Publication Date:
2005-07-16
Description:
Mutations in mitochondrial DNA (mtDNA) accumulate in tissues of mammalian species and have been hypothesized to contribute to aging. We show that mice expressing a proofreading-deficient version of the mitochondrial DNA polymerase g (POLG) accumulate mtDNA mutations and display features of accelerated aging. Accumulation of mtDNA mutations was not associated with increased markers of oxidative stress or a defect in cellular proliferation, but was correlated with the induction of apoptotic markers, particularly in tissues characterized by rapid cellular turnover. The levels of apoptotic markers were also found to increase during aging in normal mice. Thus, accumulation of mtDNA mutations that promote apoptosis may be a central mechanism driving mammalian aging.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kujoth, G C -- Hiona, A -- Pugh, T D -- Someya, S -- Panzer, K -- Wohlgemuth, S E -- Hofer, T -- Seo, A Y -- Sullivan, R -- Jobling, W A -- Morrow, J D -- Van Remmen, H -- Sedivy, J M -- Yamasoba, T -- Tanokura, M -- Weindruch, R -- Leeuwenburgh, C -- Prolla, T A -- AG021905/AG/NIA NIH HHS/ -- AG16694/AG/NIA NIH HHS/ -- AG17994/AG/NIA NIH HHS/ -- AG18922/AG/NIA NIH HHS/ -- AG21042/AG/NIA NIH HHS/ -- DK48831/DK/NIDDK NIH HHS/ -- RR00095/RR/NCRR NIH HHS/ -- T32 AG00213/AG/NIA NIH HHS/ -- T32 GM07601/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2005 Jul 15;309(5733):481-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Genetics and Medical Genetics, University of Wisconsin, Madison, WI 53706, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16020738" target="_blank"〉PubMed〈/a〉
Keywords:
Aging/*physiology
;
Amino Acid Substitution
;
Animals
;
*Apoptosis
;
Caspase 3
;
Caspases/metabolism
;
Cloning, Molecular
;
DNA Damage
;
DNA Fragmentation
;
DNA, Mitochondrial/*genetics
;
DNA-Directed DNA Polymerase/genetics
;
Gene Targeting
;
Humans
;
Hydrogen Peroxide/metabolism
;
Lipid Peroxidation
;
Liver/metabolism
;
Mice
;
Mitochondria, Heart/metabolism
;
Mitochondria, Liver/metabolism
;
Muscle, Skeletal/metabolism
;
*Mutation
;
Myocardium/metabolism
;
*Oxidative Stress
;
Phenotype
;
Presbycusis/etiology
;
Reactive Oxygen Species/metabolism
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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