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Related Concept Videos

Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Oogenesis01:22

Oogenesis

Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...
Ovaries01:26

Ovaries

The ovaries are roughly the size of almonds and measure approximately 2 to 3 centimeters in length. These paired structures are situated within the pelvic region and are anchored by the mesovarium—a peritoneal extension that also connects them to the wider structure of the broad ligament. The support system extends to the suspensory ligament, housing blood and lymphatic vessels. In addition, the ovarian ligament tethers the ovaries to the uterus.
On the ovarian surface, a layer of cuboidal...
Lysosomal Hydrolases01:22

Lysosomal Hydrolases

Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
Disorders of Leukocytes01:27

Disorders of Leukocytes

Leukocyte disorders can lead to either leukopenia, characterized by an abnormally low leukocyte count, or leukocytosis, marked by a very high leukocyte number.
Leukopenia may result from bone marrow disorders, autoimmune diseases, and infectious diseases. For example, conditions such as multiple myeloma and aplastic anemia can impair the bone marrow's ability to produce adequate leukocytes. Similarly, autoimmune diseases like lupus and viral infections such as HIV can prompt the immune system...
Sex-linked Disorders01:43

Sex-linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.

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Related Experiment Video

Updated: Jul 3, 2026

An In Vitro Model for the Study of Cellular Pathophysiology in Globoid Cell Leukodystrophy
07:45

An In Vitro Model for the Study of Cellular Pathophysiology in Globoid Cell Leukodystrophy

Published on: October 21, 2014

The ovarioleukodystrophy.

Stéphane Mathis1, Gert C Scheper, Nicole Baumann

  • 1University of Poitiers, CHU Poitiers, Department of Neurology, 2 rue de La Milétrie, 86021 Poitiers cedex 05, France.

Clinical Neurology and Neurosurgery
|August 6, 2008
PubMed
Summary
This summary is machine-generated.

Ovarioleukodystrophies, rare genetic disorders, link ovarian failure with white matter disease. Genetic analysis of eukaryotic initiation factor 2B (EIF2B) genes is crucial for diagnosis.

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Area of Science:

  • Neurology
  • Genetics
  • Endocrinology

Background:

  • Ovarioleukodystrophies are rare genetic disorders characterized by leukodystrophy and premature ovarian failure.
  • Some cases are linked to mutations in eukaryotic initiation factor 2B (EIF2B) genes, a form of vanishing white matter disease.

Observation:

  • A 32-year-old woman presented with neurological symptoms and extensive leukoencephalopathy on MRI.
  • She had a history of amenorrhea since age 18 and was homozygous for a specific mutation (c.338G>A/p.Arg113His) in the EIF2B5 gene.

Findings:

  • The patient experienced progressive tetraparesia within six years.
  • This case highlights a specific homozygous mutation in EIF2B5 associated with severe leukodystrophy and ovarian failure.

Implications:

  • Confirming the link between ovarian failure and leukodystrophy necessitates genetic testing of EIF2B subunit genes.
  • Early diagnosis through genetic analysis can guide management and counseling for patients with suspected ovarioleukodystrophies.