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Global Regulatory Systems01:28

Global Regulatory Systems

Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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Prokaryotic Transcriptional Activators and Repressors01:58

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Constitutive and Regulated Gene Expression01:27

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Gene Digital Circuits Based on CRISPR-Cas Systems and Anti-CRISPR Proteins
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Engineering input/output nodes in prokaryotic regulatory circuits.

Aitor de Las Heras1, Carlos A Carreño, Esteban Martínez-García

  • 1Centro Nacional de Biotecnología-CSIC, Systems Biology Program, Campus de Cantoblanco, Madrid 28049, Spain.

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Summary

This review explores engineering biological circuits using prokaryotic regulatory elements for specific gene expression. It covers regulatory assets, reporter genes for quantification, and novel reporters for bacterial behavior modification.

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Area of Science:

  • Synthetic Biology
  • Molecular Engineering
  • Genetic Circuit Design

Background:

  • Prokaryotic regulatory elements are engineered into biological circuits for controlled gene expression.
  • Circuit design involves integrating signal-recognition, signal-transduction, and genetic modules.
  • This enables autonomous, signal-responsive expression programs within a defined network topology.

Purpose of the Study:

  • To review advancements in the forward engineering of signal-responsive genetic parts.
  • To discuss regulatory assets, reporter gene technologies, and novel reporter applications.
  • To provide a comprehensive overview of designing and implementing synthetic biological circuits.

Main Methods:

  • Review of natural and non-natural regulatory elements, including in vitro evolved transcriptional regulators and synthetic riboswitches.
  • Examination of reporter genes for quantifying and parametrizing signal-responsive circuits.
  • Analysis of recent work on reporters conferring organoleptic properties and interfacing with community behavior determinants.

Main Results:

  • Identification of diverse regulatory assets for signal-specific gene expression.
  • Progress in reporter gene development for circuit quantification and parametrization.
  • Emerging applications of reporters for modulating bacterial properties and community interactions.

Conclusions:

  • Forward engineering of signal-responsive genetic circuits is advancing rapidly.
  • Reporter technologies are crucial for characterizing and controlling synthetic biological systems.
  • Future directions include integrating circuits with bacterial community behaviors and sensory outputs.