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Updated: Aug 3, 2026

Focus Formation: A Cell-based Assay to Determine the Oncogenic Potential of a Gene
Published on: December 31, 2014
c-myc oncoprotein function
1Department of Medicine, Johns Hopkins Oncology Center, Johns Hopkins University School of Medicine, Baltimore, MD.
Abstract:
Genetic alterations of the c-myc locus in various malignancies and the ability of c-myc to transform cultured cells and induce tumors in transgenic animals attest to its central role in many neoplasms. By dissecting the c-Myc protein, a number of critical functional domains of c-Myc have been identified and characterized; these findings suggest a model for c-Myc function and intracellular activity (Fig. 4). c-Myc is synthesized in the cytoplasm and undergoes oligomerization another protein such as Max. Its nuclear localization signal allows c-Myc to be targeted to and retained in the nucleus, where the protein seeks out and binds to specific DNA sites, perhaps facilitated by c-Myc's ability to bind non-specifically to DNA. Once bound to specific DNA sequences, c-Myc then activates or inhibits transcription of a number of target genes, with consequent alterations in cell growth and differentiation. Continued studies of c-Myc and its partner Max should further elucidate the mechanisms by which c-Myc can contribute both to the regulation of normal cell growth and the alteration in that regulation in neoplasia.
Insights
The c-Myc protein plays a key role in cancer by regulating cell growth and differentiation. Understanding its function and interactions is crucial for developing new cancer therapies.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Genetic alterations in the c-myc locus are implicated in various malignancies.
- The c-Myc protein is known to transform cultured cells and induce tumors in transgenic animals, highlighting its oncogenic potential.
Purpose of the Study:
- To identify and characterize critical functional domains of the c-Myc protein.
- To propose a model for c-Myc function and intracellular activity.
Main Methods:
- Dissection and characterization of the c-Myc protein structure and domains.
- Analysis of c-Myc's intracellular localization, DNA binding, and transcriptional activity.
Main Results:
- Identification of critical functional domains within the c-Myc protein.
- Characterization of c-Myc's synthesis in the cytoplasm, oligomerization with proteins like Max, and nuclear localization.
- Demonstration of c-Myc binding to specific DNA sites to modulate target gene transcription.
Conclusions:
- The c-Myc protein's functional domains and intracellular activities are critical for its role in neoplasia.
- Further studies on c-Myc and its partner Max will elucidate its role in normal cell growth regulation and its alterations in cancer.
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