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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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Engineering complex synthetic transcriptional programs with CRISPR RNA scaffolds.

Jesse G Zalatan1, Michael E Lee2, Ricardo Almeida1

  • 1Department of Cellular and Molecular Pharmacology, University of California San Francisco, San Francisco, CA 94158, USA; Howard Hughes Medical Institute, University of California San Francisco, San Francisco, CA 94158, USA.

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Researchers developed CRISPR-based RNA scaffolds to create synthetic gene expression programs. This technology enables precise control over multiple genes for applications like metabolic engineering and cell fate determination.

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Genetics

Background:

  • Eukaryotic cells utilize complex transcriptional programs for gene regulation.
  • Targeted regulatory assemblies control specific genomic loci.
  • CRISPR-Cas9 technology offers precise genome editing capabilities.

Purpose of the Study:

  • To engineer synthetic transcriptional programs using CRISPR technology.
  • To demonstrate the modularity and flexibility of scaffold RNAs for gene regulation.
  • To control complex metabolic pathways in yeast.

Main Methods:

  • Extended guide RNAs to include effector protein recruitment sites, creating modular scaffold RNAs.
  • Designed sets of scaffold RNAs to activate or repress specific genes.
  • Utilized dCas9 (CRISPR-associated protein 9) as a master regulatory control point.

Main Results:

  • Successfully constructed synthetic multigene transcriptional programs in yeast and human cells.
  • Demonstrated the ability to flexibly redirect metabolic flux through a branched pathway in yeast.
  • Showcased CRISPR-associated RNA scaffolds as a powerful tool for synthetic biology.

Conclusions:

  • CRISPR-associated RNA scaffolds enable the construction of sophisticated synthetic gene expression programs.
  • This approach provides a modular and flexible platform for rewiring cell fates and engineering metabolic pathways.
  • The dCas9 system acts as a single master control point for executing these synthetic programs.