Is Atopic Dermatitis and Eczema hereditary?

Atopic dermatitis and eczema are considered complex, multifactorial conditions, meaning they are influenced by a combination of hereditary genetic factors and environmental triggers rather than being caused by a single gene mutation.

Understanding the Genetic Component

While atopic dermatitis and eczema have a strong hereditary component, they do not follow simple Mendelian inheritance patterns like autosomal dominant or recessive traits. Instead, the condition typically results from a polygenic predisposition—where multiple genes interact with environmental exposures. One of the most well-known genetic contributors involves mutations in the FLG gene, which provides instructions for making filaggrin, a protein essential for maintaining the skin's protective barrier. When this barrier is compromised, the skin becomes more susceptible to inflammation and allergens characteristic of atopic dermatitis and eczema.

Risk and Inheritance

Because the inheritance is multifactorial, it is difficult to provide a single percentage risk for children. However, clinical data suggests that if one parent has atopic dermatitis and eczema, the risk for a child is significantly higher than in the general population; if both parents are affected, that risk increases further. It is important to note that having the genetic predisposition does not guarantee the development of the disease, as environmental factors play a crucial role in disease expression.

Genetic Testing and Counseling

Genetic testing for atopic dermatitis and eczema is generally not recommended in clinical practice. Because the disease is so complex and influenced by many genes and external factors, a genetic test cannot accurately predict whether an individual will develop symptoms. De novo (spontaneous) mutations are not considered the primary driver of this condition. Genetic counseling is rarely used for diagnostic purposes but can be helpful for families who are concerned about the recurrence of atopic conditions or who wish to understand the interplay between genetics and skin health.

Disclaimer: This information is for educational purposes and does not constitute medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD)


• Orphanet: The portal for rare diseases and orphan drugs


• Online Mendelian Inheritance in Man (OMIM)