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Related Concept Videos

Mitochondria01:37

Mitochondria

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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,...
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Electron Transport Chain: Complex I and II01:46

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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ATP Synthase: Mechanism01:48

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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...
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Inborn Errors of Metabolism01:20

Inborn Errors of Metabolism

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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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Mitochondrial Membranes01:45

Mitochondrial Membranes

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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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Chemiosmosis01:32

Chemiosmosis

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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
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Endocrine Dysfunction in Primary Mitochondrial Diseases.

Rachel Varughese1, Shamima Rahman2,3

  • 1Department of Endocrinology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK.

Endocrine Reviews
|February 1, 2025
PubMed
Summary
This summary is machine-generated.

Primary mitochondrial disorders (PMD) impact hormone production and secretion. Endocrine dysfunction, including diabetes and growth hormone deficiency, is common in PMD patients, requiring high clinical suspicion for diagnosis and treatment.

Keywords:
Kearns-Sayre syndromePerrault syndromeadrenal insufficiencymaternally inherited diabetes and deafnesspremature ovarian insufficiencyprimary mitochondrial disease

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Area of Science:

  • Endocrinology
  • Genetics
  • Mitochondrial Biology

Background:

  • Primary mitochondrial disorders (PMD) are genetic conditions affecting mitochondrial structure and function.
  • Mitochondria are crucial for energy production, hormone synthesis (steroidogenesis), and overall metabolic regulation.

Purpose of the Study:

  • To review the endocrine manifestations of PMD.
  • To discuss underlying disease mechanisms, diagnosis, and treatment approaches for these complex disorders.

Main Methods:

  • This is a narrative review synthesizing current literature on endocrine aspects of PMD.

Main Results:

  • Diabetes mellitus is the most frequent endocrine complication of PMD.
  • Other potential endocrine issues include growth hormone deficiency, adrenal insufficiency, hypogonadism, and parathyroid dysfunction.
  • Thyroid dysfunction has limited evidence of a causal link to PMD.

Conclusions:

  • Endocrine dysfunction is a significant feature of PMD, varying by specific disorder and affected gland.
  • Early diagnosis of PMD in patients with endocrine symptoms, and vice versa, is critical.
  • Novel therapeutics are emerging, but clinical translation faces challenges.