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Related Concept Videos

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...
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.
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...
Meiosis I03:09

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Separation of Sister Chromatids02:17

Separation of Sister Chromatids

At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...

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Generation and Isolation of Cell Cycle-arrested Cells with Complex Karyotypes
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Aneuploidy: cells losing their balance.

Eduardo M Torres1, Bret R Williams, Angelika Amon

  • 1David H. Koch Institute for Integrative Cancer Research, Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142, USA.

Genetics
|June 19, 2008
PubMed
Summary

Aneuploidy, an abnormal chromosome number, hinders development and is common in solid tumors. This review explores its characteristics, molecular defects, and role in cancer formation.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • Aneuploidy is defined as a deviation from the exact multiple of the haploid chromosome number.
  • This chromosomal abnormality significantly impacts organismal growth and development.
  • Aneuploidy is a frequently observed characteristic in various solid tumors.

Purpose of the Study:

  • To review the historical context of aneuploidy research.
  • To summarize the key characteristics of aneuploidy.
  • To discuss the molecular underpinnings of aneuploidy-induced defects and its potential role in tumorigenesis.

Main Methods:

  • Literature review of historical and contemporary studies on aneuploidy.
  • Synthesis of major characteristics and molecular mechanisms associated with aneuploidy.

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Last Updated: Jul 4, 2026

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  • Exploration of the relationship between aneuploidy and cancer development.

    • Main Results:

    • Aneuploidy is a significant factor affecting normal development.
    • Specific molecular defects arise from aneuploidy.
    • Aneuploidy's contribution to tumorigenesis is under investigation.

    Conclusions:

    • Aneuploidy presents a complex challenge in understanding development and disease.
    • Further research is needed to fully elucidate the role of aneuploidy in cancer.
    • Despite its negative effects, aneuploidy may play a role in tumor progression.