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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Goljanek-whysall, Katarzyna Abu-elmagd, Muhammad Hornstein, Eran Sweetman, Dylan Dalmay, Tamas Chapnik, Elik Münsterberg, Andrea |
| Description | Author Affiliation: Goljanek-Whysall K ( Department of Cell and Developmental Biology, University of East Anglia, Norwich NR4 7TJ, United Kingdom.); |
| Abstract | Commitment of progenitors in the dermomyotome to myoblast fate is the first step in establishing the body musculature. Pax3 is a crucial transcription factor, important for skeletal muscle development and expressed in myogenic progenitors in the dermomyotome of developing somites and in migratory muscle progenitors that populate the limb buds. Down-regulation of Pax3 is essential to ignite the myogenic program, including up-regulation of myogenic regulators, Myf-5 and MyoD. MicroRNAs (miRNAs) confer robustness to developmental timing by posttranscriptional repression of genetic programs that are related to previous developmental stages or to alternative cell fates. Here we demonstrate that the muscle-specific miRNAs miR-1 and miR-206 directly target Pax3. Antagomir-mediated inhibition of miR-1/miR-206 led to delayed myogenic differentiation in developing somites, as shown by transient loss of myogenin expression. This correlated with increased Pax3 and was phenocopied using Pax3-specific target protectors. Loss of myogenin after antagomir injection was rescued by Pax3 knockdown using a splice morpholino, suggesting that miR-1/miR-206 control somite myogenesis primarily through interactions with Pax3. Our studies reveal an important role for miR-1/miR-206 in providing precision to the timing of somite myogenesis. We propose that posttranscriptional control of Pax3 downstream of miR-1/miR-206 is required to stabilize myoblast commitment and subsequent differentiation. Given that mutually exclusive expression of miRNAs and their targets is a prevailing theme in development, our findings suggest that miRNA may provide a general mechanism for the unequivocal commitment underlying stem cell differentiation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 29 |
| Volume Number | 108 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2011-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Differentiation Physiology Gene Expression Regulation, Developmental MicroRNAs Metabolism Muscle Development Paired Box Transcription Factors Animals Blotting, Western Genetics Cells, Cultured DEAD-box RNA Helicases Gene Knock-In Techniques Immunohistochemistry In Situ Hybridization Mice Myogenin Oligonucleotides Administration & Dosage Reverse Transcriptase Polymerase Chain Reaction Ribonuclease III Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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