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Transforming activity of human tumor DNAs
Abstract:
High molecular weight DNAs of 26 human tumors and tumor cell lines were assayed for the presence of transmissible activated transforming genes by transfection of NIH 3T3 mouse cells. DNAs of two bladder carcinoma cell lines induced transformation with high efficiencies (approximately 0.2 transformant per microgram of DNA), whereas DNAs of the other tumors studied lacked detectable transforming activity. These findings suggest that dominant mutations or gene rearrangements can result in the activation of cellular transforming genes in some human tumors.
Insights
Researchers investigated human tumor DNA for activated transforming genes. Two bladder cancer cell lines showed high transforming activity, suggesting mutations activate cancer genes.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Cancer research focuses on identifying genetic alterations driving tumor development.
- Activated oncogenes are crucial in tumorigenesis, but their presence in human tumors is not fully understood.
Purpose of the Study:
- To detect transmissible activated transforming genes in human tumor DNA.
- To investigate the role of genetic mutations or rearrangements in activating these genes.
Main Methods:
- High molecular weight DNA was extracted from 26 human tumors and cell lines.
- DNA was transfected into NIH 3T3 mouse cells to assay for transforming activity.
Main Results:
- DNA from two bladder carcinoma cell lines induced NIH 3T3 cell transformation with high efficiency.
- DNA from other tumor types showed no detectable transforming activity.
Conclusions:
- Specific human tumors, like bladder carcinomas, harbor activated transforming genes.
- Dominant mutations or gene rearrangements are likely mechanisms for activating these cancer-related genes.