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2015 ; 16
(ä): 200
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Multiobjective triclustering of time-series transcriptome data reveals key genes
of biological processes
#MMPMID26108437
Bhar A
; Haubrock M
; Mukhopadhyay A
; Wingender E
BMC Bioinformatics
2015[Jun]; 16
(ä): 200
PMID26108437
show ga
BACKGROUND: Exploratory analysis of multi-dimensional high-throughput datasets,
such as microarray gene expression time series, may be instrumental in
understanding the genetic programs underlying numerous biological processes. In
such datasets, variations in the gene expression profiles are usually observed
across replicates and time points. Thus mining the temporal expression patterns
in such multi-dimensional datasets may not only provide insights into the key
biological processes governing organs to grow and develop but also facilitate the
understanding of the underlying complex gene regulatory circuits. RESULTS: In
this work we have developed an evolutionary multi-objective optimization for our
previously introduced triclustering algorithm ?-TRIMAX. Its aim is to make
optimal use of ?-TRIMAX in extracting groups of co-expressed genes from time
series gene expression data, or from any 3D gene expression dataset, by adding
the powerful capabilities of an evolutionary algorithm to retrieve overlapping
triclusters. We have compared the performance of our newly developed algorithm,
EMOA- ?-TRIMAX, with that of other existing triclustering approaches using four
artificial dataset and three real-life datasets. Moreover, we have analyzed the
results of our algorithm on one of these real-life datasets monitoring the
differentiation of human induced pluripotent stem cells (hiPSC) into mature
cardiomyocytes. For each group of co-expressed genes belonging to one tricluster,
we identified key genes by computing their membership values within the
tricluster. It turned out that to a very high percentage, these key genes were
significantly enriched in Gene Ontology categories or KEGG pathways that fitted
very well to the biological context of cardiomyocytes differentiation.
CONCLUSIONS: EMOA- ?-TRIMAX has proven instrumental in identifying groups of
genes in transcriptomic data sets that represent the functional categories
constituting the biological process under study. The executable file can be found
at
http://www.bioinf.med.uni-goettingen.de/fileadmin/download/EMOA-delta-TRIMAX.tar.gz
.