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Mutation in aging mice occurs in diverse cell types that proliferate postmutation.
Jared M Fischer1, James R Stringer
1Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, OH 45267, USA.
Aging Cell
|July 26, 2008
Summary
Aging leads to the accumulation of mutant cells in diverse tissues, including the heart, brain, and kidneys. This increase is driven by both new mutations and cell proliferation, even in non-replicating cells.
Area of Science:
- Genetics
- Cell Biology
- Aging Research
Background:
- Cellular mutations accumulate with age.
- Understanding mutation accumulation in different cell types is crucial for aging research.
Purpose of the Study:
- To investigate the relationship between aging, cell proliferation, and mutation rates in various cell types.
- To quantify the age-associated accumulation of mutant cells in the heart, brain, and kidneys.
Main Methods:
- Utilized G11 PLAP mice aged 1 week to 24 months.
- Detected mutant cells via Placental Alkaline Phosphatase (PLAP) activity staining.
- Examined tissue sections from hearts, brains, and kidneys.
Main Results:
- The number of PLAP-positive (mutant) cells increased with age across all examined tissues.
- Mutant cells were found in both proliferative (kidney) and non-proliferative (heart, brain) cell types.
- Mutant cells appeared as singletons and clusters, with frequencies increasing with age.
Conclusions:
- Age-associated mutant cell accumulation occurs in diverse cell types.
- Both new mutations and proliferation of pre-existing mutant cells contribute to this accumulation.
- This process happens even in cells with low replication rates.
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