ArticleJournal of comparative physiology. B, Biochemical, systemic, and environmental physiology2015
Membrane properties of Enchytraeus albidus originating from contrasting environments: a comparative analysis.
Article in Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Aquaporins modulate the cold response of Haemaphysalis longicornis via changes in gene and protein expression of fatty acids.Parasites & vectors · 2025Article
- Analysis of heat and cold tolerance of a freeze-tolerant soil invertebrate distributed from temperate to Arctic regions: evidence of selection for extreme cold tolerance.Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology · 2022Article
- Annelid genomes: Enchytraeus crypticus, a soil model for the innate (and primed) immune system.Lab animal · 2021Article
- Overwintering adaptations and extreme freeze tolerance in a subarctic population of the wood frog, Rana sylvatica.Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology · 2019Review
- Population-specific transcriptional differences associated with freeze tolerance in a terrestrial worm.Ecology and evolution · 2018Article
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Authors and funding
6 authors.
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Abstract
Ectothermic animals adapted to different environmental temperatures are hypothesized to have biological membranes with different chemical and physical properties such that membrane properties are optimized for their particular thermal environments. To test this hypothesis we analyzed the composition of phospholipid fatty acids (PLFAs) in seven different populations of Enchytraeus albidus originating from different thermal environments. The seven populations differ markedly in origin (polar-temperate) and are also characterized by marked difference in cold tolerance. The dominant PLFAs of E. albidus were C20:5, C20:4 and C20:2 (53-61% of total PLFA) followed by C18:0, C20:1 and C22:2 (17-20% of total PLFA). As hypothesized the PLFA composition varied significantly between populations and molar percentage of several of the PLFAs (particularly C18:2) correlated with the lower lethal temperature (LT50) of the seven populations. Unsaturation ratio (UFA/SFA) and average PLFA chain length also correlated significantly with LT50, such that cold sensitive populations had a shorter chain length and a lower UFA/SFA compared to cold tolerant populations. Reconstituted membranes of the least and most cold tolerant populations were used to compare membranes' physical properties by fluorescence anisotropy and bending rigidity. Measurements of anisotropy did not show any overall difference between populations with different cold tolerance. This could be interpreted as if E. albidus populations have achieved a similar "optimal" fluidity of the membrane with a somewhat different PLFA composition. Our study suggests that membrane lipid composition could be important for the cold tolerance of E. albidus; however, these differences are not easily differentiated in the measurements of the membranes' physical properties. Other parameters such as accumulation of glucose for cryoprotection and energy supply may also be important components of enchytraeid freeze tolerance.
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