Relationship of vitamin D receptor gene polymorphisms in Helicobacter pylori gastric patients
Authors Martins DJ, Matos GCB, Loiola RSP, Dâ€™Annibale V, Corvelo T
Received 6 June 2017
Accepted for publication 14 August 2017
Published 12 January 2018 Volume 2018:11 Pages 19—27
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Amy Norman
Peer reviewer comments 3
Editor who approved publication: Professor Andreas M Kaiser
Dinelma de Jesus Martins,1 Gyselly CB Matos,1 Rosane SP Loiola,2 Vivian D’Annibale,3 Tereza Corvelo1
1Immunogenetics Laboratory, Institute of Biological Sciences, Federal University of Pará, 2Central Laboratory Pará State, Executive Office of Health Pará State, 3Epidemiological Surveillance Unit, João de Barros Barreto University Hospital, Belém, Pará, Brazil
Purpose: The present study aimed to investigate the association between the human VDR gene and Helicobacter pylori infection.
Patients and methods: A cross-sectional study was conducted on 208 adult patients with upper gastrointestinal symptoms. Gastric biopsy specimens were obtained from each patient for molecular DNA and histological examination. Patients were genotyped for VDR gene polymorphisms using polymerase chain reaction and restriction fragment length polymorphism analysis.
Results: The allelic and genotypic distribution analyses of the FokI, ApaI and TaqI polymorphisms of the VDR gene did not show distribution differences between H. pylori-positive and -negative groups. The genotype distribution observed for polymorphism BsmI deviated significantly from what was expected in a Hardy–Weinberg equilibrium test in the H. pylori-positive group (X2=29.048, p<0.001). The distribution of BsmI genotypes differed significantly between the H. pylori-negative and H. pylori-positive groups (p=0.0034), where the frequency of the bb genotype increased among H. pylori-positive individuals compared with those without infection (63.25% versus 50.55%, respectively). Conversely, the H. pylori-negative group showed a Bb frequency that was 20.27% higher than in the infected group.
Conclusion: We identified a possible association between the BsmI polymorphism and infection by H. pylori. However, further research is required to clarify this relationship.
Keywords: vitamin D, VDR, polymorphism, Helicobacter pylori virulence factors, infectious disease, VDR SNPs, admixed population
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