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Related Concept Videos

Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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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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Meiosis I01:49

Meiosis I

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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...
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Nondisjunction01:29

Nondisjunction

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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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Nondisjunction01:21

Nondisjunction

5.3K
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...
5.3K
Meiosis II02:02

Meiosis II

50.7K
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
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Crossing Over01:34

Crossing Over

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
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Live Cell Imaging of Chromosome Segregation During Mitosis
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Live Cell Imaging of Chromosome Segregation During Mitosis

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Interrogating cell division errors using random and chromosome-specific missegregation approaches.

Peter Ly1, Don W Cleveland1

  • 1a Ludwig Institute for Cancer Research and Department of Cellular and Molecular Medicine , University of California at San Diego , La Jolla , CA , USA.

Cell Cycle (Georgetown, Tex.)
|June 27, 2017
PubMed
Summary
This summary is machine-generated.

Accurate genome segregation during cell division is crucial for genetic stability. New tools enable specific Y chromosome missegregation, aiding the study of chromosome instability and its link to diseases like cancer.

Keywords:
aneuploidycentromerechromosome segregationchromothripsismicronucleimitosis

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Accurate genome segregation in mitosis is vital for genetic stability.
  • Errors lead to chromosome abnormalities, linked to cancer and developmental disorders.
  • Existing methods for studying chromosome segregation errors are limited.

Purpose of the Study:

  • To describe tools for studying chromosome segregation errors, aneuploidy, and micronuclei.
  • To discuss the application of a Y-specific missegregation system.
  • To explore how micronucleation triggers chromothripsis.

Main Methods:

  • Development of a cell-based system for inducible Y chromosome missegregation.
  • Selective disruption of kinetochore assembly on the Y centromere.
  • Utilizing tools to study chromosome segregation errors, aneuploidy, and micronuclei.

Main Results:

  • The Y-specific missegregation system is efficient, specific, and does not affect other chromosomes.
  • This system allows elucidation of how micronucleation triggers chromothripsis.
  • The tools facilitate the study of cell division defects and chromosomal instability.

Conclusions:

  • A Y-specific chromosome missegregation system provides a powerful tool for studying genetic instability.
  • Combinatorial use of these tools advances the understanding of cell division defects.
  • This research sheds light on the mechanisms underlying cancer and developmental disorders.