DNA damage theory of aging
The DNA damage theory of aging proposes that aging is a consequence of unrepaired DNA damage accumulation. Damage in this context includes chemical reactions that mutate DNA and/or interfere with DNA replication. Although both mitochondrial and nuclear DNA damage can contribute to aging, nuclear DNA is the main subject of this analysis. Nuclear DNA damage can contribute to aging either indirectly (by increasing apoptosis or cellular senescence) or directly (by increasing cell dysfunction).
In humans, DNA damage occurs frequently and DNA repair processes have evolved to compensate. On average, approximately 800 DNA lesions occur per hour in each cell, or about 19,200 per cell per day (Vilenchik & Knudson 2000). In any cell some DNA damage may remain despite the action of repair processes. The accumulation of unrepaired DNA damage is more prevalent in certain types of cells, particularly in non-replicating or slowly replicating cells, which cannot rely on DNA repair mechanisms associated with DNA replication such as those in the brain, skeletal and cardiac muscle.
DNA damage and mutation
To understand the DNA damage theory of aging it is important to distinguish between DNA damage and mutation, the two major types of errors that occur in DNA. DNA damages and mutation are fundamentally different. Damages are physical abnormalities in the DNA, such as single and double strand breaks, 8-hydroxydeoxyguanosine residues and polycyclic aromatic hydrocarbon adducts. DNA damages can be recognized by enzymes, and thus they can be correctly repaired if redundant information, such as the undamaged sequence in the complementary DNA strand or in a homologous chromosome, is available for copying. If a cell retains DNA damage, transcription of a gene can be prevented and thus translation into a protein will also be blocked. Replication may also be blocked and/or the cell may die. Descriptions of decrements in function, characteristic of aging, associated with accumulation of DNA damages, are given later in this article.
In contrast to DNA damage, a mutation is a change in the base sequence of the DNA. A mutation cannot be recognized by enzymes once the base change is present in both DNA strands, and thus a mutation cannot be repaired. At the cellular level, mutations can cause alterations in protein function and regulation. Mutations are replicated when the cell replicates. In a population of cells, mutant cells will increase or decrease in frequency according to the effects of the mutation on the ability of the cell to survive and reproduce. Although distinctly different from each other, DNA damages and mutations are related because DNA damages often cause errors of DNA synthesis during replication or repair and these errors are a major source of mutation.
Given these properties of DNA damage and mutation, it can be seen that DNA damages are a special problem in non-dividing or slowly dividing cells, where unrepaired damages will tend to accumulate over time. On the other hand, in rapidly dividing cells, unrepaired DNA damages that do not kill the cell by blocking replication will tend to cause replication errors and thus mutation. The great majority of mutations that are not neutral in their effect are deleterious to a cell’s survival. Thus, in a population of cells comprising a tissue with replicating cells, mutant cells will tend to be lost. However infrequent mutations that provide a survival advantage will tend to clonally expand at the expense of neighboring cells in the tissue. This advantage to the cell is disadvantageous to the whole organism, because such mutant cells can give rise to cancer. Thus DNA damages in frequently dividing cells, because they give rise to mutations, are a prominent cause of cancer. In contrast, DNA damages in infrequently dividing cells are likely a prominent cause of aging.
The first person to suggest that DNA damage, as distinct from mutation, is the primary cause of aging was Alexander (1967). By the early 1980s there was significant experimental support for this idea in the literature (Gensler & Bernstein, 1981). By the early 1990s experimental support for this idea was substantial, and furthermore it had become increasingly evident that oxidative DNA damage, in particular, is a major cause of aging (Bernstein & Bernstein, 1991; Ames & Gold, 1991; Holmes et al., 1992; Rao & Loeb, 1992; Ames et al., 1993).
In a series of articles from 1970 to 1977, PV Narasimh Acharya, Phd. (1924–1993) theorized and scientifically proved that cells undergo "irreparable DNA damage," whereby DNA crosslinks occur when both normal cellular repair processes fail and cellular apoptosis does not occur. Specifically, PVN Acharya noted that double-strand breaks and a "cross-linkage joining both strands at the same point is irreparable because neither strand can then serve as a template for repair. The cell will die in the next mitosis or in some rare instances, mutate." (PVN Acharya; PVN Acharya & Bjorksten et al.) Acharya's research also showed how irreparable DNA damage is caused by environmental pollutants, low dose ionizing radiation and food additives, particularly nitrites and nitrates and such damage to the DNA is a causal factor for pre-mature aging and cancer.
Age-associated accumulation of DNA damage and decline in gene expression
In tissues composed of non- or infrequently replicating cells, DNA damages can accumulate with age and lead either to loss of cells, or, in surviving cells, loss of gene expression. Accumulated DNA damages are usually measured directly. Numerous studies of this type have indicated that oxidative damage to DNA is particularly important. The loss of expression of specific genes can be detected at both the mRNA level and protein level.
The adult brain is composed in large part of terminally differentiated non-dividing neurons. Many of the conspicuous features of aging reflect a decline in neuronal function. Accumulation of DNA damage with age in the mammalian brain has been reported during the period 1971 to the present in at least 29 studies, too many to describe here. A review of the role of DNA damage in aging, including a comprehensive summary of the studies showing DNA damage accumulation with age in brain, muscle, liver and kidney, is in press (Bernstein et al., 2008). Here, we mention only some recent studies involving rodents plus one human study. Rutten et al. (2007) showed that single-strand breaks accumulate in the mouse brain with age. Sen et al. (2007) showed that DNA damages which block the polymerase chain reaction in rat brain accumulate with age. Wolf et al. (2005) showed that the oxidative DNA damage 8-hydroxydeoxyguanosine (8-OHdG) accumulates in rat brain with age. As humans age from 48–97 years, 8-OHdG accumulates in the brain (Mecocci et al., 1993).
Decrements in function were noted in aging human brain, where transcription of a set of evaluated genes declines with age from 40 to 106 years (Lu et al., 2004). These genes play central roles in synaptic plasticity, vesicular transport and mitochondrial function. In the brain, promoters of genes with reduced expression have markedly increased DNA damage (Lu et al., 2004). In cultured human neurons, these gene promoters are selectively damaged by oxidative stress. Thus Lu et al. (2004) concluded that DNA damage may reduce the expression of selectively vulnerable genes involved in learning, memory and neuronal survival, initiating a program of brain aging that starts early in adult life.
Muscle strength, and stamina for sustained physical effort, have decrements in function with age in humans and other species. Skeletal muscle is a tissue composed largely of multinucleated myofibers, elements that arise from the fusion of mononucleated myoblasts. Accumulation of DNA damage with age in mammalian muscle has been reported in at least 18 studies (Bernstein et al., in press 2008) since 1971. We will mention here only two of the more recent studies in rodents plus one in humans. Hamilton et al. (2001) reported that the oxidative DNA damage 8-OHdG accumulates in heart and skeletal muscle (as well as in brain, kidney and liver) of both mouse and rat with age. In humans, increases in 8-OHdG with age were reported for skeletal muscle (Mecocci et al., 1999). Catalase is an enzyme that removes hydrogen peroxide, a reactive oxygen species, and thus limits oxidative DNA damage. In mice, when catalase expression is increased specifically in mitochondria, oxidative DNA damage (8-OHdG) in skeletal muscle is decreased and lifespan is increased by about 20% (Schriner et al., 2005; Linford et al., 2006). These findings suggest that mitochondria are a significant source of the oxidative damages contributing to aging.
Protein synthesis and protein degradation decline with age in skeletal and heart muscle, as would be expected, since DNA damages block gene transcription. In a recent study (Piec et al., 2005) found numerous changes in protein expression in rat skeletal muscle with age, including lower levels of several proteins related to myosin and actin. Force is generated in striated muscle by the interactions between myosin thick filaments and actin thin filaments.
Liver hepatocytes do not ordinarily divide and appear to be terminally differentiated, but they retain the ability to proliferate when injured. With age, the mass of the liver decreases, blood flow is reduced, metabolism is impaired, and alterations in microcirculation occur. At least 21 studies (Bernstein et al., in press 2008) have reported an increase in DNA damage with age in liver. For instance, Helbock et al. (1998) estimated that the steady state level of oxidative DNA base alterations increased from 24,000 per cell in the liver of young rats to 66,000 per cell in the liver of old rats.
In kidney, changes with age include reduction in both renal blood flow and glomerular filtration rate, and impairment in the ability to concentrate urine and to conserve sodium and water. DNA damages, particularly oxidative DNA damages, increase with age (at least 8 studies)(Bernstein et al., in press 2008). For instance Hashimoto et al. (2007) showed that 8-OHdG accumulates in rat kidney DNA with age.
Long-lived stem cells
Tissue-specific stem cells produce differentiated cells through a series of increasingly more committed progenitor intermediates. In hematopoiesis (blood cell formation), the process begins with long-term hematopoietic stem cells that self-renew and also produce progeny cells that upon further replication go through a series of stages leading to differentiated cells without self-renewal capacity. In mice, deficiencies in DNA repair appear to limit the capacity of hematopoietic stem cells to proliferate and self-renew with age (Rossi et al., 2007). Sharpless and Depinho (2007) reviewed evidence that hematopoietic stem cells, as well as stem cells in other tissues, undergo intrinsic aging. They speculated that stem cells grow old, in part, as a result of DNA damage. DNA damage may trigger signalling pathways, such as apoptosis, that contribute to depletion of stem cell stocks. This has been observed in several cases of accelerated aging and may occur in normal aging too (Freitas and de Magalhaes, 2011).
Mutation theories of aging
A popular idea, that has failed to gain significant experimental support, is the idea that mutation, as distinct from DNA damage, is the primary cause of aging. As discussed above, mutations tend to arise in frequently replicating cells as a result of errors of DNA synthesis when template DNA is damaged, and can give rise to cancer. However, in the mouse there is no increase in mutation in the brain with aging (Dolle et al., 1997; Stuart et al., 2000; Hille et al., 2005). Mice defective in a gene (Pms2) that ordinarily corrects base mispairs in DNA have about a 100-fold elevated mutation frequency in all tissues, but do not appear to age more rapidly (Narayanan et al., 1997). On the other hand, mice defective in one particular DNA repair pathway show clear premature aging, but do not have elevated mutation (Dolle et al., 2006).
One variation of the idea that mutation is the basis of aging, that has received much attention, is that mutations specifically in mitochondrial DNA are the cause of aging. Several studies have shown that mutations accumulate in mitochondrial DNA in infrequently replicating cells with age. DNA polymerase gamma is the enzyme that replicates mitochondrial DNA. A mouse mutant with a defect in this DNA polymerase is only able to replicate its mitochondrial DNA inaccurately, so that the mutation rate is 500-fold higher than in normal mice. Yet these mice showed no obvious features of rapidly accelerated aging (Vermulst et al., 2007). The probable explanation for the apparent lack of effect of the additional mutations in mitochondrial DNA is that, within a typical cell, there are large numbers of mitochondria and each mitochondrion can have multiple copies of mitochondrial DNA. Since most mutations are recessive, any particular deleterious mutation would not be expected to have a pronounced effect when many copies of the correct DNA sequence are present in the same and in other mitochondria in the cell. Overall, the observations discussed in this section indicate that mutations are not the primary cause of aging.
In rodents, caloric restriction slows aging and extends lifespan. At least 4 studies have shown that caloric restriction reduces 8-OHdG damages in various organs of rodents. One of these studies (Hamilton et al., 2001) showed that caloric restriction reduced accumulation of 8-OHdG with age in rat brain, heart and skeletal muscle, and in mouse brain, heart, kidney and liver. More recently, Wolf et al. (2005) showed that dietary restriction reduced accumulation of 8-OHdG with age in rat brain, heart, skeletal muscle, and liver. Thus reduction of oxidative DNA damage is associated with a slower rate of aging and increased lifespan.
Inherited defects that cause premature aging
If DNA damage is the underlying cause of aging, it would be expected that humans with inherited defects in the ability to repair DNA damages should age at a faster pace than persons without such a defect. Numerous examples of rare inherited conditions with DNA repair defects are known. Several of these show multiple striking features of premature aging, and others have fewer such features. Perhaps the most striking premature aging conditions are Werner syndrome (mean lifespan 47 years), Huchinson-Gilford Progeria (mean lifespan 13 years), and Cockayne syndrome (mean lifespan 13 years). Werner syndrome is due to an inherited defect in an enzyme (a helicase and exonuclease) that acts in base excision repair of DNA (e.g. Harrigan et al., 2006). Hutchinson-Guilford Progeria is due to a defect in Lamin A protein which forms a scaffolding within the cell nucleus to organize chromatin and is needed for repair of double-strand breaks in DNA (Liu et al., 2007). Cockayne Syndrome is due to a defect in a protein necessary for the repair process, transcription coupled nucleotide excision repair, which can remove damages, particularly oxidative DNA damages, that block transcription (D’Errico et al., 2007). In addition to these three conditions, several other human syndromes, that also have defective DNA repair, show several features of premature aging. These include ataxia telangiectasia, Nijmegen breakage syndrome, some subgroups of xeroderma pigmentosum, trichothiodystrophy, Fanconi anemia, Bloom syndrome and Rothmund-Thomson syndrome.
In addition to human inherited syndromes, experimental mouse models with genetic defects in DNA repair show features of premature aging and reduced lifespan (e.g. Vogel et al., 1999; Niedernhoffer et al., 2006; Mostoslavsky et al., 2006).
Lifespan in different mammalian species
Studies comparing DNA repair capacity in different mammalian species have shown that repair capacity correlates with lifespan. The initial study of this type, by Hart and Setlow (1974), showed that the ability of skin fibroblasts of seven mammalian species to perform DNA repair after exposure to a DNA damaging agent correlated with lifespan of the species. The species studied were shrew, mouse, rat, hamster, cow, elephant and human. This initial study stimulated many additional studies involving a wide variety of mammalian species, and the correlation between repair capacity and lifespan generally held up. In one of the more recent studies, Burkle et al. (2005) studied the level of a particular enzyme, poly(ADP-ribose) polymerase, which is involved in repair of single-strand breaks in DNA. They found that the lifespan of 13 mammalian species correlated with the activity of this enzyme. In addition, they found that humans who lived past 100 years had a significantly higher activity of this enzyme than younger individuals.
Numerous studies have shown that DNA damage accumulates in brain, muscle, liver, kidney, and in long-lived stem cell. These accumulated DNA damages are the likely cause of the decline in gene expression and loss of functional capacity observed with increasing age. On the other hand, accumulation of mutations, as distinct from DNA damages, is not a plausible candidate as the primary cause of aging. A calorie-restricted diet in mammals improves lifespan, and this improvement is associated with a decrease in oxidative DNA damage. Several inherited genetic defects in ability to repair DNA damage give rise to premature aging suggesting a causal relationship between DNA damage and aging. In comparisons of different mammalian species that differ in lifespan, DNA repair capacity is found to correlate with lifespan. The principal source of the DNA damages leading to normal aging appears to be reactive oxygen species, produced as byproducts of normal cellular metabolism.
- ^ Best,BP (2009). "Nuclear DNA damage as a direct cause of aging" (PDF). Rejuvenation Research 12 (3): 199–208. doi:10.1089/rej.2009.0847. PMID 19594328. http://www.benbest.com/lifeext/Nuclear_DNA_in_Aging.pdf.
- Acharya, PV. The isolation and partial characterization of age-correlated oligo-deoxyribo-ribonucleotides with covalently linked aspartyl-glutamyl polypeptides. Johns Hopkins Med J Suppl, June 1971, 1: 254-260. PMID 5055816.
- Acharya, PVN. Isolation and Partial Characterization of Age-Correlated Oligo-nucleotides with Covalently Bound Peptides. 14th Nordic Congress, Umea, Sweden, June 19, 1971.
- Acharya, PV; Ashman, SM; Bjorksten, J; The isolation and partial characterization of age-correlated oligo-deoxyribo-ribo nucleo peptides. Finska Kemists Medd. 81 No. 3 (1972) Suomen Kemists. Tied. Chemical Abstacts, Vol 78, No. 19. May 14, 1973. Abs. N. 122001 g.
- Acharya, PVN. DNA-damage: The Cause of Aging. Ninth International Congress of Biochemistry: Stockholm. July 1–7, 1973 (Abs.3 m 12).
- Acharya, PVN. Irreparable DNA-damage by Industrial Pollutants in Pre-mature Aging, Chemical Carcinogenesis and Cardiac Hypertrophy: Experiments and Theory. Israel Journal of Medical Sciences. Vol 13 (1977) p. 441.
- Alexander, P. The role of DNA lesions in processes leading to aging in mice. Symp. Soc. Exp Biol, 1967, 21, 29-50.
- Ames BN; Gold LS. Endogenous mutagens and the causes of aging and cancer. Mutat Res, 1991, 250, 3-16.
- Ames, BN; Shigenaga, MK; Hagen, TM. Oxidants, antioxidants, and the degenerative diseases of aging. Proc Natl Acad Sci USA, 1993, 90, 7915-7922.
- Bernstein, C; Bernstein, H. Aging, Sex, and DNA Repair, San Diego: CA, Academic Press; 1991.
- Bernstein, H; Payne, CM; Bernstein, C; Garewal, H; Dvorak, K. Cancer and aging as consequences of un-repaired DNA damage. In: New Research on DNA Damage (Editor: Frank Columbus) Nova Sci Publ, Hauppauge, NY (DATE REQUIRED))
- Bjorksten, J; Acharya, PV; Ashman S; Wetlaufer, DB. Gerogenic Fractions in the Tritiated Rat. Journal of the American Geriatrics Society, July 1971, 7: 561-574. PMID 5106728.
- Burkle, A; Brabeck, C; Diefenbach, J; Beneke, S. The emerging role of poly(ADP-ribose) polymerase-1 in longevity. Int J Biochem Cell Biol, 2005, 1043-1053.
- D’Errico, M; Parlanti, E; Teson, M; Degan, P; Lemma, T; Calcagnile, A; Iavarone, I; Jaruga, P; Ropolo, M; Pedrini, AM; Orioli, D; Frosina, G; Zambruno, G; Dizdaroglu, M, Stefanini, M; Dogliotti, E. The role of CSA in the response to oxidative DNA damage in human cells. Oncogene, 2007, 26, 4336-4343.
- Dolle, MET; Busuttil, RA; Garcia, AM; Wijnhoven, S; van Drunen, E; Niedernhofer, LJ; van der Horst, G; Hoeijmakers, JHJ; van Steeg, H; Vijg, J. Increased genomic instability is not a prerequisite for shortened lifespan in DNA repair deficient mice. Mutat Res, 2006, 596, 22-35.
- Dolle, MET; Giese, H; Hopkins, CL; Martus, HJ; Hausdorff, JM; Vijg, J. Rapid accumulation of genome rearrangements in liver but not in brain of old mice. Nature Genetics, 1997, 17, 431-434.
- Freitas AA; de Magalhães JP. A review and appraisal of the DNA damage theory of ageing. Mutat Res, 2011, 728(1-2), 12-22.
- Gensler, HL; Bernstein, H. DNA damage as the primary cause of aging. Q Rev Biol, 1981, 56, 279-303.
- Hamilton, ML; Van Remmen, H; Drake, JA; Yang, H; Guo, ZM; Kewitt, K; Walter, CA; Richardson, A. Does oxidative damage to DNA increase with age? Proc Natl Acad Sci USA, 2001, 98, 10469-10474.
- Harrigan, JA; Wilson, DM; Prasad, R; Opresko, PL; Beck, G; May, A; Wilson, SH; Bohr, VA. The Werner syndrome protein operates in base excision repair and cooperates with DNA polymerase b. Nucleic Acids Res, 2006, 745-754.
- Hart, RN; Setlow, RB. Correlation between deoxyribonucleic acid excision-repair and lifespan in a number of mammalian species. Proc Natl Acad Sci USA, 1974, 71, 2169-2173.
- Hashimoto, K; Takasaki, W; Sato, I; Tsuda, S. DNA damage measured by comet assay and 8-OH-dG formation related to blood chemical analyses in aged rats. J Toxicol Sci, 2007, 32, 249-259.
- Helbock, HJ; Beckman , KB; Shigenaga, MK; Walter, PB; Woodall, AA; Yeo, HC; Ames, BN. DNA oxidation matters: the HPLC-electrochemical detection assay of 8-oxo-deoxyguanosine and 8-oxo-guanine. Proc Natl Acad Sci USA, 1998, 95, 288-293.
- Hill, KA; Halangoda, A; Heinmoeller, PW; Gonzalez, K; Chitaphan, C; Longmate, J; Scaringe, WA; Wang, JC; Sommer, SS. Tissue specific time courses of spontaneous mutation frequency and deviations in mutation pattern are observed in middle to late adulthood in big blue mice. Environ Mol Mutagen, 2005, 45, 442-454.
- Holmes, GE; Bernstein, C; Bernstein, H. Oxidative and other DNA damages as the basis of aging: a review. Mutat Res, 1992, 275, 305-315.
- Linford, NJ; Schriner, SE; Rabinovitch, PS. Oxidative damage and aging: Spotlight on mitochondria. Cancer Res, 2006, 66, 2497-2499.
- Liu, Y; Wang, Y; Rusinol, AE; Sinensky, MS; Liu, J; Shell, SM; Zou, Y. Involvement of xerodema pigmentosum group A (XPA) in progeria arising from defective maturation of Prelamin A. FASEB J, 2008, 22, 000-000 (Published on line 9/11/2007)
- Lu, T; Pan, Y; Kao, SY; Li, C; Kohane, I; Chan, J; Yankner, BA. Gene regulation and DNA damage in the ageing human brain. Nature, 2004, 429, 883-891.
- Mecocci, P; Fano, G; Fulle, S; MacGarvey, U; Shinobu, L; Polidori, MC; Cherubini, A; Vecchiet, J; Senin, U; Beal, MF. Age-dependent increases in oxidative damage to DNA, lipids, and proteins in human skeletal muscle. Free Radic Biol Med, 1999, 26, 303-308.
- Mecocci, P; MacGarvey, U; Kaufman, AE; Koontz, D; Shoffner, JM; Wallace, DC; Beal, MF. Oxidative damage to mitochondrial DNA shows marked age-dependent increases in human brain. Ann Neurol, 1993, 34, 609-616.
- Mostoslavsky, R; Chua, KF; Lombard, DB; Pang, WW; Fischer, MR; Gellon, L; Liu, P; Mostoslavsky, G; Franco, S; Murphy, MM; Mills, KD; Patel, P; Hsu, JT; Hong, AL; Ford, E; Cheng, HL; Kennedy, C; Nunez,N; Bronson, R; Frendewey, D; Auerbach, W; Valenzuela, D; Karow, M; Hottiger, MO; Hursting, S; Barrett, JC; Guarantee, L; Mulligan, R; Demple, B; Yancopoulos, GD; Alt, FW. Genomic instability and aging-like phenotype in the absence of mammalian SIRT6. Cell, 2006, 124, 315-329.
- Narayanan, L; Fritzell, JA; Baker, SM; Liskay, RM; Glazer, PM. Elevated levels of mutation in multiple tissues of mice deficient in the DNA mismatch repair gene Pms2. Proc Natl Acad Sci USA, 1997a, 94, 3122-3127.
- Niedernhofer, LJ; Garinis, GA; Raams, A; Lalai, AS; Robinson, AR; Appeldoorn, E; Odijk, H; Oostendorp, R; Ahmad, A; van Leeuwen, W; Theil, AF; Vermeulen, W; van der Horst, GTJ; Meinecke, P; Kleijer, WJ; Vijg, J; Jaspers, NGJ; Hoeijmakers, JHJ. A new progeroid syndrome reveals that genotoxic stress suppresses the somatotroph axis. Nature, 2006, 444, 1038-1043.
- Piec, I; Listrat, A; Alliot, J; Chambon, C; Taylor , RG; Bechet, D. Differential proteome analysis of aging in rat skeletal muscle. FASEB J, 2005, 19, 1143-1145.
- Rao, KS; Loeb, LA. DNA damage and repair in brain: relationship to aging. Mutat. Res, 1992, 275, 317-329.
- Rossi, DJ; Bryder, D: Seita, J; Nussenzweig, A; Hoeijmakers, Weissman, IL. Deficiencies in DNA damage repair limit the function of haematopoietic stem cells with age. Nature, 2007, 447, 725-730.
- Rutten, BPF; Schmitz, C; Gerlach, OHH; Oyen, HM; de Mesquita, EB; Steinbusch, HWM; Korr, H. The aging brain: accumulation of DNA damage or neuron loss? Neurobiology of Aging, 2007, 28, 91-98.
- Schriner, SE; Linford, NJ; Martin, GM; Treuting, P; Ogburn, CE; Emond, M; Coskun, PE; Ladiges, W; Wolf, N; van Remmen, H; Wallace, DC; Rabinovitch, PS. Extension of murine life span by overexpression of catalase targeted to mitochondria. Science, 2005, 308, 1909-1911.
- Sen, T; Jana, S; Sreetama, S; Chatterjee, U; Chakrabarti, S. Gene specific oxidative lesions in aged rat brain detected by polymerase chain reaction inhibition assay. Free Radical Res, 2007, 41, 288-294.
- Sharpless, NE; DePinho, RA. How stem cells age and why this makes us grow old. Nat Rev Mol Cell Biol, 2007, 8, 703-713.
- Stuart, GR; Oda, Y; deBoer, JG; Glickman, BW. Mutation frequency and specificity with age in liver, bladder and brain of lacI transgenic mice. Genetics, 2000, 154, 1291-1300.
- Vermulst, M; Bielas, JH; Kujoth, GC; Ladiges, WC; Rabinovitch, PS; Prolla, TA; Loeb, LA. Mitochondrial point mutations do not limit the natural lifespan of mice. Nature Genetics, 2007, 39, 540-543.
- Vilenchik, MM; Knudson AG Jr. Inverse radiation dose-rate effects on somatic and germ-line mutations and DNA damage rates. Proc Natl Acad Sci USA, 2000, 97, 5381-5386.
- Vogel, H; Lim, DS; Karsenty, G; Finegold, M; Hasty, P. Deletion of Ku80 causes early onset of senescence in mice. Proc Natl Acad Sci USA, 1999, 96, 10770-10775.
- Wolf, FI; Fasanella, S; Tedesco, B; Cavallini, G; Donati, A; Bergamini, E; Cittadini, A. Peripheral lymphocyte 8-OHdG levels correlate with age-associated increase of tissue oxidative DNA damage in Sprague-Dawley rats. Protective effects of caloric restriction. Exp Gerontol, 2005, 40, 181-188.
Wikimedia Foundation. 2010.
Look at other dictionaries:
DNA repair — For the journal, see DNA Repair (journal). DNA damage resulting in multiple broken chromosomes DNA repair refers to a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome. In human… … Wikipedia
DNA oxidation — is the process of oxidative damage on Deoxyribonucleic Acid. It occurs most readily at guanine residues due to the high oxidation potential of this base relative to cytosine, thymine, and adenine. It is widely believed to be linked to certain… … Wikipedia
aging — ag·ing (āʹjĭng) n. 1. The process of growing old or maturing. 2. An artificial process for imparting the characteristics and properties of age. * * * Gradual change in an organism that leads to increased risk of weakness, disease, and death. It… … Universalium
Rejuvenation (aging) — Rejuvenation is the procedure of reversing the aging process, thus regaining youth. As people get older, their health worsens, strength and intelligence generally diminish, and beauty is thought by many to go away. Rejuvenation is distinct from… … Wikipedia
Mitochondrial DNA — Human mitochondrial DNA … Wikipedia
Metabolic theory of ecology — The metabolic theory of ecology (MTE) is an extension of Kleiber s law and posits that the metabolic rate of organisms is the fundamental biological rate that governs most observed patterns in ecology. MTE is based on an interpretation of the… … Wikipedia
Maximum life span — is a measure of the maximum amount of time one or more members of a population has been observed to survive between birth and death. Most living species have at least one upper limit on the number of times cells can divide. For humans, this is… … Wikipedia
Outline of life extension — See also: Index of life extension related articles The following outline is provided as an overview of and topical guide to life extension: Life extension – study of slowing down or reversing the processes of aging to extend both the maximum and… … Wikipedia
Biological immortality — refers to a stable rate of mortality as a function of chronological age. Some individual cells and entire organisms in some species achieve this state either throughout their existence or after living long enough. This requires that death occur… … Wikipedia
Longevity — The word longevity is sometimes used as a synonym for life expectancy in demography. However, this is not the most popular or accepted definition. [ [http://www.answers.com/topic/longevity?cat=health. longevity: Definition and Much More from… … Wikipedia