PCR Based Detection of Phase Variable Genes in Pakistani Based Clinical Helicobacter pylori Strains

Author, as appears in the article.: Ahmad, Hajra; Khan, Imad; Khan, Fida Muhammad; Rahman, Amjad Ur; Mughal, Imran; Murad, Waheed; Khan, Salman; Rahman, Faiz Ur; Ahmad, Faisal; Ahmad, Sajjad

Department: Ciències Mèdiques Bàsiques

URV's Author/s: UR, FAIZ

Keywords: Sequence; Restriction modification system; Phase-variable genes; Pcr; Infection; Helicobacter pylori; Genome; Diversity; Adaptation; phase-variable genes; pcr; helicobacter pylori

Abstract: Background: The distribution pattern of phase-variable genes varies from strain to strain and from region to region. The present study was carried out to investigate the distribution pattern of phase-variable genes within Pakistan-based Helicobacter pylori strains and to analyze and compare them with strains prevalent in other parts of the world. Objectives: To determine the distribution pattern of phase-variable genes in H. pylori strains circulating in Pakistan. Patients and Methods: Biopsy samples were collected from 85 symptomatic patients suffering from various upper gastrointestinal tract symptoms. The biopsy specimens were chopped, then inoculated on H. pylori-specific media and incubated in a Campylobacter Gas Generating kit. Positive isolates were further confirmed via staining and biochemical procedures. Primers were designed for five phase-variable genes using OligoCalc, an oligonucleotide properties calculator (version 3.26) according to parameters stipulated in the literature. Polymerase chain reaction (PCR) was performed on all positive isolates to determine the presence or absence of phase-variable genes. Results: On culturing, the prevalence of H. pylori infections in the samples was 44.7%. The prevalence was higher in females than in males, and it increased with age. PCR amplification revealed that the hsdR gene was present in 79% of samples, while the mod and beta-subunit genes were present in 16% and 30% of samples, respectively. The streptococcal M protein gene was found in 79%, while the fliP gene was prevalent in 56%. Conclusions: The distribution patterns of phase-variable genes in Pakistani H. pylori strains were found to be somewhat different. The dominant prevalence of the hsdR gene was an interesting finding, considering its role in bacterial defense in both micro- and macroenvironments.

Thematic Areas: Microbiology (medical); Microbiology; Infectious diseases

licence for use: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 20083645

Author's mail: faiz.urrahman@irta.cat

Record's date: 2021-04-17

Paper version: info:eu-repo/semantics/publishedVersion

Link to the original source: https://sites.kowsarpub.com/jjm/articles/60097.html

Paper original source: Jundishapur Journal Of Microbiology. 9 (7): e31824-

APA: Ahmad, Sajjad; Ahmad, Faisal; Rahman, Faiz Ur; Khan, Salman; Murad, Waheed; Mughal, Imran; Rahman, Amjad Ur; Khan, Fida Muhammad; Khan, Imad; Ahmad, H (2016). PCR Based Detection of Phase Variable Genes in Pakistani Based Clinical Helicobacter pylori Strains. Jundishapur Journal Of Microbiology, 9(7), e31824-. DOI: 10.5812/jjm.31824

Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/

Article's DOI: 10.5812/jjm.31824

Entity: Universitat Rovira i Virgili

Journal publication year: 2016

Publication Type: Journal Publications