title: Phylogenetic relationship of Salmonella enterica strains in Tehran, Iran, using 16S rRNA and gyrB gene sequences.
abstract: BACKGROUND
  We assessed whether 16S rDNA and gyrB gene sequences, alone or combined, were suitable for determining the phylogenetic relationship among Salmonella enterica strains isolated from Tehran, Iran. Patients over five years of age enrolled in an acute diarrheal surveillance project in Tehran province between May 2004 and October 2006 were selected as our study group.
  
  
  METHODS
  16S ribosomal DNA (rDNA) and gyrB genes from 40 Salmonella isolates obtained from patients with acute diarrhea were sequenced and the data was used to generate phylogenetic trees that facilitated isolate comparison.
  
  
  RESULTS
  Salmonella strains clustered into five to seven phylogenetic groups, dependent on analysis of 16S rDNA (1546 bp), gyrB (1256 bp) or a combination of the two genes. By 16S rDNA sequence analysis, only strains of Salmonella enterica serovar Typhi ( S. Typhi) clustered exclusively together. gyrB sequences permitted clustering of all the S. Typhi and S. Paratyphi A isolates, and clustering of S. Enteritidis into two separate but exclusive groups. Concatenation of the two data sets did not significantly improve the resolution of the strains compared to the gyrB gene. None of the analyses completely resolved S. enterica Paratyphi B and C into mutually exclusive groups.
  
  
  CONCLUSIONS
  Sequencing of gyrB represents a potentially useful tool for determining the phylogenetic relationship of S. enterica strains in Tehran, Iran. Genetic analysis of the 16S rRNA gene alone or in combination with gyrB did not increase the resolution between serotypes of S. enterica. We speculate that inclusion of additional genetic markers would improve the sensitivity of the analysis.
authors: Research Center for Gastroenterology and Liver Disease, Shahid Beheshti University, Medical Science, Tehran, Iran. mercedeht25@yahoo.com
authors: Mercedeh
authors: M
authors: Tajbakhsh
authors: Babak Noory
authors: BN
authors: Nayer
authors: Kamyar
authors: K
authors: Motavaze
authors: Pedram
authors: P
authors: Kharaziha
authors: Mohsen
authors: M
authors: Chiani
authors: Mohammad Reza
authors: MR
authors: Zali
authors: John David
authors: JD
authors: Klena
mesh_terms: D000293:Adolescent; D000328:Adult; D016000:Cluster Analysis; D027081:DNA Gyrase / Q000235:genetics; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D003967:Diarrhea / Q000453:epidemiology* / Q000382:microbiology; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008875:Middle Aged; D017720:Molecular Epidemiology / Q000379:methods; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012480:Salmonella Infections / Q000453:epidemiology* / Q000382:microbiology*; D019779:Salmonella enterica / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D017422:Sequence Analysis, DNA; D017385:Sequence Homology; D055815:Young Adult
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D027081:DNA Gyrase