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Live Cell Imaging of Chromosome Segregation During Mitosis
06:39

Live Cell Imaging of Chromosome Segregation During Mitosis

Published on: March 14, 2018

Non-random distribution of abnormal mitoses in heteroploid cell lines

W C Dooley1, D C Allison

  • 1Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.

Cytometry
|January 1, 1992
PubMed

Insights

Heteroploid cells exhibit frequent mitotic segregation errors (MSE), leading to unequal DNA distribution. These errors tend to correct by producing one daughter cell with DNA content closer to the norm.

Area of Science:

  • Cell Biology
  • Genetics
  • Cytometry

Background:

  • Cellular DNA content and chromosomal stability are crucial for normal cell division.
  • Heteroploid cell lines exhibit aneuploidy, complicating cell cycle regulation.

Purpose of the Study:

  • To investigate the frequency and nature of mitotic segregation errors (MSE) in heteroploid cell lines.
  • To compare MSE in heteroploid cells versus chromosomally stable cell lines.

Main Methods:

  • Absorption-cytometric DNA measurements were used to quantify DNA content in different cell cycle phases (G0/G1, G2, metaphase, telophase).
  • Analysis focused on telophase cell pairs in MCa-11, HL-60 (heteroploid), and WCHE-5 (stable) cell lines.

Main Results:

  • Morphologically unbalanced mitoses were significantly more frequent in heteroploid MCa-11 and HL-60 lines compared to the stable WCHE-5 line.
  • Unequal DNA segregation into daughter telophase nuclei characterized these unbalanced mitoses.
  • Mitotic segregation errors (MSE) predominantly occurred in telophase cells with non-modal DNA content.

Conclusions:

  • Heteroploid cells are prone to mitotic segregation errors (MSE) during telophase.
  • These errors involve unequal DNA segregation, particularly in cells with non-modal DNA content.
  • MSE in heteroploid cells can result in daughter cells with DNA content closer to the modal population, suggesting a compensatory mechanism.

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