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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...
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...
Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes

The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...

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An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model
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[Is it possible to generate artificial mitochondrial genome?]

Ken-Ichi Wada1,2

  • 1Institute for Materials Chemistry and Engineering, Kyushu University.

Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica
|July 1, 2026
PubMed
Summary

Researchers developed a novel microfluidic device for precise mitochondrial DNA (mtDNA) transfer, enabling potential mtDNA writing and new gene therapies for mtDNA-related diseases.

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Area of Science:

  • Mitochondrial biology
  • Genetics
  • Biotechnology

Background:

  • Mitochondrial DNA (mtDNA) is crucial for cellular energy production (ATP) via oxidative phosphorylation.
  • mtDNA mutations are linked to numerous diseases, making mtDNA-targeted gene therapies highly desirable.
  • Current methods for manipulating mtDNA are limited, hindering therapeutic development.

Purpose of the Study:

  • To introduce mtDNA writing, a technology for unrestricted and precise mtDNA manipulation.
  • To establish specialized host cells (e-mt cells) capable of accepting exogenous mtDNA.
  • To develop a novel method for creating e-mt cells.

Main Methods:

  • Hypothesized that specialized host cells (e-mt cells) are key to mtDNA writing.
  • Developed a novel microfluidic device for direct, non-invasive mitochondrial transfer between single cells.
  • Utilized microfluidic fusion through micro apertures (microslit/microtunnel).

Main Results:

  • Successfully demonstrated single-mitochondrion transfer using the microfluidic device.
  • Achieved cybrid generation via mitochondrial transfer into ρ0 cells.
  • The microfluidic device shows potential for homoplasmic mtDNA modification through mtDNA cloning.

Conclusions:

  • The developed microfluidic device is a promising tool for mtDNA manipulation.
  • This technology is expected to contribute to the creation of e-mt cells for mtDNA writing.
  • Advances in mtDNA manipulation could lead to novel therapeutic strategies for mtDNA-associated disorders.