Start a Business of Genetic Engineering
Genetic engineering, also called genetic modification, is the direct manipulation of an organism's genome using biotechnology. New DNA may be inserted in the host genome by first isolating and copying the genetic material of interest using molecular cloning methods to generate a DNA sequence, or by synthesizing the DNA, and then inserting this construct into the host organism. Genes may be removed, or "knocked out", using a nuclease. Gene targeting is a different technique that uses homologous recombination to change an endogenous gene, and can be used to delete a gene, remove exons, add a gene, or introduce point mutations.
Genetic engineering alters the genetic make-up of an organism using techniques that remove heritable material or that introduce DNA prepared outside the organism either directly into the host or into a cell that is then fused or hybridized with the host. This involves usingrecombinant nucleic acid (DNA or RNA) techniques to form new combinations of heritable genetic material followed by the incorporation of that material either indirectly through a vector system or directly through micro-injection, macro-injection and micro-encapsulationtechniques.
An organism that is generated through genetic engineering is considered to be a genetically modified organism (GMO). The first GMOs were bacteria in 1973 and GM mice were generated in 1974. Insulin-producing bacteria were commercialized in 1982 and genetically modified food has been sold since 1994. Glofish, the first GMO designed as a pet, was first sold in the United States December in 2003.
Genetic engineering techniques have been applied in numerous fields including research, agriculture, industrial biotechnology, and medicine. Enzymes used in laundry detergent and medicines such as insulin and human growth hormone are now manufactured in GM cells, experimental GM cell lines and GM animals such as mice or zebrafish are being used for research purposes, and genetically modified crops have been commercialized.
The first step is to choose and isolate the gene that will be inserted into the genetically modified organism. As of 2012, most commercialised GM plants have genes transferred into them that provide protection against insects or tolerance to herbicides. The gene can be isolated using restriction enzymes to cut DNA into fragments and gel electrophoresis to separate them out according to length. Polymerase chain reaction (PCR) can also be used to amplify up a gene segment, which can then be isolated through gel electrophoresis. If the chosen gene or the donor organism's genome has been well studied it may be present in a genetic library. If the DNA sequence is known, but no copies of the gene are available, it can be artificially synthesized.
The gene to be inserted into the genetically modified organism must be combined with other genetic elements in order for it to work properly. The gene can also be modified at this stage for better expression or effectiveness. As well as the gene to be inserted most constructs contain a promoter and terminator region as well as a selectable marker gene. The promoter region initiates transcription of the gene and can be used to control the location and level of gene expression, while the terminator region ends transcription. The selectable marker, which in most cases confers antibiotic resistance to the organism it is expressed in, is needed to determine which cells are transformed with the new gene. The constructs are made using recombinant DNA techniques, such as restriction digests, ligations and molecular cloning.The manipulation of the DNA generally occurs within a plasmid.
The most common form of genetic engineering involves inserting new genetic material randomly within the host genome. Other techniques allow new genetic material to be inserted at a specific location in the host genome or generate mutations at desired genomic loci capable of knocking out endogenous genes. The technique of gene targeting uses homologous recombination to target desired changes to a specific endogenous gene. This tends to occur at a relatively low frequency in plants and animals and generally requires the use of selectable markers. The frequency of gene targeting can be greatly enhanced with the use of engineered nucleases such as zinc finger nucleases,engineeredhoming endonucleases, or nucleases created from TAL effectors. In addition to enhancing gene targeting, engineered nucleases can also be used to introduce mutations at endogenous genes that generate a gene knockout.
Genetic engineering has applications in medicine, research, industry and agriculture and can be used on a wide range of plants, animals and micro organisms.
In medicine, genetic engineering has been used to mass-produce insulin, human growth hormones, follistim (for treating infertility), human albumin, monoclonal antibodies, antihemophilic factors, vaccines and many other drugs. Vaccination generally involves injecting weak, live, killed or inactivated forms of viruses or their toxins into the person being immunized. Genetically engineered viruses are being developed that can still confer immunity, but lack the infectious sequences.
Genetic engineering is an important tool for natural scientists. Genes and other genetic information from a wide range of organisms are transformed into bacteria for storage and modification, creating genetically modified bacteria in the process. Bacteria are cheap, easy to grow, clonal, multiply quickly, relatively easy to transform and can be stored at -80 °C almost indefinitely. Once a gene is isolated it can be stored inside the bacteria providing an unlimited supply for research
Using genetic engineering techniques one can transform microorganisms such as bacteria or yeast, or transform cells from multicellular organisms such as insects or mammals, with a gene coding for a useful protein, such as an enzyme, so that the transformed organism will overexpress the desired protein. One can manufacture mass quantities of the protein by growing the transformed organism in bioreactor equipment using techniques of industrial fermentation, and then purifying the protein.
One of the best-known and controversial applications of genetic engineering is the creation and use of genetically modified crops or genetically modified organisms, such as genetically modified fish, which are used to produce genetically modified food and materials with diverse uses.
Genetic Engineering Careers
Good genes aren't always a matter of luck. Sometimes, they're the work of genetic engineers. Genetic engineering, or the scientific altering of DNA, is a subspecialty of biomedical engineering. On top of diverse career options, genetic engineers enjoy above-average incomes and job opportunities. Genetic engineers earned a median annual income of $84,760 as of May 2011, according to the Bureau of Labor Statistics, with projected job growth of at least 29 percent from 2010 to 2020.
Genetic engineers who choose careers in human health focus on treatment of chronic illness. They developed genetically engineered insulin for diabetes patients in the 1980s, and have since created genetically engineered clot-busters to stop heart attacks, proteins and antibodies to fight cancer, vaccines for hepatitis B, hormones to halt anemia and antibodies to prevent organ rejections in transplant patients. Genetic engineers also turn otherwise harmful viruses or bacteria into messengers that carry therapeutic drugs to specific tissues. Genetic codes help them to uncover hereditary defects ranging from cystic fibrosis to hemophilia. Though many inherited conditions were not treatable as of 2012, genetic engineers are researching methods to fix faulty DNA codes. In the absence of treatments, genetic engineers report results of genetic testing to counselors who help patients prepare for potential diagnosis and treatment.
Genetic Engineering is Big Business
In 1980, the U.S. Supreme Court ruled that a genetically-altered micro-organism could be patented. With that door now open to profit, private genetic research soared.
Most people think positively about the advancements in biotechnology in areas like medicine, which is indeed a big part of the industry. Leading geneticists are hot on the trail to eradicating cancer and the latest in cloning has successfully grown body parts like the human ear. What this means for vital organ transplants is extraordinary.
As we step into 2010, biotechnology is common practice in a many of today’s industries.
Bio-fuels, based on plants like corn or animal by-products, are supplementing and, can actually replace, our dependence on oil and natural gas.
Gene therapy involves the replacement or repair of defective genes and may lead to a cure for cancer and many other diseases. Bio-identical hormones are helping women navigate through menopause and are in the lead for that fountain of youth formula we all hope for.
Genetic Engineering from a Laptop
Genetic Engineering Institutions
List of Ten Excellent Genetic Engineering Schools
|Arizona State University||Students in the School of Biological and Health Systems Engineering have access to 21 distinct labs.||Tempe, AZ|
|Ohio State University-Main Campus||Students can attend events such as an Engineering Career Success Conference and an Engineering EXPO.||Columbus, OH|
|Pennsylvania State University-Main Campus||Students can participate in outreach services through the Biomedical Engineering Society and research opportunities in the field.||University Park, PA|
|Purdue University-Main Campus||Purdue tied for 8th place on U.S. News & World Report's 2014 list of best engineering schools.||West Lafayette, IN|
|University of California-Los Angeles||Bioengineering faculty have been recognized by publications and organizations such as Popular Science Magazine and the National Institute of Health.||Los Angeles, CA|
|University of Illinois at Urbana-Champaign||The university's Department of Bioengineering recently received $100 million from the Grainger Engineering Breakthroughs Initiative.||Champaign, IL|
|University of Michigan-Ann Arbor||Along with Purdue, U-M tied for 8th place on U.S. News & World Report's 2014 list of best engineering schools.||Ann Arbor, MI|
|University of Minnesota-Twin Cities||The engineering school offers students access to a nearby medical school, as well as 300 medical device companies in the area.||Minneapolis, MN|
|University of Texas at Austin||On its 2014 list of best engineering schools, U.S. News & World Report ranked UT-Austin in tenth place.||Austin, TX|
|University of Washington-Seattle Campus||The university tied for seventh-place ranking on U.S. News & World Report's 2014 list of best schools offering graduate programs in bioengineering.||Seattle, WA|
For More details: http://agbiosafety.unl.edu/basic_genetics.shtml