FXN rs149284013: Understanding Carrier Status and Friedreich Ataxia
The rs149284013 variant is a rare genetic change located within the FXN gene. It is recognized as a pathogenic variant associated with Friedreich ataxia, a recessive condition that typically requires inheriting specific genetic changes from both parents.
What each genotype means
Carrier of Friedreich ataxia variant
You carry one copy of the rare c.296_297insT frameshift insertion in the FXN gene, making you an asymptomatic carrier. Because Friedreich ataxia is inherited in an autosomal recessive manner, carriers typically do not experience symptoms themselves. However, there is a risk of having an affected child if your reproductive partner also carries an FXN pathogenic variant, such as an expanded GAA repeat or point mutation.
Extremely rare; observed at a minor allele frequency of less than 1 in 20,000 across global reference populations in gnomAD.
High risk for Friedreich ataxia
You carry two copies of the pathogenic c.296_297insT frameshift mutation in the FXN gene. Biallelic loss-of-function variants in FXN are associated with Friedreich ataxia, a progressive neurodegenerative condition characterized by sensory loss, muscle weakness, coordination deficits, and potential cardiomyopathy. Comprehensive clinical evaluation and genetic counseling are recommended to interpret this finding in the context of personal and family health history.
Extremely rare, with expected homozygous frequency well below 1 in 100,000,000 across worldwide populations.
What is the rs149284013 Variant?
The rs149284013 variant is a specific alteration in the DNA sequence of the FXN gene, which is located on chromosome 9. In genetic databases, this variant is sometimes referred to by its HGVS nomenclature, such as c.296_297insT, which describes an insertion of a single DNA building block. Because this change occurs within the coding region of the gene, it can disrupt the normal instructions for building a protein. Genetic variants like this are studied to understand how they contribute to inherited conditions. It is important to note that identifying a single variant does not provide a complete picture of an individual's health, as the context of the entire gene and the presence of other variants on the second copy of the gene are critical factors in how genetic traits are expressed.
The Role of the FXN Gene
The FXN gene provides instructions for making a protein called frataxin. This protein is primarily found in the mitochondria, which are the energy-producing centers of our cells. Frataxin plays a vital role in the assembly of iron-sulfur clusters, which are essential components for many proteins involved in energy production and other cellular processes. When the FXN gene is mutated, the body may produce insufficient or non-functional frataxin. A shortage of this protein can lead to a decrease in the activity of iron-sulfur cluster-containing proteins, potentially impairing mitochondrial function. This disruption is the underlying mechanism associated with Friedreich ataxia, a condition characterized by progressive nervous system damage and movement difficulties. Understanding the function of frataxin helps researchers investigate how different types of mutations, including point mutations and repeat expansions, impact cellular health.
Research and Clinical Associations
Research has established that Friedreich ataxia is primarily a recessive condition, meaning an individual typically needs to inherit two pathogenic variants—one from each parent—to manifest the condition. While the most common cause is an expansion of a GAA trinucleotide repeat in the FXN gene, approximately 2% of affected individuals are compound heterozygotes. This means they carry one expanded GAA repeat on one copy of the gene and a different pathogenic variant, such as rs149284013, on the other copy. The evidence linking rs149284013 to Friedreich ataxia is based on its classification as a pathogenic variant in clinical databases. However, the clinical outcome for any individual cannot be predicted solely by the presence of one variant. Because the condition is complex, clinical diagnosis relies on comprehensive genetic testing and evaluation by medical professionals.
Population Frequency and Interpretation
The rs149284013 variant is extremely rare in the general population, with a minor allele frequency (MAF) reported as less than 0.00005 in the gnomAD database. Because it is so uncommon, the vast majority of people do not carry this specific variant. When a rare variant is identified, it is often found in the context of clinical testing for individuals who have symptoms or a family history of a specific condition. It is essential to understand that being a carrier of a single pathogenic variant for a recessive condition generally does not cause the disease itself. If you have received results indicating the presence of this variant, it is recommended to consult with a genetic counselor or a healthcare provider. They can help interpret the findings in the context of your personal and family health history and explain what this means for you and your family members.
How common is this variant?
The rs149284013 variant is very rare, with a minor allele frequency of less than 0.00005 in the gnomAD database.
Frequently asked questions
What does it mean to be a carrier of a genetic variant?
Being a carrier means you have one copy of a gene with a variant and one copy that is typical. For recessive conditions like Friedreich ataxia, carriers typically do not show symptoms of the disease.
Does having this variant mean I have Friedreich ataxia?
Not necessarily. Friedreich ataxia is a recessive condition, meaning it usually requires two pathogenic variants to be present. A single variant alone is generally not enough to cause the condition.
Should I be worried if I have this variant?
Finding a rare variant can be concerning, but it is important to speak with a genetic counselor. They can provide context based on your specific results and family history.
How is Friedreich ataxia diagnosed?
Diagnosis is typically made through a combination of clinical evaluation by a neurologist and specialized genetic testing. Genetic testing looks for specific mutations, such as GAA repeat expansions or point mutations in the FXN gene.
Sources & further reading
Educational information only, last refreshed 10/28/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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