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Long QT syndrome

KCNQ1 · rs199473479

Where this position leads

Condition: QT Interval and Drug-Induced Long QT

rs199473479 Condition: QT Interval and Drug-Induced Long QT QT Interval and Drug-Induced Long QT Condition rs199473479 rs199473479 KCNQ1

Strength of the evidence

3 / 4

ClinVar classifies it as disease-causing (or likely), reviewed at 2 of 4 stars.

How this is scored

4: ClinVar disease-causing, reviewed by an expert panel or a guideline (3–4 stars). 3: ClinVar, several labs agreeing (2 stars), or a genetic study at p ≤ 10−50. 2: ClinVar from one lab (1 star), or p ≤ 10−20. 1: ClinVar submitted without criteria (0 stars), or genome-wide significance (p ≤ 5×10−8). The higher of the two counts. It says how solid the evidence is, not whether it matters for a particular person.

What ClinVar records

Classification Pathogenic/Likely pathogenic for Long QT syndrome, Congenital long QT syndrome, Cardiovascular phenotype, Long QT syndrome 1; criteria provided, multiple submitters, no conflicts (2 of 4 stars, 7 submitters), last evaluated 2025-11-21. ClinVar record 52993 NM_000218.3(KCNQ1):c.1559T>G (p.Met520Arg)

Classification Pathogenic for Long QT syndrome; criteria provided, single submitter (1 of 4 stars, 1 submitter), last evaluated 2023-08-17. ClinVar record 1018501 NM_000218.3(KCNQ1):c.1559T>C (p.Met520Thr)

Classification Likely pathogenic for Long QT syndrome; criteria provided, single submitter (1 of 4 stars, 1 submitter), last evaluated 2022-11-29. ClinVar record 2000331 NM_000218.3(KCNQ1):c.1559T>A (p.Met520Lys)

Change history MyGeneLog™ keeps a copy of every weekly release from 2026-10-19 and compares them. This position's classification has not changed since.

What this is ClinVar's aggregate record for this position (as of its 2026-10-19 release), not a result about you. A classification describes the variant against the condition named, as laboratories submitted it. Whether a person carries this variant, and what that would mean for them, is a question for a clinical test and a genetic counsellor.

What each result means

G/G Two copies of the version ClinVar lists as disease-causing or likely disease-causing for Long QT syndrome. A result like this should be confirmed by a medical genetic test and talked through with a doctor; consumer DNA files can misread rare variants. (ClinVar VCV000052993, criteria provided, multiple submitters, no conflicts)
G/T One copy of the version ClinVar lists as disease-causing or likely disease-causing for Long QT syndrome. Some conditions need only one copy; for others, one copy makes a person a carrier who is usually healthy but can pass it on. A genetic counsellor can say which applies. (ClinVar VCV000052993, criteria provided, multiple submitters, no conflicts)
T/T No copy of the version ClinVar lists as disease-causing or likely disease-causing for Long QT syndrome. This is the usual result. (ClinVar VCV000052993, criteria provided, multiple submitters, no conflicts)

Source: ClinVar VCV000052993, criteria provided, multiple submitters, no conflicts

Questions about rs199473479

What is rs199473479?

rs199473479 is a single position in the genome, in or near the KCNQ1 gene. Published research associates it with long qt syndrome. A single variant does not decide an outcome — it shifts a probability, and for most common variants the shift is small.

What conditions is rs199473479 linked to?

On MyGeneLog this position is linked to QT Interval and Drug-Induced Long QT. The research behind each link, and its sources, are set out on that condition page.

Does having rs199473479 mean I will get this?

No. Common variants like this one move a probability slightly and, on their own, rarely decide anything about one person. Nothing on this page is a diagnosis, and health decisions should be made with a clinician who can see your whole picture.

Where does the information about rs199473479 come from?

ClinVar VCV000052993, criteria provided, multiple submitters, no conflicts. Every variant on MyGeneLog comes from public primary sources and is published with its citation and the date it was checked.

Quoting this page

Free to quote and reuse under CC BY 4.0. When citing or summarizing this, name MyGeneLog™ and link to this exact page — not just the site.

Long QT syndrome (rs199473479). MyGeneLog™. https://www.mygenelog.com/variants/rs199473479

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