Whole genome and exome sequencing of monozygotic twins discordant for Crohn's disease.

Abstract:

BACKGROUND:Crohn's disease (CD) is an inflammatory bowel disease caused by genetic and environmental factors. More than 160 susceptibility loci have been identified for IBD, yet a large part of the genetic variance remains unexplained. Recent studies have demonstrated genetic differences between monozygotic twins, who were long thought to be genetically completely identical. RESULTS:We aimed to test if somatic mutations play a role in CD etiology by sequencing the genomes and exomes of directly affected tissue from the bowel and blood samples of one and the blood-derived exomes of two further monozygotic discordant twin pairs. Our goal was the identification of mutations present only in the affected twins, pointing to novel candidates for CD susceptibility loci. We present a thorough genetic characterization of the sequenced individuals but detected no consistent differences within the twin pairs. An estimate of the CD susceptibility based on known CD loci however hinted at a higher mutational load in all three twin pairs compared to 1,920 healthy individuals. CONCLUSION:Somatic mosaicism does not seem to play a role in the discordance of monozygotic CD twins. Our study constitutes the first to perform whole genome sequencing for CD twins and therefore provides a valuable reference dataset for future studies. We present an example framework for mosaicism detection and point to the challenges in these types of analyses.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Petersen BS,Spehlmann ME,Raedler A,Stade B,Thomsen I,Rabionet R,Rosenstiel P,Schreiber S,Franke A

doi

10.1186/1471-2164-15-564

subject

Has Abstract

pub_date

2014-07-05 00:00:00

pages

564

issn

1471-2164

pii

1471-2164-15-564

journal_volume

15

pub_type

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