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Genomic instability: The cause and effect of BCR/ABL tyrosine kinase

Tomasz Skorski1

  • 1Department of Microbiology and Immunology, School of Medicine, Temple University, MRB 548A, 3400 N. Broad Street, Philadelphia, PA 19140, USA. tskorski@temple.edu

Current Hematologic Malignancy Reports
|April 29, 2010
PubMed

Insights

The BCR/ABL fusion kinase drives cancer by disrupting cell growth and DNA repair, leading to resistance against treatments like imatinib mesylate in chronic myelogenous leukemia.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The BCR/ABL fusion gene arises from DNA double-strand breaks, creating a constitutively active tyrosine kinase.
  • This BCR/ABL kinase drives malignant transformation by deregulating cellular processes like proliferation, apoptosis, differentiation, and adhesion.

Purpose of the Study:

  • To elucidate the mechanisms by which BCR/ABL kinase contributes to cancer development and treatment resistance.
  • To understand the role of BCR/ABL in DNA damage, repair, and cellular checkpoint control.

Main Methods:

  • Analysis of gene expression and protein activity related to BCR/ABL.
  • Investigation of DNA damage and repair pathways in BCR/ABL-positive cells.
  • Assessment of cellular responses to targeted therapies.

Main Results:

  • BCR/ABL kinase promotes deregulated cell growth, inhibits apoptosis, and enhances cell adhesion.
  • It facilitates DNA repair, prolongs cell cycle checkpoints, and increases resistance to apoptosis via Bcl-X(L) upregulation.
  • BCR/ABL activity compromises DNA repair fidelity, leading to genetic instability and resistance to imatinib mesylate.

Conclusions:

  • BCR/ABL kinase is a key driver of chronic myelogenous leukemia (CML) pathogenesis.
  • Its ability to promote DNA damage, impair repair, and confer treatment resistance highlights its critical role in malignant progression.
  • CML cells exhibit a mutator phenotype due to BCR/ABL activity, contributing to disease advancement.

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