Related Experiment Video

Updated: Aug 22, 2026

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model
06:05

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model

Published on: March 9, 2022

In vivo interaction between mitochondria carrying mtDNAs from different mouse species

Akitsugu Sato1, Kazuto Nakada, Hiroshi Shitara

  • 1Institute of Biological Sciences, University of Tsukuba, Ibaraki 305-8572, Japan.

Genetics
|September 3, 2004
PubMed

Insights

Mitochondrial DNA (mtDNA) deletion mutants were transmitted through generations in mice, unlike wild-type mtDNA. This transmission offered protection against mitochondrial dysfunction, highlighting interactions between different mtDNA types.

Area of Science:

  • Mitochondrial genetics
  • Mouse models of disease
  • Cellular respiration

Background:

  • Mitochondrial DNA (mtDNA) plays a crucial role in cellular energy production.
  • Understanding mtDNA transmission and its impact on mitochondrial function is vital for disease research.
  • Mitochondrial disease model mice (mitomice) are valuable tools for studying these processes.

Purpose of the Study:

  • To investigate the transmission patterns of exogenous wild-type and deletion mutant mitochondrial DNA (DeltamtDNA) in mitomice.
  • To determine the impact of exogenous mtDNA on mitochondrial function and respiration defects.
  • To explore the interaction between exogenous and endogenous mitochondrial DNA within mitomice.

Main Methods:

  • Creation of mitomice using zygotes from B6mtspr mice and exogenous mitochondria with wild-type or DeltamtDNA from M. musculus domesticus.
  • Analysis of mtDNA transmission through the female germ line across generations (F3).
  • Assessment of respiration defects and protection mechanisms in mitomice tissues.

Main Results:

  • Exogenous DeltamtDNA was transmitted to subsequent generations, while exogenous wild-type mtDNA was eliminated.
  • Smaller size of DeltamtDNA conferred a propagational advantage for transmission.
  • Mitomice carrying DeltamtDNA showed protection from respiration defects, aided by endogenous M. spretus wild-type mtDNA.

Conclusions:

  • Exogenous DeltamtDNA transmission is favored over wild-type mtDNA due to size-related advantages.
  • Endogenous wild-type mtDNA can protect against mitochondrial dysfunction in the presence of exogenous DeltamtDNA.
  • Evidence of interaction between exogenous DeltamtDNA-carrying mitochondria and endogenous wild-type mtDNA was established.

More Related Videos

MitoCeption: Transferring Isolated Human MSC Mitochondria to Glioblastoma Stem Cells11:13

MitoCeption: Transferring Isolated Human MSC Mitochondria to Glioblastoma Stem Cells

Published on: February 22, 2017

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...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
In-vitro Mutagenesis01:16

In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
Export of Mitochondrial and Chloroplast Genes02:19

Export of Mitochondrial and Chloroplast Genes

A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred irrespective...