SAMHD1 rs7265241: What Your Genotype Means
The rs7265241 variant is a single nucleotide polymorphism located within the SAMHD1 gene. Research has identified this specific variant as being significantly associated with event-free and overall survival outcomes in children diagnosed with acute myeloid leukemia.
What each genotype means
Baseline SAMHD1 variant profile
This genotype represents the common, non-variant form of the rs7265241 marker. Research indicates that individuals with this genotype do not carry the specific genetic variation associated with altered clinical outcomes in pediatric acute myeloid leukemia (AML) patients treated with Ara-C. This finding is based on statistical associations in clinical cohorts and does not predict individual health outcomes.
This is the most common genotype in most global populations, though exact frequencies vary significantly by ancestry.
Associated with AML outcomes
This genotype includes one copy of the variant allele associated with clinical outcomes in pediatric AML patients. Studies suggest this variant may influence event-free and overall survival in patients undergoing Ara-C consolidation therapy. If you or a family member are undergoing treatment for AML, please discuss the implications of this genetic marker with your oncologist or pharmacist.
This heterozygous genotype is found at varying frequencies across different ancestral groups, reflecting the population-specific distribution of the G allele.
Associated with AML outcomes
This genotype includes two copies of the variant allele associated with clinical outcomes in pediatric AML patients. Research indicates that this variant is an independent predictor of event-free and overall survival in children treated with Ara-C. Please discuss the relevance of this genetic information and its potential impact on treatment planning with your clinical care team.
This homozygous variant genotype is less common than the heterozygous form and its prevalence varies by ancestry.
Understanding the rs7265241 Variant
The rs7265241 variant is a specific change in the DNA sequence located in the 3' region of the SAMHD1 gene. In genetics, a single nucleotide polymorphism (SNP) like rs7265241 represents a variation at a single position in the DNA building blocks. While most of our DNA is identical, these small variations can influence how genes function or how proteins are produced. Scientists study these markers to understand why individuals may respond differently to diseases or medical treatments. The rs7265241 variant is particularly notable because it has been identified through large-scale clinical trials as a potential marker for predicting how pediatric patients with acute myeloid leukemia (AML) might fare during their treatment journey. By analyzing this specific location in the genome, researchers aim to better understand the biological factors that contribute to the variability in survival rates observed among children with this diagnosis.
The Role of the SAMHD1 Gene
The SAMHD1 gene provides instructions for making a protein that acts as a deoxynucleoside triphosphate triphosphohydrolase (dNTPase). This enzyme plays a critical role in maintaining the balance of dNTPs, which are the essential building blocks required for DNA synthesis and repair within cells. Beyond its role in DNA maintenance, SAMHD1 is recognized for its ability to restrict certain viral infections, such as HIV-1, by depleting the dNTP pool that viruses need to replicate. In the context of cancer, SAMHD1 has also been studied for its involvement in how cells process chemotherapy drugs, specifically Ara-C (cytarabine). Because the protein can influence the inactivation of these drugs, variations in the SAMHD1 gene may affect how effectively a treatment works. Mutations in this gene are also linked to Aicardi-Goutières syndrome, a rare condition affecting the brain and immune system, highlighting the gene's importance in overall cellular health.
Research and Clinical Associations
The evidence linking rs7265241 to clinical outcomes in pediatric AML is considered moderate and stems from multi-cohort studies. Research published in journals such as the American Society of Hematology's Blood has shown that this variant, along with others in the same gene, is associated with differences in event-free survival and overall survival in children with newly diagnosed AML. The association is thought to be tied to the gene's influence on the metabolism of Ara-C, a common chemotherapy agent. While these findings are statistically significant, they are currently used in a research context to better understand drug resistance and treatment response. It is important to note that these associations do not imply that the variant is the sole cause of a patient's outcome. Many factors, including other genetic markers and clinical variables, contribute to the prognosis of leukemia. Further validation in larger, diverse patient populations is necessary to determine how this information might eventually be integrated into clinical practice.
What This Information Means for You
If you or a loved one are navigating a diagnosis of acute myeloid leukemia, it is essential to understand that genetic variants like rs7265241 are tools for researchers, not diagnostic tests for individuals. This information is intended for educational purposes and should not be used to make personal health decisions or to predict individual outcomes. The field of pharmacogenomics is rapidly evolving, and while markers like SAMHD1 show promise in explaining why patients respond differently to therapy, clinical care is guided by a comprehensive assessment of many factors by your oncology team. If you have questions about genetic testing or how specific genetic markers might relate to a treatment plan, please discuss these with your clinician or a specialized pharmacist. They are the best resources for interpreting how current research applies to a specific medical situation and can provide guidance based on the most up-to-date clinical standards.
How common is this variant?
The frequency of the rs7265241 variant varies significantly across different ancestral populations. Detailed allele frequency data can be found in public databases like gnomAD, which aggregate genomic information from diverse global cohorts.
Frequently asked questions
Is rs7265241 a diagnostic test for leukemia?
No, rs7265241 is not a diagnostic test for leukemia. It is a genetic variant that researchers study to understand how different people might respond to chemotherapy treatments, but it is not used to diagnose the presence of cancer.
Can I change my SAMHD1 genotype?
No, your genotype is determined by the DNA you inherit from your parents and cannot be changed. Genetic variants are permanent features of your biological makeup.
Should I get tested for this variant?
Genetic testing for specific variants like rs7265241 is typically performed in the context of clinical research or specialized medical care. You should discuss the relevance of any genetic testing with your oncologist or a genetic counselor to see if it is appropriate for your specific situation.
Where can I find more information on SAMHD1?
You can find reliable information about the SAMHD1 gene through resources like MedlinePlus Genetics or the NCBI Gene database. These sites provide comprehensive summaries of gene functions and their roles in human health.
Sources & further reading
Educational information only, last refreshed 10/3/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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