CAV3 rs1008642: Understanding This Genetic Variant
The rs1008642 variant is a single-nucleotide polymorphism located on chromosome 3. It has been identified in clinical databases in association with a range of conditions, including certain types of muscular dystrophy and cardiovascular phenotypes.
What each genotype means
Common genetic profile
This genotype represents the most frequently observed sequence at this location in many global populations. Current research does not indicate that carrying this specific pair of alleles significantly alters your risk for muscular conditions compared to the general population.
This is the most common genotype found across most major ancestral groups.
Common genetic profile
Carrying one copy of each allele is a common variation observed in many individuals. There is no strong evidence suggesting that this specific combination of alleles confers a distinct clinical risk for muscular dystrophy or related myopathies.
This heterozygous genotype is found at moderate frequencies in diverse populations worldwide.
Common genetic profile
This genotype is a standard variation at this genomic position. While this variant has been studied in the context of muscular conditions, current evidence does not support a direct or high-impact association between this specific genotype and the development of clinical symptoms.
This genotype is observed at varying frequencies depending on ancestral background, but is generally considered a common variant.
What is rs1008642?
The rs1008642 variant is a single-nucleotide polymorphism (SNP), which is a variation at a single position in the DNA sequence. This specific SNP is located on chromosome 3 at position 8,733,975 (GRCh38). While often categorized as an intergenic variant, it is situated in close proximity to the CAV3 gene, which encodes the protein caveolin-3. Caveolin-3 is a primary structural component of the caveolae membranes in muscle cells. Because of its location, researchers often investigate this variant when studying the function of the CAV3 gene and its potential role in muscle-related health. Genetic variants like rs1008642 are identified through large-scale genomic studies and clinical reporting, where researchers look for patterns in DNA that correlate with specific physical traits or health conditions.
The Role of the CAV3 Gene
The CAV3 gene provides instructions for making the caveolin-3 protein. This protein is essential for the formation of caveolae, which are small, flask-shaped indentations on the surface of muscle cells. These structures are involved in various cellular processes, including signal transduction and the maintenance of muscle cell membrane integrity. When the CAV3 gene is altered, it can affect the stability and function of these membranes. Because muscle tissue relies heavily on these structures for proper contraction and signaling, mutations or variations in or near this gene are frequently studied in the context of neuromuscular disorders. Understanding how variants like rs1008642 might influence the expression or regulation of nearby genes is a major focus of ongoing research in human genetics.
Research and Clinical Associations
The rs1008642 variant has been documented in clinical databases such as ClinVar, where it is linked to a variety of conditions including distal myopathy, limb-girdle muscular dystrophy, and certain cardiovascular phenotypes like long QT syndrome and hypertrophic cardiomyopathy. It is important to note that the evidence strength for these associations is considered moderate. In genetic research, an association does not necessarily mean that the variant causes the condition; rather, it suggests that the variant is statistically more common in individuals with these traits compared to the general population. Because many of these conditions are complex and can be influenced by multiple genetic and environmental factors, the presence of this variant alone is not a diagnostic indicator. Clinical interpretation of such variants requires careful consideration by medical professionals.
Population Frequency
The rs1008642 variant is relatively common in the general population. According to data from sources like ClinVar and various genomic databases, the Global Minor Allele Frequency (GMAF) is approximately 0.368. This means that a significant portion of the population carries at least one copy of the alternative allele. Because it is a common variant, it is frequently observed in individuals who do not exhibit the specific muscular or cardiovascular conditions mentioned in clinical literature. This high frequency underscores the complexity of genetic associations, as common variants often have small individual effects on health outcomes. Researchers use this frequency data to help distinguish between rare, highly penetrant mutations that cause disease and common variations that may only slightly modify risk or have no clinical impact at all.
What You Can Do With This Information
Information about genetic variants like rs1008642 is primarily intended for educational and research purposes. If you have received a report identifying this variant in your own genome, it is important to remember that it is not a medical diagnosis. Genetic associations are statistical observations made across large groups of people and cannot predict individual health outcomes with certainty. You should never use this information to make decisions about your health, such as starting or stopping medications or changing your lifestyle, without consulting a qualified healthcare provider. If you have concerns about your family history of muscular or cardiovascular conditions, a genetic counselor or a specialist can help you interpret your results in the context of your overall health and medical history.
How common is this variant?
The rs1008642 variant is common, with a global minor allele frequency of approximately 0.368.
Frequently asked questions
Is rs1008642 a cause of muscular dystrophy?
The rs1008642 variant is associated with certain muscular conditions in clinical databases, but it is not considered a direct, singular cause of muscular dystrophy. Genetic associations are complex, and the presence of this variant does not guarantee the development of any disease.
Should I be worried if I have the T/T genotype?
Having a specific genotype does not mean you will develop a health condition. Because this variant is common in the general population, many people with the T/T genotype do not have any related symptoms. Always discuss your genetic results with a healthcare professional.
Where can I find more information about my genetic results?
If you have questions about your genetic data, the best resource is a certified genetic counselor. They can help you understand the clinical significance of your results and how they relate to your personal and family medical history.
Does this variant affect how I should take my medication?
There is no current evidence suggesting that rs1008642 dictates specific medication dosing. If you have concerns about your medications, please consult your doctor or pharmacist before making any changes.
Sources & further reading
Educational information only, last refreshed 10/6/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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