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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo International Journal of Systematic and Evolutionary Microbiology

Volume 74, Issue 6

Proposal for reclassification of the species as nom. nov. and transfer of the genus to the family No Access

Abstract

X5-1 is an anaerobic, xylan-fermenting bacterium first isolated from methane-producing cattle manure. Initially identified as , this species was later reclassified as in 2019. Although this reclassification found support through Genome Distance Phylogeny analysis which placed X5-1 into the same clade as DSM 24995, it was contradicted by 16S rRNA gene phylogenetic analysis, which associated it with a set of misnamed species later reassigned into the genus . To ascertain its taxonomic position, comparative analyses were performed to re-examine the relationship between X5-1 and all species of the genera and . The ranges of 16S rRNA gene sequence similarity, average amino acid identity, and percentage of conserved protein prediction values were higher between X5-1 and species of the genus than . In addition, X5-1 was found to harbour genes and pathways conserved and exclusive to species within the genus but not . Essentially, in both the 16S rRNA gene phylogenetic tree and the core-genome phylogenomic tree, X5-1 clustered into the same clade as species of the genus , distinct from species of the genus . It is thus clear that X5-1 represents a species within the genus , which we propose to reclassify as nom. nov. Finally, based on the results from the phylogenetic and comparative analyses, the genus was transferred to the family .

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): Clostridiaceae , Hungatella , Hungatella xylanolytica , Lachnospiraceae , Lacrimispora , Lacrimispora xylanisolvens nom. nov. and reclassification
© 2024 Not applicable
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2024-06-13
2025-06-24
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/content/journal/ijsem/10.1099/ijsem.0.006417
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Proposal for reclassification of the species Hungatella xylanolytica as Lacrimispora xylanisolvens nom. nov. and transfer of the genus Hungatella to the family Lachnospiraceae
Int J Syst Evol Microbiol 74, 006417 (2024); https://doi.org/10.1099/ijsem.0.006417
/content/journal/ijsem/10.1099/ijsem.0.006417
/content/journal/ijsem/10.1099/ijsem.0.006417
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