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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...
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MALAT1 Expression Is Deregulated in miR-34a Knockout Cell Lines.

Andrea Corsi1, Tonia De Simone1, Angela Valentino1

  • 1Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Strada le Grazie 8, 37134 Verona, Italy.

Non-Coding RNA
|August 27, 2025
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Summary

MicroRNA-34a (miR-34a) knockout cells showed reduced proliferation and increased MALAT1 expression, revealing a novel miR-34a/MALAT1 axis that regulates cell growth.

Keywords:
CRISPRMALAT1gene editinghsa-miR-34alncRNAmiR-34amiRNA

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • MicroRNA-34a (miR-34a) is a non-coding microRNA crucial for regulating cellular processes like differentiation, apoptosis, and proliferation.
  • Dysregulation of miR-34a is linked to various diseases, including cancer and inflammatory conditions.
  • The precise molecular mechanisms governed by miR-34a are not fully elucidated.

Purpose of the Study:

  • To generate miR-34a knockout cell lines to identify novel genes regulated by miR-34a.
  • To investigate the functional impact of miR-34a ablation on cellular processes.

Main Methods:

  • Utilized CRISPR-Cas9 gene editing to create miR-34a knockout HeLa and 293T cell lines.
  • Assessed proliferation rates and analyzed gene expression profiles using RNA-seq and qPCR.
  • Validated findings by examining MALAT1 expression following miR-34a-5p silencing in melanoma cells.

Main Results:

  • miR-34a knockout led to a significant decrease in cell proliferation in both cell lines.
  • Ablation of miR-34a resulted in the upregulation of the long non-coding RNA MALAT1.
  • miR-34a-5p silencing in melanoma cells also caused MALAT1 overexpression.

Conclusions:

  • The study identified a novel regulatory axis involving miR-34a and MALAT1.
  • This miR-34a/MALAT1 axis plays a role in the regulation of cellular proliferation processes.