Abstract
Gerontological experimentation is and was always strongly influenced by “theories”. The early decades of molecular genetics inspired deterministic thinking, based on the “Central Dogma” (DNA → RNA → Proteins). With the progress of detailed knowledge of gene-function a much more complicated picture emerged. Regulation of gene-expression turned out to be a highly complicated process. Experimental gerontology produced over the last decades several “paradigms” incompatible with simple genetic determinism. The increasing number of such detailed experimental “facts” revealed the importance of epigenetic factors and of posttranslational modifications in the age-dependent decline of physiological functions. We shall present in this review a short but critical analysis of genetic and epigenetic processes applied to the interpretation of the more and more precisely elucidated experimental paradigms of aging followed by some of the most relevant aging-mechanisms at the post-translational level, the posttranslational modifications of proteins such as the Maillard reaction, the proteolytic production of harmful peptides and the molecular mechanisms of the aging of elastin with the role of the age-dependent uncoupling of the elastin receptor, as well as the loss of several other receptors. We insist also on the well documented influence of posttranslational modifications on gene expression and on the role of non-coding RNA-s. Altogether, these data replace the previous simplistic concepts on gene action as related to aging by a much more complicated picture, where epigenetic and posttranslational processes together with environmentally influenced genetic pathways play key-roles in aging and strongly influence gene expression.
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Abbreviations
- JH:
-
Juvenile hormone
- ECM:
-
Extracellular matrix
- CR:
-
Calorie restriction
- nc-RNA:
-
Non coding RNA-s
- RNAi :
-
RNA-interference
- mTOR:
-
Mammalian target of rapamycin
- S6K1 :
-
A ribosomal S6-protein kinase
- CNV:
-
Copy number variation
- SNP:
-
Single nucleotide polymorphism
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Acknowledgments
The original experiments reported in this review were carried out in our CNRS Laboratory at University Paris XII and at the Hotel Dieu Hospital, Univ. Paris 5, Paris, supported by Institut DERM. The hospitality of Prof. Gilles Renard, Head of Ophthalmology at Hotel Dieu is thankfully acknowledged.
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Corresponding to a lecture delivered at the Congress of the International Association of Gerontology and Geriatrics (IAGG) in Paris in July 2009.
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Robert, L., Labat-Robert, J. & Robert, A.M. Genetic, epigenetic and posttranslational mechanisms of aging. Biogerontology 11, 387–399 (2010). https://doi.org/10.1007/s10522-010-9262-y
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DOI: https://doi.org/10.1007/s10522-010-9262-y