Abstract
MicroRNAs (miRNAs) have been implicated in cell-cycle regulation and in some cases shown to have a role in tissue growth control. Depletion of miRNAs was found to have an effect on tissue growth rates in the wing primordium of Drosophila, a highly proliferative epithelium. Dicer-1 (Dcr-1) is a double-stranded RNAseIII essential for miRNA biogenesis. Adult cells lacking dcr-1, or with reduced dcr-1 activity, were smaller than normal cells and gave rise to smaller wings. dcr-1 mutant cells showed evidence of being susceptible to competition by faster growing cells in vivo and the miRNA machinery was shown to promote G(1)-S transition. We present evidence that Dcr-1 acts by regulating the TRIM-NHL protein Mei-P26, which in turn regulates dMyc protein levels. Mei-P26 is a direct target of miRNAs, including the growth-promoting bantam miRNA. Thus, regulation of tissue growth by the miRNA pathway involves a double repression mechanism to control dMyc protein levels in a highly proliferative and growing epithelium.
| Original language | English |
|---|---|
| Journal | E M B O Journal |
| Volume | 29 |
| Issue number | 10 |
| Pages (from-to) | 1688-98 |
| Number of pages | 11 |
| ISSN | 0261-4189 |
| DOIs | |
| Publication status | Published - 19 May 2010 |
| Externally published | Yes |
Keywords
- Animals
- Cell Cycle
- Cell Proliferation
- Drosophila Proteins
- Drosophila melanogaster
- E2F Transcription Factors
- Epithelium
- Female
- G1 Phase
- Genotype
- Male
- MicroRNAs
- Models, Biological
- Proto-Oncogene Proteins c-myc
- RNA Helicases
- Ribonuclease III
- S Phase
- Wing