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Related Concept Videos

Meiosis I01:49

Meiosis I

Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
Complications of Diabetes Mellitus01:22

Complications of Diabetes Mellitus

Diabetes mellitus is a chronic metabolic disorder characterized by persistent hyperglycemia due to insulin deficiency, resistance, or both. Prolonged hyperglycemia disrupts metabolic homeostasis and leads to acute and chronic complications.Acute ComplicationsAcute complications result from sudden metabolic imbalance.Diabetic ketoacidosis (DKA) mainly appears in type 1 diabetes but may also develop in type 2 diabetes, particularly under extreme stress. It arises from severe insulin deficiency,...
Diabetic Neuropathy01:22

Diabetic Neuropathy

DefinitionDiabetic neuropathy is nerve damage caused by long-standing diabetes mellitus. It results directly from prolonged high blood sugar levels.PathophysiologyThe pathophysiology of diabetic neuropathy involves both metabolic and vascular disturbances triggered by chronic hyperglycemia.Metabolic injury: Elevated glucose levels activate the polyol pathway within nerve cells, leading to the accumulation of sorbitol and fructose. This increases oxidative stress, disrupts normal nerve...
Disorders of the Nervous Tissue01:28

Disorders of the Nervous Tissue

Nervous tissue is a vital component of the human body's communication system, enabling us to perceive and respond to stimuli. However, like all other tissues, it is vulnerable to disorders and diseases that can significantly impact our neurological functioning.
Homeostatic Imbalances:
Alzheimer's disease manifests as a gradual decline in memory and cognitive abilities, attributed to the buildup of amyloid plaques and neurofibrillary tangles in the brain.
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Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Nondisjunction01:29

Nondisjunction

During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.

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Related Experiment Video

Updated: Jul 6, 2026

In Vitro Modeling of Down Syndrome Neurogenesis Using Human-Induced Pluripotent Stem Cells
06:38

In Vitro Modeling of Down Syndrome Neurogenesis Using Human-Induced Pluripotent Stem Cells

Published on: March 7, 2025

[Neurological complications in Down syndrome].

A Chaanine1, C Hugonenq, G Lena

  • 1Service de neurologie pédiatrique, CHU de la Timone-Enfants, Marseille cedex 5, France.

Archives De Pediatrie : Organe Officiel De La Societe Francaise De Pediatrie
|March 11, 2008
PubMed
Summary

Neurological complications in Down syndrome, including West syndrome and C1-C2 dislocation, can be effectively treated. Early intervention improves outcomes for epilepsy and vertebral issues in these patients.

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Last Updated: Jul 6, 2026

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Published on: November 3, 2016

Area of Science:

  • Neurology
  • Genetics

Context:

  • Down syndrome is associated with a higher incidence of neurological disorders.
  • Understanding these complications is crucial for patient management.

Purpose:

  • To investigate the spectrum of neurological disorders in patients with Down syndrome.
  • To evaluate the outcomes of various treatments for these conditions.

Summary:

  • A review of 12 hospitalized patients with Down syndrome revealed common neurological issues including epilepsy (West syndrome, partial epilepsy), ischemic lesions (Moya-Moya syndrome), and C1-C2 vertebral dislocation.
  • All epilepsy cases achieved seizure freedom with treatment. Surgical intervention was successful for vertebral dislocations. Neurological sequelae were noted in one epilepsy patient.

Impact:

  • West syndrome is the most common epilepsy type in Down syndrome, with favorable outcomes if treated early.
  • Prompt investigation of vascular lesions and systematic screening for C1-C2 dislocation due to hyperlaxity are essential to prevent neurological complications.