rs187843643: Understanding This Melanoma-Associated Genetic Variant
The rs187843643 variant is a single nucleotide polymorphism (SNP) located in an intergenic region of the human genome. It has been identified in genome-wide association studies as a potential susceptibility locus associated with an increased risk of developing melanoma.
What each genotype means
Typical genetic profile
This genotype represents the most common genetic state at this location. Research has identified this variant as a potential susceptibility locus for melanoma, but the clinical significance of carrying the common allele remains limited and requires further study.
This is the most frequently observed genotype across global populations.
Variant carrier
You carry one copy of the variant allele associated with melanoma risk in some genome-wide association studies. Because the evidence for this association is limited, this finding should not be interpreted as a diagnostic indicator of disease risk.
This genotype is rare in the general population.
Variant carrier
You carry two copies of the variant allele identified in studies exploring melanoma susceptibility. Current evidence is limited, and the specific impact of this genotype on individual health outcomes is not well-established.
This genotype is very rare in the general population.
What is rs187843643?
A single nucleotide polymorphism, or SNP, is a variation at a single position in a DNA sequence among individuals. The variant rs187843643 is located on chromosome 5 at position 17,453,974. Because it is described as intergenic, this means the variant sits in the non-coding DNA between genes rather than within a gene that provides instructions for making a protein. While intergenic regions were once considered 'junk DNA,' modern research has shown that these areas often contain regulatory elements that control how nearby genes are turned on or off. Scientists study these variants to understand how subtle changes in the non-coding genome might influence complex biological traits or disease susceptibility. In the case of rs187843643, its specific location on chromosome 5 has been the subject of investigation to determine if it plays a role in the regulatory landscape of skin health and cancer development.
The Role of Genetics in Melanoma
Melanoma is a complex disease influenced by both environmental factors, such as ultraviolet (UV) radiation exposure, and inherited genetic factors. Genome-wide association studies (GWAS) are powerful tools that scan the entire genome to find common and rare variants that occur more frequently in people with a specific condition compared to those without it. Research has identified numerous loci associated with melanoma, many of which are involved in pathways related to pigmentation, nevus (mole) count, DNA repair, and telomere maintenance. While many of these associations are well-established, others, like rs187843643, are considered novel or limited-evidence loci. Identifying these variants helps researchers build a more complete map of the genetic architecture of melanoma. However, it is important to note that having a variant associated with a disease does not mean an individual will develop that disease; rather, it suggests a statistical correlation that warrants further scientific study.
Evidence and Research Context
The evidence linking rs187843643 to melanoma is currently classified as limited. This variant was highlighted in a two-stage genome-wide association study that sought to identify new susceptibility loci. In such studies, a 'discovery' phase identifies potential candidates, and a 'replication' phase attempts to confirm those findings in a different group of people. Because the association for this specific variant is based on limited data, it is not yet considered a definitive clinical marker for melanoma risk. Furthermore, genetic associations can be highly dependent on the ancestry of the study participants. Most large-scale GWAS have historically focused on populations of European ancestry, which may limit the generalizability of these findings to other global populations. As more diverse genomic data becomes available, the scientific community will be better equipped to determine the true impact of this variant across different ethnic and geographic groups.
Population Frequency
The rs187843643 variant is characterized as rare in the general population. Because it is rare, it is not frequently observed in standard genomic databases, which makes it more challenging for researchers to calculate precise risk estimates or determine its prevalence across diverse ancestral backgrounds. When a variant is rare, the statistical power to detect a significant association with a disease is lower, which contributes to the 'limited' evidence strength often cited in genetic catalogs. Researchers rely on large-scale biobanks and international collaborations to aggregate enough data to study these infrequent variants effectively. For the average person, the rarity of this variant means it is unlikely to be a primary driver of disease risk compared to well-known, high-impact genetic mutations or significant environmental exposures like sun damage.
What This Information Means for You
If you have encountered this variant in a personal genetic report, it is essential to interpret the information with caution. Genetic associations identified in research studies are statistical observations made at the population level; they are not diagnostic tools for individuals. Having a variant associated with a trait does not guarantee that you will develop that trait, nor does the absence of the variant guarantee protection. You cannot use this information to diagnose yourself or to make medical decisions. If you are concerned about your risk for melanoma, the most effective steps involve clinical screening, such as regular skin examinations by a dermatologist, and practicing sun safety. Always discuss any questions regarding your genetic results or personal health risks with a qualified healthcare provider or a genetic counselor who can provide context based on your full medical and family history.
How common is this variant?
The rs187843643 variant is considered rare across most populations, with limited data available to determine precise frequency differences between ancestral groups.
Frequently asked questions
Does having the rs187843643 variant mean I will get melanoma?
No. This variant is only associated with a statistical increase in risk at the population level. It is not a diagnostic test, and many people with this variant will never develop melanoma.
Where can I find more information about this SNP?
You can look up the rsID on the NCBI dbSNP database or the GWAS Catalog. These resources provide technical details and links to the original research papers that identified the variant.
Should I change my medical care based on this genetic result?
You should never change your medical care based on a single genetic variant. Always consult with a dermatologist or primary care physician to discuss your personal risk factors and appropriate screening schedules.
Why is the evidence for this variant called 'limited'?
Evidence is labeled as limited when the association has not been consistently replicated in large, diverse studies or when the statistical significance is not strong enough to be considered definitive. This indicates that more research is needed to confirm the finding.
Sources & further reading
Educational information only, last refreshed 9/30/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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