McLennan, D., Armstrong, J. D., Stewart, D. C., Mckelvey, S., Boner, W. , Monaghan, P. and Metcalfe, N. B. (2018) Telomere elongation during early development is independent of environmental temperatures in Atlantic salmon. Journal of Experimental Biology, 221, 178616. (doi: 10.1242/jeb.178616) (PMID:29636409) (PMCID:PMC6031317)
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Abstract
There is increasing evidence from endothermic vertebrates that telomeres, which cap the ends of chromosomes and play an important role in chromosome protection, decline in length during postnatal life and are a useful indicator of physiological state and expected lifespan. However, much less is currently known about telomere dynamics in ectothermic vertebrates, which are likely to differ from that of endotherms, at least in part due to the sensitivity of ectotherm physiology to environmental temperature. We report here on an experiment in which Atlantic salmon were reared through the embryonic and larval stages of development, and under differing temperatures, in order to examine the effects of environmental temperature during early life on telomere dynamics, oxidative DNA damage and cellular proliferation. Telomere length significantly increased between the embryonic and larval stages of development. Contrary to our expectations, variation in telomere length at the end of the larval stage was unrelated to either cell proliferation rate or the relative level of oxidative DNA damage, and did not vary between the temperature treatments. This study suggests that salmon are able to restore the length of their telomeres during early development, which may possibly help to buffer potentially harmful environmental effects experienced in early life.
| Item Type: | Articles |
|---|---|
| Keywords: | Cell proliferation, environmental effect, fish, oxidative stress, physiology. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Monaghan, Professor Pat and McLennan, Dr Darryl and Boner, Dr Winnie and Metcalfe, Professor Neil |
| Authors: | McLennan, D., Armstrong, J. D., Stewart, D. C., Mckelvey, S., Boner, W., Monaghan, P., and Metcalfe, N. B. |
| College/School: | College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine |
| Journal Name: | Journal of Experimental Biology |
| Publisher: | Company of Biologists |
| ISSN: | 0022-0949 |
| ISSN (Online): | 1477-9145 |
| Published Online: | 10 April 2018 |
| Copyright Holders: | Copyright © 2018 The Authors |
| First Published: | First published in Journal of Experimental Biology 221:178616 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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