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2016 ; 8
(ä): 30
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Genome-wide analysis of DNA methylation and gene expression defines molecular
characteristics of Crohn s disease-associated fibrosis
#MMPMID26973718
Sadler T
; Bhasin JM
; Xu Y
; Barnholz-Sloan J
; Chen Y
; Ting AH
; Stylianou E
Clin Epigenetics
2016[]; 8
(ä): 30
PMID26973718
show ga
BACKGROUND: Fibrosis of the intestine is a common and poorly understood
complication of Crohn's disease (CD) characterized by excessive deposition of
extracellular matrix and accompanied by narrowing and obstruction of the gut
lumen. Defining the molecular characteristics of this fibrotic disorder is a
vital step in the development of specific prediction, prevention, and treatment
strategies. Previous epigenetic studies indicate that alterations in DNA
methylation could explain the mechanism by which mesenchymal cells adopt the
requisite pro-fibrotic phenotype that promotes fibrosis progression. However, to
date, genome-wide analysis of the DNA methylome of any type of human fibrosis is
lacking. We employed an unbiased approach using deep sequencing to define the DNA
methylome and transcriptome of purified fibrotic human intestinal fibroblasts
(HIF) from the colons of patients with fibrostenotic CD. RESULTS: When compared
with normal fibroblasts, we found that the majority of differential DNA
methylation was within introns and intergenic regions and not associated with CpG
islands. Only a low percentage occurred in the promoters and exons of genes.
Integration of the DNA methylome and transcriptome identified regions in three
genes that inversely correlated with gene expression: wingless-type mouse mammary
tumor virus integration site family, member 2B (WNT2B) and two eicosanoid
synthesis pathway enzymes (prostacyclin synthase and prostaglandin D2 synthase).
These findings were independently validated by RT-PCR and bisulfite sequencing.
Network analysis of the data also identified candidate molecular interactions
relevant to fibrosis pathology. CONCLUSIONS: Our definition of a genome-wide
fibrosis-specific DNA methylome provides new gene networks and epigenetic states
by which to understand mechanisms of pathological gene expression that lead to
fibrosis. Our data also provide a basis for development of new fibrosis-specific
therapies, as genes dysregulated in fibrotic Crohn's disease, following
functional validation, can serve as new therapeutic targets.