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Related Concept Videos

Cross-bridge Cycle01:26

Cross-bridge Cycle

As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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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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Cardiomyopathy IV: Restrictive Cardiomyopathy

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Related Experiment Video

Updated: May 13, 2026

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

E F Gilbert

    Pathology
    |April 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Carnitine is vital for fatty acid metabolism, transporting lipids into mitochondria. Carnitine deficiency causes harmful lipid buildup, but carnitine therapy can effectively treat related muscle and systemic conditions.

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    Published on: March 23, 2022

    Area of Science:

    • Biochemistry
    • Cellular Metabolism
    • Human Physiology

    Background:

    • Carnitine is crucial for long-chain fatty acid transport across the inner mitochondrial membrane, enabling beta-oxidation.
    • It is synthesized from lysine and methionine, with butyrobetaine hydroxylation in the liver, brain, and kidney producing carnitine.
    • Carnitine is distributed via plasma to tissues like the heart and skeletal muscle, vital for energy production.

    Purpose of the Study:

    • To review the role of carnitine in fatty acid metabolism and mitochondrial function.
    • To describe the clinical manifestations and ultrastructural pathology of carnitine deficiency.
    • To evaluate the therapeutic efficacy of carnitine supplementation in various deficiency forms.

    Main Methods:

    • Literature review of carnitine metabolism, deficiency syndromes, and therapeutic outcomes.
    • Analysis of clinical case studies and biochemical data related to carnitine deficiency.
    • Examination of ultrastructural changes in muscle and myocardial tissues affected by carnitine deficiency.

    Main Results:

    • Carnitine deficiency leads to neutral lipid accumulation in skeletal muscle, myocardium, and liver.
    • Ultrastructural analysis reveals myofibril disruption and mitochondrial aggregation in affected tissues.
    • Carnitine therapy demonstrates efficacy in treating myopathic, systemic, and mixed forms of carnitine deficiency.

    Conclusions:

    • Carnitine plays an indispensable role in cellular energy metabolism through fatty acid oxidation.
    • Carnitine deficiency presents with distinct clinical and pathological features, impacting muscle and cardiac function.
    • Carnitine supplementation is an effective treatment for various carnitine deficiency syndromes, including secondary forms.