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Transgenic mouse models for studying mutations in vivo: applications in aging research
J Vijg1, M E Dollé, H J Martus
1Division on Aging, Harvard Medical School, Boston, MA, USA. jvijg@bidmc.harvard.edu
Mechanisms of Ageing and Development
|November 14, 1997
Summary
Somatic cell mutation accumulation increases with age in mouse liver but not brain. This study used a transgenic mouse model to track DNA mutations in vivo, revealing age-related changes in specific tissues.
Area of Science:
- Genetics
- Molecular Biology
- Aging Research
Background:
- Somatic cells accumulate DNA mutations over time.
- Understanding mutation accumulation is crucial for aging research.
- Transgenic models offer insights into in vivo genetic processes.
Purpose of the Study:
- To investigate age-related mutation accumulation in somatic cells and tissues.
- To develop and utilize a transgenic mouse model for studying DNA mutations.
- To compare mutation patterns in different organs during aging.
Main Methods:
- Construction of a transgenic mouse model with lacZ reporter plasmids.
- Efficient recovery of plasmids from mouse tissues into E. coli.
- Positive selection system for accurate mutation frequency determination.
- Life span study analyzing mutation accumulation in liver and brain tissues.
Main Results:
- Age-related mutation accumulation was observed in the liver of plasmid mice.
- No significant age-related mutation accumulation was detected in the brain.
- The liver exhibited a higher proportion of large size-change mutations compared to the brain.
Conclusions:
- Liver somatic cells show age-dependent mutation accumulation.
- Brain somatic cells appear resistant to age-related mutation accumulation.
- Tissue-specific differences exist in mutation accumulation and spectra during aging.