Two Tales of Prokaryotic Genomic Diversity: Escherichia coli and Halophiles

Lejla Pašić, Jerneja Ambrožić Avguštin, Marjanca Starčič Erjavec, Blagajana Herzog-Velikonja, Zdravko Podlesek and Darja Žgur-Bertok*

Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana, Slovenia

Article history
Received October 28, 2013
Accepted March 21, 2014

Key words:
Escherichia coli, genomic diversity, virulence, antibiotic resistance, SOS response, bacteriocins, halophiles, metagenomics


Prokaryotes are generally characterized by vast genomic diversity that has been shaped by mutations, horizontal gene transfer, bacteriocins and phage predation. Enormous genetic diversity has developed as a result of stresses imposed in harsh environments and the ability of microorganisms to adapt. Two examples of prokaryotic diversity are presented: on intraspecies level, exemplified by Escherichia coli, and the diversity of the hypersaline environment, with the discussion of food-related health issues and biotechnological potential.

*Corresponding author:


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