""These gene circuits can operate like our home electric circuits that control devices like appliances and automobiles," said Professor Nan Hao of the School of Biological Sciences' Department of Molecular Biology, the senior author of the study and co-
director of UC San Diego's Synthetic Biology Institute.

However, the UC San Diego group uncovered that, under the control of a central gene regulatory circuit, cells don't necessarily age the same way. Imagine a car that ages either as the engine deteriorates or as the transmission wears out, but not both at
the same time. The UC San Diego team envisioned a "smart aging process" that extends cellular longevity by cycling deterioration from one aging mechanism to another.

In the new study, the researchers genetically rewired the circuit that controls cell aging. From its normal role functioning like a toggle switch, they engineered a negative feedback loop to stall the aging process. The rewired circuit operates as a
clock-like device, called a gene oscillator, that drives the cell to periodically switch between two detrimental "aged" states, avoiding prolonged commitment to either, and thereby slowing the cell's degeneration.

These advances resulted in a dramatically extended cellular lifespan, setting a new record for life extension through genetic and chemical interventions.

As electrical engineers often do, the researchers in this study first used computer simulations of how the core aging circuit operates. This helped them design and test ideas before building or modifying the circuit in the cell. This approach has
advantages in saving time and resources to identify effective pro-longevity strategies, compared to more traditional genetic strategies.

"This is the first time computationally guided synthetic biology and engineering principles were used to rationally redesign gene circuits and reprogram the aging process to effectively promote longevity," said Hao."

https://www.sciencedaily.com/releases/2023/04/230427173454.htm

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