The genome of the diatom Thalassiosira pseudonana: ecology, evolution, and metabolism |
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| Authors: | Armbrust E Virginia Berges John A Bowler Chris Green Beverley R Martinez Diego Putnam Nicholas H Zhou Shiguo Allen Andrew E Apt Kirk E Bechner Michael Brzezinski Mark A Chaal Balbir K Chiovitti Anthony Davis Aubrey K Demarest Mark S Detter J Chris Glavina Tijana Goodstein David Hadi Masood Z Hellsten Uffe Hildebrand Mark Jenkins Bethany D Jurka Jerzy Kapitonov Vladimir V Kröger Nils Lau Winnie W Y Lane Todd W Larimer Frank W Lippmeier J Casey Lucas Susan Medina Mónica Montsant Anton Obornik Miroslav Parker Micaela Schnitzler Palenik Brian Pazour Gregory J Richardson Paul M Rynearson Tatiana A |
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| Affiliation: | School of Oceanography, University of Washington, Seattle, WA 98195, USA. armbrust@ocean.washington.edu |
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| Abstract: | Diatoms are unicellular algae with plastids acquired by secondary endosymbiosis. They are responsible for approximately 20% of global carbon fixation. We report the 34 million-base pair draft nuclear genome of the marine diatom Thalassiosira pseudonana and its 129 thousand-base pair plastid and 44 thousand-base pair mitochondrial genomes. Sequence and optical restriction mapping revealed 24 diploid nuclear chromosomes. We identified novel genes for silicic acid transport and formation of silica-based cell walls, high-affinity iron uptake, biosynthetic enzymes for several types of polyunsaturated fatty acids, use of a range of nitrogenous compounds, and a complete urea cycle, all attributes that allow diatoms to prosper in aquatic environments. |
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