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Mutational fingerprints of aging
Martijn E T Dollé1, Wendy K Snyder, David B Dunson
1Sam and Ann Barshop Center for Longevity and Aging Studies, University of Texas Health Science Center, 15355 Lambda Drive, STCBM 2.200, San Antonio, TX 78245, USA. dolle@uthscsa.edu
Nucleic Acids Research
|January 15, 2002
Summary
Mutation spectra diverge in mouse organs with age, differing from young mice. Organ function, not just cell division, drives these age-related changes in mutation patterns.
Area of Science:
- Genetics
- Molecular Biology
- Gerontology
Background:
- Understanding age-related changes in DNA mutation patterns is crucial for comprehending aging and disease.
- Previous studies suggest mutation spectra can vary across tissues, but age-dependent organ specificity requires further investigation.
Purpose of the Study:
- To investigate age-related differences in spontaneous point mutation spectra across various mouse tissues.
- To determine the factors contributing to organ-specific mutation patterns during aging.
Main Methods:
- Utilized a lacZ plasmid transgenic mouse model to analyze spontaneous point mutations.
- Examined mutation spectra in brain, heart, liver, spleen, and small intestine of young and old mice.
Main Results:
- Mutation spectra were similar in young mice but diverged significantly in old age.
- Brain and heart showed predominant G:C-->A:T transitions at CpG sites, indicating low oxidative damage.
- A:T base pair changes correlated with tissue proliferative activity, with high percentages in spleen and lymphoma.
Conclusions:
- Age-related organ-specific differences in mutation spectra are influenced by factors beyond replicative history, likely involving organ function.
- The findings suggest a potential role for hypermutation processes in splenocytes in carcinogenesis.
- Developmental cell division may establish a common mutation mechanism in young tissues, which diverges with age.