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In some species, the enzyme telomerase is expressed in adult somatic tissues, and potentially protects or lengthens telomeres. Telomeres can be damaged by ionizing radiation and oxidative stress, although the effect of chronic exposure to elevated levels of radiation on telomere maintenance is unknown for natural populations. We quantified telomerase expression and telomere length (TL) in different tissues of the bank vole <jats:italic>Myodes glareolus<\/jats:italic>, collected from the Chernobyl Exclusion Zone, an environment heterogeneously contaminated with radionuclides, and from uncontaminated control sites elsewhere in Ukraine. Inhabiting the Chernobyl Exclusion Zone was associated with reduced TL in the liver and testis, and upregulation of telomerase in brain and liver. Thus upregulation of telomerase does not appear to associate with longer telomeres but may reflect protective functions other than telomere maintenance or an attempt to maintain shorter telomeres in a stressful environment. Tissue specific differences in the rate of telomere attrition and apparent radiosensitivity weaken the intra-individual correlation in telomere length among tissues in voles exposed to radionuclides. Our data show that ionizing radiation alters telomere homeostasis in wild animal populations in tissue specific ways.<\/jats:p>","DOI":"10.1038\/s41598-018-37164-8","type":"journal-article","created":{"date-parts":[[2019,1,29]],"date-time":"2019-01-29T11:03:17Z","timestamp":1548759797000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":43,"title":["Exposure to environmental radionuclides associates with tissue-specific impacts on telomerase expression and telomere length"],"prefix":"10.1038","volume":"9","author":[{"given":"Jenni","family":"Kes\u00e4niemi","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9524-8054","authenticated-orcid":false,"given":"Anton","family":"Lavrinienko","sequence":"additional","affiliation":[]},{"given":"Eugene","family":"Tukalenko","sequence":"additional","affiliation":[]},{"given":"Zbyszek","family":"Boraty\u0144ski","sequence":"additional","affiliation":[]},{"given":"Kati","family":"Kivisaari","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5936-7355","authenticated-orcid":false,"given":"Tapio","family":"Mappes","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2342-2615","authenticated-orcid":false,"given":"Gennadi","family":"Milinevsky","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3739-4675","authenticated-orcid":false,"given":"Anders Pape","family":"M\u00f8ller","sequence":"additional","affiliation":[]},{"given":"Timothy A.","family":"Mousseau","sequence":"additional","affiliation":[]},{"given":"Phillip C.","family":"Watts","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2019,1,29]]},"reference":[{"key":"37164_CR1","doi-asserted-by":"publisher","first-page":"1456","DOI":"10.1016\/j.yexcr.2012.02.015","volume":"318","author":"VA Zakian","year":"2012","unstructured":"Zakian, V. 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