MYH7 rs199472918: Understanding This Rare Genetic Variant
The rs199472918 variant is a rare genetic change located within the MYH7 gene. It is categorized as a pathogenic mutation associated with hypertrophic cardiomyopathy, a condition involving the thickening of the heart muscle.
What each genotype means
Typical MYH7 genetic profile
This genotype represents the common, non-variant form of the MYH7 gene at this specific location. It is not associated with the pathogenic changes linked to hypertrophic cardiomyopathy described for this variant. Individuals with this genotype do not carry the specific mutation identified in the catalog.
This is the most common genotype found in the general population across all ancestries.
Pathogenic variant carrier
This genotype indicates the presence of a pathogenic mutation in the MYH7 gene, which is associated with an increased risk of developing hypertrophic cardiomyopathy. Because this condition can exhibit variable penetrance, carrying this variant does not guarantee the development of clinical disease, but it warrants consultation with a cardiologist for appropriate screening and long-term cardiovascular monitoring.
This specific genotype is rare in the general population, as pathogenic variants in MYH7 are typically found in less than 1% of individuals.
Pathogenic variant homozygous
This genotype indicates that both copies of the MYH7 gene carry the pathogenic mutation. While most MYH7-related cardiomyopathy follows an autosomal dominant pattern, individuals with this genotype may face a significantly higher risk or earlier onset of cardiac symptoms compared to those with a single copy. Clinical evaluation by a specialist is strongly recommended to assess cardiac health and discuss potential management strategies.
This genotype is extremely rare in the general population.
Understanding the MYH7 Gene
The MYH7 gene provides instructions for making a protein called beta-myosin heavy chain-7. This protein is a critical component of the sarcomere, the basic unit of muscle contraction in the heart. By working alongside other proteins, beta-myosin heavy chain-7 allows cardiac muscle fibers to slide past one another, enabling the heart to pump blood effectively throughout the body. Because of its essential role in cardiac function, the MYH7 gene is highly sensitive to structural changes. When mutations occur in this gene, they can disrupt the normal assembly or function of the myosin protein, potentially leading to structural abnormalities in the heart muscle. Research has long established that variants in this gene are among the most common genetic causes of inherited cardiomyopathies, which are diseases of the heart muscle that can affect its ability to pump blood.
What is the rs199472918 Variant?
The rs199472918 variant is a specific alteration in the DNA sequence of the MYH7 gene. In genomics, an rsID (reference SNP cluster ID) acts as a unique identifier for a specific location in the human genome where a variation has been observed. This particular variant is classified as a pathogenic mutation, meaning that current scientific evidence links it to the development of disease. Specifically, it is associated with hypertrophic cardiomyopathy (HCM), a condition characterized by the thickening of the heart muscle, which can sometimes interfere with the heart's electrical system or its ability to circulate blood. Because this variant is located in a region of the gene that is critical for protein function, it is considered a high-attention finding in clinical genetics. It is important to note that the presence of a pathogenic variant does not guarantee that an individual will develop clinical symptoms, as other genetic and environmental factors often play a role.
Evidence and Clinical Significance
The evidence linking MYH7 variants to cardiomyopathy is robust, though the specific impact of any single variant like rs199472918 must be evaluated within the context of an individual's overall health. Scientific literature, including data curated by the Clinical Genome Resource (ClinGen), highlights that pathogenic variants in the head region of the MYH7 protein are statistically more likely to be associated with HCM. While the association between MYH7 mutations and heart conditions is well-documented, the clinical expression of these variants can vary significantly between individuals, even within the same family. This phenomenon, known as variable expressivity, means that some people with a pathogenic variant may show clear signs of heart muscle thickening, while others may remain asymptomatic. Because of this complexity, genetic findings should always be interpreted by a qualified medical professional, such as a cardiologist or a genetic counselor, who can integrate the genetic data with physical examinations and imaging studies.
Population Frequency and Interpretation
The rs199472918 variant is considered rare across global populations. In large-scale genomic databases like gnomAD, which aggregate data from hundreds of thousands of individuals, this variant is found at an extremely low frequency. This rarity is typical for pathogenic variants associated with severe, early-onset, or highly penetrant Mendelian conditions. Because the variant is so uncommon, it is not typically found in the general population, and its presence is usually identified during targeted clinical testing for individuals with a personal or family history of heart disease. When interpreting such rare findings, researchers look for segregation—whether the variant is present in other family members who also have the condition. If you have received information about this variant, it is essential to discuss the results with a healthcare provider. They can help determine if the finding is relevant to your health and whether further cardiac screening is appropriate for you or your relatives.
How common is this variant?
The rs199472918 variant is classified as rare, appearing at an extremely low frequency in global population databases.
Frequently asked questions
What does it mean if I have a pathogenic MYH7 variant?
A pathogenic variant in the MYH7 gene indicates a known genetic change associated with heart muscle conditions like hypertrophic cardiomyopathy. However, it does not mean you will definitely develop the condition, as clinical outcomes can vary. You should consult a cardiologist to discuss what this means for your specific health.
Is rs199472918 the same as other MYH7 mutations?
No, rs199472918 is a unique identifier for one specific location in the MYH7 gene. While many different mutations in MYH7 can cause similar heart conditions, each variant has its own specific evidence profile and clinical significance.
Should I get tested for this variant?
Genetic testing is typically recommended by a doctor if there is a personal or family history of cardiomyopathy. You should speak with a genetic counselor or a cardiologist to determine if testing is appropriate for your situation.
Can I change my risk if I have this variant?
While you cannot change your DNA, medical management can help monitor and manage the risks associated with genetic heart conditions. Regular check-ups with a heart specialist are the most effective way to manage potential health risks.
Sources & further reading
Educational information only, last refreshed 10/26/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant is a pathogenic mutation in the MYH7 gene associated with hypertrophic cardiomyopathy.
This variant is a pathogenic mutation in the MYH7 gene associated with hypertrophic cardiomyopathy.
This missense variant in MYH7 is associated with hypertrophic cardiomyopathy, specifically noted for its role in abnormal contractile protein function.
Sarcomeric beta-myosin heavy chain mutation p.Arg403Gln causing familial hypertrophic cardiomyopathy.
A well-characterized pathogenic missense substitution (p.Arg403Gln) causing familial hypertrophic cardiomyopathy with elevated risk of arrhythmia and sudden cardiac death.
This coding variant in MYH7 is cataloged in ClinVar and curated for its association with genetic predisposition to familial hypertrophic cardiomyopathy.