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      Allele-specific PCR assay to genotype SNP rs7903146 in TCF7L2 gene for rapid screening of diabetes susceptibility Translated title: Ensaio de PCR alelo-específico para genotipar o SNP rs7903146 no gene TCF7L2 para rápida triagem de suscetibilidade ao diabetes

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          Abstract

          OBJECTIVE: The aim of the present study is to validate a rapid and simple allele-specific PCR that genotypes TCF7/L2 rs7903146 (C/T) polymorphism with standard PCR instruments. METHODS: Two forward primers with variations in their 3' nucleotides were designed in such a way that each was specific for one of the two variants. They were combined with a common reverse primer into two PCR reactions. Specific amplification indicates the presence of the allele. One hundred and four DNA samples were genotyped by this method. To evaluate the assay, the polymorphism spanning region of 63 DNA samples representing the three possible genotypes was sequenced. RESULTS: The rs7903146 allele assignments derived from the allele-specific PCR were in complete agreement with sequencing. CONCLUSIONS: The assay described here is a suitable strategy for the TCF7/L2 rs7903146 (C/T) genotyping also allowing rapid and reliable identification.

          Translated abstract

          OBJETIVO: O objetivo deste estudo foi validar um método de PCR alelo-específico, rápido e simples, para genotipagem do polimorfismo rs7903146 (C/T) no gene TCF7/L2 utilizando equipamentos convencionais. MÉTODOS: Dois primers forward com variações nos seus nucleotídeos 3' foram desenhados de forma que cada um fosse específico para uma das variantes. Eles foram combinados com um primer reverso comum em duas reações de PCR. A amplificação de tamanho específico indica a presença do alelo. Cento e quatro amostras de DNA foram genotipadas por esse método. Para validar o ensaio, uma amostragem representativa dos três possíveis genótipos (63 amostras) teve a região contendo o polimorfismo seqüenciada. RESULTADOS: A genotipagem do polimorfismo rs7903146 derivada da PCR alelo-específica estava em completa concordância com o sequenciamento. CONCLUSÕES: O ensaio aqui descrito é uma estratégia adequada para a genotipagem do polimorfismo rs7903146 (C/T) do gene TCF7/L2 e permite identificação alélica rápida e precisa.

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          Prime suspect: the TCF7L2 gene and type 2 diabetes risk.

          Transcription factor-7-like 2 (TCF7L2) is the most important type 2 diabetes susceptibility gene identified to date, with common intronic variants strongly associated with diabetes in all major racial groups. This ubiquitous transcription factor in the Wnt signaling pathway was not previously known to be involved in glucose homeostasis, so defining the underlying mechanism(s) will provide new insights into diabetes. In this issue of the JCI, Lyssenko and colleagues report on their human and isolated islet studies and suggest that the risk allele increases TCF7L2 expression in the pancreatic beta cell, reducing insulin secretion and hence predisposing the individual to diabetes (see the related article beginning on page 2155).
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            A genetic variation of the transcription factor 7-like 2 gene is associated with risk of type 2 diabetes in the Japanese population

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              Common single nucleotide polymorphisms in TCF7L2 are reproducibly associated with type 2 diabetes and reduce the insulin response to glucose in nondiabetic individuals

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                abem
                Arquivos Brasileiros de Endocrinologia & Metabologia
                Arq Bras Endocrinol Metab
                Sociedade Brasileira de Endocrinologia e Metabologia (São Paulo )
                1677-9487
                November 2008
                : 52
                : 8
                : 1362-1366
                Affiliations
                [1 ] Sabin Institute and Sabin Laboratory of Clinical Analysis Brazil
                [2 ] Universidade de Brasília Brazil
                Article
                S0004-27302008000800026
                10.1590/S0004-27302008000800026
                7e015f32-eda9-482e-91e8-b035440a3b76

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0004-2730&lng=en
                Categories
                ENDOCRINOLOGY & METABOLISM

                Endocrinology & Diabetes
                Type 2 diabetes,TCF7/L2,SNP,rs7903146,Diabetes tipo 2
                Endocrinology & Diabetes
                Type 2 diabetes, TCF7/L2, SNP, rs7903146, Diabetes tipo 2

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