SMARCB1 rs878854600: Understanding Rhabdoid Tumor Predisposition
The rs878854600 variant is a rare genetic change located within the SMARCB1 gene. This gene is primarily recognized for its role as a tumor suppressor, and variants in this region are studied for their potential association with Rhabdoid Tumor Predisposition Syndrome 1.
What each genotype means
Typical SMARCB1 profile
This genotype represents the most common sequence found in the general population for this location in the SMARCB1 gene. It is not associated with the increased risk of rhabdoid tumor predisposition syndrome described in clinical literature for this variant.
This is the predominant genotype observed across all major global populations.
Rare variant carrier
This genotype indicates the presence of a rare variant in the SMARCB1 gene. While SMARCB1 variants can be linked to rhabdoid tumor predisposition syndrome, the clinical significance of this specific variant is currently limited and requires professional genetic counseling to interpret in the context of personal and family medical history.
This genotype is extremely rare and is not typically found in standard population frequency databases.
Rare variant homozygous
This genotype indicates the presence of two copies of a rare variant in the SMARCB1 gene. Because this variant is very rare, there is limited clinical data to determine its specific impact on health, and it should be discussed with a medical geneticist to understand its relevance to your health profile.
This genotype is exceptionally rare and has not been documented as a common occurrence in human populations.
What is the rs878854600 Variant?
The rs878854600 variant is a specific single nucleotide polymorphism (SNP) found within the SMARCB1 gene. In genomics, a SNP represents a variation at a single position in the DNA sequence among individuals. This particular variant is located on chromosome 22, specifically within the 22q11.23 region, which houses the SMARCB1 gene. Because the human genome is vast, researchers use rsIDs (reference SNP identification numbers) like rs878854600 to precisely track and study these specific locations. While many variants in the human genome are common and have no impact on health, others are rare and are investigated for their potential to alter how genes function. The study of such variants is essential for understanding the genetic architecture of rare diseases and the fundamental mechanisms of cell regulation.
The Role of the SMARCB1 Gene
The SMARCB1 gene provides instructions for making a protein known as BAF47, which is a core component of the SWI/SNF chromatin remodeling complex. This complex acts like a molecular machine that changes the structure of chromatin—the combination of DNA and proteins that makes up chromosomes. By remodeling chromatin, the SWI/SNF complex controls the accessibility of DNA, thereby regulating the activation or repression of various genes. Because it influences the expression of genes involved in cell growth and division, SMARCB1 functions as a critical tumor suppressor. When this protein is absent or dysfunctional, cells may lose their ability to regulate their own growth, potentially leading to the uncontrolled proliferation characteristic of tumor development. This gene is ubiquitously expressed, meaning it is active in nearly all tissues throughout the body.
Research and Clinical Associations
Research has established that germline mutations in SMARCB1 are the primary cause of Rhabdoid Tumor Predisposition Syndrome 1 (RTPS1). This is a rare condition that increases the risk of developing highly aggressive tumors, particularly in infants and young children. The evidence for SMARCB1's role in these tumors is strong, as the vast majority of malignant rhabdoid tumors show a loss of functional SMARCB1 protein. However, the evidence specifically linking the rs878854600 variant to clinical outcomes is currently limited. In genetic research, 'limited evidence' means that while the gene itself is clearly implicated in disease, the specific functional impact of this individual variant may not yet be fully characterized or validated in large-scale clinical studies. Scientists continue to investigate how specific variants within this gene contribute to the spectrum of disease, ranging from rhabdoid tumors to other conditions like schwannomatosis.
Population Frequency and Interpretation
The rs878854600 variant is classified as very rare in the general population. In genetics, rarity often complicates the ability to draw definitive conclusions about a variant's effect, as there are fewer individuals to study. When a variant is extremely uncommon, it is difficult to determine if it is a benign change or a pathogenic one without extensive family studies or functional laboratory testing. Because this variant is associated with a gene linked to tumor predisposition, it is categorized as a 'higher-attention' variant in clinical research contexts. It is important to note that the presence of a rare variant does not automatically imply a diagnosis or a guaranteed health outcome. Genetic testing results should always be interpreted by a qualified genetic counselor or medical professional who can place the finding in the context of an individual's personal and family medical history.
What You Can Do With This Information
If you have received information about this variant, the most important step is to consult with a healthcare provider, such as a medical geneticist or a genetic counselor. They are trained to interpret complex genetic data and can explain what this finding means for you or your family. You should never use genetic information to make independent medical decisions or to diagnose yourself. If this variant was identified as part of a clinical test, your doctor may discuss whether further testing is necessary or if specific surveillance is appropriate based on your clinical presentation. Remember that genetic variants are only one piece of the puzzle; environmental factors and other genetic influences also play significant roles in health. Always rely on professional medical guidance when navigating the implications of genetic test results.
How common is this variant?
The rs878854600 variant is documented as very rare across all major ancestral populations in global genetic databases.
Frequently asked questions
Is rs878854600 a cause of cancer?
The SMARCB1 gene is a known tumor suppressor, and mutations in it are associated with rhabdoid tumors. However, the specific impact of the rs878854600 variant requires clinical interpretation by a professional to determine its significance in an individual case.
What should I do if I have this variant?
If you have identified this variant through genetic testing, you should schedule an appointment with a genetic counselor or a medical geneticist. They can help you understand the results in the context of your personal and family health history.
Is this variant inherited?
Yes, variants in the SMARCB1 gene can be inherited in an autosomal dominant pattern. This means that a single copy of the variant is sufficient to potentially increase the risk of a condition, though many cases are also de novo, meaning they occur for the first time in an individual.
Where can I find more information about SMARCB1?
You can find reliable information about the SMARCB1 gene and related conditions on resources like MedlinePlus Genetics and the OMIM (Online Mendelian Inheritance in Man) database.
Sources & further reading
Educational information only, last refreshed 10/16/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Pathogenic variant associated with Rhabdoid tumor predisposition syndrome 1.
Pathogenic variant associated with Rhabdoid tumor predisposition syndrome 1.
Pathogenic variant associated with Rhabdoid tumor predisposition syndrome 1.