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Cas9 gRNA engineering for genome editing, activation and repression.

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Altering guide RNA length controls Cas9 nuclease activity, enabling simultaneous genome editing and transcriptional regulation. This innovation engineers mammalian synthetic circuits with combined transcriptional regulation and kill functions using one Cas9 protein.

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Gene Editing Technologies

Background:

  • The CRISPR-Cas9 system is a powerful tool for genome editing.
  • Controlling Cas9 activity for multiple functions remains a challenge.

Purpose of the Study:

  • To demonstrate that guide RNA length can modulate Cas9 nuclease activity.
  • To engineer a single Cas9 protein for simultaneous genome editing and transcriptional regulation.
  • To develop mammalian synthetic circuits with integrated regulatory and cell-killing functions.

Main Methods:

  • Systematic alteration of guide RNA lengths.
  • Assays to measure Cas9 nuclease activity.
  • Engineering of synthetic gene circuits in mammalian cells.
  • Characterization of multifunctional Cas9 protein activity.

Main Results:

  • Guide RNA length directly correlates with and controls Cas9 nuclease activity.
  • A single Cas9 protein was engineered to perform both genome editing and transcriptional regulation.
  • Successfully designed mammalian synthetic circuits with combined transcriptional regulation and kill functions.

Conclusions:

  • Guide RNA length is a critical determinant of Cas9 activity, offering precise control.
  • A single multifunctional Cas9 protein can be leveraged for complex synthetic biology applications.
  • This approach enables the development of sophisticated programmable genetic circuits.