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Related Experiment Videos

Bub1: escapades in a cellular world.

Grace L Williams1, Thomas M Roberts, Ole V Gjoerup

  • 1Department of Cancer Biology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, Massachusetts, USA.

Cell Cycle (Georgetown, Tex.)
|July 24, 2007
PubMed
Summary
This summary is machine-generated.

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The spindle assembly checkpoint ensures accurate chromosome segregation. Loss of Bub1 kinase, crucial for this checkpoint, can lead to cancer by causing instability and aneuploidy.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The spindle assembly checkpoint (SAC) is vital for high-fidelity mitotic chromosome segregation.
  • SAC function relies on monitoring microtubule attachment and tension at sister chromatids.
  • Key regulators like Bub1 kinase play critical roles in SAC and other cellular processes.

Purpose of the Study:

  • To investigate the pleiotropic roles of Bub1 kinase beyond its canonical SAC function.
  • To explore the link between Bub1 dysfunction, tumorigenesis, and the p53 pathway.
  • To understand the impact of SV40 large T antigen (LT) on Bub1 and oncogenic transformation.

Main Methods:

  • Analysis of Bub1 mutations in colorectal cancer.
  • Investigating the surveillance mechanism linking Bub1 loss to p53 pathway activation.

Related Experiment Videos

  • Studying the effects of SV40 large T antigen (LT) on Bub1 function and cellular transformation.

    • Main Results:

    • Bub1 is essential for inner centromere assembly, sister chromatid cohesion, and metaphase congression.
    • Bub1 mutations are implicated in driving tumorigenesis through chromosomal instability (CIN) and aneuploidy.
    • Loss of Bub1 activates the p53 pathway, leading to premature senescence in human fibroblasts.
    • SV40 large T antigen (LT) targets Bub1, correlating with oncogenic transformation and compromised spindle checkpoint.

    Conclusions:

    • Bub1 kinase has diverse roles essential for genome stability and cell cycle regulation.
    • Bub1 dysfunction contributes to cancer development by promoting aneuploidy and activating tumor suppressor pathways.
    • Targeting of Bub1 by oncogenic proteins like LT highlights its significance in cellular transformation and checkpoint control.