An international team of scientists led by Helmholtz Zentrum München and University of Copenhagen has presented the largest study so far on allergic rhinitis in the journal ‘Nature Genetics’. The data of nearly 900,000 participants revealed loci in the human genome whose changes significantly increase the risk of disease.
Allergic rhinitis, also known as hay fever, is the most common form of allergy. It is triggered by airborne allergens, including pollens, house dust mite and animal dander. Around 400 million people worldwide are affected by the disease, and the trend is rising, especially in westernized countries.
"In order to improve the prevention and treatment of this disease, we first need to understand why the body defends itself against certain, actually harmless substances," said Dr. Marie Standl, head of a research group at the Institute of Epidemiology at Helmholtz Zentrum München. She is the first author of the current study and significantly involved in the elaborate statistical evaluation of the data of nearly 900,000 test persons.
Dragnet search for risk genes
The aim of the study, which was performed within the framework of the EAGLE (EArly Genetics and Lifecourse Epidemiology) consortium, was to identify genetic differences between people with and without allergic rhinitis. For this purpose, the researchers performed a dragnet search for the respective risk genes and sequentially narrowed down the number of candidate genes:
In a first step, they compared the genome of around 60,000 patients with allergic rhinitis with that of over 150,000 healthy controls, revealing a pool of 42 significant risk genes, some of which had previously been described in the literature.
In a second step, 20 so far unknown risk genes could be confirmed on the basis of data from another 60,000 patients and 620,000 healthy controls. "The higher the number of study participants, the more reliable conclusions we can draw," said Standl, explaining the importance of the large amount of data. "The identified risk genes can explain about eight percent of all cases of allergic rhinitis."
The authors then used databases to investigate which functions could be assigned to these genes. In fact, most of these were known to have an association with the immune system, for example in the binding of antigens.* In addition, a strong overlap of risk genes for allergic rhinitis and autoimmune diseases was observed.
"The risk loci we have identified can help understanding the mechanisms causing allergic rhinitis and hopefully also to find targets for treatment and prevention" said Dr. Klaus Bønnelykke, who directed the study together with co-authors Johannes Waage and Hans Bisgaard from COPSAC (Copenhagen Prospective Studies on Asthma in Childhood), University of Copenhagen. "Still, the genes we identified only partly explain why so many people develop allergic rhinitis. One important next step is to understand how risk genes interact with our environment.”
* Some of these genetic variants led to the changes of amino acids in the HLA region, which is relevant for the binding of allergens.
Just recently, Helmholtz Zentrum München and University of Copenhagen entered into a strategic alliance in the fight against diabetes: https://www.helmholtz-muenchen.de/en/press-media/press-releases/all-press-releas...
The Helmholtz Zentrum München, the German Research Center for Environmental Health, pursues the goal of developing personalized medical approaches for the prevention and therapy of major common diseases such as diabetes and lung diseases. To achieve this, it investigates the interaction of genetics, environmental factors and lifestyle. The Helmholtz Zentrum München is headquartered in Neuherberg in the north of Munich and has about 2,300 staff members. It is a member of the Helmholtz Association, a community of 18 scientific-technical and medical-biological research centers with a total of about 37,000 staff members. http://www.helmholtz-muenchen.de/en
The Institute of Epidemiology (EPI) assesses genetic, environmental and lifestyle risk factors which jointly determine the occurrence of major chronic diseases. The focus is on the development and progression of metabolic, respiratory and allergic diseases, as well as heart diseases and mental health. The goal is to understand the molecular underpinning of disease better and to translate this knowledge into personalized approaches of prevention as well as polices to improve health. Research builds on the unique resources of the KORA cohort, the KORA myocardial infarction registry, and the KORA aerosol measurement station. Aging-related phenotypes have been added to the KORA research portfolio within the frame of the Research Consortium KORA-Age. Moreover, the institute makes use of the birth cohorts GINI and LISA. It plays a leading role in the planning and setting up of the German National Cohort and builds the NAKO biorepository. http://www.helmholtz-muenchen.de/epi
Contact for the media:
Department of Communication, Helmholtz Zentrum München – German Research Center for Environmental Health (GmbH), Ingolstädter Landstr. 1, 85764 Neuherberg - Phone: +49 89 3187 2238 - E-mail: email@example.com
Dr. Marie Standl, Helmholtz Zentrum München - German Research Center for Environmental Health (GmbH), Institute of Epidemiology, Ingolstädter Landstr. 1, 85764 Neuherberg – Phone: +49 89 3187 2952 - E-mail: firstname.lastname@example.org
Waage, J. & Standl, M. et al. (2018): Genome-wide association and HLA fine-mapping studies identify risk loci and genetic pathways underlying allergic rhinitis. Nature Genetics, DOI: 10.1038/s41588-018-0157-1
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