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2017 ; 5
(ä): e3509
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GeNNet: an integrated platform for unifying scientific workflows and graph
databases for transcriptome data analysis
#MMPMID28695067
Costa RL
; Gadelha L
; Ribeiro-Alves M
; Porto F
PeerJ
2017[]; 5
(ä): e3509
PMID28695067
show ga
There are many steps in analyzing transcriptome data, from the acquisition of raw
data to the selection of a subset of representative genes that explain a
scientific hypothesis. The data produced can be represented as networks of
interactions among genes and these may additionally be integrated with other
biological databases, such as Protein-Protein Interactions, transcription factors
and gene annotation. However, the results of these analyses remain fragmented,
imposing difficulties, either for posterior inspection of results, or for
meta-analysis by the incorporation of new related data. Integrating databases and
tools into scientific workflows, orchestrating their execution, and managing the
resulting data and its respective metadata are challenging tasks. Additionally, a
great amount of effort is equally required to run in-silico experiments to
structure and compose the information as needed for analysis. Different programs
may need to be applied and different files are produced during the experiment
cycle. In this context, the availability of a platform supporting experiment
execution is paramount. We present GeNNet, an integrated transcriptome analysis
platform that unifies scientific workflows with graph databases for selecting
relevant genes according to the evaluated biological systems. It includes
GeNNet-Wf, a scientific workflow that pre-loads biological data, pre-processes
raw microarray data and conducts a series of analyses including normalization,
differential expression inference, clusterization and gene set enrichment
analysis. A user-friendly web interface, GeNNet-Web, allows for setting
parameters, executing, and visualizing the results of GeNNet-Wf executions. To
demonstrate the features of GeNNet, we performed case studies with data retrieved
from GEO, particularly using a single-factor experiment in different analysis
scenarios. As a result, we obtained differentially expressed genes for which
biological functions were analyzed. The results are integrated into GeNNet-DB, a
database about genes, clusters, experiments and their properties and
relationships. The resulting graph database is explored with queries that
demonstrate the expressiveness of this data model for reasoning about gene
interaction networks. GeNNet is the first platform to integrate the analytical
process of transcriptome data with graph databases. It provides a comprehensive
set of tools that would otherwise be challenging for non-expert users to install
and use. Developers can add new functionality to components of GeNNet. The
derived data allows for testing previous hypotheses about an experiment and
exploring new ones through the interactive graph database environment. It enables
the analysis of different data on humans, rhesus, mice and rat coming from
Affymetrix platforms. GeNNet is available as an open source platform at
https://github.com/raquele/GeNNet and can be retrieved as a software container
with the command docker pull quelopes/gennet.