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oai:repisalud.isciii.es:20.500.12105/78682024-11-29T16:03:02Zcom_20.500.12105_2173com_20.500.12105_2051col_20.500.12105_19597

00925njm 22002777a 4500 dc Varela, Elisa author Muñoz-Lorente, Miguel A author Tejera, Agueda author Ortega Jimenez, Sagrario author Blasco , MA author 2016 Although telomere length is genetically determined, mouse embryonic stem (ES) cells with telomeres of twice the normal size have been generated. Here, we use such ES cells with 'hyper-long' telomeres, which also express green fluorescent protein (GFP), to generate chimaeric mice containing cells with both hyper-long and normal telomeres. We show that chimaeric mice contain GFP-positive cells in all mouse tissues, display normal tissue histology and normal survival. Both hyper-long and normal telomeres shorten with age, but GFP-positive cells retain longer telomeres as mice age. Chimaeric mice with hyper-long telomeres also accumulate fewer cells with short telomeres and less DNA damage with age, and express lower levels of p53. In highly renewing compartments, such as the blood, cells with hyper-long telomeres are longitudinally maintained or enriched with age. We further show that wound-healing rates in the skin are increased in chimaeric mice. Our work demonstrates that mice with functional, longer and better preserved telomeres can be generated without the need for genetic manipulations, such as TERT overexpression. Nat Commun. 2016;7:11739 10.1038/ncomms11739 2041-1723 2041-1723 Nature communications 27252083 http://hdl.handle.net/20.500.12105/7868 Generation of mice with longer and better preserved telomeres in the absence of genetic manipulations