Related Experiment Video

Updated: Jul 15, 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

Mitochondrial DNA-related disorders

Michelangelo Mancuso1, Massimiliano Filosto, Anna Choub

  • 1Department of Neuroscience, University of Pisa, Via Roma 67, Pisa, 56126, Italy. mmancuso@inwind.it

Bioscience Reports
|May 8, 2007
PubMed

Insights

Mitochondrial diseases stem from respiratory chain defects, linked to mitochondrial (mtDNA) or nuclear (nDNA) DNA. This review updates classifications and outlines clinical features of these complex genetic disorders.

Area of Science:

  • Genetics
  • Molecular Biology
  • Neurology

Background:

  • Mitochondrial diseases result from mitochondrial respiratory chain deficiencies.
  • These disorders can be caused by mutations in mitochondrial DNA (mtDNA) or nuclear DNA (nDNA).
  • mtDNA-related disorders present diverse clinical phenotypes, from myopathy to multi-systemic conditions.

Purpose of the Study:

  • To provide an updated classification of mitochondrial diseases.
  • To review the main clinical presentations of mtDNA-related disorders.
  • To highlight the genetic complexity and clinical heterogeneity.

Main Methods:

  • Literature review of current classifications and clinical data.
  • Analysis of genetic causes (mtDNA and nDNA).
  • Phenotypic characterization of various mitochondrial disorders.

Main Results:

  • Over 250 pathogenic changes in mtDNA are linked to various clinical pictures.
  • Many cases exhibit polymorphous phenotypes, ranging from isolated myopathy to multi-systemic involvement.
  • Genetic complexity contributes to significant intra- and inter-familial clinical heterogeneity.

Conclusions:

  • Mitochondrial diseases represent a heterogeneous group of disorders with complex genetic underpinnings.
  • Accurate classification and understanding of clinical phenotypes are crucial for diagnosis and management.
  • Further research is needed to unravel the full spectrum of mitochondrial genetic disorders.

More Related Videos

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry06:53

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry

Published on: November 23, 2011

Transmitochondrial Cybrid Generation Using Cancer Cell Lines07:49

Transmitochondrial Cybrid Generation Using Cancer Cell Lines

Published on: March 17, 2023

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...
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,...
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,...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...