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FA composition of heart and skeletal muscle during embryonic development of the king penguin
Frederic Decrock1, Rene Groscolas, Brian K Speake
1Centre d'Ecologie et Physiologie Energétiques, Centre National de la Recherche Scientifique, Associé à l'Université Louis Pasteur, Strasbourg, France.
Insights
King penguin eggs have high levels of omega-3 fatty acids, influencing embryonic development. This study examined how these fatty acids affect the heart and muscle tissue of developing penguin embryos.
Area of Science:
- * Marine Biology
- * Avian Physiology
- * Nutritional Biochemistry
Background:
- * King penguin (Aptenodytes patagonicus) eggs possess the highest reported concentrations of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) among avian species.
- * These omega-3 (n-3) rich yolks are hypothesized to impact embryonic development.
- * Understanding these effects is crucial for avian reproductive biology and nutritional studies.
Purpose of the Study:
- * To investigate the impact of n-3 rich egg yolk on the fatty acid (FA) profiles in the embryonic heart and skeletal muscle of king penguins.
- * To compare these profiles with those of chicken embryos to highlight species-specific adaptations.
Main Methods:
- * Analysis of phospholipid (PL) and triacylglycerol (TAG) concentrations in heart, leg, and pectoral muscle tissues at different embryonic developmental stages (days 27 and 55).
- * Gas chromatography was used to determine the fatty acid composition, focusing on polyunsaturated fatty acids like arachidonic acid (ARA), DHA, and EPA.
- * Comparative analysis with existing data from chicken embryos.
Main Results:
- * Phospholipid concentrations in penguin embryonic heart and leg muscle doubled between days 27 and 55, while TAG decreased in the heart but increased in leg and pectoral muscles.
- * Pectoral muscle showed a significant ninefold increase in cholesteryl ester concentration during the same period.
- * Penguin embryonic heart and muscle tissues achieved high arachidonic acid (ARA) levels, but also contained significant amounts of DHA and EPA, unlike chicken embryos which were largely devoid of EPA.
Conclusions:
- * The high n-3 content of king penguin egg yolk significantly influences the fatty acid profiles of embryonic heart and skeletal muscle.
- * Despite achieving high ARA concentrations, the n-3 fatty acids from the yolk play a substantial role in shaping the FA composition of developing penguin tissues.
- * These findings highlight unique nutritional adaptations in king penguin embryonic development compared to other avian species.
Abstract:
Since the yolk lipids of the king penguin (Aptenodytes patagonicus) naturally contain the highest concentrations of DHA and EPA yet reported for the eggs of any avian species, the effects of this (n-3)-rich yolk on the FA profiles of the embryonic heart and skeletal muscle were investigated. The concentrations (mg/g wet tissue) of phospholipid (PL) in the developing heart and leg muscle of the penguin doubled between days 27 and 55 from the beginning of egg incubation (i.e., from the halfway stage of embryonic development to 2 d posthatch), whereas no net increase occurred in pectoral muscle. During this period, the concentration of TAG in heart decreased by half but increased two- and sixfold in leg and pectoral muscle, respectively. The most notable change in cholesteryl ester concentration occurred in pectoral muscle, increasing ninefold between days 27 and 55. Arachidonic acid (ARA) was the major polyunsaturate in PL of the penguin's heart, where it formed about 20% (w/w) of FA at day 55. At the equivalent developmental stage, the heart PL of the chicken contained a 1.3-fold greater proportion of ARA, contained a fifth less DHA, and was almost devoid of EPA, whereas the latter FA was a significant component (7% of FA) of penguin heart PL. Similarly, in PL of leg and pectoral muscle, the chicken displayed about 1.4-fold more ARA, up to 50% less DHA, and far less EPA in comparison with the penguin. Thus, although ARA-rich PL profiles are achieved in the heart and muscle of the penguin embryo, these profiles are significantly affected by the high n-3 content of the yolk.
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