COL17A1 rs118594078: What Your Genotype Means
The rs118594078 variant is a specific genetic change located within the COL17A1 gene. It is currently being studied for its potential associations with structural skin integrity and susceptibility to photo-aging.
What each genotype means
Typical collagen structural profile
This genotype represents the most common sequence observed at this position in the COL17A1 gene. Research into this specific variant is currently limited, and there is no established evidence that this sequence significantly alters skin integrity or photo-aging susceptibility compared to the general population.
This is the most frequent genotype observed across global populations in the gnomAD database.
Variant carrier status
You carry one copy of the less common allele at this position. Because this variant is rare, current scientific literature provides limited data on whether this specific change impacts collagen XVII function or skin-related phenotypes, and any associations remain uncertain.
This heterozygous genotype is rare, appearing in a very small fraction of individuals across most ancestral groups.
Rare variant profile
You carry two copies of the rare allele at this position. While the COL17A1 gene is known to be critical for skin basement membrane structure, the specific functional impact of this rare variant is not well-characterized in clinical research, and its association with photo-aging or skin integrity is currently considered limited.
This homozygous genotype is extremely rare and is observed in only a tiny subset of the global population.
Understanding the SNP and Its Location
The variant rs118594078 is a single nucleotide polymorphism (SNP) situated within the COL17A1 gene. This gene is located on chromosome 10 in the human genome. SNPs represent the most common type of genetic variation among people, where a single building block of DNA—a nucleotide—is replaced by another. In the context of genomics, identifying the precise location of a variant like rs118594078 helps researchers determine if the change occurs in a region that affects how a protein is built or how a gene is regulated. Because this variant is located within a gene responsible for structural proteins, scientists are interested in whether this specific change alters the function or stability of the resulting collagen protein, which is essential for maintaining the physical properties of human skin.
The Role of the COL17A1 Gene
The COL17A1 gene provides the instructions for creating the alpha 1 chain of type XVII collagen. This protein is a critical component of hemidesmosomes, which are specialized structures that anchor the outer layer of the skin (the epidermis) to the underlying layer (the dermis). By acting as a bridge between these layers, type XVII collagen ensures the structural integrity and cohesion of the skin. Research has shown that this protein is highly expressed in interfollicular epidermal stem cell niches, where it plays a vital role in maintaining the regenerative capacity of keratinocytes. When the expression of this collagen is reduced—whether through natural aging, UV exposure, or genetic factors—it can lead to a thinner epidermis and a weakened dermal-epidermal junction, which are hallmarks of skin aging.
Research Associations and Evidence Strength
Current research into rs118594078 is categorized as having limited evidence regarding its clinical impact. While the broader COL17A1 gene is well-documented for its role in skin health and conditions like epidermolysis bullosa, specific associations between the rs118594078 variant and photo-aging phenotypes are still being explored. Genome-wide association studies (GWAS) often identify many variants that may contribute to complex traits like skin wrinkling or sagging, but these findings require replication across diverse populations to confirm their significance. At this stage, the link between this specific SNP and skin aging is considered a subject of ongoing investigation rather than a definitive diagnostic marker. It is important to note that skin aging is a multifactorial process influenced by both genetics and significant environmental factors, such as cumulative ultraviolet radiation exposure.
Population Frequency
According to data from gnomAD v4, the rs118594078 variant is classified as rare. Rare variants are those that appear at a very low frequency within the general population. Because this variant is not common, it is difficult for researchers to gather large enough sample sizes to perform robust statistical analyses on its specific phenotypic effects. The rarity of this variant also means that its distribution may vary significantly across different ancestral groups. As genomic databases continue to expand and include more diverse populations, our understanding of how frequently this variant occurs and whether its effects are consistent across different genetic backgrounds will likely improve. Currently, the limited frequency data underscores the need for caution when interpreting the potential impact of this variant on an individual level.
Interpreting Your Genetic Information
If you have information about your genotype for rs118594078, it is important to view it within the context of current scientific limitations. Because the evidence linking this specific variant to skin health is limited, it cannot be used to predict your personal susceptibility to photo-aging or to guide medical decisions. Genetic variants are only one piece of a much larger puzzle that includes lifestyle, environment, and other genetic factors. You cannot change your genotype, but you can manage skin health through established practices such as sun protection, proper hydration, and regular consultations with a dermatologist. Always treat genetic information as educational rather than diagnostic. If you have concerns about your skin health or specific dermatological conditions, please discuss them with a qualified healthcare professional who can provide personalized advice based on your clinical history.
How common is this variant?
The rs118594078 variant is considered rare across most populations according to gnomAD v4 data.
Frequently asked questions
What is the COL17A1 gene?
COL17A1 is a gene that provides instructions for making type XVII collagen, a protein essential for anchoring the layers of the skin together. It plays a key role in maintaining skin structure and supporting the regenerative capacity of skin cells.
Can this SNP predict if I will get wrinkles?
No, this SNP cannot predict if you will develop wrinkles. Skin aging is a complex process influenced by many genes, environmental factors like sun exposure, and lifestyle choices, and the evidence for this specific variant is currently limited.
Is rs118594078 associated with skin cancer?
While some variants in collagen genes are studied in the context of skin health, there is no established evidence linking rs118594078 directly to skin cancer. Always consult a dermatologist for concerns regarding skin lesions or cancer risk.
What should I do if I have the rare genotype?
Because the evidence for this variant is limited, having a rare genotype does not necessarily indicate a health risk. You should continue to follow standard dermatological advice, such as using sunscreen and monitoring your skin for changes, regardless of your genetic results.
Sources & further reading
Educational information only, last refreshed 9/22/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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