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Genomic DNA with transformation-related activity and melanoma antigen expression
M Tagawa1, T Sakamoto, Y Tamura
1Department of Immunology, School of Medicine, Chiba University, Japan.
Abstract:
We have analyzed the mouse melanoma antigen with monoclonal antibodies established by syngeneic immunization. To further understand the structure of this antigen at a molecular level, we have cloned the genomic DNA controlling the expression of melanoma antigen by cosmid library transfection and a monoclonal antibody. In the process of analyzing this DNA fragment we found that it contained a gene related with transformation, which was proved by tumor formation in nude mice inoculated with NIH/3T3 transfectants of this DNA fragment. We discuss the structure of the gene product based on the deduced amino acid sequence of cDNA, which maps the genome bearing transformation-related activity.
Insights
Researchers identified a transformation-related gene within mouse melanoma antigen DNA. This gene induced tumor formation in nude mice, revealing its oncogenic potential and aiding in understanding melanoma antigen structure.
Area of Science:
- Immunology
- Molecular Biology
- Oncology
Background:
- Melanoma antigen characterization is crucial for understanding cancer progression.
- Monoclonal antibodies are key tools for identifying and isolating specific antigens.
- Understanding the molecular basis of melanoma antigen expression can reveal novel therapeutic targets.
Purpose of the Study:
- To clone and analyze the genomic DNA responsible for mouse melanoma antigen expression.
- To investigate the functional role of the cloned DNA fragment, particularly its transformation potential.
- To elucidate the molecular structure of the melanoma antigen gene product.
Main Methods:
- Syngeneic immunization in mice to generate monoclonal antibodies against melanoma antigen.
- Cosmid library transfection for cloning the genomic DNA controlling melanoma antigen expression.
- Tumorigenicity assays in nude mice using NIH/3T3 transfectants to assess transformation activity.
- Deduced amino acid sequencing from cDNA to analyze the structure of the gene product.
Main Results:
- Successfully cloned the genomic DNA fragment associated with mouse melanoma antigen expression.
- Identified a transformation-related gene within the cloned DNA fragment.
- Demonstrated the oncogenic potential of this gene through tumor formation in nude mice.
- Deduced the amino acid sequence of the gene product, providing insights into its structure.
Conclusions:
- The cloned DNA fragment contains a transformation-related gene with oncogenic properties.
- This gene plays a role in the molecular mechanisms of melanoma antigen expression and potentially tumor development.
- The study provides a molecular basis for understanding the structure and function of the mouse melanoma antigen.