Disorders Due to Mutations in Multiple Genes : (Polygenic Disorders)

Polygenic disorders are conditions caused by mutations in more than one gene. These disorders result from a complex interplay of genetic defects, environmental factors, and lifestyle influences. Unlike single-gene disorders, polygenic disorders do not follow Mendel's principles of heredity, making them harder to predict or categorise.

• Mutations in several genes contribute to the development of these disorders. Each mutated gene adds to the overall severity of the condition.
• Exposure to harmful environmental factors during pregnancy can increase the severity of these disorders. Examples include malnutrition, infections, or exposure to toxins during foetal development.
• Poor diet, lack of physical activity, smoking, or other unhealthy habits can exacerbate these conditions.

Examples of Polygenic Disorders:

• Congenital Defects: Cleft lip and cleft palate, constricted Stomach, and spina bifida
• Chronic Conditions: Diabetes, high blood pressure, heart disorders, asthma, and obesity.

1. Regular prenatal care to monitor foetal health and detect abnormalities early.
2. Maintaining a balanced diet, exercising regularly, and avoiding harmful substances can reduce risks.
3. Families with a history of polygenic disorders can seek genetic counselling to understand potential risks.
4. Avoiding exposure to environmental toxins or harmful substances during pregnancy can lower the risk of foetal abnormalities.