Fidelity of DNA Polymerase-β in Neurons from Young and Very Aged Mice |
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| Authors: | Kalluri Subba Rao George M Martin Lawrence A Loeb |
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| Institution: | Joseph Gottstein Memorial Cancer Research Laboratory and Department of Pathology, University of Washington, School of Medicine, Seattle, Washington, U.S.A.;School of Life Sciences, University of Hyderabad, Hyderabad, India |
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| Abstract: | Abstract: Neurons do not divide during adult life and thus they provide a unique system to study the effects of age-accumulated damage to DNA in the absence of DNA replication. We have analyzed DNA polymerase activity in neurons isolated from young adult and very aged mice. The predominant catalytic activity is DNA polymerase-β and it is present in similar amounts in neurons from young and old mice. This polymerase is highly errorprone in copying φX174 DNA, the error frequency being about 1/7,000 and not significantly different when obtained from young and old animals. This high infidelity is considered with respect to DNA repair and the protein synthesis error catastrophe theory of aging. |
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| Keywords: | DNA polymerase Aging Fidelity Neurons |
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