Three widely accepted assumptions are based on telomere research in human cells: (i) telomere length is a determinant of replicative ageing; (ii) telomerase activity in somatic cells supports the proliferative capacity of the cells and thus contributes to their regenerative potential and is a determinant of organismal lifespan; and (iii) the lack of telomerase activity acts as a tumour suppression mechanism. However, from a broader view, the link between telomere biology and cellular and organismal ageing, as well as tumour development, remains of debate, as I demonstrate with numerous examples of invertebrate and vertebrate species. Consequently, I propose a novel hypothesis that telomere biology, via somatic telomerase activity, reflects ageing rate from the perspective of species reproduction strategy.

Biology Centre of the Czech Academy of Sciences Institute of Entomology České Budějovice Czech Republic

Faculty of Science University of South Bohemia České Budějovice Czech Republic

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Telomeres and telomerase: active but complex players in life-history decisions

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