Is Anaphylaxis Hidden in Your DNA? Find Out How Genetics Influence Risk

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Studies have shown that certain genetic factors can make individuals more susceptible to severe allergies and allergic reactions like anaphylaxis. Allergy-related genes, such as FCER1A, IL-4, HLA-DQB1, TSLP, and CD14, have been associated with hypersensitivity, allergic diseases, and anaphylaxis. The role of genetics in anaphylaxis risk is influenced by family history of allergies, epigenetics, and genetic variations in allergy-related genes.

The Role of Genetics and Allergy-Related Genes in Anaphylaxis Risk

Environmental triggers, such as medications, insect stings, or foods, directly influence someone’s susceptibility and the severity of their allergic reaction. Genetic factors, such as immune system regulation genes, inflammatory response genes, and epigenetic modifiers, can also significantly increase one’s likelihood of anaphylaxis.

Epigenetics highlights how environmental elements can manipulate genetics, influencing allergy development and anaphylaxis risk. Individuals who have one or both parents with severe allergies have a genetic predisposition to severe allergic reactions and anaphylaxis.

Immune System Regulation Genes and Allergic Reactions

Variations in immune system genes, including FCER1A, IL-4, IL-13, and HLA-DQB1, can make individuals more susceptible to severe allergic reactions like anaphylaxis. The FCER1A gene conceals the high-affinity receptor for Immunoglobulin E (IgE), an antibody central to allergic reactions and other immune responses.

IgE mediates the release of histamines and other inflammatory molecules that lead to anaphylactic reactions. Variations in the FCER1A gene can result in hypersensitivity and an increased risk of anaphylaxis when exposed to an allergen.

IL-4 and IL-13 genes are cytokines responsible for immune response signaling and allergic diseases. Genetic polymorphisms in IL13 and IL4 are associated with raised IgE levels, increasing anaphylaxis risk. HLA-DBQ1 is part of the human leukocyte antigen (HLA) complex that helps the immune system identify allergens. Specific HLA variants have been linked with an increased susceptibility to food allergies and anaphylaxis.

Inflammatory Response Genes

Thymic Stromal Lymphopoietin (TSLP) is a gene that regulates immune responses through epithelial cells. Research indicates that TSLP promotes T helper (Th) 2 immune responses, which are associated with allergic inflammatory diseases and reactions. Mutations in the TSLP gene have been linked to allergic diseases like asthma, which can co-occur with anaphylaxis.

CD14 gene influences the immune system’s response to environmental allergens like food or medications. Variations in CD14 may increase someone’s sensitivity to allergens when exposed, raising the risk of systemic allergic reactions.

Epigenetics and Environmental Interactions

Epigenetics is the study of how external factors influence gene expression. Environmental exposures can change the expression of allergy-related genes without altering the underlying DNA sequence. Epigenetic modifiers, such as exposure to pollutants, early-life infections, or smoke, can activate allergy-related pathways that lead to the overproduction of IgE.

An overflow of IgE can influence anaphylaxis risk by triggering allergy symptoms in the lungs, throat, nose, and skin. If a mother is exposed to allergens or pollutants during pregnancy, it can affect the child’s immune system development. Epigenetic factors like diet, infections, and allergen exposure can also modify gene activity and increase the possibility of hypersensitivity reactions.

Family History and Risk Factors for Anaphylaxis

Individuals with a family history of allergies and severe allergic reactions suggest a genetic predisposition to anaphylaxis. Allergies and anaphylaxis are often hereditary, especially if one or both parents have them.

Research shows that heritability for allergies and severe allergic reactions can range from 40% to 80%. Individuals with inherited differences in copies of TPSAB1 make extra a-tryptase, resulting in an increased risk of experiencing severe anaphylaxis. If parents have allergies or severe allergic reactions, their children are likelier to develop allergies and experience anaphylactic reactions.

How Genetic Variations Affect Anaphylaxis Risk

Genetic variations in the immune system and inflammatory response genes can contribute to an individual’s risk of anaphylaxis. Genetic predispositions in IgE-related pathways like FCER1A can prompt the immune system to associate harmless substances like foods or medications as threats, ultimately triggering anaphylactic reactions.

Variants in IL4 and IL13 can trigger severe systemic responses and inflammation to allergens, exacerbating the effects of anaphylaxis.

Preventing and Managing Anaphylaxis for At-Risk Individuals

With advances in anaphylaxis research, allergy testing, and genetic studies, individuals can assess their potential predisposition to developing allergies and anaphylaxis. Identifying your potential risk for severe allergies and anaphylaxis can help you minimize triggers and prepare for emergencies.

If severe allergic reactions run in your family, taking precautions and educating yourself on different allergens and anaphylaxis symptoms is essential.

Understanding the Severity of Anaphylactic Reactions

Anaphylaxis is a severe and potentially life-threatening allergic reaction that can be triggered by foods, insect stings, medications, and latex. The symptoms of anaphylaxis can include:

  • Hives
  • Swelling in the throat, lips, and tongue
  • Trouble breathing
  • Difficulty swallowing
  • Itchy, watery eyes
  • Stomach pain
  • Nausea and vomiting
  • Wheezing

Anaphylaxis signs and symptoms can occur within minutes of exposure to an allergen. Understanding your allergens and the severity of anaphylaxis can ensure you avoid potential triggers and remain prepared in case of exposure.

Avoiding Anaphylaxis Triggers

Anaphylaxis triggers include food allergens, insect bites and stings, certain drugs and medications, and latex. The most common food allergens are peanuts, tree nuts, soy, sesame, wheat, shellfish, fish, cow’s milk, and eggs.

Certain medications and over-the-counter (OTC) drugs, such as penicillins, nonsteroidal anti-inflammatory drugs (NSAIDs), and amoxicillin, can trigger an anaphylactic reaction. Insect stings and bites from bees, wasps, and ants commonly cause anaphylaxis. Identifying your specific allergies or sensitivities can help minimize exposure to them in particular environments and situations.

Emergency Preparedness

Emergency preparedness is life-dependent for individuals at risk of anaphylaxis. Always carry two epinephrine auto-injectors, a life-saving medication for anaphylaxis, in case of exposure to an allergen. During an anaphylactic reaction, medical alert devices, such as bracelets, apps, or notes, provide essential information for emergency medical technicians (EMTs) and other healthcare providers.

Spreading Food Allergy and Anaphylaxis Awareness

The KeepSmilin4Abbie Foundation was founded in 2014 in memory of Abbie Benford, who lost her life to an anaphylactic reaction. Our foundation funds research to detect the early signs of anaphylaxis to enable early intervention to save millions like Abbie at risk of sudden death.

You can join us in the fight to #StopAnaphylaxis and donate today.

 

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