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Validation studies with Muta Mouse: a transgenic mouse model for detecting mutations in vivo.
1Molecular and Cellular Toxicology, Hazleton Washington, Inc., Kensington, Maryland 20895.
Environmental and Molecular Mutagenesis
|January 1, 1991
Summary
The MutaMouse model effectively detects in vivo mutations using a bacterial lacZ gene. This transgenic mouse system identified mutagenic effects from eight different chemicals across various tissues and dosing methods.
Area of Science:
- Genetics
- Toxicology
- Biotechnology
Background:
- Transgenic mouse models are crucial for studying mutagenesis in vivo.
- The MutaMouse utilizes a bacterial lacZ gene for mutation detection.
- Assessing in vivo mutagenicity requires reliable and sensitive detection systems.
Purpose of the Study:
- To evaluate the MutaMouse as a tool for detecting in vivo mutations.
- To assess the mutagenic potential of known chemical agents in a living organism.
- To determine the influence of various factors on mutation detection.
Main Methods:
- MutaMouse model with bacterial lacZ gene integrated into the genome.
- Administration of known mutagens/carcinogens via intraperitoneal injection and skin painting.
- Analysis of mutant frequency in bone marrow, liver, and testes tissues.
Main Results:
- All eight tested chemicals (N-ethyl-N-nitrosourea, chlorambucil, procarbazine, cyclophosphamide, acrylamide, dimethylbenzanthracene, N-methyl-N'-nitro-N-nitrosoguanidine, and acetic acid) induced increased mutant frequencies.
- Mutagenic effects varied based on chemical, dose, administration method, tissue, and time.
- Data on mutant frequency variability was analyzed in relation to lacZ gene populations and animal groups.
Conclusions:
- The MutaMouse is a valuable tool for in vivo mutagenicity testing.
- The model demonstrates sensitivity to a range of chemical mutagens.
- Further application of the MutaMouse for detecting heritable mutations is discussed.