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ATM induction insufficiency in a radiosensitive breast-cancer patient
R A Clarke1, Z H Fang, P J Marr
1Molecular Genetics Laboratories, Cancer Care Center, Division of Cancer Services, The St George Hospital and University of New South Wales, Australia. r.clarke@unsw.edu.au
Abstract:
The ataxia telangiectasia (A-T) gene (ATM) is a dominant breast cancer gene with tumour suppressor activity. ATM also regulates cellular sensitivity to ionising radiation (IR) presumably through its role as a facilitator of DNA repair. In normal cells and tissues the ATM protein is rapidly induced by IR to threshold/maximum levels. The kinase function of the ATM protein is also rapidly activated in response to IR. The fact that women carriers of ATM mutations can have an increased risk of developing breast cancer and that many sporadic breast tumours have reduced levels of the ATM protein broadens the scope of ATM's tumour suppressor within the breast. This report describes the downregulation of ATM protein levels in a radiosensitive breast cancer patient. Postinduction ATM levels were up to tenfold lower in the patient's fresh tissues compared to normal controls. These results might indicate a much broader role for ATM anomalies in breast cancer aetiology.
Insights
Ataxia telangiectasia (ATM) gene mutations increase breast cancer risk. This study found significantly lower ATM protein levels in a radiosensitive breast cancer patient, suggesting broader ATM roles in cancer.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- The ATM gene is a known tumor suppressor and dominant breast cancer gene.
- ATM regulates cellular sensitivity to ionizing radiation (IR) via DNA repair.
- ATM protein levels and kinase activity increase rapidly upon IR exposure in normal cells.
Observation:
- This report details ATM protein downregulation in a radiosensitive breast cancer patient.
- Post-induction ATM levels were up to tenfold lower in the patient's fresh tissues compared to normal controls.
Findings:
- ATM protein levels were significantly reduced in the breast cancer patient's tissues.
- This downregulation was observed even after IR induction.
Implications:
- ATM anomalies may play a broader role in breast cancer etiology.
- Reduced ATM levels could contribute to radiosensitivity and cancer development.
- Further research into ATM's tumor suppressor function in breast cancer is warranted.
