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2015 ; 9
(ä): 26
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Integrative DNA methylation and gene expression analysis to assess the
universality of the CpG island methylator phenotype
#MMPMID26463173
Moarii M
; Reyal F
; Vert JP
Hum Genomics
2015[Oct]; 9
(ä): 26
PMID26463173
show ga
BACKGROUND: The CpG island methylator phenotype (CIMP) was first characterized in
colorectal cancer but since has been extensively studied in several other tumor
types such as breast, bladder, lung, and gastric. CIMP is of clinical importance
as it has been reported to be associated with prognosis or response to treatment.
However, the identification of a universal molecular basis to define CIMP across
tumors has remained elusive. RESULTS: We perform a genome-wide methylation
analysis of over 2000 tumor samples from 5 cancer sites to assess the existence
of a CIMP with common molecular basis across cancers. We then show that the CIMP
phenotype is associated with specific gene expression variations. However, we do
not find a common genetic signature in all tissues associated with CIMP.
CONCLUSION: Our results suggest the existence of a universal epigenetic and
transcriptomic signature that defines the CIMP across several tumor types but
does not indicate the existence of a common genetic signature of CIMP.