FLG rs61814899: Understanding This Skin Barrier Variant
The rs61814899 variant is a loss-of-function mutation in the FLG gene, which provides instructions for making the protein filaggrin. This variant is associated with an increased predisposition to atopic dermatitis (eczema) and certain food allergies due to its impact on skin barrier integrity.
What each genotype means
Typical skin barrier function
You carry two copies of the common, functional reference allele for this filaggrin variant. This genotype is not associated with the increased risk of skin barrier disruption, early-onset eczema, or allergic sensitization linked to the loss-of-function mutation. However, overall risk for atopic conditions is multifactorial and depends on other genetic and environmental factors.
Carried by approximately 96% to 97% of individuals of European ancestry and more than 99% of individuals in most non-European populations.
Increased eczema and allergy susceptibility
You carry one copy of the loss-of-function stop-gain mutation (historically referred to as R501X or c.1501A>T). In published studies, carrying one null allele significantly impairs the epidermal barrier, conferring a higher statistical risk for atopic dermatitis, earlier age of disease onset, and elevated risk of allergic sensitization and food allergies. This result is an indicator of statistical predisposition and is not a clinical diagnosis of eczema.
Found in roughly 3% to 4% of individuals of European ancestry; it is exceedingly rare or absent in African and East Asian populations.
Marked skin barrier impairment
You carry two copies of the loss-of-function mutation, resulting in a substantial deficiency of the filaggrin protein in the outer layer of the skin. Research associates biallelic loss-of-function variants with a pronounced genetic predisposition to severe, early-onset atopic dermatitis and ichthyosis vulgaris. This genetic finding indicates a significant barrier defect but requires clinical evaluation for diagnostic interpretation.
Extremely rare across all global populations, occurring in fewer than 1 in 2,500 individuals of European descent.
What is the rs61814899 Variant?
The rs61814899 variant, also known as p.Lys501Ter, is a specific genetic change located within the FLG gene. In genetics, a loss-of-function variant like this typically introduces a premature stop codon, which signals the cell to stop building the protein before it is complete. This results in a truncated, often non-functional version of the filaggrin protein. Because this variant alters the protein's structure, it is categorized as a genetic risk factor rather than a direct cause of disease. It sits within the epidermal differentiation complex on chromosome 1, a region critical for skin development. Researchers track this specific SNP to understand how variations in the genetic code contribute to the structural differences in the skin barrier observed across different individuals.
The Role of the FLG Gene
The FLG gene encodes filaggrin, a protein that plays a vital role in the formation and maintenance of the skin barrier. Filaggrin acts like a glue that helps hold skin cells together and is essential for maintaining the skin's hydration and protecting it from environmental irritants, allergens, and pathogens. When the FLG gene is functioning correctly, it ensures the outer layer of the skin remains a robust, effective shield. However, when loss-of-function variants occur, the production of functional filaggrin is reduced or absent. This deficiency leads to a compromised skin barrier, which can result in increased transepidermal water loss and a higher susceptibility to substances penetrating the skin, potentially triggering immune responses that manifest as eczema or allergic conditions.
Research and Clinical Associations
Scientific research has consistently identified FLG loss-of-function variants as significant genetic risk factors for atopic dermatitis, commonly known as eczema. Studies indicate that individuals carrying these variants are more likely to experience dry, itchy skin and red rashes. Beyond eczema, there is evidence suggesting an association with an increased risk of food allergies, particularly in early childhood. It is important to note that the evidence strength for this specific variant is considered limited in some contexts, and the presence of the variant does not guarantee the development of these conditions. Many people with these variants never develop severe symptoms, while others without the variants may still experience eczema. The relationship between genetics and skin health is complex, involving a combination of genetic predisposition, environmental triggers, and immune system interactions.
Population Frequency
The rs61814899 variant is found primarily in European populations, with a minor allele frequency typically reported between 0.015 and 0.02 in databases like gnomAD. This means that while it is not extremely rare, it is not present in the majority of the population. Carrier frequencies can vary significantly depending on ancestral background, and researchers continue to study how these frequencies shift across diverse global populations. Because this variant is relatively uncommon, most individuals will not carry it, but for those who do, it represents a known genetic marker for skin barrier sensitivity.
What This Information Means for You
Learning about a genetic variant like rs61814899 can provide insight into your biological predispositions, but it is not a medical diagnosis. Genetic information is only one piece of a much larger puzzle that includes your environment, lifestyle, and overall health history. If you are concerned about skin conditions, allergies, or the health of your skin barrier, the most effective approach is to consult with a dermatologist or a primary care physician. They can evaluate your symptoms, provide a clinical assessment, and recommend appropriate skincare or management strategies. Do not use genetic data to make decisions about medical treatments or to self-diagnose. Always discuss any health concerns or findings from genetic testing with a qualified healthcare professional who can interpret the results in the context of your personal health.
How common is this variant?
The rs61814899 variant has a minor allele frequency of approximately 0.015 to 0.02 in European populations according to gnomAD data.
Frequently asked questions
Does having the rs61814899 variant mean I will get eczema?
No, having this variant does not guarantee you will develop eczema. It is a risk factor, meaning it increases the likelihood of developing the condition, but many other genetic and environmental factors contribute to whether or not someone actually develops symptoms.
Can I fix my FLG gene if I have this variant?
Currently, there is no medical treatment to 'fix' or change a genetic variant in your DNA. Management focuses on supporting the skin barrier through moisturizers, avoiding known triggers, and working with a dermatologist to treat symptoms if they arise.
Is this variant related to peanut allergies?
Research has shown that FLG loss-of-function variants are associated with an increased risk of food allergies, including peanut allergy. This is thought to be due to the compromised skin barrier allowing allergens to enter the body through the skin, which can sensitize the immune system.
Should I get tested for this variant?
Genetic testing for this variant is generally not required for the diagnosis or management of eczema. If you are concerned about skin or allergy issues, a clinical evaluation by a doctor is more useful than genetic testing alone.
Sources & further reading
Educational information only, last refreshed 10/11/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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A well-characterized loss-of-function null mutation (2282del4) in filaggrin predisposing individuals to cutaneous allergen penetration and the atopic march.
Filaggrin missense and splice-region variant associated with skin barrier disruption, atopic dermatitis, and allergic sensitization.
Loss-of-function mutation 2282del4 in filaggrin predisposing to peanut allergy.
Filaggrin coding variant associated with skin barrier disruption and allergic conditions.
A filaggrin locus variant associated with impaired epidermal barrier function, predisposing to atopic dermatitis and allergic sensitization.
Skin barrier filaggrin risk-associated variant commonly implicated in the atopic march from severe infant atopic dermatitis to secondary food sensitization.