Developing genetically engineered mouse models to study tumor suppression.

Area of Science:

• * Genetics and Developmental Biology
• * Cancer Research and Molecular Oncology

Background:

• * The late 1980s marked a significant advancement in cancer research with the development of tools to create mouse models featuring tumor suppressor gene deletions.
• * Studying these deletions in whole animals highlighted the dual role of tumor suppressors in both cancer and normal development, as some deletions led to embryonic lethality.

Purpose of the Study:

• * To review the technical methodologies for generating genetically engineered mouse models with altered tumor suppressor genes.
• * To provide examples of how manipulating tumor suppressors in mice informs our understanding of cancer development and gene function.

Main Methods:

• * Generation of mice with specific tumor suppressor gene deletions.
• * Development of sophisticated models allowing cell-type-specific and temporal gene deletion.
• * Incorporation of point mutations mimicking those found in human cancers.

Main Results:

• * Tumor suppressor gene deletions can result in viable mice or embryonic lethality, underscoring their developmental importance.
• * Conditional and inducible mouse models enable precise investigation of gene roles in specific cell types and at specific times.
• * Modeling human cancer mutations in mice reveals their specific contributions to tumorigenesis.
• * Some tumor suppressor alterations only promote cancer when combined with other genetic changes, indicating a modifying role.

Conclusions:

• * Genetically engineered mouse models are powerful tools for dissecting the complex roles of tumor suppressors in cancer and development.
• * These models facilitate the study of gene function, the impact of specific mutations, and the interplay between different genetic factors in tumorigenesis.