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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
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A signal x(t) is a set of data or a time function representing a variable of interest. Signals typically convey information about a phenomenon, such as atmospheric temperature, humidity, human voice, television images, a dog's bark, or birdsongs. More generally, a signal can be a function of more than one independent variable. For instance, images depend on horizontal and vertical positions and can be regarded as two-dimensional signals. However, this text will focus on one-dimensional...
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Updated: Dec 29, 2025

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Multiple Input Sensing and Signal Integration Using a Split Cas12a System.

Hannah R Kempton1, Laine E Goudy1, Kasey S Love1

  • 1Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.

Molecular Cell
|February 7, 2020
PubMed
Summary
This summary is machine-generated.

Scientists engineered a new CRISPR-Cas system for sophisticated cell engineering. This split dCas12a platform enables complex biological logic circuits for advanced synthetic biology applications.

Keywords:
AND gatesBoolean logicCRISPR-CasCpf1cell engineeringgenetic circuitsimmunotherapylogic gatessplit Cas12asynthetic biology

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Genetics

Background:

  • Sophisticated cell engineering requires integrating biological signals for functional responses.
  • The CRISPR-Cas system is a powerful tool for genome manipulation but underutilized for complex signal sensing and actuation.
  • Developing advanced synthetic biology tools is crucial for precise cellular control.

Purpose of the Study:

  • To develop a novel split dCas12a platform for constructing multi-input, multi-output logic circuits in mammalian cells.
  • To demonstrate the programmability and expandability of this system for complex biological computations.
  • To validate the system's potential for targeted cancer cell detection and therapeutic response.

Main Methods:

  • Development of a split dCas12a system for programmable logic gate construction.
  • Implementation of AND gates with varying inputs (two, three, and four).
  • Integration of NOT logic using anti-CRISPR proteins.
  • Coupling the system to tumor-specific promoters for targeted applications.

Main Results:

  • Successfully constructed multi-input, multi-output logic circuits in mammalian cells using the split dCas12a platform.
  • Demonstrated expandable AND gates and programmable NOT logic.
  • Showcased a proof-of-concept for specific breast cancer cell detection and immunomodulatory response.

Conclusions:

  • The split dCas12a platform offers a versatile and programmable tool for advanced synthetic biology.
  • This system enables complex biological signal integration and functional actuation.
  • The developed platform holds significant potential for targeted cancer therapies and diagnostics.