ECB-ART-37747
Lipids
2001 Jan 01;361:79-82. doi: 10.1007/s11745-001-0671-2.
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Biosynthesis of eicosapentaenoic acid in the sea urchin Psammechinus miliaris.
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The sea urchin Psammechinus miliaris (Gmelin) (Echinodermata: Echinoidea) was shown by using a deuterated tracer (D5-18:3n-3) and quantitation by negative chemical ionization gas chromatography-mass spectrometry to convert 18:3n-3 to 20:5n-3. The rate of conversion was very slow, corresponding to 0.09 microg/g tissue/mg 18:3n-3 eaten over 14 d. Deuterated arachidonic acid (D8-20:4n-6) was also included in the diet to give a measure of the relative amounts of diet eaten by the different animals. The recovery of this fatty acid in tissue lipids was 33.7% compared with only 0.95% recovery of D5-18:3n-3 and its anabolites, indicating that the majority of the D5-tracer was catabolized. Considerable elongation of D5-18:3n-3 into 20:3n-3 and a trace of 22:3n-3 was found, and these were accompanied by minor amounts of the intermediates 18:4n-3 and 20:4n-3. No deuterated 22:6n-3 was found.
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Genes referenced: LOC100887844
References [+] :
Cook,
Fatty acid compositions of gonadal material and diets of the sea urchin, Psammechinus miliaris: trophic and nutritional implications.
2000, Pubmed,
Echinobase