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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...
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...
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.
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.
Nondisjunction01:21

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
Chromosomal Theory of Inheritance01:39

Chromosomal Theory of Inheritance

In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”

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Related Experiment Video

Updated: Jul 5, 2026

Chromosome Preparation From Cultured Cells
07:42

Chromosome Preparation From Cultured Cells

Published on: January 28, 2014

[New chromosomal syndromes].

C Schluth-Bolard1, M Till, P Edery

  • 1Service de cytogénétique constitutionnelle, hospices civils de Lyon, centre de biologie et de pathologie Est, 59, boulevard Pinel, 69677 Bron, cedex, France.

Pathologie-Biologie
|May 10, 2008
PubMed
Summary
This summary is machine-generated.

New molecular tools detect smaller chromosomal abnormalities, increasing diagnoses of developmental disorders by 15-20%. This research details eight new recurrent chromosomal syndromes, improving patient care and gene identification for neurocognitive functions.

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Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay
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Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Published on: February 6, 2012

A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations
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A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations

Published on: December 1, 2017

Related Experiment Videos

Last Updated: Jul 5, 2026

Chromosome Preparation From Cultured Cells
07:42

Chromosome Preparation From Cultured Cells

Published on: January 28, 2014

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay
06:25

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Published on: February 6, 2012

A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations
08:22

A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations

Published on: December 1, 2017

Area of Science:

  • Genetics and Genomics
  • Molecular Cytogenetics
  • Developmental Biology

Context:

  • Mental retardation affects 2-3% of the population, often linked to chromosomal abnormalities.
  • Traditional karyotyping has limited resolution (5 Mb) for detecting smaller aberrations.
  • Array comparative genomic hybridization (array CGH) enhances diagnostic capabilities for chromosomal abnormalities.

Purpose:

  • To explain the non-allelic homologous recombination (NAHR) mechanism causing recurrent microdeletions and microduplications.
  • To describe eight newly identified recurrent chromosomal syndromes.
  • To improve the diagnosis and understanding of neurocognitive gene functions.

Summary:

  • Array CGH detects smaller chromosomal abnormalities, increasing diagnostic yield by 15-20% in patients with developmental disorders.
  • Eight new recurrent chromosomal syndromes are described: four microdeletions (del 17q21.31, del 3q29, del 15q24, del 2q32.3q33) and four microduplications (dup 22q11.2, dup 7q11.23, dup 17p11.2, MECP2 duplication).
  • The NAHR mechanism is a key driver for these recurrent rearrangements.

Impact:

  • Enhanced knowledge of these syndromes will improve patient care and facilitate targeted chromosomal diagnostics.
  • Identification of involved genes will advance the understanding of neurocognitive functions.
  • Advances in molecular cytogenetics are crucial for diagnosing rare genetic disorders.