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2016 ; 7
(41
): 67612-67625
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Gene-gene interactions in gastrointestinal cancer susceptibility
#MMPMID27588484
Kim J
; Yum S
; Kang C
; Kang SJ
Oncotarget
2016[Oct]; 7
(41
): 67612-67625
PMID27588484
show ga
Cancer arises from complex, multi-layer interactions between diverse genetic and
environmental factors. Genetic studies have identified multiple loci associated
with tumor susceptibility. However, little is known about how germline
polymorphisms interact with one another and with somatic mutations within a tumor
to mediate acquisition of cancer traits. Here, we survey recent studies showing
gene-gene interactions, also known as epistases, affecting genetic susceptibility
in colorectal, gastric and esophageal cancers. We also catalog epistasis types
and cancer hallmarks with respect to the interacting genes. A total of 22 gene
variation pairs displayed all levels of statistical epistasis, including
synergistic, redundant, suppressive and co-suppressive interactions. Five genes
primarily involved in base excision repair formed a linear topology in the
interaction network, MUTYH-OGG1-XRCC1-PARP1-MMP2, and three genes in mTOR
cell-proliferation pathway formed another linear network, PRKAG2-RPS6KB1-PIK3CA.
Discrete pairwise epistasis was also found in nucleotide excision repair,
detoxification, proliferation, TP53, TGF-? and other pathways. We propose that
three modes of biological interaction underlie the molecular mechanisms for
statistical epistasis. The direct binding, linear pathway and convergence modes
can exhibit any level of statistical epistasis in susceptibility to
gastrointestinal cancers, and this is likely true for other complex diseases as
well. This review highlights the link between cancer hallmarks and susceptibility
genes.