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Oncogene amplification in solid tumors.

¹Deutsches Krebsforschungszentrum, Abteilung Zytogenetik-H0400, Im Neuenheimer Feld 280, Heidelberg, D-69120, Germany.

Seminars in Cancer Biology

|August 17, 1999

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DNA amplification, a selective increase in gene copy number, is crucial for meeting cellular demands for specific gene products. This process is linked to chromosomal abnormalities and oncogene activation in solid tumors, reflecting genetic instability.

Area of Science:

Genetics
Molecular Biology
Oncology

Background:

Gene amplification, or DNA amplification, involves a selective increase in gene copy number.
This process is distinct from elevated gene expression but often leads to increased product levels.
Cells utilize amplification to meet high demands for specific gene products beyond single-copy gene capacity.

Purpose of the Study:

To define and differentiate DNA amplification from gene expression.
To highlight the role of DNA amplification in cellular mechanisms for producing specific gene products.
To discuss the cytogenetic evidence and oncogenic significance of DNA amplification in solid tumors.

Main Methods:

Cytogenetic studies of human and animal tumor cells.
Identification of chromosomal abnormalities associated with amplified DNA, such as double minutes (DMs) and homogeneously staining regions (HSRs).

Related Experiment Videos

Detection of amplified oncogenes, starting with MYCN.

Main Results:

DNA amplification leads to increased gene copy numbers and often enhanced product levels.
Cytogenetic abnormalities like DMs and HSRs are diagnostic markers for amplified DNA in tumor cells.
The MYCN oncogene was the first identified oncogene amplification in solid tumors, with many others now recognized.

Conclusions:

Oncogene amplification is a significant factor in the development of numerous human solid tumors.
Amplification reflects the underlying genetic instability characteristic of solid tumor cells.
Understanding DNA amplification is key to comprehending tumor development and genetic instability.