polygenic disorder
Definition
Noun: A polygenic disorder is an inherited disease or medical condition whose occurrence and expression are influenced by multiple genes, often in combination with environmental factors. Unlike single-gene disorders, it does not follow simple Mendelian patterns of inheritance.
Usage
This term is used in medical genetics and biology to describe complex diseases where the genetic contribution comes from many genes, each with a relatively small effect. * Heart disease is considered a polygenic disorder, making it difficult to predict based on genetics alone. * Researchers are studying the genetic architecture of polygenic disorders like type 2 diabetes.
Advanced Usage
- Polygenic Risk Score (PRS): A modern application is the calculation of a "polygenic risk score," which estimates an individual's genetic liability for a specific polygenic disorder based on the combined effect of many genetic variants.
- Her high polygenic risk score indicated a greater genetic predisposition to the disorder.
Variants and Related Words
- Complex disease: A common synonym emphasizing the interaction of multiple genetic and environmental factors.
- Multifactorial disorder: A closely related term highlighting that both genetic (polygenic) and non-genetic (environmental, lifestyle) factors contribute to the disease.
Synonyms
- Complex disease
- Multifactorial inheritance disorder
Related Terms and Concepts
- Single-gene disorder (Monogenic disorder): An inherited disease caused by a mutation in a single gene (e.g., cystic fibrosis, sickle cell anemia). This is the primary conceptual contrast to a polygenic disorder.
- Quantitative trait: A measurable phenotype (like height or blood pressure) that varies continuously in a population and is typically influenced by many genes (polygenic) and the environment. Many polygenic disorders are considered threshold quantitative traits.
Noun
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an inherited disease controlled by several genes at once
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