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Genetic predisposition: how heredity affects the risk of disease
What is genetic predisposition?
Genetic predisposition is an increased risk of developing certain diseases due to the presence of specific genetic variants (mutations) that are passed down from parents. This does not mean that a person will necessarily develop the disease, but the likelihood of developing the disease is significantly higher than in people without such changes in their DNA.
WHO notes that about 10% All diseases have a clear genetic component, and even more diseases are of a mixed nature, where genes interact with environmental factors (WHO, 2023).
What diseases are associated with genetic predisposition?
Oncology: breast cancer (BRCA1/2), prostate cancer, colorectal cancer (Lynch syndrome)
Cardiovascular diseases: early infarction, hypertension, thrombophilia
Metabolic diseases: type 2 diabetes, obesity
Mental disorders: depression, bipolar disorder, schizophrenia
Neurology: Alzheimer's disease, Parkinson's disease
Autoimmune diseases: celiac disease, rheumatoid arthritis, systemic lupus erythematosus
How to detect a predisposition
You can identify the tendency using genetic tests. Most often, they analyze specific gene variants associated with increased risk.
Some tests are recommended if you have:
multiple cases of the same type of cancer in the family
diagnoses in close relatives at a young age
rare or severe chronic diseases with no identified cause
planning a child with an existing diagnosis in the family
How do risks differ from diagnosis?
It is important to understand: genetic predisposition is not a disease. This is a factor that indicates a higher probability of its occurrence. The presence of a mutation is only one of the components. The development of the disease is also influenced by:
lifestyle (nutrition, physical activity)
external environment (ecology, stress, toxins)
concomitant diseases
hormonal and age-related changes
Therefore, timely identification of genetic factors allows measures to be taken to reduce the risk.
Example
A woman has a BRCA1 mutation. This increases her risk of developing breast cancer to 80%. But if she gets annual MRIs, makes lifestyle changes, and in some cases, gets preventive treatment, her chances of detecting cancer early or preventing it increase significantly.
Table: Examples of genetic predisposition
| Disease | Associated gene | Risk of mutation | Recommended actions |
|---|---|---|---|
| Breast cancer | BRCA1, BRCA2 | Up to 80% | Monitoring, prevention |
| Thrombophilia | F5, F2 | 3–5 times higher | Coagulogram, hormone avoidance |
| Type 2 diabetes | TCF7L2, PPARG | +40–60% | Weight control, nutrition |
| Alzheimer's disease | APOE ε4 | Up to 3 times higher | Prevention of cognitive disorders |
| Hemochromatosis | HFE | 5–10 times higher | Avoid iron, monitor ferritin |
What international organizations say
FDA approves tests that detect hereditary predisposition to diseases and recommends them for family planning or if there is a family history
Mayo Clinic emphasizes the role of genetic counseling — correct understanding of the result is key to decision-making
WHO considers genetic diagnostics as part of the preventive medicine of the future
Genetic predisposition is not a sentence, but a tool. By learning more about your DNA profile, you can change the course of events: reduce risks, make better health choices, and take timely care of your future.
