KCNQ1 rs2519184: What Your Genotype Means
The rs2519184 variant is a single nucleotide polymorphism located in the 3' untranslated region (3'UTR) of the KCNQ1 gene. Research has investigated its potential to influence the duration of the QTc interval, a measure of heart rhythm, by affecting how the KCNQ1 gene is expressed.
What each genotype means
Baseline KCNQ1 expression
This genotype represents the ancestral state of the rs2519184 variant. Research in specific long QT syndrome (LQT1) founder populations suggests that individuals without the derived 'A' allele may have different clinical outcomes when a primary KCNQ1 mutation is present, compared to those who carry the 'A' allele. Please discuss any concerns regarding your heart rhythm or genetic risk with your clinician.
Frequency varies significantly by ancestry, with the 'G' allele being the ancestral form found globally.
Modified KCNQ1 expression
Carrying one copy of the derived 'A' allele has been studied as a potential genetic modifier in individuals who also have a primary KCNQ1 mutation. In some clinical studies, the presence of this variant has been associated with changes in the QTc interval and symptom severity in LQT1 patients. Because these effects are highly dependent on your specific genetic background and the presence of other mutations, please consult with a cardiologist or genetic counselor to understand what this means for your health.
The 'A' allele frequency is variable, occurring at a minor allele frequency of approximately 0.1 in some studied founder populations.
Modified KCNQ1 expression
Carrying two copies of the derived 'A' allele may influence the expression of the KCNQ1 gene. Research indicates that this variant can act as a modifier of the QTc interval in individuals who already carry a disease-causing KCNQ1 mutation. If you are aware of a personal or family history of long QT syndrome, please discuss the implications of this genotype with your healthcare provider.
This homozygous genotype is less common than the heterozygous state and its prevalence is highly dependent on ancestral background.
What is rs2519184?
The rs2519184 variant is a single nucleotide polymorphism (SNP) situated in the 3' untranslated region (3'UTR) of the KCNQ1 gene. The 3'UTR is a segment of messenger RNA that follows the protein-coding region and plays a critical role in regulating gene expression, including the stability and translation of the mRNA. Because this variant is located in a regulatory region rather than the protein-coding sequence, it does not change the structure of the resulting protein. Instead, researchers have hypothesized that it may influence the amount of KCNQ1 protein produced. By altering the efficiency of gene expression, variants in this region can potentially modify the physiological processes controlled by the gene, such as the electrical activity of heart cells.
The Role of the KCNQ1 Gene
The KCNQ1 gene provides instructions for making a potassium channel protein known as Kv7.1. These channels are essential for the proper electrical function of the heart, as they allow potassium ions to flow out of cardiac cells, a process necessary for the heart to reset its electrical state between beats. This resetting process is known as repolarization. When KCNQ1 function is impaired, it can lead to Long QT Syndrome (LQT1), a condition characterized by a prolonged QTc interval on an electrocardiogram (ECG) and an increased risk of irregular heart rhythms. Because the gene is so vital for cardiac stability, researchers often study non-coding variants like rs2519184 to see if they act as 'modifiers' that can either dampen or exacerbate the effects of other, more severe mutations in the same gene.
Research and Evidence Strength
The evidence linking rs2519184 to clinical outcomes is considered moderate and context-dependent. Early studies suggested that this SNP, along with others in the 3'UTR, could modify the severity of Long QT Syndrome by influencing the expression of the KCNQ1 allele on which it resides. Some research indicated that specific haplotypes might be associated with shorter QTc intervals or fewer symptoms in patients who already carry a disease-causing KCNQ1 mutation. However, other studies have found that these associations can be inconsistent or disappear when controlling for specific population-based mutations or genetic backgrounds. Because findings have varied across different cohorts and study designs, the scientific community views this variant as a potential modifier rather than a primary cause of heart disease. It is not a diagnostic marker for heart conditions.
Understanding Your Results
If you have received information about your rs2519184 genotype, it is important to understand that this variant is not a standalone predictor of heart health. The scientific literature emphasizes that its effects are often only observed in the presence of other, more significant genetic factors. You cannot use this information to diagnose a medical condition or predict your risk of arrhythmia. If you are concerned about your heart health, your family history, or the results of a genetic test, you should discuss these findings with a qualified healthcare provider or a genetic counselor. They can help interpret your results in the context of your overall health and clinical history. Never make changes to your medications or health routines based on this genetic information without consulting your clinician or pharmacist.
How common is this variant?
The frequency of the rs2519184 alleles varies significantly across different ancestral groups, and population-specific data should be consulted in databases like gnomAD for precise local estimates.
Frequently asked questions
Does rs2519184 cause Long QT Syndrome?
No, rs2519184 is not considered a primary cause of Long QT Syndrome. It is a non-coding variant that researchers have studied as a potential modifier of disease severity in individuals who already carry other, more significant genetic mutations.
Can I use this SNP to predict my risk of heart disease?
No. This variant is not a diagnostic tool and cannot be used to predict your personal risk of developing heart disease or arrhythmias. Genetic risk is complex and involves many factors beyond a single SNP.
What should I do if I have the 'A' allele?
The presence of a specific allele at this location does not require any medical action. If you have concerns about your heart health or genetic test results, please consult with a physician or a genetic counselor.
Is this variant related to medication response?
There is no established clinical guidance linking rs2519184 to specific medication dosing. Always consult your pharmacist or doctor before making any changes to your prescribed medications.
Sources & further reading
Educational information only, last refreshed 10/30/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This 3'UTR variant in KCNQ1 modulates gene expression and is linked to clinical variability in QTc intervals.
A 3'UTR variant in KCNQ1 that acts as a regulatory element affecting cardiac repolarization phenotypes.
A rare variant in the KCNQ1 gene associated with Long QT syndrome.
Pathogenic missense variant associated with Long QT syndrome type 1.
This variant is associated with Long QT syndrome 1, a condition affecting the heart's electrical activity.
Pathogenic variant associated with Long QT Syndrome type 1 (Romano-Ward syndrome).