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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo

Volume 61, Issue 12

A multilocus sequence analysis approach to the phylogeny and taxonomy of the Free

Abstract

Members of the order are obligate extreme halophiles that belong to the domain . The classification of the currently relies on a polyphasic approach, which integrates phenotypic, genotypic and chemotaxonomic characterization. However, the most utilized genetic marker for phylogeny, the 16S rRNA gene, has multiple drawbacks for use with the : the species of many genera exhibit large intragenic differences between multiple ribosomal RNA operons, the gene is too conserved to discriminate reliably at the species level and it appears to be the most frequently recombined gene between closely related species. Moreover, the is a rapidly expanding group due to recent successes at cultivating novel strains from a diverse set of hypersaline environments; a fast, reliable, inexpensive, portable molecular method for discriminating species is required for their investigation. Recently, multilocus sequence analysis (MLSA) has been shown to be an effective tool for strain identification and taxonomic designation, even for those taxa that experience frequent lateral gene transfer and homologous recombination. In this study, MLSA was utilized for evolutionary and taxonomic investigation of the . Efficacy of the MLSA approach was tested across a hierarchical gradient using 52 halobacterial strains, representing 33 species (including names without standing in nomenclature) and 14 genera. A subset of 21 strains from the genus was analysed separately to test the sensitivity and relevance of the MLSA approach among closely related strains and species. The results demonstrated that MLSA differentiated individual strains, reliably grouped strains into species and species into genera and identified potential novel species and also family-like relationships. This study demonstrates that MLSA is a rapid and informative molecular method that will probably accommodate strain analysis at any taxonomic level within the .

  • Published Online:
Funding
This study was supported by the:
  • National Science Foundation (Award 0830024 and 0919290)
  • US–Israel Binational Science Foundation (Award 2007043)
  • Spanish Ministry of Education and Science (Award BIO2009-10138)
  • Junta de Andalucia (Award P06-CVI-01829)
© 2011 IUMS
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2011-12-01
2024-04-18
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A multilocus sequence analysis approach to the phylogeny and taxonomy of the Halobacteriales
Int J Syst Evol Microbiol 61, 2984 (2011); https://doi.org/10.1099/ijs.0.029298-0
/content/journal/ijsem/10.1099/ijs.0.029298-0
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