Generation of trisomies in cancer cells by multipolar mitosis and incomplete cytokinesis.
Author
Summary, in English
One extra chromosome copy (i.e., trisomy) is the most common type of chromosome aberration in cancer cells. The mechanisms behind the generation of trisomies in tumor cells are largely unknown, although it has been suggested that dysfunction of the spindle assembly checkpoint (SAC) leads to an accumulation of trisomies through failure to correctly segregate sister chromatids in successive cell divisions. By using Wilms tumor as a model for cancers with trisomies, we now show that trisomic cells can form even in the presence of a functional SAC through tripolar cell divisions in which sister chromatid separation proceeds in a regular fashion, but cytokinesis failure nevertheless leads to an asymmetrical segregation of chromosomes into two daughter cells. A model for the generation of trisomies by such asymmetrical cell division accurately predicted several features of clones having extra chromosomes in vivo, including the ratio between trisomies and tetrasomies and the observation that different trisomies found in the same tumor occupy identical proportions of cells and colocalize in tumor tissue. Our findings provide an experimentally validated model explaining how multiple trisomies can occur in tumor cells that still maintain accurate sister chromatid separation at metaphase-anaphase transition and thereby physiologically satisfy the SAC.
Department/s
- Division of Clinical Genetics
- Department of Translational Medicine
- Section IV
- Paediatrics (Lund)
- Pathways of cancer cell evolution
- BioCARE: Biomarkers in Cancer Medicine improving Health Care, Education and Innovation
Publishing year
2010
Language
English
Pages
20489-20493
Publication/Series
Proceedings of the National Academy of Sciences
Volume
107
Issue
47
Full text
Links
Document type
Journal article
Publisher
National Academy of Sciences
Topic
- Pediatrics
- Medical Genetics
- Neurology
- Cancer and Oncology
Status
Published
Research group
- Pathways of cancer cell evolution
ISBN/ISSN/Other
- ISSN: 1091-6490