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The human DiGeorge syndrome critical region gene 8 and Its D. melanogaster homolog are required for miRNA biogenesis.

MicroRNAs (miRNAs) represent a family of small noncoding RNAs that are found in plants and animals (for recent reviews, see ). miRNAs are expressed in a developmentally and tissue-specific manner and regulate the translational efficiency and stability of partial or fully sequence-complementary mRNAs. miRNAs are excised in a stepwise process from double-stranded RNA precursors that are embedded in long RNA polymerase II primary transcripts (pri-miRNA). Drosha RNase III catalyzes the first excision event, the release in the nucleus of a hairpin RNA (pre-miRNA), which is followed by export of the pre-miRNA to the cytoplasm and further processing by Dicer to mature miRNAs. Here, we characterize the human DGCR8, the DiGeorge syndrome critical region gene 8, and its Drosophila melanogaster homolog. We provide biochemical and cell-based readouts to demonstrate the requirement of DGCR8 for the maturation of miRNA primary transcripts. RNAi knockdown experiments of fly and human DGCR8 resulted in accumulation of pri-miRNAs and reduction of pre-miRNAs and mature miRNAs. Our results suggest that DGCR8 and Drosha interact in human cells and reside in a functional pri-miRNA processing complex.

Pubmed ID: 15589161

Authors

  • Landthaler M
  • Yalcin A
  • Tuschl T

Journal

Current biology : CB

Publication Data

December 14, 2004

Associated Grants

  • Agency: NIGMS NIH HHS, Id: R01 GM068476-01

Mesh Terms

  • Animals
  • Blotting, Northern
  • Blotting, Western
  • Drosophila Proteins
  • Drosophila melanogaster
  • Gene Components
  • Gene Expression Regulation
  • HeLa Cells
  • Humans
  • MicroRNAs
  • Oligonucleotides
  • Plasmids
  • Protein Structure, Tertiary
  • Proteins
  • RNA Interference
  • RNA Polymerase II
  • RNA, Messenger
  • Reverse Transcriptase Polymerase Chain Reaction
  • Ribonuclease III