Print Email Facebook Twitter DNA damage metabolism and aging Title DNA damage metabolism and aging Author Medisch Biologisch Laboratorium TNO Mullaart, E. Lohman, P.H.M. Berends, F. Vijg, J. Publication year 1990 Abstract As a result of permanent exposure to low levels of various endogenous and exogenous genotoxic agents, large numbers of lesions are continuously induced in the DNA of cells of living organisms. Such lesions could lead to dysfunction of cells and tissues, and they might well be the underlying cause of the age-related reduction of homeostatic capacity and the increased incidence of cancer and other diseases of old age. The rate of damage induction as well as the persistence of the lesions depends on the activity, efficiency and reliability of a wide variety of molecular defense systems. However, a certain degree of imperfection seems to be a general characteristic of most of these defense systems and this could lead to a gradual accumulation of DNA alterations during aging. Even when the original lesions are quickly removed, they can still lead to secondary changes in the DNA, such as DNA-sequence changes and changes in gene expression. This process would be accelerated in case of the occurrence of an age-related decline in the efficiency of these molecular defense systems. This review deals with the present knowledge on the occurrence of 'spontaneous' DNA damage in aging organisms, its potential sources, the influence of preventive and processive cellular defense mechanisms and its consequences in terms of DNA-sequence changes, DNA conformational and configurational changes and changes in gene expression. In general, it can be concluded from the data discussed here that, in spite of a number of discrepancies and conflicting results, an age-related accumulation of DNA alterations occurs at all levels, e.g., chemical structure, DNA-sequence organization and gene expression. Subject DNA lesionsAgingCell and tissue dysfunctioningDiseasesDNA damage accumulationDNA metabolismMutationsAgeAnimal experimentDNA damageDNA repairGene expressionHumanNonhumanPriority journalReviewAgingAnimalDNAAnimalia To reference this document use: http://resolver.tudelft.nl/uuid:aa692e17-e132-413c-883b-ff7c0fa16e9f TNO identifier 231302 ISSN 0921-8734 Source Mutation Research - DNAging Genetic Instability and Aging, 237 (237), 189-210 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.