Synthetic biology

Synthetic biology, often called SynBio, is a multidisciplinary field of science. It focuses on the study and redesign of living systems and organisms. Scientists in this field apply engineering principles to biological components. They aim to develop new biological parts, devices, and systems. They also work to redesign existing systems found in nature. This field is not a single subject but a combination of many. It includes disciplines like biochemistry, molecular biology, and genetic engineering. It also draws from material science, biophysics, and even electrical engineering.

The mechanism of synthetic biology involves designing biological modules and machines. Researchers aim to produce predictable and robust systems with novel functionalities. These functionalities are often things that do not exist in nature. To achieve this, scientists use a method called systems design. This approach applies the engineering paradigm to biological systems. One theoretical idea involves using a molecular assembler. This would be a tool based on biomolecular systems like the ribosome.

By building from the ground up, scientists can create biological circuits. These circuits allow cells to process information or manipulate chemicals.

There are several distinct categories within this scientific field. Bioengineering is a major subfield that focuses on creating new metabolic and regulatory pathways. It differs from traditional genetic engineering, which usually only introduces a single transgene. Bioengineers use standardized parts to create entire signaling pathways. Synthetic genomics is another category that focuses on forming organisms with manufactured genomes. Scientists in this area aim to transplant complete genomes into living cells. This can reprogram a cell's metabolism to perform entirely new functions. Other categories include protocell synthetic biology, unconventional molecular biology, and in silico techniques.

The history of these ideas spans over a century. The term "synthetic biology" was first used by Stéphane Leduc in 1910. In 1944, Oswald Avery proved that DNA is the material of genes. Later, in 1953, Francis Crick and James Watson published the structure of DNA. A major turning point occurred in 1973 with the first molecular cloning of DNA. In 1988, the polymerase chain reaction, or PCR, was published by Mullis and others. This tool made it much easier to amplify and assemble DNA. In 2003, Tom Knight invented BioBrick plasmids, which are standardized DNA parts.

Significant milestones have shaped the modern era of the field. In 2010, researchers published the first synthetic bacterial genome, M. mycoides JCVI-syn1.0. In 2012, the discovery of CRISPR-Cas9 technology revolutionized gene editing. This allowed for much easier programming of DNA cleavage. In 2020, scientists created xenobots, which are programmable organisms made from frog cells. By 2021, researchers found that these xenobots could self-replicate by gathering loose cells. In 2019, scientists even reported a new form of viable life by reducing the number of codons in a bacterial genome. These numbers and breakthroughs show how rapidly the field is advancing.

The economic and practical significance of synthetic biology is growing. In 2016, more than 350 companies in 40 countries were active in the field. These companies had an estimated net worth of $3.9 billion in the global market. The field is expanding because DNA synthesis and sequencing costs are decreasing. Researchers are using nature's power to solve problems in agriculture and manufacturing. They are also working on ways to create enzymes that can decompose plastic. This helps address environmental issues using biological tools.

Finally, synthetic biology connects to many broader scientific and medical topics. One major connection is to RNA therapeutics, such as vaccines. RNA-based systems are often considered safer because they do not integrate into the host genome. They also act more rapidly than DNA systems because they do not require transcription. This technology is essential for personalized medicine and gene therapy. Synthetic biology also intersects with artificial intelligence. For example, the AlphaFold2 AI model helps predict the structures of millions of proteins. This helps researchers understand antibiotic resistance and other complex biological systems.