title: Association of IL1B -511C/-31T haplotype and Helicobacter pylori vacA genotypes with gastric ulcer and chronic gastritis.
abstract: BACKGROUND
  The association between proinflammatory cytokine gene polymorphisms and gastric diseases related to Helicobacter pylori varies by population and geographic area.Our objective was to determine if the IL-1B -511 T>C and -31 C>T polymorphisms and H. pylori vacA genotypes are associated with risk of chronic gastritis and gastric ulcer in a Mexican population.
  
  
  METHODS
  We conducted endoscopic studies in 128 patients with symptoms of dyspepsia. We took two biopsies from the body, antrum, or ulcer edge from each patient, and classified our histopathological findings according to the Sydney System. H. pylori infection and vacA genotyping were accomplished via PCR from total DNA of the gastric biopsies. We confirmed the presence of anti-H. pylori serum IgG and IgM in 102 control subjects. In both case subjects and control subjects, the IL-1B -511 T>C polymorphism was genotyped by PCR-RFLPs and the IL-1B -31 C>T polymorphism was genotyped by pyrosequencing.
  
  
  RESULTS
  Sixty-two point seven (62.7%) of the 102 control subjects were H. pylori-seropositive. Among the case subjects, 100 were diagnosed with chronic gastritis and 28 with gastric ulcer. We found that 77% of the patients with chronic gastritis and 85.7% of the patients with gastric ulcer were H. pylori-positive. The predominant H. pylori genotype was vacA s1m1 (58.4%) and the most frequent subtype was vacA s1. The -511 TC, (rs16944 -511 T>C) genotype and the -511C allele were associated with chronic gastritis (OR = 3.1, 95% CI = 1.4-6.8 and OR = 3.0, 95% CI = 1.4-6.0, respectively). The subjects carrying -31T (rs1143627 -31 C>T) were found to be at a higher risk of having chronic gastritis (OR = 2.8, 95% CI = 1.3-5.8). The IL-1B -511C/-31T haplotype was associated with chronic gastritis (OR = 2.1, 95% CI = 1.2-3.8) but not with gastric ulcer.
  
  
  CONCLUSIONS
  The H. pylori vacA genotypes identified herein were similar to those reported for other regions of Mexico. The vacA s1m1 genotype was not associated with gastric ulcer. In the southern Mexican population, the IL-1B -511C and -31T alleles and the -511C/-31T and -511T/-31T haplotypes are associated with increased risk of chronic gastritis and gastric ulcer.
authors.affiliation: Laboratorio de Investigación Clínica, Unidad Académica de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Av, Lázaro Cárdenas S/N, Ciudad Universitaria, Colonia Haciendita, Chilpancingo, Guerrero, C,P, 39090, México.
authors.forename: Dinorah N
authors.initials: DN
authors.lastname: Martínez-Carrillo
authors.forename: Elvira
authors.initials: E
authors.lastname: Garza-González
authors.forename: Reyes
authors.initials: R
authors.lastname: Betancourt-Linares
authors.forename: Trinidad
authors.initials: T
authors.lastname: Mónico-Manzano
authors.forename: Cuauhtémoc
authors.initials: C
authors.lastname: Antúnez-Rivera
authors.forename: Adolfo
authors.initials: A
authors.lastname: Román-Román
authors.forename: Eugenia
authors.initials: E
authors.lastname: Flores-Alfaro
authors.forename: Berenice
authors.initials: B
authors.lastname: Illades-Aguiar
authors.forename: Gloria
authors.initials: G
authors.lastname: Fernández-Tilapa
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D001706:Biopsy; D002908:Chronic Disease; D004247:DNA / Q000235:genetics*; D004269:DNA, Bacterial / Q000235:genetics / Q000302:isolation & purification; D005260:Female; D005756:Gastritis / Q000453:epidemiology / Q000235:genetics* / Q000378:metabolism; D006239:Haplotypes; D016481:Helicobacter Infections / Q000453:epidemiology / Q000235:genetics / Q000382:microbiology; D016480:Helicobacter pylori / Q000235:genetics*; D006801:Humans; D015994:Incidence; D053583:Interleukin-1beta / Q000235:genetics* / Q000378:metabolism; D008297:Male; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012189:Retrospective Studies; D013276:Stomach Ulcer / Q000453:epidemiology / Q000235:genetics* / Q000378:metabolism; D055815:Young Adult
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; C508585:IL1B protein, human; D053583:Interleukin-1beta; C074689:VacA protein, Helicobacter pylori; D004247:DNA