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lüll Review article: Deoxyribonucleic acid-based diagnostic techniques to detect Helicobacter pylori Ruzsovics A; Molnar B; Tulassay ZAliment Pharmacol Ther 2004[Jun]; 19 (11): 1137-46Helicobacter pylori is an important cause of many gastrointestinal disorders, ranging from chronic gastritis to gastric lymphoma and adenocarcinoma. The deoxyribonucleic acid-based assays have the potential to be a powerful diagnostic tool given its ability to specifically identify H. pylori deoxyribonucleic acid. Markers used to include general H. pylori structures and pathogenetic factors like ureaseA, cagA, vacA, iceA. Deoxyribonucleic acid or bacterial ribonucleic acid for polymerase chain reaction assays can be collected from gastric biopsy, gastric juice, stool, buccal specimens. Polymerase chain reaction can yield quantitative and genotyping results with sensitivity and specificity that approaches 100%. A clear trend in the direction of the determination of quantitative H. pylori infection by real-time polymerase chain reaction can be observed. Fluorescent in situ hybridization is suggested for routine antibiotic resistance determination. To identify the organism, deoxyribonucleic acid structure and its virulence factors may be feasible by using oligonucleotide microarray specifically recognizing and discriminating bacterial deoxyribonucleic acid and various virulence factors. Deoxyribonucleic acid-based H. pylori diagnosis yields higher sensitivity, however, specificity requires sophisticated labour environment and associated with higher costs.|Biomarkers/analysis[MESH]|DNA, Bacterial/*isolation & purification[MESH]|Drug Resistance, Bacterial[MESH]|Genetic Markers[MESH]|Helicobacter Infections/*diagnosis[MESH]|Helicobacter pylori/*isolation & purification[MESH]|Humans[MESH]|In Situ Hybridization, Fluorescence/methods[MESH]|Oligonucleotide Array Sequence Analysis[MESH]|Polymerase Chain Reaction/methods[MESH]|Polymorphism, Restriction Fragment Length[MESH] |