The ATM-p53 pathway suppresses aneuploidy-induced tumorigenesis.

Abstract

The spindle assembly checkpoint (SAC) is essential for proper sister chromatid segregation. Defects in this checkpoint can lead to chromosome missegregation and aneuploidy. An increasing body of evidence suggests that aneuploidy can play a causal role in tumorigenesis. However, mutant mice that are prone to aneuploidy have only mild tumor phenotypes, suggesting that there are limiting factors in the aneuploidy-induced tumorigenesis. Here we provide evidence that p53 is such a limiting factor. We show that aneuploidy activates p53 and that loss of p53 drastically accelerates tumor development in two independent aneuploidy models. The p53 activation depends on the ataxia-telangiectasia mutated (ATM) gene product and increased levels of reactive oxygen species. Thus, the ATM-p53 pathway safeguards not only DNA damage but also aneuploidy.

• Authors: Min Li, Xiao Fang, Darren J Baker, Linjie Guo, Xue Gao, Zhubo Wei, Shuhua Han, Jan M van Deursen, Pumin Zhang
• Journal: Proceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 107 Issue 32 Pg. 14188-93 (Aug 10 2010) ISSN: 1091-6490 [Electronic] United States
• PMID: 20663956 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)

Chemical References

• Cell Cycle Proteins
• DNA-Binding Proteins
• Reactive Oxygen Species
• Tumor Suppressor Protein p53
• Tumor Suppressor Proteins
• Ataxia Telangiectasia Mutated Proteins
• Atm protein, mouse
• Protein Serine-Threonine Kinases

Topics

• Aneuploidy
• Animals
• Ataxia Telangiectasia Mutated Proteins
• Cell Cycle Proteins (metabolism)
• DNA Damage
• DNA-Binding Proteins (metabolism)
• Mice
• Mice, Transgenic
• Neoplasms (etiology)
• Protein Serine-Threonine Kinases (metabolism)
• Reactive Oxygen Species
• Tumor Suppressor Protein p53 (metabolism)
• Tumor Suppressor Proteins (metabolism)