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Study of Maternal origin of inflammatory leukocytes in preterm fetal membranes by Fluorescence in situ hybridisation (FISH) (CAT#: STEM-MB-1227-WXH)

Introduction

Chorioamnionitis is a histological diagnosis based upon the infiltration of inflammatory leukocytes into the fetal membranes. It is associated with a maternal inflammatory reaction, often with fever and increased C-reactive protein (CRP) levels.
In chorioamnionitis, leukocyte infiltration is often considered to be maternal, although no studies have demonstrated this definitively. However, a fetal origin for leukocytes in amniotic fluid has been identified and such cells could possibly access the amnion or chorion of the fetal membranes.




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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