PLoS One. 2011; 6(12): e29758
Lee MP, Yutzey KE
Twist1, a basic helix-loop-helix transcription factor, is voiced in mesenchymal precursor populations during embryogenesis as well as in metastatic cancer cells. In the building heart, Twist1 is highly voiced in endocardial pillow (ECC) valve mesenchymal cells as well as is down regulated during valve split as well as remodeling. Previous studies demonstrated that Twist1 promotes dungeon proliferation, migration, as well as expression of primitive extracellular matrix (ECM) molecules in ECC mesenchymal cells. Furthermore, Twist1 expression is induced in human pediatric as well as adult infirm heart valves. However, the Twist1 downstream target genes that intercede increased dungeon proliferation as well as migration during early heart valve development remain mostly unknown. Candidate gene as well as tellurian gene profiling approaches were used to identify transcriptional targets of Twist1 during heart valve development. Candidate target genes were analyzed for evolutionarily conserved regions (ECRs) containing E-box consensus sequences that have been intensity Twist1 contracting sites. ECRs containing conserved E-box sequences were identified for Twist1 responsive genes Tbx20, Cdh11, Sema3C, Rab39b, as well as Gadd45a. Twist1 contracting to these sequences in vivo was determined by chromatin immunoprecipitation (ChIP) assays, as well as contracting was detected in ECCs but not late theatre remodeling valves. In addition identified Twist1 target genes have been highly voiced in ECCs as well as have reduced expression during heart valve remodeling in vivo, which is consistent with the expression pattern of Twist1. Together these analyses identify multiple new genes concerned in dungeon proliferation as well as migration that have been differentially voiced in the building heart valves, have been responsive to Twist1 transcriptional function, as well as contain Twist1-responsive regulatory sequences.
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