SACS rs1057516438: Understanding This Rare Genetic Variant
The rs1057516438 variant is a rare genetic change located within the SACS gene. It is associated with Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay (ARSACS), a complex neurodegenerative condition.
What each genotype means
Carrier of variant
This genotype indicates you are a carrier of the AAGA deletion variant in the SACS gene. Because ARSACS is an autosomal recessive condition, carrying one copy typically does not cause the disease, but you should consult with a genetic counselor regarding family planning.
This specific deletion is rare in the general population, though carrier frequencies can be significantly higher in specific founder populations like the Charlevoix-Saguenay region of Quebec.
Increased risk profile
This genotype indicates the presence of two copies of the deletion variant. This variant is classified as probable-pathogenic for autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS), a neurodegenerative condition. Please discuss these results with a medical professional or clinical geneticist to understand the clinical implications for your health.
This homozygous genotype is extremely rare in the general population.
What is the rs1057516438 Variant?
The rs1057516438 variant is a specific alteration in the human genome found within the SACS gene. In genetics, an rsID (reference SNP cluster ID) like rs1057516438 acts as a unique identifier for a specific location on a chromosome where a variation in the DNA sequence may occur. This particular variant is classified as rare, meaning it is not commonly found in the general population. When researchers study such variants, they look at how these changes in the genetic code might affect the production or function of proteins. Because this variant is linked to a specific health condition, it is often categorized under health predisposition research. Understanding where this variant sits on the gene helps scientists determine if it disrupts the normal instructions the body uses to build essential biological machinery.
The Role of the SACS Gene
The SACS gene provides instructions for creating a protein called sacsin. This protein acts as a molecular chaperone, which is a type of protein that helps other proteins fold into their correct shapes and maintain their stability. Proper protein folding is critical for the health of cells, particularly in the nervous system. Research indicates that sacsin plays a vital role in maintaining the health of neurons by regulating microtubule dynamics and supporting lysosomal function. When the SACS gene contains pathogenic variants, the resulting sacsin protein may be non-functional or absent. This disruption can lead to the accumulation of misfolded proteins or cellular stress, which is believed to contribute to the neurodegenerative symptoms observed in conditions like Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay (ARSACS).
Research and Clinical Associations
Scientific literature associates variants in the SACS gene with ARSACS, a disorder characterized by early-onset cerebellar ataxia, spasticity, and peripheral neuropathy. The evidence strength for the pathogenicity of specific SACS variants is generally considered moderate to high, depending on the specific mutation and clinical data available. Studies often identify these variants through exome sequencing in individuals presenting with progressive motor coordination issues. Because ARSACS is an autosomal recessive condition, an individual typically needs to inherit two copies of a pathogenic variant—one from each parent—to manifest the clinical symptoms. Research continues to expand the genetic spectrum of this disorder, identifying new variants in diverse populations. It is important to note that clinical findings can vary significantly between individuals, even those with similar genetic profiles, due to the complexity of neurodegenerative processes.
Population Frequency and Prevalence
The rs1057516438 variant is classified as rare across global populations. While some SACS variants have a higher carrier prevalence in specific geographic regions, such as the Charlevoix-Saguenay region of northeastern Quebec, this does not necessarily apply to every individual variant within the gene. In the general population, the likelihood of carrying this specific rare variant is very low. Genetic databases like gnomAD provide data on the frequency of variants across different ancestries, which helps researchers understand the distribution of these mutations. Because the variant is rare, large-scale population studies are often required to accurately estimate its frequency. If you have concerns about your genetic status regarding this variant, it is recommended to consult with a genetic counselor or a medical professional who can provide context based on your personal and family health history.
Interpreting Genetic Information
Information about genetic variants like rs1057516438 is intended for educational purposes and should not be used for self-diagnosis or medical decision-making. Genetic testing results can be complex, and the presence of a variant does not always guarantee the development of a specific condition, especially in the context of recessive disorders. If you have received a report indicating you carry this variant, it is essential to discuss the findings with a qualified clinician or a genetic counselor. They can help interpret the results in the context of your overall health and family history. You cannot 'fix' a genetic variant, but understanding your genetic makeup can help you and your healthcare team make informed decisions about your health management and potential screening options. Always rely on professional medical advice rather than online databases when evaluating your personal health risks.
How common is this variant?
The rs1057516438 variant is considered rare in the general population, with specific frequency data varying by ancestry in large-scale genomic databases.
Frequently asked questions
What is ARSACS?
ARSACS stands for Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay. It is a rare, inherited neurodegenerative disorder that typically causes problems with movement, muscle stiffness, and nerve damage.
Is rs1057516438 a diagnosis for a disease?
No, identifying a genetic variant is not a medical diagnosis. A diagnosis requires a clinical evaluation by a neurologist or geneticist, often involving physical exams and other diagnostic tests.
What should I do if I have this variant?
If you are concerned about a genetic finding, you should schedule an appointment with a genetic counselor or your primary care physician. They can help you understand what the result means for your health and whether further testing is appropriate.
Can I change my SACS gene sequence?
Currently, there are no medical treatments to change or 'fix' a genetic variant in your DNA. Genetic information is inherited, and medical care focuses on managing symptoms and supporting quality of life.
Sources & further reading
Educational information only, last refreshed 10/15/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs1057516438?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29Related variants in SACS
This variant in the SACS gene is documented in ClinVar and is of interest for neurological health research.
This variant in the SACS gene is associated with spastic ataxia of Charlevoix-Saguenay, which often includes retinal nerve fiber layer thickening.