A new real time PCR (TaqMan PCR) system for detection of the16S rDNA gene associated with fecal bacteria.
A recent PCR detection technique (TaqMan) based on a 3'-Minor Groove Binder (MGB) probe was applied to the detection of fecal-dominant bacteria to assess fecal contamination in environmental samples. Primers and probes used bacterial 16S ribosomal DNA (16S rDNA) as a gene marker and accurately defined with specificity a cluster of phylotypes within the Gram-positive low GC division. This cluster of phylotypes, called Fec1, corresponds to around 5% of human fecal microflora. Fec1 clustered 16S rDNA and strains (Eubacterium rectale) of fecal origin. A range of samples made up of feces and intestinal samples from humans and animals tested positive whereas other microbial ecosystems (soils, laboratory reactor, subsurface water) were negative. In order to circumvent problems related to DNA extraction efficiency, quantitative results took the form of the ratio between Fec1 16S rDNA and total bacterial 16S rDNA. The threshold of detection, defined as the ratio between Fec1 and total 16S rDNA, was measured as 0.006%.
Laboratoire de Biotechnologies de l'Environnement, Institut National de la Recherche Agronomique, Avenue des Etangs, 11100 Narbonne, France.
Nicolas
N
Rousselon
Jean-Philippe
JP
Delgenès
Jean-Jacques
JJ
Godon
D000818:Animals; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004784:Environmental Monitoring / Q000379:methods; D005243:Feces / Q000382:microbiology*; D006094:Gram-Positive Bacteria / Q000235:genetics* / Q000302:isolation & purification; D006801:Humans; D016133:Polymerase Chain Reaction / Q000379:methods*; D012336:RNA, Ribosomal, 16S / Q000032:analysis* / Q000737:chemistry / Q000235:genetics; D012722:Sewage; D019914:Taq Polymerase / Q000737:chemistry; D014871:Water Microbiology
D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S; D012722:Sewage; D019914:Taq Polymerase