GALNS rs794726887: Understanding Carrier Status
The rs794726887 variant is a genetic change located within the GALNS gene. It is identified in scientific literature as a carrier mutation associated with Mucopolysaccharidosis type IV-A, an inherited metabolic disorder.
What each genotype means
Typical GALNS gene profile
This genotype represents the common, non-variant form of the GALNS gene at this specific location. It is not associated with the carrier status for Mucopolysaccharidosis type IV-A described for this variant.
This is the most common genotype observed across all global populations.
Carrier of MPS IV-A variant
This genotype indicates you carry one copy of the variant, which is associated with carrier status for Mucopolysaccharidosis type IV-A (Morquio A syndrome). As this is an autosomal-recessive condition, carrying a single copy typically does not result in the disease, but you should discuss the implications of carrier status with a genetic counselor or clinician.
This specific variant is rare in the general population.
Potential MPS IV-A risk
This genotype indicates you carry two copies of the variant. Because this variant is linked to Mucopolysaccharidosis type IV-A, an autosomal-recessive condition, you should consult with a medical geneticist or healthcare provider to understand what this means for your health and to discuss potential clinical evaluation.
This genotype is extremely rare in the general population.
What is the rs794726887 Variant?
The rs794726887 variant is a specific single nucleotide polymorphism (SNP) found within the GALNS gene, which is located on chromosome 16. In genetics, a SNP represents a variation at a single position in the DNA sequence. This particular variant is categorized as a carrier mutation, meaning that an individual who possesses one copy of this variant typically does not exhibit symptoms of the associated condition. However, because the condition linked to this gene follows an autosomal recessive inheritance pattern, carriers have the potential to pass the variant to their offspring. Understanding such variants is a key component of carrier screening, which helps individuals understand their genetic makeup and the potential risks they might pass on to future generations. It is important to note that the presence of this variant does not constitute a diagnosis of a disease.
The Role of the GALNS Gene
The GALNS gene provides the essential instructions for the body to produce an enzyme known as N-acetylgalactosamine-6-sulfatase. This enzyme is primarily located within lysosomes, which are the recycling centers of the cell. Its main function is to break down complex sugar molecules called glycosaminoglycans (GAGs), specifically keratan sulfate. Keratan sulfate is a critical component of cartilage and the cornea of the eye. When the GALNS gene is functioning correctly, the body efficiently recycles these sugar chains. However, if the gene contains mutations that reduce or eliminate the activity of this enzyme, keratan sulfate cannot be broken down properly. This leads to the accumulation of these molecules within cells, which can eventually cause damage to various tissues and organs, leading to the clinical features observed in Mucopolysaccharidosis type IV-A, also known as Morquio syndrome.
Research and Clinical Associations
Research into the GALNS gene has identified over 148 different mutations that can lead to Mucopolysaccharidosis type IV-A. The variant rs794726887 is documented in genetic databases as a carrier mutation for this condition. The evidence strength for this association is considered moderate, reflecting its role in clinical carrier screening panels. Because Mucopolysaccharidosis type IV-A is an autosomal recessive disorder, an individual would generally need to inherit a non-working copy of the gene from both parents to manifest the disease. As a carrier, an individual has one functional copy of the gene and one copy with the variant, which is usually sufficient to maintain normal enzyme activity levels. Clinical interpretation of such variants is ongoing, and researchers continue to study how specific mutations impact enzyme function and overall health outcomes in different populations.
Population Frequency and Interpretation
The rs794726887 variant is classified as rare across global populations. Genetic frequency data is essential for understanding the prevalence of carrier status, but because this variant is rare, it is not commonly found in the general population. When interpreting genetic reports, it is vital to remember that carrier status is not a medical diagnosis. If you have received information about your carrier status for a condition like Mucopolysaccharidosis type IV-A, this information is intended for educational purposes and family planning discussions. It does not indicate that you have the disease or that you will develop it. If you have concerns about your genetic results or family history, the most appropriate step is to consult with a certified genetic counselor or a medical professional who can provide context based on your specific health history and clinical needs.
How common is this variant?
The rs794726887 variant is documented as rare in human populations, with limited frequency data available across major ancestral groups.
Frequently asked questions
What is Mucopolysaccharidosis type IV-A?
Mucopolysaccharidosis type IV-A, or Morquio syndrome, is a rare inherited metabolic disorder. It occurs when the body lacks the enzyme needed to break down sugar molecules called keratan sulfate, leading to their buildup in tissues.
Does being a carrier mean I have the disease?
No, being a carrier for an autosomal recessive condition like Mucopolysaccharidosis type IV-A typically means you have one working copy of the gene and one copy with a variant. Carriers generally do not show symptoms of the disease.
What should I do if I am a carrier?
If you are identified as a carrier, it is recommended to speak with a genetic counselor. They can help you understand the implications for your health and provide information regarding family planning.
Is this variant common?
No, the rs794726887 variant is considered rare. It is not frequently observed in the general population.
Sources & further reading
Educational information only, last refreshed 9/24/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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