Identification of Gram-positive cocci in positive blood cultures by Fluorescence in situ hybridisation (FISH) (CAT#: STEM-MB-1190-WXH)

Introduction

Sepsis is a life-threatening disease with a high mortality rate. Rapid detection of bacteria in the blood is crucial for timely and accurate diagnosis, which contributes significantly to patient outcome. Specifying the pathogen enables the clinician to adjust the empirical antibiotic therapy and to confirm antibiotic treatment according to the antibiotic susceptibility of the isolate, helping to avoid the expansion of antibiotic resistance.

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Principle Applications Procedure Materials Notes Related Products

Principle

FISH uses fluorescent probes with complementary base sequences to locate the presence or absence of specific portions of DNA on chromosomes. The probe and target DNA must be denatured with heat or chemicals to break hydrogen bonds in the DNA and to allow hybridisation to occur once the two samples are mixed. The fluorescent probes form new hydrogen bonds with their complementary base pairs on the DNA, and these can then be detected via microscopy.

Applications

Detect and localize the presence or absence of specific DNA sequences on chromosomes.
Detect and localize specific RNA targets (mRNA, lncRNA and miRNA) in cells, circulating tumor cells, and tissue samples.

Procedure

1. Sample preparation
2. Co-denaturation and hybridization
3. Probe detection
4. Wash off of unbound probe
5. Analysis by flow cytometer/fluorescence microscopy

Materials

• Flow cytometer
• Fluorescence microscopy

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