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Related Concept Videos

Genetic Screens02:46

Genetic Screens

Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which result in visible changes...
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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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Mammalian genome-wide loss-of-function screens using arrayed small interfering RNA expression libraries.

Lianxing Zheng1, Sheng Ding

  • 1Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

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RNA interference (RNAi) utilizes small interfering RNAs (siRNAs) for gene silencing. Synthetically prepared siRNAs enable specific gene silencing in mammalian cells without triggering unwanted immune responses.

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Area of Science:

  • Molecular Biology
  • Functional Genomics
  • RNA Interference

Background:

  • RNA interference (RNAi) is a natural process for gene silencing found across various organisms.
  • RNAi mechanisms involve the cleavage of long double-stranded RNAs (dsRNAs) into small interfering RNAs (siRNAs) by Dicer.
  • siRNAs are processed into single-stranded RNAs that guide the RNA-induced silencing complex (RISC) to target messenger RNAs (mRNAs) for degradation.

Purpose of the Study:

  • To investigate the mechanism of RNA interference for functional genomics studies.
  • To address the challenge of non-specific gene silencing caused by long dsRNAs in mammalian cells.
  • To establish a method for specific and effective gene silencing in mammalian systems.

Main Methods:

  • Mechanistic investigation of RNA interference pathways.
  • Analysis of dsRNA processing by Dicer and incorporation into RISC.
  • Comparison of gene silencing effects of long dsRNAs versus short siRNAs in mammalian cells.

Main Results:

  • Long dsRNAs activate the PKR pathway in mammalian cells, leading to non-specific gene silencing.
  • Short, chemically synthesized 21-23 bp siRNAs bypass PKR activation.
  • siRNA-based gene silencing in mammalian cells is specific and effective without immune activation.

Conclusions:

  • The use of short siRNAs is a viable strategy for specific gene silencing in mammalian systems.
  • siRNA technology revolutionizes functional genomics by enabling targeted loss-of-function studies.
  • Avoiding PKR activation through the use of short siRNAs is crucial for effective gene silencing in mammals.