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The genome of the diatom Thalassiosira pseudonana: ecology, evolution, and metabolism.

Science (New York, N.Y.) | Oct 1, 2004

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.

Pubmed ID: 15459382 RIS Download

Mesh terms: Adaptation, Physiological | Algal Proteins | Animals | Biological Evolution | Cell Nucleus | Chromosomes | DNA | Diatoms | Ecosystem | Energy Metabolism | Genome | Iron | Light | Light-Harvesting Protein Complexes | Mitochondria | Molecular Sequence Data | Nitrogen | Photosynthesis | Plastids | Restriction Mapping | Sequence Alignment | Sequence Analysis, DNA | Silicic Acid | Symbiosis | Urea