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Mouse miR-290 cluster miRNAs are expressed specifically in early embryos and embryonic germ cells. These miRNAs play critical roles in the maintenance of pluripotency and self-renewal. Here, we showed that Cyclin D1 is a direct target gene of miR-290 cluster miRNAs. Negative relationships between the expression of Cyclin D1 protein and miR-290 cluster miRNAs in pluripotent and non-pluripotent cells, as well as in differentiating CGR8 cells were observed. Inhibition of miR-290 cluster miRNAs could arrest cells at the G1 phase and slow down the cell proliferation in CGR8 mouse stem cells. Since miR-290 cluster miRNAs are the most dominant stem-cell-specific miRNAs, our results revealed an important cause for the absence of Cyclin D1 in mouse embryonic stem cells.

miR-290 contributes to the low abundance of cyclin D1 protein in mouse embryonic stem cells