Embryonic stem cell-specific miR302-367 cluster: human gene structure and functional characterization of its core promoter.

Molecular and Cellular Biology
Alicia Barroso-delJesusPablo Menendez

Abstract

MicroRNAs (miRNAs) play a central role in the regulation of multiple biological processes including the maintenance of stem cell self-renewal and pluripotency. Recently, the miRNA cluster miR302-367 was shown to be differentially expressed in embryonic stem cells (ESCs). Unfortunately, very little is known about the genomic structure of miRNA-encoding genes and their transcriptional units. Here, we have characterized the structure of the gene coding for the human miR302-367 cluster. We identify the transcriptional start and functional core promoter region which specifically drives the expression of this miRNA cluster. The promoter activity depends on the ontogeny and hierarchical cellular stage. It is functional during embryonic development, but it is turned off later in development. From a hierarchical standpoint, its activity decays upon differentiation of ESCs, suggesting that its activity is restricted to the ESC compartment and that the ESC-specific expression of the miR302-367 cluster is fully conferred by its core promoter transcriptional activity. Furthermore, algorithmic prediction of transcription factor binding sites and knockdown studies suggest that ESC-associated transcription factors, including Nanog, Oct3/4, Sox...Continue Reading

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