ERCC2 rs13181: Understanding DNA Repair and Genetic Variation
The rs13181 variant is a common polymorphism located within the ERCC2 gene, which plays a critical role in the body's DNA repair mechanisms. Research has investigated its potential association with variations in DNA repair capacity and altered risk profiles for certain types of cancer.
What each genotype means
Typical DNA repair capacity
This genotype is often considered the reference or wild-type form in many studies. Research suggests individuals with this genotype may have standard DNA repair efficiency compared to those carrying the C allele. Associations with cancer risk are inconsistent across different populations and studies, so this result should not be interpreted as a specific health status.
This is a common genotype found globally, though frequencies vary significantly by ancestral background.
Varied DNA repair efficiency
This heterozygous genotype involves one copy of the variant allele often referred to as Lys751Gln. Some research indicates that carrying this allele may be linked to altered DNA repair capacity or modified cancer risk in certain populations, though findings remain conflicting and context-dependent. If you are undergoing platinum-based chemotherapy, please discuss the potential implications of your DNA repair profile with your oncologist or pharmacist.
This genotype is frequently observed in many populations, with prevalence rates differing between European, Asian, and other ancestral groups.
Reduced DNA repair capacity
This genotype, sometimes referred to as the Gln/Gln variant, has been associated in some studies with lower DNA repair capacity and potentially prolonged cell cycle phases. While some meta-analyses suggest an increased risk for certain cancers in specific populations, other studies have found no significant association. If you are receiving platinum-based chemotherapy, please consult your clinician or pharmacist regarding how your genetic profile might influence treatment response.
This genotype is less common than the AA or AC forms, with its frequency varying notably across different global populations.
What is the rs13181 Variant?
The rs13181 variant is a single nucleotide polymorphism (SNP) found in the ERCC2 gene. In scientific literature, this specific change is often referred to as the Lys751Gln polymorphism, reflecting an amino acid substitution where lysine is replaced by glutamine at position 751. This change occurs due to an A to C substitution in the DNA sequence. Because this variant is located in the coding region of the gene, it has been the subject of extensive study to determine if it alters the function of the protein it encodes. As a common variant, it is present in a significant portion of the global population, making it a frequent target for researchers investigating how subtle genetic differences might influence individual health outcomes, particularly regarding how cells manage and repair damage to their genetic material.
The Role of the ERCC2 Gene
The ERCC2 gene, also known as XPD, provides instructions for making a protein that is a subunit of the TFIIH complex. This complex is essential for two major cellular processes: transcription, which is the first step in protein production, and nucleotide excision repair (NER). The NER pathway is the body's primary mechanism for fixing DNA damage caused by environmental factors, such as ultraviolet (UV) radiation from sunlight and various toxic chemicals. By identifying and removing damaged segments of DNA, the ERCC2 protein helps maintain genomic stability. When the ERCC2 gene functions optimally, it ensures that cells can effectively repair mutations before they lead to harmful consequences. Variations in this gene, such as rs13181, are studied to see if they might reduce the efficiency of this repair process, potentially leaving cells more vulnerable to accumulated DNA damage over time.
Research and Associations
Scientific research into rs13181 has produced a complex and sometimes conflicting body of evidence. Numerous meta-analyses have explored whether this variant influences the risk of various cancers, including lung, pancreatic, and glioma, as well as responses to platinum-based chemotherapy. Some studies suggest that certain genotypes may be associated with an increased risk of specific cancers or altered sensitivity to radiation therapy, while other studies have found no significant correlation. For instance, some meta-analyses have identified potential risk associations in specific ethnic subgroups, while others have reported null results across broader populations. Because the reported effect sizes are often small and results vary significantly between different studies and populations, the evidence for a direct clinical impact remains moderate and inconclusive. It is important to recognize that cancer risk is multifactorial, involving a complex interplay of genetics, environment, and lifestyle factors.
Population Frequency
The rs13181 variant is considered a common polymorphism, meaning it is found at relatively high frequencies across diverse human populations. While specific allele frequencies can vary by ancestry, the variant is widely distributed, allowing researchers to study its effects in many different ethnic groups globally.
Interpreting Genetic Information
Understanding your genotype for rs13181 does not provide a definitive prediction of your health or future disease risk. Because the scientific evidence regarding this variant is mixed and often shows only small statistical associations, it cannot be used as a diagnostic tool. Genetic variants like rs13181 are just one piece of a much larger puzzle that includes your overall health history, lifestyle, and environmental exposures. If you are concerned about cancer risk or are undergoing medical treatments such as chemotherapy, it is essential to discuss these topics with your healthcare provider or a genetic counselor. They can provide context based on your personal medical history and help you understand how to approach your health decisions. Never use information about a single genetic variant to make medical decisions or alter prescribed treatments without professional clinical guidance.
How common is this variant?
The rs13181 variant is a common polymorphism found across diverse global populations, with varying frequencies of the A and C alleles observed among different ancestral groups.
Frequently asked questions
Is rs13181 a cause of cancer?
No, rs13181 is not a direct cause of cancer. It is a common genetic variation that researchers study to see if it might slightly influence DNA repair efficiency, which is only one of many factors that contribute to cancer risk.
Should I get tested for the ERCC2 rs13181 variant?
There is currently no clinical recommendation for the general public to be tested for this variant. Because the evidence regarding its impact is mixed and not definitive, it does not provide actionable information for routine health management.
Does this variant affect how I respond to chemotherapy?
Some research has explored whether this variant influences response to platinum-based chemotherapy, but results are inconsistent. You should always discuss your specific treatment plan and any concerns about medication response with your oncologist or pharmacist.
Can I change my DNA repair capacity?
While you cannot change your genetic code, you can support your overall health by maintaining a lifestyle that minimizes DNA damage. This includes protecting your skin from excessive UV exposure, avoiding tobacco, and eating a balanced diet, all of which help reduce the burden on your body's natural repair systems.
Sources & further reading
Educational information only, last refreshed 10/15/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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