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2016 ; 6
(ä): 28720
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A new strategy for exploring the hierarchical structure of cancers by adaptively
partitioning functional modules from gene expression network
#MMPMID27349736
Xu J
; Jing R
; Liu Y
; Dong Y
; Wen Z
; Li M
Sci Rep
2016[Jun]; 6
(ä): 28720
PMID27349736
show ga
The interactions among the genes within a disease are helpful for better
understanding the hierarchical structure of the complex biological system of it.
Most of the current methodologies need the information of known interactions
between genes or proteins to create the network connections. However, these
methods meet the limitations in clinical cancer researches because different
cancers not only share the common interactions among the genes but also own their
specific interactions distinguished from each other. Moreover, it is still
difficult to decide the boundaries of the sub-networks. Therefore, we proposed a
strategy to construct a gene network by using the sparse inverse covariance
matrix of gene expression data, and divide it into a series of functional modules
by an adaptive partition algorithm. The strategy was validated by using the
microarray data of three cancers and the RNA-sequencing data of glioblastoma. The
different modules in the network exhibited specific functions in cancers
progression. Moreover, based on the gene expression profiles in the modules, the
risk of death was well predicted in the clustering analysis and the binary
classification, indicating that our strategy can be benefit for investigating the
cancer mechanisms and promoting the clinical applications of network-based
methodologies in cancer researches.