A group of quantitative biological measurements used to assess the health and length of telomeres, the protective caps on the ends of chromosomes, which are a primary biomarker of cellular aging. These metrics evaluate the rate of telomere shortening and the functional activity of telomerase, the enzyme responsible for their maintenance. Clinical use of these metrics provides critical insight into the patient’s biological age and cellular replicative capacity.
Origin
The term is derived from “telomere” (from Greek telos ‘end’ and meros ‘part’) and “maintenance metrics” (the quantitative measures of their preservation). Its foundation lies in molecular biology and the Nobel Prize-winning research on telomeres and telomerase, which established their link to cellular senescence.
Mechanism
Telomere maintenance is a complex process primarily governed by the enzyme telomerase, which adds repetitive DNA sequences to the telomere ends, thereby counteracting the shortening that occurs with each cell division. Hormonal signaling, particularly by sex steroids and growth hormone, has been shown to positively influence telomerase activity. These metrics provide a tangible window into the cellular stress load and the body’s intrinsic ability to preserve genomic integrity and cellular function.
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