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Nondisjunction

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.

Nondisjunction

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...

Nondisjunction

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.

The Spindle Assembly Checkpoint

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...

The Spindle Assembly Checkpoint

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...

Crossing Over

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...

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Related Experiment Video

Updated: May 23, 2026

Rapid Analysis of Chromosome Aberrations in Mouse B Lymphocytes by PNA-FISH

Rapid Analysis of Chromosome Aberrations in Mouse B Lymphocytes by PNA-FISH

Published on: August 19, 2014

SPOC alert--when chromosomes get the wrong direction.

Ayse Koca Caydasi¹, Gislene Pereira

¹Molecular Biology of Centrosomes and Cilia, German Cancer Research Center, DKFZ-ZMBH Alliance, Heidelberg, Germany.

Experimental Cell Research

|April 19, 2012

Summary

Budding yeast uses the spindle position checkpoint (SPOC) to prevent mitotic exit when the mitotic spindle misaligns. This ensures accurate chromosome segregation by controlling the mitotic exit network (MEN).

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Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations

Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations

Published on: September 20, 2019

Area of Science:

Cell Biology
Molecular Biology
Genetics

Background:

Asymmetric cell division in budding yeast requires precise mitotic spindle alignment for faithful chromosome segregation.
The spindle position checkpoint (SPOC) is a surveillance mechanism that halts mitosis upon spindle misalignment.
The mitotic exit network (MEN) pathway, regulated by SPOC, controls cell cycle progression and exit from mitosis.

Purpose of the Study:

To review the mechanisms of mitotic exit in budding yeast.
To focus on the regulation of the MEN pathway by the SPOC.
To discuss potential existence of similar checkpoints in higher eukaryotes.

Main Methods:

Literature review of existing research on budding yeast cell division.
Analysis of molecular mechanisms governing SPOC and MEN.
Comparative discussion of cell division checkpoints across eukaryotes.

Main Results:

SPOC inhibits MEN to prevent premature mitotic exit when spindle alignment fails.
MEN activation leads to Cdc14 phosphatase activity, promoting mitotic exit.
Recent advances illuminate SPOC regulation and its components.

Conclusions:

The SPOC is crucial for maintaining genomic stability in asymmetric cell divisions.
Understanding SPOC-MEN interaction provides insights into cell cycle control.
Further research is needed to determine if analogous checkpoints exist in higher eukaryotes.