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Is Long QT Syndrome Genetic?
Is Long QT Syndrome hereditary? Here's what the research says about inherited risk.
- Heritability
- ~90%
- Inheritance
- autosomal-dominant
- Key genes
- KCNQ1,KCNH2,SCN5A
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Long QT syndrome is an inherited heart rhythm disorder that can cause fast and chaotic heartbeats and increases the risk of sudden death.
How Genetic Is Long QT Syndrome?
Long QT Syndrome has a strong genetic basis. Research estimates heritability at approximately 90%, meaning genetic factors account for the majority of variation in whether individuals develop this condition.
Key genes associated with Long QT Syndrome: KCNQ1,KCNH2,SCN5A. 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 Long QT Syndrome?
Yes — family history is one of the strongest predictors of Long QT Syndrome. 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 Long QT Syndrome genetic?
This condition has a strong genetic basis. Studies suggest heritability of approximately 90%. Key genes involved include KCNQ1,KCNH2,SCN5A.
Can a DNA test reveal my risk of Long QT Syndrome?
Yes — DNA tests such as CircleDNA's Premium Test include reports on Long QT Syndrome risk based on your genetic variants.
Does family history matter for Long QT Syndrome?
Yes — family history is one of the strongest predictors of Long QT Syndrome. If a first-degree relative has been diagnosed, your own risk may be significantly elevated.
Is Long QT Syndrome hereditary, meaning it's passed directly from parent to child?
Long QT Syndrome follows a autosomal-dominant 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.
For nutritional data that may be relevant to managing Long QT Syndrome, our calorie and nutrition checker covers thousands of foods. If you take medication alongside a genetic condition, check drug interaction guidance before combining supplements or treatments.