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CRISPR and crRNAs02:53

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
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Decoding RNA Metabolism by RNA-linked CRISPR Screening in Human Cells.

Patrick J Nugent1,2, Heungwon Park1, Cynthia L Wladyka3

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Summary

Researchers developed a new CRISPR screening method (ReLiC) to identify gene regulators of RNA metabolism. This approach reveals how gene networks control RNA splicing, translation, and decay, impacting cell growth and disease.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Human cells utilize thousands of RNA-associated proteins for RNA metabolism.
  • The complete set of regulators for most RNA metabolic events is largely unknown.
  • Understanding these regulators is crucial for comprehending cellular function and disease.

Purpose of the Study:

  • To develop a massively parallel screening approach to comprehensively identify regulators of RNA metabolism.
  • To investigate the interplay between gene networks controlling RNA splicing, translation, and decay.
  • To explore the coupling between cellular growth and mRNA translation, and identify drug targets.

Main Methods:

  • Development and application of a RNA-linked CRISPR (ReLiC) screening approach.
  • Knockout screening of 2,092 human genes encoding RNA-associated proteins.
  • Integration with biochemical fractionation of polysomes and chemogenomic profiling.

Main Results:

  • ReLiC screens revealed modular interactions within gene networks governing mRNA splicing, translation, and decay.
  • Pathway-specific coupling between growth fitness and mRNA translation was identified.
  • Differential regulation of intron retention and exon skipping was captured, and translational regulators upstream of mRNA decay were deciphered.

Conclusions:

  • ReLiC is a versatile platform for discovering and dissecting regulatory principles of human RNA metabolism.
  • The study identified novel insights into the complex regulation of RNA metabolic processes.
  • Findings have implications for understanding cellular responses to drugs and disease states.