This describes the cumulative alterations in gene expression, epigenetic markers, and genomic stability that occur naturally as an organism progresses through its lifespan. In the context of endocrinology, these changes frequently impact the sensitivity and output of endocrine glands and target tissues. Understanding these shifts is foundational to addressing functional decline.
Origin
The study originates from the disciplines of molecular biology and epigenetics, observing how environmental and temporal factors modify the transcriptome over time. These modifications reflect the cell’s cumulative history of signaling and stress exposure. The term acknowledges that aging is an active, programmed process at the genetic level.
Mechanism
Changes manifest through processes like telomere attrition, accumulation of somatic mutations, and alterations in DNA methylation patterns, particularly near key regulatory elements for metabolic and steroidogenic genes. These molecular events can lead to dysregulated feedback loops within the hypothalamic-pituitary axis. Consequently, this alters the physiological set-points for homeostasis.
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