The model marine diatom Thalassiosira pseudonana likely descended from a freshwater ancestor in the genus Cyclotella.
The model marine diatom Thalassiosira pseudonana likely descended from a freshwater ancestor in the genus Cyclotella.
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DOI：
10.1186/1471-2148-11-125
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发表时间：
2011-05-14
影响因子：
3.4
通讯作者：
Theriot EC
中科院分区：
文献类型：
--
作者：
Alverson AJ;Beszteri B;Julius ML;Theriot EC
第一个硅藻基因组的发表，即伪海藻的基因组，确立了它作为硅藻实验和基因组研究的模式物种。实际上，随后的每一项研究都将假单胞菌视为一种海洋硅藻，其基因组和实验数据因其对世界海洋中硅藻的生态学和进化的见解而具有价值。假单胞藻的自然分布在海洋和淡水中，形态和分子数据的系统发育分析表明，1)假单胞藻标志着硅藻在主要淡水辐射中的早期分化；2)作为一个物种，假单胞藻可能起源于淡水。因此，海洋菌株代表了最近高盐度栖息地的再定殖。此外，一个相对难以描述的形式和一个复杂的分类历史的结合已经引入了一些关于假假单胞菌的身份，并引证其系统发育和生态学的混乱。我们解决了这些问题，并使用系统发育标准，以显示T. pseudonana是更合适的分类，其原始名称，Cyclotella娜娜。Cyclotella包含海洋和淡水物种的混合，因此更准确地传达了假单胞菌的系统发育和自然历史的复杂性。硅藻要成功地在淡水中定居，可能必须克服大量的物理障碍，这表明假单胞菌的生理特征以及这些特征背后的基因可能与严格意义上的海洋硅藻不同。因此，假单胞藻的淡水祖先可能会混淆关于海洋硅藻生理和代谢特性的概括。在解释为这一重要模式物种收集的实验数据时，假单胞菌历史的淡水成分值得仔细考虑。
Publication of the first diatom genome, that of Thalassiosira pseudonana, established it as a model species for experimental and genomic studies of diatoms. Virtually every ensuing study has treated T. pseudonana as a marine diatom, with genomic and experimental data valued for their insights into the ecology and evolution of diatoms in the world's oceans. The natural distribution of T. pseudonana spans both marine and fresh waters, and phylogenetic analyses of morphological and molecular datasets show that, 1) T. pseudonana marks an early divergence in a major freshwater radiation by diatoms, and 2) as a species, T. pseudonana is likely ancestrally freshwater. Marine strains therefore represent recent recolonizations of higher salinity habitats. In addition, the combination of a relatively nondescript form and a convoluted taxonomic history has introduced some confusion about the identity of T. pseudonana and, by extension, its phylogeny and ecology. We resolve these issues and use phylogenetic criteria to show that T. pseudonana is more appropriately classified by its original name, Cyclotella nana. Cyclotella contains a mix of marine and freshwater species and so more accurately conveys the complexities of the phylogenetic and natural histories of T. pseudonana. The multitude of physical barriers that likely must be overcome for diatoms to successfully colonize freshwaters suggests that the physiological traits of T. pseudonana, and the genes underlying those traits, might differ from those of strictly marine diatoms. The freshwater ancestry of T. pseudonana might therefore confound generalizations about the physiological and metabolic properties of marine diatoms. The freshwater component of T. pseudonana's history merits careful consideration in the interpretation of experimental data collected for this important model species.
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影响因子：
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