ArrayExpress Uploaderarrayexpress_sidmouseDicer HeterozygoteDicer HeterozygoteDicer HeterozygoteDicer NullDicer NullDicer Null716806MicroRNAs (miRNAs) are critical to proliferation, differentiation, and development. Here, we characterize gene expression in murine...E-GEOD-44162/profile/8773/arrayexpressuploader16cellfibroblastinner cell masssarcomastem cellDec.12, 2014Falselet-7-represses-nr6a1-and-a-mid-gestation-developmE-GEOD-44162_A-AFFY-45Let-7 represses Nr6a1 and a mid-gestation developmental program in adult fibroblasts [3p arrays]Nov.12, 2014MicroRNAs (miRNAs) are critical to proliferation, differentiation, and development. Here, we characterize gene expression in murine Dicer-null adult mesenchymal stem cell lines, a fibroblast cell type. Loss of Dicer leads to de-repression of let-7 targets at levels that exceed 10-100 fold with increases in transcription. Direct and indirect targets of this miRNA belong to a mid-gestation embryonic program that encompasses known oncofetal genes as well as oncogenes not previously associated with an embryonic state. Surprisingly, this mid-gestation program represents a distinct period that occurs between the pluripotent state of the inner cell mass at embryonic day 3.5 and the induction of let-7, upon differentiation, at embryonic day 10.5. Within this mid-gestation program, we characterize the let-7 target Nr6a1, an embryonic transcriptional repressor that regulates gene expression in adult fibroblasts following miRNA loss. In total, let-7 is required for the continual suppression of embryonic gene expression in adult cells, a mechanism that may underlie its tumor suppressive function. Three dicer heterozygotes and 3 dicer null sarcoma cell lines.http://www.ebi.ac.uk/arrayexpress/experiments/E-GEOD-44162http://www.ebi.ac.uk/arrayexpress/experiments/E-GEOD-44162/samples/