FLG rs112111458: Understanding the 2282del4 Skin Barrier Variant
The rs112111458 variant, commonly known as 2282del4, is a loss-of-function mutation in the FLG gene. It is associated with impaired skin barrier integrity and an increased predisposition to atopic dermatitis.
What each genotype means
Typical skin barrier function
This genotype represents the common, functional version of the filaggrin gene. Individuals with this profile do not carry the specific 2282del4 loss-of-function mutation associated with increased risk for atopic dermatitis and impaired skin barrier integrity.
This is the most common genotype in all populations, as the 2282del4 variant is relatively rare.
Increased atopic dermatitis risk
Carrying one copy of this variant, often referred to as 2282del4, is associated with a reduced ability to produce functional filaggrin protein, which is essential for maintaining the skin's protective barrier. Research indicates that individuals with this genotype have a higher statistical predisposition to developing atopic dermatitis and may be more susceptible to food allergen sensitization. This is a complex trait, and the presence of this variant does not guarantee the development of any condition.
This genotype is found in approximately 1% to 2% of individuals of European ancestry and is significantly rarer in other global populations.
Elevated skin barrier risk
Carrying two copies of this loss-of-function variant results in a more significant reduction of filaggrin protein production compared to those with one copy. This genotype is strongly linked to ichthyosis vulgaris and a higher risk for severe atopic dermatitis and related allergic conditions. If you have concerns about skin health or allergic symptoms, please discuss these findings with a dermatologist or healthcare provider.
This homozygous genotype is very rare, occurring in a small fraction of the population even within European groups where the variant is most prevalent.
What is the rs112111458 Variant?
The rs112111458 variant is a specific genetic alteration located within the FLG gene, which resides on chromosome 1q21. In scientific literature, this variant is frequently referred to as 2282del4, indicating a deletion of four nucleotides in the DNA sequence. This type of mutation is classified as a loss-of-function variant because it disrupts the normal reading frame of the gene, typically leading to a truncated or non-functional protein product. Because the FLG gene provides instructions for creating a protein essential for skin structure, this deletion can significantly impact how the skin forms its protective outer layer. Researchers track this specific SNP to understand how variations in the genetic code contribute to differences in skin barrier function across individuals.
The Role of the FLG Gene
The FLG gene encodes for filaggrin, a protein that plays a critical role in the terminal differentiation of keratinocytes, the primary cells of the epidermis. Filaggrin acts as a structural scaffold, helping to aggregate keratin filaments and maintain the integrity of the stratum corneum, the outermost layer of the skin. Beyond its structural role, filaggrin is broken down into natural moisturizing factors that help regulate skin hydration and pH levels. When the FLG gene is mutated, the resulting deficiency in filaggrin can lead to a compromised skin barrier. This impairment allows for increased transepidermal water loss and makes the skin more susceptible to environmental irritants, allergens, and pathogens, which are key factors in the development of various dermatological conditions.
Research Associations and Evidence
Research has consistently identified FLG loss-of-function variants, including 2282del4, as significant genetic risk factors for atopic dermatitis (AD). Studies, including meta-analyses, have estimated that individuals carrying these null mutations face a substantially higher risk of developing AD compared to those without them. The evidence is particularly strong for moderate-to-severe cases of the condition. Furthermore, some research suggests that this impaired barrier function may increase the likelihood of subsequent food allergen sensitization or the development of asthma in the context of atopic disease. However, it is important to note that while these variants are strong predisposing factors, they are not the sole cause of atopic dermatitis. Many individuals with the variant do not develop the condition, and many with the condition do not carry the variant, highlighting the complex interplay between genetics and environmental factors.
Population Frequency
The rs112111458 variant is primarily observed in populations of European descent, where it is estimated to be carried by approximately 1% of the population. It is considered rare in other global populations. Because the frequency of this variant varies significantly by ancestry, its contribution to the overall prevalence of atopic dermatitis can differ depending on the demographic group being studied. Geneticists use this data to better understand the evolutionary history of the variant and its specific impact on different ethnic groups.
Interpreting Your Genetic Information
Understanding your genetic status regarding the FLG gene can provide insight into your biological predisposition for skin barrier issues, but it is not a medical diagnosis. Genetic variants are only one piece of a much larger puzzle that includes environmental exposures, lifestyle, and other genetic factors. If you are concerned about skin health, allergies, or atopic dermatitis, it is essential to consult with a dermatologist or a qualified healthcare provider. They can evaluate your symptoms, medical history, and physical presentation to provide an accurate assessment. Never use genetic information to make decisions about medical treatments or to self-diagnose. Always discuss any health concerns or potential management strategies with a professional who can provide personalized guidance based on your specific clinical needs.
How common is this variant?
The rs112111458 variant has a minor allele frequency of approximately 0.01 in European populations and is considered rare in other global populations.
Frequently asked questions
Does having the FLG mutation mean I will get eczema?
No, having an FLG mutation does not guarantee that you will develop atopic dermatitis (eczema). It is a risk factor, meaning it increases the likelihood, but many other genetic and environmental factors contribute to the development of the condition.
Can I fix my FLG mutation?
Genetic variants are permanent parts of your DNA and cannot be 'fixed' or changed. However, dermatologists can recommend skincare routines and treatments that help support the skin barrier and manage symptoms associated with filaggrin deficiency.
Is this variant related to food allergies?
Some research suggests that individuals with FLG loss-of-function variants may have a higher likelihood of food allergen sensitization due to a compromised skin barrier. This is an area of ongoing research, and you should discuss any allergy concerns with an immunologist.
Should I get tested for this variant?
Routine genetic testing for this variant is not typically recommended for the general public. If you have concerns about chronic skin conditions, it is best to see a dermatologist who can assess your skin health clinically.
Sources & further reading
Educational information only, last refreshed 9/15/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Filaggrin missense and splice-region variant associated with skin barrier disruption, atopic dermatitis, and allergic sensitization.
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A filaggrin locus variant associated with impaired epidermal barrier function, predisposing to atopic dermatitis and allergic sensitization.