Synthetic Biology Glossary

A pesticide derived from natural biological sources such as microorganisms, plant extracts, or genetic material, including engineered biological agents that control agricultural pests with reduced environmental impact compared to synthetic chemicals.

The community of microorganisms, including bacteria, fungi, viruses, and archaea, that inhabit a particular environment, and the emerging field of engineering these communities for applications in agriculture, human health, and industrial processes.

The biological or synthetic process of converting atmospheric nitrogen gas (N2) into ammonia or other reactive nitrogen compounds that can be assimilated by plants, a critical function for agriculture that synthetic biology aims to engineer into crop-associated microbes.

A natural biological process in which small RNA molecules silence gene expression by targeting messenger RNA for degradation, harnessed as a tool for gene function studies and as a therapeutic and agricultural technology.

A standardized, interchangeable biological part with defined prefix and suffix sequences that enable systematic assembly of genetic constructs, forming the basis of the Registry of Standard Biological Parts.

A functional unit of DNA that encodes a defined biological function, such as a promoter, ribosome binding site, coding sequence, or terminator, which can be combined with other parts to build genetic systems.

A series of enzyme-catalyzed biochemical reactions within a cell that convert precursor molecules into more complex products, which can be engineered to produce target compounds in host organisms.

A biological production method that uses cellular machinery extracted from cells, including ribosomes, enzymes, and energy systems, to synthesize proteins and other biomolecules without intact living cells.

A well-characterized host organism used as the foundation for synthetic biology engineering, selected for its genetic tractability, growth characteristics, and suitability for a particular application.

A method of protein engineering that mimics natural selection in the laboratory to evolve proteins or nucleic acids with desired properties through iterative rounds of mutagenesis, screening, and selection.

Methods for joining multiple DNA fragments together in a defined order to construct larger genetic constructs, pathways, or even entire genomes from synthesized or amplified components.

An engineered network of interacting genes and regulatory elements designed to perform a specific logical or computational function within a living cell, analogous to electronic circuits.

The direct manipulation of an organism's DNA using biotechnology tools to alter its genetic makeup, introducing, deleting, or modifying specific genes to achieve desired traits.

A synthetic gene circuit composed of two mutually repressive promoter-repressor pairs that creates a bistable system capable of switching between two stable states in response to external signals.

A set of technologies that enable precise modifications to an organism's DNA at specific locations in the genome, including insertions, deletions, and substitutions of genetic material.

The targeted modification of metabolic pathways within an organism to increase the production of a desired substance or to enable the biosynthesis of novel compounds.

The property of engineered biological components that function independently of each other and the host cell's native machinery, minimizing unintended cross-talk and enabling predictable system behavior.

The interdisciplinary field that applies engineering principles to biology, designing and constructing new biological parts, devices, and systems or redesigning existing natural biological systems for useful purposes.

A highly automated facility that integrates robotic liquid handling, high-throughput analytics, and computational design tools to accelerate the design-build-test-learn cycle for engineering biological systems.

An engineered vessel designed to support and control biological reactions by maintaining optimal conditions for cell growth and product formation, including temperature, pH, dissolved oxygen, and nutrient supply.

Contract Development and Manufacturing Organization, a company that provides process development, scale-up, and manufacturing services for biotechnology and pharmaceutical products on a contract basis.

Cost of Goods Sold, the total direct costs associated with producing a bio-manufactured product, including raw materials, fermentation operation, downstream processing, quality control, and packaging.

A fermentation operating mode in which fresh medium is continuously added to the bioreactor while spent culture is simultaneously removed, maintaining the culture in a steady state of growth and production.

The series of purification and processing steps that recover, isolate, and purify a target product from the fermentation broth after the biological production phase, often representing the majority of total manufacturing cost.

A fermentation operating mode in which nutrients are added incrementally to the bioreactor during the run without removing culture, enabling higher cell densities and product concentrations than batch operation.

The metabolic process by which microorganisms such as bacteria, yeast, and fungi convert substrates into desired products under controlled conditions, forming the production backbone of industrial biotechnology.

The use of genetically engineered microorganisms to produce specific proteins, fats, flavors, or other molecules through fermentation, enabling bio-identical production of compounds traditionally sourced from animals or plants.

The process of transitioning a fermentation or bioprocess from laboratory scale to pilot and commercial production volumes, requiring optimization of mass transfer, mixing, heat removal, and other parameters that change with vessel size.

The three key performance metrics for fermentation processes: titer (product concentration, g/L), rate (volumetric productivity, g/L/h), and yield (product per substrate consumed, g/g), which collectively determine production economics.

A precision genome editing technique that converts one DNA base pair to another at a specific genomic location without creating double-strand breaks, using a catalytically impaired Cas protein fused to a deaminase enzyme.

A family of CRISPR-associated endonucleases that recognize T-rich PAM sequences and create staggered double-strand breaks, offering complementary targeting capabilities to Cas9 and enabling novel diagnostic applications.

A CRISPR-associated ribonuclease that targets and cleaves single-stranded RNA rather than DNA, enabling programmable RNA knockdown, editing, and diagnostics without permanently altering the genome.

A genome editing system derived from bacterial adaptive immunity that uses the Cas9 endonuclease guided by a programmable RNA molecule to create targeted double-strand breaks in DNA.

A genetic engineering technology that biases inheritance to spread a particular gene or trait through a population at rates faster than normal Mendelian inheritance, potentially altering or suppressing entire wild populations.

A genetic engineering technique that inserts a specific DNA sequence at a defined genomic location, typically using homology-directed repair following a targeted double-strand break to integrate new genetic material precisely.

A genetic technique that renders a specific gene non-functional, typically by introducing insertions or deletions that disrupt the coding sequence, used to study gene function and engineer organisms with desired traits.

A short synthetic RNA molecule used in CRISPR systems that contains a sequence complementary to the target DNA site, directing the Cas nuclease to the precise genomic location for editing.

A high-fidelity DNA repair pathway that uses a homologous template sequence to accurately repair double-strand breaks, enabling precise gene editing when an exogenous donor template is provided.

A DNA repair pathway that directly ligates broken DNA ends without requiring a homologous template, often introducing small insertions or deletions at the repair site, making it the primary mechanism for CRISPR-mediated gene disruption.

Unintended modifications at genomic sites other than the intended target, caused by CRISPR or other genome editing tools recognizing and cleaving sequences with partial homology to the guide RNA.

Protospacer Adjacent Motif, a short DNA sequence adjacent to the target site that is required for Cas nuclease binding and cleavage, serving as a targeting constraint that varies between different CRISPR systems.

A versatile genome editing method that can install any type of point mutation, small insertions, or small deletions at target sites without requiring double-strand breaks or donor DNA templates, using a Cas9 nickase fused to a reverse transcriptase.

A deep learning system developed by DeepMind that predicts protein three-dimensional structures from amino acid sequences with near-experimental accuracy, fundamentally transforming structural biology and protein engineering.

The use of computational algorithms, physics-based modeling, and machine learning to engineer proteins with desired structures and functions by predicting the sequence-structure-function relationship in silico.

A protein designed entirely from scratch using computational methods, with sequences and structures not found in nature, created to perform specified functions or adopt targeted three-dimensional architectures.

The modification of enzyme properties such as activity, specificity, stability, and selectivity through directed evolution, rational design, or computational methods to optimize performance for industrial, therapeutic, or research applications.

The computational and experimental process of creating proteins with specified structures and functions, either by modifying existing proteins or designing entirely new sequences from scratch.

The physical process by which a polypeptide chain adopts its functional three-dimensional structure, and the computational challenge of predicting this structure from the amino acid sequence alone.

A deep learning model trained on large databases of protein sequences that learns the statistical patterns of amino acid usage and co-evolution, enabling prediction of protein structure, function, and the effects of mutations.

A protein engineering approach that uses structural and mechanistic knowledge of a protein to make targeted modifications predicted to achieve desired changes in function, stability, or other properties.

Adeno-Associated Virus, a small, non-pathogenic virus widely used as a delivery vehicle for gene therapy due to its ability to infect dividing and non-dividing cells with low immunogenicity and long-term transgene expression.

Chimeric Antigen Receptor T-cell therapy, in which a patient's T cells are genetically engineered to express a synthetic receptor that recognizes a specific protein on cancer cells, enabling targeted immune destruction of tumors.

A therapeutic approach in which living cells are engineered, expanded, or modified ex vivo and then administered to a patient to treat disease, encompassing CAR-T cells, engineered stem cells, and other cellular products.

A therapeutic approach that treats disease by introducing, altering, or replacing genetic material within a patient's cells, addressing the root genetic cause rather than managing symptoms.

A class of medicines that deliver synthetic messenger RNA molecules to cells, instructing them to produce specific therapeutic proteins, with applications spanning vaccines, protein replacement therapies, and gene editing delivery.