Related Experiment Video
Updated: Jun 27, 2026
07:23
Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome
Published on: June 15, 2016
Extracellular MicroRNAs: A Stable and Diverse Source of Transcriptional Control
Megan I Mitchell1, Olivier Loudig1,2
1Center for Discovery and Innovation, Hackensack Meridian Health (HMH), Nutley, NJ 07110, USA.
Biomolecules
|June 26, 2026
Summary
MicroRNAs (miRNAs) are key regulators of gene expression implicated in diseases like cancer. Extracellular vesicle (EV)-miRNAs show promise as non-invasive biomarkers, but their packaging involves complex sorting mechanisms.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression.
- miRNA dysregulation is linked to diseases, especially cancer.
- miRNAs within extracellular vesicles (EVs) are potential non-invasive biomarkers.
Purpose of the Study:
- To review evidence of EV-miRNAs as disease biomarkers.
- To examine molecular mechanisms of miRNA sorting into EVs.
- To clarify the relationship between cellular miRNA levels and EV cargo.
Main Methods:
- Literature review and synthesis of current research.
- Analysis of molecular mechanisms governing miRNA packaging into EVs.
- Integration of data on EV-miRNA profiles and cellular miRNA expression.
Main Results:
- EV-miRNA profiles can differ from intracellular miRNA abundance.
- Specific sorting mechanisms (EXOmotifs, RNA-binding proteins, lipid pathways) dictate EV miRNA content.
- These mechanisms allow selective packaging of miRNAs into EVs.
Conclusions:
- EV-associated miRNAs are valuable biomarkers, but their signatures are complex.
- Understanding miRNA sorting mechanisms is crucial for diagnostic and prognostic applications.
- Standardized frameworks are needed to enhance the translational utility of EV-miRNAs.
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01:22MicroRNAs
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 ends...
01:22MicroRNAs
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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