HEXA rs11558492: Understanding Tay-Sachs Carrier Status
The rs11558492 variant is a specific genetic change located within the HEXA gene. It is classified as a pathogenic mutation associated with carrier status for Tay-Sachs disease, an inherited condition that affects the nervous system.
What each genotype means
Typical HEXA function
This genotype represents the common, functional version of the HEXA gene. Individuals with this profile do not carry the specific pathogenic splice site mutation associated with Tay-Sachs disease at this location.
This is the most common genotype found in the vast majority of the global population.
Tay-Sachs carrier status
This genotype indicates you carry one copy of the pathogenic c.1421+1G>C mutation, which disrupts normal splicing of the HEXA gene. Carriers are typically asymptomatic but may have reduced enzyme activity; you should consult a genetic counselor or physician to discuss reproductive risks and family planning.
This carrier state is found in approximately 1 in 30 individuals of Ashkenazi Jewish ancestry and is significantly rarer in other populations.
Potential Tay-Sachs risk
This genotype indicates the presence of two copies of the pathogenic c.1421+1G>C mutation, which is associated with the development of Tay-Sachs disease. This condition is a severe, progressive neurodegenerative disorder, and you should seek evaluation from a medical geneticist or specialist for clinical confirmation and management.
This genotype is extremely rare in the general population.
What is the rs11558492 Variant?
The rs11558492 variant, often referred to in clinical literature by its HGVS nomenclature c.1421+1G>C, is a single nucleotide variant located within the HEXA gene. This gene is situated on chromosome 15 at position 15q23. In genetics, a splice junction mutation like this one occurs at the boundary where non-coding segments of a gene, known as introns, are removed during the processing of genetic instructions. When this specific site is altered, it can disrupt the normal production of the protein the gene is meant to create. Because this variant is categorized as pathogenic, it is recognized by clinical databases as a significant genetic change that can interfere with normal biological function. It is one of several known mutations in the HEXA gene that have been identified through molecular genetic testing and clinical research.
The Role of the HEXA Gene
The HEXA gene provides the essential instructions for the body to produce an enzyme called beta-hexosaminidase A. This enzyme plays a critical role in the lysosomes, which are the recycling centers of our cells. Its primary job is to break down a fatty substance known as GM2 ganglioside. When the HEXA gene functions correctly, this substance is processed and cleared from the cells. However, if the gene contains a pathogenic mutation, the resulting enzyme may be absent or non-functional. Without this enzyme, GM2 ganglioside accumulates to toxic levels, particularly within the nerve cells of the brain and spinal cord. This accumulation is the underlying cause of Tay-Sachs disease, a progressive condition that leads to the loss of motor skills and other neurological symptoms.
Research and Clinical Significance
Research into rs11558492 has established it as a pathogenic variant linked to Tay-Sachs disease. The evidence for this classification is strong, supported by multiple clinical submissions in databases like ClinVar. Tay-Sachs disease follows an autosomal recessive inheritance pattern, meaning an individual must inherit two copies of a pathogenic variant—one from each parent—to develop the condition. A person who carries only one copy of this variant is considered a carrier. Carriers typically do not exhibit symptoms of the disease because their remaining functional copy of the HEXA gene produces enough enzyme to maintain normal cellular health. However, carriers can pass the variant to their children. If both parents are carriers, there is a 25% chance with each pregnancy that the child will inherit two copies of the variant and be affected by the disease.
Population Frequency and Distribution
The frequency of HEXA variants varies significantly across different ethnic groups. The rs11558492 variant is notably more common in individuals of Ashkenazi Jewish descent. In this population, the carrier frequency for Tay-Sachs-related mutations is estimated to be approximately 1 in 30. While anyone, regardless of ancestry, can be a carrier of a HEXA mutation, the higher prevalence in specific groups has led to the inclusion of this variant in targeted carrier screening panels. These panels are designed to help individuals understand their reproductive risks. It is important to note that while these statistics provide a general overview of population risk, they do not predict the status of any specific individual. Genetic testing is the only way to determine an individual's carrier status.
What This Information Means for You
Understanding your carrier status for a variant like rs11558492 is primarily relevant for family planning and reproductive health. If you are concerned about your carrier status, the most appropriate step is to consult with a healthcare provider or a certified genetic counselor. They can interpret your results in the context of your personal and family history and explain the implications for your health and your family. It is important to remember that being a carrier does not mean you have or will develop Tay-Sachs disease. This information is intended for educational purposes and should not be used to diagnose any condition or make medical decisions. Always discuss genetic findings with a qualified professional who can provide personalized guidance based on your specific situation.
How common is this variant?
The carrier frequency for Tay-Sachs-related mutations is approximately 1 in 30 in the Ashkenazi Jewish population, compared to roughly 1 in 250 to 1 in 300 in the general population.
Frequently asked questions
What is a carrier of Tay-Sachs disease?
A carrier is someone who has one copy of a pathogenic HEXA mutation but does not have the disease themselves. They have one functional copy of the gene that produces enough enzyme to prevent symptoms.
Can I be tested for the rs11558492 variant?
Yes, this variant is often included in carrier screening panels. You can discuss testing options with your doctor or a genetic counselor to see if it is appropriate for you.
If I am a carrier, will my children have Tay-Sachs?
If only one parent is a carrier, the child will not have Tay-Sachs disease, though they have a 50% chance of being a carrier themselves. If both parents are carriers, there is a 25% chance for each child to be affected.
Is Tay-Sachs disease treatable?
Currently, there is no cure for Tay-Sachs disease. Management focuses on supportive care to address symptoms and improve the quality of life for affected individuals.
Sources & further reading
Educational information only, last refreshed 10/13/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Canonical splice junction variant (c.1073+1G>A) causing Tay-Sachs disease.
Pathogenic splice-junction variant (c.1073+1G>A / IVS9+1G>A) causing Tay-Sachs disease when in compound heterozygosity or homozygosity.
Pathogenic splice donor variant (c.1421+1G>C) in HEXA underlying carrier status for autosomal recessive infantile Tay-Sachs disease.
This HEXA variant is associated with Tay-Sachs disease, particularly late-onset forms.
Pathogenic HEXA splice donor site mutation (c.1073+1G>A) causing Tay-Sachs disease, common in carrier screening panels for Ashkenazi Jewish and French Canadian ancestry.
A 4-bp insertion (c.1278dupTATC) in HEXA that accounts for over 70% of Tay-Sachs disease alleles in Ashkenazi Jewish carrier screening panels.