BACKGROUND: Embryonic ectoderm development (EED) protein is involved in multiple cellular protein complexes. EED mediates the repression of gene activity through histone deacetylation, and it may act as a specific regulator of integrin's function. This gene was identified as a candidate gene for the susceptibility to IBD by our previous cDNA microarray analysis. AIM: The present study aimed to validate the expression level of the EED gene in patients with IBD by performing RT-PCR, and we investigated whether the polymorphisms in the EED gene are associated with the susceptibility to UC, and whether a functional EED promoter polymorphism is related to UC. METHODS: Genotype analysis of the EED SNPs was performed by single-base extension analysis. The haplotype frequencies of the EED gene for multiple loci were estimated using the expectation maximization algorithm. The promoter region of the human EED gene, including the g.-1850G>C allele, was isolated by PCR. The amplified PCR products were inserted into the pGL3-basic vector and the luciferase activity was analyzed. RESULTS: The expression level of the EED gene was significantly decreased in both the UC and CD patients and it was significantly higher in the liver and ileum than in the other tissues of the human digestive system. The genotype and allele frequencies of the g.-1850G>C polymorphism of the EED gene in the UC patients were significantly different from those of the healthy controls (p = 0.018 and 0.017, respectively). The luciferase activity assay showed that the promoter activity was decreased about twofold in the construct containing the g.-1850G allele compared to that of the construct containing the g.-1850C allele, which means that the allele G could produce less EED mRNA. CONCLUSIONS: These results suggest that the g.-1850G>C polymorphism in the EED gene might be associated with the susceptibility to UC by the change of the EED expression level.
BACKGROUND:Embryonic ectoderm development (EED) protein is involved in multiple cellular protein complexes. EED mediates the repression of gene activity through histone deacetylation, and it may act as a specific regulator of integrin's function. This gene was identified as a candidate gene for the susceptibility to IBD by our previous cDNA microarray analysis. AIM: The present study aimed to validate the expression level of the EED gene in patients with IBD by performing RT-PCR, and we investigated whether the polymorphisms in the EED gene are associated with the susceptibility to UC, and whether a functional EED promoter polymorphism is related to UC. METHODS: Genotype analysis of the EED SNPs was performed by single-base extension analysis. The haplotype frequencies of the EED gene for multiple loci were estimated using the expectation maximization algorithm. The promoter region of the humanEED gene, including the g.-1850G>C allele, was isolated by PCR. The amplified PCR products were inserted into the pGL3-basic vector and the luciferase activity was analyzed. RESULTS: The expression level of the EED gene was significantly decreased in both the UC and CDpatients and it was significantly higher in the liver and ileum than in the other tissues of the human digestive system. The genotype and allele frequencies of the g.-1850G>C polymorphism of the EED gene in the UC patients were significantly different from those of the healthy controls (p = 0.018 and 0.017, respectively). The luciferase activity assay showed that the promoter activity was decreased about twofold in the construct containing the g.-1850G allele compared to that of the construct containing the g.-1850C allele, which means that the allele G could produce less EED mRNA. CONCLUSIONS: These results suggest that the g.-1850G>C polymorphism in the EED gene might be associated with the susceptibility to UC by the change of the EED expression level.
Authors: Laurie A Boyer; Kathrin Plath; Julia Zeitlinger; Tobias Brambrink; Lea A Medeiros; Tong Ihn Lee; Stuart S Levine; Marius Wernig; Adriana Tajonar; Mridula K Ray; George W Bell; Arie P Otte; Miguel Vidal; David K Gifford; Richard A Young; Rudolf Jaenisch Journal: Nature Date: 2006-04-19 Impact factor: 49.962
Authors: Young Ran Park; Suck Chei Choi; Soo Teik Lee; Kyung Suk Kim; Soo Cheon Chae; Hun Taeg Chung Journal: Exp Mol Med Date: 2005-12-31 Impact factor: 8.718
Authors: R G Sewalt; J van der Vlag; M J Gunster; K M Hamer; J L den Blaauwen; D P Satijn; T Hendrix; R van Driel; A P Otte Journal: Mol Cell Biol Date: 1998-06 Impact factor: 4.272
Authors: J P Hugot; P Laurent-Puig; C Gower-Rousseau; J M Olson; J C Lee; L Beaugerie; I Naom; J L Dupas; A Van Gossum; M Orholm; C Bonaiti-Pellie; J Weissenbach; C G Mathew; J E Lennard-Jones; A Cortot; J F Colombel; G Thomas Journal: Nature Date: 1996-02-29 Impact factor: 49.962
Authors: Antonis Kirmizis; Stephanie M Bartley; Andrei Kuzmichev; Raphael Margueron; Danny Reinberg; Roland Green; Peggy J Farnham Journal: Genes Dev Date: 2004-07-01 Impact factor: 11.361