Diversification of two lineages of symbiotic photobacterium

Henryk Urbanczyk, Yoshiko Urbanczyk, Tetsuya Hayashi, Yoshitoshi Ogura

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Understanding of processes driving bacterial speciation requires examination of closely related, recently diversified lineages. To gain an insight into diversification of bacteria, we conducted comparative genomic analysis of two lineages of bioluminescent symbionts, Photobacterium leiognathi and 'P. mandapamensis'. The two lineages are evolutionary and ecologically closely related. Based on the methods used in bacterial taxonomy for classification of new species (DNA-DNA hybridization and ANI), genetic relatedness of the two lineages is at a cut-off point for species delineation. In this study, we obtained the whole genome sequence of a representative P. leiognathi strain lrivu.4.1, and compared it to the whole genome sequence of 'P. mandapamensis' svers.1.1. Results of the comparative genomic analysis suggest that P. leiognathi has a more plastic genome and acquired genes horizontally more frequently than 'P. mandapamensis'. We predict that different rates of recombination and gene acquisition contributed to diversification of the two lineages. Analysis of lineage-specific sequences in 25 strains of P. leiognathi and 'P. mandapamensis' found no evidence that bioluminescent symbioses with specific host animals have played a role in diversification of the two lineages.

Original languageEnglish
Article numbere82917
JournalPloS one
Issue number12
Publication statusPublished - Dec 13 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Biochemistry,Genetics and Molecular Biology
  • General Agricultural and Biological Sciences
  • General


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