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Lineage-specific transcriptional regulation of DICER by MITF in melanocytes.

Cell | Jun 11, 2010

http://www.ncbi.nlm.nih.gov/pubmed/20550935

DICER is a central regulator of microRNA maturation. However, little is known about mechanisms regulating its expression in development or disease. While profiling miRNA expression in differentiating melanocytes, two populations were observed: some upregulated at the pre-miRNA stage, and others upregulated as mature miRNAs (with stable pre-miRNA levels). Conversion of pre-miRNAs to fully processed miRNAs appeared to be dependent upon stimulation of DICER expression--an event found to occur via direct transcriptional targeting of DICER by the melanocyte master transcriptional regulator MITF. MITF binds and activates a conserved regulatory element upstream of DICER's transcriptional start site upon melanocyte differentiation. Targeted KO of DICER is lethal to melanocytes, at least partly via DICER-dependent processing of the pre-miRNA-17 approximately 92 cluster thus targeting BIM, a known proapoptotic regulator of melanocyte survival. These observations highlight a central mechanism underlying lineage-specific miRNA regulation which could exist for other cell types during development.

Pubmed ID: 20550935 RIS Download

Mesh terms: Animals | Apoptosis Regulatory Proteins | Cell Differentiation | Cell Survival | Cells, Cultured | Epidermis | Gene Expression Regulation | Gene Knockdown Techniques | Hair Follicle | Humans | Melanocytes | Membrane Proteins | Mice | Mice, Inbred C57BL | MicroRNAs | Microphthalmia-Associated Transcription Factor | Promoter Regions, Genetic | Proto-Oncogene Proteins | Ribonuclease III | Transcription, Genetic | Up-Regulation

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Associated grants

  • Agency: NIAMS NIH HHS, Id: R01 AR043369
  • Agency: NIAMS NIH HHS, Id: R01 AR043369-14
  • Agency: Howard Hughes Medical Institute, Id:

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