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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...
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Isolation and Identification of Gene-Specific MicroRNAs.

Shi-Lung Lin1, Donald C Chang2, Shao-Yao Ying3

  • 1Division of Regenerative Medicine, WJWU & LYNN Institute for Stem Cell Research, Santa Fe Springs, CA, USA. shilungl@mirps.org.

Methods in Molecular Biology (Clifton, N.J.)
|February 14, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed an intronic microRNA (miRNA) expression system to enhance RNA interference (RNAi) gene silencing. This novel system efficiently produces mature miRNAs from intronic sequences, demonstrating strong RNAi effects in vitro and in vivo.

Keywords:
Asymmetric assemblyGene cloningMicroRNA (miRNA) biogenesisRNA interference (RNAi)RNA-induced gene silencing complex (RISC)Zebrafish

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Genomic hairpin sequences are abundant, but their functions are often unknown.
  • Transfecting microRNA precursors (pre-miRNAs) into cells doesn't always initiate RNA-induced gene silencing complex (RISC) assembly for RNA interference (RNAi).

Purpose of the Study:

  • To develop an intronic miRNA expression system to improve the efficiency of miRNA-associated RNAi induction.
  • To overcome limitations of direct pre-miRNA transfection in triggering RISC assembly.

Main Methods:

  • Inserted hairpin-like pre-miRNA structures into the intron region of a gene.
  • Investigated intronic miRNA biogenesis involving nascent mRNA transcription and intron excision.
  • Utilized type-II RNA polymerases and intracellular RNA splicing machinery for miRNA transcription and processing.
  • Employed ribonuclease III (RNaseIII) endonucleases to mature spliced introns into miRNAs.
  • Developed a miRNA isolation protocol based on sequence complementarity for purification and identification.

Main Results:

  • The intronic miRNA expression system successfully increased miRNA-associated RNAi efficiency in vitro and in vivo.
  • Demonstrated strong RNAi effects from intron-derived miRNAs in human and mouse cells, zebrafishes, chicken embryos, and adult mice.
  • Confirmed several intronic miRNA identities and structures using the developed isolation protocol.

Conclusions:

  • The intronic miRNA expression system provides a robust method for inducing RNAi.
  • Intron-derived miRNAs are effective in eliciting gene silencing across various biological systems.
  • This proof-of-principle methodology enables the design of efficient intronic pre-miRNA inserts for targeted gene silencing.