Modern biotechnology
The discovery that genes are made up of DNA and can be isolated, copied and manipulated has led to a new era of modern biotechnology. New Zealand has many applications for modern biotechnologies.
Blood samples for DNA profiling
Blood samples at the New Zealand DNA Profile Databank, for DNA profiling.
Humans have been manipulating living things for thousands of years. Examples of early biotechnologies include domesticating plants and animals and then selectively breeding them for specific characteristics. Find out more about ancient biotechnology.
Modern biotechnologies involve making useful products from whole organisms or parts of organisms, such as molecules, cells, tissues and organs. Recent developments in biotechnology include genetically modified plants and animals, cell therapies and nanotechnology. Some of these products are not in everyday use but may be of benefit to us in the future.
Applications in biotechnology
Key applications of biotechnology include:
DNA profiling – for further information see the article DNA profiling
DNA cloning – for further information see the article DNA cloning
transgenesis
genome analysis
gene silencing – for further information, see the article RNA interference
stem cells and tissue engineering – for further information see the article Stem cells
xenotransplantation – for further information see the article Xenotransplantation
protein crystallisation – for further information, see the article CubeSats, crystals and microgravity.
Meeting human needs and demands
Biotechnologies have an important role in meeting human needs and demands in medicine, agriculture, forensics, bioremediation, biocontrol and biosecurity.
Dog breeds
The selection of particular traits – or selective breeding – is how people have bred dogs for specific purposes. For example the 'sausage dog' – or dachshund were said to have been bred specifically for hunting badgers – their short, long body suited to entering badger holes.
Working dog breeds from The New Student’s Reference Work published in 1914.
Medicine
Gene modification or transgenesis are used to produce therapeutic human proteins in cells or whole organisms. The cell or organism used depends upon how large and complex the protein is. For example, human insulin, a small protein used to treat diabetes, is made in genetically engineered bacteria, whereas large, more complex proteins like hormones or antibodies are made in mammalian cells or transgenic animals.
Antibiotics and vaccines are products of microorganisms that are used to treat disease. Modern biotechnologies involve manipulating vaccines so they are more effective or can be delivered by different routes.
Gene therapy technologies are being developed to treat diseases like cancer, Parkinson’s disease and cystic fibrosis. In New Zealand, gene therapy is being used as a way to target and kill cancer cells with fewer side effects.
Xenotransplantation is the transplanting of cells, tissue or organs from one species into another. In New Zealand, cells from a unique, virus-free population of pigs are being used to treat people with type 1 diabetes. Find out more about this in the article Pig cell transplants.
For further information see the article, Xenotransplantation.
Piglets
Pigs are the current preferred donor species for Xenotransplantation.
Agriculture
Plants and animals can be improved by selectively breeding for particular traits or by genetic modification. Beneficial traits can be identified visually or by DNA profiling. For example, farmers may want plants with herbicide or insect resistance, tolerance to different growing environments or improved storage, or they may want livestock with better meat and wool or resistance to disease.
Explore the issues surrounding genetically modified foods.
Marker-assisted selection in apples
DNA markers can be used to determine whether a seedling carries an allele of interest. Here, the marker for the red-flesh allele is detected as an additional DNA band on an agarose gel. Breeders use information like this to decide which seedlings to grow and which to discard.
Forensics
DNA profiling is used in forensic analysis to identify DNA samples at a crime scene or to determine parentage.
For further information see the article, Forensics and DNA.
Bioremediation
Organisms or parts of organisms can be used to clean up pollution in soil, water or air. In New Zealand, bioremediation has been suggested as an effective way of removing the toxin DDT from the soil.
Lace bug
In 2009 the lace bug, Gargaphia decoris, was approved as a biocontrol agent for woolly nightshade in New Zealand. Woolly nightshade is an invasive weed that is well established in the North Island.
For further information see article, Public acceptance of bioremediation to address New Zealand’s DDT problem.
Biocontrol and biosecurity
Biocontrol is when one organism is used to control the levels of another. Biocontrol methods are being used in New Zealand to control invasive plants and insects. For further information, see the article, Biocontrol.
Biocontrol was also explored as an option to control numbers of possums in New Zealand. For further information, see the article, Biological control of possums.
Injecting nematode worms
Injecting the foreign DNA (the 'transgene') into the ovary of the female nematode worms requires a microscope.
Impacts of biotechnology on society
Biotechnologies use organisms or part of organisms to make a product to meet a specific human need. This raises social and ethical issues that are important to discuss. For further information, see the article, Impacts of biotechnology on society.
Novel biotechnologies – like RNA interference – may offer solutions to pest control. This article explores te ao Māori considerations around the use of these tools.
