Whole-Genome Profiling in Liposarcomas Reveals Genetic Alterations Common to Specific Telomere Maintenance Mechanisms
| Autor: | Dominique Broccoli, Jaclyn Schwalm, Margaret von Mehren, Samuel Litwin, Joseph R. Testa, Jay E. Johnson, Edward J. Gettings, Jianming Pei |
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| Rok vydání: | 2007 |
| Předmět: |
Male
Genome instability Cancer Research Loss of Heterozygosity Biology medicine.disease_cause Genome Genomic Instability Gene mapping Gene duplication medicine Humans Aged Genetics Genome Human Gene Expression Profiling Gene Amplification Liposarcoma Middle Aged Telomere Gene expression profiling Oncology Female Human genome Carcinogenesis |
| Zdroj: | Cancer Research. 67:9221-9228 |
| ISSN: | 1538-7445 0008-5472 |
| DOI: | 10.1158/0008-5472.can-07-1133 |
| Popis: | Telomere attrition ultimately leads to the activation of protective cellular responses, such as apoptosis or senescence. Impairment of such mechanisms can allow continued proliferation despite the presence of dysfunctional telomeres. Under such conditions, high levels of genome instability are often engendered. Data from both mouse and human model systems indicate that a period of genome instability might facilitate tumorigenesis. Here, we use a liposarcoma model system to assay telomere maintenance mechanism (TMM)–specific genetic alterations. A multiassay approach was used to assess the TMMs active in tumors. Genomic DNA from these samples was then analyzed by high-resolution DNA mapping array to identify genetic alterations. Our data reveal a higher level of genome instability in alternative lengthening of telomere (ALT)–positive tumors compared with telomerase-positive tumors, whereas tumors lacking both mechanisms have relatively low levels of genome instability. The bulk of the genetic changes are amplifications, regardless of the mode of telomere maintenance used. We also identified genetic changes specific to the ALT mechanism (e.g., deletion of chromosome 1q32.2-q44) as well as changes that are underrepresented among ALT-positive tumors, such as amplification of chromosome 12q14.3-q21.2. Taken together, these studies provide insight into the molecular pathways involved in the regulation of ALT and reveal several loci that might be exploited either as prognostic markers or targets of chemotherapeutic intervention. [Cancer Res 2007;67(19):9221–8] |
| Databáze: | OpenAIRE |
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