Without the significant works of Miescher, Astbury, Hershey, Chase, Avery, Macleod, McCarty, Crick, Watson, Khorana, Holley, and Nirenburg, DNA could never be the powerful tool it is today. These people led the way to modern DNA analysis. As DNA was identified as a container of genetic information, nowadays, it is used to identify, screen, detect, develop, prevent, and treat. In short, it has furthered science significantly. In today’s day and age, DNA analysis and the information gathered from it is routinely used in forensic investigations, the field of biosecurity, postal services, environment and food testing, biochemical engineering, the study of climate change, and medicine. Criminals are linked to crime scenes via DNA analysis, and so are paternities determined, and victims of mass disasters such as 9/11 and hurricanes identified. Genetic analysis, which is only possible because the structure of DNA and the knowledge that DNA contains genetic information is known, allows public health agencies to identify infectious diseases in a quick manner, thus monitoring the threats. The U.S. postal service frequently uses DNA analysis to examine packages for forms of bioterrorism (e.g. anthrax). On a similar note, the presence of food and health threatening microorganisms such as E. coli and genetically modified organisms can be detected via DNA analysis. It is also used to predict and better the future of the Earth and its climate, and human healthcare:
Information gleaned from the characterization of complete microbial genomes is now being applied to develop alternative sources of energy and understand biological carbon cycling as it relates to global climate change. In the emerging era of personalized medicine, DNA analysis is already helping researchers and physicians to better understand disease predisposition, subtypes, and response to treatment. Several targeted medicines are already available, which are designed to work for patient exhibiting a specific DNA profile. Like the fingerprints that came into use by detectives and police labs during the 1930s, each person has a unique DNA fingerprint. Unlike a conventional fingerprint that occurs only on the fingertips and can be altered by surgery, a DNA fingerprint is the same for every cell, tissue, and organ of a person. It cannot be altered by any known treatment. Consequently, DNA fingerprinting is rapidly becoming the primary method for identifying and distinguishing among individual human beings. An additional application of DNA fingerprint technology is the diagnosis of inherited disorders in adults, children, and unborn babies. The technology is so powerful that, for example, even the blood-stained clothing of Abraham Lincoln could be analyzed for evidence of a genetic disorder called Marfan's Syndrome.
As mentioned in this passage, DNA fingerprinting is the most utile advances in microbiological technology today. It is a laboratory procedure that uses DNA-modifying enzymes, such as nucleases and ligases. Nucleases are enzymes that cut DNA strands by catalyzing the hydrolysis of the phosphate-ester bonds. The most frequently used nucleases are the restriction endonucleases, which cut DNA at specific sequences. Naturally, these enzymes prevent phage infection in bacteria by digesting the phage upon entry. In science, they are used in molecular cloning and DNA fingerprinting. Ligases carry out the opposite functions; they reform cut or broken DNA strands. They are used to join together short segments of DNA to replicate a complete copy in DNA repair and genetic recombination. DNA fingerprinting requires five steps:
- Isolating the DNA; only a small amount of tissue is needed.
- Cutting, sizing, and sorting the DNA via nucleases (EcoR1); the DNA pieces are then sorted according to size by a sieving technique called electrophoresis and passed through agarose (seaweed gel).
- Transferring the DNA to nylon; the nylon sheet is placed on the gel and soaked overnight.
- Probing; placing radioactive probes to the nylon sheet makes a pattern which is the DNA fingerprint; each probe usually sticks in only a couple of specific places on the nylon sheet.
- DNA Fingerprint; it is built with approximately 5 to 10 probes at the same time; looks like bar codes.
This process of DNA fingerprinting is globally used to diagnose inherited syndromes and disorders in both fetuses and newborn babies such as cystic fibrosis, hemophilia, Huntington’s disease, Alzheimer’s, sickle cell anemia, etc. When such disorders are detected early, it proves beneficial for both the hospital staff and the family of the diseased:
In some programs, genetic counselors use DNA fingerprint information to help prospective parents understand the risk of having an affected child. In other programs, prospective parents use DNA fingerprint information in their decisions concerning affected pregnancies. Research programs to locate inherited disorders on the chromosomes depend on the information contained in DNA fingerprints. By studying the DNA fingerprints of relatives who have a history of some particular disorder, or by comparing large groups of people with and without the disorder, it is possible to identify DNA patterns associated with the disease in question. This work is a necessary first step in designing an eventual genetic cure for these disorders.
This passage elucidates that DNA fingerprinting plays a vital role in today’s society, where the necessity of population remains a question. Additionally, DNA fingerprinting is used in the justice system, as FBI and police labs use DNA fingerprints to determine whether suspects are linked to the biological evidence (hair, blood, semen, clothing items) found at a crime scene. Also, DNA fingerprints are used as perfectly accurate pieces of evidence to establish blood relations in custody and child support cases. Finally, the US armed services have just started a program to collect DNA fingerprints from all their personnel for later use in the case of casualties or missing persons; a far better identification source that dog tags or dental records. To sum it up, DNA has furthered and better science to a great extent in today’s society yet it could not have done so without the foundation of discovery that previous scientists such as Crick and Watson left behind.
Since DNA can be used to such an extent in the present, it is safe to deduce that it will play an even more significant role in the future. According to Mark Stevenson, executive vice-president for Applied Biosystems:
Science is entering a new era, in which recent technological developments have created 'power tools' that will enable even more rapid progress in delivering on the promise of genomics to help protect and preserve human health and safety, as well as our environment. The promise of next-generation DNA sequencing technology is to broaden the applications of genomic information in medical research and health care, reduce the cost of sequencing without sacrificing quality, and enable discoveries that are expected to revolutionize the practice of medicine.
In other words, new tools that use DNA will allow further advances in connecting genes and genetic variations with the appropriate diseases and responses to treatment. Thus, new therapies and the hope for cures will develop by using information from the genetic bases of disorders such as cancer, Alzheimer’s, and diabetes. A new DNA test uses saliva to determine whether a person is liable to develop a dangerous disease; this can evolve into a speedy and economic test determining whether a person will inherit a hereditary illness. If all goes according to plan, one drop of saliva will be enough to enable medical experts to “pinpoint variations in patients’ genetic code is a test being formulated by scientists at Edinburgh University. Tiny differences or omissions at critical points in the DNA chain can determine whether a person is healthy, prone to disease, or has a life-threatening condition such as cystic fibrosis”. According to Professors Juan Diaz and Mark Bradley of Edinburgh University:
This technology offers a speedy, cost-efficient alternative to existing methods of DNA analysis. The market for DNA testing is quickly expanding as it becomes more affordable. Our method could help reach the goal of complete genome (order of genes in a set of chromosomes) analysis in a few hours for less than $1,000 (£637). We plan to test the technology further, extend our collaborations with leading researchers and companies in the DNA sequencing field, and establish our first commercial operations within the next six months.
This quote proves that DNA will indeed come to better uses in the immediate future as it will aid the prevention of hereditary or other dangerous disorders/diseases. In my opinion, even though one’s vision clouds when predicting the further future, it is safe to say that DNA will still come to good use, one that benefits the justice, social, and medical systems. In the long run, the usage of DNA in technology will benefit society at large. For example, today, DNA is used to stem the tide of human trafficking, as on the 26th and 27th of October, 2009, experts in genetic identification from Brazil, China, Guatemala, India, Indonesia, Mexico, Nepal, the Philippines, Spain, Sri Lanka, Thailand, the UAE, the US, and the UNODC met in Granada, Spain to hold the DNA – Prokids Scientific Group Meeting, an organization that has agreed to a series of commitments to foster international partnerships for joint action against human trafficking. They work towards obtaining DNA samples from kids found outside their families; victims of prostitution, forced labor, militants activities, and illegal adoption, and creating DNA profiles to store in an international database where they can be searched against the DNA profiles provided by families who have their children kidnapped or lost. In the long run, this movement will help reduce the global crime of human trafficking, and thus improve safety. Therefore, it can be concluded that DNA is already used to work towards a better future, and will come to play even more beneficial roles in the actual future.
In conclusion, DNA has a variety of different uses in the present, and will have great uses in the future. However, none of this could have been possible without the various discoveries made in the past. If DNA’s role in heredity wasn’t discovered, it would be worthless to us today. Although we, in a very human manner, assume that all that needs to be discovered about DNA has been discovered, it may not be so and its uses may change radically in the future. However, we know for certain that DNA is not potentially harmful in any way as it occurs naturally. All in all, it has furthered science a lot, and will keep doing so in the future.
Works Cited
Betsch, David F. "DNA Fingerprinting in Human Health and Society." Angewandte Chemie 19 June 2004: 27-32.
Lorente, Jose. "Prokids DNA Analysis Laboratory." 9 November 2009. DNA-Prokids Web site. 20 October 2010 <http://www.dnaprokids.org/wp-content/uploads/2010/01/philippines-progr.net>.
Reno, Janet, et al. "The Future of Forensic DNA Testing." Predictions of the Research and Development Working Group. Washington DC: National Institute of Justice, 2000. 1-91.
Stint, Gunther. "DNA Through The Ages." 23 August 2009. Science Online Web site. 20 October 2010 <http://www.scienceonline/dnathruthages038492-34f23.html>.