BRCA1 rs28897672: Understanding This Genetic Variant
The rs28897672 variant is a specific change within the BRCA1 gene that has been studied for its potential impact on cancer susceptibility. It is categorized as a rare genetic variant, and research into its clinical significance is ongoing.
What each genotype means
Typical BRCA1 profile
This is the most common genotype for this position in the BRCA1 gene. Research suggests this represents the baseline sequence, and it is not associated with the specific ovarian cancer risk linked to the rare G allele in some populations.
This is the most frequent genotype observed in the general population.
Potential protective association
This genotype involves one copy of the rare G allele. Some research in specific populations has observed that this combination may be associated with a protective effect against ovarian cancer, though these findings are limited to specific study groups and require further validation.
This genotype is rare and observed primarily in specific research cohorts.
Rare variant carrier
This genotype carries two copies of the rare G allele, also known as c.181T>G or Cys61Gly. While some sources have flagged this variant as potentially pathogenic for breast or ovarian cancer, clinical evidence remains mixed and is often based on limited data; you should discuss these findings with a genetic counselor or clinician.
This genotype is very rare in the general population.
Rare variant carrier
This genotype includes the rare A allele. While some databases have flagged this as potentially pathogenic, this classification is based on limited evidence from single submitters and its clinical significance remains uncertain.
This genotype is extremely rare.
Rare variant carrier
This genotype includes the rare C allele. Similar to other non-T alleles at this position, some reports have suggested potential pathogenicity, but current evidence is insufficient to confirm a definitive clinical impact.
This genotype is extremely rare.
What is rs28897672?
The rs28897672 variant is a single nucleotide polymorphism (SNP) located within the BRCA1 gene on chromosome 17. In genetic databases, this variant represents a specific position where the DNA sequence can differ between individuals. Because the BRCA1 gene is large and complex, researchers track thousands of such variants to understand how they might influence biological processes. While some variants in this gene are well-understood, others, like rs28897672, are classified as rare. Identifying these variants requires large-scale genomic sequencing projects that compare the DNA of many individuals. When a variant is identified, scientists look for patterns to see if it appears more frequently in people with specific health conditions compared to the general population. Because this variant is rare, it is not typically included in standard, broad-spectrum genetic screening panels, and its presence is often only identified through targeted or comprehensive clinical genetic testing.
The Role of the BRCA1 Gene
The BRCA1 gene, which stands for Breast Cancer gene 1, provides instructions for making a protein that acts as a tumor suppressor. This protein is essential for maintaining the stability of a cell's genetic information by repairing damaged DNA. When DNA damage occurs, the BRCA1 protein helps coordinate the repair process, ensuring that cells do not replicate with errors that could lead to uncontrolled growth. If the BRCA1 gene contains a variant that disrupts the production or function of this protein, the cell's ability to repair its DNA is compromised. This can lead to the accumulation of further genetic mutations, which may increase the risk of developing certain types of cancer, particularly breast and ovarian cancer. The gene is a critical component of the body's natural defense system against cancer, and its function is highly conserved across human populations.
Research and Evidence Strength
Research into rs28897672 is grounded in studies that examine the link between specific BRCA1 variants and cancer risk. Evidence for this variant is considered moderate, meaning that while there are associations observed in research settings, the clinical interpretation can be complex. In the context of genetic research, an association does not necessarily mean that a variant directly causes a disease; rather, it suggests that the variant may be a marker for increased risk or may interact with other genetic and environmental factors. Scientists use various methods, including functional assays and large-scale population studies, to determine if a variant is pathogenic. Because the evidence for many rare variants is still evolving, clinical laboratories often classify them based on the strength of the available data. It is important to note that scientific understanding of such variants is constantly updated as more data becomes available through global genomic research initiatives.
Population Frequency
The rs28897672 variant is classified as rare, meaning it is found in a very small percentage of the general population. Genetic frequency can vary significantly depending on ancestral background, and some variants are found more frequently in specific ethnic or geographic groups due to historical population patterns. Because this variant is rare, it is not commonly encountered in the general population, and its frequency is often too low to be accurately captured in standard, small-scale studies. Large-scale databases like gnomAD are used by researchers to estimate how often these variants appear across diverse global populations. When a variant is rare, it is often difficult to establish a definitive risk profile because there are fewer individuals with the variant to study. Consequently, researchers must rely on collaborative efforts and international data sharing to build a more accurate picture of its prevalence and potential health implications.
Interpreting Your Genetic Information
If you have received information about the rs28897672 variant, it is essential to understand that this information should not be used for self-diagnosis. Genetic variants are only one piece of a much larger puzzle that includes family history, lifestyle, and other environmental factors. You cannot determine your personal health risk based on a single variant alone. If you are concerned about your genetic profile, the most appropriate step is to consult with a certified genetic counselor or a healthcare provider who specializes in genetics. They can help interpret your results in the context of your personal and family medical history. They can also explain the limitations of current research and discuss whether further clinical testing or specialized screening is appropriate for your situation. Never make medical decisions, such as pursuing prophylactic surgery or changing your health screening schedule, without professional medical guidance.
How common is this variant?
The rs28897672 variant is considered rare across most global populations, appearing at a very low frequency in genomic databases.
Frequently asked questions
Is rs28897672 a cause of cancer?
Genetic variants are often associated with risk rather than acting as a direct cause. While some BRCA1 variants are linked to higher cancer risk, the presence of a single variant does not guarantee that an individual will develop cancer.
Should I get tested for this variant?
Genetic testing is typically recommended based on personal or family history of cancer. You should discuss the necessity of testing with a healthcare provider or genetic counselor to determine if it is appropriate for your specific situation.
What should I do if I have this variant?
If you have been identified as a carrier of this variant, consult with a genetic counselor or a specialist. They can provide personalized guidance based on your medical history and the latest clinical guidelines.
Where can I find more information about BRCA1 variants?
Reliable information can be found through resources like MedlinePlus Genetics, ClinVar, and the National Cancer Institute. These organizations provide evidence-based information on genetic variants and their clinical significance.
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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This variant is a splice site mutation in the BRCA1 gene associated with hereditary breast and ovarian cancer syndrome.
This is a well-established pathogenic variant in the BRCA1 gene associated with increased hereditary breast and ovarian cancer risk.
This pathogenic variant is strongly associated with an increased lifetime risk of breast and ovarian cancer.
This SNP is a known marker investigated for its potential role in breast and ovarian cancer susceptibility.
This variant is one of several SNPs that cumulatively contribute to a slightly increased risk for breast cancer in carriers.
This variant is associated with hereditary breast and ovarian cancer syndrome.