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Genotypic characterization of Lactic acid bacteria in gut microbiome of freshwater fish

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Abstract

The present study focused on identification and genotypic characterization of Lactic acid bacteria (LAB) in the intestine of freshwater fish. 76 strains of LAB were isolated and identified by 16S rRNA gene sequences and hsp60 gene sequences as different strains of Lactobacillus plantarum, Lactobacillus pentosus, Lactobacillus fermentum, Lactobacillus delbrueckii subsp. bulgaricus, Lactobacillus brevis, Lactobacillus reuteri, Lactobacillus salivarius, Pediococcus pentosaceus, Pediococcus acidilactici, Weissella paramesenteroides, Weissella cibaria, Enterococcus faecium, and Enterococcus durans. The hsp60 gene showed a higher level of sequence variation among the isolates examined, with lower interspecies sequence similarity providing more resolutions at the species level than the 16S rRNA gene. Phylogenetic tree derived from hsp60 gene sequences with higher bootstrap values at the nodal branches was more consistent as compared to phylogenetic tree constructed from 16S rRNA gene sequences. Closely related species L. plantarum and L. pentosus as well as species L. delbrueckii subsp. bulgaricus and L. fermentum were segregated in different cluster in hsp60 phylogenetic tree whereas such a distribution was not apparent in 16S rRNA phylogenetic tree. In silico restriction analysis revealed a high level of polymorphism within hsp60 gene sequences. Restriction pattern with enzymes AgsI and MseI in hsp60 gene sequences allowed differentiation of all the species including closely related species L. plantarum and L. pentosus, E. faecium and E. durans. In general, hsp60 gene with higher evolutionary divergence proved to be a better phylogenetic marker for the group LAB.

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  1. Division of Fish Health Management, Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar, 751002, Odisha, India

    U. J. Maji & S. Mohanty

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  1. U. J. Maji
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  2. S. Mohanty
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Correspondence to U. J. Maji.

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Maji, U.J., Mohanty, S. Genotypic characterization of Lactic acid bacteria in gut microbiome of freshwater fish. Microbiology 86, 276–285 (2017). https://doi.org/10.1134/S0026261717020138

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