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GENOMIC TAXONOMY OF THE GENUS PROCHLOROCOCCUS
Autor
Afiliación
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microorganismos. Rio de Janeiro, RJ, Brasil.
San Diego State University. Department of Computer Science and Computational Science Research Center. San Diego, CA, USA.
Universidade Federal do Rio de Janeiro. Instituto de Biologia. Laboratório de Microbiologia. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Biologia. Laboratório de Microbiologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microorganismos. Rio de Janeiro, RJ, Brasil.
San Diego State University. Department of Computer Science and Computational Science Research Center. San Diego, CA, USA.
Universidade Federal do Rio de Janeiro. Instituto de Biologia. Laboratório de Microbiologia. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Biologia. Laboratório de Microbiologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microorganismos. Rio de Janeiro, RJ, Brasil.
Resumen en ingles
The genus Prochlorococcus is globally abundant
and dominates the total phytoplankton biomass and production
in the oligotrophic ocean. The single species, Prochlorococcus
marinus, comprises six named ecotypes. Our aim was to
analyze the taxonomic structure of the genus Prochlorococcus.
We analyzed the complete genomes of 13 cultured P. marinus
type and reference strains by means of several genomic taxonomy
tools (i.e., multilocus sequence analysis, amino acid identity,
Karlin genomic signature, and genome to genome distance).
In addition, we estimated the diversity of Prochlo
rococcus species in over 100 marine metagenomes from all
the major oceanic provinces. According to our careful taxonomic
analysis, the 13 strains corresponded, in fact, to ten
different Prochlorococcus species. This analysis establishes a
new taxonomic framework for the genus Prochlorococcus.
Further, the analysis of the metagenomic data suggests that,
in total, there may only be 35 Prochlorococcus species in the
world's oceans. We propose that the dearth of species observed
in this study is driven by high selective pressures that
limit diversification in the global ocean.
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