11
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Otimização de metodologia PCR-SSP para identificação de polimorfismos genéticos de TNF e IL2 Translated title: Optimization of the PCR-SSP methodology in the identification of TNF and IL2 genetic polymorphisms

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          A análise de polimorfismos únicos de nucleotídeos (SNPs) de citocinas pode ser útil em estudos de frequências alélicas e genotípicas em populações saudáveis de diversas regiões, em estudos de associação com doenças infecciosas ou autoimunes, em estudos antropológicos e na evolução pós-transplante. Estes SNPs podem ser avaliados por diferentes métodos moleculares. O objetivo deste estudo foi aperfeiçoar uma metodologia PCR-SSP simples e rápida para a genotipagem de três SNPs de citocinas usando um único teste laboratorial. Para a identificação de IL2-330T/G e IL2+166G/T foram utilizados dois procedimentos na mesma genotipagem, cada um baseado no uso de quatro iniciadores. Para a detecção de TNF-238G/A foram utilizados dois iniciadores que amplificam a guanina e adenina na posição -238. Este estudo permitiu aperfeiçoar um método simples e rápido para identificar três SNPs de citocinas num único teste, podendo ser utilizado em qualquer laboratório de biologia molecular, como alternativa ao uso de kits de alto custo.

          Translated abstract

          The analysis of cytokine single nucleotide polymorphisms (SNPs) can be useful in studies of allelic and genotypic frequencies in healthy populations from different regions of Brazil, in association studies of infectious or auto-immune diseases, in anthropological studies and in studies on post-transplant evolution. These SNPs can be assessed by different molecular methods. The objective of this study was to improve a simple and fast methodology, PCR-SSP, for the genotyping of three cytokine SNPs using a single laboratorial test. To identify IL2-330T/G and IL2+166G/T, two procedures were used in the same genotyping assay, each one based on the use of 4 primers. To detect TNF-238G/A, two primers were used that amplify guanine and adenine at position -238. This study enabled the improvement of a simple and fast method for identifying three cytokine SNPs in a single test, which can be adopted in any Molecular Biology laboratory as an alternative to the use of expensive kits.

          Related collections

          Most cited references36

          • Record: found
          • Abstract: found
          • Article: not found

          Effects of a polymorphism in the human tumor necrosis factor alpha promoter on transcriptional activation.

          Tumor necrosis factor alpha (TNF alpha) is a potent immunomodulator and proinflammatory cytokine that has been implicated in the pathogenesis of autoimmune and infectious diseases. For example, plasma levels of TNF alpha are positively correlated with severity and mortality in malaria and leishmaniasis. We have previously described a polymorphism at -308 in the TNF alpha promoter and shown that the rare allele, TNF2, lies on the extended haplotype HLA-A1-B8-DR3-DQ2, which is associated with autoimmunity and high TNF alpha production. Homozygosity for TNF2 carries a sevenfold increased risk of death from cerebral malaria. Here we demonstrate, with reporter genes under the control of the two allelic TNF promoters, that TNF2 is a much stronger transcriptional activator than the common allele (TNF1) in a human B cell line. Footprint analysis using DNase I and B cell nuclear extract showed the generation of a hypersensitive site at -308 and an adjacent area of protection. There was no difference in affinity of the DNA-binding protein(s) between the two alleles. These results show that this polymorphism has direct effects on TNF alpha gene regulation and may be responsible for the association of TNF2 with high TNF alpha phenotype and more severe disease in infections such as malaria and leishmaniasis.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Pathogenesis of systemic lupus erythematosus.

            The exact patho-aetiology of systemic lupus erythematosus (SLE) remains elusive. An extremely complicated and multifactorial interaction among various genetic and environmental factors is probably involved. Multiple genes contribute to disease susceptibility. The interaction of sex, hormonal milieu, and the hypothalamo-pituitary-adrenal axis modifies this susceptibility and the clinical expression of the disease. Defective immune regulatory mechanisms, such as the clearance of apoptotic cells and immune complexes, are important contributors to the development of SLE. The loss of immune tolerance, increased antigenic load, excess T cell help, defective B cell suppression, and the shifting of T helper 1 (Th1) to Th2 immune responses leads to B cell hyperactivity and the production of pathogenic autoantibodies. Finally, certain environmental factors are probably required to trigger the disease.
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              AN INVESTIGATION OF POLYMORPHISM IN THE INTERLEUKIN-10 GENE PROMOTER

                Bookmark

                Author and article information

                Journal
                rbhh
                Revista Brasileira de Hematologia e Hemoterapia
                Rev. Bras. Hematol. Hemoter.
                Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular (São Paulo, SP, Brazil )
                1516-8484
                1806-0870
                August 2009
                : 31
                : 4
                : 241-246
                Affiliations
                [02] Maringá PR orgnameUniversidade Estadual de Maringá orgdiv1Medicina
                [01] Maringá PR orgnameLaboratório de Histocompatibilidade
                [03] Maringá PR orgnameUniversidade Estadual de Maringá orgdiv1Imunologia
                Article
                S1516-84842009000400011 S1516-8484(09)03100411
                10.1590/S1516-84842009005000055
                77331e82-1a1c-4aa1-80ad-845a8c3983be

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                : 20 October 2008
                : 08 April 2009
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 36, Pages: 6
                Product

                SciELO Brazil

                Categories
                Artigo

                IL2,metodologia,Citocinas,polimorfismos únicos de nucleotídeos,TNF,Cytokines,methodology,single nucleotide polymorphisms

                Comments

                Comment on this article