What Is Biotechnology?

Biotechnology is a field of applied science concerned with using living organisms, cells, or biological molecules to develop products, processes, and services that address human needs in medicine, agriculture, industry, and environmental management. The term broadly encompasses any technology that exploits biological systems, from ancient fermentation practices used to produce beer and bread, to recombinant DNA techniques that produce insulin in engineered bacteria, to cell therapies that use a patient's own immune cells to fight cancer. The common thread is the deliberate manipulation or application of biological processes toward defined practical ends.

The modern era of biotechnology began in 1973, when Stanley Cohen and Herbert Boyer demonstrated that DNA segments from one organism could be cut, joined to a plasmid vector, and introduced into bacterial cells, where the foreign genes were expressed. This recombinant DNA technology gave scientists the tools to produce any protein of interest in a scalable biological system, and it remains foundational to the pharmaceutical, agricultural, and industrial biotechnology sectors.

Genetic Engineering

Genetic engineering is the deliberate modification of an organism's genome using molecular tools to alter its traits or produce specific molecules. Early techniques relied on restriction endonucleases and DNA ligases to cut and join defined DNA fragments; later, polymerase chain reaction (PCR) enabled rapid amplification and manipulation of specific sequences. The introduction of CRISPR-Cas9 genome editing in the 2010s substantially accelerated the field by allowing precise, programmable cuts at any genomic location with a short RNA guide sequence. CRISPR-based tools are now used to develop crop varieties with improved yield or drought tolerance, to engineer industrial microorganisms that produce chemicals and biofuels, and to investigate therapeutic gene corrections for inherited diseases. An introduction to biotechnology published in PMC covers the progression from early recombinant DNA techniques through contemporary genome editing platforms.

Medical Biotechnology

Medical biotechnology applies genetic engineering, cell biology, and molecular diagnostics to develop drugs, diagnostics, and cell-based therapies. Recombinant proteins such as insulin, erythropoietin, human growth hormone, and monoclonal antibodies are produced by engineering mammalian, yeast, or bacterial expression systems and are among the highest-revenue pharmaceutical products globally. Monoclonal antibody therapies target cancer antigens, autoimmune mediators, and infectious disease agents with a specificity that small-molecule drugs cannot achieve. Vaccines produced through biotechnology, including subunit vaccines, recombinant viral vectors, and mRNA vaccines, have reshaped the response to infectious disease outbreaks. Personalized medicine initiatives use genomic sequencing to identify mutations that predict disease risk or guide therapeutic selection. The applications of industrial biotechnology overview from West Los Angeles College's open biotechnology textbook surveys the progression from fermentation-based antibiotic production to contemporary recombinant protein therapeutics.

Industrial and Agricultural Biotechnology

Industrial biotechnology, sometimes called white biotechnology, uses microorganisms and enzymes as biocatalysts to produce chemicals, materials, and fuels from renewable feedstocks, replacing petroleum-dependent processes. Fermentation-derived bioplastics such as polylactic acid (PLA) and polyhydroxyalkanoates (PHAs), as well as bio-based solvents and specialty chemicals, are manufactured at industrial scale. Agricultural biotechnology produces transgenic crops engineered for herbicide tolerance, insect resistance, or enhanced nutritional content, and applies tissue culture techniques for rapid propagation of disease-free planting stock. The Biotechnology and Food Science program at NTNU describes how biotechnology bridges fundamental biological science and the engineering disciplines required to implement it at industrial scale. Bioremediation, which uses microorganisms to degrade environmental contaminants such as petroleum hydrocarbons, chlorinated solvents, and heavy metals, is a further application in the environmental sector.

Applications

Biotechnology has applications in a range of fields, including:

• Human health: therapeutic proteins, gene therapies, vaccines, and companion diagnostics
• Agriculture: herbicide-tolerant and insect-resistant crop varieties, biopesticides
• Industrial chemistry: enzymatic synthesis of fine chemicals and bio-based polymers
• Environmental management: bioremediation of contaminated soil and water
• Food production: fermented products, starter cultures, and food enzymes