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Hematopoietic malignancies demonstrate loss-of-function mutations of BAX
J P Meijerink1, E J Mensink, K Wang
1Department of Hematology, University Hospital "St. Radboud" Nijmegen, Nijmegen, The Netherlands.
Blood
|May 16, 1998
Summary
Mutations in the pro-apoptotic BAX gene are found in human malignancies, including acute lymphoblastic leukemia. These BAX mutations lead to apoptosis resistance, suggesting BAX acts as a tumor suppressor.
Area of Science:
- Molecular biology
- Cancer research
- Genetics
Background:
- The BCL-2 gene family regulates apoptosis, crucial for development and tissue homeostasis.
- Anti-apoptotic BCL-2 family members can promote malignancy and chemotherapy resistance.
- The pro-apoptotic BAX molecule has emerged as a potential tumor suppressor.
Purpose of the Study:
- To investigate the role of BAX mutations in human hematopoietic malignancies.
- To determine the frequency and types of BAX mutations in cancer cells.
Main Methods:
- Analysis of human hematopoietic malignancy cell lines.
- Mutation screening of the BAX gene.
- Protein analysis to assess BAX expression and function.
Main Results:
- Approximately 21% of examined hematopoietic malignancies harbored BAX mutations.
- Common mutations included insertions/deletions in a G8 tract, causing frame shifts and loss of BAX protein.
- Other mutations involved amino acid substitutions in critical domains (BH1, BH3), impairing dimerization and apoptotic activity.
Conclusions:
- Mutations in the pro-apoptotic BAX gene occur in human malignancies.
- These BAX mutations result in loss of function and confer resistance to apoptosis.
- Evidence supports BAX's role as a tumor suppressor in hematopoietic cancers.