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Related Concept Videos

Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
iPS Cell Differentiation01:22

iPS Cell Differentiation

The ability of induced pluripotent stem cells or iPSCs to differentiate into most body cell types has stimulated repair and regenerative medicine research over the past few decades. iPSC-derived blood cells, hepatocytes, beta islet cells, cardiomyocytes, neurons, and other cell types can repair injuries or regenerate damaged tissue in diseases such as diabetes and neurodegenerative disorders.
Huntington Disease l: Introduction01:21

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Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...
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...
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Embryonic and induced pluripotent stem cells are excellent models for disease research because of their ability to self-renew and differentiate into most cell types. Somatic cells from a patient are isolated and reprogrammed into induced pluripotent stem cells or iPSCs. These iPSCs are later differentiated into the desired cell type, which mirrors the diseased cell of the patient. In this way, disease models have been created for investigating diseases such as Down syndrome, type I diabetes,...
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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...

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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

Down syndrome--recent progress and future prospects.

Frances K Wiseman1, Kate A Alford, Victor L J Tybulewicz

  • 1Department of Neurodegenerative Disease, Institute of Neurology, Queen Square, London, UK. f.wiseman@prion.ucl.ac.uk

Human Molecular Genetics
|March 20, 2009
PubMed
Summary
This summary is machine-generated.

Down syndrome (DS), caused by trisomy 21, presents variable health issues. Recent research focuses on therapies for cognitive function and understanding genotype-phenotype links for future insights.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Neuroscience

Background:

  • Down syndrome (DS) results from trisomy of chromosome 21 (Hsa21).
  • DS is linked to diverse phenotypes including cognitive impairment, heart defects, and early-onset Alzheimer's disease.
  • The variability in phenotype expression among individuals with DS remains a significant challenge.

Purpose of the Study:

  • To review recent research advancements in Down syndrome.
  • To highlight therapeutic strategies aimed at improving cognitive function in individuals with DS.
  • To discuss future research directions and emerging technologies for understanding DS.

Main Methods:

  • Review of current literature on Down syndrome research in patients and animal models.
  • Analysis of recent therapeutic advances for cognitive deficits.
  • Examination of progress in understanding Hsa21 gene content.

Main Results:

  • Significant progress has been made in understanding the gene content of Hsa21.
  • Therapeutic approaches to enhance cognitive function in DS show promise.
  • New technologies, including chromosome engineering and large-scale genotype-phenotype studies, are emerging.

Conclusions:

  • Continued research into Hsa21 gene function is crucial.
  • Advancements in therapeutic interventions offer hope for improving quality of life in DS.
  • Future studies utilizing novel models and large patient datasets will deepen the understanding of DS pathogenesis and variability.