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Modeling INK4/ARF tumor suppression in the mouse
Justin H Berger1, Nabeel Bardeesy
1Massachusetts General Hospital Cancer Center, Department of Medicine, Harvard Medical School, Boston, MA 02114, USA.
Abstract:
The INK4/ARF locus encodes the p15(INK4B), p16(INK4A) and p14(ARF) tumor suppressor proteins whose loss of function is associated with the pathogenesis of many human cancers. Dissecting the relative contribution of these genes to growth control in vivo is complicated by their physical contiguity and the frequency of homozygous deletions that inactivate all three components of this locus. While genetically engineered mouse models provide a rigorous system for elucidating cancer gene function, there is some evidence to suggest there are cross-species differences in regulating tumor biology. Given the prevalence of mouse models in cancer research and the potential contribution of such models to preclinical studies, it is important determine to what degree the function of these critical tumor suppressors is conserved between organisms. In this review, we assess the relative biological roles of INK4A, INK4B and ARF in mice and humans with the aim of determining the faithfulness of mouse models and also of obtaining insights into the pattern of specific tumor types that are associated with germline and somatic mutations at components of this locus. We will discuss 1) the contribution of INK4A, INK4B and ARF to growth control in vitro in a series of cell types, 2) the in vivo phenotypes associated with germline loss of function of this locus and 3) the study of Ink4a and Arf in different cancer-specific mouse models.
Insights
The INK4/ARF locus
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The INK4/ARF locus, encoding p15(INK4B), p16(INK4A), and p14(ARF) tumor suppressors, is crucial in preventing human cancers.
- Loss of function mutations in these genes contribute to cancer development.
- Studying their roles is complex due to gene proximity and frequent deletions.
Purpose of the Study:
- To review and assess the conserved biological roles of INK4A, INK4B, and ARF in mice and humans.
- To evaluate the accuracy of mouse models in cancer research.
- To gain insights into tumor types associated with mutations in this locus.
Main Methods:
- Review of existing literature on INK4A, INK4B, and ARF.
- Analysis of in vitro growth control data across cell types.
- Examination of in vivo phenotypes from germline loss-of-function studies.
- Assessment of Ink4a and Arf roles in cancer-specific mouse models.
Main Results:
- The review synthesizes data on the contribution of INK4A, INK4B, and ARF to cellular growth control.
- It examines phenotypes associated with germline loss of the locus in vivo.
- It analyzes the function of Ink4a and Arf in various cancer models.
Conclusions:
- Understanding conserved functions of INK4A, INK4B, and ARF is vital for validating mouse models in cancer research.
- This review provides insights into species-specific differences and similarities in tumor suppressor gene function.
- The findings aid in understanding the link between mutations in this locus and specific cancer types.
