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Genome-Based Reclassification of Strain KIST612, Previously Classified as Eubacterium limosum, into a New Strain of Eubacterium callanderi

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Abstract
The strain KIST612, initially identified as E. limosum, was a suspected member of E. callanderi due to differences in phenotype, genotype, and average nucleotide identity (ANI). Here, we found that E. limosum ATCC 8486T and KIST612 are genetically different in their central metabolic pathways, such as that of carbon metabolism. Although 16S rDNA sequencing of KIST612 revealed high identity with E. limosum ATCC 8486T (99.2%) and E. callanderi DSM 3662T (99.8%), phylogenetic analysis of housekeeping genes and genome metrics clearly indicated that KIST612 belongs to E. callanderi. The phylogenies showed that KIST612 is closer to E. callanderi DSM 3662T than to E. limosum ATCC 8486T. The ANI between KIST612 and E. callanderi DSM 3662T was 99.8%, which was above the species cutoff of 96%, Meanwhile, the ANI value with E. limosum ATCC 8486T was not significant, showing only 94.6%. The digital DNA-DNA hybridization (dDDH) results also supported the ANI values. The dDDH between KIST612 and E. callanderi DSM 3662T was 98.4%, whereas between KIST612 and E. limosum ATCC 8486T, it was 57.8%, which is lower than the species cut-off of 70%. Based on these findings, we propose the reclassification of E. limosum KIST612 as E. callanderi KIST612. Copyright 2023 by the authors.
Author(s)
Kim, Ji-YeonKang, ByeongchanOh, SoyoungGil, YejiChoi, In-GeolChang, In Seop
Issued Date
2023-08
Type
Article
DOI
10.4014/jmb.2304.04011
URI
https://scholar.gist.ac.kr/handle/local/10040
Publisher
Korean Society for Microbiolog and Biotechnology
Citation
Journal of Microbiology and Biotechnology, v.33, no.8, pp.1084 - 1090
ISSN
1017-7825
Appears in Collections:
Department of Environment and Energy Engineering > 1. Journal Articles
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