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Objectives  The  eps  locus in  Vibrio diabolicus  is involved in the production of the biotechnologically valuable HE800 EPS. In this study, the distribution and diversity of similar  eps  gene clusters across Vibrionaceae and its variability in relation to phylogenetic relationship were investigated. The aim was to provide a better knowledge of the  eps  gene cluster importance and to facilitate discovery of new EPS with potent interesting bioactivities.    Results  Seventy percent of the 103 genome sequences examined display such an  eps  locus with a high level of synteny. However, genetic divergence was found inside some monophyletic clades or even between some strains of the same species. It includes gene insertions, truncations, and deletions. Comparative analysis also reveals some variations in glycosyltransferase and export systems genes. Phylogenetic analysis of the Vibrionaceae  eps  gene clusters within Vibrionaceae suggests a vertical transfer by speciation but also pinpoints rearrangement events independent of the speciation.    Electronic supplementary material  The online version of this article (10.1186/s13104-018-3214-z) contains supplementary material, which is available to authorized users.

Comparative genomics reveals a widespread distribution of an exopolysaccharide biosynthesis gene cluster among Vibrionaceae