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Genetic architecture differences between pediatric and adult-onset inflammatory bowel diseases in the Polish population.


ABSTRACT: Most inflammatory bowel diseases (IBDs) are classic complex disorders represented by common alleles. Here we aimed to define the genetic architecture of pediatric and adult-onset IBDs for the Polish population. A total of 1495 patients were recruited, including 761 patients with Crohn's disease (CD; 424 pediatric), 734 patients with ulcerative colitis (UC; 390 pediatric), and 934 healthy controls. Allelotyping employed a pooled-DNA genome-wide association study (GWAS) and was validated by individual genotyping. Whole exome sequencing (WES) was performed on 44 IBD patients diagnosed before 6 years of age, 45 patients diagnosed after 40 years of age, and 18 healthy controls. Altogether, out of 88 selected SNPs, 31 SNPs were replicated for association with IBD. A novel BRD2 (rs1049526) association reached significance of P?=?5.2?×?10-11 and odds ratio (OR)?=?2.43. Twenty SNPs were shared between pediatric and adult patients; 1 and 7 were unique to adult-onset and pediatric-onset IBD, respectively. WES identified numerous rare and potentially deleterious variants in IBD-associated or innate immunity-associated genes. Deleterious alleles in both groups were over-represented among rare variants in affected children. Our GWAS revealed differences in the polygenic architecture of pediatric- and adult-onset IBD. A significant accumulation of rare and deleterious variants in affected children suggests a contribution by yet unexplained genetic components.

SUBMITTER: Ostrowski J 

PROVIDER: S-EPMC5180213 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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Genetic architecture differences between pediatric and adult-onset inflammatory bowel diseases in the Polish population.

Ostrowski Jerzy J   Paziewska Agnieszka A   Lazowska Izabella I   Ambrozkiewicz Filip F   Goryca Krzysztof K   Kulecka Maria M   Rawa Tomasz T   Karczmarski Jakub J   Dabrowska Michalina M   Zeber-Lubecka Natalia N   Tomecki Roman R   Kluska Anna A   Balabas Aneta A   Piatkowska Magdalena M   Paczkowska Katarzyna K   Kierkus Jaroslaw J   Socha Piotr P   Lodyga Michal M   Rydzewska Grazyna G   Klopocka Maria M   Mierzwa Grazyna G   Iwanczak Barbara B   Krzesiek Elzbieta E   Bak-Drabik Katarzyna K   Walkowiak Jaroslaw J   Klincewicz Beata B   Radwan Piotr P   Grzybowska-Chlebowczyk Urszula U   Landowski Piotr P   Jankowska Agnieszka A   Korczowski Bartosz B   Starzynska Teresa T   Albrecht Piotr P   Mikula Michal M  

Scientific reports 20161223


Most inflammatory bowel diseases (IBDs) are classic complex disorders represented by common alleles. Here we aimed to define the genetic architecture of pediatric and adult-onset IBDs for the Polish population. A total of 1495 patients were recruited, including 761 patients with Crohn's disease (CD; 424 pediatric), 734 patients with ulcerative colitis (UC; 390 pediatric), and 934 healthy controls. Allelotyping employed a pooled-DNA genome-wide association study (GWAS) and was validated by indivi  ...[more]

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