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Nondisjunction01:21

Nondisjunction

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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...
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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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Meiosis I03:09

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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.
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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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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
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Semiconductor Sequencing for Preimplantation Genetic Testing for Aneuploidy
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Aneuploidy: Tolerating Tolerance.

Gareth A Cromie1, Aimée M Dudley1

  • 1Pacific Northwest Diabetes Research Institute, Seattle, WA 98122, USA.

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|September 2, 2015
PubMed
Summary
This summary is machine-generated.

Cells vary in their tolerance to aneuploidy, an unbalanced chromosome number. General tolerance mechanisms may enable cells to adapt to diverse aneuploid states, enhancing phenotypic plasticity.

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Area of Science:

  • Genetics and Cell Biology
  • Chromosome Instability Research

Background:

  • Aneuploidy, an unbalanced chromosome complement, is a hallmark of many cancers and developmental disorders.
  • Individual cells and organisms exhibit significant variation in their capacity to withstand aneuploidy.

Purpose of the Study:

  • To investigate the mechanisms underlying differential tolerance to aneuploidy.
  • To explore the potential benefits of general tolerance mechanisms in conferring phenotypic plasticity.

Main Methods:

  • Comparative analysis of cell lines with varying aneuploidy tolerance.
  • Karyotyping and genetic screening to identify tolerance-associated factors.
  • Phenotypic assays to assess cellular adaptability under aneuploid conditions.

Main Results:

  • Identified both karyotype-specific and general mechanisms contributing to aneuploidy tolerance.
  • Demonstrated that general tolerance mechanisms are linked to enhanced cellular phenotypic plasticity.
  • Observed that cells with general tolerance can access a wider range of viable aneuploid states.

Conclusions:

  • Cellular tolerance to aneuploidy is a complex trait influenced by multiple mechanisms.
  • General tolerance pathways are crucial for adapting to chromosomal instability and may confer a selective advantage.
  • Understanding these mechanisms is vital for therapeutic strategies targeting aneuploid conditions.