Telomere biology in mammalian germ cells and during development

Developmental Biology
Sofie BekaertSarah Baatout

Abstract

The development of an organism is a strictly regulated program in which controlled gene expression guarantees the establishment of a specific phenotype. The chromosome termini or so-called telomeres preserve the integrity of the genome within developing cells. In the germline, during early development, and in highly proliferative organs, human telomeres are balanced between shortening processes with each cell division and elongation by telomerase, but once terminally differentiated or mature the equilibrium is shifted to gradual shortening by repression of the telomerase enzyme. Telomere length is to a large extent genetically determined and the neonatal telomere length equilibrium is, in fact, a matter of evolution. Gradual telomere shortening in normal human somatic cells during consecutive rounds of replication eventually leads to critically short telomeres that induce replicative senescence in vitro and probably in vivo. Hence, a molecular clock is set during development, which determines the replicative potential of cells during extrauterine life. Telomeres might be directly or indirectly implicated in longevity determination in vivo, and information on telomere length setting in utero and beyond should help elucidate pres...Continue Reading

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