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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...
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,...
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,...
Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
Inborn Errors of Metabolism01:20

Inborn Errors of Metabolism

Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...

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Related Experiment Video

Updated: Jun 27, 2026

Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
07:47

Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy

Published on: July 9, 2016

Mitochondrial disorders: clinical and genetic features.

D K Simon1, D R Johns

  • 1Department of Neurology, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02115, USA.

Annual Review of Medicine
|March 12, 1999
PubMed
Summary

Mitochondrial DNA mutations cause diverse disorders affecting energy production. Recognizing these syndromes and understanding mitochondrial genetics is crucial for diagnosis and counseling.

Area of Science:

  • Cellular Biology
  • Genetics
  • Neurology

Background:

  • Mitochondrial oxidative phosphorylation is vital for human cellular energy production.
  • Mitochondrial DNA (mtDNA) mutations lead to a wide spectrum of clinical disorders.
  • Specific tissues are highly vulnerable to mitochondrial dysfunction, manifesting distinct syndromes.

Purpose of the Study:

  • To highlight the diverse clinical manifestations of mitochondrial DNA mutations.
  • To emphasize the role of mtDNA mutations in aging and neurodegenerative diseases.
  • To underscore the importance of recognizing mitochondrial disorders in clinical practice.

Main Methods:

  • Clinical case review and literature synthesis.
  • Analysis of genetic inheritance patterns in mitochondrial diseases.

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Histological Examination of Mitochondrial Morphology in a Parkinson's Disease Model

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Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models
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Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models

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Related Experiment Videos

Last Updated: Jun 27, 2026

Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
07:47

Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy

Published on: July 9, 2016

Histological Examination of Mitochondrial Morphology in a Parkinson's Disease Model
06:07

Histological Examination of Mitochondrial Morphology in a Parkinson's Disease Model

Published on: June 23, 2023

Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models
08:48

Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models

Published on: June 30, 2023

  • Correlation of genotype with phenotype in affected individuals.
  • Main Results:

    • mtDNA mutations are associated with seizures, stroke, myopathy, neuropathy, and diabetes mellitus.
    • These mutations are implicated in aging and neurodegenerative conditions like Parkinson's disease.
    • Recognizable clinical syndromes arise from tissue-specific susceptibility to mitochondrial dysfunction.

    Conclusions:

    • Clinicians must be adept at identifying syndromes indicative of mitochondrial disorders.
    • The unique genetics of mitochondria present diagnostic and counseling challenges.
    • Understanding mitochondrial genetics is essential for effective patient management.