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Roles of bta-miR-29b promoter regions DNA methylation in regulating miR-29b expression and bovine viral diarrhea virus NADL replication in MDBK cells.
Archives of Virology 2017 Februrary
MicroRNAs (miRNAs) are an important class of small, non-coding RNAs that control target genes expression by degradation of target mRNAs or by inhibiting protein translation in many biological processes and cellular pathways. In a previous study, we found that miR-29b interfered with bovine viral diarrhea virus (BVDV) replication. However, the mechanisms of regulation of miR-29b expression are not well known. DNA methylation is an important epigenetic mechanism for silencing gene transcription, and plays an important role in promoter choice, protein expression, and regulation of miRNAs expression. In this study, we focused on the roles of DNA methylation of miR-29b promoter in regulating miR-29b expression and investigated the effects of DNA (cytosine-5) methyltransferase 1 (DNMT1) knockdown on miR-29b expression and BVDV (strain NADL) replication. Our results showed that methylation levels of miR-29b promoter were significantly decreased in BVDV NADL-infected MDBK cells. Furthermore, DNMT1 silencing significantly decreased the methylation levels of miR-29b promoter, up-regulated miR-29b expression and inhibited BVDV NADL replication, which supports the important roles of DNA methylation in regulating miRNA expression and further proves an evidence for our previous views.
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