Telomere elongation during early development is independent of environmental temperatures in Atlantic salmon
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 les...
Published in: | Journal of Experimental Biology |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The Company of Biologists Ltd
2018
|
Subjects: | |
Online Access: | http://journals.biologists.com/jeb/article-pdf/doi/10.1242/jeb.178616/1902368/jeb178616.pdf https://jeb.biologists.org/content/jexbio/221/11/jeb178616.full.pdf http://eprints.gla.ac.uk/161022/1/161022.pdf http://europepmc.org/articles/PMC6031317 https://syndication.highwire.org/content/doi/10.1242/jeb.178616 https://doi.org/10.1242/jeb.178616 https://jeb.biologists.org/content/221/11/jeb178616 https://www.ncbi.nlm.nih.gov/pubmed/29636409 http://eprints.gla.ac.uk/161022/ https://academic.microsoft.com/#/detail/2795062021 |
Summary: | 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 (Salmo salar) 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. Summary: The authors show that, in salmon, telomeres significantly lengthen between the embryonic and larval stages of development, and that this is not influenced by environmental temperature. |
---|