Oligonucleotide probe for detecting Enterobacteriaceae by in situ hybridization

Area of Science:

• Microbiology
• Molecular Biology
• Biotechnology

Background:

• Accurate identification of bacterial species is crucial for public health and safety.
• The Enterobacteriaceae family includes many important human pathogens.
• Developing specific and sensitive detection methods for Enterobacteriaceae is essential.

Purpose of the Study:

• To design and validate a specific oligonucleotide probe for visualizing Enterobacteriaceae.
• To assess the probe's specificity and sensitivity using in situ hybridization.

Main Methods:

• Design of a 24-mer oligonucleotide probe (probe D) based on conserved 16S rDNA sequences within Enterobacteriaceae.
• Comparative sequence analysis against Vibrionaceae and Pasteurellaceae to ensure specificity.
• Testing the fluorescent dye-labeled probe using in situ hybridization and epifluorescence microscopy.

Main Results:

• Probe D targets a highly conserved region in the 16S rDNA of Enterobacteriaceae, distinct from Vibrionaceae and Pasteurellaceae.
• In situ hybridization successfully visualized 76 out of 78 Enterobacteriaceae strains under optimal conditions.
• No cross-reactivity was observed with Vibrionaceae (31 strains) or Gram-positive bacteria (3 strains).

Conclusions:

• In situ hybridization with probe D enables specific and accurate detection of Enterobacteriaceae cells.
• The developed probe and method offer a reliable tool for identifying Enterobacteriaceae.
• This technique has significant potential for routine monitoring of Enterobacteriaceae in food and water samples.