Uniformly curated signaling pathways reveal tissue-specific cross-talks and support drug target discovery

TL;DR

This paper introduces SignaLink, a curated database of signaling pathways across species, enabling detailed cross-talk and tissue-specific analysis to aid drug target discovery.

Contribution

The paper presents a uniformly curated, multi-species signaling pathway database that facilitates comparative analysis and identification of drug targets based on pathway cross-talks.

Findings

Any two of the 8 pathways can cross-talk in humans.

Identified 327 proteins relevant for drug target discovery.

Found pathway-specific expression profiles across tissues.

Abstract

Motivation: Signaling pathways control a large variety of cellular processes. However, currently, even within the same database signaling pathways are often curated at different levels of detail. This makes comparative and cross-talk analyses difficult. Results: We present SignaLink, a database containing 8 major signaling pathways from Caenorhabditis elegans, Drosophila melanogaster, and humans. Based on 170 review and approx. 800 research articles, we have compiled pathways with semi-automatic searches and uniform, well-documented curation rules. We found that in humans any two of the 8 pathways can cross-talk. We quantified the possible tissue- and cancer-specific activity of cross-talks and found pathway-specific expression profiles. In addition, we identified 327 proteins relevant for drug target discovery. Conclusions: We provide a novel resource for comparative and cross-talk analyses of signaling pathways. The identified multi-pathway and tissue-specific cross-talks contribute to the understanding of the signaling complexity in health and disease and underscore its importance in network-based drug target selection. Availability: http://SignaLink.org