Polygenic Risk Score (PRS) testing is a new clinical tool that estimates your genetic predisposition to diseases like heart disease, diabetes, and cancer. Here''s what it can — and can''t — tell you.
Polygenic Risk Score (PRS) testing is an evolving field within genetics that offers valuable insights into an individual's chance of developing certain diseases based on their genetic architecture. It is a new clinical tool now available to us.
In this article, we will explore what PRS testing is, its potential benefits, and important considerations to keep in mind.
What Is Polygenic Risk Score Testing?
A Polygenic Risk Score is a numerical value that estimates an individual's predisposition to certain diseases based on the cumulative effect of multiple genetic variants identified in worldwide populations. These common variants are identified through genome-wide association studies (GWAS) and can be associated with various health conditions.
Common diseases for which polygenic scores can provide information include:
- Coronary artery disease (CAD)
- Type 2 diabetes
- High blood pressure
- High body mass index (BMI)
- High triglycerides and low HDL cholesterol
- Polygenic hypercholesterolemia
- High lipoprotein (a)
- Breast cancer and colorectal cancer
- Alzheimer's disease
- Early menopause
- Osteoporosis
- Stroke
One of the most well-researched genetic risk scores involves the prediction of cardiovascular disease. As a rule, the higher the number of "variants" reported, the better the predictive accuracy of the test.
What Are the Benefits of PRS Testing?
1. Personalized Health Insights
PRS testing can provide personalized insights into your genetic risk. By understanding your lifetime risk, you can make informed lifestyle and medical decisions tailored to your specific health profile.
2. Early Detection and Prevention
Individuals identified with a higher polygenic risk for specific conditions may benefit from proactive health measures, including more frequent screenings, preventive strategies, or even considering starting medication treatment — as in the case of cardiometabolic diseases. Early detection can significantly improve treatment outcomes.
3. Enhanced Decision-Making
For individuals with a family history of certain diseases — such as heart failure, cardiovascular events, or increased risk of breast cancer — PRS testing can guide choices regarding lifestyle modifications, dietary changes, and other preventive interventions.
4. Impact on Family Planning
For prospective parents, PRS testing can inform decisions around family planning by identifying potential hereditary genetic associations for their children. This knowledge can allow for discussions on genetic counseling or further testing.
5. Research and Development
PRS testing contributes to the broader field of genetics and medicine by aiding researchers and doctors in identifying links between genetic factors and complex diseases — potentially leading to new treatments and preventative measures.
Who Should Consider PRS Testing?
PRS testing is particularly useful for those:
- With a strong family history of certain diseases
- Interested in understanding their genetic predisposition
- Looking to take proactive steps in their health management
- Involved in genetic studies for research
Note: The test is not diagnostic and is not indicated for patients presenting with acute disease.
Important Considerations
Interpretation of Results
PRS results do not determine certainty — they offer an absolute risk classification. Your risk will be reported as:
- Equal to individuals in the general population
- Borderline
- Intermediate
- High
A higher PRS score indicates increased risk, but it does not guarantee development of the condition. Environmental factors, family history, age, gender, ethnicity, and other health conditions can all further influence whether we manifest a disease.
Psychological Impact
Receiving information about potential health risks can be psychologically challenging. Individuals may feel anxiety or stress regarding their results. It's essential to approach PRS testing with the support of healthcare professionals.
Ethical Considerations
Ethical issues — such as genetic privacy and discrimination based on genetic information — are significant concerns in genetic testing. Awareness of these implications is critical for informed decision-making.
Choosing the Right PRS Testing Service
When choosing a PRS testing service, consider:
- Disease specificity: Find a test that aligns with your specific health concerns or family genetic history
- Scientific backing: Look for companies that provide peer-reviewed studies validating their testing methods
- Comprehensive reporting: Effective PRS testing should provide actionable insights, not just risk scores
- Medical collaboration: Investigate whether the service collaborates with healthcare professionals and genetic counselors
- Ethical standards and data privacy: Ensure the company follows stringent guidelines concerning data privacy and user consent
Conclusion
PRS testing can provide valuable information about your health. This innovative risk assessment tool offers insights into an individual's genetic predisposition for specific diseases — knowledge that can impact lifestyle decisions and motivate proactive healthcare measures.
It is crucial to seek guidance from healthcare providers and genetic counselors to review and understand the test findings. If you're interested in learning more about PRS testing and how it fits into a comprehensive preventive health strategy, contact us or call (610) 510-7152).
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Written by
Dr. Michaela Mocanu, MD, CHS, DABOM
Board-certified in Internal Medicine, Hypertension, and Obesity Medicine. Dr. Mocanu specializes in hypertension, kidney health, and weight management at her practice in King of Prussia, PA.
