International Journal of
Genetics and Molecular Biology

  • Abbreviation: Int. J. Genet. Mol. Biol.
  • Language: English
  • ISSN: 2006-9863
  • DOI: 10.5897/IJGMB
  • Start Year: 2009
  • Published Articles: 111

Full Length Research Paper

Biodiversity of uncultured bacteria in hypersaline lakes, Siwa oasis, Egypt, as determined by polymerase chain reaction and denaturing gradient gel electrophoresis (PCR-DGGE) of 16S rRNA gene phylotypes

Hosam E. Elsaied*
  • Hosam E. Elsaied*
  • Genetics and Genetic engineering research group, National Institute of Oceanography and Fisheries, NIOF, Cairo, Egypt.
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Mohamad Saad Abd El-Karim
  • Mohamad Saad Abd El-Karim
  • Phycology research group, National Institute of Oceanography and Fisheries, NIOF, Cairo, Egypt.
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Mai A. Wassel
  • Mai A. Wassel
  • Genetics and Genetic engineering research group, National Institute of Oceanography and Fisheries, NIOF, Cairo, Egypt.
  • Google Scholar


  •  Received: 01 August 2016
  •  Accepted: 12 October 2016
  •  Published: 30 April 2017

Abstract

Bacterial populations within hypersaline lakes often exhibit uncultured unique species. Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE), followed by sequencing of 16S rRNA gene approach was applied in order to explore, for the first time, the bacterial communities within the hypersaline Lakes, Aghormy, Zeiton and Maraqi, Siwa Oasis, Egypt. The DGGE profile displayed 12 phylotypes of 16S rRNA gene, representing the total species richness within the three studied lakes. The phylotypes were varied among lakes, but were restricted to two phylogenetic groups, Bacteroidetes, which occurred in all lakes, and Alphaproteobacetria, which showed abundance in only Lakes Zeiton and Maraqi. Single spirochete-like phylotype characterized the Lake Aghormy. A phylotype, which was recorded in both of Aghormy and Zeiton, represented a first recorded of Lewinella agarilytica in hypersaline inland lakes. Sequence homology results suggested novel indigenous bacterial phylotypes.

Key words: Siwa lakes, halophilic bacteria, 16S rRNA gene, molecular diversity.