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Congenital long QT syndrome

KCNQ1 · rs199473470

Where this position leads

Condition: QT Interval and Drug-Induced Long QT

rs199473470 Condition: QT Interval and Drug-Induced Long QT QT Interval and Drug-Induced Long QT Condition rs199473470 rs199473470 KCNQ1

Strength of the evidence

2 / 4

ClinVar classifies it as disease-causing (or likely), reviewed at 1 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 Likely pathogenic for Long QT syndrome; criteria provided, single submitter (1 of 4 stars, 1 submitter), last evaluated 2023-03-10. ClinVar record 1411474 NM_000218.3(KCNQ1):c.959C>T (p.Pro320Leu)

Classification Conflicting classifications of pathogenicity for Long QT syndrome; criteria provided, conflicting classifications (1 of 4 stars, 2 submitters), last evaluated 2023-03-10. ClinVar record 2126605 NM_000218.3(KCNQ1):c.959C>G (p.Pro320Arg)

Classification Pathogenic for Congenital long QT syndrome, Long QT syndrome; criteria provided, single submitter (1 of 4 stars, 2 submitters), last evaluated 2018-08-26. ClinVar record 53148 NM_000218.3(KCNQ1):c.959C>A (p.Pro320His)

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

A/A Two copies of the version ClinVar lists as disease-causing for Congenital 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. So far only one lab has made this call, so it may change. (ClinVar VCV000053148, criteria provided, single submitter)
A/C One copy of the version ClinVar lists as disease-causing for Congenital 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. So far only one lab has made this call, so it may change. (ClinVar VCV000053148, criteria provided, single submitter)
C/C No copy of the version ClinVar lists as disease-causing for Congenital long QT syndrome. This is the usual result. So far only one lab has made this call, so it may change. (ClinVar VCV000053148, criteria provided, single submitter)

Source: ClinVar VCV000053148, criteria provided, single submitter

Questions about rs199473470

What is rs199473470?

rs199473470 is a single position in the genome, in or near the KCNQ1 gene. Published research associates it with congenital 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 rs199473470 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 rs199473470 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 rs199473470 come from?

ClinVar VCV000053148, criteria provided, single submitter. Every variant on MyGeneLog comes from public primary sources and is published with its citation and the date it was checked.

Quoting this page

Licensed CC BY-NC 4.0: free to read, share and adapt for non-commercial use, naming MyGeneLog™ and linking the exact page. Commercial use, including training or serving a commercial AI system, needs a licence — https://www.mygenelog.com/license

Congenital long QT syndrome (rs199473470). MyGeneLog™. https://www.mygenelog.com/variants/rs199473470

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