Genome-based reclassification of Lactobacillus casei: emended classification and description of the species Lactobacillus zeae.

Abstract:

:Taxonomic relationships between Lactobacillus casei, Lactobacillus paracasei and Lactobacillus zeae have long been debated. Results of previous analyses have shown that overall genome relatedness indices (such as average nucleotide identity and core nucleotide identity) between the type strains L. casei ATCC 393T and L. zeae ATCC 15820T were 94.6 and 95.3 %, respectively, which are borderline for species definition. However, the digital DNA‒DNA hybridization value was 57.3 %, which was clearly lower than the species delineation threshold of 70 %, and hence raised the possibility that L. casei could be reclassified into two species. To re-evaluate the taxonomic relationship of these taxa, multilocus sequence analysis (MLSA) based on the concatenated five housekeeping gene (dnaJ, dnaK, mutL, pheS and yycH) sequences, phylogenomic and core genome multilocus sequence typing analyses, gene presence and absence profiles using pan-genome analysis, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) profiling analysis, cellular fatty acid compositions, and phenotype analysis were carried out. The results of phenotypic characterization, MLSA, whole-genome sequence-based analyses and MALDI-TOF MS profiling justified an independent species designation for the L. zeae strains, and supported an emended the description of the name of Lactobacillus zeae (ex Kuznetsov 1956) Dicks et al. 1996, with ATCC 15820T (=DSM 20178T=BCRC 17942T) as the type strain.

authors

Huang CH,Chen CC,Liou JS,Lee AY,Blom J,Lin YC,Huang L,Watanabe K

doi

10.1099/ijsem.0.003969

subject

Has Abstract

pub_date

2020-06-01 00:00:00

pages

3755-3762

issue

6

eissn

1466-5026

issn

1466-5034

journal_volume

70

pub_type

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