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The tiny eukaryote Ostreococcus provides genomic insights into the paradox of plankton speciation
Palenik, B.; Grimwood, J.; Aerts, A.; Rouzé, P.; Salamov, A.; Putnam, N.; Dupont, C.; Jorgensen, R.; Derelle, E.; Rombauts, S.; Zhou, K.; Otillar, R.; Merchant, S.S.; Podell, S.; Gaasterland, T.; Napoli, C.; Gendler, K.; Manuell, A.; Tai, V.; Vallon, O.; Piganeau, G.; Jancek, S.; Heijde, M.; Jabbari, K.; Bowler, C.; Lohr, M.; Robbens, S.; Werner, G.; Dubchak, I.; Pazour, G.J.; Ren, Q.; Paulsen, I.; Delwiche, C.; Schmutz, J.; Rokhsar, D.; Van de Peer, Y.; Moreau, H.; Grigoriev, I.V. (2007). The tiny eukaryote Ostreococcus provides genomic insights into the paradox of plankton speciation. Proc. Natl. Acad. Sci. U.S.A. 104(18): 7705-7710.
In: Proceedings of the National Academy of Sciences of the United States of America. The Academy: Washington, D.C.. ISSN 0027-8424; e-ISSN 1091-6490, more
Peer reviewed article  

Available in  Authors 

    Chlorophyta [WoRMS]
Author keywords
    green algae; picoeukaryote; genome evolution; selenium; synteny

Authors  Top 
  • Palenik, B.
  • Grimwood, J.
  • Aerts, A.
  • Rouzé, P., more
  • Salamov, A.
  • Putnam, N.
  • Dupont, C.
  • Jorgensen, R.
  • Derelle, E.
  • Rombauts, S., more
  • Zhou, K.
  • Otillar, R.
  • Merchant, S.S.
  • Podell, S.
  • Gaasterland, T.
  • Napoli, C.
  • Gendler, K.
  • Manuell, A.
  • Tai, V.
  • Vallon, O.
  • Piganeau, G.
  • Jancek, S.
  • Heijde, M.
  • Jabbari, K.
  • Bowler, C.
  • Lohr, M.
  • Robbens, S., more
  • Werner, G.
  • Dubchak, I.
  • Pazour, G.J.
  • Ren, Q.
  • Paulsen, I.
  • Delwiche, C.
  • Schmutz, J.
  • Rokhsar, D.
  • Van de Peer, Y., more
  • Moreau, H.
  • Grigoriev, I.V.

    The smallest known eukaryotes, at ≈1-μm diameter, are Ostreococcus tauri and related species of marine phytoplankton. The genome of Ostreococcus lucimarinus has been completed and compared with that of O. tauri. This comparison reveals surprising differences across orthologous chromosomes in the two species from highly syntenic chromosomes in most cases to chromosomes with almost no similarity. Species divergence in these phytoplankton is occurring through multiple mechanisms acting differently on different chromosomes and likely including acquisition of new genes through horizontal gene transfer. We speculate that this latter process may be involved in altering the cell-surface characteristics of each species. addition, the genome of O. lucimarinus provides insights into the unique metal metabolism of these organisms, which are predicted to have a large number of selenocysteine-containing proteins. Selenoenzymes are more catalytically active than similar enzymes lacking selenium, and thus the cell may require less of that protein. As reported here, selenoenzymes, novel fusion proteins, and loss of some major protein families including ones associated with chromatin are likely important adaptations for achieving a small cell size.

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