The study, published in the journal Nature Immunology, found that a type of antibody called immunoglobulin E (IgE) evolved from an ancestral antibody that was used by early primates to fight off parasitic infections. However, over time, this antibody began to react to harmless substances in the environment, such as pollen and dust, leading to the development of allergies.
"Our findings suggest that the evolution of allergies may have been a consequence of the evolution of our immune system," said study author Dr. James Lee, a professor of immunology at the University of Cambridge.
IgE antibodies are produced by the immune system in response to allergens, which are substances that trigger an allergic reaction. When an allergen binds to an IgE antibody, it causes the release of histamine and other inflammatory chemicals, which can lead to symptoms such as sneezing, runny nose, and watery eyes.
The study found that the ancestral antibody that gave rise to IgE was originally used by primates to fight off parasites. However, over time, this antibody began to lose its ability to recognize parasites and instead started to react to harmless substances in the environment. This led to the development of allergies, which are now a common problem in humans.
"Our study provides new insights into the evolution of the immune system and how it has shaped the development of allergies in humans," said Dr. Lee. "This knowledge could help us to develop new treatments for allergies and other immune-mediated diseases."
