MRE11A rs774277300: Understanding DNA Repair and Genetic Variation
The rs774277300 variant is a rare genetic change located within the MRE11A gene. It is primarily studied for its potential role in DNA damage repair pathways and its association with hereditary cancer predisposition.
What each genotype means
Hereditary cancer predisposition
This genotype has been reported in literature as being associated with a potential hereditary cancer predisposition. Because this variant is rare, individuals with this result should consult with a genetic counselor or oncologist to discuss the clinical relevance of this finding in the context of their personal and family medical history.
This specific genotype is rare in the general population.
Increased colorectal cancer risk
Research indicates that this genotype, also known as c.1726C>T or p.Arg576Ter, is associated with an increased risk for colorectal cancer. This finding does not constitute a medical diagnosis, and you should discuss these results with a healthcare professional to determine if further screening or clinical evaluation is appropriate.
This genotype is rare across global populations.
Common variant profile
This genotype is considered a common finding in clinical databases for this location. It is not associated with the specific cancer risks linked to the C or T alleles at this position.
This is the most frequently observed genotype in clinical databases for this variant.
What is rs774277300?
The rs774277300 variant is a specific single nucleotide polymorphism (SNP) found within the MRE11A gene. This gene provides instructions for creating a protein that is a critical component of the MRN complex, which acts as an early sensor and processor of DNA damage. Because the MRE11A protein is essential for maintaining genomic integrity, researchers closely monitor variants in this region to understand how they might alter the efficiency of DNA repair. While many variants in the human genome are common, rs774277300 is classified as rare, meaning it is found in only a very small percentage of the global population. Its location within the gene is significant because changes here could theoretically impact the protein's ability to interact with other repair factors, such as RAD50 and NBS1, which are necessary for fixing double-strand breaks in DNA.
The Role of MRE11A in DNA Repair
The MRE11A gene is a cornerstone of the cellular machinery that repairs DNA. When DNA strands break, the MRN complex—which includes the MRE11A protein—is one of the first responders. It helps identify the damage and initiates the repair process, ensuring that genetic information is copied accurately during cell division. Recent research has also highlighted that MRE11A acts as a negative regulator of DNA mismatch repair, a pathway that corrects errors made during DNA replication. By competing with other proteins like PMS2 for binding to MLH1, MRE11A can influence the overall activity of the mismatch repair system. Because of these multifaceted roles, any variation in the MRE11A gene, including rs774277300, is of interest to scientists studying how cells manage stress, prevent mutations, and maintain stability over time.
Research and Clinical Associations
Scientific interest in MRE11A variants often centers on their potential link to cancer predisposition. While some truncating variants in MRE11A have been investigated for links to breast and ovarian cancer, the evidence remains complex and sometimes contradictory. Some studies suggest that certain MRE11A variants may be associated with clonal hematopoiesis or cardiovascular risk factors, rather than a direct, high-penetrance cancer risk. For rs774277300 specifically, the evidence strength is considered moderate. It is important to note that genetic associations are often population-specific, and findings in one group may not apply to others. Because the research is ongoing, it is not currently possible to definitively state the clinical impact of this specific variant. Researchers continue to use functional assays and large-scale genomic studies to clarify whether this variant significantly alters DNA repair capacity or contributes to specific disease phenotypes.
Interpreting Your Genetic Information
If you have information about your status for rs774277300, it is important to understand that this data is for educational purposes only. Genetic variants do not act in isolation; they interact with other genes, environmental factors, and lifestyle choices to influence health. Having a rare variant does not mean you will develop a specific condition, nor does the absence of one guarantee protection. You cannot use this information to diagnose yourself or make medical decisions. If you are concerned about your family history of cancer or other health conditions, the most appropriate step is to consult with a certified genetic counselor or a healthcare professional. They can help you interpret your results in the context of your overall health and provide guidance on whether clinical genetic testing or screening is appropriate for your specific situation.
How common is this variant?
The rs774277300 variant is considered rare, with a low frequency across most global populations.
Frequently asked questions
Is rs774277300 a cancer-causing mutation?
Current research does not classify rs774277300 as a direct cause of cancer. While MRE11A is involved in DNA repair, the link between specific rare variants and cancer risk is often complex and not fully established.
Should I be worried if I have this variant?
Finding a rare variant in your genetic data does not necessarily mean you have an increased health risk. Many rare variants have no significant impact on health, and you should discuss any concerns with a medical professional.
How can I find out if this variant affects my DNA repair?
There is no standard clinical test to measure the functional impact of a single SNP on your DNA repair capacity. Research studies use specialized laboratory assays, but these are not typically available for routine clinical use.
Where can I get more information about MRE11A?
You can find reliable information about genes and variants through resources like MedlinePlus Genetics or the NCBI ClinVar database. These sites provide curated information on the clinical significance of genetic findings.
Sources & further reading
Educational information only, last refreshed 11/4/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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