All cancer therapies must be based on differences between tumor cells and the normal tissue from which they arise. One obvious, but largely unexploited, difference between tumor cells and normal cells is aneuploidy. Aneuploidy (abnormal chromosome number), including near polyploidy (increased genome sets), is a prominent feature of most cancers yet the consequences of this alteration of the genome is poorly understood. Aneuploidy can either be due to abnormal numbers of whole chromosomes, which originate from mitotic chromosome segregation errors, or to structural rearrangements of chromosomes, which originate from DNA breaks and recombination. This laboratory has focused on whole chromosome aneuploidy because it is one of the most mysterious aspects of tumor biology;there has been a one hundred year debate over whole chromosome aneuploidy: Is it beneficial, detrimental, or a completely neutral passenger phenomenon during tumor development? The uncertainty about the contribution of aneuploidy to tumorigenesis is largely fueled by the paucity of mechanisms explaining how aneuploidy impacts tumorigenesis or the properties of mature cancers. This grant will address two key questions about aneuploidy and cancer. In the first two aims, I will characterize potential mechanisms by which whole chromosome aneuploidy could initiate/promote cancer.
The first aim will address whether chromosome segregation errors can produce DNA damage. A series of imaging and biochemical experiments will test the hypothesis that micronuclei, generated by whole chromosome mis-segregation, have abnormal chromatin and/or nuclear architecture that leads to defective DNA replication and chromosome breaks.
The second aim will define the role of a specific recurrent aneuploidy - extra copies of chromosome 8 - in tumor development. Although polysomy occurs in many tumor types, the experiments will focus on the development of acute myelogenous leukemia because of methods to generate myeloid progenitor cells that do or do not contain polysomy 8. In the third Aim, we will determine if polysomy 8 causes vulnerabilities that can be exploited to discover new cancer drug targets.
This third aim follows directly from previous work under this grant that defined 'ploidy-specific lethality', where genes that are not essential in normal diploid cells become essential in polyploid cells or extra centrosome-containing cells that have a chromosomal instability phenotype.

Public Health Relevance

The goal of this project is to define how abnormal numbers of chromosomes or aneuploidy impact the development of cancer. One aim of the proposal directly seeks to identify novel cancer therapeutic targets based on the fact that most cancers are aneuploid. !

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM083299-17
Application #
8675261
Study Section
Special Emphasis Panel (ZRG1-CB-R (02))
Program Officer
Deatherage, James F
Project Start
1997-05-01
Project End
2016-05-31
Budget Start
2014-06-01
Budget End
2015-05-31
Support Year
17
Fiscal Year
2014
Total Cost
$357,417
Indirect Cost
$152,417
Name
Dana-Farber Cancer Institute
Department
Type
DUNS #
076580745
City
Boston
State
MA
Country
United States
Zip Code
02215
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Zhang, Cheng-Zhong; Spektor, Alexander; Cornils, Hauke et al. (2015) Chromothripsis from DNA damage in micronuclei. Nature 522:179-84
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Gordon, David J; Resio, Benjamin; Pellman, David (2012) Causes and consequences of aneuploidy in cancer. Nat Rev Genet 13:189-203

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