Synthetic biology is an interdisciplinary branch of biology and engineering. The subject combines various disciplines from within these domains, such as biotechnology, evolutionary biology, molecular biology, systems biology, biophysics, computer engineering, and genetic engineering.
Descriptions of synthetic biology depend on how you approach it, as a biologist or as an engineer. Originally seen as a subset of biology, in recent years the role of engineering has become more important. For example, one description sees synthetic biology as "an emerging discipline that uses engineering principles to design and assemble biological components". Another description, by Jan Staman Director of the Rathenau Institute in The Hague in 2006, saw it as "a new emerging scientific field where ICT, biotechnology and nanotechnology meet and strengthen each other".
The definition of synthetic biology is debated not only among natural scientists and engineers but also in the human sciences, arts and politics. One popular definition is "designing and constructing biological devices, biological systems, and biological machines for useful purposes." However, the functional aspects of this definition stem from molecular biology and biotechnology.
Synthetic biology has been recently defined as the artificial design and engineering of biological systems and living organisms for purposes of improving applications for industry or biological research as it has expanded to many interdisciplinary fields.
- 1 History
- 2 Perspectives
- 3 Automated (DNA) construction and standards of abstraction
- 4 Key enabling technologies
- 5 Research examples
- 6 Applications
- 7 Bioethics and security
- 8 See also
- 9 References
- 10 External links
The first of the term "synthetic biology" was in Stéphane Leduc’s publication of « Théorie physico-chimique de la vie et générations spontanées » (1910) and « La Biologie Synthétique » (1912).[who said this?]
Let me now comment on the question "what next". Up to now we are working on the descriptive phase of molecular biology. … But the real challenge will start when we enter the synthetic phase of research in our field. We will then devise new control elements and add these new modules to the existing genomes or build up wholly new genomes. This would be a field with an unlimited expansion potential and hardly any limitations to building "new better control circuits" or ..... finally other "synthetic" organisms, like a "new better mouse". … I am not concerned that we will run out of exciting and novel ideas, … in the synthetic biology, in general.
When in 1978 the Nobel Prize in Physiology or Medicine was awarded to Arber, Nathans and Smith for the discovery of restriction enzymes, Wacław Szybalski wrote in an editorial comment in the journal Gene:
The work on restriction nucleases not only permits us easily to construct recombinant DNA molecules and to analyze individual genes, but also has led us into the new era of synthetic biology where not only existing genes are described and analyzed but also new gene arrangements can be constructed and evaluated.
The first applications of synthetic biology occurred in 2000, when two articles in Nature discussed the creation of the now frequently used biological circuit devices of a genetic toggle switch and a biological clock by combining genes within E. coli cells.
Engineers view biology as a technology – the systems biotechnology or systems biological engineering. Synthetic biology includes the broad redefinition and expansion of biotechnology, with the ultimate goals of being able to design and build engineered biological systems that process information, manipulate chemicals, fabricate materials and structures, produce energy, provide food, and maintain and enhance human health (see Biomedical Engineering) and our environment.
Studies in synthetic biology can be subdivided into broad classifications according to the approach they take to the problem at hand: standardization of biological parts, biomolecular engineering, genome engineering. Biomolecular engineering includes approaches which aim to create a toolkit of functional units that can be introduced to present new orthogonal functions in living cells. Genetic engineering includes approaches to construct synthetic chromosomes for whole or minimal organisms. Biomolecular design refers to the general idea of the de novo design and combination of biomolecular components. The task of each of these approaches is similar: to create a more synthetic entry at a higher level of complexity by manipulating a part of the preceding level.
Re-writers are synthetic biologists interested in testing the notion that, due to the complexity of natural biological systems, it would be simpler to re-build the natural systems of interest, from the ground up, in order to provide engineered surrogates that are easier to understand and interact with. Re-writers draw inspiration from refactoring, a process sometimes used to improve computer software.
Automated (DNA) construction and standards of abstraction
Abstraction is the process of generalization by reducing the information content of a concept or an observable phenomenon, typically in order to retain only information which is relevant for a particular purpose. It is a mechanism and practice to reduce and factor out details so that one may focus on a few concepts at a time. For example, abstracting "a well-worn, bouncy basketball" to simply "a ball" retains only the information on the attributes and behavior of a general ball. Similarly, abstracting an emotional state to "happiness" or "sadness" reduces the amount of information conveyed about the emotional state. However, these abstractions allow hiding complexity, and using more parts in a simpler design.
In synthetic biology, genetic code is abstracted into chunks, known primarily as biological "parts". These parts allow us to build increasingly complex systems; putting several parts together creates a "device", which is regulated by start codons, stop codons, restriction sites, and similar coding regions known as "features".
Key enabling technologies
Several key enabling technologies are critical to the growth of synthetic biology. The key concepts include standardization of biological parts and hierarchical abstraction to permit using those parts in increasingly complex synthetic systems. Achieving this is greatly aided by basic technologies of reading and writing of DNA (sequencing and fabrication), which are improving in price/performance exponentially (Kurzweil 2001). Measurements under a variety of conditions are needed for accurate modeling and computer-aided-design (CAD).
Standardized DNA parts
The most used:22–23 standardized DNA parts are BioBrick plasmids invented by Tom Knight in 2003. Biobricks are stored at the Registry of Standard Biological Parts in Cambridge, Massachusetts and the BioBrick standard has been used by thousands of students worldwide in the international Genetically Engineered Machine (iGEM) competition.:22–23
In 2007 it was reported that several companies were offering the synthesis of genetic sequences up to 2000 bp long, for a price of about $1 per base pair and a turnaround time of less than two weeks. Oligonucleotides harvested from a photolithographic or inkjet manufactured DNA chip combined with DNA mismatch error-correction allows inexpensive large-scale changes of codons in genetic systems to improve gene expression or incorporate novel amino-acids (see George M. Church's and Anthony Forster's synthetic cell projects.) This favors a synthesis-from-scratch approach.
Additionally, the CRISPR/Cas system has emerged as a promising technique for gene editing. It was hailed by The Washington Post as "the most important innovation in the synthetic biology space in nearly 30 years." While other methods take months or years to edit gene sequences, CRISPR speeds that time up to weeks. However, due to its ease of use and accessibility, it has raised a number of ethical concerns, especially surrounding its use in the biohacking space.
DNA sequencing is determining the order of the nucleotide bases in a molecule of DNA. Synthetic biologists make use of DNA sequencing in their work in several ways. First, large-scale genome sequencing efforts continue to provide a wealth of information on naturally occurring organisms. This information provides a rich substrate from which synthetic biologists can construct parts and devices. Second, synthetic biologists use sequencing to verify that they fabricated their engineered system as intended. Third, fast, cheap and reliable sequencing can also facilitate rapid detection and identification of synthetic systems and organisms.
Models inform the design of engineered biological systems by allowing synthetic biologists to better predict system behavior prior to fabrication. Synthetic biology will benefit from better models of how biological molecules bind substrates and catalyze reactions, how DNA encodes the information needed to specify the cell and how multi-component integrated systems behave. Recently, multiscale models of gene regulatory networks have been developed that focus on synthetic biology applications. Simulations have been used that model all biomolecular interactions in transcription, translation, regulation, and induction of gene regulatory networks, guiding the design of synthetic systems.
Driven by dramatic decreases in costs of making oligonucleotides ("oligos"), the sizes of DNA constructions from oligos have increased to the genomic level. For example, in 2000, researchers at Washington University reported synthesis of the 9.6 kbp (kilo base pair) Hepatitis C virus genome from chemically synthesized 60 to 80-mers. In 2002 researchers at SUNY Stony Brook succeeded in synthesizing the 7741 base poliovirus genome from its published sequence, producing the second synthetic genome. This took about two years of work. In 2003 the 5386 bp genome of the bacteriophage Phi X 174 was assembled in about two weeks. In 2006, the same team, at the J. Craig Venter Institute, had constructed and patented a synthetic genome of a novel minimal bacterium, Mycoplasma laboratorium and were working on getting it functioning in a living cell.
Synthetic transcription factors
Studies have also been performed on the components of the DNA translation mechanism. One desire of scientists creating synthetic biological circuits is to be able to control the translation of synthetic DNA in prokaryotes and eukaryotes. One study tested the adjustability of synthetic transcription factors (sTFs) in areas of transcription output and cooperative ability among multiple transcription factor complexes. Researchers were able to mutate zinc fingers, the DNA specific component of sTFs, to decrease their affinity for DNA, and thus decreasing the amount of translation. They were also able to use the zinc fingers as components of complex forming sTFs, which are the eukaryotic translation mechanisms.
One important topic in synthetic biology is synthetic life, that is, artificial life created in vitro from biomolecules and their component materials. Synthetic life experiments attempt to either probe the origins of life, study some of the properties of life, or more ambitiously to recreate life from non-living (abiotic) components. Synthetic biology attempts to create new biological molecules and even novel living species capable of carrying out a range of important medical and industrial functions, from manufacturing pharmaceuticals to detoxifying polluted land and water. In medicine, it offers prospects of using designer biological parts as a starting point for an entirely new class of therapies and diagnostic tools.
In the area of synthetic biology, a living "artificial cell" has been defined as a completely synthetically-made cell that can capture energy, maintain ion gradients, contain macromolecules as well as store information and have the ability to mutate. A completely synthetic genome was produced by Craig Venter, and his team introduced it to genomically emptied bacterial host cells, and allowed the host cells to grow and replicate. The first living organism with 'artificial' DNA was produced by scientists after 15 years at the Scripps Research Institute as E. coli was engineered to replicate an expanded genetic alphabet.
Currently, entire organisms are not being created from scratch, but instead living cells are being transformed with inserts of new DNA. There are several ways of constructing synthetic DNA components and even entire synthetic genomes, but once the desired genetic code is obtained, it is integrated into a living cell that is expected to manifest the desired new capabilities or phenotypes while growing and thriving. Cell transformation is used to create biological circuits, which can be manipulated to yield desired outputs.
Scientists can encode vast amounts of digital information onto a single strand of synthetic DNA. In 2012, George M. Church encoded one of his books about synthetic biology in DNA. The 5.3 Mb of data from the book is more than 1000 times greater than the previous largest amount of information to be stored in synthesized DNA. A similar project had encoded the complete sonnets of William Shakespeare in DNA.
Synthetic genetic pathways
Traditional metabolic engineering has been bolstered by the introduction of combinations of foreign genes and optimization by directed evolution. Perhaps the best known application of synthetic biology to date is engineering E. coli and yeast for commercial production of a precursor of the antimalarial drug, Artemisinin, by the laboratory of Jay Keasling.
Many technologies have been developed for incorporating unnatural nucleotides and amino acids into nucleic acids and proteins, both in vitro and in vivo. For example, in May 2014, researchers announced that they had successfully introduced two new artificial nucleotides into bacterial DNA, and by including individual artificial nucleotides in the culture media, were able to passage the bacteria 24 times; they did not create mRNA or proteins able to use the artificial nucleotides.
Unnatural amino acids
Another common topic of investigation is expansion of the normal repertoire of 20 amino acids. Excluding stop codons, there are 61 codons, but only 20 amino acids are coded in virtually all organisms. Certain codons are engineered to code for an alternative amino acid, including nonstandard (such as O-methyl tyrosine) or exogenous (such as 4-fluorophenylalanine) amino acids. Typically, these projects make use of re-coded nonsense suppressor tRNA-Aminoacyl tRNA synthetase pairs from other organisms, though in most cases substantial engineering is still required.
Reduced amino-acid libraries
Instead of expanding the genetic code, other researchers have investigated the structure and function of proteins by reducing the normal set of 20 amino acids, that is, by generating proteins where certain groups of amino acids may be substituted with a single amino acid. For instance, several non-polar amino acids within a protein may all be replaced with a single non-polar amino acid. One project demonstrated that an engineered version of Chorismate mutase still had catalytic activity when only 9 amino acids were used.
While there are methods to engineer natural proteins (such as by Directed evolution), there are also projects to design novel protein structures that match or improve on the functionality of existing proteins. One group generated a helix bundle that was capable of binding oxygen with similar properties as hemoglobin, yet did not bind carbon monoxide. A similar protein structure was generated to support a variety of oxidoreductase activities. Another group generated a family of G-protein coupled receptors which could be activated by the inert small molecule clozapine-N-oxide but insensitive to the native ligand (acetylcholine)
A biosensor refers to an engineered organism (usually a bacterium) that is capable of reporting some environmental phenomenon, such the presence of heavy metals or toxins. In this respect, a very widely used system is the Lux operon of Aliivibrio fischeri. The Lux operon consists of five genes which are necessary and sufficient for bacterial bioluminescence, and can be placed under an alternate promoter to express the genes in response to an arbitrary environmental stimulus. One such sensor created in Oak Ridge National Laboratory and named "critter on a chip" used a coating of bioluminescent bacteria on a light sensitive computer chip to detect certain petroleum pollutants. When the bacteria sense the pollutant, they begin to generate light.
By integrating synthetic biology approaches with materials sciences, it would be possible to envision cells as microscopic molecular foundries to produce materials with properties that can be genetically encoded. Recent advances towards this include reengineering curli fibers, the amyloid component of extracellular material of biofilms, as a platform for a programmable nanomaterial. These nanofibers have been genetically programmed for specific functions, including adhesion to substrates, nanoparticle templating, and protein immobilization.
Researchers and companies utilizing synthetic biology aim to synthesize enzymes with high activity, to produce products with optimal yields and effectiveness. These synthesized enzymes aim to improve products such as detergents and lactose-free dairy products, as well as make them more cost effective.
The improvements of metabolic engineering by synthetic biology is an example of a biotechnological technique utilized in industry to discover pharmaceuticals and fermentative chemicals. Synthetic biology may investigate modular pathway systems in biochemical production and increase yields of metabolic production. Artificial enzymatic activity and subsequent effects on metabolic reaction rates and yields may develop “efficient new strategies for improving cellular properties . . . for industrially important biochemical production."
Synthetic biology raised NASA’s interest as it could help to produce resources for astronauts from a restricted portfolio of compounds sent from Earth. On Mars, in particular, synthetic biology could also lead to production processes based on local resources, making it a powerful tool in the development of manned outposts with minimal dependence on Earth.
Bioethics and security
In addition to numerous scientific and technical challenges, synthetic biology raises ethical issues and biosecurity issues. However, with the exception of regulating DNA synthesis companies, the issues are not seen as new because they were raised during the earlier recombinant DNA and genetically modified organism (GMO) debates and there were already extensive regulations of genetic engineering and pathogen research in place in the U.S.A., Europe and the rest of the world.
The European Union funded project SYNBIOSAFE has issued several reports on how to manage the risks of synthetic biology. A 2007 paper identified key issues in safety, security, ethics and the science-society interface, which the project defined as public education and ongoing dialogue among scientists, businesses, government, and ethicists). The key security issues that SYNBIOSAFE identified involved engaging companies that sell synthetic DNA and the Biohacking community of amateur biologists. Key ethical issues concerned the creation of new life forms.
A subsequent report focused on biosecurity, especially the so-called dual-use challenge. For example, while synthetic biology may lead to more efficient production of medical treatments, for malaria for example(see artemisinin), it may also lead to synthesis or redesign of harmful pathogens (e.g., smallpox). The bio-hacking community remains a source of special concern, as the distributed and diffuse nature of open-source biotechnology makes it difficult to track, regulate, or mitigate potential concerns over biosafety and biosecurity.
COSY, another European initiative, focuses on public perception and communication of synthetic biology. To better communicate synthetic biology and its societal ramifications to a broader public, COSY and SYNBIOSAFE published a 38-minute documentary film in October 2009.
The International Association Synthetic Biology has proposed an initiative for self-regulation. This suggests specific measures that the synthetic biology industry, especially DNA synthesis companies, should implement. In 2007, a group led by scientists from leading DNA-synthesis companies published a "practical plan for developing an effective oversight framework for the DNA-synthesis industry."
In January 2009, the Alfred P. Sloan Foundation funded the Woodrow Wilson Center, the Hastings Center, and the J. Craig Venter Institute to examine the public perception, ethics, and policy implications of synthetic biology.
On July 9–10, 2009, the National Academies' Committee of Science, Technology & Law convened a symposium on "Opportunities and Challenges in the Emerging Field of Synthetic Biology".
After the publication of the first synthetic genome by Craig Venter's group and the accompanying media coverage about "life" being created, President Obama requested the Presidential Commission for the Study of Bioethical Issues to study synthetic biology. The commission convened a series of meetings, then issued a report in December 2010 titled "New Directions: The Ethics of Synthetic Biology and Emerging Technologies." The commission clarified that the "while Venter’s achievement marked a significant technical advance in demonstrating that a relatively large genome could be accurately synthesized and substituted for another, it did not amount to the “creation of life”. It also noted that synthetic biology is an emerging field, which creates potential risks and rewards. The commission did not recommend any changes to policy or oversight and called for continued funding of the research and new funding for monitoring, study of emerging ethical issues, and public education.
Synthetic biology, being a major tool for biological advances, results in the “potential for developing biological weapons, possible unforeseen negative impacts on human health . . . and any potential environmental impact." These security issues may be avoided by regulating industry uses of biotechnology through policy legislation. Federal guidelines on genetic manipulation are being proposed by “the President’s Bioethics Commission . . . in response to the announced creation of a self-replicating cell from a chemically synthesized genome, put forward 18 recommendations not only for regulating the science . . . for educating the public.”
Opposition to synthetic biology
On March 13, 2012, over 100 environmental and civil society groups, including Friends of the Earth, the International Center for Technology Assessment and the ETC Group issued the manifesto The Principles for the Oversight of Synthetic Biology. This manifesto calls for a worldwide moratorium on the release and commercial use of synthetic organisms until more robust regulations and rigorous biosafety measures are established. The groups specifically call for an outright ban on the use of synthetic biology on the human genome or human microbiome. Richard Lewontin wrote that some of the safety tenets for oversight discussed in The Principles for the Oversight of Synthetic Biology are reasonable, but that the main problem with the recommendations in the manifesto is that "the public at large lacks the ability to enforce any meaningful realization of those recommendations."
Synthetic biology brings to light a number of questions, including: who will have control and access to the products of synthetic biology, and who will gain from these innovations? Placing patents on living organisms and regulations on bioengineering of human embryos are large concerns in the bioethics field.
- Carlson Curve
- Computational biology
- Computational biomodeling
- DNA digital data storage
- Expanded genetic code
- Genetically modified organism
- International Genetically Engineered Machine
- Non-cellular life
- Registry of Standard Biological Parts
- Regenerative medicine
- Synthetic biological circuit
- Systems biology
- Synthetic genomics
- Synthetic intelligence
- Synthetic morphology
- Systems and Synthetic Biology journal
- Tissue engineering
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- syntheticbiology.org the original community website
- Synthetic biology books recent popular science book and textbooks
- Biobuilder.org an educational website to engage and inform a wider audience of synthetic biology enthusiasts
- Synthetic Biology Engineering Research Center (SynBERC) A NSF-funded multi-university effort to lay the foundations for synthetic biology.
- BioBricks Foundation president Drew Endy; organization related to iGEM
- The (World) Associates for Biosystem Science and Engineering (WABSE)
- Synthetic Biology Project Synthetic biology news, events, publications and more.
- International Association Synthetic Biology
- Synbiosafe European project to research the safety and ethical aspects of synthetic biology.
- Introductory Summary of Synthetic Biology. Concise overview of synthetic biology concepts, developments and applications
- Collaborative overview article on Synthetic Biology
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