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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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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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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
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Using artificial microRNA sponges to achieve microRNA loss-of-function in cancer cells.

Felix Chang Tay1, Jia Kai Lim2, Haibao Zhu1

  • 1Department of Biological Sciences, National University of Singapore, Singapore.

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|May 27, 2014
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MicroRNA (miRNA) sponge technology offers a novel approach to cancer therapy by inhibiting oncogenic miRNAs. This method also aids in understanding miRNA functions in cancer development.

Keywords:
Cancer studiesOncogenic and tumor-suppressive miRNAPlasmid and viral deliverymiRNA loss-of-functionmiRNA sponge

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • MicroRNAs (miRNAs) are widely dysregulated in human cancers, suggesting roles in cancer development.
  • Targeting miRNA expression is a potential strategy for cancer treatment and research.

Purpose of the Study:

  • To discuss the design and application of miRNA sponge expression vectors.
  • To explore the utility of miRNA sponges in understanding miRNA roles in cancer biology.
  • To present miRNA sponges as an alternative tool for anticancer gene therapy.

Main Methods:

  • Development of miRNA sponge technology using plasmid or viral vectors.
  • Intracellular expression of tandemly arrayed, bulged miRNA binding sites.
  • Utilizing strong viral promoters for high-level expression of inhibitor transcripts.

Main Results:

  • miRNA sponges effectively inhibit miRNA function by saturating miRNA targets.
  • This technology allows for simultaneous knockdown of multiple miRNAs within a family.
  • Demonstrated potential for therapeutic knockdown of oncogenic miRNAs and deciphering tumor-suppressive miRNA functions.

Conclusions:

  • miRNA sponge technology is a powerful tool for both cancer gene therapy and fundamental research into miRNA functions.
  • The ability to target miRNA families offers a versatile approach for complex gene regulation studies.
  • This technology provides a rational strategy for developing novel anticancer therapies.