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How can genetic testing identify disease risk before symptoms appear?
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Human Genome Project
The Human Genome Project, which operated from 1990 to 2003, provided researchers with basic information about the genetic content of the human organism, opening new avenues of discovery in fields such as cancer research.
Genetic testing identifies disease risk before symptoms appear through presymptomatic diagnosis, a process that analyzes an individual's DNA to detect specific mutations or genetic markers associated with inherited disorders.12
Because human genome research has identified specific sequence variations that contribute to disease, health care professionals can practice predictive medicine. The process typically involves:2
- Targeted Analysis: Individuals with a family history of a disorderāsuch as certain cancersāare tested for known mutations.12
- Technological Methods: Scientists use various tools, including polymerase chain reaction (PCR) and microarray analysis, to scan for point mutations or chromosomal abnormalities.1
- Early Intervention: Identifying these risks allows for preventative measures, such as heightened surveillance (e.g., frequent screenings) or lifestyle adjustments, which can prevent the clinical onset of symptoms or ensure early, more effective treatment.12
While these tests are powerful, they raise important ethical considerations regarding privacy, potential discrimination by insurance companies, and the psychological impact of receiving predictive health information.1