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Is Congenital Adrenal Hyperplasia Genetic?
Is Congenital Adrenal Hyperplasia hereditary? Here's what the research says about inherited risk.
- Heritability
- ~100%
- Inheritance
- autosomal-recessive
- Key genes
- CYP21A2
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CAH is caused by mutations in CYP21A2 affecting cortisol production. The most common form causes virilisation in female infants.
How Genetic Is Congenital Adrenal Hyperplasia?
Congenital Adrenal Hyperplasia has a strong genetic basis. Research estimates heritability at approximately 100%, meaning genetic factors account for the majority of variation in whether individuals develop this condition.
Key genes associated with Congenital Adrenal Hyperplasia: CYP21A2. 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 Congenital Adrenal Hyperplasia?
Yes — family history is one of the strongest predictors of Congenital Adrenal Hyperplasia. If a first-degree relative (parent, sibling, or child) has been diagnosed, your own risk may be significantly elevated. Discussing your family history with a healthcare provider or genetic counsellor is strongly recommended.
Frequently Asked Questions
Is Congenital Adrenal Hyperplasia genetic?
This condition has a strong genetic basis. Studies suggest heritability of approximately 100%. Key genes involved include CYP21A2.
Can a DNA test reveal my risk of Congenital Adrenal Hyperplasia?
Genetic testing can identify relevant variants, though Congenital Adrenal Hyperplasia risk is influenced by many factors. Talk to your doctor about appropriate testing.
Does family history matter for Congenital Adrenal Hyperplasia?
Yes — family history is one of the strongest predictors of Congenital Adrenal Hyperplasia. If a first-degree relative has been diagnosed, your own risk may be significantly elevated.
Is Congenital Adrenal Hyperplasia hereditary, meaning it's passed directly from parent to child?
Congenital Adrenal Hyperplasia follows a autosomal-recessive inheritance pattern in cases with a clear genetic cause, though not every case is inherited directly from a parent — some arise from new (de novo) mutations or a combination of genetic and environmental factors.
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- MedlinePlus Genetics
- MedlinePlus Genetics — National Library of Medicine
- CDC Genomics and Precision Health
Last updated: · Reviewed by the 247GeneticCheck editorial team
Content compiled with reference to peer-reviewed genetics literature and testing-provider documentation. This site does not provide medical or genetic counselling advice — always consult a healthcare professional or genetic counsellor before acting on DNA test results.