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Knockout mouse models and mammary tumorigenesis
1Genetics of Development and Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 10/9N105, Bethesda, MD 20892, USA. chuxiad@bdg10.niddk.nih.gov
Abstract:
The generation of transgenic mice overexpressing activated forms of oncogenes has greatly advanced our understanding into their roles in mammary tumor initiation, promotion and progression. However, targeted disruption of tumor suppressor genes often results in lethality at stages prior to mammary tumor formation. This obstacle can now be overcome using several approaches including conditional knockouts that delete genes of interest in a spatial and temporal manner. This review summarizes recent studies on tumor suppressor genes, including APC, ATM, BRCA1, BRCA2, PTEN and p53, in knockout mouse models and our understanding of the possible mechanisms underlying mammary tumorigenesis.
Insights
Transgenic mouse models help study mammary tumors. Conditional knockout mice overcome lethality, enabling research into tumor suppressor genes like APC, ATM, BRCA1, BRCA2, PTEN, and p53 in tumorigenesis.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Oncogene overexpression in transgenic mice advances understanding of mammary tumor development.
- Targeting tumor suppressor genes is crucial, but often hindered by embryonic lethality in knockout models.
Purpose of the Study:
- To review the role of key tumor suppressor genes in mammary tumorigenesis using knockout mouse models.
- To explore mechanisms of mammary tumor formation and progression influenced by these genes.
Main Methods:
- Summarizing recent studies utilizing conditional knockout mouse models.
- Analyzing data from models targeting specific tumor suppressor genes (APC, ATM, BRCA1, BRCA2, PTEN, p53).
Main Results:
- Conditional knockouts enable the study of tumor suppressor gene functions in mammary tumor formation.
- These models provide insights into the mechanisms of mammary tumorigenesis.
Conclusions:
- Conditional knockout technology is essential for studying tumor suppressor genes in mammary cancer.
- Understanding these genes' roles is vital for developing targeted cancer therapies.