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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 the pre-miRNA...
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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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Regulation of Expression Occurs at Multiple Steps02:24

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Structural dynamics control the MicroRNA maturation pathway.

Paul Dallaire1, Huiping Tan2, Keith Szulwach2

  • 1Institute for Research in Immunology and Cancer, and Department of Computer Science and Operations Research, Université de Montréal, PO Box 6128, Downtown Station, Montréal, Québec H3C 3J7, Canada.

Nucleic Acids Research
|September 22, 2016
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Summary
This summary is machine-generated.

A single nucleotide polymorphism (SNP) in microRNA-125a (miR-125a) affects its maturation. Transient RNA structures, visualized by a new quantitative model, correlate with miRNA maturation, offering insights into gene regulation in diseases like breast cancer.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Bioinformatics

Background:

  • MicroRNAs (miRNAs) regulate gene expression and are implicated in disease development.
  • Low miR-125a expression correlates with poor breast cancer prognosis.
  • A specific single nucleotide polymorphism (SNP) in miR-125a is found in breast cancer patients but its effect on maturation is unclear.

Purpose of the Study:

  • To investigate how a specific SNP in miR-125a affects its maturation process.
  • To develop a quantitative model for visualizing and comparing transient RNA structures.
  • To understand the role of transient structures in microRNA homeostasis.

Main Methods:

  • Utilized a quantitative model based on RNA dynamics and nuclear magnetic resonance data.
  • Visualized and compared networks of transient RNA structures.
  • Analyzed the correlation between structural variant distances and miRNA maturation.
  • Classified human miRNAs based on transient structure network distances.

Main Results:

  • A high correlation was observed between distances in transient structure networks and the degree of miRNA maturation.
  • The study suggests transient structures play a significant role in maintaining microRNA homeostasis.
  • A method for classifying miRNAs based on their transient structural networks was developed.

Conclusions:

  • Transient RNA structures are critical for microRNA maturation and homeostasis.
  • The developed quantitative model provides a novel approach to study RNA dynamics and miRNA regulation.
  • Understanding SNP-mediated effects on miRNA maturation is crucial for disease prognosis and therapeutic strategies.