Previous researches have demonstrated that miRNAs are abundant endogenous ~22-nucleotide (nt) noncoding RNAs, occupying between 1 5% of the genes in any given animal genome [ 34]. miRNAs regulate gene expression at the post-transcriptional level for cleavage or translational repression through the binding of a minimal-recognition 'seed' sequence [ 35- 38].
The TOPflash construct contains eight Tcf/Lef binding sites upstream of a minimal TA viral promoter and the firefly luciferase cDNA.
Cells were co-transfected with 1.3 ug of pFN11A-AR624-919, 1.3 ug of pFN10A-1-660, 1.3 ug of pGL4.31 (containing five GAL4 binding sites upstream of a minimal TATA box, which is upstream of a firefly luciferase gene that acts as a reporter for interactions between proteins), and 1 ng of phRL-TK carrying the Renilla luciferase gene.
Specifically, each repressible promoter was designed to contain 5 Gal4 binding sequences upstream of a minimal CMV promoter, where Gal4-VP16 is constitutively expressed.
Cells were transiently transfected with a synthetic TCF reporter plasmid TOPflash (which consists of three TCF binding sites upstream of a minimal tk promoter and the Luciferase open reading frame), prior to treatment with NSAIDs.
It contains three Tcf binding sites upstream of a minimal promoter and luciferase reporter gene, and in many cases the increased Topflash activity that has been observed in response to overexpression of plakoglobin in transfected cells could be as a result of modifying β-catenin degradation and/or subcellular localisation.
A 10 parameter ZF/DNA atomic interaction code was developed using five crystals (Elrod-Erickson et al., 1996; Elrod-Erickson et al., 1998; Kang, 2007) as templates for homology models of ZF structures and binding modes, a minimal set of binding affinities from seven mutants of finger I of EGR (Liu and Stormo, 2005) and three mutants of finger III (Bae et al., 2003).
TOPGAL mice express β-galactosidase under the control of β-catenin-responsive consensus TCF/LEF-binding motifs upstream of a minimal fos promoter (DasGupta and Fuchs, 1999).
The constructs were transfected into mammalian cells along with the pG5-Luc vector, which contains five GAL4-binding sites upstream of a minimal TATA box upstream of the luciferase gene.
To this end, we used the TOPGAL reporter transgenic mouse line, which carries the lacZ gene (encoding β-galactosidase) under the control of three tandem β-catenin-responsive consensus TCF/LEF-binding motifs upstream of a minimal fos promoter, as an unbiased readout system of canonical Wnt activity at different stages post-MI (DasGupta and Fuchs, 1999).
Specifically, we identified three Fkh-binding sites in a minimal enhancer of the Ndg gene, which mediate the effects of different cell type-specific Fkh TFs and are used in various combinations to regulate enhancer activity in a subset of somatic myoblasts, in differentiated visceral muscle and in progenitors of both the cardial and pericardial cells of the heart (Fig. 7).
