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pubmed-article:19855009pubmed:abstractTextDNA-DNA hybridization (DDH) has been used for nearly 50 years as the gold standard for prokaryotic species circumscriptions at the genomic level. It has been the only taxonomic method that offered a numerical and relatively stable species boundary, and its use has had a paramount influence on how the current classification has been constructed. However, now, in the era of genomics, DDH appears to be an outdated method for classification that needs to be substituted. The average nucleotide identity (ANI) between two genomes seems the most promising method since it mirrors DDH closely. Here we examine the work package JSpecies as a user-friendly, biologist-oriented interface to calculate ANI and the correlation of the tetranucleotide signatures between pairwise genomic comparisons. The results agreed with the use of ANI to substitute DDH, with a narrowed boundary that could be set at approximately 95-96%. In addition, the JSpecies package implemented the tetranucleotide signature correlation index, an alignment-free parameter that generally correlates with ANI and that can be of help in deciding when a given pair of organisms should be classified in the same species. Moreover, for taxonomic purposes, the analyses can be produced by simply randomly sequencing at least 20% of the genome of the query strains rather than obtaining their full sequence.lld:pubmed
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pubmed-article:19855009pubmed:issn1091-6490lld:pubmed
pubmed-article:19855009pubmed:authorpubmed-author:RichterMichae...lld:pubmed
pubmed-article:19855009pubmed:authorpubmed-author:Rosselló-Móra...lld:pubmed
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pubmed-article:19855009pubmed:pagination19126-31lld:pubmed
pubmed-article:19855009pubmed:dateRevised2010-9-27lld:pubmed
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pubmed-article:19855009pubmed:year2009lld:pubmed
pubmed-article:19855009pubmed:articleTitleShifting the genomic gold standard for the prokaryotic species definition.lld:pubmed
pubmed-article:19855009pubmed:affiliationMarine Microbiology Group, Institut Mediterrani d'Estudis Avançats (CSIC-UIB), E-07190 Esporles, Spain.lld:pubmed
pubmed-article:19855009pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19855009pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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