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Is Intellectual Disability Genetic?
- Heritability
- ~70%
- Inheritance
- polygenic
- Key genes
- MECP2 SHANK3 PTEN
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50–70% of severe intellectual disability has a genetic cause including chromosomal abnormalities single gene disorders or polygenic risk.
How Genetic Is Intellectual Disability?
Intellectual Disability involves complex interactions between multiple genes and environmental factors. Heritability estimates range up to 70%, though no single gene determines outcome on its own.
Key genes associated with Intellectual Disability: MECP2 SHANK3 PTEN. Variants in these genes have been identified through genome-wide association studies (GWAS) and clinical research as influencing susceptibility or severity.
Source: MedlinePlus Genetics
Does Family History Matter for Intellectual Disability?
Family history can be informative for Intellectual Disability, but its predictive power is limited because many genes — each with small effects — combine with environmental influences. A family history of the condition may prompt earlier or more frequent screening.
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