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Genetic analyses of fancy rat-derived mutations
Takashi Kuramoto1, Mayuko Yokoe, Kayoko Yagasaki
1Institute of Laboratory Animals, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Experimental Animals
|May 21, 2010
Summary
Fancy rats introduced novel mutations, including coat color and texture changes, enhancing the laboratory rat model. These unique mutations, mapped to specific chromosomes, offer valuable resources for biomedical research.
Area of Science:
- Genetics
- Animal Models
- Biomedical Research
Background:
- Laboratory rats are crucial for biomedical research.
- Fancy rats possess unique genetic variations not found in standard laboratory strains.
- Collecting and characterizing these variations can expand the utility of rat models.
Purpose of the Study:
- To introduce fancy rat-derived mutations into a laboratory setting.
- To characterize and genetically map newly identified rat mutations.
- To enhance the value of the laboratory rat model system for research.
Main Methods:
- Six fancy rats from a US colony were used as founders.
- Initial crosses with laboratory strains (TM/Kyo, PVG/Seac) followed by inbreeding.
- Genetic analysis, including chromosome mapping and candidate gene analysis.
Main Results:
- Nine distinct mutations were isolated: 5 coat colors (am, Be, g, Pel, sia), 1 coat pattern (hs), 2 coat textures (Re, sat), and 1 ear malformation (dmbo).
- Seven mutations were mapped to specific rat chromosomes (Chr 1, 3, 7, 8, 14, 15).
- A missense mutation (Ser79Pro) in the tyrosinase gene was identified as the cause of the 'siamese' (sia) coat color mutation.
Conclusions:
- Fancy rat colonies are a valuable source for novel rat mutations.
- The identified fancy-derived mutations are likely unique and not previously described in laboratory rats.
- These new mutations increase the genetic diversity and research potential of laboratory rat models.
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