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The prevalence of allergic diseases is high globally, but especially in developed countries, with one in five to one in four individuals affected worldwide. The World Health Organization's "Allergic Rhinitis and its Impact on Asthma 2008 Update" guidelines stated explicitly that over 600 million patients from all countries, all ethnic groups and all ages suffer from allergic rhinitis (AR). There are clear evidences to support the concept that allergic diseases are influenced by genetic predisposition and environmental factors. The genetic basis of AR has been evaluated more intensively in the recent 10-20 years. Advances in technology and statistical methods, such as genome-wide association studies (GWAS) have enabled millions of single nucleotide polymorphisms (SNPs) to be genotyped at rapid pace and for less cost. However these studies have not yet answered the entire heritability profile of the disease. Additionally, environmental influences on these genetic variants cannot be discounted. Hence these allergic diseases must be evaluated as a complex interplay between genetic and environmental factors. This review focuses on the genetic basis of AR, with special emphasis on studies performed in Singapore. Candidate gene based studies and GWAS performed in Singapore cohorts have been discussed to suggest how these diseases could be understood better in a Singapore context which is still applicable to research in AR globally.

Genetic predisposition for atopy and allergic rhinitis in the Singapore Chinese population