DNA Fingerprinting: How It Works and Its Key Uses
This paper provides an overview of DNA fingerprinting, explaining the biological basis of the technique and the laboratory steps involved in producing a DNA fingerprint. It covers how restriction enzymes, gel electrophoresis, and radioactive or colored probes are used to generate unique genetic patterns. The paper then examines the major applications of DNA fingerprinting, including the diagnosis and research of inherited disorders, personal identification, forensic criminal investigation, and paternity testing. It also briefly addresses limitations of the technique, such as challenges in determining probability and potential technical difficulties during the probing process.
- Introduction to DNA Fingerprinting: Definition, basis, and uniqueness of DNA fingerprints
- How DNA Fingerprinting Works: Five laboratory steps to produce a DNA fingerprint
- Diagnosis of Inherited Disorders: Using DNA fingerprints to detect and research genetic diseases
- Forensic, Paternity, and Personal Identification Uses: Criminal investigation, paternity, and missing persons applications
- Limitations of DNA Fingerprinting: Probability challenges and technical difficulties in fingerprinting
- References: Cited sources for DNA fingerprinting information
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What makes this paper effective
- Provides a clear, logical progression from defining the concept to explaining the process, then covering real-world applications, and finally acknowledging limitations.
- Uses accessible, non-technical language that makes a complex biological process understandable to a general audience.
- Supports claims with references to credible sources and grounds each application area in concrete examples (e.g., cystic fibrosis, hemophilia, crime scene evidence).
Key academic technique demonstrated
The paper demonstrates effective use of process description — breaking down a multi-step laboratory procedure into sequential, numbered stages that guide the reader through DNA isolation, cutting, transfer, and probing. This technique is well-suited to science writing where procedural clarity is essential.
Structure breakdown
The paper opens with a definition and biological rationale for DNA fingerprinting. It then walks through the five laboratory steps involved in creating a fingerprint. The bulk of the paper addresses five distinct application areas (inherited disorder diagnosis, developing cures, personal identification, forensic use, and paternity testing), each treated as a separate subsection. The paper closes with a brief discussion of limitations related to probability determination and technical error. This structure — define, process, apply, critique — is a standard and effective approach for introductory science topics.
Introduction to DNA Fingerprinting
Techniques to retrieve DNA and the development of DNA probes have made it possible to match DNA molecules to other DNA molecules for purposes such as identification. This process has been incorporated into what is known as DNA fingerprinting. DNA fingerprinting is a test for the identification and evaluation of genetic information — that is, an individual's DNA. The technique is referred to as a "fingerprint" because no two people can have exactly the same DNA information, just as no two people share the same fingerprints.
The DNA structure itself is the same in every person; the only differences lie in the base pairs, which give rise to different DNA sequences. The same DNA fingerprint is present in every cell, tissue, and organ of an individual, and no known treatment can alter it. For this reason, DNA fingerprinting is rapidly becoming a widely used method for the identification and differentiation of human beings (WebMD, 2012).
How DNA Fingerprinting Works
Producing a DNA fingerprint in the laboratory involves several distinct steps. The first step is the isolation of DNA from a given sample. The sample can be blood, semen, hair, or saliva — even in very small amounts, such as a single hair strand or a drop of blood. This sample contains white blood cells that are broken down so that DNA can be removed from them along with other cellular material.
The second step is cutting, sizing, and sorting the isolated DNA. The DNA is cut into small pieces using special enzymes known as restriction enzymes, which act at specific regions of the DNA strand. The third step involves transferring the DNA to nylon: the DNA pieces are placed on a gel, nylon sheets are laid on top, and the assembly is soaked overnight so that the DNA transfers onto the sheets. The fourth step is known as probing — radioactive or colored probes are added to the nylon sheet, producing the characteristic banded patterns known as DNA fingerprints. The final DNA fingerprint is built by using five to ten probes simultaneously (Lieberman & Brinton, 2004).
Diagnosis of Inherited Disorders
DNA fingerprints are very useful in several areas of society and are employed by professionals in both the health and justice systems.
DNA fingerprints can be used to diagnose inheritable disorders in prenatal and newborn screenings in hospitals around the world. Some of the conditions that can be diagnosed using DNA fingerprints include cystic fibrosis, hemophilia, Alzheimer's disease, and sickle cell anemia, among others. The early detection made possible by DNA fingerprinting enables medical staff and parents to prepare for how affected children will be treated. Information from genetic fingerprints can be used by genetic counselors to help prospective parents understand the risks of having an affected child. Those who intend to become parents can also use this information to make informed decisions regarding affected pregnancies (Betsch, 2000).
DNA fingerprints also provide critical information for research programs involved in locating inherited disorders on chromosomes. When the DNA fingerprints of relatives with a family history of a particular disorder are studied, or when comparisons are made between a large group of people who have a disorder and those who do not, conclusions can be drawn about patterns associated with the disease in question. This represents a crucial first step in designing genetic cures for these disorders (Betsch, 2000).
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