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1.	Gudjonsdottir, Audur, 1959, et al. (author) Association Between Genotypes and Phenotypes in Coeliac Disease. 2009 In: Journal of pediatric gastroenterology and nutrition. - 1536-4801 .- 0277-2116. ; 49:2, s. 165-169 Journal article (peer-reviewed)abstract BACKGROUND:: Coeliac disease (CD) is a genetically driven immunological intolerance to dietary gluten with a wide range of clinical presentations. The aim of this study was to investigate the heritability of the phenotype in CD and the influence on the phenotype of different genes associated with the disease. PATIENTS AND METHODS:: One hundred and seven families with at least 2 siblings with CD were collected. The patients were grouped in symptom grades on the basis of the clinical presentation, the age at diagnosis, and sex. Stratification analyses of the human leucocyte antigen-DQA1 and human leucocyte antigen-DQB1 genotypes, the CTLA4 +49A/G polymorphism, the CTLA4 haplotype MH30G:-1147T:+49A:CT60G:CT61*A and the 5q31-33 loci were done. RESULTS:: The heritability of the phenotype was estimated to be 0.45. Significant association and linkage was found between the clinical presentation and the CTLA4 +49A/G polymorphism but not for the other genotypes. No correlation was found between genotypes and age at diagnosis or sex. CONCLUSIONS:: Our results indicate that the heritability is determiner of the phenotype in CD. The CTLA4 +49A/G polymorphism is correlated to the clinical presentation: the AA genotype is associated with clinically silent disease.

Gudjonsdottir, Audur, 1959, et al. (author)
Association Between Genotypes and Phenotypes in Coeliac Disease.
2009
In: Journal of pediatric gastroenterology and nutrition. - 1536-4801 .- 0277-2116. ; 49:2, s. 165-169
Journal article (peer-reviewed)abstract
- BACKGROUND:: Coeliac disease (CD) is a genetically driven immunological intolerance to dietary gluten with a wide range of clinical presentations. The aim of this study was to investigate the heritability of the phenotype in CD and the influence on the phenotype of different genes associated with the disease. PATIENTS AND METHODS:: One hundred and seven families with at least 2 siblings with CD were collected. The patients were grouped in symptom grades on the basis of the clinical presentation, the age at diagnosis, and sex. Stratification analyses of the human leucocyte antigen-DQA1 and human leucocyte antigen-DQB1 genotypes, the CTLA4 +49A/G polymorphism, the CTLA4 haplotype MH30*G:-1147*T:+49*A:CT60*G:CT61*A and the 5q31-33 loci were done. RESULTS:: The heritability of the phenotype was estimated to be 0.45. Significant association and linkage was found between the clinical presentation and the CTLA4 +49A/G polymorphism but not for the other genotypes. No correlation was found between genotypes and age at diagnosis or sex. CONCLUSIONS:: Our results indicate that the heritability is determiner of the phenotype in CD. The CTLA4 +49A/G polymorphism is correlated to the clinical presentation: the AA genotype is associated with clinically silent disease.

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