Primer sensitivity: can it influence the results in Enterococcus faecalis prevalence studies?

Area of Science:

• Endodontics
• Microbiology
• Molecular Biology

Background:

• Enterococcus faecalis is a common cause of persistent endodontic infections.
• Previous PCR studies show variable Enterococcus faecalis prevalence rates.
• Primer sensitivity differences may explain prevalence variability.

Purpose of the Study:

• Compare the sensitivity of three PCR primer sets for Enterococcus faecalis detection.
• Evaluate primers commonly used in endodontic literature.
• Identify the most sensitive primer set for accurate Enterococcus faecalis quantification.

Main Methods:

• Utilized three primer sets: one tuf gene-based (genus-specific) and two 16S rDNA-based (E. faecalis-specific).
• Tested primer sensitivity using Enterococcus faecalis strains at concentrations from 10(2) to 10(8) cells/mL.
• Performed PCR amplification and analyzed results.

Main Results:

• Tuf gene-based primers (Group 1) exhibited significantly higher sensitivity than both 16S rDNA-based primer sets (Groups 2 and 3).
• Group 1 primers consistently outperformed Group 2 and Group 3 primers (P<.0001).
• Indicates differential detection capabilities among primer sets.

Conclusions:

• A tuf-based PCR assay coupled with direct sequencing offers accurate and consistent Enterococcus faecalis prevalence rates.
• Recommends tuf gene-based primers for reliable detection in endodontic infections.
• Highlights the importance of primer selection for accurate microbial diagnostics.