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• W1962404374 abstract "Summary Genomic instability within somatic stem cells may lead to the accumulation of mutations and contribute to cancer or other age‐related phenotypes. However, determining the frequency of mutations that differ among individual stem cells is difficult from whole tissue samples because each event is diluted in the total population of both stem cells and differentiated tissue. Here the ability to expand neural stem/progenitor cells clonally permitted measurement of genomic alterations derived from a single initial cell. C57Bl/6 × DBA/2 hybrid mice were used and PCR analysis with strain‐specific primers was performed to detect loss of heterozygosity on nine different chromosomes for each neurosphere. The frequency with which changes occurred in neurospheres derived from 2‐month‐ and 2‐year‐old mice was compared. In 15 neurospheres derived from young animals both parental chromosomes were present for all nine chromosome pairs. In contrast, 16/17 neurospheres from old animals demonstrated loss of heterozygosity (LOH) on one or more chromosomes and seven exhibited a complete deletion of at least one chromosomal region. For chromosomes 9 and 19 there is a significant bias in the allele that is lost where in each case the C57Bl/6 allele is retained in 6/6 neurospheres exhibiting LOH. These data suggest that aging leads to a substantial mutational load within the neural stem cell compartment which can be expected to affect the normal function of these cells. Furthermore, the retention of specific alleles for chromosomes 9 and 19 suggests that a subset of mutational events lead to an allele‐specific survival advantage within the neural stem cell compartment." @default.
• W1962404374 created "2016-06-24" @default.
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• W1962404374 date "2004-11-02" @default.
• W1962404374 modified "2023-10-14" @default.
• W1962404374 title "Accumulation of mutations and somatic selection in aging neural stem/progenitor cells" @default.
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• W1962404374 doi "https://doi.org/10.1111/j.1474-9728.2004.00128.x" @default.
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