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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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lncRNA - Long Non-coding RNAs02:39

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In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
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Chasing non-existent "microRNAs" in cancer.

Ayla Orang1, Nicholas I Warnock1,2, Melodie Migault1

  • 1Centre for Cancer Biology, an alliance of SA Pathology and University of South Australia, Adelaide, South Australia, Australia.

Oncogenesis
|April 18, 2025
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Summary
This summary is machine-generated.

Many reported microRNAs (miRNAs) in cancer and Epithelial-Mesenchymal Transition (EMT) studies may not be functional. Researchers developed criteria to distinguish true miRNAs from RNA fragments, ensuring accurate gene regulation research.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Cancer Research

Background:

  • MicroRNAs (miRNAs) regulate gene expression and are implicated in cancer and Epithelial-Mesenchymal Transition (EMT).
  • Controversy exists regarding the number of functional miRNAs and the misidentification of RNA degradation products as miRNAs.
  • Functional miRNAs associate with Argonaute (AGO) proteins to form the RNA-Induced Silencing Complex (RISC) for target mRNA suppression.

Purpose of the Study:

  • To investigate the functional relevance of reported miRNAs in cancer and EMT contexts.
  • To differentiate genuine miRNAs from non-functional RNA fragments.
  • To establish criteria for identifying functional miRNAs within the RISC complex.

Main Methods:

  • Biochemical assays to assess miRNA incorporation into RISC.
  • Bioinformatic analyses to identify characteristics of functional miRNAs.
  • Comparison of endogenous miRNA activity versus artificial miRNA mimics.

Main Results:

  • Numerous "miRNAs" previously linked to EMT and cancer lack RISC incorporation and endogenous silencing capability.
  • Apparent functions of some "miRNAs" may stem from artificial mimics, not endogenous regulation.
  • Biochemical and bioinformatic criteria were developed to distinguish functional miRNAs from RNA fragments.

Conclusions:

  • Many purported miRNAs in cancer and EMT research may be non-functional RNA fragments.
  • The study provides a framework to re-evaluate existing miRNA data in these fields.
  • Accurate identification of functional miRNAs is crucial for understanding gene regulation and developing therapeutic strategies.