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Related Concept Videos

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,...
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...
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,...

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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
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[Mitochondrial disorders].

Arnold Munnich1, Pascale de Lonlay, Agnès Rötig

  • 1Pédiatrie, Hôpital Necker-Enfants malades, INSERM U393, 149 rue de Sèvres, 75743 Paris.

Bulletin De L'Academie Nationale De Medecine
|September 2, 2009
PubMed
Summary
This summary is machine-generated.

Mitochondrial disorders affect ATP synthesis and can impact multiple organs, with diagnosis requiring metabolic, biochemical, and genetic analysis. Understanding these complex genetic origins is key to diagnosis and treatment.

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Area of Science:

  • Biochemistry
  • Genetics
  • Cell Biology

Context:

  • The mitochondrial respiratory chain synthesizes ATP, essential for all cell types.
  • Mitochondrial disorders exhibit significant clinical variability due to the respiratory chain's ubiquitous presence.
  • These disorders can affect multiple organs or present with isolated involvement, with onset varying throughout life.

Purpose:

  • To explore the metabolic, biochemical, and genetic underpinnings of mitochondrial disorders.
  • To highlight diagnostic approaches including metabolic investigations and enzymatic/molecular studies.
  • To elucidate the genetic origins of abnormal oxidative phosphorylation.

Summary:

  • Mitochondrial disorders disrupt ATP synthesis, impacting various organs with diverse clinical presentations.
  • Diagnosis involves metabolic screening (e.g., lactic acidosis) and confirmation via enzymatic and molecular analyses of respiratory chain complexes.
  • Genetic defects can arise from mitochondrial DNA (mtDNA) mutations (point mutations, deletions) or nuclear gene mutations affecting respiratory chain function.

Impact:

  • Provides a comprehensive overview of mitochondrial disorder diagnosis and etiology.
  • Emphasizes the importance of integrated diagnostic strategies combining metabolic, biochemical, and genetic assessments.
  • Contributes to understanding the complex genetic basis of oxidative phosphorylation defects.