A hypervariable mitochondrial protein coding sequence associated with geographical origin in a cosmopolitan bloom-forming alga, Heterosigma akashiwo
A hypervariable mitochondrial protein coding sequence associated with geographical origin in a cosmopolitan bloom-forming alga, Heterosigma akashiwo
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DOI：
10.1098/rsbl.2016.0976
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发表时间：
2017-04-01
期刊：
影响因子：
3.3
通讯作者：
Ueki, Shoko
中科院分区：
文献类型：
--
作者：
Higashi, Aiko;Nagai, Satoshi;Ueki, Shoko
浮游植物物种的地理分布可以通过进化时间和较短尺度的事件来确定，例如最近的气候变化。此外，现代工业活动，包括运输用于水产养殖的活鱼和唾液以及船舶压载水中的水生微生物，可能有助于浮游植物的传播。获得一个可靠的标记是深入了解一个物种的系统地理历史的关键。在这里，我们报告了一个超变线粒体基因在世界性的开花形成的藻类，赤谷异西格玛。我们比较了7个H。赤潮菌株来自日本和北美沿海水域，并鉴定出一个高变段。该区域编码一种功能不明确的假设蛋白，其序列在日本和北美分离株之间差异显著，而在日本和北美分离株之间更为保守。从北半球不同地理点获得的分离株序列比较表明，序列变化主要与纬度和经度（即太平洋/大西洋）相关。我们的结果证明了该序列在确定赤岛人的系统地理历史方面的有效性。
Geographical distributions of phytoplankton species can be defined by events on both evolutionary time and shorter scales, e.g. recent climate changes. Additionally, modern industrial activity, including the transport of live fish and spat for aquaculture and aquatic microorganisms in ship ballast water, may aid the spread of phytoplankton. Obtaining a reliable marker is key to gaining insight into the phylogeographic history of a species. Here, we report a hypervariable mitochondrial gene in the cosmopolitan bloom forming alga, Heterosigma akashiwo. We compared the entire mitochondrial genome sequences of seven H.. akashiwo strains from Japanese and North American coastal waters and identified a hypervariable segment. The region codes for a hypothetical protein with no defined function, and its variations between Japanese and North American isolates were prominent, while the sequences were more conserved among Japanese strains and North American isolates. Comparison of the sequence in isolates obtained from different geographical points in the Northern Hemisphere revealed that the sequence variations largely correlated with latitude and longitude (i.e. Pacific/Atlantic oceans). Our results demonstrate the usefulness of the sequence in determining the phylogeographic history of H. akashiwo.