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Chromosomes and Cancer: Activation of Oncogenes

  • Orlando J. Miller
  • Eeva Therman
Chapter

Abstract

A large number of hematological (blood cell) and solid tumors of various types show consistent chromosome abnormalities, and there is overwhelming evidence that the chromosome changes are essential for the malignant phenotype. Almost every chromosome band is involved, indicating the large number of genes that can play a role in oncogenesis (Mitelman et al., 1997). Many of these rearrangements lead to cancer by activating a cellular oncogene (protooncogene). Protooncogenes are normal genes present in all metazoan cells. Genes homologous to protooncogenes are found in the retroviruses known to cause cancer in various animal species. They transform cells, either by being inserted into the host genome or by being present in multiple copies in the host cell (Bishop, 1983). The retroviruses originally acquired these oncogenes from the metazoan cells they infected. The oncogene of the Rous sarcoma virus is called v-src, and its homologue in the normal human genome is c-SRC, or SRC. More than 80 human protooncogenes have been localized to a specific chromosome or chromosome band. A normal cell can be transformed by activating one or more oncogenes in it. This most often occurs through chromosomal mechanisms such as translocation or amplification. In leukemias and lymphomas, these are mostly balanced reciprocal translocations; in solid tumors, deletions and trisomies are also common (Cobaleda et al., 1998; Helm and Mitelman, 1995).

Keywords

Acute Myelogenous Leukemia Burkitt Lymphoma Reciprocal Translocation Rous Sarcoma Virus Breakpoint Cluster Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2001

Authors and Affiliations

  • Orlando J. Miller
    • 1
  • Eeva Therman
    • 2
  1. 1.Center for Molecular Medicine and GeneticsWayne State University School of MedicineDetroitUSA
  2. 2.Laboratory of GeneticsUniversity of WisconsinMadisonUSA

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