title: B-cell activating factor genetic variants in lymphomagenesis associated with primary Sjogren's syndrome.
abstract: Primary Sjogren's syndrome (pSS) is complicated by B-cell lymphoma in 5-10% of patients. Several clinical and serological features are proposed as adverse predictors for such complication and define a high risk pSS phenotype. We aimed to explore whether previously described polymorphisms of the B-cell activating factor (BAFF) could be related to pSS-related lymphomagenesis. Five single nucleotide polymorphisms (SNPs) of the BAFF gene (rs1224141, rs12583006, rs9514828, rs1041569 and the rs9514827) were evaluated in 111 low risk pSS patients (type II), 82 high risk/lymphoma patients (type I) and 137 healthy controls (HC) by PCR-based assays. The classification of pSS patients into types I and II was based on the presence or absence of risk factors or lymphoma development, respectively. Genotype and haplotype analysis was performed for all variants in the pSS groups. Since the rs1041569 SNP was not in Hardy-Weinberg equilibrium in the HC group (p < 0.001), haplotype analysis was performed in the remaining four out of the five SNPs tested when comparisons with HC individuals were performed. The high risk pSS group was characterized by higher frequency of the minor T allele of the rs9514828 BAFF polymorphism compared to HC. Compared to the low risk pSS patients but not the HC, the high risk pSS group exhibited lower frequencies of the AA genotype of the rs12583006 polymorphism as well as the TACAC and TACC haplotypes and higher frequency of the TTTC haplotype. The low risk pSS group exhibited higher frequency of the minor A allele and AA genotype of the rs12583006 variant compared to HC. Both pSS groups were characterized by increased frequency of the haplotype TATT and GTTC and decreased frequency of the TTCT when compared to HC. Taken together, these findings suggest the implication of the host's genetic background in pSS-related lymphomagenesis. The interaction of pSS-related BAFF gene haplotypes together with distinct BAFF genetic variants appears to contribute to this complication.
authors.affiliation: Department of Physiology, School of Medicine, University of Athens, Athens, Greece.
authors.forename: Adrianos
authors.initials: A
authors.lastname: Nezos
authors.affiliation: Department of Pathophysiology, School of Medicine, University of Athens, Athens, Greece.
authors.forename: Aristea
authors.initials: A
authors.lastname: Papageorgiou
authors.affiliation: Department of Pathophysiology, School of Medicine, University of Athens, Athens, Greece.
authors.forename: George
authors.initials: G
authors.lastname: Fragoulis
authors.affiliation: Department of Rheumatology, General Hospital of Athens "G.Gennimatas", Athens, Greece.
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Ioakeimidis
authors.affiliation: Department of Physiology, School of Medicine, University of Athens, Athens, Greece.
authors.forename: Michael
authors.initials: M
authors.lastname: Koutsilieris
authors.affiliation: Department of Pathophysiology, School of Medicine, University of Athens, Athens, Greece.
authors.forename: Athanasios G
authors.initials: AG
authors.lastname: Tzioufas
authors.affiliation: Department of Pathophysiology, School of Medicine, University of Athens, Athens, Greece.
authors.forename: Haralampos M
authors.initials: HM
authors.lastname: Moutsopoulos
authors.affiliation: Department of Pathophysiology, School of Medicine, University of Athens, Athens, Greece.
authors.forename: Michael
authors.initials: M
authors.lastname: Voulgarelis
authors.affiliation: Department of Physiology, School of Medicine, University of Athens, Athens, Greece. Electronic address: kmauragan@med.uoa.gr.
authors.forename: Clio P
authors.initials: CP
authors.lastname: Mavragani
mesh_terms: D000483:Alleles; D053264:B-Cell Activating Factor / Q000235:genetics*; D016022:Case-Control Studies; D002471:Cell Transformation, Neoplastic / Q000235:genetics*; D005787:Gene Frequency; D023061:Gene Order; D056426:Genetic Loci; D014644:Genetic Variation; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D008223:Lymphoma / Q000175:diagnosis / Q000209:etiology*; D020641:Polymorphism, Single Nucleotide; D012859:Sjogren's Syndrome / Q000150:complications* / Q000175:diagnosis / Q000235:genetics*
chemical_list: D053264:B-Cell Activating Factor
keywords: B-lymphocyte activator factor (BAFF); Genetics; Lymphoma; Primary Sjogren's syndrome (SS); Single nucleotide polymorphisms (SNPs)