[An efficient method for quantification of Helicobacter pylori in biopsy specimen using PCR]

Area of Science:

• Microbiology
• Molecular Biology
• Gastroenterology

Background:

• Helicobacter pylori is a significant pathogen in gastrointestinal disorders.
• Accurate detection and quantification of H. pylori in tissue are crucial for diagnosis and treatment.
• Traditional methods like cultivation have limitations in sensitivity and speed.

Purpose of the Study:

• To develop and validate a sensitive and quantitative polymerase chain reaction (PCR) assay for detecting Helicobacter pylori in gastrointestinal biopsy specimens.
• To establish a DNA quantification standard for H. pylori using PCR.

Main Methods:

• Development of a PCR protocol using 30 cycles with 3.5mM Mg++ for H. pylori DNA detection.
• Quantification of H. pylori DNA per cell.
• Application of the PCR method to analyze gastrointestinal tissue biopsies from patients with various gastrointestinal disorders.

Main Results:

• The PCR method demonstrated high sensitivity and accuracy in quantifying H. pylori.
• The DNA content of a single H. pylori cell was determined to be 0.0076 pg.
• H. pylori was detected in all analyzed biopsy samples, with levels ranging from 0.10 to 60.61 cells per tissue cell.

Conclusions:

• The developed PCR procedure offers a reliable and sensitive method for the detection and quantification of H. pylori in gastrointestinal tissue biopsies.
• This technique eliminates the need for bacterial cultivation, providing a faster and more accurate diagnostic approach.
• The method enables precise measurement of H. pylori load in the context of gastrointestinal diseases.