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首页> 外文期刊>Polar biology >Tracing of lipid markers of soft corals in a polar lipidome of the nudibranch mollusk Tritonia tetmquetra from the Sea of Okhotsk
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Tracing of lipid markers of soft corals in a polar lipidome of the nudibranch mollusk Tritonia tetmquetra from the Sea of Okhotsk

机译：鄂霍次克海裸udi科软体动物特立通体的极性脂质组中的软珊瑚脂质标记示踪

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摘要

To trace predatorprey interactions in the marine environment, fatty acids (FAs) were widely applied as qualitative markers. Recently, two tetracosapolyenoic acids (TPA), which are specific markers of soft corals, have been found in the nudibranch mollusk Tritonia tetraquetra collected in the deep waters of the Sea of Okhotsk. This mollusk does not synthesize TPA but preys mostly on the soft coral Gersemia fruticosa. Both invertebrates are common species in Arctic and boreal regions and may be a simple model for the investigation of FA marker transfer from one trophic level to another. A lipidomic approach was applied to study the transfer of the FA markers in this predator-prey system. The structure and content of the molecular species of polar lipids (polar lipidome) of both animal species were analyzed by high-performance liquid chromatography with high-resolution tandem mass spectrometry. The distribution of several principal FA markers in lipid molecular species was determined. C-20 monoenoic FAs of the coral were not integrated in the most of nudibranch lipids. Arachidonic and eicosapentaenoic acids mainly esterified ethanolamine and choline glycerophospholipids (PE and PC) in both invertebrates. In the coral polar lipidome, TPA concentrated in serine glycerophospholipids (PS). The nudibranch decomposed coral lipids and reallocated TPA to PS, PE, and PC. We suppose that this reallocation is responsible for the accumulation of TPA in the nudibranch. The nudibranch differed from the coral in biosynthetic relationships of phospholipid classes. The lipidomic approach explains the rearrangement of dietary FAs in the predator lipids. This rearrangement can be important for the trophic uptake and transfer of lipids in polar marine ecosystems.
机译：为了追踪海洋环境中的捕食者相互作用，脂肪酸（FAs）被广泛用作定性标记。最近，在鄂霍次克海深水区收集的裸n软体动物Tritonia tetraquetra中发现了两种软珊瑚的特殊标记物四粘多糖酸（TPA）。这种软体动物不能合成TPA，但主要捕食柔软的珊瑚Gersemia fruticosa。两种无脊椎动物都是北极和北方地区的常见物种，可能是研究FA标志物从一个营养级转移到另一个营养级的简单模型。脂质组学方法用于研究FA标记在此捕食者－猎物系统中的转移。通过高效液相色谱-高分辨率串联质谱法分析了两种动物的极性脂质（极性脂质组）的分子种类的结构和含量。确定了几种主要的FA标记在脂质分子种类中的分布。珊瑚的C-20单核FAs并未整合在大多数裸枝脂肪中。花生四烯酸和二十碳五烯酸主要在两种无脊椎动物中酯化了乙醇胺和胆碱甘油磷脂（PE和PC）。在珊瑚极性脂质组中，TPA集中在丝氨酸甘油磷脂（PS）中。裸bra分支分解了珊瑚脂质，并将TPA重新分配到PS，PE和PC。我们假设这种重新分配负责在裸枝中TPA的积累。裸枝与珊瑚在磷脂类的生物合成关系上有所不同。脂质组学的方法解释了饮食中脂肪酸在食肉动物脂质中的重排。这种重排对于营养摄取和极性海洋生态系统中脂质的转移可能很重要。

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