Rauch Cessa, Christa Gregor, de Vries Jan, Woehle Christian, Gould Sven B
Institute for Molecular Evolution, Heinrich-Heine-University Düsseldorf, Germany.
Department of Biology and CESAM, University of Aveiro, Portugal.
Genome Biol Evol. 2017 Jul 1;9(7):1873-1879. doi: 10.1093/gbe/evx129.
Some sacoglossan sea slugs sequester functional plastids (kleptoplasts) from their food, which continue to fix CO2 in a light dependent manner inside the animals. In plants and algae, plastid and mitochondrial metabolism are linked in ways that reach beyond the provision of energy-rich carbon compounds through photosynthesis, but how slug mitochondria respond to starvation or alterations in plastid biochemistry has not been explored. We assembled the mitochondrial genomes of the plastid-sequestering sea slugs Elysia timida and Elysia cornigera from RNA-Seq data that was complemented with standard sequencing of mitochondrial DNA through primer walking. Our data confirm the sister species relationship of the two Sacoglossa and from the analysis of changes in mitochondrial-associated metabolism during starvation we speculate that kleptoplasts might aid in the rerouting or recycling of reducing power independent of, yet maybe improved by, photosynthesis.
一些囊舌类海蛞蝓会从它们的食物中摄取功能性质体（盗食质体），这些质体在动物体内以光依赖的方式继续固定二氧化碳。在植物和藻类中，质体和线粒体代谢的联系不仅限于通过光合作用提供富含能量的碳化合物，但海蛞蝓线粒体如何应对饥饿或质体生物化学变化尚未得到探索。我们从RNA测序数据中组装了摄取质体的海蛞蝓——柔弱艾氏海牛（Elysia timida）和角突艾氏海牛（Elysia cornigera）的线粒体基因组，并通过引物步移法对线粒体DNA进行标准测序作为补充。我们的数据证实了这两种囊舌类动物的姐妹物种关系，并且通过对饥饿期间线粒体相关代谢变化的分析，我们推测盗食质体可能有助于还原力的重新导向或循环利用，这种过程独立于光合作用，但可能会因光合作用而得到改善。
