Synthetic Biology

Synthetic biology combines principles from engineering, molecular biology and computer science to design and construct new biological parts, devices and systems, as well as to reprogramme existing organisms for bespoke functions. It relies on standardised, modular genetic components—promoters, ribosome-binding sites, regulators and terminators—that can be assembled into gene circuits performing logic, oscillation or sensing. Advances in DNA synthesis and assembly, gene-editing tools and computational modelling underpin a rapid design–build–test–learn cycle. Engineered organisms range from bacteria programmed to detect disease-associated metabolites, to yeast optimised for production of fuels, pharmaceuticals or novel materials, and cell-free platforms that mimic cellular protein synthesis in vitro. By integrating orthogonal control elements such as small-molecule-responsive riboswitches and light-activated modules, synthetic biology offers finely tuned regulation of gene expression. The field is now extending beyond single-cell systems to multicellular consortia, programmable living materials and minimal synthetic cells, addressing challenges in medicine, diagnostics, sustainable manufacturing and environmental monitoring.

Research from Nature Portfolio

An ambient-temperature nucleic acid assay has been developed that combines target-splinted ligation of DNA probes with cell-free protein synthesis to generate enzymatic reporters. This instrument-free method achieves multiplexed detection of respiratory viral RNAs via lateral-flow strips, eliminating the need for thermal cycling or complex equipment and enabling point-of-care diagnostics.

An automated computational pipeline has converted protein-binding RNA aptamers into functional riboswitches operating in cell-free expression systems. Engineered sensors respond to human biomarkers—including C-reactive protein and interleukin-32γ—by regulating translation with up to 16-fold dynamic range, illustrating how in silico design enhances biosensor performance for low-cost diagnostics.

Building on genomically recoded bacteria lacking release factor 1, a cell-free protein synthesis platform was established that supports multisite incorporation of noncanonical amino acids. By functionally inactivating competing factors, extracts produce more than one gram per litre of model fluorescent protein, demonstrating a path to manufacture proteins with expanded chemical functionality.

Synthetic Biology publication trend

The graph below shows the total number of articles in synthetic biology across all publications each year (not limited to Nature Index journals).

Technical terms

Synthetic biology: The engineering discipline of designing organisms and gene networks with novel or improved functions using standardised biological parts.

Cell-free protein synthesis (CFPS): In vitro production of proteins using enzyme extracts or reconstituted translation machinery, independent of living cells.

Riboswitch: An RNA element that alters its conformation upon binding a specific ligand, thereby regulating gene expression at the transcriptional or translational level.

Photocaged nucleic acid: A DNA or RNA strand modified with light-sensitive chemical groups that block activity until removed by illumination at specific wavelengths.

Orthogonal: In synthetic biology, referring to components or systems that function independently of native cellular machinery and of each other.

References

1. Detection of viral RNAs at ambient temperature via reporter proteins produced through the target-splinted ligation of DNA probes. Nature Biomedical Engineering (2023).
2. Automated design of protein-binding riboswitches for sensing human biomarkers in a cell-free expression system. Nature Communications (2023).
3. Cell-free protein synthesis from genomically recoded bacteria enables multisite incorporation of noncanonical amino acids. Nature Communications (2018).
4. Precise, Orthogonal Remote-Control of Cell-Free Systems Using Photocaged Nucleic Acids. Journal of the American Chemical Society (2023).
5. High-throughput preparation methods of crude extract for robust cell-free protein synthesis. Scientific Reports (2015).
6. Microscale to manufacturing scale‐up of cell‐free cytokine production—a new approach for shortening protein production development timelines. Biotechnology and Bioengineering (2011).