Respiratory Chain Proteins in the Fission Yeast Schizosaccharomyces pombe

Published on: May 2, 2025

Multiple pathways influence mitochondrial inheritance in budding yeast.

Rebecca L Frederick1, Koji Okamoto, Janet M Shaw

  • 1Department of Biochemistry, University of Utah, Salt Lake City, Utah 84112, USA.

Genetics
|February 5, 2008
PubMed
Summary
This summary is machine-generated.

Yeast cells use multiple pathways for mitochondrial inheritance, involving Gem1p, Mmr1p, and Ypt11p proteins. These proteins independently regulate mitochondrial distribution, with Ypt11p also influencing endoplasmic reticulum distribution.

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Mitochondrial Transformation in Baker's Yeast to Study Translation and Respiratory Complex Assembly

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Area of Science:

  • Cell Biology
  • Genetics
  • Mitochondrial Biology

Background:

  • Yeast mitochondria form a dynamic, branched tubular network essential for cellular function.
  • Mitochondrial inheritance is critical for daughter cell viability, coupled with cell division.
  • Key proteins like Gem1p (Miro GTPase), Mmr1p, and Ypt11p are implicated in mitochondrial inheritance.

Purpose of the Study:

  • To investigate the roles of Gem1p, Mmr1p, and Ypt11p in yeast mitochondrial inheritance.
  • To explore the relationship between mitochondrial and endoplasmic reticulum (ER) distribution.
  • To elucidate the functional independence and coordination of proteins involved in organelle inheritance.

Main Methods:

  • Synthetic genetic array (SGA) screening to identify gene interactions.
  • Analysis of double mutants (e.g., gem1Δ mmr1Δ) for synthetic sickness and defective mitochondrial inheritance.
  • Overexpression studies of Mmr1p and Ypt11p to assess their effects on mitochondrial and ER distribution.
  • Microscopy to observe mitochondrial and ER morphology and localization in yeast buds.

Main Results:

  • gem1Δ and mmr1Δ mutations exhibit synthetic sickness and defective mitochondrial inheritance in large buds.
  • Gem1p, Mmr1p, and Ypt11p independently contribute to mitochondrial inheritance.
  • Mitochondrial accumulation in buds upon Mmr1p or Ypt11p overexpression is independent of Gem1p.
  • Yeast mitochondrial inheritance is not essential for ER inheritance or spreading.
  • Ypt11p overexpression, but not Mmr1p, leads to ER accumulation in buds, suggesting a role in ER distribution.

Conclusions:

  • Multiple, independent pathways involving Gem1p, Mmr1p, and Ypt11p regulate yeast mitochondrial inheritance.
  • Miro GTPases play conserved roles in mitochondrial distribution.
  • Ypt11p may have a dual role in both mitochondrial and ER distribution.
  • Mitochondrial and ER inheritance are not strictly coordinated, challenging previous hypotheses.