DNA Technology in Medicine — 2015 Paper I
DNA technology in Medicine.
Model Answer
VAID ICSApproach
- Demand of Question: Explain how DNA-based technologies are applied to diagnosis, prevention and treatment of human diseases.
- Structuring the Response: Briefly identify major techniques and connect each with medical applications, while noting ethical concerns.
- Key Dimensions to Cover: PCR, sequencing, genetic diagnosis, prenatal testing, pharmacogenomics, recombinant DNA, gene therapy and personalized medicine.
Model Answer
Introduction: DNA technology comprises techniques for analysing, amplifying, sequencing and modifying genetic material. It has transformed medicine by enabling diagnosis and treatment at the molecular level.
Major applications
- Genetic diagnosis: DNA analysis detects mutations responsible for disorders such as:
- thalassaemia;
- sickle-cell disease;
- cystic fibrosis.
- PCR-based diagnosis: Polymerase Chain Reaction (PCR) amplifies specific DNA sequences, permitting detection of:
- pathogens;
- inherited mutations;
- very small biological samples.
- Prenatal diagnosis: DNA obtained through procedures such as amniocentesis or chorionic villus sampling can detect selected inherited abnormalities.
- DNA sequencing: Whole-genome and targeted sequencing help identify disease-associated variants.
- Recombinant DNA technology: It enables production of therapeutic proteins such as recombinant human insulin.
- Pharmacogenomics: Genetic variation can help predict:
Drug response → Appropriate drug/dose → Personalized treatment
- Gene therapy: Functional genetic material may be introduced or edited to treat selected genetic disorders.
DNA technology also supports cancer genomics and transplantation-related testing.
Ethical concerns
Issues include:
- genetic privacy;
- discrimination;
- informed consent;
- unequal access.
Conclusion: DNA technology has moved medicine toward early diagnosis, molecular therapy and personalized healthcare, while simultaneously creating important ethical responsibilities concerning the use of genetic information.
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