Epigenetics knocks on synthetic biology's door

Area of Science:

• Synthetic biology
• Epigenetics
• Bacterial gene regulation

Background:

• Epigenetics involves heritable gene expression changes without DNA sequence alteration.
• Epigenetics is crucial in development, differentiation, and health, with potential in synthetic biology.
• Epigenetic regulation in bacterial synthetic biology remains largely unexplored.

Purpose of the Study:

• To present the first model of an epigenetic circuit for bacterial synthetic biology.
• To demonstrate heritable cellular fate switching without genomic changes.
• To investigate epigenetic memory in bacterial systems.

Main Methods:

• Design and implementation of a novel epigenetic circuit model.
• Characterization of the circuit's heritable state-switching properties.
• Analysis of the circuit's behavior, including hysteresis.

Main Results:

• The developed circuit, termed the
• enables parental cells and progeny to alternate between distinct, heritable cellular fates.
• This alternation occurs without any changes to the underlying genome sequence.
• The circuit exhibits hysteresis, meaning its output is influenced by past states.

Conclusions:

• The alternator circuit represents a significant advancement in bacterial synthetic biology.
• This model provides a foundation for engineering epigenetic memory in bacteria.
• The findings open new avenues for controlling cellular behavior through epigenetic mechanisms.