MSH2 rs397514716: Understanding Lynch Syndrome Associations
The rs397514716 variant is located within the MSH2 gene, which plays a critical role in the body's DNA mismatch repair system. This variant is associated with Lynch syndrome, a condition that increases the lifetime risk of developing certain cancers, including colorectal and endometrial adenocarcinomas.
What each genotype means
Typical MSH2 gene profile
This genotype represents the common, non-variant form of the MSH2 gene. It is not associated with the increased cancer risks characteristic of Lynch syndrome. Individuals with this profile do not carry the specific pathogenic variant described in this record.
This is the most common genotype found in the general population.
Increased Lynch syndrome risk
This genotype indicates the presence of one copy of the pathogenic variant, which is associated with Lynch syndrome. Carriers have a significantly higher lifetime risk for colorectal, endometrial, and other associated cancers compared to the general population. Please discuss these findings and appropriate cancer screening strategies with a genetic counselor or your healthcare provider.
This genotype is extremely rare, with a minor allele frequency reported as less than 0.00005 in global population databases.
High risk of cancer
This genotype indicates the presence of two copies of the pathogenic variant, which may lead to constitutional mismatch repair deficiency. This condition is associated with a very high risk for early-onset colorectal, brain, and hematologic malignancies. It is essential to consult with a medical geneticist or oncologist to discuss clinical implications and management.
This genotype is exceptionally rare and is not typically observed in general population cohorts.
What is the MSH2 Gene?
The MSH2 gene provides instructions for making a protein that is essential for the DNA mismatch repair (MMR) system. During DNA replication, errors can occur when the cell copies its genetic material. The MSH2 protein acts as a molecular proofreader, forming complexes with other proteins to identify and fix these mismatched bases. By correcting these errors, MSH2 helps maintain the stability of the genome and prevents the accumulation of mutations that could lead to uncontrolled cell growth. When the MSH2 gene contains a pathogenic variant, the resulting protein may be non-functional or absent, leading to a deficiency in the repair process. This deficiency allows errors to persist and accumulate, which is a hallmark of Lynch syndrome and can significantly increase the risk of developing various cancers.
Understanding the rs397514716 Variant
The rs397514716 variant is a specific change in the DNA sequence of the MSH2 gene. In the context of genetic research, variants are classified based on their potential impact on protein function. Pathogenic variants in MSH2 are known to disrupt the normal function of the mismatch repair system. Because MSH2 is involved in such a fundamental cellular process, alterations in its sequence can have significant clinical implications. Research into this specific variant focuses on how it affects the stability of the MSH2 protein and its ability to interact with other repair proteins. While some variants are benign and have no effect on health, those classified as pathogenic are linked to an increased susceptibility to cancer. It is important to note that the presence of a variant does not guarantee the development of disease, but rather indicates a higher statistical risk that warrants clinical attention.
Clinical Associations and Evidence
The association between MSH2 variants and Lynch syndrome is well-established in medical literature. Lynch syndrome is an autosomal dominant condition, meaning that inheriting a single copy of a pathogenic variant from one parent is sufficient to increase cancer risk. Individuals with this condition have a higher lifetime risk of colorectal, endometrial, and other cancers. The evidence for specific variants like rs397514716 is often derived from clinical databases like ClinVar, which aggregate reports from genetic testing laboratories and research studies. While the evidence for some variants is robust, for others, it may be limited or classified as a variant of uncertain significance. Clinicians use this information to guide screening protocols, such as more frequent colonoscopies or other surveillance measures, to detect potential issues early. Always consult with a genetic counselor or medical professional to interpret how specific genetic findings apply to your personal health history.
Population Frequency and Prevalence
The rs397514716 variant is considered rare in the general population. According to data from the Genome Aggregation Database (gnomAD), the minor allele frequency (MAF) for this variant is extremely low, typically reported as less than 0.00005. This rarity is consistent with many pathogenic variants associated with hereditary cancer syndromes, which are not common in the general public. Because the variant is so infrequent, it is rarely encountered in the general population outside of families with a known history of Lynch syndrome. Population-level studies continue to refine these frequency estimates, helping researchers understand the global distribution of these variants. Understanding the frequency of such variants is essential for public health initiatives and for improving the accuracy of genetic screening programs, ensuring that individuals at higher risk can be identified and provided with appropriate medical guidance.
What You Can Do With This Information
If you have received information about a variant like rs397514716, the most important step is to discuss the results with a qualified healthcare provider, such as a genetic counselor or an oncologist. Genetic information is complex, and its clinical relevance depends on your personal and family medical history. A professional can help you understand whether the variant is considered pathogenic, likely pathogenic, or of uncertain significance, and what that means for your health. They can also explain the implications for your family members, who may also be at risk. Do not make medical decisions based solely on raw genetic data. Instead, use this information as a tool to facilitate a conversation with your doctor about appropriate screening, surveillance, or lifestyle modifications. Remember that genetic testing is only one piece of the puzzle, and clinical context is always required to make informed health decisions.
How common is this variant?
The rs397514716 variant is rare, with a minor allele frequency (MAF) reported in gnomAD as less than 0.00005.
Frequently asked questions
What is Lynch syndrome?
Lynch syndrome is an inherited condition that increases the risk of developing several types of cancer, most notably colorectal and endometrial cancer. It is caused by mutations in genes involved in the DNA mismatch repair system, such as MSH2.
Does having an MSH2 variant mean I will get cancer?
No, having a pathogenic MSH2 variant does not mean you will definitely develop cancer. It indicates an increased lifetime risk, which is why doctors often recommend increased cancer screening and surveillance for individuals with these variants.
How is Lynch syndrome inherited?
Lynch syndrome is inherited in an autosomal dominant pattern. This means that an individual only needs to inherit one copy of a pathogenic variant from one parent to have an increased risk of developing the associated cancers.
Should I get tested for MSH2 variants?
Genetic testing for MSH2 variants is typically recommended for individuals with a strong family history of colorectal or endometrial cancer. You should discuss the benefits and limitations of testing with a genetic counselor or your doctor.
What is the role of the MSH2 protein?
The MSH2 protein is a key component of the DNA mismatch repair system. It helps identify and fix errors that occur when DNA is copied during cell division, preventing the accumulation of mutations.
Sources & further reading
Educational information only, last refreshed 10/9/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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