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Background   Serratia marcescens  is an opportunistic bacterial pathogen with broad range of host ranging from vertebrates, invertebrates and plants.  S. marcescens  strain W2.3 was isolated from a diseased tilapia fish and it was suspected to be the causal agent for the fish disease as virulence genes were found within its genome. In this study, for the first time, the genome sequences of  S. marcescens  strain W2.3 were sequenced using the Illumina MiSeq platform.    Result  Several virulent factors of  S. marcescens  such as serrawettin, a biosurfactant, has been reported to be regulated by  N -acyl homoserine lactone (AHL)-based quorum sensing (QS). In our previous studies, an unusual AHL with long acyl side chain was detected from this isolate suggesting the possibility of novel virulence factors regulation. This evokes our interest in the genome of this bacterial strain and hereby we present the draft genome of  S. marcescens  W2.3, which carries the serrawettin production gene,  swrA  and the AHL-based QS transcriptional regulator gene,  luxR  which is an orphan  luxR .    Conclusion  With the availability of the whole genome sequences of  S. marcescens  W2.3, this will pave the way for the study of the QS-mediated genes expression in this bacterium.

Insights of biosurfactant producing Serratia marcescens strain W2.3 isolated from diseased tilapia fish: a draft genome analysis