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Type: Artigo de periódico
Title: Influence of the polymorphisms of the alpha-major regulatory element HS-40 on in vitro gene expression
Author: Ribeiro, DM
Zaccariotto, TR
Santos, MNN
Costa, FF
Sonati, MF
Abstract: The alpha-MRE is the major regulatory element responsible for the expression of human alpha-like globin genes. It is genetically polymorphic, and six different haplotypes, named A to F, have been identified in some population groups from Europe, Africa and Asia and in native Indians from two Brazilian Indian tribes. Most of the mutations that constitute the alpha-MRE haplotypes are located in flanking sequences of binding sites for nuclear factors. To our knowledge, there are no experimental studies evaluating whether such variability may influence the alpha-MRE enhancer activity. We analyzed and compared the expression of luciferase of nine constructs containing different alpha-MRE elements as enhancers. Genomic DNA samples from controls with A (wild-type alpha-MRE) and B haplotypes were used to generate C-F haplotypes by site-directed mutagenesis. In addition, three other elements containing only the G. A polymorphism at positions + 130, + 199, and + 209, separately, were also tested. The different alpha-MRE elements were amplified and cloned into a plasmid containing the luciferase reporter gene and the SV40 promoter and used to transiently transfect K562 cells. A noticeable reduction in luciferase expression was observed with all constructs compared with the A haplotype. The greatest reductions occurred with the F haplotype (+ 96, C. A) and the isolated polymorphism + 209, both located near the SP1 protein-binding sites believed not to be active in vivo. These are the first analyses of alpha-MRE polymorphisms on gene expression and demonstrate that these single nucleotide polymorphisms, although outside the binding sites for nuclear factors, are able to influence in vitro gene expression.
Subject: Alpha-major regulatory element
Alpha-globin genes
Genetic polymorphisms
Gene expression
Country: Brasil
Editor: Assoc Bras Divulg Cientifica
Citation: Brazilian Journal Of Medical And Biological Research. Assoc Bras Divulg Cientifica, v. 42, n. 9, n. 783, n. 786, 2009.
Rights: aberto
Identifier DOI: 10.1590/S0100-879X2009005000014
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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