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Related Concept Videos

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.
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.
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
Cancers Originate from Somatic Mutations in a Single Cell02:21

Cancers Originate from Somatic Mutations in a Single Cell

Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...

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Long-term Live-cell Imaging to Assess Cell Fate in Response to Paclitaxel
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Aneuploidy and tumorigenesis.

Xiao Fang1, Pumin Zhang

  • 1Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX 77030, United States.

Seminars in Cell & Developmental Biology
|March 12, 2011
PubMed
Summary
This summary is machine-generated.

Aneuploidy, or abnormal chromosome numbers, often arises from errors in cell division. This condition is linked to cancer development, highlighting the importance of mechanisms ensuring accurate chromosome segregation.

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Area of Science:

  • Oncology
  • Cell Biology
  • Genetics

Background:

  • Aneuploidy, characterized by abnormal chromosome numbers, is a common feature in cancer cells.
  • It typically results from errors during cell division (mitosis), particularly defects in chromosome segregation.
  • The spindle assembly checkpoint (SAC) is a critical mechanism for ensuring accurate chromosome segregation.

Purpose of the Study:

  • To review the causes of aneuploidy.
  • To discuss the cellular responses to aneuploidy.
  • To explore the role of aneuploidy in tumorigenesis.

Main Methods:

  • Literature review of studies on aneuploidy and cancer.
  • Analysis of the spindle assembly checkpoint (SAC) function.
  • Examination of cellular responses to chromosomal abnormalities.

Main Results:

  • Defects in mitotic error correction, like SAC dysfunction, lead to aneuploidy.
  • SAC-deficient models exhibit increased tumor susceptibility, indicating aneuploidy's role in cancer initiation.
  • Cellular responses to aneuploidy can influence tumor progression.

Conclusions:

  • Aneuploidy is a significant driver of tumorigenesis.
  • Understanding the causes and cellular responses to aneuploidy is crucial for cancer research.
  • Targeting mechanisms that maintain chromosome stability may offer therapeutic strategies.