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Related Concept Videos

MicroRNAs01:22

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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MicroRNAs01:22

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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Genome-wide Screen for miRNA Targets Using the MISSION Target ID Library
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Cotargeting among microRNAs in the brain.

Jennifer M Cherone1, Vjola Jorgji2, Christopher B Burge1

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

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Combinations of microRNAs (miRNAs) work together to strongly control gene expression. This cotargeting mechanism, involving multiple miRNAs binding to the same messenger RNA, has significant roles in development.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • MicroRNAs (miRNAs) are key regulators of gene expression involved in development and disease.
  • Individual miRNAs typically cause modest gene repression, despite binding numerous messenger RNAs (mRNAs).
  • Co-targeting of mRNAs by multiple miRNAs could lead to more potent and complex gene regulation.

Purpose of the Study:

  • To investigate whether combinations of miRNAs cooperatively repress gene expression.
  • To identify pairs and groups of miRNAs that share common mRNA targets.
  • To explore the functional significance of miRNA cotargeting in biological processes.

Main Methods:

  • Comparative analysis of miRNA target sets to identify shared targets.
  • Genetic perturbation experiments to assess functional overlap.
  • Reporter assays to quantify gene repression by miRNA combinations.

Main Results:

  • Hundreds of miRNA pairs with significantly more shared mRNA targets than expected were identified.
  • A functional overlap in neuronal differentiation was observed for the cotargeting miRNA pair miR-138/miR-137.
  • A group of nine brain-enriched miRNAs was found to share numerous targets, exhibiting cooperative repression (5- to 10-fold) in reporter assays.

Conclusions:

  • Combinations of miRNAs collaborate to robustly repress shared mRNA targets.
  • MiRNA cotargeting represents an important regulatory mechanism with potential roles in development.
  • This study uncovers a novel pattern of miRNA-mediated gene regulation through cooperative action.